CHENGDU HUAYUAN NB-200 User manual

NB-200/250/315/350/500/630IGBT
Inverter MIG/MAG/CO2 Welding Machines
OPERATOR’S MANUAL
(PLEASE READ CAREFELLY BEFORE OPERATION)
CHENGDU HUAYUAN ELECTRIC EQUIPMENT CO., LTD.

NB-200/250/315/350/500/630IGBT OPERATOR’S MANUAL
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Safety Depends on You
Huayuan arc welding and cutting equipments are designed and built with safety in mind. However, your
overall safety can be increased by proper installation.
DO NOT INSTALL, OPERATE OR REPAIR THIS EQUIPMENT WITHOUT READING THIS MANUAL AND
THE SAFETY PRECAUTIONS CONTAINED THROUGHOUT. And, most importantly, think before you act
and be careful.
Special Attention (Very Important):
●AVOID FALLING DOWN WHEN THE WELDING MACHINE IS PLACED ON THE
INCLINED PLANE.
●IT’S CAN NOT BE USED FOR UNFREEZING PIPELINES.
●THE SHIELD RANK OF THIS SERIES OF WELDING MACHINE IS IP21S, AND IT IS NOT
SUTABLE FOR WORKING IN THE RAIN.
Purchase Date：
Serial Number：
Machine Type：
Purchase Place：

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Cautions
Arc and arc rays may harm health.
Arc welding can be hazardous. All performing welding workers ought to have health
qualification that provided by authority organization. Protect yourself and others from possible serious
injury or death. Keep children away. Pacemaker wearers should consult with their doctor before
operating. Be sure that all installation, operation, maintenance and repair procedures are performed
only by qualified individuals.
1Electric shock can kill: The electrode and work (or ground) circuits are electrically “hot” when
the welder is on. Do not touch these “hot” parts with your bare skin or wet clothing, Wear dry,
hole-free gloves to insulate hands. Users need to follow the below items to avoid electric
shocks:
Insulate yourself from work and ground using dry insulation. Make certain the insulation is large enough to cover
your full area of physical contact with work and ground. Otherwise, use automatic or semiautomatic welding
machines, DC welding machines as possible as you can.
In semiautomatic or automatic wire welding, the electrode,electrode reel, welding head, nozzle or semiautomatic
welding gun are also electrically“hot”.
Always be sure the work cable makes a good electricalconnection with the metal being welded. The connection
should be as close as possible to the area being welded.
Ground the work or metal to be welded to a good electrical(earth) ground.
Maintain the electrode holder, work clamp, welding cable and welding machine in good, safe operating condition.
Replace damaged insulation.
Never dip the electrode in water for cooling.
Never simultaneously touch electrically“hot”parts of electrode holders connected to two welders, because voltage
between the two can be the total of the open circuit voltage of both welders.
When working above floor level, please do wear safety belt to avoid falling or losing balance on electric shock.
2Arc rays can burn: Use a shield with the proper filter and cover plates to protect your eyes
from sparks and the rays of the arc when welding or observing open arc welding. Headshield
and filter lens should conform to nation standards.
Use suitable clothing made from durable flame-resistant material to protect your skin and that of
your helpers from the arc rays.
Protect other nearby personnel with suitable, non-flammable screening and/or warn them not to watch the arc nor
expose themselves to the arc rays or to hot spatter or metal.
3Fumes and Gases can be dangerous: Welding may produce fumes and gases hazardous to
health. Avoid breathing these fumes and gases. While working in limited room, use enough
ventilation and/or exhaust to keep fumes and gases away from the breathing zone, or use the
respirator.
Shielding gases used for arc welding can displace air and cause injury or death. Always use enough
ventilation,especially in confined areas, to insure breathing air is safe.
Do not weld in locations near chlorinated hydrocarbon vapors coming from degreasing, cleaning or spraying
operations.The heat and rays of the arc can react with solvent vapors to form phosgene, a highly toxic gas, and
other irritating products.
Read and understand the manufacturer’s instructions for this equipment and the consumables to be used, including
the material safety data sheet (MSDS) and follow your employer’s safety practices. Make sure they are asepsis
and innocuity.
4Spatter: Welding or cutting spatter can cause fire or explosion.
Remove fire hazards from the welding area.If this is not possible, cover them to prevent the
welding sparks from starting a fire. Remember that welding sparks and hot materials from
welding can easily go through small cracks and openings to adjacent areas. Avoid welding near
hydraulic lines. Have a fire extinguisher readily available.
Where compressed gases are to be used in the field, special precautions should be used to prevent explosion.
When not welding, make certain that no electriferous part is touching the work piece or the work stage.
Accidental contact can create a fire hazard.
Do not weld containers or lines, which are not proved to be innocuity.
Do not heat, cut or weld tanks, drums or containers until the proper steps have been taken to insure that such
procedures will not cause flammable or toxic vapors from substances inside. They can cause an explosion even though
they have been“cleaned”.
Spatter might cause burn. Wear leather gloves, heavy shirt, cuffless trousers, high shoes and a cap over your hair
to prevent from burning by spatter. Wear the ear shield when performing sideways or face up welding. Always
wear safety glasses with side shields when being in a welding area.
The welding cables should be as close to the welding area as possible, and the short, the better. Avoid welding
cables going through the building framework, lifting chains, AC or DC cables of other welding machines and

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appliances. The welding current is strong enough to damage them while having short circuit with them.
5Cylinder may explode if damaged.
Make sure that the gas in the storage cylinder is qualified for welding, and the decompression
flowmeter, the adapter and the pipe are all in good condition.
Always keep cylinders in an upright position securely chained to an undercarriage or fixed
support.
Be sure to put the cylinder in the working space with no crash or shake, and far from welding area.
Never allow the electrode, electrode holder or any other electrically“hot”parts to touch a cylinder.
Keep your head and face away from the cylinder valve outlet when opening the cylinder valve.
Valve protection caps should always be in place and hand tight except when the cylinder is in use or connected for
use.
6Power: (For electrically powered welding and cutting equipment) Turn off input power before
installation, maintenance and repair to avoid accidents.
Huanyuan welding equipment is Ι class safeguard equipment; please install the equipment in
accordance with the manufacturer’s recommendations by specific persons.
Ground the equipment perfectly in accordance with the manufacturer’s recommendations.
7Power:(For engine driven welding and cutting equipment)
Work in ventilated place or outdoors.
Do not add fuel near to fire or during engine starting or welding. When not working, add fuel after
engine is cooling down; otherwise, the evaporation of hot fuel would result in dangers. Do not
splash fuel out of the fuel tank, and do not start the engine until complete evaporation of the
outside fuel.
Make sure that all the safeguard equipments, machine cover and devices are all in a good
condition. Be sure that arms, clothes and all the tools do not touch all the moving and rotating
components including V belt, gear and fan etc.
Sometimes some parts of the equipment have to be dismantled during maintenance, but you still
have to keep the strongest safety awareness .
Do not put your hand close to fans and do not move the brake handle while operating.
Please remove the connection between the engine and the welding equipment to avoid sudden starting during
maintenances.
When engine is hot, it is forbidden to open the airtight cover of the radiator water tank to avoid hurt by the hot
vapor.
8Electromagnetic: Welding current going though any area can generate electromagnetic, as well
as the welding equipment itself.
Electromagnetic would affect cardiac pacemaker, the cardiac pacemaker users should consult
one’s doctor first.
The effect of electromagnetic to one’s health is not confirmed, and it might have some negative effect to one’s
health.
Welders may use following method to reduce the hazardous of electromagnetic:
a. Bundle the cable connected to the work piece and the welding cable together.
b. Do not enwind partially or entirely your body with the cable.
c. Do not place yourself between the welding cable and the ground (work piece) cable, if the welding cable is by
your left side, then the ground cable should be by your left side too.
d. The Welding cable and the ground cable are as short as possible.
e. D e. Do not work near to the welding power source.
9Lifting equipment: carton or wooden boxes package the welding machines supplied by
Huayuan. There is no lifting equipment in its wrapper. Users can move it to the prospective area
by a fork-lift truck, then open the box.
If there are rings, the machine can be transited by rings. While Huayuan Welding Machine
Manufacture reminds users, there is potential risk to damage the welding machine. So it is better
to push the welding machine by its rollers unless special situations.
Be sure that the appurtenances are all removed off when lifting.
When lifting, make sure that there is no person below the welding machine, and remind people
passing by at any moment.
Do not move the hoist too fast.
10 Noise: Huayuan Welding Machine Manufacture reminds users: Noise beyond the limit (over
80 db) can cause injury to vision, heart and audition depending on oneself. Please consult local
medical institution. Use the equipment after doctor’s permission would help to keep healthy.

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CONTENTS
1. Usage notices -------------------------------------------------6
Model Explanation
Features & Advantages
Usage
Safety
Environmental Area
Input power conditions
Installation diagram
Components name and Function Introductions
2. Connections --------------------------------------------------11
Connections of the power supply cable and the ground wire
Connection of the manual welding output cable
Connections of Gas-shielded Welding
2.3.1 Connection of the output cable
2.3.2 Connections of the power source, wire feeder and the welding torch
2.3.3 Connections of the gas cylinder and the gas adjustor
3. Directions of the manual welding mode ---------------12
4. Directions of the Gas-shielded Welding mode---------12
Checking items ,methods and requests & preparations before operation
4.1.1 Wears of safeguards
4.1.2 Checking after connections
4.1.3 Operation of switches & adjustment of gas flux
4.1.4 Installation of the welding wire
4.2 Directions of the basic welding
4.2.1 Welding operation with arc ending function
4.2.2 Welding operation without arc ending function
5. Directions of prolonged output cable -----------------14
6. Technical conditions ------------------------------------- 14
6.1 Technical parameters
6.2 Instructions of keywords
6.3 Examples of welding condition
7.Working principle ----------------------------------------18
7.1 Summarize of working principle
7.2 Main electric elementary diagram
8.Troubles and troubleshooting---------------------------18
9. Packing list -------------------------------------------------20

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1. Usage Notices
1. 1 Model Explanation
Model: N B — □□□ IGBT
IGBT inverter
Rated welding current
Semi-Automatic welding
Melt electrode gas shielded
welding machine
Features & Advantages
Strike arc at high voltage and slow wire feeding , which makes steady arc starting and high success
rate.
Unique control circuit of arc voltage and current feedback, which makes stable welding process,
low spatter, beautiful welding shaping, strong length change adaptability and wide adjusting range of
current&voltage matching.
Excellent F.T.T - Globule control circuit makes positive striking of arc.
Function of arc crater filling to improve the quality of the arc-ending seam.
PWM inverter technique is adapted, the frequency can achieve 20KHz with high speed of dynamic
response.
It can be widely used in Gas-shielded welding, carbon arc air gouging and manual welding.
Usage
It is suitable for welding mild steel, stainless steel, aluminum and their alloy.
It is fit for flat welding, stand welding, face-upward welding and across welding, both for solid
welding wire and flux-cored welding wire with the diameter of Ф1.0、Ф1.2、Ф1.6.
Safety
For you and others safety, please do obey the below items.
□The machine have to be grounded reliably
To prevent electric shock, make sure the grounded bolt of the power source is grounded well.
□The safeguards should be worn
To prevent injury of your eyes and skin from the ultraviolet radiation, strong sparks and splash,
please be sure to conform to the rules and byelaws related to the working protection to wear certain
safeguards.
□Don`t inbreathe the deleterious welding gas
The gases and fumes produced by welding are hazardous to health. Make sure to conform to the
rules and byelaws related to the working protection to wear certain safeguards and install the
ventilator.
□The shielded gas cylinder have to be located in a fixed place to avoid being shocked.
□The machine and working area should keep away from those flammable things.
□Prevent sundries from getting into the machine and sharp thing from cutting cables.
□Prevent the machine from damage by falling or hitting. Once it falls or be hit, the machine
cannot be used again without professional checking.
Environmental Area
If the work conditions fall short of the below items, the working performance may not meet the
technical criterion, and the machine will be damaged.
□The machine should be put on where there is low humidity, little dust and no direct sunlight,
rain, flammable things, corrosive gas and materials.

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□The environment temperature range should be -10℃～40℃.
□Avoid metal sundries entering into the power source.
□The distance between the power source and wall or other close things should be more than
30cm. The distance between two machines should be more than 30cm.
□It should be operated in where there’s no wind.
□It should be operated in where the altitude is less than 1000m.
Input Power conditions
Power supply : 3～50Hz380VAC
The fluctuation range of distribution voltage:＜±15%
The fluctuation range of frequency: ＜±1%
The imbalance rate of three-phase voltage :＜±5%
While using engine generator, the output power should be two times larger than the rated input
power of the welding power source and compensation coil is needed.
Installation diagram
Connection between welding equipments and other equipments(Please refer to the Figure 1).
1.8 Components name and Function Introductions (Please refer to the Figure 2)
1. Voltage meter: to indicate the actual welding voltage
2. Current meter: to indicate the actual welding current
3. Current adjustment knob: When switch 10 is placed on the manual welding position, this
knob can adjust the manual welding current. When switch 10 is placed in the gas-shield
welding position, this knob can adjust the gas-shield welding current.
4. Arc ending voltage adjustment knob: adjust the arc ending voltage
5. Arc characteristic adjustment knob: While used as gas-shield welding, it is to adjust and
control the current changing rate in different duration of the melt drop transfer in the
welding process. It will directly influence arc’s soft and rigid characteristics, quantity of
spatter, shaping of welding seam and the stability of arc. It is advised to use standard
characteristic. Adjust it to the soft characteristic while doing as small criterion welding, and
adjust it to the rigid characteristic while doing as middle and large criterion welding. (Note:
the softer arc, the less spatter, vice versa.)
6. Under voltage indicator lamp: When the distribution voltage is lower than 320VAC, it
lights, and the output current will be cut automatically. After the voltage is back to normal,
the machine will work again.
7. Over heat indicator lamp: If it runs in excess of its rated duty cycle, or in a high
temperature environment, the power radiator’s temperature achieves 75℃±5℃, the heat
protection circuit begins to work, and the heat indicator lamp lights, the output current will
be cut off. However, the fan will keep working, wait until the temperature is below the
fixed and lamp is turned off, you can restart the machine. If the entrance of the gas path is
jammed or the fan doesn’t work, the lamp will also light.
8. Power source indicator lamp: As soon as start the machine, it lights.
9. Welding model conversion switch: It is to switch the welding model from manual welding
to gas-shield welding.
10. Welding wire diameter conversion switch: It is to switch the standard welding wire’s
diameter to adopt the machine. It is actually to choose the suitable welding program. Turn
the switch to the diameter matched with the welding wire.
11. Welding wire type conversion switch: It is to switch the standard welding wire’s type to
adopt the machine. Turn it to the solid position while using solid welding wire; turn it to the
flux-cored position while using flux-cored welding wire.

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12. Arc ending conversion switch：It is to determine whether fill the arc holes at the end of
welding. That means to determine whether use arc ending function or not.
13. Gas-supply conversion switch：To check gas flow, turn it to "checking" position; to weld,
turn it to "welding" position.
14. Power overload protection switch: To cut off power and protect the machine when
abnormal, it is only used for protection, you should use other power switch while installing.
15. Control signal interface: Output interface of arc striking, to control automatic welding
equipments. The rated control load ability is 3A/250VAC or 3A/30VDC.(This interface is
optional)
16. Power interface of heater: Power socket of the gas heater, its output voltage is 36VAC.
17. Power source fuse base: This fuse wire is used in the welding control system, its
specification is RF1-20-3A.
18. Input connection line of three phase power: connect it to distribution box, the
green-yellow line should be connected to protective ground line well.
19. Adjustment knob of welding current: To adjust the welding current.
20. Adjustment knob of welding voltage: To adjust the welding voltage.
21. Manual wire feeding button：Press the button, the wire feeder begins to feed wire. The
speed of wire feeding can be adjusted by the welding current adjustment knob. While using
thinner wire, the feeding speed should be slowed down to avoid distorting the wire.

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Figure 1. Connection between the welding equipment and other equipments
Gas Cylinder
Gas Pipe
Connect to the ‘+’ output
Connect to the control socket of the wire feeder
Connect to the ‘-’ output
3-Phase Power
Switch Box
3-Phase Power Line
Power source of the Gas
Heater
Workpiece

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Figure 2. Names of the components

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2. Connections
(The user should choose the power cables, switches, fuses and power switches that on the switchboard
according to the table below)
2.1 Connections of the power supply cable and the grounding cable
Methods and requirements
Make sure the power source is cut off before connecting.
Do not connect with wet hands.
Do not place anything on the power supply cable.
Make sure all the connections are reliable.
Connect the green-yellow wire of the three-phase input cable to the grounding wire on the
switchboard reliably.
2.2 The output cable connection of manual welding
Methods and requirements:
Please make sure the power switch is cut off before connecting.
Connect the copper connector of workpiece cable to the ‘+’ and ‘--’ output socket that on the
welding power source. When it is negative connection ，the welding electrode holder should be
connected to the ‘+’. When it is positive connection，the welding electrode holder should be connected
to the ‘--’
The welding cable and workpiece should be reliably connected by bolts, and keep good contact.
2.3 Connections of Gas-shielded Welding
2.3.1 Connection of the output cable
Methods and requirements
Please make sure the power switch is cut off before connecting.
Connect the copper connector of wire feeder cable to ‘+’ output that on the welding power source;
Connect the copper connector of workpiece cable to ‘--’ output that on the welding power source,
connect the other side to workpiece with bolts;
Insert the aviation plug(six cores) of control cable into the control socket(six cores) of wire feeder,
then tighten the ring nut, connect the other side of control cable to wire feeder.
2.3.2 Connections of the power source, wire feeder and welding torch(please refer to
figure 1)
Methods and requirements
Make sure the power switch is cut off before connecting;
Wire feeders that produced by our company are requested to match with the certain welding
machine. Otherwise the welding performance maybe bad and even damage the machine;
Insert the aviation plug(six cores) of control cable into the control socket(six cores) of wire feeder,
then tighten the ring nut;
Aim the control plug of the welding gun at the guide slot, then insert it into the control output
socket (2 pins), then tighten the ring nut. After the connector of welding torch aiming at guide slot,
you can insert it completely. And then turn 90° by clockwise rotation and tighten the bolts; Connect
the gas pipe of welding torch to the gas output connector of wire feeder, and then tighten the nuts.
2.3.3 Connections of the gas cylinder and gas adjustor
Methods and requirements
Install the gas adjustor to the gas cylinder, and screw down the nuts.
Connect the aero plug of the gas heater to the heater’s power source socket on the back panel of the
machine, and screw down the nuts.
Connect the windpipe of the wire feeder to the gas output connector of the gas heater, fix it by a
Specification
NB-200/250I
GBT
NB-315/350I
GBT
NB-500IG
BT
NB-630IG
BT
Switch capacity（A）
25
40
63
100
Fuse capacity（A）
18
32
40
63
Section surface of power supply cables（mm2）
2.5
4
6
8
Section surface of grounding cables（mm2）
2.5
4
6
8

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tightener.
When used as CO2 shield welding, make sure the gas meet the requests of welding. Otherwise
welding defeat may appear.
When used as MAG welding, make sure the mixed gas meet the requests of MAG welding. To
avoid the mixed gas being asymmetrical, please use compounding device of proportioned gases.
3. Directions of the manual welding mode
Turn on the power switch of distribution box.
Turn the welding model switch to the manual welding model.
Before welding, make sure the output terminal of the welding machine is connected to the welding
cable reliably according to the section 2.2 above. The welding current is adjusted by the current
adjustment knob on the panel.
Please wear fur glove and safety shoes, wear a shield filter glass that match with different welding
current.
4. Directions of the Gas-shielded Welding mode
( Please read this manual carefully and operate according to it strictly）
4.1 Checking items ,methods and requests & preparations before operation
4.1.1 Wears of safeguards
a) Wear fur gloves and safety shoes to protect the skin and bare parts;
b) Wear a shield filter glass that match with different welding current to protect eyes;
c) There should be ventilation in the welding place to prevent breathing in deleterious gas .
4.1.2 Checking after connection:
a) Check out all the items according to the section 2.3 “Connections of Gas-shielded
Welding”, make sure there’s no error.
b) Check out all the items according to the section 1.6 “Input power condition” to meet all the
requests.
4.1.3 Operations of the switches & adjustment of gas flux
First, turn on the power switch of distribution box;
Second, turn the welding model switch to the “gas-shield” welding model;
Third, turn the “welding wire’s type ”switch and the “welding diameter” switch to the right
position to meet the type and diameter of welding wire;
Fourth, turn the “Gas-supply” switch to “check” position;
Fifth, turn on the gas valve of the cylinder, and then adjust the switch of the flowmeter slowly to
meet the value needed;
Sixth, turn the “gas supply” switch to “welding” position.
4.1.4 Installation of the welding wire
The name of operation components please refer to Figure 3 (NB200/315IGBT have no
components that in the dotted circle)
Methods and requirements
First, make sure that the size of the wire feeding slot at the outer side of the wire feeding wheel
fits with the diameter of the used welding wire, otherwise, dismantle the wire feeding wheel and
choose suitble diameter wire, install the wheel and make the slot be at the outer side perfectly;
Second, pull down the handle of wire feeder, and then lift the press-arm;
Third, install the welding wire reel to the welding wire reel’s axis, adjust the baffle of the
welding wire reel’s axis to be spread，screw down the manual nut. The out end of the wire is below.
The welding wire comes out at clockwise rotation;
Fourth, let welding wire go through the wire rectification wheel (or guide pipe), wire feeding
wheel slot, then insert into the guide tip;
Fifth, press the welding wire with press-arm, and then pull up the handle to press the press-arm,
circumgyrate the handle with suitable strength;
Sixth, check up the tip of welding torch, whose aperture diameter should meet the diameter of the
wire;
Seventh, press “manual wire feeding” button on the control box of wire feeder, adjust “welding
current adjustment” knob for a right feeding speed. You can loosen the button until there is

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15—20mm wire outside of welding torch.
Figure 3 Installation of welding wire
Figure 3. Installation sketch map of welding wire
4.2 Directions of the basic welding
Welding can be performed by the “arc ending” switch and welding torch switch on the panel
in two methods : with arc ending self-lock and acting with the switch on the welding
torch synchronistically without arc ending function.
4.2.1 Welding operation with arc ending function
1) Features instruction:
a) The main features of the welding function is the ability to fill up the hollows when ending
weld, which can be propitious to connect the start-point and end-point of the welding seam
continuously;
b) Mainly used in welding middling thickness plate;
c) The self-lock will be canceled if the arc is stopped for more than 0.5s.
2) Operation regulations
a) Turn the “arc ending” switch to “yes” position;
b)After on standby state, press the welding torch switch, it begins to feed gas and come into the
gas pre-flow state . After feeding gas for some time, welding voltage appears, then coming
into the arc starting state and begins to feed wire slowly. After successful arc starting, the wire
feeding speed will become normal, and then welding current appears. Then you can loosen the
welding torch`s switch, welding goes into the self-lock state. Simultaneously, you can adjust
the “welding voltage adjustment” knob and “welding current adjustment” knob for the best
welding performance;
c) When welding is finishing, press the welding torch switch again, and it come into arc ending
adjustment state. Then, set the arc ending voltage and current by adjusting the relative knobs
on the welding power panel (or adjust them to the needed values respectively in advance,
commonly to the 60～70% of the normal welding current ) , thus you can control and adjust
the effect of filling up hollows at the end of welding. Then loosen the welding torch`s switch
again, wire feeding stops immediately, it will come back to burn state, the welding voltage
will decrease and become back burn voltage. When the welding current becomes zero, arc
quenches, gas feeding stops, and the welding finishes.
4.2.2 Welding operation without arc ending function (operate with welding torch`s
下搬/上压
抬起/压下
焊枪
接口
手
柄压臂
导向嘴
送丝轮
矫丝轮
矫正手
轮
矫正支座
NB-350IGBT
为焊丝导向管
焊丝
Welding Gun Connector
Handle
Guide Tip
Wire Feeding Wheel
Press Arm
Rectify Wire Wheel
Welding Wire
Rectification
Support Saddle
Rectification
Wheel
Wire Leading
Tube for
NB-350IGBT

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switch synchronously)
1) Features instruction:
a) Press the welding torch`s switch to start welding, and loosen it to stop welding;
b) It is suitable for orientation welding and spot welding of thin plate;
c) There is no arc ending process.
2) Operation regulations:
a) Turn the “arc ending” switch to “no” position;
b) After on standby state, press the welding torch switch, it begins to feed gas and come into the
gas pre-flow state . After feeding gas for some time, welding voltage appears, then coming into
the arc starting state and begins to feed wire slowly. After successful arc starting, the wire
feeding speed will become normal, and then welding current appears. But you can`t loosen the
switch now.Simultaneously, adjust the “welding voltage adjustment” knob and the “welding
current adjustment”knob for the best performance of welding;
c) When welding is finishing, loosen the welding torch switch, wire feeding stops immediately,
and become back burn state, The welding voltage will decrease and becomes back burn voltage.
When welding current becomes zero, arc quenches, gas sending stops, and the welding finished.
5 . Directions of prolonged output cable
The connection cable on this series of machine is allowed to be lengthened between power source
and wire feeder, but the below regulations have to be followed.
a) The resistance of cable will increase, and the increase of the cable’s voltage drop will make
against the welding. Moreover, the smaller cable sectional area is, the greater influence will be;
b) When lengthening the cable, the shorter, the better;
c) When lengthening cable, get the cable straight.
6 . Technique conditions
6.1 Technical parameters
TYPE
PARAMETER
NB-200IGBT
NB-250IGBT
NB-315IGBT
NB-350IGBT
NB-500IGBT
NB-630IGBT
Shield rank
IP21S
Rated input voltage
Three-phase power 3~380VAC 50Hz
Rated input capacity
6.7KVA
9.4KVA
13.2KVA
16.5KVA
26.3KVA
36.2KVA
Gas-shield
welding
Output
current
60～200A
60~250A
60~315A
60～315A
60～500A
60～630A
Output
voltage
17～24V
17～26.5V
17～29.8V
17～31.5V
17～39V
17～44V
manual welding
Output
current
60～200A
60~250A
60~315A
60～315A
60～500A
60～630A
Output
voltage
22.4～28V
22.4～30V
22.4～32.6V
22.4～34V
22.4～40V
22.4～44V
Arc ending current
60～200A
60~250A
60~315A
80～315A
80～500A
80～630A
Arc ending voltage
17～25V
17～28V
17～32V
17～40V
17～40V
17～40V
Duty cycle
60%
60%
60%
100%
100%
100%
Rated current
200A
250A
315A
350A
500A
630A
Suited welding wire’s
diameter
Solid 0.8mm
1.0mm
Solid 0.8mm
1.0mm
Solid 0.8mm
1.0mm
Solid 0.8mm
1.0mm
1.2mm
Solid 1.0mm
1.2mm
1.6mm
Solid 1.0mm
1.2mm
1.6mm

NB-200/250/315/350/500/630IGBT OPERATOR’S MANUAL
14
Flux-cored
1.0mm
Flux-cored
1.0mm
Flux-cored
1.0mm
1.2mm
Flux-cored
0.8mm
1.0mm
1.2mm
Flux-cored
1.0mm
1.2mm
1.6mm
Flux-cored
1.0mm
1.2mm
1.6mm
Outline
(length×width×height)
570×290×530（mm）
640×290×530
（mm）
640×320×570
（mm）
Weight
31Kg
32Kg
34Kg
39Kg
45Kg
54Kg
* Its rated duty cycle is 60％, that means in a 10 minutes working period，the machine will run for
6 minutes under rated welding current and rest for 4 minutes. If the Rated duty cycle is 100%,that
means in a 10 minutes working period，the machine will run for 10 minutes under rated welding
current without rest. If the machine works over the rated duty cycle, the inner temperature will rise
and exceed the fixed threshold. In order to avoid worsening the performance or even burning out
the machine, there is heat protection on this series of welding machine. When the inner temperature
exceeds the fixed, he heat protection begins to work, the overload indicator lamp lights, at this time
the machine has no output. Wait until the temperature is below the fixed and the overload indicator
lamp is turned off, the machine recovers and go on welding.
6.2 Instructions of keywords
Definition of “yes”/ “no” arc ending:
There will normally be a small hole at the terminal of the welding seam unless the welding
current is very small, and this hole is called “arc hole” in jargon. The reason is that condensation
shrinking of the melting metals and the pressure of arc. Commonly, the larger welding current is,
the larger hole will be. In the welding component, welding bug will appear because of the “arc
hole”. So, make the hole smaller as possible as you can. We call the method of filling the “arc
hole” as “arc hole filling weld”, and the standard current value set is 60 ～70% of the welding
current.
When the welding ends, operate the welding torch switch and change into the arc ending
welding program with lower current than the welding current, we call it arc ending “yes”. Arc
ending “no” means there is no control program of filling up the arc hole. Operate the welding torch
switch and end the welding with normal welding current.
What is the slow wire feeding speed of arc striking?
To get stable arc striking, decrease the feeding speed and let it below the normal wire feeding
speed, this control process is called the control of slow wire feeding of arc striking. The slowdown
speed is called the slow wire feeding speed of arc striking.
What is burn-back time?
After welding, wire feeder is not stop even if the welding torch switch is shut down because of
inertia. So there will be some more wire drive out from the torch, thus the wire will adhere to the
workpiece, or it will cause difficulty in arc striking next time. In order to avoid this defeat, it is
necessary to deal with it inside the welding machine, so that after shutting down the welding torch
switch, the output voltage will still exist for a short time to burn the wire. This process time is
burn-back time. This time varies because of differences in welding conditions, the resistance of
welding feeding tube and the length of output cable.
6.3 Examples of welding condition
Data in table 1, table 2 is the reference value under the standard condition.
When welding, please correct the values according to workpieces and the welding position to get
the right welding conditions.
Table 1:

NB-200/250/315/350/500/630IGBT OPERATOR’S MANUAL
15
Thicknes
s
(mm)
Length
(mm)
Wire
diameter
(mm)
Welding
current
(A)
Welding
voltage
(V)
Welding
speed
(cm/Min)
Stick
out
(mm)
Gas flow
(L/ Min)
T type welding
Slow speed
1.0
2.5～3
0.8
70～80
17～18
50～60
10
10～15
1.2
3～3.5
1.0
85～90
18～19
50～60
10
10～15
1.6
3～3.5
1.0,1.2
100～110
18～19.5
50～60
10
10～15
2.0
3～3.5
1.0,1.2
115～125
19.5～20
50～60
10
10～15
2.3
3～3.5
1.0,1.2
130～140
19.5～21
50～60
10
10～15
3.2
3.5～4
1.0,1.2
150～170
21～22
45～50
15
15～20
4.5
4.5～5
1.0,1.2
180～200
23～24
40～45
15
15～20
6
5～5.5
1.2
230～260
25～27
40～45
20
15～20
8, 9
6～7
1.2,1.6
270～380
29～35
40～45
25
20～25
12
7～8
1.2,1.6
300～380
32～35
35～40
25
20～25
High speed
1.0
2～2.5
0.8
140
19～20
150
10
15
1.2
3
0.8
140
19～20
110
10
15
1.6
3
1.0, 1.2
180
22～23
110
10
15～20
2.0
3.5
1.2
210
24
110
15
20
2.3
3.5
1.2
230
25
100
20
25
3.2
3.5
1.2
260
27
100
20
25
4.5
4.5
1.2
280
30
80
20
25
6
5.5
1.2
300
33
70
25
25
Put up weld (thin plate)
Slow speed
0.8
0.8
60～70
16～17
40～45
10
10～15
1.2
0.8
80～90
18～19
45～50
10
10～15
1.6
0.8
90～100
19～20
45～50
10
10～15
2.3
0.8
100～130
20～21
45～50
10
10～15
1.0,1.2
120～150
20～21
45～50
10
10～15
3.2
1.0,1.2
150～180
20～22
35～45
10～
15
10～15
4.5
1.2
200～250
24～26
40～50
10～
15
10～15
High speed
2.3～3.2
1.2
220
24
150
15
25
300
26
250
15
25
Corner weld
Slow speed
1.6
0.8
65～75
16～17
40～45
10
10～15
2.3
0.8
80～100
19～20
40～45
10
10～15
3.2
1.0, 1.2
130～150
20～22
35～40
15
10～15
4.5
1.0, 1.2
150～180
21～23
30～35
15
10～15

NB-200/250/315/350/500/630IGBT OPERATOR’S MANUAL
16
Table 2:
7. working principle
7.1 Summarize of working principle
The inputed three-phase AC 380VAC50Hz(60Hz) is rectified and supplied to the IGBT inverter to
produce 20 kHz AC. This AC is transformed by the high–frequency transformer and rectified; then goes
into the output of DC power.
7.2 Main electric elementary diagram
Please refer to appendix 1.
8. Troubles and troubleshooting
8.1 Please check with multimeter if there are any troubles:
Three-phase power should be 380±50VAC, check if there is phase lack or exceeding voltage
fluctuation;
Whether the fuse on the back panel of the welding machine is melted;
Whether the three-phase power switch at the switchboard is damaged; Whether the fuse and
electrical power wire are installed reliably, Otherwise it will cause phase lack or they are not connected
tightly, so the welding machine will work abnormally.
The control cable of the wire feeder is easy to be broken, check the related pins of the two
connector plugs with six pins at the ends of the control cable to be conductive, whether the welding
cable is connected reliably, and the workpiece is connected tightly.
Whether the welding torch switch and the wire connected are damaged or open circuit; whether the
nozzle, conduct tip , conduct tip’s seat and shunt are burned out and damaged.
ATTENTIONS:
This welding machine adopts large capacity,high voltage and electrolytic capacitor filter, it can not
be opened until the three-phase power is shut down more than 10 minutes.
Thick
-ness
(mm）
Wire
diameter
(mm)
Root
gap
G（mm）
Welding
current
(A)
Welding
voltage
（V）
Welding
speed
(cm/Min)
Wire out
(mm）
Gas
flux
(L/Min)
I type butt welding
Slow speed
0.8
0.8
0
60～70
16～16.5
50～60
10
10
1.0
0.8
0
75～85
17～17.5
50～60
10
10～15
1.2
0.8
0
80～90
17～18
50～60
10
10～15
1.6
0.8
0
95～105
18～19
45～50
10
10～15
2.0
1,1.2
0～0.5
110～120
19～19.5
45～50
10
10～15
2.3
1,1.2
0.5～1
120～130
19.5～20
45～50
10
10～15
3.2
1,1.2
1～1.2
140～150
20～21
45～50
10 ～
15
10～15
4.5
1,1.2
1～1.5
170～185
22～23
40～50
15
15
6
Face
1.2
1.2 ～
1.5
230～260
24～26
40～50
15
15～20
Inside
1.2
1.2 ～
1.5
230～260
24～26
40～50
15
15～20
9
Face
1.2
1.2 ～
1.5
320～340
32～34
40～50
15
15～20
Inside
1.2
1.2 ～
1.5
320～340
32～34
40～50
15
15～20
High speed
0.8
0.8
0
89
16.5
120
10
15
1.0
0.8
0
100
17
120
10
15
1.2
0.8
0
110
18
120
10
15
1.6
1,1.2
0
160
19
120
10
15
2.0
1,1.2
0
180
20
80
15
15
2.3
1,1.2
0
200
22
100
15
20
3.2
1.2
0
240
25
100
15
20

NB-200/250/315/350/500/630IGBT OPERATOR’S MANUAL
17
8.2 Common troubles and troubleshooting
Troubles
Reasons
Troubleshooting
1．Turn on power,
the indicator lamp
doesn’t light, the
digital meter doesn’t
light.
1．Phase lack；
2．Power switch is damaged；
3．Power control fuse (3A) is melted；
1．Check the three-phase power；
2．Replace input power switch；
3．Replace Power control fuses；
2．Welding machine
does not work ，the
undervoltage
indicator lamp lights
1．Phase lack；
2．Three-phase power is under voltage；
1. Check the three-phase power
to make sure it meet the
requirements of the machine；
3. There is no output
voltage and there
is noise inner the
machine
1．The fast recovery diode of the main
circuit is damaged；
1.Check and replace the damaged
fast recovery diode;
4．Welding machine
doesn’t work ，over
heat indicator lamp
lights
1．The temperature is too high；
2．When welding ，cooler fans rotate
slowly or don’t work, which leads to
bad cooling；
3．Temperature relay is damaged；
1．Welding machine will become
normal after rest for some time；
2. Check the fans power or
change cooling fans；
3．Replace temperature relay；
5．Welding wire
feeder works, but
there is no wire
feeding or the
feeding isn’t
stable.
1．Wire press wheel is not pressed
tightly；
2．The type of wire feeding slot doesn’t
match the welding wire；
3．The tip is jammed because of the
spatters；
4．The wire feeding wheel is abraded；
5．The wire feeding tube of the welding
torch is jammed；
6．The curving semidiameter of the
welding torch cable is too small；
1．Press tightly；
2. Replace wire feeder wheel
slot；
3．Clean the spatters in the tip；
4．Change wire feeding wheel；
5．Blow off the dust with the dry
compressed air or replace a right
one with the same type；
6. Make the curving
semidiameter of welding torch
cable over 300mm；
6．The feeder don’t
work after pressing
down the torch
switch or there is no
open circuit voltage
1．The control cable of the wire feeder
is broken；
2．Short circuit of welding gun switch;
3．The PCB is broken；
1．Replace the control cable；
2．Check control wire of the
welding torch switch；
3．Repair or replace the PCB；
7．Many pores in the
welding seam
1．CO2gas is not pure；
2．The gas flow is not enough；
3．There is rust or oil in the welding
seam；
4．The wind is strong when welding；
5．The path of CO2is jammed or air
leak；
6．Valve doesn’t work；
1．Use pure CO2gas；
2．Adjust the gas flow；
3．Clean the welding seam；
4．The precaution against wind
should be adopted；
5．Check the path;
6．Check the voltage 24VDC of
the valve winding；

NB-200/250/315/350/500/630IGBT OPERATOR’S MANUAL
18
7．The nozzle is distorted；
7．Replace the nozzle；
8．Current /voltage
is out of control
1．Control cable of wire feeder is
broken；
2．Current /voltage adjust potentiometer
is damaged；
3．The PCB is damaged；
1．Replace the control cable；
2．Replace the potentiometer；
3．Repair or replace the PCB；
9. Wire feeding
starts without
pressing down the
welding torch switch
1．The wire connecting welding gun is
short circuit；
2．Control cable of the wire feeder has
short circuit；
3．The manual button of wire feeding is
damaged；
1．Repair or change welding gun；
2．Repair or change control
cable；
3．Change the manual button of
wire feeding；
10．The current isn’t
stable, and there is
too much spatter
1．Welding criterion is wrong；
2．The quality of wire is bad；
3．There is rust or oil on the welding
device or wire；
4．Too much fluctuation of distribution
voltage；
5．The stick out of the wire is too
long ；
6．Choose wrong position of the wire
diameter select switch；
7．The type of wire feeding slot
doesn’t match the welding wire；
8．Problems in the protective gas；
9．Incorrect type of the tip or the
aperture of the tip becomes too big;
10．Too much feculency in the wire
feeding tube ，the resistance of the
feeding wire is too large；
11．The ground cable becomes loose；
1．Adjust the welding criterion
again；
2．Change wire；
3．Clean the welding device and
wire；
4．The fluctuation of the line
voltage can’t exceed ±15%；
5．The stick out should be about
10 times than the wire
diameter；
6．Take a right position of wire
diameter select switch；
7．Replace wire feeding wheel
slot；
8．Use the purer gas；
9．Replace tip；
10．Clean the wire feeding tube；
11．Fix the cable connected to the
ground tightly；
11．Gas heater frosts
1. The input power fuses of the heater
(5A) is burned ；
2. The resistance wire of the heater is
broken ；
1. Replace the fuse with the same
type；
2. Repair or replace the heater；
ATTENTION:
Only qualified technicians are allowed to perform troubleshooting work on the machine.If for any
reason you do not understand the test procedures or are unable to perform the tests/repairs safely,
contact our service department for technical assistance.

NB-200/250/315/350/500/630IGBT OPERATOR’S MANUAL
19
9. Packing list (another packing list for aluminum welding)
1. NB-IGBT power source 1
2. Wire feeder 1
3. CO2 gas flowmeter 1
4. Composite cable(gas tube, control wire and welding cable are include)10m
5. Ground line 1.8m
6. Welding torch with 3m cable 1
7. Operation manual 1
8. Conformity certificate 1
9. Guarantee card 1