Daihen MWP-18 User manual

DAIHEN TIG Welding Torch (MWP-18)
First thoroughly read this
manual to operate the machine
correctly.
•Installation, maintenance, and repair of this
welding machine should be made by qualified
persons or persons who fully understand
welding machines for extra safety.
•Operation of this welding machine should be
made by persons who have knowledge and
technical skill to understand the contents of
this manual well and handle the machine safely
for extra safety.
•Regarding safety education, utilize courses and
classes held by head/branch offices of the
Welding Society/Association and the related
societies/associations and qualifying
examinations for welding experts/consultant
engineers.
•After thoroughly reading this manual first,
store it with the warranty in the place where
the persons concerned can read at any time.
Read it again as occasion demands.
•If incomprehensible, contact our offices. For
servicing, contact our local distributor or sales
representatives in your country. Our
addresses and telephone numbers are listed in
the back cover of this Instruction Manual.
Contents
①NOTES ON SAFETY...........................S1
②IMPORTANT SAFEGUARDS ............S2
③HANDLING PRECAUTIONS .............S6
Operation
1. Specifications .........................................1
2. Standard Incorporated Parts......................3
3. Functions of the Main Parts......................3
4. Changing Tungsten Electrode ..................5
5. Connection on Welding Power Source.....5
6. Requirements............................................6
Maintenance
7. What if the Following Occur....................7
8. Parts List...................................................8
Instruction Manual
= Safety and Operation = Instruction Manual No.
1K2874-E-1

−S1−
1.Notes on Safety
●Before operating this product, you should first thoroughly read this Instruction Manual to operate the
product correctly.
●Precautions in this Instruction Manual are described to prevent you and others from being injured and
suffering loss in your property by having the product operated correctly and safely.
●This welding machine is designed and manufactured in due consideration of safety, but you should
observe the handling precautions described in this Instruction Manual. If you fail to do so, there may
occur an accident resulting in serious injury or death.
●Various ranks of accidents resulting in injury, death or damage may be caused by the mishandling
of devices. The following safety alert symbols and signal words are used throughout this manual to
identify various hazards and special instructions.
DANGER : Mishandling may create seriously dangerous situation that could
cause serious injury or death to personnel. Limited situation of
great urgency.
WARNING : Mishandling may create a dangerous situation that could cause
serious injury or death to personnel.
CAUTION : Mishandling may create a dangerous situation that could cause
medium or slight injury to personnel, or material damage.
Hazards and special instructions identified by CAUTION are very important as well because
neglecting them may occasionally cause serious injury or death to personnel. Do follow the instructions
identified by all three safety alert symbols and signal words because they are all very important.
The meanings of "serious injury", "medium or slight injury" and "material damage" are as follows.
Serious injury ：Injury with a sequela due to a loss of eyesight, injury, burn (high
temperature and low temperature), electric shock, a bone fracture,
poisoning and so on as well as injury that requires hospital
treatment or long treatment as an outpatient.
Medium or slight
injury ：Injury, burn, electric shock and so on that require no hospital
treatment nor long treatment as an outpatient.
Material damage：Damage to property, and direct and incidental / consequential
damage due to the damage to devices.

Ref.: IMPORTANT : IMPORTANT statements identify special instructions necessary
for the most efficient operation.
NOTES ON SAFETY

−S2−
2.Precautions for Safety
2.1 Read, understand, and comply with all safety rules described at the beginning of the
welding power source manual in addition to the following before initiating arc welding
operations.
WARNING ●Observe the following to prevent a serious accident that results in
a serious injury or a death
1) This welding torch is designed and manufactured in due consideration of safety, but you should
observe the handling precautions described in this Instruction Manual. If you fail to do so, there may
occur an accident resulting in a serious injury or a death.
2) Related laws and regulations and your company's standards should be observed in constructing input
power source, selecting an installation area, handling/storing/piping high pressure gas, storing welded
products, and disposing wastes.
3) Keep out of the moving zone of a welding machine and the welding area.
4) A person with a pacemaker should not go near the operating welding machine and the welding area
unless his or her doctor permits. A welding machine generates a magnetic field around it during
powered, and that will have a bad effect on the pacemaker.
5) Installation, maintenance and repair of this welding torch should be done by qualified personnel or
those who fully understand a welding torch for further safety.
6) Operation of this welding torch should be done by personnel who have knowledge and technical skill
to be able to understand the contents of this manual well and to handle the torch safely.
7) This welding torch must not be used for purposes other than welding.
2.2 Observe the following to prevent an electric shock.
WARNING ●Do not touch live electrical parts .
●Touching live electrical parts can cause fatal shock or severe
burns.
1) Only qualified personnel should do the grounding work of the welding power source and a workpiece,
or a workpiece and powered peripheral jigs while abiding by domestic regulations.
2) Do not touch live electrical parts.
3) Always wear dry insulating gloves and other body protection. Do not wear torn or wet gloves and
work clothes.
4) Before doing the installation, inspection, maintenance, etc. of this product, be sure to turn off all the
input power sources and check, several minutes later, that there is no charging voltage since the
condenser and the like may have been recharged.
5) Do not use cables with insufficient capacity, with damage, or with naked conductors.
6) Be sure to tighten the connections of cables and insulate them in order to prevent personnel from
touching those parts easily.
7) DO NOT use a welding machine with its case or cover removed.
8) Secure a firm foothold before initiating work. DO NOT perform work with an unstable foothold or
with a foothold at a height of two meters or above.
9) Make periodic inspection and maintenance. Damaged parts should be repaired before use.
10) Turn off POWER switch when not in use.
IMPORTANT SAFEGUARD

−S3−
2.3 All the personnel in and around the working area including an operator should wear
appropriate protection to protect themselves from arc rays, spatters, slag and noise
produced by welding.
●Install a lightproof wall where arc is generated.
WARNING ●Wear appropriate eye, ear, and body protection.
●Arc rays may cause inflammation of eyes and burns on skin
●Spatter s and slag may cause eye troubles and burns.
●Noise may cause hearing problems.
1) Wear lightproof glasses or a welder’s shield helmet with a proper shade of filter when welding or
watching a welder work.
2) INSTALL ARC PROTECTIVE CURTAINS in between an operator and arc rays.
3) WEAR PROPER SAFETY GLASSES in work area at all times.
4) WEAR PROPER EAR PROTECTION.
5) WEAR PROPER BODY PROTECTION including woolen clothing, flameproof apron and gloves,
leather leggings, high boots and leather arm and shoulder gauntlets.
6) WEAR PROPER SAFETY GLASSES to protect eyes and skin from spatters and slag.
2.4 All the personnel in and around the working area including an operator should wear
appropriate protection to protect themselves from fumes and gases produced by
welding. ●DO NOT inhale fumes and gases generated bywelding.
WARNING ●Ventilate the area sufficiently and wear a welder’s shield mask if
necessary.
●Fumes and gases generated bywelding have a harmful effect on
human body.
●Welding in a small area may cause suffocation due to the lack of
air.
1) KEEP YOUR HEAD out of fumes and DO NOT inhale any.
2) USE FORCED EXHAUST VENTILATION at the arc.
3) VENTILATE the area to prevent build-up of fumes and gases.
4) If ventilation is insufficient, USE APPROVED BREATHING DEVICES.
5) READ AND FOLLOW WARNING LABELS on all containers of welding materials.
6) Before use, READ AND UNDERSTAND the manufacture's instructions, Material Safety Data 
Sheets (MSDSs), and follow your employer's safety practices.
7) To prevent gas poisoning and suffocation, use a local ventilator or a respirator specified by your
country’s domestic laws.
8) Be sure to ventilate the area or wear a respirator by welding in a small place.
A well-trained watchman should observe the work.
9) Do not weld near the place where degreasing, cleaning or spraying is carried out. The heat and rays
of the arc can react with vapors to form highly toxic and irritating gases.
If welding is carried out there, harmful gases may be produced.
10) Toxic fumes and gases are produced when coated steel is welded.
Be sure to ventilate the area sufficiently or use a respirator.
IMPORTANT SAFEGUARD
(continued)

−S4−
2.5 Prevent fire, explosion, burns and injury caused by heated workpiece, spatters, slag,
and arc sparks right after welding as described below.
●Do not weld near flammable materials.
●Watch for fire: keep a fire extinguisher nearby.
●NEVER do welding on inflammables such as a piece of wood or cloth.
WARNING
●Do not weld on closed containers.
●Heated workpiece, spatters, slag and arc sparks right after welding
may cause fire.
●Incomplete cable connections, incomplete contacts in the current
circuit of the workpiece such as steel frames may cause a fire due to
the heat generated when powered.
●Arc generated on containers of inflammables such as gasoline may
cause an explosion.
●Welding of airtight tanks and pipes may cause a bursting.
●Touching a heated workpiece, spatters, slag or arc sparks will
cause a serious burn.
1) KEEP FLAMMBLE MATERIALES out of the robotic cell.
2) Welders should wear appropriate protection such as flameproof leather gloves, work clothes with long
sleeves, a leg cover, a flameproof leather apron in order to prevent burns caused by touching heated
workpiece, spatters, slag and arc sparks right after welding..
3) WATCH for fire.
4) Have a fire extinguisher nearby. Operators should know how to use it.
5) DO NOT touch heated workpiece and peripheral jigs with inflammables such as a piece of wood or cloth.
Doing so might cause not only a fire but also burns.
6) DO NOT put heated workpiece close to inflammables right after welding.
7) Remove inflammables from the place where welding is carried out so that spatters and slag will not
strike them.
8) Do not use inflammable gases near the welding sight.
9) Tighten and insulate the cable connections completely.
10) Connect the cables on the workpiece side as close to the welding area as possible to prevent the welding
current from traveling along unknown paths and causing electric shock and fire hazards.
11) A gas pipe with gas sealed in, an airtight tank and a pipe must not be welded because they might
explode.
12) NEVER do welding on inflammables such as a piece of wood or cloth.
13) When welding a large-size structure such as a ceiling, floor, wall, etc., remove any inflammables hidden
behind a workpiece.
IMPORTANT SAFEGUARD
(continued)

−S5−
P
PP
PRINCIPAL SAFETY STANDARDS
RINCIPAL SAFETY STANDARDSRINCIPAL SAFETY STANDARDS
RINCIPAL SAFETY STANDARDS
Safety in Welding and Cutting, ANSI Standard Z49.1, from American Welding Society.
Safety and Health Standards, OSHA 29 CFR 1910, from Superintendent of Documents,
U.S. Government Printing Office.
Recommended Practices for Plasma Arc Cutting, American Welding Society Standard
AWS C5.2, from American Welding Society.
Recommended Safe Practices for the Preparation for Welding and Cutting of Containers
That Have Held Hazardous Substances, American Welding Society Standard AWS F4.1,
from American Welding Society.
National Electrical Code, NFPA Standard 70, from National Fire Protection Association.
Safe Handling of Compressed Gases in Cylinders, CGA Pamphlet P-1, from Compressed
Gas Association.
Code for Safety in Welding and Cutting, CSA Standard W117.2, from Canadian Standards
Association, Standards Sales.
Safe Practices For Occupation And Educational Eye And Face Protection, ANSI Standard
Z87.1, fromAmerican National Standards Institute.
Cutting And Welding Processes, NFPA Standard 51B, from National Fire Protection
Association.

−S6−
3.Handling Precautions
3.1 Coolant
CAUTION ●Be sure to keep the flow of coolant at more than 1 liter per minute.
(Water pressure of more than 0.1 to 0.3 MPa is required at a torch
inlet). Insufficient flow of coolant may damage a welding torch.
●NEVER apply air-cooling.
●NEVER use a welding torch that had a water leak because doing so might cause an electric
shock.
3.2 Cable Hose
CAUTION ●Never let cable hoses touch any heated part of the welded, put
something heavy on top nor bend them excessively because the
welding torch might become damaged.
3.3 Replacement of Parts
CAUTION ●To prevent burns, observe the following.
●Do not directly touch the high-temperature parts of a nozzle, an electrode and so on.
● When welding, wear suitable protection such as leather gloves for welding.
● Do not replace torch tip elements before they cool off.
CAUTION ●If any parts are damaged, replace them with new ones for further
safety and better quality.
● Be sure to place an order for replacement at our sales office or our agency.
CAUTION ●Wear protective glasses for eye protection when grinding an electrode.
●Follow safety instructions of a grinder or an electrode grinder when grinding an electrode.
HANDLING PRECAUTIONS

– 1 –
Note 1: The contents of this instruction manual are subject to change without prior notice.
2: We do our best not to have any misprint or error in this manual. However, when we do
have them, we are not responsible for any problems or consequences arisen from them.
3: We prohibit whole or a part of this manual to be copied without permission.
1.Specifications
Torch MWP-18 is for automatic TIG welding, thus used for welding with AC (a high-frequency
superimposition) or DC (Mainly a negative electrode).
Specifications are described in Table 1.
Table 1 Specifications (See Figure 1)
Type MWP-18
Welding method TIG welding
DC (positive
electrode) 300A
Max.
applicable
current AC 260A
Rated duty cycle 100%
Electrode in use (
φ
1.0) (
φ
1.6) (
φ
2.4)
φ
3.2
Materials of electrode Ceriated tungsten
(Thoriated tungsten, pure tungsten)
Cooling method Water cooling
Torch shape Pencil shape
Cable length 6 m
Note: Options need to be purchased for the electrode sizes in parenthesis.
This instruction manual describes the operation and maintenance of TIG Welding Torch
MWP-18. Read and understand the entire contents of this manual before use to be able
to handle the torch properly. Before operating the torch, be sure to read OPERATION.
Operation

– 2 –
Fig. 1. General View of MWP-18 TIG Welding Torch
•GasHose
38
24.521.5
5255(260)
173.5(178.5)
φ
25
542(47) 125.5
(
φ
11
〜
)
φ
17
(
φ
17.2)
φ
24
3/8-24 UNF
3/8-24 UNF
7/16-20 UNF
7/8-14 UNF
9/16-18 UNF
5/8-18 UNF
• Coolant Hose
• Condensing Hose • Power Cable
Works as both
Fig. 1 Outline drawing of MWP-18 TIG Welding Torch

– 3 –
2.Standard Incorporated Parts
Make sure that the following are incorporated when unpacked.
Table 2 Standard Incorporated Parts
Name Part No. Quantity Remarks
Collet (3.2) H21B17 1
Insulator H21B60 1 For gas lens
Lea collet (3.2) H561C05 1
“O” ring (P.12) 3572-012 1 JISB2401P12
(Silicon rubber)
Nozzle (No.8) H21B44 1
Ceriated tungsten
electrode 0870-032 1
φ
3.2 ×150mm
Note: The above are standard specifications. We have a wide selection of optional parts so that you can
do a wide range of welding by replacing the replaceable part with a respective option.
For more details, see PARTS LIST on pp.8.
3.Functions of the Main Parts
3.1 Tungsten Electrode
Ceriated tungsten electrode (2% cerium contained,
φ
3.2 ×150mm) is incorporated for standard
specifications. See pp.8 for tungsten electrode with other diameter.
3.1.1 Selection of Electrode
Ceriated tungsten (2% cerium contained, gray mark), thoriated tungsten (2 % thorium contained, red
mark) and pure tungsten (white mark) are commonly used as tungsten electrode.
Table 3 Selection of Electrode
Welding method
(power source) Materials of electrode Materials of wokpiece
DC TIG welding Ceriated tungsten (2% cerium contained)
Thoriated tungsten (2% thorium contained)
Stainless steel, mild steel, brass,
high carbon steel, cast iron,
copper, titanium, silver
AC TIG welding Ceriated tungsten (2% cerium contained) Pure tungsten
Thoriated tungsten (2% thorium contained)
Aluminum, aluminum casting,
magnesium, magnesium casting
Note: The table above lists only typical electrode and workpiece materials.
3.1.2 Selection of Electrode Diameter
Apply welding current within the range specified in Table 4 according to electrode diameter
Table 4 Relationship between Electrode Diameter and Welding Current
Welding current (A)
DC TIG welding (negative electrode) AC TIG welding
Electrode
diameter
mm
φ
Ceriated
tungsten Thoriated tungsten Ceriated tungsten Pure tungsten Thoriated tungsten
1.0 – 1 – 80 – 10 – 60 20 – 80
1.6 5 – 150 5 – 150 40 – 130 20 – 100 40 – 130
2.4 20 – 250 20 – 250 70 – 220 50 – 160 70 – 220
3.2 50 – 400 50 – 400 110 – 290 100 – 210 110 – 290
Note: This table describes the standard ranges of welding current that differ according to electrode
diameter.

– 4 –
3.2 Selection of Collet, Collet Body
A collet and a collet body are for feeding and holding electrode. They are divided into two kinds
depending on whether they have gas lenses. (Ones for gas lenses are incorporated as standards.)
Moreover, they are divided into four kinds depending on the electrode diameter to be used with, thus
use a right collet and a collet body according to electrode diameter.
3.3 Selection of Nozzle
In order to have a sufficient shielding effect of argon gas, see Table 5 and use a right nozzle according
to welding current.
Nozzles have good electric insulation, and they especially have excellent shock-resistance and
heat-resistance.
The relationship between welding current and nozzle diameter is described in Table 5, and the
relationship between nozzle No. and inside diameter in Table 6.
Table 5 The Relationship between Welding Current and Nozzle Diameter
DC welding AC welding
Welding
current (A) Nozzle No. Gas flow rate Nozzle No. Gas flow rate
10 – 100 4, 5, 6 4 – 5 liter / min 5, 6 6 – 8 liter / min
101 – 150 4, 5, 6 5 – 7 liter / min 6, 7 7 – 10 liter / min
151 – 200 4, 5, 6, 7, 8 6 – 8 liter / min 7, 8 7 – 10 liter / min
201 – 300 5, 6, 7, 8 8 – 9 liter / min 8, 10, 12 8 – 15 liter / min
Table 6 The Relationship between Nozzle No. and Inside Diameter
Nozzle No. 4 5 6 7 8 10 12
Inside diameter (mm) 6.5 8 9.5 11 12.7 16 19
3.4 Nozzle for Gas Lens
When a fluid flows inside a tube, the bigger the value of L/D is,
the easier it is to obtain the streamline flow.
(L: length of a tube, D: diameter of a tube)
Gas lens has this logic applied.
●As gas is spouted from a nozzle in a streamline flow, it has
good shield effect.
●Even a small gas flow rate brings about sufficient shield effect.
●As the length of the tip of tungsten is adjustable, more space between a nozzle and a workpiece can
be obtained. That makes it easier for personnel to observe arc and the working area well.
Moreover, welding in a narrow area will be feasible.
●The productivity will rise and the damage to a nozzle will be far reduced. Therefore, a gas nozzle is
very useful in high-quality or complicated welding.
∗ When you do not use a nozzle for a gas lens, you do not need No. 3: Insulator (H21B60) in the Parts
List on pp.8.
Gas lens controls the flow of shield gas at a uniform pace.
Gas lens has the following advantages.
This length is
adjustable.
5 to 7 times longer
than usual

– 5 –
4.Changing Tungsten Electrode
(From
φ
3.2 to
φ
1.6)
4.1 Parts Necessary for
φ
1.6
●Tungsten electrode (
φ
1.6 – 150 mm)
●Collet body (for
φ
1.6) Oneseteach
●Collet (for
φ
1.6)
●Lea collet (for
φ
1.6)
4.2 How to Change
●Remove a set screw and take out a lea collet.
●Loosen a lea collet body by turning its head and remove a nozzle, a collet body, a tungsten electrode
and a collet.
●Insert a tungsten electrode (
φ
1.6) into a collet (for
φ
1.6) prepared, and then screw that into a collet
body (for
φ
1.6).
DO NOT forget to change an insulator as well when changing a collet body from
φ
3.2 to
φ
1.6.
●Screw a nozzle into a collet body.
●Insert a lea collet (for
φ
1.6) into a lea collet body.
●Adjust the length of the part of a tungsten electrode that is sticking out according to the shape of the
welded and the location to be welded.
●As soon as the length to be stuck out is decided, tighten the head of a lea collet body and mount a set
screw.
Fig. 2
CAUTION ●Make sure to tighten a collet body and a torch body firmly. If
either of them is loose even slightly, a collet might be burned and
seized up or an operator might get burn due to the heat-up.
CAUTION ●Stick out an electrode 5 to 10 mm from the tip of a nozzle. If the
tip of the electrode is located inside the nozzle, the nozzle might
become damaged due to the arc heat-up.
5.Connection to Welding Power Source
CAUTION ●Tighten each connection firmly. If there is any loosened part, fire or
burn might be caused due to the heat-up.
●Refer to an instruction manual for each welding power source, and connect a torch properly.
Thoriated Tungsten Electrode
Collet Body
Insulator
Set Screw
Lea Collet
Lea Collet Body
Torch Body
Collet
Nozzle

– 6 –
6.Requirements
6.1 When mounting this torch onto a robot, connect a lead cable bundled with a power
cable to the connection part of the workpiece-side welding cable on the welding power
source.
6.2 If there is any loosened part in every connection of a torch, heating, a water leak or a
gas leak might occur. Make sure to tighten the connections sufficiently.
6.3 Keep a gas flow rate at 7 – 8 liter / min for AC and 5 – 6 liter / min for DC for normal
operations. When a gas lens is in use, sufficient shield effect will be obtained at a
lower rate. When it is windy, or a workpiece and a torch need to be moved farther
away from each other, raise the flow rate at the appropriate times.
6.4 Keep the flow rate of coolant at more than 1.2 liter / min. 1.2 – 1.5 kg / cm2is
appropriate for water pressure. DO NOT use with water pressure of more than 3 kg /
cm2. Lower than 25ºC is desirable for the temperature at the inlet.
6.5 Although a cable hose, a gas hose and a coolant hose are all protected by hose
sheaths, DO NOT put anything heavy on top, let them touch heated parts of the
welded, nor bent them by force.
6.6 Always keep a tungsten electrode clean.
1) When spatters stick to an electrode:
Generate arc on other steel plate, and it will be cleaned.
2) When the tip of an electrode makes a tiny spherical shape:
Sharpen the tip by a grinder and so on to form acute angles.
3) When an electrode sticks into the molted pool:
Turn off POWER, take out the electrode and break it at the lowermost part of the tip.
Then, fix the tip of the electrode with a grinder and so on.
6.7 Keep a nozzle clean as well. Remove its cap occasionally and check whether there
is any abnormality.
6.8 Even when an abnormality cannot be observed from outside, doing periodic inspection
to check out the wearing out of parts is desirable for maintaining a touch in a good
shape and obtaining fine results of welding.

– 7 –
7.What if the Following Occur
Trouble Probable causes
1. The connections of welding cable of a torch and a
workpiece are incomplete.
2. The fuse of a control unit has blown.
3. Electromagnetic contactor does not work.
4. Argon gas has not flowed.
No arc generated
5. A high frequency has not been generated.
1. The length of an arc is too short.
Electrode damaged 2. The flow rate of an argon gas is not enough.
1. The welding current is too large in proportion to the
diameter of an electrode.
Electrode melted 2. The polarity of an electrode is wrong.
1. Coolant has not flowed enough.
Torch body heated 2. The tightened parts became loose.
Maintenance

– 8 –
8.Parts List
When parts of a torch are worn out or damaged, refer to Figure 3 and Table 6 and place an order for
replacement at our sales office or our agency. Be sure to leave the name and part No. or specification
when placing an order.
Table 7 Parts List

No PART No Description Q'ty Remarks
1 K2874B Torch body 1
2 H561E Lea collet body 1
3 H21B60 Insulator 1 For gas lens
4 H21B17 Collet (3.2) 1
5 H21B14 Collet (1.0) (1) Optional
6 H21B15 Collet (1.6) (1) Optional
7 H21B16 Collet (2.4) (1) Optional
8 H21B54 Collet body (3.2) 1
9 H21B51 Collet body (1.0) (1) Optional
10 H21B52 Collet body (1.6) (1) Optional
11 H21B53 Collet body (2.4) (1) Optional
12 H21B09 Collet body (1.0) (1) Optional
13 H21B10 Collet body (1.6) (1) Optional
14 H21B11 Collet body (2.4) (1) Optional
15 H21B12 Collet body (3.2) (1) Optional
16 H561C05 Lea collet (3.2) 1
17 H561C02 Lea collet (1.0) (1) Optional
18 H561C03 Lea collet (1.6) (1) Optional
19 H561C04 Lea collet (2.4) (1) Optional
20 0870 ｰ032 Ceriated tungsten electrode 1
φ
3.2×150mm
22 0870 ｰ016 Ceriated tungsten electrode (1)
φ
1.6×150mm
23 0870 ｰ024 Ceriated tungsten electrode (1)
φ
2.4×150mm
24 H21B44 Nozzle (No.8) 1
25 H21B40 Nozzle (No.4) (1) Optional
26 H21B41 Nozzle (No.5) (1) Optional
27 H21B42 Nozzle (No.6) (1) Optional
28 H21B43 Nozzle (No.7) (1) Optional
29 H21B19 Nozzle (No.4) (1) Optional
30 H21B20 Nozzle (No.5) (1) Optional
31 H21B21 Nozzle (No.6) (1) Optional
32 H21B22 Nozzle (No.7) (1) Optional
33 H21B23 Nozzle (No.8) (1) Optional
34 H21B24 Nozzle (No.10) (1) Optional
35 H21B25 Nozzle (No.12) (1) Optional
36 3572 ｰ012 "O" ring (P12) 1 JIS B 2401 P12 (silicon rubber)
37 H472E04 Set screw 1
38 H662C Gas hose assy 1
39 H662D Coolant hose assy 1
With gas lens
Without gas lens
Optional
For gas lens
Without gas lens

– 9 –
Table 7 Parts List (Continued)
No PART No Description Q'ty Remarks
40 H662B Power cable hose assy 1
41 H662E Hose sheath 1
42 0831-010 Thoriated tungsten electrode (1)
φ
1.0×150mm ground optional
43 0831-016 Thoriated tungsten electrode (1)
φ
1.6×150mm ground optional
44 0831-024 Thoriated tungsten electrode (1)
φ
2.4×150mm ground optional
45 0831-032 Thoriated tungsten electrode (1)
φ
3.2×150mm ground optional
46 0831-010 Pure tungsten electrode (1)
φ
1.0×150mm ground optional
47 0831-016 Pure tungsten electrode (1)
φ
1.6×150mm ground optional
48 0831-024 Pure tungsten electrode (1)
φ
2.4×150mm ground optional
49 0831-032 Pure tungsten electrode (1)
φ
3.2×150mm ground optional

– 10 –
Fig. 3. MWP-18 TIG Welding Torch Parts Layout

Instruction Manual of welding torch
No. 1 K2874-E-1 First edition first printed on 21 January,1999

ITEMS OF MAIN PRODUCTS
ARC WELDING MACHINES
AC ARC WELDING MACHINES
DC ARC WELDING MACHINES
CO2GAS-SHIELDED ARC WELDING MACHINES
MAG ARC WELDING MACHINES
MIG ARC WELDING MACHINES
TIG GAS-SHIELDED ARC WELDING MACHINES
SUBMERGED ARC WELDING MACHINES
NO-GAS-SHIELDED ARC WELDING MACHINES
STUD WELDING MACHINES
AIR PLASMA CUTTING MACHINES
ARC WELDING ROBOT
CO2LASER EQUIPMENTS
Printed in Japan
DAIHEN, Inc.
DAIHEN
DAIHENDAIHEN
DAIHEN Corporation DYNAMIC ROBOTICS DIVISION
5
55
5-
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-1, Minami Senrioka, Settsu,
1, Minami Senrioka, Settsu,1, Minami Senrioka, Settsu,
1, Minami Senrioka, Settsu, 761 Crossroads Court,
761 Crossroads Court,761 Crossroads Court,
761 Crossroads Court,
Osaka 566
Osaka 566Osaka 566
Osaka 566-
--
-0021, JAPAN
0021, JAPAN0021, JAPAN
0021, JAPAN Vandalia, OH 45377, U.S.A.
Vandalia, OH 45377, U.S.A.Vandalia, OH 45377, U.S.A.
Vandalia, OH 45377, U.S.A.
Phone
PhonePhone
Phone : +81
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-6
66
6-
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-6317
63176317
6317-
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-2506
25062506
2506 Phone
PhonePhone
Phone : +1
: +1: +1
: +1-
--
-937
937937
937-
--
-454
454454
454-
--
-9660
96609660
9660
Facs
FacsFacs
Facs : +81
: +81: +81
: +81-
--
-6
66
6-
--
-6317
63176317
6317-
--
-2583
25832583
2583 Facs
FacsFacs
Facs : +1
: +1: +1
: +1-
--
-937
937937
937-
--
-454
454454
454-
--
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96619661
9661
DAIHEN EUROPE GmbH. DAIHEN ASIA（THAILAND）CO.,LTD
Broichhofstrasse 7,
Broichhofstrasse 7,Broichhofstrasse 7,
Broichhofstrasse 7, 60/86 Mu 19,
60/86 Mu 19,60/86 Mu 19,
60/86 Mu 19,
40882 Ratingen 1,
40882 Ratingen 1,40882 Ratingen 1,
40882 Ratingen 1,
NavanakornIndustrial EstatePhase 3.
Navanakorn Industrial EstatePhase3.Navanakorn IndustrialEstate Phase3.
Navanakorn Industrial EstatePhase3.
F. R. GERMANY
F. R. GERMANYF. R. GERMANY
F. R. GERMANY Klong Nueng, Klong Luang,
Klong Nueng, Klong Luang,Klong Nueng, Klong Luang,
Klong Nueng, Klong Luang,
Phone
PhonePhone
Phone : +49
: +49: +49
: +49-
--
-2102
21022102
2102-
--
-444007
444007444007
444007
Pathumtha
PathumthaPathumtha
Pathumthani 12120, THAILAND
ni 12120, THAILANDni 12120, THAILAND
ni 12120, THAILAND
Face
FaceFace
Face
:+49
:+49:+49
:+49-
--
-2102
21022102
2102-
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-472100
472100472100
472100 Phone
PhonePhone
Phone : +66
: +66: +66
: +66-
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-5292130
52921305292130
5292130
Face
FaceFace
Face : +66
: +66: +66
: +66-
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-5292132
52921325292132
5292132