Top Gun MULTIMIG 350F User manual

INTRODUCTION
Ⅰ
I
201507
INVERTER MIG Welding Machine
IMPORTANT: Read this Owner’s Manual Completely before attempting to use this
equipment. Save this manual and keep it handy for quick reference. Pay particular
attention to the safety instructions we have provided for your protection. Contact your
distributor if you do not fully understand this manual.
OPERATORS’MANUAL

CONTENT
- II -
CONTENT
§
1 Safety ..........................................................................................1
§1.1 Signal Explanation....................................................................................................... 1
§1.2 Arc Welding Damage................................................................................................... 1
§1.3 The knowledge of Electric and Magnetic Fields....................................................... 5
§2 Overview.......................................................................................7
§2.1 Brief Introduction........................................................................................................ 7
§2.2 Working Principle........................................................................................................ 8
§2.3 Volt-Ampere Characteristic........................................................................................ 8
§3 Installation andAdjustment.....................................................10
§3.1 Parameters ................................................................................................................. 10
§3.2 Duty cycle and Over-heat.......................................................................................... 10
§3.3 Equipment Connection...............................................................................................11
§3.4 Maintenance of MIG Gun mechanism..................................................................... 12
§3.5 Maintenance of the wire feed mechanism................................................................ 14
§4 Operation....................................................................................16
§4.1 Layout for the front and rear panel......................................................................... 16
§4.2 Welding operation...................................................................................................... 18
§4.2.1 Voltage Setting...................................................................................................................18
§4.2.2 Wire speed setting ..........................................................................................................18
§4.3 Welding parameters................................................................................................... 18
§4.4 Operation environment............................................................................................. 19
§4.5 Operation Notices...................................................................................................... 19
§5 Maintenance & Troubleshooting .............................................20
§5.1 Maintenance............................................................................................................... 20
§5.2 Troubleshooting ......................................................................................................... 21
§5.3 Electrical schematic drawing.................................................................................... 23

SAFETY
-1-
§
1 Safety
§1.1 Signal Explanation
The above signals mean warning! Notice! Running parts and getting an electric
shock or thermal parts will take damage for your body or others. The corresponding
notices are as follows. It is quite a safe operation after taking several necessary
protection measures.
§1.2 Arc Welding Damage
The following signals and word explanations are to some damages for your body
or others happening on the welding operation. While seeing these, please remind of
yourself or others to be dangerous.
Only ones who are trained professionally can install, debug, operate, maintain and
repair the equipment.
During the operation, non-concerned people should be lift, especially for children.
After shut off the machine power, please maintain and examine the equipment
according to §5 because of the DC voltage existing in the electrolytic capacitors.
ELECTRIC SHOCK CAN KILL.
Never touch electrical parts.
Wear dry, hole-free gloves and clothes to insulate yourself.
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.
Take carefully when using the equipment in small place, falling-off and wet
circumstance.
Never close the machine power before installation and adjustment.

SAFETY
-2-
Ensure to install the equipment correctly and ground the work or metal to be welded
to a good electrical (earth) ground according the operation manual.
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.
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 electrical connection with the metal
being welded. The connection should be as close as possible to the area being
welded.
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 the floor level, use a safety belt to protect yourself from a
fall should you get a shock.
FUMES AND GASES CAN BE DANGEROUS.
Welding may produce fumes and gases hazardous to health. Avoid breathing these
fumes and gases. When welding, keep your head out of the fume. Use enough
ventilation and/or exhaust at the arc to keep fumes and gases away from the
breathing zone. When welding with electrodes which require special ventilation such
as stainless or hard facing or on lead or cadmium plated steel and other metals or
coatings which produce highly toxic fumes, keep exposure as low as possible and
below Threshold Limit Values using local exhaust or mechanical ventilation. In
confined spaces or in some circumstances, outdoors, a respirator may be required.
Additional precautions are also required when welding on galvanized steel.
Do not weld in locations near chlorinated hydrocarbon vapors coming from

SAFETY
-3-
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.
Shielded 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.
Read and understand the manufacturer’s instructions for this equipment and the
consumables to be used, including the material safety data sheet and follow your
employer’s safety practices.
ARC 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.
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.
SELF-PROTECTION
Keep all equipment safety guards, covers and devices in position and in good
repair. Keep hands, hair, clothing and tools away from V-belts, gears, fans and all
other moving parts when starting, operating or repairing equipment.
Do not put your hands near the engine fan. Do not attempt to override the governor
or idler by pushing on the throttle control rods while the engine is running.
DO NOT adds the fuel near an open flame welding arc or
when the engine is running. Stop the engine and allow it to cool before refueling to
prevent spilled fuel from vaporizing on contact with hot engine parts and igniting.

SAFETY
-4-
Do not spill fuel when filling tank. If fuel is spilled, wipe it up and do not start
engine until fumes have been eliminated.
WELDING SPARKS 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 at the job site, special precautions should
be used to prevent hazardous situation.
When not welding, make certain no part of the electrode circuit is touching the
work or ground. Accidental contact can cause overheating and create a fire hazard.
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”.
Vent hollow castings or containers before heating, cutting or welding. They may
explode.
Sparks and spatter are thrown from the welding arc. Wear oil free protective
garments such as leather gloves, heavy shirt, cuff less trousers, high shoes and a cap
over your hair. Wear ear plugs when welding out of position or in confined places.
Always wear safety glasses with side shields when in a welding area.
Connect the work cable to the work as close to the welding area as practical. Work
cables connected to the building framework or other locations away from the
welding area increase the possibility of the welding current passing through lifting
chains, crane cables or other alternate circuits. This can create fire hazards or
overheat lifting chains or cables until they fail.

SAFETY
-5-
Rotating parts may be dangerous.
Use only compressed gas cylinders containing the correct shielding gas for the
process used and properly operating regulators designed for the gas and pressure
used. All hoses, fittings, etc. should be suitable for the application and maintained in
good condition.
Always keep cylinders in an upright position securely chained to an undercarriage
or fixed support.
Cylinders should be located:
-Away from areas where they may be struck or subjected to physical damage.
-A safe distance from arc welding or cutting operations and any other source of
heat, sparks, or flame.
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.
§1.3 The knowledge of Electric and Magnetic Fields
Electric current flowing through any conductor causes localized Electric and
Magnetic Fields (EMF). The discussion on the effect of EMF is ongoing all the
world. Up to now, no material evidences show that EMF may have effects on health.
However, the research on damage of EMF is still ongoing. Before any conclusion,
we should minimize exposure to EMF as few as possible.
In order to minimize EMF, we should use the following procedures:
Route the electrode and work cables together – Secure them with tape when
possible.
All cables should be put away and far from the operator.

SAFETY
-6-
Never coil the power cable around your body.
Make sure welding machine and power cable to be far away from the operator as
far as possible according to the actual circumstance.
Connect the work cable to the workpiece as close as possible to the area being
welded.
The people with heart-pacemaker should be away from the welding area.

OVERVIEW
-7-
§2 Overview
§2.1 Brief Introduction
MIG F SERIES arc welding machine adopts the latest pulse width modulation (PWM)
technology and insulated gate bipolar transistor (IGBT) power module, which can change work
frequency to medium frequency so as to replace the traditional hulking work frequency
transformer with the cabinet medium frequency transformer. Thus, it is characterized with
portable, small size, light weight, low consumption and etc.
MIG F SERIES arc welding machine uses Mix gas as shielded gas to realize gas shielded
welding, active gas（Ar+O2、Ar+CO2）as shielded gas to realize MAG welding and inactive gas
（Ar）as shielded gas to realize MIG welding.
MIG F SERIES arc welding machine has automatic protection functions with intelligent to
over-voltage, over-current and over-heat. If any one of the above problems happens, the alarm
lamp on the front panel will be lighted and output current will be shut off automatically to protect
itself and prolong the equipment using life.
MIG F SERIES Features:
1. Digital control system, real-time display the welding parameters;
2. High performance multifunction power source (MIG/MAG);
3. Waveform control, stable welding arc;
4. IGBT technology, low power dissipation;
5. Rated duty circle：MULTIMIG 350F and MULTIMIG400F are 60%(40℃),MULTIMIG
500F is 60%(40℃).
MIG F SERIES arc welding machine is suitable for all positions welding for various plates
made of stainless steel, carbon steel, alloyed steel etc, which is also applied to pipe installment,
mould mend, petrochemical, architecture decoration, car repair, bicycle, handicraft and common
manufacture.
MAG--Metal Active Gas Welding
MIG--Metal Insert Gas Welding

OVERVIEW
-8-
§2.2 Working Principle
The working principle of MIG F SERIES arc welding machine is shown as the following figure.
Three-phase 380V work frequencyAC is rectified into DC（530V）, then is converted to medium
frequency AC (about 20KHz) by inverter device (IGBT), after reducing voltage by medium
transformer (the main transformer) and rectifying by medium frequency rectifier (fast recovery
diodes), and is outputted by inductance filtering. when MIG. Meanwhile, the welding current
parameter can be adjusted continuously and infinitely to meet with the requirements of welding
craft.
§2.3 Volt-Ampere Characteristic
MIG F SERIES welding machine has an excellent volt-ampere characteristic, whose graph is shown as the
following figure. The relation between the rated loading voltage U2and welding current I2is as follows:
U2=14+0.05I2(V)
44
14
0600 I
o
（A）
U
o
（V）
Working point
Volt-ampere characteristic The relation between the rated loading
voltage and welding current

OVERVIEW
-9-
§2.4Principles of welding

OPERATION
-10-
§3 Installation and Adjustment
§3.1 Parameters
Models
Parameters
MULTIMIG 350F SYN MULTIMIG 400F SYN MULTIMIG 500F SYN
Input Voltage（V）3~380/400/440±10% 3~380/400/440±10% 3~380/400/440±10%
Frequency (HZ) 50/60 50/60 50/60
Input Current（A）MIG 19 TIG 15 MMA21 MIG 24 TIG 19 MMA25.5 MIG 33 TIG 27.5 MMA 35
Input Power（KW）MIG 12.8 TIG 10 MMA 14 MIG 15.5 TIG 12 MMA 16.5 MIG 21.5 TIG 18 MMA23
Welding Current（A
）
40-350(MIG) 40-400(MIG) 40-500(MIG)
Welding Voltage
（
V
）
10-35(MIG) 10-40(MIG) 10-50(MIG)
No-load Voltage
（
V
）
67 68 66
Duty cycle（40℃） 60%350A
100%275A
60%400A
100%310A
60%500A
100%400A
Diameter(mm)
Fe:0.6/0.9/1.0/1.2
Ss:0.8/0.9/1.0/1.2
Flux-Cored:0.6/0.8/0.9/1.0/1.
2
Fe:0.6/0.9/1.0/1.2/1.6
Ss:0.8/0.9/1.0/1.2/1.6
Flux-Cored:0.6/0.8/0.9/1.0/1.2
/1.6
Fe:0.6/0.9/1.0/1.2/1.6
Ss:0.8/0.9/1.0/1.2/1.6
Flux-Cored:0.6/0.8/0.9/1.0/1.
2/1.6
Protection class IP23 IP23 IP23
Insulation class H H H
Dimensions
（
mm
）
525*240*445 525*240*445 605*240*445
Weight
（
Kg
）
21.5 23 30
Power Factor
0.7
0.7
0.7
Note: The above parameters are subject to change with the improvement of machines.
§3.2 Duty cycle and Over-heat
The letter “X” stands for the duty cycle, which is
defined as the proportion of the time that a machine can
work continuously within a certain time (10 minutes).
The rated duty cycle means the proportion of the time
that a machine can work continuously within 10 minutes
when it outputs the rated welding current.
The relation between the duty cycle “X” and the
output welding current “I” is shown as the right figure.

OPERATION
-11-
If transformer is over-heat, the heat relay inside it will open and will output an instruction to
circuit board, cut AC relay and the output welding current, and brighten the over-heat pilot lamp
in the front panel. At this time, the machine should be relaxed for 15 minutes to cool the fan.
When operating the machine again, the welding output current or the duty cycle should be
reduced.
§3.3 Equipment Connection
Operation Steps：
1. Connect the power cable of welding machine with the output switch in electric box on the spot.
2. Connect the cable of wire feeder with the positive output of welding machine.
3. Connect the control cable of wire feeder with the aero socket on the front panel of welding machine.
4.Connect the negative output of welding machine with the workpiece (base metal).
5.Connect the heating power cable of gas cylinder to the 36V or 24V gas heating power socket on the rear panel
of welding machine.
6.Connect the output pipe of gas cylinder with the input of valve on the wire feeder.
7.Plug the joint of welding gun into the output of wire feeder. The welding wire should be aimed at the wire-in
port.
Note: The plane of the joint should aimed at screw, plugged tightly and rotated 90º, then screw the bolt tightly to
ensure the gun contacting closely.

OPERATION
-12-
8.Connect the shielded gas pipe on the welding gun with the gas output on the panel of wire feeder.
9.Connect the switch control cable of welding gun with the two-lead aero socket on the panel of wire feeder.
10.When installing wire reel, make sure the wire diameter is accordant with wire wheel and welding gun’s tip,
and press the wire properly.
§
3.4 Maintenance of MIG Gun mechanism
§3.4.1 Dissection graphics for the MIG GUN
12
34
7
11
1
2
1 3
1 4
1 5
1 6
1 7
1 8
1
9
10
9
5 6
8
3.1
§3.4.2 The parts list for the MIG GUN
NO. Description QTY. Remark
1 Tip D.12 14-15AK 1
2 Electric nozzle 0.8/M6*25 1
3 15AK Goose gun neck（Hexangular adapter and Plastic adapter）1
3.1 15AK Goose gun 1
4 Hexangular adapter 1
5
Plastic adapter
1
6 MIG blue handle 1
7
Torch Switch 21.8mm
1
8
Screw D.3*10
3
9 Handle locking ring 1
10 Cable fixing joint 15AK 1
11 Coaxial cable team /16mmq/3m 1
12 Cable thimble 12-16-25 MMQ 1
13 CO
2
Euro-rear thimble 1
14
Screw M4*6 UNI 6107
1
15
Torch locknut /plastic screw thread
1
16 Euro-main socket/flexibility pin 1
17
Feeding pipe locknut
1
18
Insulating feed pipe 0.6-0.8 3m, Blue
1
19 Spanner for the electric nozzle 1

OPERATION
-13-
§3.4.3 The operation for the MIG GUN
1. Service the wire feed mechanism at least every time the reel is changed.
·Check the wear of the feed roll groove and change the feed roll when necessary.
·Clean the welding gun wire guide with compressed air.
2. Cleaning the wire guide
Pressure of the feed rolls remove metal dust from the filler wire’s surface which then finds its
way to the wire guide. If the wire guide is not cleaned, it gradually clogs up and causes wire feed
malfunctions. Clean the wire guide in the following manner：
Remove the welding gun’s gas nozzle, contact tip and contact tip’s adapter.
With a pneumatic pistol, below compressed air through the wire guide.
Blow the wire feed mechanism and reel housing clean with compressed air.
Reattach the welding gun’s parts. Tighten the contact tip and contact tip’s adapter to spanner
tightness.
3. Changing the wire guide
If the wire guide is too worn or totally clogged, change it to a new one according to the
following instructions.
Open the mounting nut of the wire guide which exposes the end of the wire guide.
Straighten the welding gun’s cable and withdraw the wire guide from the gun.
Push a new wire guide in to the gun. Make sure that the wire guide enters all the way into the
contact tip’s adapter and that there is an O-ring at the machine-end of the guide.
Tighten the wire guide in place with the mounting nut.
Cut the wire guide 2mm from the mounting nut and file the sharp edges of the cut round.
Reattach the gun in place and tighten the parts to spanner tightness.

OPERATION
-14-
3.Wife feeder
NO
.
Parts Qty
1
Welding Voltage and other parameter regulator
1
2
Welding Current and other parameter regulator
1
3
Inductance regulator
1
4
Manual wire key
1
5
Air check key
1
6
Water /Air selecting key
1
7
2T/4T welding mode selecting key
1
8
Pre flow/Post flow/Soft start/Burn back selecting key
1
9
MIG gun connector
1
10
Spool gun connector
1
11
water connector
1
12
water connector
1
13
Wire reel Shaft
1
14 Wire Feed Motor 1
15
Pressure Control Lever
2
16
Feed roller
2
17
Spool Gun switch
1
17

OPERATION
-15-
Changing the feed roll groove
The feed roller (No.16 in the picture) is factory set for welding filler wires of 08-1.0mm and
0.6mm diameter on the other side. The feed roller side must be changed if you use 0.6mm thick
filler wire.
Threading the filler wire
Threading the filler wire as the follow steps:
Open the reel housing by pressing on the opening button and install the wire reel in such a way
that it rotates counter clockwise. You can use either a diameter 200mm or 100mm wire reel in the
machine.
Attach the reel with a reel lock.
Unfasten the wire end from the reel, but hold on it all the time.
Straighten the wire end for approximately 30 cm and cut the wire in the straightened location.
Open the pressure control level which then opens the feed gear.
Thread the wire through the wire’s rear guide to the gun’s wire guide.
Close the feed gear and fasten it with the pressure control lever. Make sure that the wire runs in
the feed roll groove.
Adjust the compression pressure with the pressure control lever no higher than to the middle of
the scale. If the pressure is too high, it removes metal fragments from the wire surface and may
damage the wire. On the other hand, if the pressure is too low, the feed gear slips and the wire
does not run smoothly.
Press the welding gun trigger and wait for the wire to come out.
Close the reel housing cover.
Note
：
When driving the wire into the gun, do not point the gun at yourself or others.

OPERATION
-16-
§4 Operation
§4.1 Layout for the front and rear panel
1. Output cathode: When MIG mode, this polarity must connect the work piece.
2. Shield gas connector: Is connected to the gas input pipe of torch.
3. Aviation plug :TIG gun control connecter.
4. Output anode: When TIG mode, this polarity must connect the work piece.
5. Shield gas input joint:
To connect one head of the gas hose while the other head of
which is connected to argon gas cylinder.
6. Output anode: used to connected to the welding cable of wire feeder
7.Aviation plug: used to connected to the control cable of wire feeder

OPERATION
-17-
8. Power source input: To connect power source.
9. water box connector: To connect water box.
10.On/off switch: Control the power supply on and off.
11. Parameter select and adjust knob: Control the parameter select and adjust.
12. Alarm Led: When the welder is over voltage, less voltage, over current or over
heated, the alarm pilot lamp will be on.
13. Power Led:Power led is lighted when open the machine.
14.Welding current and other parameter display: Welding current and other
parameter display when machine is working.
15.Hot start LED: When the hot start LED is on, it can be altered on adjusting dial.
16.Welding current LED: When the welding current LED is on, it display the actual
output welding current.
17.Arc force LED: When the arc force LED is on, it can be altered on adjusting dial.
18.Down slope LED: When the down slope LED is on, it can be altered on adjusting
dial.
19.Choose welding method key: Pressing the key can choose four kinds material,
MMA/MMA VRD/TIG/MIG.
20.MIG welding method LED
：
When the MIG welding method LED is on, the machine
start MIG welding method.
21. MMA welding method LED: When the MMA welding method LED is on, the
machine start MMA welding method.
22. MMA VRD welding method LED: When the MMA VRD welding method LED is
on, the machine start MMAVRD welding method.
23.TIG welding method LED: When the TIG welding method LED is on, the machine
start TIG welding method.
24. 2T/4T welding mode key
：
On TIG or MIG, Pressing the key can choose 2T or 4T
welding mode.

OPERATION
-18-
25. 2T welding mode LED: When the 2T welding mode LED is on ,it can 2T welding
mode,2T is suitable for the short welding.
26. 4T welding mode LED: When the 4T welding mode LED is on ,it can 4T welding
mode, 4T is suitable for the long welding.
§4.2 Welding operation
For example MULTIMIG 500F SYN
§4.2.1 Voltage Setting
You can use the voltage setting knob to set the output voltage before welding.
§4.2.2 Wire speed setting
You can use current setting knob to set the wire speed when the wire speed LED is on. When the current
LED is on, it display the actual output welding current.
§4.3 Welding parameters
Welding current（A）Welding volt（V）
Wire speed
φ0.8 φ0.9 φ
1.0
φ1.2 φ1.6
60A 15～17V 3--4 3--4 2--4
80A 15～18V 4--5 3--5 3--5 2--4
120A 16～20V 6--7 5--8 4--7 3--6 2--6
160A 17～21V 10--12 7--12 6--12 4--9 3--6
200A 17～26V 11--15 9--15 6--11 3--5
250A 20～28V 8--15 4--6
300A 24～32V 11--12 6--7
350A 26～29V 9--14 7--8
400A 28～31V 9--10
450A 30～34V 10--12
500A 33～35V 12--14