ESAB ST-21M Mig Welding Torch Troubleshooting instruction

Brand: ESAB

Model: ST-21M Mig Welding Torch

Type: Troubleshooting instruction

INSTRUCTIONS for

F-11-964-H

January, 2016

Be sure this information reaches the operator.

You can get extra copies through your supplier.

ST-21M MIG WELDING TORCH

P/N 690509

These INSTRUCTIONS are for experienced operators. If you are not fully familiar with the principles of operation and safe prac-

tices for arc welding equipment, we urge you to read our booklet, “Precautions and Safe Practices for Arc Welding, Cutting,

and Gouging”, Form 52-529. Do NOT permit untrained persons to install, operate, or maintain this equipment. Do NOT attempt

to install or operate this equipment until you have read and fully understand these instructions. If you do not fully understand

these instructions, contact your supplier for further information. Be sure to read the Safety Precautions on page 2 before

installing or operating this equipment.

I. INTRODUCTION

The ST-21M (P/N 690509) is a liquid-cooled, in-line body

style, machine torch designed exclusively for mecha-

nized mig welding installations. The current carrying

capacity of this torch is 600 amperes continuous duty,

using all types of welding wire in sizes ranging from .030

inches (0.8 mm) through 7/64-inch (2.8 mm) diameters,

including ux cored wires.

The torch can be mounted directly to an EH-10A welding

head, and can be easily adapted for remote mounting.

The ST-21M is attached to the welding head by means

of an accessory mounting adaptor. To facilitate maneu-

verability and installation xturing, all service lines are

internally connected to the torch body and exit from the

rear of the torch barrel.

The torch is designed for use with either threadless

type contact tubes which are secured by a collet nut,

or threaded contact tips (see Table 2). The threadless

contact tube can be quickly and easily replaced by un-

screwing the metal nozzle and collet nut (in that order),

and then slipping the contact tube out. The threaded

tips can be replaced by removing the metal nozzle and

unscrewing the tip. Six metal nozzles (one for spot

welding use) are available for use with this torch (see

Table 1). Nozzle sizes 8 and 10 require a spatter liner.

NOTE: Due to the high electrical conductivity, use of tap

water or commercial anti-freeze is NOT recom-

mended for torch cooling. Use of the a coolant

circulator using a specially formulated torch

coolant (P/N 0560950312, 1 gal. container) is

recommended for torch cooling. The coolant

also provides anti-freeze protection down to

-34° F.

II. ACCESSORY EQUIPMENT

A. REQUIRED EQUIPMENT

1. Torch Mounting Bracket, P/N 633885. The bracket

includes as insulator sleeve which insulates the torch

from the welding head. See Figs. 1 and 2.

2. Nozzle and Wire Feed Accessories. The ST-21M

also requires a nozzle, a nozzle spatter liner, and

several wire feed accessories (contact tube or tip,

liner, and inlet guide tip) of the proper size for the wire

being used. These accessories are listed in Tables 1

and 2 following.

3. Service Line Connections and Extensions. De-

pending on mounting arrangements or welding head

to be used, there are several methods for connecting

the torch service lines to the gas, coolant, and power

supplies (see Fig. 4).

a. Connection block assembly (P/N 58V74) is avail-

able for mounting on the EH-10A welding head.

b. The following service lines and couplings are avail-

able:

Coolant Hose, 3-ft....................................................... 20634

Coolant Hose, 12-1/2-ft. .............................................40V76

Coolant Hose, 25-ft................................................... 406196

Gas Hose, 3-ft. ........................................................... 31504

Gas Hose, 12-1/2-ft. ...................................................40V77

Gas Hose, 25-ft. .........................................................34V38

Power Cable, 12-1/2-ft................................................40V78

Coolant Hose Coupling...............................................11N18

Gas Hose Coupling ....................................................11N17

Power Coolant Out Coupling ...................................... 11N19

Power Cable Adaptor.................................................. 45V11

Coolant Adaptor (connects hose to 1/4-in. NPT) ........ 11N16

4. Welding Head Accessories. Two other accessories

whose selection depends upon wire size and type,

are the feed roll and inlet guide insert on the welding

head. Selection of these accessories is covered in

the instruction booklet supplied with the welding head.

Mounting bracket, Part No. 996497, can be used to

mount an EH-10 to adjustable slide P/N 25V39 (Fig.

2) or to user designed set-up.

WARNING: These Safety Precautions are for your

protection. They summarize precautionary infor-

mation from the references listed in Additional

Safety Information section. Before performing any

installation or operating procedures, be sure to read and follow

the safety precautions listed below as well as all other manuals,

material safety data sheets, labels, etc. Failure to observe Safety

Precautions can result in injury or death.

PROTECT YOURSELF AND OTHERS -- Some welding, cutting,

and gouging processes are noisy and re-

quire ear protection. The arc, like the sun,

emits ultraviolet (UV) and other radiation

and can injure skin and eyes. Hot metal

can cause burns. Training in the proper

use of the processes and equipment is essential to prevent

accidents. Therefore:

1. Always wear safety glasses with side shields in any work area,

even if welding helmets, face shields, and goggles are also

required.

2. Use a face shield tted with the correct lter and cover plates

to protect your eyes, face, neck, and ears from sparks and rays

of the arc when operating or observing operations. Warn by-

standers not to watch the arc and not to expose themselves

to the rays of the electric-arc or hot metal.

3. Wear ameproof gauntlet type gloves, heavy long-sleeve

shirt, cuess trousers, high-topped shoes, and a welding

helmet or cap for hair protection, to protect against arc rays

and hot sparks or hot metal. A ameproof apron may also be

desirable as protection against radiated heat and sparks.

4. Hot sparks or metal can lodge in rolled up sleeves, trouser

cus, or pockets. Sleeves and collars should be kept buttoned,

and open pockets eliminated from the front of clothing

5. Protect other personnel from arc rays and hot sparks with a

suitable non-ammable partition or curtains.

6. Use goggles over safety glasses when chipping slag or grind-

ing. Chipped slag may be hot and can y far. Bystanders should

also wear goggles over safety glasses.

FIRES AND EXPLOSIONS -- Heat from ames and arcs can

start res. Hot slag or sparks can also cause res and explo-

sions. Therefore:

1. Remove all combustible materials

well away from the work area or cover the

materials with a protective non-ammable

covering. Combustible materials include wood,

cloth, sawdust, liquid and gas fuels, solvents,

paints and coatings, paper, etc.

2. Hot sparks or hot metal can fall through cracks or crevices in

oors or wall openings and cause a hidden smoldering re

or res on the oor below. Make certain that such openings

are protected from hot sparks and metal.“

3. Do not weld, cut or perform other hot work until the workpiece

has been completely cleaned so that there are no substances

on the workpiece which might produce ammable or toxic

vapors. Do not do hot work on closed containers. They may

explode.

4. Have re extinguishing equipment handy for instant use,

such as a garden hose, water pail, sand bucket, or portable

re extinguisher. Be sure you are trained in its use.

5. Do not use equipment beyond its ratings. For example, over-

loaded welding cable can overheat and create a re hazard.

SAFETY PRECAUTIONS

10/98

6. After completing operations, inspect the work area to make

certain there are no hot sparks or hot metal which could cause

a later re. Use re watchers when necessary.

7. For additional information, refer to NFPA Standard 51B, "Fire

Prevention in Use of Cutting and Welding Processes", available

from the National Fire Protection Association, Batterymarch

Park, Quincy, MA 02269.

ELECTRICAL SHOCK -- Contact with live electrical parts and

ground can cause severe injury or death. DO NOT use AC

welding current in damp areas, if movement is conned, or if

there is danger of falling.

1. Be sure the power source frame

(chassis) is connected to the ground system of

the input power.

2. Connect the workpiece to a good

electrical ground.

3. Connect the work cable to the workpiece. A poor or missing

connection can expose you or others to a fatal shock.

4. Use well-maintained equipment. Replace worn or damaged

cables.

5. Keep everything dry, including clothing, work area, cables,

torch/electrode holder, and power source.

6. Make sure that all parts of your body are insulated from work

and from ground.

7. Do not stand directly on metal or the earth while working

in tight quarters or a damp area; stand on dry boards or an

insulating platform and wear rubber-soled shoes.

8. Put on dry, hole-free gloves before turning on the power.

9. Turn o the power before removing your gloves.

10. Refer to ANSI/ASC Standard Z49.1 (listed on next page) for

specic grounding recommendations. Do not mistake the

work lead for a ground cable.

ELECTRIC AND MAGNETIC FIELDS — May be dangerous. Electric

current owing through any conductor causes localized Electric

and Magnetic Fields (EMF). Welding and cutting current creates

EMF around welding cables and welding machines. Therefore:

1. Welders having pacemakers should

consult their physician before welding. EMF

may interfere with some pacemakers.

2. Exposure to EMF may have other

health eects which are unknown.

3. Welders should use the following

procedures to minimize exposure to EMF:

A. Route the electrode and work cables together. Secure them

with tape when possible.

B. Never coil the torch or work cable around your body.

C. Do not place your body between the torch and work cables.

Route cables on the same side of your body.

D. Connect the work cable to the workpiece as close as

possible to the area being welded.

E. Keep welding power source and cables as far away from

your body as possible.

FUMES AND GASES -- Fumes and gases,

can cause discomfort or harm, particu-

larly in conned spaces. Do not breathe

fumes and gases. Shielding gases can

cause asphyxiation. Therefore:

1. Always provide adequate ventilation in the work area by

natural or mechanical means. Do not weld, cut, or gouge on

materials such as galvanized steel, stainless steel, copper,

zinc, lead, beryllium, or cadmium unless positive mechani-

cal ventilation is provided. Do not breathe fumes from these

materials.

2. Do not operate near degreasing and spraying operations.

The heat or arc rays can react with chlorinated hydrocarbon

vapors to form phosgene, a highly toxic gas, and other irritant

gases.

3. If you develop momentary eye, nose, or throat irritation

while operating, this is an indication that ventilation is not

adequate. Stop work and take necessary steps to improve

ventilation in the work area. Do not continue to operate if

physical discomfort persists.

4. Refer to ANSI/ASC Standard Z49.1 (see listing below) for

specic ventilation recommendations.

5. WARNING: This product, when used for welding or cut-

ting, 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

§25249.5 et seq.)

CYLINDER HANDLING -- Cylinders, if mis-

handled, can rupture and violently release

gas. Sudden rupture of cylinder, valve, or

relief device can injure or kill. Therefore:

1. Use the proper gas for the process

and use the proper pressure reducing regula-

tor designed to operate from the compressed

gas cylinder. Do not use adaptors. Maintain hoses and ttings

in good condition. Follow manufacturer's operating instruc-

tions for mounting regulator to a compressed gas cylinder.

2. Always secure cylinders in an upright position by chain or

strap to suitable hand trucks, undercarriages, benches, walls,

post, or racks. Never secure cylinders to work tables or xtures

where they may become part of an electrical circuit.

3. When not in use, keep cylinder valves closed. Have valve pro-

tection cap in place if regulator is not connected. Secure and

move cylinders by using suitable hand trucks. Avoid rough

handling of cylinders.

4. Locate cylinders away from heat, sparks, and ames. Never

strike an arc on a cylinder.

5. For additional information, refer to CGA Standard P-1, "Precau-

tions for Safe Handling of Compressed Gases in Cylinders",

which is available from Compressed Gas Association, 1235

Jeerson Davis Highway, Arlington, VA 22202.

EQUIPMENT MAINTENANCE -- Faulty or im-

properly maintained equipment can cause

injury or death. Therefore:

1. Always have qualied personnel perform

the installation, troubleshooting, and maintenance work. Do

not perform any electrical work unless you are qualied to

perform such work.

2. Before performing any maintenance work inside a power

source, disconnect the power source from the incoming

electrical power.

3. Maintain cables, grounding wire, connections, power cord,

and power supply in safe working order. Do not operate any

equipment in faulty condition.

4. Do not abuse any equipment or accessories. Keep equipment

away from heat sources such as furnaces, wet conditions such

as water puddles, oil or grease, corrosive atmospheres and

inclement weather.

5. Keep all safety devices and cabinet covers in position and in

good repair.

6. Use equipment only for its intended purpose. Do not modify

it in any manner.

ADDITIONAL SAFETY INFORMATION -- For more

information on safe practices for electric arc weld-

ing and cutting equipment, ask your supplier for

a copy of "Precautions and Safe Practices for Arc

Welding, Cutting and Gouging", Form 52-529.

The following publications, which are available from

the American Welding Society, 550 N.W. LeJuene Road, Miami,

FL 33126, are recommended to you:

1. ANSI/ASC Z49.1 - "Safety in Welding and Cutting"

2. AWS C5.1 - "Recommended Practices for Plasma Arc Welding"

3. AWS C5.2 - "Recommended Practices for Plasma Arc Cutting"

4. AWS C5.3 - "Recommended Practices for Air Carbon Arc Goug-

ing and Cutting"

5. AWS C5.5 - "Recommended Practices for Gas Tungsten Arc

Welding“

6. AWS C5.6 - "Recommended Practices for Gas Metal Arc Weld-

ing"“

7. AWS SP - "Safe Practices" - Reprint, Welding Handbook.

8. ANSI/AWS F4.1, "Recommended Safe Practices for Welding and

Cutting of Containers That Have Held Hazardous Substances."

MEANING OF SYMBOLS - As used throughout

this manual: Means Attention! Be Alert! Your

safety is involved.

Means immediate hazards which, if not

avoided, will result in immediate, serious

personal injury or loss of life.

Means potential hazards which could

result in personal injury or loss of life.

Means hazards which could result in minor

personal injury.

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g. Empêchez l’apparition de toute humidité, notamment sur

vos vêtements, à la surface de l’emplacement de travail,

des câbles, du porte-électrode et du poste de soudage/

coupage. Réparez immédiatement toute fuite d’eau.

4. VENTILATION-- La respiration prolongée des fumées

résultant des opérations de soudage/coupage, à l’inté-

rieur, d’un local clos, peut provoquer des malaises et

des dommages corporels. Aussi convient-il d’observer

les précautions suivantes:

a. Assurez en permanence une aération adéquate de

l’emplacement de travail en maintenant une ventilation

naturelle ou à l’aide de moyens mécaniques. N’effec-

tuez jamais de travaux de soudage ou de coupage

sur des matériaux de zinc, de plomb, de beryllium ou

de cadmium en l’absence de moyens mécaniques de

ventilation capables d’empêcher l’inhalation des fumées

dégagées par ces matériaux.

b. N’effectuez jamais de travaux de soudage ou de cou-

page à proximité de vapeurs d’hydrocarbure chloré

résultant d’opérations voisines de dégraissage ou de

pulvérisation. La chaleur dégagée ou le rayonnement

de l’arc peut déclencher la formation de phosgène --

gaz particulièrement toxique -- et d’autres gaz irritants,

à partir des vapeurs de solvant.

c. Une irritation momentanée des yeux, du nez ou de la

gorge constatée au cours de l’utilisation de l’équipe-

ment dénote un défaut de ventilation. Arrêtez-vous de

travailler an de prendre les mesures néces- saires

à l’amélioration de la ventilation. Ne poursuivez pas

l’opération entreprise si le malaise persiste.

d. Certaines commandes comportent des canalisations

où circule de l’hydrogène. L’armoire de commande est

munie d’un ventilateur destiné à empêcher la forma-

tion de poches d’hydrogène, lesquelles présentent un

danger d’explosion; ce ventilateur ne fonctionne que si

l’interrupteur correspondant du panneau avant se trouve

placé en position ON (Marche). Veillez à manœuvrer

cette commande en vériant si le couvercle est bien en

place, de façon à assurer l’efcacité de la ventilation

ainsi réalisée. Ne jamais débrancher le ventilateur.

e. Les fumées produites par l’opération de soudage ou

de coupage peuvent s’avérer toxiques. Aussi est-il

nécessaire de disposer en permanence d’un dispositif

adéquat de ventilation de type aspirant, an d’élimi-ner

du voisinage de l’opérateur tout dégagement de fumée

visible.

f. Consultez les recommandations particulières en matière

de ventilation indiquées à l’alinéa 6 de la norme Z49.1

de l’AWS.

5. ENTRETIEN DE L’ÉQUIPEMENT-- Un équipement

entretenu de façon défectueuse ou inadéquate risque

non seulement de réaliser un travail de mauvaise qualité

mais, chose plus grave encore, d’entraîner des dom-

mages corporels graves, voire mortels en déclenchant

des incendies ou des chocs électriques. Observez par

conséquent les précautions suivantes:

a. Efforcez-vous de toujours coner à un personnel qua-li-

é l’installation, le dépannage et l’entretien du poste de

soudage et de coupage. N’effectuez aucune réparation

électrique sur l’équipement à moins d’être qua-lié à

cet effet.

b. Ne procédez jamais à une tâche d’entretien quelconque

à l’intérieur du poste de soudage/coupage, avant d’avoir

débranché l’alimentation électrique.

c. Maintenez en bon état de fonctionnement les câbles, le

câble de masse, les branchements, le cordon d’alimen-

tation et le poste de soudage/coupage. N’utilisez jamais

le poste ou l’équipement s’il présente une défectuosité

quelconque.

d. Prenez soin du poste de soudage et de coupage et

des équipements accessoires. Gardez-les à l’écart des

sources de charleur, notamment des fours, de l’humidi-

té, des aques d’eau maintenez-les à l’abri des traces

d’huile ou de graisse, des atmosphères corrosives et

des intempéries.

e. Laissez en place tous les dispositifs de sécurité et tous

les panneaux de l’armoire de commande en veillant à

les garder en bon état.

f. Utilisez le poste de soudage/coupage conformément

à son usage prévu et n’effectuez aucune modication.

6. INFORMATIONS COMPLÉMENTAIRES RELATIVES

À LA SÉCURITÉ--

Pour obtenir des informations complémentaires sur

les règles de sécurité à observer pour le montage et

l’utilisation d’équipements de soudage et de coupage

électriques et sur les méthodes de travail recomman-

dées, demandez un exemplaire du livret N° 52529 “Pre-

cautions and Safe Practices for Arc Welding, Cutting and

Gouging” publié par ESAB. Nous conseillons également

de consulter les publications sui-vantes, tenues à votre

disposition par l’American Welding Society, 550 N.W.

LeJuene Road, Miami, FL 32126:

a. “Safety in Welding and Cutting” AWS Z49.1

b. “Recommended Safe Practices for Gas-Shielded Arc

Welding “AWS A6. 1.

c. “Safe Practices for Welding and Cutting Containers That

Have Held Combustibles” AWS-A6.0.

d. “Recommended Safe Practices for Plasma Arc Cutting”

AWS-A6. 3.

e. “Recommended Safe Practices for Plasma Arc Welding”

AWS-C5. 1.

f. “Recommended Safe Practices for Air Carbon Arc Gou-

ging and Cutting” AWS-C5. 3.

g. “Code For Safety in Welding and Cutting” CSA-Standard

W117. 2.

Table 2 - ST-21M Wire Feed Accessories

Contact Tip Torch

Wire Wire Contact (Threaded) Torch Inlet

Type Size Tube Long Short Liner Guide

HARD .030 — — 632791 690515 (.070) 690516

.035 996104 632794 632793 690515 (.070) 690516

.045 996105 632796 632795 690514 (.100) 690516

.052 996816 948335 948308 690514 (.100) 690516

1/16 996106 632798 632797 690514 (.100) 690516

3/32 996108 — 632800 993844 (.140) 690516

CORED (a) .045 996105 — 632795 690514 (.100) 690516

.052 996816 — 948308 690514 (.100) 690516

1/16 996106 — 632797 690514 (.100) 690516

3/32 996108 — 632800 993844 (.140) 690516

7/64 (c) — — 633611 — 11N73

SOFT .030 — — 632791 6271087 (.070) (b) 690516

.035 996104 632794 632793 6271087 (.070) (b) 690516

3/64 996105 632796 632795 993843 (.110) 690516

1/16 996106 632798 632797 993843 (.110) 690516

3/32 996108 — 633611 993901 (.138) 690516

(a) Use No. 12M nozzle (P/N 997310) for cored wire.

(b) Also requires a support tube liner, (P/N 993901).

5. Power Cable. Customer supplied 4/0 power cable

with connector lug (P/N 81F60).

6. Coolant Circulator - A unit capable of circulating

coolant at the rate of 1 gpm at 50 psi is more than

adequate for protecting the torch. The Coolant circula-

tor should be capable of providing at least 6400 BTU/

hr cooling capacity at 40°C ambient temperature.

The use of p/n 0560950312 TORCH Coolant 50%

EG 1GAL is recommended in the coolant circulator.

NOTE: The circulator cannot be set up for solenoid

valve shutoff.

Table 1 - ST-21M Nozzles

No. 8 .......................................................................598739*

No. 10 .....................................................................598721*

No. 10L (Long Length) ...........................................598891*

No. 12 ...................................................................... 633985

No. 12L (Long Length) ............................................ 639756

No. 12M (Med. Length) ........................................... 997310

No. 12 Spot ............................................................. 993757

* Requires Spatter Liner 633603.

B. OPTIONAL ACCESSORIES

1. Remote Mounting Accessories. If remote mount-

ing of torch is desired, conduit, conduit liner (if using

aluminum wire), torch-to-conduit adaptor (61N59 and

welding head wire outlet guide are required. Refer to

Fig. 2 and Tables 3 and 4 for the proper accessories.)

2. Cold Wire Accessories. After-market cold wire feed

systems and accessories can be used with the ST-

21M. The torch body is 1-3/8" dia., a typical size for

automatic torches, holders, and accessories.

3. Centering Bushing, Part No. 994330 (for use with 8

and 10 nozzles). Eliminates any possibility of spatter

bridging in the torch. This is accomplished by using

this one-piece centering bushing/spatter liner in place

of the two individual pieces normally used. Note that it

can only be used at maximum currents of 350 amps

with Argon or 550 amps with CO

2. Insert a torch liner (and support liner, if used) through

the mounting bracket on the rear of torch until it is

rmly seated within the torch.

3. Slip a torch inlet guide tip, of the proper size, over the

protruding end of the liner and screw it into the end

of the mounting bracket.

4. With the insulator sleeve (14N14) in place over the

mounting bracket (step 1-d), insert the bracket into

the clamp on the accessory support assembly of the

welding head. Secure the bracket by tightening the

locking handle on support assembly clamp. Connect

the service lines to plumbing box, connection block,

or directly to supply sources using service line exten-

sions and couplings where necessary.

Table 4 - Wire Feed Accessories for Remote Mounting

NOTE: See Tables 1 and 2 for nozzle and contact tube/tip requirements.

Wire Conduit* Wire Outlet Guide Outlet

Wire Size Torch Conduit Guide

type in. Liner 4-ft. 6-ft. 10-ft. Liner** EH-10A Insert

HARD .045 690514 38V86 39V99 40V18 None 39N15† None

.052 690514 38V86 39V99 40V18 None 39N15† None

1/16 690514 38V86 39V99 40V18 None 39N15† None

5/64 993844 38V89 40V01 — None 62N17†† None

3/32 993844 38V80 39V83 40V20 None 62N17†† None

CORED .045 690514 38V86 39V99 40V18 None 39N15† None

.052 690514 38V86 39V99 40V18 None 39N15† None

1/16 690514 38V86 39V99 40V18 None 39N15† None

5/64 993844 38V89 40V01 — None 62N17†† None

3/32 993844 39V80 39V83 40V20 None 62N17†† None

7/64 — 39V80 39V83 40V20 None 39N16 None

SOFT 3/64 993901 38V89 40V01 — 42V74 29N13 05N57

1/16 — 39V80 39V83 40V20 42V75 29N13 12N75

3/32 — 39V80 39V83 40N20 42V73 29N13 05N58

* Requires adaptor, P/N 61N59, in place of torch inlet guide tip (on torch mounting bracket).

** Conduit liners must be cut to the proper length to allow 1/16-in. clearance between liner and contact tube.

† Includes replaceable sleeve (995692).

†† Includes replaceable sleeve (995693)

III. INSTALLATION

Depending on the choice of mounting system used,

either direct or remote, install the wire feed components

as outlined below and illustrated in Figures 1 and 2.

A. DIRECT MOUNTING TO EH-10A WELDING HEAD

(Refer to Figs. 1 and 3)

1. Install the torch mounting bracket (accessory part No.

633885) on the ST-21M as follows:

a. Loosen (and if necessary, remove) the setscrew

located in the recessed hole at the rear of the torch

barrel.

b. Place the small spacer tube (633887, supplied)

into the conduit connection tting at the rear of the

torch barrel, and tighten the setscrew to secure the

tube.

c. Slip the mounting bracket, large end rst, over

the rear torch barrel and the attached spacer and

then, using the 1/4-in. capscrew supplied, tighten

the bracket around the torch barrel.

d. Place the insulator sleeve (14N14, supplied) over

the end of the mounting bracket.

*ADAPTOR (PART OF

CONN. BLK. ASSY).

TORCH MOUNTING

BRACKET - 633885

ST-21M MIG MACHINE

TORCH - 690509

ADJUSTABLE SLIDE

25V39

MOUNTING PLATE

493195

TORCH MOUNTING

BRACKET - 633885

ST-21M MIG MACHINE

TORCH - 690509

Fig. 1 - ST-21M Torch Direct Mounting Fig. 2 - ST-21M Torch Remote Mounting

5. With the nozzle and contact tube removed and wire

in the feed rolls, use the inching switch on the control

to feed wire through the mounting bracket and torch

until it protrudes from the end of the torch.

6. Select the correct contact tube or tip. If using contact

tube, slip the tube and collet nut (632811) over the

wire, and screw the nut into the torch to hold the tube

in place.

7. Place a spatter liner (633603, if one is required) in

the proper size nozzle and install into the front end

of the torch.

B. REMOTE MOUNTING

Follow the steps as described above in section III-A.

except in step 3, install adaptor (61N59) in place of torch

inlet guide tip. The torch is then mounted to mounting

bracket (see Fig. 2) and conduit (with conduit liner

installed if required) is to be connected to torch and to

wire outlet guide on welding head.

IV. ADJUSTMENT AND OPERATION

Before adjustments are made, disengage the pressure

roll to prevent wire from feeding and arcing to an acci-

dental ground. To set the shielding gas ow rate, press

the weld start button to open the gas solenoid valve and

adjust the owmeter to the desired ow rate.

Make sure the coolant system is completely lled, and

be sure to plug in the coolant recirculator before operat-

ing the torch.

Specic operation of the torch depends on the particular

wire feeder with which it is to be used. Therefore, consult

the instruction booklet supplied with the wire feeder.

When changing wires — switch to one of different size

and composition — make sure you refer to the wire Feed

Accessories Table. The listed parts are to be used for a

particular wire size — DO NOT SUBSTITUTE PARTS.

* If desired, the adaptor and the lug can be switched to the opposite sides

of the connection block.

CONNECTION BLOCK

ASSY - 58V74

WELDING

HEAD

TORCH INLET

GUIDE TIP

(SEE TABLE 2)

MOUNTING

BRACKET -

996497

CONDUIT (See Table 4)

ADAPTOR - 61N59

CONDUIT LINER

(SEE TABLE 4)

TO WELDING HEAD

(See Table 4)

V. MAINTENANCE & REPLACEMENT PARTS

A. POWER CABLE

If the power cable assembly becomes damaged, it is rec-

ommended that (1) a new one be purchased, or (2) the

damaged unit be turned over to ESAB authorized repair

station for repair. The connection ttings are crimped on

at the factory by special crimping tools to ensure strong

connections and prevent leakage. A satisfactory job

cannot be done without these tools.

B. GAS AND COOLANT HOSE ASSEMBLIES

(Refer to Fig. 3)

If shielding gas or coolant hose assemblies require

replacement, loosen the two No. 10—32 x 3/16-in. set

screws on the locking nut and pull back barrel.

To replace a gas hose assembly, proceed as follows:

1. Clip off wire hose clamp (53N46) and remove hose.

2. Clean off the tting, and then brush on some 3M type

1711 adhesive onto the tting.

3. Slide new wire hose clamp on the new hose and insert

the hose over the grooved sealing area of the hose

tting on the torch.

4. Using a pair of pliers, pull on the hose clamp tightly

over the grooved sealing surface and apply 1/2 twist.

Be sure to position the wire hose clamp so that the

twist does not interfere with another part or the inside

of the handle.

5. Reposition the pliers about 1/8-in. from the hose and

twist an additional 1-1/2 turns.

6. Snip off excess wire about 1/8-in. from hose and bend

the twisted ends as shown below.

To replace the coolant hose assembly, proceed as fol-

lows:

1. Snip off the ear of the hose clamp by cutting into the

sides with pliers. Then remove hose.

2. Clean off the tting, and then brush on some 3M type

1711 adhesive onto the tting.

3. Slide hose clamp (950626 - supplied with hose as-

sembly) over the new hose assembly.

4. Push the new hose onto the short coolant connection

tube of the torch body and tube assembly. Position

the hose clamp over the grooved section of the short

tube.

5. Crimp the ear of the hose clamp with pincers as il-

lustrated below.

6. Rotate the hose clamp so that the ear is positioned

close to the power connection tube as shown in sec-

tion “A-A” of Figure 3.

ST-21M MACHINE

TYPE MIG TORCH

690509

SETSCREW - #10-32 X 3/16" (61330907)

(Supplied with 997032) (Align hole in barrel over setscrew.)

CLAMP - 950626

LOCKING NUT - 598787

INSULATING SLEEVE - 633880

NOZZLE (ACCESSORY)

(SEE TABLE 1)

CENTERING BUSHING - 17782

NOZZLE BODY - 633881

WIRE GUIDE, BODY & TUBE ASS'Y - 997032

INCLUDES:

WIRE GUIDE INSULATOR - 997031

CLAMP - 53N46

TORCH MOUNTING BRACKET - 633885

INCLUDES

SPACER - 633887

INSULATOR SLEEVE - 14N14

ACCESSORY

COOLANT HOSE

ASSY. - 17980

(29-IN. LG.)

5/8"-18 L. H.

includes:

CLAMP - 950626

POWER CABLE

ASS'Y. - 46V12

(24-IN. LG.)

7/8"-14 L. H.

GAS HOSE

ASS'Y. - 17981

(26 - 1/2-IN. LG.)

CONDUIT

POWER/COOLANT OUT

GAS

COOLANT HOSE CLAMP

(position as shown)

Sect. A-A

EH-10 WELDING HEAD

INSULATOR SLEEVE

14N14 (SUPPLIED WITH

633885)

MOUNTING BRACKET

633885

CONNECTION BLOCK

ASS'Y. - 58V74

(SHOWN ATTACHED

TO EH-10 HEAD)

SPACER - 633887

(SUPPLIED WITH

633885)

MOUNTING ARRANGEMENT OF

ST-21 M MACHINE TORCH TO

EH-10 WELDING HEAD

5/8" — 18

CAPSCREW - 1/4"-20 X 5/8"

(Supplied with 633885)

1 3/8"

DIA.

(2) SETSCREW - 10-32 X 3/16" (61330907)

GASKET - 633884

END

FITTING-

996403

(Supplied with 997032)

1/8" NPT

SPATTER LINER

(SEE TABLE 1)

COLLET NUT 632811

CONTACT TUBE (ACCESSORY)

(SEE TABLE 2)

TORCH INLET

GUIDE TIP &

TORCH LINER

(ACCESSORY)

(SEE TABLE 2)

996300

SUPPLIED

CENTERING BUSHING

REMOVAL TOOL

BARREL - 690524

TORCH GAS

TORCH POWER

(& Coolant Out)

TORCH COOLANT IN

PLUMBING

BOX

996067

GAS HOSE*

COOLANT HOSE*

TO GAS

WC-9 or WC-8C

COOLANT

CIRCULATOR

OPTIONAL COOLANT HOSE ADAPTOR - 11N16

(Connects Hose to 1/4-in. NPT)

POWER

SOURCE

4/0 POWER CABLE

(Customer Supplied)

TORCH GAS

TORCH POWER

(& Coolant Out)

TORCH COOLANT IN

GAS HOSE*

COOLANT HOSE*

TO GAS

POWER

SOURCE

(Customer Supplied)

4/0 POWER CABLE

COOLANT HOSE*

OPTIONAL ADAPTOR - 11N16

CONN.

BL’K

ASSY.

58V74

WELDING

HEAD

CONNECTOR - 2062310

(Supplied with Plumbing Box)

ELBOW - 999849

(Supplied with Conn. Box)

(& Coolant Out)

WC-9 or WC-8C

COOLANT

CIRCULATOR

TORCH COOLANT

COOLANT HOSE*

TO GAS

GAS HOSE*

TORCH GAS

TORCH POWER

COOLANT HOSE*

11N18

11N17

45V11

OPTIONAL ADAPTOR - 11N16

COUPLINGS

POWER

SOURCE

4/0 POWER CABLE

(Customer Supplied)

NOTE:

ALL SERVICE LINES MAY BE

EXTENDED, USING COUPLINGS:

11N17 (GAS)

11N18 (COOLANT)

11N19 (POWER/COOLANT OUT)

*AVAILABLE SERVICE LINES

COOLANT HOSE, 3-FT. ....................................20634

COOLANT HOSE, 12-1/2-FT. ............................40V76

COOLANT HOSE, 25-FT. ..................................406196

GAS HOSE, 3 -FT.............................................. 31504

GAS HOSE, 12-1/2-FT. ..................................... 40V77

GAS HOSE, 25-FT............................................. 34V38

POWER CABLE, 12-1/2-FT. .............................. 40V78

Fig. 4 - ST-21M Service Line Connection Diagram

CAUTION: Do not clean the liner while it is assembled

in the conduit. The solvent will attack and

destroy the conduit’s rubber covering.

C. CONDUIT LINER (For remote mounting installa-

tions only.)

The plastic lined conduit liners (42V73, 42V74, and

42V75) used to feed aluminum should be cleaned

periodically to remove any accumulation of dust or dirt.

A solvent, such as oxylene (trichlorotriuoroethane,

CCL

) should be forced through the conduit and

then blown out with air. Flushing the solvent through

the conduit 5 or 6 times will be sufcient. The solvent

can be purchased from the J.B. Moore Corp., Nutley,

New Jersey.

WC-9 or WC-8C

COOLANT

CIRCULATOR

D. NOZZLES

Nozzle spatter will be minimal and will wipe off easily

due to efcient nozzle cooling. If necessary, occasional

tightly adhering spatter can be removed from the inside

of nozzles with a hand reamer or le. Exercise care not

to damage the spatter liner or that spatter does not drop

back into the nozzle or contact tube. Ideally, the nozzle

should be removed for cleaning. Adherence of spatter

can be removed for cleaning. Adherence of spatter can

be further minimized and removal made easier by thinly

coating the inside of the nozzle with No. 65 Nozzle Com-

pound (4 oz. can - 08N65; 1 qt. can - 08N75). If spatter

liner is damaged or cracked it should be replaced.

E. CENTERING BUSHING

(Refer to Fig. 3.)

To remove the centering bushing (17782) for replace-

ment or inspection purposes, proceed as follows:

1. Turn off power supply.

2. Unscrew nozzle (and collet nut, if necessary) and

remove contact tube.

3. Insert centering bushing removal tool 996300, (sup-

plied with torch assembly) through two adjacent bush-

ing slots and then hook over two opposite bushing

ribs. The centering bushing can then be removed by

pulling the tool straight out.

F. GASKET, INSULATOR AND END FITTING

(Refer to Fig. 3.)

To remove gasket (633884), insulator (997031) or wire

guide end tting (996403) for replacement or inspection

purposes, proceed as follows:

1. With power supply turned off, disconnect all torch

service lines.

2. Remove nozzle, contact tube, and collet nut or contact

tip.

3. Loosen the two setscrews on locking nut (598787)

and pull back torch barrel (mounting bracket attached)

enough to allow the locking nut to rotate freely.

4. Unscrew the locking nut from the nozzle body

(633881).

5. Pull nozzle body away from the wire guide assembly

(997032). The centering bushing (17782) will fall free.

6. Check the gasket for cracks and deformed sealing

surfaces. When replacing the old or installing a new

gasket, apply a thin lm of Dow Corning DC 111

silicone grease (73585007) or equivalent to the O.D.

and sealing surfaces of the gasket.

To reassemble the gasket for proper seating over the

pliable silicone rubber insulator (997031), pull the

insulator out partially and then slide the gasket over

the insulator until the side of the gasket, that will seat

against the torch body, and the end of the insulator

are ush. Push the gasket and insulator together until

the gasket is properly seated against the torch body.

7. To remove the wire guide end/tting (996403), clamp

the torch body in a vise or use a vise-grip type pliers

on the wire guide and then unscrew the end tting

using a 7/16-in. open-end wrench. Before installing

a new tting, apply a thin lm of Dow Corning Heat

Sink Compound No. 340 (73585976) to both the male

and female threads.

Note: much smaller amounts are available commercially.

8. Reassemble the torch in reverse order.

IF YOU DO NOT KNOW WHOM TO CALL

Telephone: (800) ESAB-123/ Fax: (843) 664-4452/ Web:http://www.esab.com

Hours: 7:30 AM to 5:00 PM EST

A. CUSTOMER SERVICE QUESTIONS:

Order Entry Product Availability Pricing Delivery

Order Changes Saleable Goods Returns Shipping Information

Eastern Distribution Center

Telephone: (800)362-7080 / Fax: (800) 634-7548

Central Distribution Center

Telephone: (800)783-5360 / Fax: (800) 783-5362

Western Distribution Center

Telephone: (800) 235-4012/ Fax: (888) 586-4670

B. ENGINEERING SERVICE: Telephone: (843) 664-4416 / Fax : (800) 446-5693

Welding Equipment Troubleshooting Hours: 7:30 AM to 5:00 PM EST

Warranty Returns Authorized Repair Stations

C. TECHNICAL SERVICE: Telephone: (800) ESAB-123/ Fax: (843) 664-4452

Part Numbers Technical Applications Hours: 8:00 AM to 5:00 PM EST

Performance Features Technical Specications Equipment Recommendations

D. LITERATURE REQUESTS: Telephone: (843) 664-5562 / Fax: (843) 664-5548

Hours: 7:30 AM to 4:00 PM EST

E. WELDING EQUIPMENT REPAIRS: Telephone: (843) 664-4487 / Fax: (843) 664-5557

Repair Estimates Repair Status Hours: 7:30 AM to 3:30 PM EST

F. WELDING EQUIPMENT TRAINING:

Telephone: (843)664-4428 / Fax: (843) 679-5864

Training School Information and Registrations Hours: 7:30 AM to 4:00 PM EST

G. WELDING PROCESS ASSISTANCE:

Telephone: (800) ESAB-123 / Fax: (843) 664-4454 Hours: 7:30 AM to 4:00 PM EST

H. TECHNICAL ASST. CONSUMABLES:

Telephone : (800) 933-7070 Hours: 7:30 AM to 5:00 PM EST

ESAB Welding & Cutting Products, Florence, SC Welding Equipment

COMMUNICATION GUIDE  CUSTOMER SERVICES

ESAB ST-21M Mig Welding Torch Troubleshooting instruction

Brand: ESAB

Model: ST-21M Mig Welding Torch

Type: Troubleshooting instruction

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