Panasonic YT-40MFW User manual

●Thank you for your purchase of Panasonic welding power source.
●Before operating this product, please read the instructions carefully and save this manual for
future use.First of all, please read “Safety precautions” or “Safety manual”.
●SPEC. No.：YT-40MFW2HTF
Panasonic Welding Systems (Tangshan) Co., Ltd.
WTT012TC0PAA01
Operating Instructions
MIG/MAG Welding Gun
Model No. YT-40MFW

CONTENTS
Before using
Ⅰ Warning symbols for safe usage......................................................................I
Ⅱ Safety precautions ............................................................................................. II
Using
1 Caution for using.................................................................................................1
2Preparation for using..........................................................................................2
3connection method ..............................................................................................3
Technical Specifications
4Parts installation method ...................................................................................4
5 Parts list.................................................................................................................6
6Part Drawing.........................................................................................................7
Specifications
7 Specifications ........................................................................................................8
8Packing Details.....................................................................................................9

I
ⅠWarning symbols for safe usage
Each symbol describes things to be observed to prevent you and other personnel from hazardous conditions or damage to
property.
●The followings explains harzardous conditions or damages
that are classi-fied into the following three levels.
●The following symbols indicates things to be observed.
Things that MUST NOT be performed.
A hazardous situations including death or serious personal
injury is imminent.
Things that MUST be performed.
The potential for a hazardous accident including death or
serious personal injury is high.
Things attention must be paid to.
The potential for hazardous accident including light personal
injury and/or the potential for property damage are high.
◆Disclaimer：
Panasonic Welding Systems（Tangshan）Co., Ltd., (hereinafter called “PWST”) and its affiliates (including any
subcontractor, sales company or agent) shall not assume or undertake any responsibility or liability of the followings:
•Any problem arising out of, or directly or indirectly attributable to,the failure of user to carry out those normal maintenance,
normal adjustment and periodical check of this product.
•Any problem arising out of any force majeure, including but not limited to, act of god.
•Any malfunction or defect of this product that is directly or indirectly the result of any malfunction or defect of one or more
related parts or products that are not supplied by PWST. Or any problem arising out of, or directly or indirectly attributable to,
the combination of this product with any other product, equipment, devices or software that is not supplied by PWST.
•Any problem arising out of, or directly or indirectly attributable to,user’s failure to strictly carry out or follow all of the
condition sand instructions contained in this instruction manual, or user’s misusage, mishandle, operational miss or
abnormal operation.
•Any problem arising out of this product or the use of it, the cause of which is other than the foregoing but is also not
attributable to PWST.
•Any claim of a third party that this product infringes the intellectual property rights of such third party that are directly or
indirectly caused by user’s use of this product and relate to the method of production.
●The description of this manual is based on the contents as of Dec. 2020
●The contents of this manual are subject to change without further notice.
●English version is the original instructions.

II
ⅡSafety precautions
Welding power source
Observe the following instructions to
prevent the hazard.
(1)Never use the welding power source for other than
welding purpose. (e.g. Never attempt to use the welding
power source for pipe thawing.)
(2)It is very important to comply with all instructions,
safety warnings, cautions and notes mentioned. Failure
to do so can result in serious injury or even death.
(3)Work of driving source at the input side, selecting work
site, handling, storage and piping of high pressure gas,
storage of welded products and also disposal of waste
should be performed according to the operating
instructions and national, state and local codes and
regulations.
(4)Prevent any unauthorized personnel to enter in and
around the welding work area.
(5)Pacemaker wearers should consult their doctor before
going near arc welding. Magnetic fields can affect
pacemakers.
(6)Only educated and/or skilled persons who well
understand this welding power source should install,
operate, maintain and repair the unit.
(7)Only educated and/or skilled persons who well
understand the operating instructions of the unit and are
capable of safe handling should perform operation of the
unit.
Against electric shock
Observe the following instructions to
prevent the hazard.
(1)Do not touch live parts.
(2)Grounding of the case of the welding power and base
metal or a jig electrically connected to the base metal
must be performed by educated and/or skilled persons.
(3)Before installation or maintenance work, turn off power
at the power box, wait it for at least five minutes to
discharge capacitors. Significant voltage may exist on
capacitors after turning off power at the power box so it
is imperative to check to make sure that no charged
voltage present at capacitors before touching any parts.
(4)Do not use undersized, worn, damaged or bare wired
cables.
(5)Connect cables firm and insulate connection parts.
(6)Keep all cases, panels and covers securely in place.
(7)Do not handle the welding power source with torn or
wet gloves.
(8)Wear safety harness in case of working above floor
level.
(9)Turn off all equipment when not in use.
(10)Perform periodic checks without fail and repair or
replace any damaged parts before using the power
source.
Ventilation and protective equipment
Oxygen deficit, fume and gas
generated during welding can be
hazardous.
(1)When conducting welding in the bottom of the tank,
boiler or hold as well as legally-defined sites, use a local
exhauster specified by the applicable laws and
regulations (occupational safety and health regulation,
rules on preventing suffocation or etc.) or wear
protective breathing gear.
(2)To prevent dust injury or poisoning by the fume
generated during welding, use a local exhauster specified
by the applicable law (occupational safety and health
regulation, rules on preventing injury by inhaled dust or
etc.), or wear protective breathing gear.
(3)When conducting welding in a confined area, make sure
to provide sufficient ventilation or wear protective
breathing gear and have a trained supervisor observe the
workers.
(4)Do not conduct welding at a site where degreasing,
cleaning or spraying is performed. Conducting welding
near the area where any of these types of work is
performed can generate toxic gases.
(5)When welding a coated steel plate, provide sufficient
ventilation or wear protective breathing gear. (Welding
of coated steel plates generates toxic fume and gas.)
Against fire, explosion or blowout
Observe the following cautions to
prevent fires explosion or blowout.
(1)Remove any combustible materials at and near the work
site to prevent them from being exposed to the spatter. If
they cannot be relocated, cover them with a fireproofing
cover.
(2)Do not conduct welding near combustible gases.
(3)Do not bring the hot base metal near combustible
materials immediately after welding.
(4)When welding a ceiling, floor or wall, remove all
flammables including ones located in hidden places.
(5)Properly connect cables and insulate connected
parts. Improper cable connections or touching of
cables to any electric current passage of the base
metal, such as steel beam, can cause fire.
(6)Connect the base metal cable at a section closest to the
welding part.
(7)Do not weld a sealed tank or a pipe that contains a gas.
(8)Keep a fire extinguisher near the welding site for an
emergency.

III
Installing shielding (curtain etc.)
Arc flash, flying spatter, slugs, and noise
generated during welding can damage your
eyes, skin and hearing.
(1)Install a protective curtain around the welding
manipulator site to prevent the arc flash from
entering the eyes of people in the surrounding area.
(2)When welding or monitoring welding, wear safety
glasses with sufficient light blocking structure or
use a protective mask designed for welding
operation.
(3)When welding or monitoring welding wear protective
clothing designed for welding operation, such as
leather gloves, leg cover and leather apron, and also
wear long-sleeve shirts.
(4)Be sure to wear noise-proof protective equipment if
the noise level is high.
(5)The larger the welding current is, or in case of AC
TIG or MIXTIG welding, the larger the AC frequency
is, the larger the arc sound becomes.
Gas cylinder and gas flow regulator
Overturn of gas cylinder and blowout of
gas flow regulator can cause injury.
(1)The gas cylinder must be handled properly according to the
applicable law and in-house standards.
(2)Use the gas flow regulator that is supplied or recom-
mended by our company.
(3)Read the instruction manual of the gas regulator prior to
using it, and observe the cautions in the manual.
(4)Secure the gas cylinder to a dedicated gas cylinder stand.
(5)Do not expose the gas cylinder to high temperature.
(6)When opening the valve of the gas cylinder, do not
bring your face close to the discharge outlet.
(7)When the gas cylinder is not used, be sure to install a
protective cap.
(8)Do not hang the welding torch on the gas cylinder, or
touch the gas cylinder with the electrode.
(9)Do not attempt to disassemble or repair the gas regulator.
Such works require special knowledge.
Rotating parts
Rotating parts can cause injury.
(1)Keep away from rotating parts such as cooling fans，
and feed roller of the wire feeder, or hand, finger(s)，hair
or part of your clothes may be caught by the parts
resulting in injury.
(2)Keep all covers, panels and cases closed when
using the product.
(3)Maintenance work and repair should be perform only by
educated and/or skilled persons who thoroughly understand
welding machines. While
performing maintenance work or repair work, provide fence
or the like around the welding machine so that unauthorized
person can not come close carelessly.
Welding wire
Welding wire, especially wire tip part can
cause injury.
(1)Do not perform inching operation or pull the torch
switch with your eyes, face or body close to the end of
the welding torch - wire extends out from the end of the
welding torch and may stick into the eye, face or body.
(2)In case of using a torch cable with the resin liner,
straighten the torch cable and reduce the preset feed
amount (current) to a half or less before applying the
wire inching.
(3)Performing wire inching while torch cable has been bent
extremely can cause the wire to pierce the resin liner and
cable. Make sure to replace any damaged liner or cable
with a new one, or damaged liner/wire can cause gas
leak or dielectric degradation.
. Against insulation deterioration
Insulation deterioration can cause fire of
welding power source.
(1)Keep enough distance from welding power source
when performing welding or grinding work so as to
prevent spatters or iron particles from getting
into the power source.
(2)Perform check and maintenance work periodically
so as to prevent insulation deterioration due to
accumulated dust or dirt.
(3)When spatters or iron particles get into the welding
power source, turn off the power switches of the
welding power source and power distribution box,
and then blow out.
(4)Make sure to replace any damaged liner or cable
with a new one as use of damaged liner/cable may
cause gas leak or dielectric degradation.
(5)In order to avoid dust and dirt to be collected inside
of the power source, make sure not to leave the
panel and bolts (including eyebolts) open and removed.

1
1Caution for using
1.1 Surrounding environment conditions
Temperature：in use：-10℃～+40℃
In the transport and storage process：-25℃～+55℃；
Humidity：20℃not exceeding 90%；
The torch (gun) should not be used in the rain or under similar weather conditions.
1.2 Cooling Water
In case of a water-cooled torch. Use with cooling-water flow of more than
0.7L/min.Water pressure at the torch entrance is 0.1~0.3MPa for 4m cable
torch. 0.15~0.3MPa for 8m cable torch. Insufficient water flow can cause burn
out of the torch.
● Never use a water-cooled torch for air cooling.
● Never use the Water leaked torch to prevent electrical shocks.
1.3 Cable Hose
Do not bring the hose cable on the hat base metal immediately after welding,
load the heavy material on the cable hose, and bend it by force, It can cause
burn out of the welding torch.
1.4 Welding Operation and Exchange of Parts
Observe the following cautions to prevent burns.
● Do not touch directly the nozzle, electrode and torch body where the temperature rise.
● When welding, wear protective gear such as protective leather gloves designed for welding
operation.
● After turn off the power supply, exchange the torch parts when temperature is lower.
For safety and good welding, exchange any damaged parts for new.
● Be sure to use the parts marked “Panasonic”.
Wear protective glasses to protect the eyes when grinding electrode.
● Follow the standard for safety when using the grinding machine.

2
2 Preparation for using
1. Surrounding environment conditions:
Temperature: When in use: -10℃～+40℃;
During transportation and storage: -25℃～+55℃;
Humidity: no more than 90% at 20°C;
The welding torch (gun) should not be used in rain, snow or similar weather conditions.
2. The distance between the nozzle and the base metal corresponds to the welding current,
please keep a distance of 10-30mm;
3. For slow wire feeding, please straighten the welding gun before operating;
4. Please confirm the relationship between the welding current of this welding gun and the
load duration, and confirm that it must be used within the rated range;
5. Please be sure to install a shunt to use, if there is no shunt, it will cause poor sealing and
poor insulation, please pay special attention;
6. If the hose of the welding gun is bent excessively, it will cause poor wire feeding and
snaking of the welding wire. Please use it as straight as possible. The bending radius shall
not be less than the radius specified in Figure 1.
Figure1

3
3connection method
3.1 Connection of welding gun cable
3.2 Connection of welding torch water pipe
Confirm the installation status of the water supply pipe and drain pipe of the welding torch.
The water supply pipe is connected with the water supply pipe of the cooling water
circulation device, and the drain pipe is connected with the return pipe of the cooling water
circulation device. The inlet pipe and the return pipe are quick-plug structure. The sound
indicates that the connection is in place. At this time, pull back the water supply and drain
pipe to confirm whether it is connected in place. After connection, please reconfirm the
correctness of the water inlet pipe connection.
1. The virtual connection of the water pipe will cause water leakage and cause burns;
2. Incorrect connection of water pipes may cause scalds, torch burns, and even fire and
electric shock;
3. When using in an environment where icing is possible, in order to prevent icing from
damaging the welding torch device, please use antifreeze as the coolant. When it is not
used for a long time, please use compressed air to blow the coolant out from the water
supply port.
1. Please install a long wire feed tube, see 5.1 for the
installation method;
2. Connect the lock nut on the welding torch to the
connection part on the side of the wire feeder, and
tighten it securely to prevent loosening.
1.Before connecting, use an air gun or other tools to
blow off the spatter and welding wire powder on
both sides of the connection. If there is foreign
matter on the power-on surface that affects the
conductive effect, if the conductive surface is
scratched or knocked, please replace it with a new
"connector body", otherwise it will cause a fire due
to the heating of the conductive surface.
2.When connecting, pay attention to confirm the
position of the pin, and make sure that the pin is
inserted into the European connector (wire feeder
side), otherwise it will affect the use effect.
1
Nut
2
Nut
3
Torch switch
4
Connect the body
2
3
4
1
Figure2
Conductor

4
4Parts installation method
4.1 Installation method of wire feeding tube
4.1.1 Resin wire feed tube for welding aluminum
1.Please straighten the cable;
2. Insert the long wire feed tube into the guide
wire tube, remove the contact tip, and confirm
whether the wire feed tube is fully inserted.
After confirming that it is fully inserted, install
the contact tip, adjust the position of the wire
feeding tube clamp, and tighten the wire feeding
tube lock nut by hand to ensure that the wire feeding
tube is fixed. See Figure 3.
3.Then connect the welding torch to the wire feeding device, and tighten the torch lock nut. The wire
feeding tube is generally made longer, as shown on the left in the following figure, it can be cut off at
about L=8mm from the inner end surface of the European connector female seat. See Figure 4.
4.1.2 Wire feeding tube for welding carbon steel
1. Please straighten the welding torch cable;
2. Insert the wire feeding tube into the guide wire
tube;
3. The size of the replacement wire feed tube is
slightly longer. When replacing, cut off a section
at the front end of the welding torch to ensure that the length L of the extension part of the wire feeding
tube is 4~7mm. Tighten the wire feed tube lock nut reliably by hand to ensure that the wire feed tube is
completely inserted into the welding gun. See Figure 5.
The wire feed tube for welded carbon steel is made of high-strength steel wire to form a spring structure.
When inserting it, please pay attention to keep the head, face and other bodies away from the wire feed
tube to prevent the wire feed tube from encountering resistance and rebound, causing the head, face and
other parts Hurt.
4.2 Tip installation method
Unscrew the nozzle and use a wrench to unscrew the old conductive tip. Install the new contact tip and
tighten it with a wrench.
L
1
2
4
1
Nut
2
Wire feed tube
3
Clamp
4
O-ring
L
1
2
1
Nut
2
Wire feed tube
L
Connector
Figure4
Figure3
3
Figure5

5
Please turn off the welding power switch when replacing the tip, nozzle and other parts.
4.3 How to use the current and voltage adjustment buttons
1. Each time you press the current increase or decrease button, the current will increase or decrease by 2A.
Press and hold the current "" or current "-" button for a long time, and the current will continue to increase
or decrease accordingly (as shown in Figure 6);
2. Each time you press the voltage increase or decrease button, the voltage will increase or decrease by
0.2V. Press and hold the voltage "" or voltage "-" button for a long time, and the voltage will increase or
decrease correspondingly (as shown in Figure 6).
Current “-”
Voltage “-”
Current “+”
Voltage “+”
Figure6

6
5Parts list
When replacing parts, please use our genuine parts. If the company’s genuine parts are not used, the
performance of the welding torch will not be fully utilized.
Serial
number
Part Name
Part number
Serial
number
Part Name
Part number
1
Tip1.2A
TET91224
15
Gun handle lock
female
TSMH0134
Tip1.6A
TET91614
16
Ball joint
BD-80063A
2
Tip connector
TSMJ0447
17
Locking spring
TSMB0035
3
Shunt
TSM0S401
18
Cable sheath
TSMZ0255
4
Nozzle
TSM0P408
19
Cable sheath
●XJHT-D25XD28
5
Barrel assembly
TSM0T553
20
Control cable
assembly
TSMW1451
5-1
Screw
R77M4X6
21
Control cable
assemblyA
TSMW4851
5-2
Trachea clamp
TSM12631
22
Wire feed tube
TSM0L520
5-3
Water pipe clamp
TSMJ0004
23
Wire feed tube lock
nut
BG-84300
6
Torch switch
assembly
TSMH0053
24
Junction Box
BG-85260A
7
Handle
●TSMH0135
24-1
Screw
R818M4X6
8
Rubber plug B
TSMZ0446 B
25
Drain pipe
assembly
TSMW6027
9
Button cap
TSMH0148
26
Water pipe sheath
BD-80067
10
Control PCB
TSMP6820
27
Ball joint
BD-80063A
11
Guide wire tube
assembly
TSMD0091
28
Protection spring
TSMB0008
12
Trachea
PVCH4X7k
29
water-cooled joint
components
TSME0026
13
Water-cooled cable
assembly
TSMW4511
(29)
Torch joint
●BG-84121T
(13)
Cable
●TSX-12
30
Torch lock nut
BG-84701
(13)
Cable sheath
●SPT8.2X12K
31
Torch nameplate
WTTNM00015AA
14
Water supply pipe
assembly
TSMW6026
32
Self-tapping screws
R845ST4.2X13F
Note：()means that it is included in this part. ●stands for key materials.

7
6Part Drawing

8
7Specifications
Product number
YT-40MFW
Product Serial Number
YT-40MFW2HTF
Welding current
400A
Rated load
duration
MIG
310A-100%
400A-60%
MAG
358A-100%
400A-80%
CO2
400A-100%
Welding method
MIG/MAG（Including CO2 welding）
Applicable welding wire
Aluminum, stainless steel (carbon steel)
Applicable welding wire diameter
（1.0mm）1.2mm (1.4mm）1.6mm
Applicable gas
CO2 20％CO2＋80％Ar Ar
Cable length
3m
Weight
2.65kg
Barrel shape
R=85 mm
θ= 45°
L=115 mm
Executive standard
EN IEC 60974-7:2019
Rated voltage
DC 113V
Torch switch voltage
DC 24V
Orientation
manual
Adaptive welding power source
YD-500GP5HNX
Adaptive Wire feeder
YW-50DNW1HAG
cooling method
Water cooling
Minimum gas pressure at the inlet
0.10MPa
Maximum gas pressure at the inlet
0.35MPa
Coolant flow
＞1L/min
Maximum pressure of coolant
0.35MPa
Minimum pressure of coolant
0.20MPa
Minimum cooling power required for
welding gun
1.0kW
( ) Refers to the functions that can be achieved by replacing the necessary spare parts
The minimum cooling power in the above table is the value of the required cooling power when the cable is 3m. When the
cable length increases, the required cooling power increases.

9
8Packing Details
Item
Serial number
Quantity
Welding gun
YT-40MFW2HTF
1
Attachment
Wire feed tube
TSM0L520
1
Wire feed tube installation
instructions
TSM80324
1
Tip 1.6
TET91614
1
Manual
TSM50472
1

Panasonic Welding Systems (Tangshan) Co., Ltd.
Add：No.9 Qingnan Road, New & Hi-Tech Development Zone, Tangshan,Hebei, China
Post Code：063020
Tel：[phone]
URL：http://pwst.panasonic.cn/
©Panasonic Welding Systems (Tangshan) Co., Ltd.2020
2020-12
Printed in China
【The standard of the product】
This product is designed and manufactured according to EN IEC 60974-7:2019.
This product may not conform to the local laws and standards of other countries.
Please be absolutely sure to consult with us before attempting to relocate or resell
this product to other countries.
【ATTENTION: The disposal of the product】
In case of disposal of the product, please sign the assignment agreement on
disposal treatment with the authorized organization and then assign the organization
to dispose the product.