WeldCraft WP-20 User manual

ESPAÑOL
OM-225 425D
2012−09
ENGLISH
WP-20
WP-20V
WP-20M
WP-20P
Hand-Held Water-Cooled TIG
(GTAW) Torches
Torches manuelles TIG refroidies
par eau
Antorchas manuales enfriadas
por agua para TIG (GTAW)
File: TIG (GTAW)
Owner’s Manual
Manuel de L’utilisateur
Manual del Operador
FRANÇAIS

TABLE OF CONTENTS
SECTION 1 −SAFETY PRECAUTIONS FOR GTAW TORCHES −READ BEFORE USING 1..............
1-1. Symbol Usage 1........................................................................
1-2. Arc Welding Hazards 1..................................................................
1-3. Proposition 65 Warnings 2...............................................................
1-4. Principal Safety Standards 2.............................................................
1-5. EMF Information 2......................................................................
SECTION 2 −SPECIFICATIONS 3................................................................
2-1. Specifications 3........................................................................
2-2. Duty Cycle 3...........................................................................
SECTION 3 −INSTALLATION 4..................................................................
3-1. Required Torch Parts And Torch Assembly 4................................................
3-2. International Style Connector Assembly 4..................................................
3-3. Connecting Torch 5.....................................................................
SECTION 4 −MAINTENANCE & TROUBLESHOOTING 8...........................................
4-1. Routine Maintenance 8..................................................................
4-2. Troubleshooting 8......................................................................
SECTION 5 −SELECTING AND PREPARING A TUNGSTEN FOR DC OR AC WELDING 11..............
5-1. Selecting Tungsten Electrode (Wear Clean Gloves To Prevent Contamination Of Tungsten) 11.......
5-2. Preparing Tungsten Electrode For Welding With Phase Control Machines 11......................
SECTION 6 −GUIDELINES FOR TIG WELDING (GTAW) 12..........................................
6-1. Positioning The Torch 12..................................................................
6-2. Torch Movement During Welding 13........................................................
6-3. Positioning Torch Tungsten For Various Weld Joints 13........................................
SECTION 7 −PARTS LIST 14.....................................................................

OM-225 425 Page 1
SECTION 1 −SAFETY PRECAUTIONS FOR GTAW
TORCHES −READ BEFORE USING
WC000038 −2011-10
Protect yourself and others from injury — read, follow, and save these important safety precautions and operating instructions.
1-1. Symbol Usage
DANGER! −Indicates a hazardous situation which, if
not avoided, will result in death or serious injury. The
possible hazards are shown in the adjoining symbols
or explained in the text.
Indicates a hazardous situation which, if not avoided,
could result in death or serious injury. The possible
hazards are shown in the adjoining symbols or ex-
plained in the text.
NOTICE −Indicates statements not related to personal injury.
Indicates special instructions.
This group of symbols means Warning! Watch Out! ELECTRIC
SHOCK, MOVING PARTS, and HOT PARTS hazards. Consult sym-
bols and related instructions below for necessary actions to avoid the
hazards.
1-2. Arc Welding Hazards
The symbols shown below are used throughout this manual
to call attention to and identify possible hazards. When you
see the symbol, watch out, and follow the related instructions
to avoid the hazard. The safety information given below is
only a summary of the more complete safety information
found in the welding power source Owner’s Manual. Read
and follow all Safety Standards.
Only qualified persons should install, operate, maintain, and
repair this unit.
During operation, keep everybody, especially children, away.
Always wear dry insulating gloves.
Insulate yourself from work and ground.
Do not touch live electrode or electrical parts.
Before welding, verify torch head is firmly attached to the torch
body.
Do not wrap torch hoses and power cable together with tape or
plastic wire ties. Wrapping restricts water flow which may cause
power cable to overheat and torch hose to burst.
Repair or replace worn, damaged, or cracked torch or cable
insulation.
Turn off welding power source before changing tungsten elec-
trode or torch parts.
Keep all covers and handle securely in place.
ELECTRIC SHOCK can kill.
Arc rays from the welding process produce intense
visible and invisible (ultraviolet and infrared) rays
that can burn eyes and skin. Sparks fly off from the
weld.
Wear an approved welding helmet fitted with a proper shade of
filter lenses to protect your face and eyes from arc rays and
sparks when welding or watching (see ANSI Z49.1 and Z87.1
listed in Safety Standards).
Wear approved safety glasses with side shields under your
helmet.
Use protective screens or barriers to protect others from flash,
glare and sparks; warn others not to watch the arc.
Wear protective clothing made from durable, flame-resistant
material (leather, heavy cotton, or wool) and foot protection.
ARC RAYS can burn eyes and skin.
Keep your head out of the fumes.
Ventilate area, or use breathing device.
Read Material Safety Data Sheets (MSDSs) and manufacturer’s
instructions for material used.
FUMES AND GASES can be hazardous.
BUILDUP OF GAS can injure or kill.
Shut off compressed gas supply when not in
use.
Always ventilate confined spaces or use ap-
proved air-supplied respirator.
Do not weld near flammable material.
Do not weld on containers that have held com-
bustibles, or on closed containers such as tanks, drums, or pipes
unless they are properly prepared according to AWS F4.1 and
AWS A6.0 (see Safety Standards).
Watch for fire; keep extinguisher nearby.
WELDING can cause fire or explosion.
HOT PARTS can burn.
Allow torch to cool before touching.
Do not touch hot metal.
Protect hot metal from contact by others.
NOISE can damage hearing.
Check for noise level limits exceeding those
specified by OSHA.
Use approved ear plugs or ear muffs if noise level is high.
Warn others nearby about noise hazard.
READ INSTRUCTIONS.
Read and follow all labels and the Owner’s
Manual carefully before installing, operating,
or servicing unit. Read the safety information
at the beginning of the manual and in each
section.
Use only genuine replacement parts from the manufacturer.
Perform maintenance and service according to the Owner’s
Manuals, industry standards, and national, state, and local
codes.

OM-225 425 Page 2
1-3. Proposition 65 Warnings
Welding or cutting equipment produces fumes or gases
which contain chemicals known to the State of California to
cause birth defects and, in some cases, cancer. (California
Health & Safety Code Section 25249.5 et seq.)
This product contains chemicals, including lead, known to
the state of California to cause cancer, birth defects, or other
reproductive harm. Wash hands after use.
This product contains or produces a chemical known to the
State of California to cause cancer or birth defects (or other
reproductiveharm). (California Health & Safety Code Section
25249.5 et seq.)
1-4. Principal Safety Standards
Safety in Welding, Cutting, and Allied Processes, ANSI Standard Z49.1,
is available as a free download from the American Welding Society at
http://www.aws.org or purchased from Global Engineering Documents
(phone: [phone], website: www.global.ihs.com).
Safe Practice For Occupational And Educational Eye And Face Protec-
tion, ANSI Standard Z87.1, from American National Standards Institute,
25 West 43rd Street, New York, NY 10036 (phone: [phone], web-
site: www.ansi.org).
Safe Practices for the Preparation of Containers and Piping for Welding
and Cutting, American Welding Society Standard AWS F4.1, from Glob-
al Engineering Documents (phone: [phone], website: www.glo-
bal.ihs.com).
Safe Practices for Welding and Cutting Containers that have Held Com-
bustibles, American Welding Society Standard AWS A6.0, from Global
EngineeringDocuments (phone: [phone],
website: www.global.ihs.com).
National Electrical Code, NFPA Standard 70, from National Fire Protec-
tion Association, Quincy, MA 02269 (phone: [phone], website:
www.nfpa.org and www. sparky.org).
Safe Handling of Compressed Gases in Cylinders, CGA Pamphlet P-1,
from Compressed Gas Association, 14501 George Carter Way, Suite
103, Chantilly, VA 20151 (phone: [phone], website:
www.cganet.com).
Safety in Welding, Cutting, and Allied Processes, CSA Standard
W117.2, from Canadian Standards Association, Standards Sales, 5060
Spectrum Way, Suite 100, Ontario, Canada L4W 5NS (phone:
800-463-6727,website: www.csa-international.org).
Safe Practice For Occupational And Educational Eye And Face Protec-
tion, ANSI Standard Z87.1, from American National Standards Institute,
25 West 43rd Street, New York, NY 10036 (phone: [phone], web-
site: www.ansi.org).
Standard for Fire Prevention During Welding, Cutting, and Other Hot
Work, NFPA Standard 51B, from National Fire Protection Association,
Quincy, MA 02269 (phone: [phone], website: www.nfpa.org.
OSHA, Occupational Safety and Health Standards for General Indus-
try, Title 29, Code of Federal Regulations (CFR), Part 1910, Subpart Q,
and Part 1926, Subpart J, from U.S. Government Printing Office, Super-
intendentof Documents, P.O. Box 371954, Pittsburgh, PA 15250-7954
(phone: [phone]) (there are 10 OSHA Regional Offices—
phone for Region 5, Chicago, is 312-353-2220, website:
www.osha.gov).
1-5. EMF Information
Electric current flowing through any conductor causes localized electric
and magnetic fields (EMF). Welding current creates an EMF field
around the welding circuit and welding equipment. EMF fields may inter-
fere with some medical implants, e.g. pacemakers. Protective meas-
ures for persons wearing medical implants have to be taken. For ex-
ample, restrict access for passers−by or conduct individual risk assess-
ment for welders. All welders should use the following procedures in or-
der to minimize exposure to EMF fields from the welding circuit:
1. Keep cables close together by twisting or taping them, or using a
cable cover.
2. Do not place your body between welding cables. Arrange cables
to one side and away from the operator.
3. Do not coil or drape cables around your body.
4. Keep head and trunk as far away from the equipment in the
welding circuit as possible.
5. Connect work clamp to workpiece as close to the weld as
possible.
6. Do not work next to, sit or lean on the welding power source.
7. Do not weld whilst carrying the welding power source or wire
feeder.
About Implanted Medical Devices:
ImplantedMedical Device wearers should consult their doctor and the
device manufacturer before performing or going near arc welding, spot
welding, gouging, plasma arc cutting, or induction heating operations.
If cleared by your doctor, then following the above procedures is recom-
mended.

ENGLISH
OM-225 425 Page 3
SECTION 2 −SPECIFICATIONS
2-1. Specifications
Model
WP-20 WP-20V WP-20M
Amperage Rating 250 Amps W/Argon Gas At 100% Duty Cycle DCEN; 180 Amps W/Argon Gas At 100%duty Cycle ACHF
Cooling Method Liquid Cooled
Cooling Requirements 1.7 L/min (1.8 qt/min or .45 gal/min)
Tungsten Size .020 Thru 1/8 in. (0.5 Thru 3.2 mm)
Cable Options 12.5 ft (3.8 m) Or 25 ft (7.6 m) Three-Piece Rubber
12.5 ft (3.8 m) Or 25 ft (7.6 m) Three-Piece Vinyl
Dimensions Length: 7 in. (178 mm);
Handle Diameter: .76 in. (19 mm)
Weight: 3.85 oz (109 g)
Length: 7.5 in. (191 mm);
Handle Diameter: .76 in. (19 mm)
Weight: 4.6 oz (130 g)
Length: 6.75 in. (171 mm);
Handle Diameter: .76 in. (19 mm)
Weight: 3.8 oz (108 g)
Model
WP-20P
Ampere Rating 225 Amps W/Argon Gas At 100% Duty Cycle DCEN; 160 Amps W/Argon Gas At 100% Duty Cycle ACHF
Cooling Method Liquid Cooled
Cooling Requirements 1.1 quart/minute (1.0 liter/minute)
Tungsten Size .020 Thru 1/8 in. (0.5 Thru 3.2 mm)
Cable Options 12.5 ft (3.8 m) Or 25 Ft (7.6 m) Three-Piece Rubber
12.5 ft (3.8 m) Or 25 Ft (7.6 m) Three-Piece Vinyl
Dimensions Length: 6.5 in. (165 mm);
Handle Diameter: .76 in. (19 mm);
Weight: 3 oz (85 g)
2-2. Duty Cycle
Continuous Welding sb1.5* 8/93
100% Duty Cycle At 250 Amperes Using Argon Gas w/DCEN For WP-20
And WP-20V and WP-20M Models
Duty Cycle is percentage of 10
minutes that torch can weld at
rated load without overheating.
0
10
Minutes
Definition
100% Duty Cycle At 225 Amperes Using Argon Gas For WP-20P Models
NOTICE −Do not exceed rated amperage or duty cycle (see Section 2-1). Exceeding
rated amperage or duty cycle can damage torch and void warranty.

OM-225 425 Page 4
SECTION 3 −INSTALLATION
3-1. Required Torch Parts And Torch Assembly
WC0202-A
12
1 Cup
2 Collet Body
3 Collet
4 Backcap (Includes O-Ring)
5 Torch Body
6 Handle
7 Water Hose
8 Gas Hose
9 Power Cable
10 Power Cable Adapter
11 International Style Adapter
12 Water Hose For International
Style Adapter
13 Weldcraft QCS (Optional)
Assembling Torch Body
Keep connections tight. Replace
cup, heat shield, and backcap as
needed.
14 Tungsten Electrode (See Sec-
tion 5)
Installing Tungsten
To adjust tungsten position, loosen
backcap.
1
2
3
4
14
5
6
7
8
9
10
11
13
3-2. International Style Connector Assembly
1 Weld Output Cable
2 Insulating Boot
3 Sleeve
Slide insulating boot onto cable;
strip cable and install sleeve.
4 Connector Body
5 Setscrew
Insert cable with sleeve fully into
connector body, tighten setscrew,
and slide insulating boot over con-
nector.
156 496
Tools Needed:
1
2
3
1 in
(26 mm)
3
4
5

ENGLISH
OM-225 425 Page 5
3-3. Connecting Torch
A. Connecting Torch When Using A Freestanding Coolant System
!Turn Off welding power source and
cooling system power before in-
stalling torch.
1 Welding Power Source
2 Regulator/Flowmeter
3 Gas Cylinder
4 Gas Hose (Customer Supplied)
Obtain correct length with 5/8-18 right-hand
fittings.
5 Torch
6 Power Cable Adapter
7 Coolant Hose (Customer Supplied)
Obtain correct length with 5/8-18 left-hand
fittings.
8 Coolant-Out Of Torch/Power Cable
(Red)
Connect coolant-out of torch/power cable
to power cable adapter, and connect adapt-
er to weld output terminal.
9 Torch Gas Hose
10 Coolant-Into Torch Hose (Blue)
11 Cooling System
12 Work Clamp
Connect work clamp to a clean, paint-free
location on workpiece, close to the weld.
Use wire brush or sandpaper to clean weld
joint area.
802 560
Tools Needed:
5/8, 7/8, 1-1/8 in.
5
11
1
7
2
3
4
6
9
10
8
12
If applicable, install high-frequency unit.
B. Connecting Torch To A Dynastyt300 DX Or Maxstar300 DX TIGRunnertUnit

OM-225 425 Page 6
803 311
!Turn Off welding power source
and cooling system power be-
fore installing torch.
1 Gas Hose With 5/8-18 Right-Hand
Fittings (Customer Supplied)
Connections:
2 Regulator/Flowmeter
3 Gas Cylinder
4 Coolant System
5 Torch
6 Coolant-Into Torch Hose (Blue)
7 Torch Gas Hose
8 Coolant-Out Of Torch/Power
Cable (Red)
9 International Style Adapter
Connect coolant-out of torch/power
cable to power cable adapter, and con-
nect adapter to weld output terminal.
10 Work Clamp
Connect work clamp to a clean, paint-
free location on workpiece, close to the
weld.
Use wire brush or sandpaper to clean
weld joint area.
11 Welding Power Source
12 Foot Control
Tools Needed:
5/8, 7/8, 1-1/8 in.
2
3
1
10
5
6
8
11
4
7
9
12

ENGLISH
OM-225 425 Page 7
C. Connecting Torch To A Syncrowave250 DX Or 350 LX w/Integrated Cooler
803 601-B
!Turn Off welding power source
power before installing torch.
1 Gas Hose With 5/8-18 Right-Hand
Fittings (Customer Supplied)
Connections:
2 Gas Cylinder
3 Regulator/Flowmeter
4 Power Source
5 Coolant System
6 Torch
7 Coolant-Into Torch Hose (Blue)
8 Coolant-Out Of Torch/Power
Cable (Red)
Connect torch coolant-out of torch/pow-
er cable to power cable adapter, and
connect adapter to weld output terminal.
9 Torch Gas Hose
10 Work Clamp
Connect work clamp to a clean, paint-
free location on workpiece, close to the
weld.
Use wire brush or sandpaper to clean
weld joint area.
11 Foot Control
Tools Needed:
5/8, 7/8, 1-1/8 in.
4
5
1
3
6
11
8
10
9
7
2

OM-225 425 Page 8
SECTION 4 −MAINTENANCE & TROUBLESHOOTING
4-1. Routine Maintenance
!Disconnect torch before maintaining.
= Check = Change = Clean = Replace
* To be done by Factory Authorized Service Agent
Daily
 Nozzle For Cracks − If Necessary  Check Tungsten Preparation (See Section 5)
Weekly
 Collet For Wear −
 If Necessary  Collet Body Threads −
 If Necessary  Gas Lens Screen −
 If Necessary  Gas Valve, If Applicable −
 If Necessary
Monthly  Power Cable For Cracks,
Wear − If Necessary
 Gas Hose For
Cracks, Leaks, Wear −
 If Necessary
 Water Hose, If Applic-
able, For Cracks, Leaks,
Wear − If Necessary
*
 Back Cap O-Ring −
If Necessary
 Power, Gas, And Water
Cable Connections To En-
sure They Are Tight
 Cable Cover For
Tears, Holes, Or Wear −
 If Necessary
When using a water-cooled torch, maintain cooling equipment according to the manufactures recommendations.
*
4-2. Troubleshooting
Before using troubleshooting table, check selection and preparation of tungsten electrode according to Section 5.
Trouble Remedy
Arc will not start. High frequency present
and visible at the torch. Check cable and work connections. Be sure weld circuit is complete (see Section 3-3).
Check and be sure shielding gas is present.
Lack of high frequency; difficulty in es-
tablishing arc. Select proper size and type tungsten. Properly prepare tungsten according to Section 5.
Check cables and torch for cracks or bad connections. Be sure that torch cables are not close to any
grounded metal. Repair or replace necessary parts.
Check torch consumables. Be sure collet and collet body are correctly installed and tightened (see Sec-
tion 3-1).
Check welding power source High Frequency control, and if necessary, check and adjust spark gaps.
Torch gas valve not working properly (if
applicable). Have Factory Authorized Service Station/Service Distributor check valve.
No shielding gas flow from torch. Be sure valves on gas supply are open.
Check cable for kinks or blockage.
Check and tighten all gas supply fittings.
Check cables and torch for cracked insulation or bad connections. Repair or replace (see Section 4-1).
Tungsten electrode oxidizing and not re-
maining bright after conclusion of weld. Shield weld zone from drafts.
Increase postflow time.
Increase gas flow rate. Check manufacture’s recommendations.
Check and tighten all gas fittings.
Check gas valve and flow meter/regulator.
Select proper size and type tungsten. Properly prepare tungsten (see Section 5).

ENGLISH
OM-225 425 Page 9
Trouble Remedy
Excessive tungsten electrode con-
sumption. Select proper size and type tungsten. Properly prepare tungsten according to Section 5.
Check polarity setting on welding power source (see welding power source Owner’s manual).
Check for proper gas flow rate. Check manufacture’s recommendations.
If torch is water cooled, check torch and cables for water leaks. Repair or replace if necessary (see Sec-
tion 4-1).

OM-225 425 Page 10
Trouble Remedy
Wandering arc Shield weld zone from drafts.
Reduce gas flow rate.
Select proper size and type tungsten. Properly prepare tungsten according to Section 5.
When using AC, check welding power source High Frequency control setting, and increase setting if nec-
essary.
Yellow powder or smoke on cup. Use proper type shielding gas.
Check for proper gas flow rate. Check manufacture’s recommendations.
Increase postflow time.
Check torch cup size. Match cup size to joint being welded.
Erratic arc When using DC, check polarity, and/or polarity of welding cables.
When using AC, check welding power source High Frequency control setting, and be sure it is operating
continuously.
Select proper size and type tungsten. Properly prepare tungsten according to Section 5.
Use proper arc length. Arc length may be too long or too short.
Make sure base material is clean and free of contaminates.
When using AC, slow travel speed can cause erratic arc. Adjust travel speed.
Porosity in weld. Check for proper gas flow rate. Check manufacture’s recommendations.
Check and tighten gas fittings.
Make sure base material and filler material is clean and free of contaminates.
Check for impurities and moisture in gas lines. Purge if necessary.
If torch is water cooled, check torch and cables for water leaks. Repair or replace if necessary (see Sec-
tion 4-1).

ENGLISH
OM-225 425 Page 11
SECTION 5 −SELECTING AND PREPARING A TUNGSTEN
FOR DC OR AC WELDING
gtaw_Phase_2011−06
!Whenever possible and practical, use DC weld output instead of AC weld output.
5-1. Selecting Tungsten Electrode (Wear Clean Gloves To Prevent Contamination Of Tungsten)
Not all tungsten electrode manufacturers use the same colors to identify tungsten type. Contact the tungsten electrode manufacturer or reference
the product packaging to identify the tungsten you are using.
Amperage Range - Gas Type- Polarity
Electrode Diameter (DCEN) −Argon
Direct Current Electrode Negative
(For Use With Mild Or Stainless Steel)
AC −Argon
Balance Control @ 65% Electrode Negative
(For Use With Aluminum)
2% Ceria, 1.5% Lanthanum, Or 2% Thorium Alloy Tungstens
.040” (1 mm) 25-85 20-80
1/16” (1.6 mm) 50-160 50-150
3/32” (2.4 mm) 130-250 135-235
1/8” (3.2 mm) 250-400 225-360
Pure Tungsten
.040” (1 mm) Pure Tungsten Not Recommended
For DCEN −Argon
10-60
1/16” (1.6 mm) 50-100
3/32” (2.4 mm) 100-160
1/8” (3.2 mm) 150-210
Typical argon shielding gas flow rates are 11 to 35 cfh (cubic feet per hour).
Figures listed are a guide and are a composite of recommendations from American Welding Society (AWS) and electrode manufacturers.
5-2. Preparing Tungsten Electrode For Welding With Phase Control Machines
!Grinding the tungsten electrode produces dust and flying sparks which can cause injury and start fires. Use
local exhaust (forced ventilation) at the grinder or wear an approved respirator. Read MSDS for safety infor-
mation. Consider using tungsten containing ceria, lanthana, or yttria instead of thoria. Grinding dust from
thoriated electrodes contains low-level radioactive material. Properly dispose of grinder dust in an environ-
mentally safe way. Wear proper face, hand, and body protection. Keep flammables away.
A. Preparing Tungsten For DC Electrode Negative (DCEN) Welding
Ideal Tungsten Preparation −Stable Arc
2-1/2 Times
Electrode Diameter 1 Grinding Wheel
Grind end of tungsten on fine grit, hard
abrasive wheel before welding. Do not use
wheel for other jobs or tungsten can become
contaminatedcausing lower weld quality.
2 Tungsten Electrode
A 2% ceriated tungsten is recommended.
3 Flat
Diameter of this flat determines amperage
capacity.
4 Straight Ground
Grind lengthwise, not radial.
1
3
4
1 Tungsten Electrode
A pure tungsten is recommended..
2 Balled End
Ball end of tungsten by applying AC amper-
age recommended for a given electrode
diameter(see Section 5-1). Let ball on end of
the tungsten take its own shape.
B. Preparing Tungsten For AC Welding
1 −1-1/2 Times
2
Electrode Diameter
Causes Wandering Arc 2
1
Wrong Tungsten Preparation
Radial Grinding

OM-225 425 Page 12
SECTION 6 −GUIDELINES FOR TIG WELDING (GTAW)
2007−04
6-1. Positioning The Torch
Ref. ST-161 892
!Grinding the tungsten elec-
trode produces dust and fly-
ing sparks which can cause
injury and start fires. Use lo-
cal exhaust (forced ventila-
tion) at the grinder or wear an
approved respirator. Read
MSDS for safety information.
Consider using cerium or
lanthanum based tungsten
instead of thoriated. Tho-
rium dust contains low-level
radioactivematerial. Proper-
ly dispose of grinder dust in
an environmentally safe way.
Wear proper face, hand, and
body protection. Keep flam-
mables away.
1 Workpiece
Make sure workpiece is clean
before welding.
2 Work Clamp
Place as close to the weld as
possible.
3 Torch
4 Filler Rod (If Applicable)
5 Gas Cup
6 Tungsten Electrode
Select and prepare tungsten
according to Section 5.
Guidelines:
The inside diameter of the gas cup
should be at least three times the
tungsten diameter to provide ade-
quate shielding gas coverage. (For
example, if tungsten is 1/16 in
diameter, gas cup should be a
minimumof 3/16 in diameter.
Tungsten extension is the distance
the tungsten extends out gas cup of
torch.
The tungsten extension should be
no greater than the inside diameter
of the gas cup.
Arc length is the distance from the
tungsten to the workpiece.
1
10−25
10−15
6
2
3
4
90
4
5
3/16 in
1/16 in
6
5
Bottom View Of Gas Cup

ENGLISH
OM-225 425 Page 13
6-2. Torch Movement During Welding
ST-162 002-B
Tungsten Without Filler Rod
Tungsten With Filler Rod
Form pool Tilt torch Move torch to front
of pool. Repeat process.
75
75
Welding direction
Form pool Tilt torch Add filler metal
Move torch to front
of pool. Repeat process.
Remove rod
Welding direction 15
6-3. Positioning Torch Tungsten For Various Weld Joints
ST-162 003 / S-0792
75
70
90
20
20
1015
75
20-40
30
15
75
90
15
Butt Weld And Stringer Bead “T” Joint
Lap Joint Corner Joint

OM-225 425 Page 14
SECTION 7 −PARTS LIST
WC0203-A
19
1
2
34
5
6
7
89
10 11
12 13 14 18
20
15
21
22
16
17
25
29
23
24
26
27
28
30
31
32
33
Figure 7-1. Complete Torch Assembly

ENGLISH
OM-225 425 Page 15
Description
Quantity/Model
Stock
No.
Item
No.
Figure 7-1. Complete Torch Assembly
WP20V WP20M WP20PWP20
157N75 Nozzle, Alumina GL LG #6 (3/8 in.) 1 1 1 1.. ..... ....... ............. ....... ...... ......
157N74 Nozzle, Alumina GL LG #8 (1/2 in.) 1 1 1 1.. ..... ....... ............. ....... ...... ......
153N88 Nozzle, Alumina GL LG #10 (5/8 in.) 1 1 1 1.. ..... ....... ........... ....... ...... ......
153N87 Nozzle, Alumina GL LG #12 (3/4 in.) 1 1 1 1.. ..... ....... ........... ....... ...... ......
153N89 Nozzle, Alumina GL Short #15 (15/16 in.) 1 1 1 1.. ..... ....... ....... ....... ...... ......
245V0204S Gas Lens, LG Stubby.. . ....... 0.020−0.040 in. (0.5−1.0 mm) 1 1 1 1........................ ................. ....... ...... ......
245V116S Gas Lens, LG Stubby 1/16 in. (1.6 mm) 1 1 1 1.. .. ....... ......... ....... ...... ......
245V64S Gas Lens, LG Stubby 3/32 in. (2.4 mm) 1 1 1 1.. ... ....... ......... ....... ...... ......
2995795S Gas Lens, LG Stubby 1/8 in. (3.2 mm) 1 1 1 1.. .. ....... .......... ....... ...... ......
313N20L Collet, Gas Lens 0.020 in. (0.5 mm) 1 1 1 1.. ... ....... ............ ....... ...... ......
313N21L Collet, Gas Lens 0.040 in. (1.0 mm) 1 1 1 1.. ... ....... ............ ....... ...... ......
313N22L Collet, Gas Lens 1/16 in. (1.6 mm) 1 1 1 1.. ... ....... ............. ....... ...... ......
313N23L Collet, Gas Lens 3/32 in. (2.4 mm) 1 1 1 1.. ... ....... ............. ....... ...... ......
313N24L Collet, Gas Lens 1/8 in. (3.2 mm) 1 1 1 1.. ... ....... .............. ....... ...... ......
454N63-20 Insulator, Gas Lens LG 1 1 1 1.. .. ....... ....................... ....... ...... ......
553N58 Nozzle, Alumina GL #4 (1/4 in) 1 1 1 1.. ..... ....... ................ ....... ...... ......
553N59 Nozzle, Alumina GL #5 (5/16 in) 1 1 1 1.. ..... ....... ............... ....... ...... ......
553N60 Nozzle, Alumina GL #6 (3/8 in) 1 1 1 1.. ..... ....... ................ ....... ...... ......
553N61 Nozzle, Alumina GL #7 (7/16 in) 1 1 1 1.. ..... ....... ............... ....... ...... ......
553N61S Nozzle, Alumina GL #8 (1/2 in) 1 1 1 1.. ... ....... ................ ....... ...... ......
645V41 Gas Lens, 0.020 in. (0.5 mm) 1 1 1 1.. ..... ....... .................. ....... ...... ......
645V42 Gas Lens, 0.040 in. (1.0 mm) 1 1 1 1.. ..... ....... .................. ....... ...... ......
645V43 Gas Lens, 1/16 in. (1.6 mm) 1 1 1 1.. ..... ....... ................... ....... ...... ......
645V44 Gas Lens, 3/32 in. (2.4 mm) 1 1 1 1
.. ..... ....... ................... ....... ...... ......
645V45 Gas Lens, 1/8 in. (3.2 mm) 1 1 1 1.. ..... ....... .................... ....... ...... ......
7796F74 Nozzle, Lava X-Long #3 (3/16 in.) 1 1 1 1.. .... ....... .............. ....... ...... ......
7796F75 Nozzle, Lava X-Long #4 (1/4 in.) 1 1 1 1.. .... ....... ............... ....... ...... ......
7796F76 Nozzle, Lava X-Long #5 (5/16 in.) 1 1 1 1.. .... ....... .............. ....... ...... ......
7796F77 Nozzle, Lava X-Long #6 (3/8 in.) 1 1 1 1.. .... ....... ............... ....... ...... ......
8796F70 Nozzle, Lava Long #3 (3/16 in.) 1 1 1 1.. .... ....... ................ ....... ...... ......
8796F71 Nozzle, Lava Long #4 (1/4 in.) 1 1 1 1.. .... ....... ................. ....... ...... ......
8796F72 Nozzle, Lava Long #5 (5/16 in.) 1 1 1 1.. .... ....... ................ ....... ...... ......
8796F73 Nozzle, Lava Long #6 (3/8 in.) 1 1 1 1.. .... ....... ................. ....... ...... ......
913N14 Nozzle, Lava #4 (1/4 in.) 1 1 1 1.. ..... ....... ...................... ....... ...... ......
913N15 Nozzle, Lava #5 (5/16 in.) 1 1 1 1.. ..... ....... ..................... ....... ...... ......
913N16 Nozzle, Lava #6 (3/8 in.) 1 1 1 1.. ..... ....... ...................... ....... ...... ......
913N17 Nozzle, Lava #7 (7/16 in.) 1 1 1 1.. ..... ....... ..................... ....... ...... ......
913N18 Nozzle, Lava #8 (1/2 in.) 1 1 1 1.. ..... ....... ...................... ....... ...... ......
913N19 Nozzle, Lava #10 (5/8 in.) 1 1 1 1.. ..... ....... ..................... ....... ...... ......
10 13N08 Nozzle, Alumina #4 (1/4 in.) 1 1 1 1. .... ....... ................... ....... ...... ......
10 13N09 Nozzle, Alumina #5 (5/16 in.) 1 1 1 1. .... ....... .................. ....... ...... ......
10 13N10 Nozzle, Alumina #6 (3/8 in.) 1 1 1 1. .... ....... ................... ....... ...... ......
10 13N11 Nozzle, Alumina #7 (7/16 in.) 1 1 1 1. .... ....... .................. ....... ...... ......
10 13N12 Nozzle, Alumina #8 (1/2 in.) 1 1 1 1. .... ....... ................... ....... ...... ......
10 13N13 Nozzle, Alumina #10 (5/8 in.) 1 1 1 1. .... ....... .................. ....... ...... ......
11 13N25 Collet Body, 0.020 in. (0.5 mm) 1 1 1 1. .... ....... ................ ....... ...... ......
11 13N26 Collet Body, 0.040 in. (1.0 mm) 1 1 1 1. .... ....... ................ ....... ...... ......
11 13N27 Collet Body, 1/16 in. (1.6 mm) 1 1 1 1. .... ....... ................. ....... ...... ......
11 13N28 Collet Body, 3/32 in. (2.4 mm) 1 1 1 1. .... ....... ................. ....... ...... ......
11 13N29 Collet Body, 1/8 in. (3.2 mm) 1 1 1 1. .... ....... .................. ....... ...... ......
12 13N20 Collet, 0.020 in. (0.5 mm) 1 1 1 1. .... ....... ..................... ....... ...... ......
12 13N21 Collet, 0.040 in. (1.0 mm) 1 1 1 1. .... ....... ..................... ....... ...... ......
12 13N22 Collet, 1/16 in. (1.6 mm) 1 1 1 1. .... ....... ...................... ....... ...... ......
12 13N23 Collet, 3/32 in. (2.4 mm) 1 1 1 1. .... ....... ...................... ....... ...... ......
12 13N24 Collet, 1/8 in. (3.2 mm) 1 1 1 1. .... ....... ....................... ....... ...... ......

OM-225 425 Page 16
Description
Stock
No.
Item
No.
Figure 7-1. Complete Torch Assembly (continued)
Quantity/Model
WP20V WP20M WP20P WP20
13 598882 Insulator, Nozzle 1 1 1 1. ... ....... ............................. ....... ...... ......
14 WP-20 Torch Body, 250A W/C 1. ... ....... .......................
15 WP-20V Torch Body, 250A W/C VLV (Includes) 1. .. ....... ....................
20-10N Nut, Hose 1........ ....... .............................................
16 WP-20M Torch Body, 250A W/C (Includes) 1. .. ....... ................................
20-10N Nut, Hose 1........ ....... .....................................................
17 WP-20P Torch Body, 225A W/C 180 Deg 1. .. ....... ..........................................
18 9-4 Insulator, Backcap 1 1 1. ...... ....... ........................... ....... ......
19 VS-2 Knob, Valve 1. ..... ....... ...........................................
20 41V24 Backcap, Long 1 1 1. .... ....... .............................. ....... ......
21 41V35 Backcap, Medium 1 1 1. .... ....... ............................ ....... ......
22 41V33 Backcap, Short 1 1 1. .... ....... .............................. ....... ......
23 53N06 Handle, Knurled Thrd. 1 1. .... ....... ........................ ........................
53N06R Handle, Ribbed Thrd. (Not Shown) 1 1....... ....... ............. ........................
24 H-100 Handle, Knurled 1 1. .... ....... ....................................... ......
H-100R Handle, Knurled (Not Shown) 1 1........ ....... ............................ ......
25 53N04 Clamp, Wire 1 1. .... ....... ................................ ........................
26 45V07 Hose, Water 12.5 Ft (3.8 m) Vinyl 1 1 1 1. .... ....... .............. ....... ...... ......
26 45V07R Hose, Water 12.5 Ft (3.8 m) Rubber 1 1 1 1. .. ....... ............ ....... ...... ......
26 45V08 Hose, Water 25 Ft (7.6 m) Vinyl 1 1 1 1. .... ....... ................ ....... ...... ......
26 45V08R Hose, Water 25 Ft (7.6 m) Braided 1 1 1 1. .. ....... ............. ....... ...... ......
27 45V09 Hose, Gas 12.5 Ft (3.8 m) Vinyl 1 1 1 1. .... ....... ............... ....... ...... ......
27 45V09R Hose, Gas 12.5 Ft (3.8 m) Rubber 1 1 1 1. .. ....... ............. ....... ...... ......
27 45V10 Hose, Gas 25 Ft (7.6 m) Vinyl 1 1 1 1. .... ....... ................. ....... ...... ......
27 45V10R Hose, Gas 25 Ft (7.6 m) Braided 1 1 1 1. .. ....... ............... ....... ...... ......
28 45V03 Cable, Power 12.5 Ft (3.8 m) Vinyl 1 1 1 1. .... ....... ............. ....... ...... ......
28 45V03R Cable, Power 12.5 Ft (3.8 m) Braided 1 1 1 1. .. ....... .......... ....... ...... ......
28 45V04 Cable, Power 25 Ft (7.6 m) Vinyl 1 1 1 1. .... ....... ............... ....... ...... ......
28 45V04R Cable, Power 25 Ft (7.6 m) Braided 1 1 1 1. .. ....... ............ ....... ...... ......
29 WC-3-10 Cover, Cable 10 Ft (3.0 m) 1 1 1 1. . ....... .................... ....... ...... ......
29 WC-3-22 Cover, Cable 22 Ft (6.7 m) 1 1 1 1. . ....... .................... ....... ...... ......
30 45V11 Adapter, Power Cable 1 1 1 1. .... ....... ........................ ....... ...... ......
31 195377 Conn, Water 50mm 1 1 1 1. ... ....... .......................... ....... ...... ......
32 Q5WGT Conn, Qwik 350A 50mm W/C F/T (Includes) 1 1 1 1. .. ....... .... ....... ...... ......
PCA-5-16 Hose, Gas 18 in. (0.2 m) RH 1 1 1 1...... ......... ................ ....... ...... ......
PCA-5-18 Hose, Water 18 in. (0.2 m) LH 1 1 1 1...... ......... ............... ....... ...... ......
33 Q5W Conn, Qwik 350A 50mm W/C (Includes) 1 1 1 1. ..... ....... ........ ....... ...... ......
PCA-5-17 Hose, Water 18 in. (0.2 m) RH 1 1 1 1...... ......... .............. ....... ...... ......
AK-4 Kit, Accessory Thoriated 1 1 1.......... ....... ...................... ....... ......
AK-4C Kit, Accessory Ceriated 1 1 1........ ....... ....................... ....... ......
AK-4A Kit, Accessory Thoriated 1......... ....... .................................................
MAK-1S Kit, Starter 1 1 1....... ....... .................................. ....... ......
OPTIONAL
BE SURE TO PROVIDE MODEL AND STYLE NUMBER WHEN ORDERING REPLACEMENT PARTS.

ENGLISH
Notes

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