Miller Electric MT-24-12-1 Manual de usuario

I,

Millerﬁ

November

1990

FORM:

OM-1558A

Effective

With

Style

No.

KB-8

MODEL:

MT-24-12-1

MT-24-25-1

MT-24F-1

2-1

MT-24

F-25-1

MT-24VF-12-1

MT-24VF-25-1

OWNERS

MANUAL

IMPORTANT:

Read

and

understand

the

entire

contents

both

this

manual

and

the

power

source

manual

used

with

this

unit,

with

special

emphasis

the

safety

material

throughout

both

manuals,

before

installing,

operating,

maintaining

this

equipment.

This

unit

and

these

instructions

are

for

use

only

persons

trained

and

experienced

the

safe

operation

welding

equip

ment.

not

allow

untrained

persons

install,

operate,

maintarn

this

unit.

Contact

your

distributor

you

not

fully

understand

these

instructions.

MILLER

ELECTRIC

Mfg.

Co.

Miller

Group

Ltd.,

Company

P.O.

Box

1079

Appleton,

54912

USA

Tel.

414-734-9821

..,,n~

SA-120

672

PRINTED

U.S.A.

LIMITED

WARRANTY

EFFECTIVE:

AUGUST

1990

lii

This

warranty

supersedes

all

MILLER

warranties

and

exclusive

with

dther

guarantees

warranties

expressed

implied.

LIMITED

WARRANTY



Subject

the

terms

and

conditions

hereof,

MILLER

Electric

Mfg.

Co.,

Appleton,

Wisconsin

war

rants

its

Distributor/Dealer

that

all

new

and

unused

Equipment

furnished

MILLER

free

from

defect

workmanship

and

material

the

time

and

place

delivery

MILLER.

warranty

made

MILLER

with

respect

engines,

trade

accessories

other

items

manufactured

others,

Such

engines,

trade

accessories

and

other

items

are

sold

subject

the

warranties

their

respective

manufacturers,

any.

All

engines

are

warrant

ied

their

manufacturer

for

two

years

from

date

original

purchase,

except

Deutz

engines

which

have

one

year,

2000

hour

warranty.

Except

specified

below,

MILLERs

warranty

does

not

apply

components

having

normal

useful

life

less

than

one

(1)

year,

such

spot

welder

tips,

relay

and

contactor

points,

MILLERMATIC

parts

that

come

contact

with

the

welding

wire

including

nozzles

and

nozzle

insulators

where

failure

does

not

result

from

defect

workmanship

material.

MILLER

shall

required

honor

warranty

claims

war

ranted

Equipment

the

event

failure

resulting

from

defect

within

the

following

periods

from

the

date

delivery

Equipment

the

original

user;

Arc

welders,

power

sources,

robots,

and

year

components

Load

banks

year

Original

main

power

rectifiers

years

(labor



year

only)

All

welding

guns,

feeder/guns

and

torches

days

All

other

MILLERMATIC

Feeders

year

Replacement

repair

parts,

exclusive

labor

days

Batteries

months

provided

that

MILLER

notified

writing

within

thirty

(30)

days

the

date

such

failure.

matter

general

policy

only,

MILLER

may

honor

claims

submitted

the

original

user

within

the

foregoing

periods.

the

case

MILLERs

breach

warranty

any

other

duty

with

respect

the

quality

any

goods,

the

exclusive

remedies

therefore

shall

be.

MILLERs

option

(1)

repair

(2)

replace

ment

or,

where

authorized

writing

MILLER

appropriate

cases.

(3)

the

reasonable

cost

repair

replacement

authorized

MILLER

service

station

(4)

payment

credit

for

the

purchase

price

(less

reasonable

depreciation

based

upon

actual

use)

upon

return

the

goods

Customers

risk

and

expense.

MILLERs

option

repair

replacement

will

FOB..

Factory

Appleton.

Wisconsin.

F.O.B.

MILLER

authorized

service

facility,

therefore,

compensation

for

transportation

costs

any

kind

will

allowed.

Upon

receipt

notice

apparent

defect

failure,

MILLER

shall

instruct

the

claimant

the

warranty

claim

procedures

followed.

ANY

EXPRESS

WARRANTY

NOT

PROVIDED

HEREIN

AND

ANY

IMPLIED

WARRANTY,

GUARANTY

REPRE

SENTATION

PERFORMANCE,

AND

ANY

REMEDY

FOR

BREACH

CONTRACT

WHICH,

BUT

FOR

THIS

PROVISION,

MIGHT

ARISE

IMPLICATION,

OPERATION

LAW,

CUSTOM

TRADE

COURSE

DEALING,

INCLUDING

ANY

IMPLIED

WARRANTY

MERCHAN

TABILITY

FITNESS

FOR

PARTICULAR

PURPOSE,

WITH

RESPECT

ANY

AND

ALL

EQUIPMENT

FURNISHED

MILLER

EXCLUDED

AND

DISCLAIMED

MILLER.

EXCEPT

EXPRESSLY

PROVIDED

MILLER

WRITING,

MILLER

PRODUCTS

ARE

INTENDED

FOR

ULTIMATE

PURCHASE

COMMERCIAL/INDUSTRIAL

USERS

AND

FOR

OPERATION

PERSONS

TRAINED

AND

EXPERIENCED

THE

USE

AND

MAINTENANCE

WELDING

EQUIPMENT

AND

NOT

FOR

CONSUMERS

CONSUMER

USE.

MILLERS

WARRANTIES

NOT

EXTEND

TO,

AND

RESELLER

AUTHORIZED

EXTEND

MILLERS

WARRANTIES

TO,

ANY

CONSUMER.

I

OM-1558A

11/90

RECEIVING-HANDLING

Before

unpacking

equipment,

check

carton

for

any

dam-

Use

the

following

spaces

record

the

Model

Designa

age

that

may

have

occurred

during

shipment.

File

any

tion

and

Serial

Style

Number

your

unit.

The

infor

claims

for

loss

damage

with

the

delivering

carrier.

mation

located

the

data

card

the

nameplate.

Assistance

for

filing

settling

claims

may

obtained

from

the

distributor

and/or

the

equipment

manufactur-

Model

_________________________________________

ers

Transportation

Department.

Serial

Style

No.

____________________________

When

requesting

information

about

this

equipment,

ways

provide

the

Model

Description

and

Serial

Style

Date

Purchase

_______________________________

Number.

TABLE

CONTENTS

Section

No.

Page

No.

SECTION



SAFETY

RULES

1-1.

Prevent

Electric

Shock

1-2.

Provide

Protection

From

Fumes

And

Gases

1-3.

Protect

Eyes

And

Skin

From

Arc

Rays;

Protect

Ears

From

Noise

1-4.

Prevent

Fires

And

Burns

1-5.

Protect

Compressed

Gas

Cylinders

1-6.

Provide

Protection

For

Speial

Situations

1-7.

Provide

Proper

Equipment

Maintenance

-8.

Additional

Safety

Information

SECTION

2

SAFETY

PRECAUTIONS

AND

SIGNAL

WORDS

2-1.

General

Information

And

Safety

2-2.

Safety

Alert

Symbol

And

Signal

Words

SECTION

3

SPECIFICATIONS

3-1.

Duty

Cycle

3-2.

Description

SECTION

4

INSTALLATION

4-1.

Torch

Body

4-2.

Gas

Hose

Connections

And

Gas

Valve

(If

Applicable)

4-3.

Power

Cable Connection

SECTION

5

SEQUENCE

OPERATION

5-1.

Gas

Tungsten

Arc

Welding

(GTAW)

5-2.

Shutting

Down

SECTION

6

MAINTENANCE

6-1.

Routine

M~intenance

6-2.

Tungsten

Electrode

SECTION

7

PARTS

LIST

Figure

7-1.

Complete

Torch

Assembly

Figure

7-2.

Consumable

Parts

And

Cross

Reference

Chart

LIST

CHARTS

AND

TABLES

Table

3-1.

Specifications

Table

6-1.

Maintenance

Schedule

Table

6-2.

Tungsten

Size

SECTION



SAFETY

RULES

WARNING:

UNSAFE

PROCEDURES

1-3.

PROTECT

EYES

AND

SKIN

FROM

ARC

PRACTICES

can

cause

serIous

personal

in-

RAYS;

PROTECT

EARS

FROM

NOISE

jury

death.

Arc

rays

from

the

welding

process

produce

intense

heat



Read,

understand,

and

ALL

these

and

strong

ultraviolet

rays

that

can

burn

eyes

and

skin.

safety

rules

before

installing,

operating,

servicing

this

equipment.

Noise

from

some

processes

can

damage

hearing.



sure

that

all

end

users

this

equipment,

Wear

welding

helmet

fitted

with

proper

filter

the

operator

and

helpers,

read

and

under-

lens

(see

ANSI

Z49.1

for

detailed

information).

stand

these

safety

rules.

Wear

welding

helmet

fitted

with

proper

filter

lens

(see

ANSI

Z49.1

for

detailed

information).

Use

protective

screens

barriers

protect

0th-

1-1.

PREVENT

ELECTRIC

SHOCK

ers

from

flash

and

glare.

Touching

live

electrical

parts

can

cause

severe

burns

Wear

protective

clothing

and

foot

protection.

the

body

fatal

shock.

Severity

electrical

shock

1-4.

PREVENT

FIRES

AND

BURNS

term

med

the

path

and

amount

current

through

the

body.

Therefore:

The

hotworkpiece,

hot

equipment,

other

hot

metal,

spat

ter,

and

arc

sparks

can

cause

fires

and

burns.

not

touch

live

electrical

parts.

Wear

correct

eye,

face,

and

body

protection

the

2..

not

work

wet

damp

areas.

work

area.

Wear

dry

insulating

gloves

and

body

protection.

Allow

work

and

equipment

cool

before

han

dling.

Disconnectallpowerbeforeinstallingorservicing

not

weld

near

flammable

material.

this

equipment.

Watch

for

fire,

and

keep

fire

extinguisher

Turn

off

all

equipment

when

not

use.

nearby.

Properly

install

and

ground

the

welding

power

For

additional

information,

refer

NFPA

Stan-

source

according

its

Owners

Manual

and

all

dard

Fire

Prevention

Use

Cutting

and

applicable

codes.

Welding

Processes,

available

from

the

National

Fire

Protection

Association,

Batterymarch

Park,

not

use

worn

damaged

cables

that

Quincy,

02269.

are

too

small

poorly

spliced.

1-5.

PROTECT

COMPRESSED

GAS

CYLINDERS

not

wrap

cables

around

your

body.

Since

gas

cylinder

are

normally

part

the

welding

proc

not

touch

electrode

and

any

grounded

object

ess,

sure

treat

them

carefully.

circuit

the

same

time.

Protect

compressed

gas

cylinders

from

exces

10.

Use

only

well-maintained

equipment.

Repair

sive

heat,

mechanical

shocks,

and

arcs.

replace

damaged

parts

once.

Install

and

secure

cylinder

that

they

cannot

fall

tip

over

fastening

them

mounting

1-2.

PROVIDE

PROTECTION

FROM

FUMES

AND

bracket,

wall,

other

stationary

support.

GASES

Keep

cylinders

away

from

any

welding

other

electrical

circuits.

Breathing

welding

fumes

and

gases

can

hazardous

your

health.

Never

allow

welding

electrode

touch

any

cyl

inder.

Keep

your

head

out

the

fumes.

1-6.

PROVIDE

PROTECTION

FOR

SPECIAL

SITU-

Use

adequate

ventilation

the

work

areato

keep

ATIONS

fumes

and

gases

from

your

breathing

zone

and

the

general

work

area.

not

weld

cut

containers

materials

which

have

held

been

contact

with

hazardous

sub

ventilation

inadequate,

use

approved

stances

unless

they

are

properly

cleaned

and

breathing

device.

spected.

Read

the

Material

Safety

Data

Sheets

(MSDSs)

not

weld

cut

painted

plated

parts

unless

and

the

manufacturers

instructions

for

any

mate-

special

ventilation

provided

remove

highly

rials

used.

toxic

fumes

gases.

OM-1558

Page

Since

welding

can

affect

pacemakers,

keep

all

pacemaker

wearers

out

the

work

area.

Have

them

consult

doctor

before

coming

near

weld

ing

operation.

1-7.

PROVIDE

PROPER

EQUIPMENT

MAINTE

NANCE

improperly

maintained

equipment

can

result

poor

work,

but

most

importantly

can

cause

physical

injury

death

through

fires

electrical

shock.

Therefore:

Always

have

qualified

personnel

perform

the

stallation,

troubleshooting,

and

maintenance

work.

not

perform

any

electrical

work

unless

you

are

fully

qualified.

Before

performing

any

maintenance

work

inside

power

supply,

disconnect

the

power

supply

from

the

electrical

power

source.

Maintain

cables,

grounding

wire,

connections,

power

cord,

and

power

supply

safe

working

order.

not

operate

any

equipment

question

able

condition.

not

abuse

any

equipment

accessories.

Keep

equipment

away

from

heat

sources

such

furnaces,

wet

conditions

such

water

puddles,

oil

grease,

corrosive

atmospheres,

and

inclem

ent

weather.

Keep

all

safety

devices,

guards,

panels,

and

cov

ers

position

and

good

repair.

Use

equipment

for

its

intended

purpose.

not

modify

any

manner.

1-8.

ADDITIONAL

SAFETY

INFORMATION

For

information

safe

practices

for

setting

and

operating

electric

welding

and

cutting

equipment

and

good

working

habits,

ask

your

welding

equipment

sup

plier.

For

your

protection,

read

and

comply

with

the

latest

editions

the

following

standards:

ANSI

Standard

Z49.t

available

from

the

Ameri

can

Welding

Society,

550

N.W.

LeJeune

Rd,

ami,

33126.

AWS

Standard

A6.1,

Recommended

Safe

Prac

tices

for

Gas

Shielded

Arc

Welding,

available

from

the

American

Welding

Society,

550

N.W.

LeJeune

Rd,

Miami,

33126.

AWS

Standard

F4.1,

Recommended

Safe

Prac

tices

for

the

Preparation

for

Welding

and

Cutting

Containers

and

Piping

That

Have

Held

Hazard

ous

Substances,

available

from

the

American

Welding

Society,

550

N.W.

LeJeune

Rd,

Miami,

33126.

NFPA

Standard

51B,

Fire

Prevention

Use

Cutting

and

Welding

Processes,

available

from

the

National

Fire

Protection

Association,

Bat

terymarch

Park,

Quincy,

02269.

NFPA

Standard

70,

National

Electrical

Code,

available

from

the

National

Fire

Protection

Asso

ciation,

Batterymarch

Park,

Quincy,

02269.

ANSI

Standard

Z87.

Safe

Practice

for

Occupa

tion

and

Educational

Eye

and

Face

Protection,

available

from

the

American

National

Standards

Institute,

1430

Broadway,

New

York,

10018.

OSHA

Standard

CFR,

Part

1910,

Subpart

Welding,

Cutting,

and

Brazing,

available

from

the

Superintendent

Documents,

U.S.

Govern

ment

Printing

Office,

Washington,

20402.

CSA

Standard

17.2,

Code

for

Safety

Weld

ing

and

Cutting,

available

from

the

Canadian

Standards

Association,

178

Rexdale

Blvd.,

Rex

dale,

Ontario,

Canada

M9W

R3.

See

also

the

Standards

Booklet

Index

the

weld

ing

power

source

Owners

Manual.

OM-1558

Page

SECTION

2

SAFETY

PRECAUTIONS

AND

SIGNAL

WORDS

2-1.

GENERAL

INFORMATION

AND

SAFETY

General

Information

presented

this

manual

and

various

bels,

tags,

and

plates

the

unit

pertains

equipment

design,

installation,

operation,

maintenance,

and

troubleshooting

which

should

read,

understood,

and

followed

for

the

safe

and

effective

use

this

equipment.

Safety

The

installation,

operation,

maintenance,

and

trouble

shooting

arc

welding

equipment

requires

practices

and

procedures

which

ensure

personal

safety

and

the

safety

others.

Therefore,

this

equipment

stalled,

operated,

and

maintained

only

qualified

per

Sons

accordance

with

this

manual

and

all

applicable

codes

such

as,

but

not

limited

to,

those

listed

the

end

Section



Safety

Rules.

2-2.

SAFETY

ALERT

SYMBOL

AND

SIGNAL

WORDS

The

following

safety

alert

symbol

and

signal

words

are

used

throughout

this

manual

call

attention

and

iden

tify

different

levels

hazard

and

special

instructions.

This

safety

alert

symbol

used

with

the

signal

words

WARNING

and

CAUTION

call

atten

tion

the

safety

statements.

WARNING

statements

identify

procedures

practices

which

must

followed

avoid

seri

ous

personal

injury

loss

life.

CAUTION

statements

identify

procedures

practices

which

must

followed

avoid

minor

personal

injury

damage

this

equipment.

IMPORTANT

statements

identify

special

instructions

necessary

for

the

most

efficient

operation

this

equip

ment.

SECTION

3

SPECIFICATIONS

Table

3-1.

Specifications

Model

Ampere

Rating

100%

Duty

Cycle

DCEN;

ACHF

Tun9sten

Size

Capacity

Cable

Length

Torch

Body

Cooling

Method

Wei

ght

Net

Ship

MT-24-12-1

MT-24-25-1

MT-24F-1

2-1

MT-24-VF-12-1

MT-24F-25-1

MT-24VF-25-1

Amperes

With

Argon*

.020

thru

3/32

in.

(0.5

thru

2.4

mm)

12.5

ft.

(3.8

(7.6

Length:

8.1

in.

(206.0

mm)

Handle

Diameter:

0.75

in.

(19.0

mm)

Weight:

2.0

oz.

(57.0

Air

lbs.

(0.9

kg)

2.5

lbs.

(1.1

kg)

4.5

lbs.

(2.0

kg)

5.0

lbs.

(2.3

kg)



12.5

ft.

(3.8

ft.

(7.6

Length:

8.0

in.

(203.0

mm)

Handle

Diameter:

0.75

in.

(19.0

mm)

Weight:

3.0

oz.

(85.0

lbs.

(0.9

kg)

lbs.

(1.1

kg)

4.5

lbs.

(2.0

kg)

5.0

lbs.

(2.3

kg)

*Rated

With

Gas

Lens

Collet

Body

3-1.

DUTY

CYCLE

The

duty

cycle

welding

torch

the

percentage

ten

minute

period

that

torch

can

operated

given

load.

This

torch

rated

100%

duty

cycle

using

argon

shielding

gas.

This

means

that

the

torch

can

beoperated

rated

load

conditions

continuously.

CAUTION:

EXCEEDING

THE

RATED

AMPERAGE

and

duty

cycle

can

result

damage

the

torch.



not

exceed

rated

amperage

and

duty

cycle

stated

Table

3-1.

3-2.

DESCRIPTION

This

air-cooled

torch

specifically

for

use

with

the

Gas

Tungsten

Arc

Welding

(GTAW)

process.

The

alphanu

meric

model

designation

refers

the

following:

Ampere

Rating:

Amperes.

12-

12.5

ft.

(3.8

Cable

ft.

(7.6

Cable

One-Piece,

High-Flex

Cable

Gas

Valve

Flex

Head

OM-1

558

Page

SECTION

4

INSTALLATION

*Cup

~Tungsten

Electrode

Heat

Shield

Torch

Body

(Neck

Portion)

*POwer

Cable

Adapter

Gas

Valve

(If

Applicable)

0-Ring

Handle

SA-120

671

Figure

4-1.

Torch

Components

4-1.

TORCH

BODY

(Figure

4-1)

WARNING:

ELECTRIC

SHOCK

can

kill.



not

touch

live

electrical

parts.



Shut

down

welding

power

source,

and

dis

connect

input

power

employing

lockout/tag

ging

procedures

before

installing

torch.

Lockoutltagging

procedures

consist

pad

locking

line

disconnect

switch

open

position,

removing

fuses

from

fuse

box,

shutting

off

and

red-tagging

circuit

breaker

other

discon

necting

device.

The

torch

body

shipped

requiring

consumables

and

accessories

indicated

Figure

4-1:

Cup,

collet

body,

collet,

power

cable

adapter

(with

flex

cable

only),

and

tungsten

electrode.

Assembly

Assemble

torch

follows:

Install

collet,

slotted

end

last,

into

collet

body.

Install

collet

body

and

collet

into

torch

body

making

sure

heat

shield

place.

Install

properly

prepared

tungsten

electrode

(see

Section

6-2)

into

collet

body,

and

position

elec

trode

tip

outside

cup

rim.

Tighten

collet

body.

Install

cup

onto

collet

body.

readjust

electrode

position,

remove

cup

and

loosen

collet

body.

IMPORTANT:

general

rule,

electrode

extension

should

equal

electrode

diameter;

but

exact

electrode

tension

may

vary

according

application.

Flexible

Head

Adjustment

CAUTION:

BENDING

RIGID

HEAD

TORCH

can

damage

torch.



not

bend

rigid

head

model

torches.

Warranty

void

rigid

head

torch

bent

any

manner.

Improper

bending

flexible

head

torch

can

damage

gas

hose.

Make

sureto

bend

onlywithin

the

middle

portion

torch

neck

(see

Figure

4-1).

Restrict

bending

angle

degrees.

*Collet

*ColIet

Body



High

Flex

Cable

Fitting

*Required

Consumables

and

Accessories

**Obtain

from

Welding

Equipment

Supplier

OM-1

558

Page

4-2.

GAS

HOSE

CONNECTIONS

AND

GAS

VALVE

(If

Applicable)

(Figures

4-1

Thru

4-3)

IMPORTANT:

lfpower

source

not

equipped

with

gas

valve,

torch

gas

valve

required

(see

Figure

4-2).

High

Flex

Cable

Assembly

The

high

flex

cable

assembly

contains

the

power

cable

within

the

gas

hose.

The

high

flex

cable

has

3/8-24

male

right-hand

fitting

(see

Figure

4-1).

Torch

install

high

flex

cable,

connect

high

flex

cable

fitting

power

cable

adapter.

torch

includes

gas

valve,

connect

suitable

length

gas

hose

(extra

hose

not

supplied)

from

power

cable

adapter

regulator/flowmeter

(see

Figure

4-2).

torch

without

gas

valve,

connect

suitable

length

gas

hose

(not

supplied)

from

power

cable

adapter

gas

valve

outlet.

Connect

extra

gas

hose

(not

supplied)

from

gas

valve

inlet

regulator/flowmeter

(see

Figure

4-3).

Torch

Work

Clamp

Figure

4-3.

GTAW

Torch

Connection

Diagram

For

Models

Without

Gas

Valve

Gas

Cylinder

Ref.

SA.120

909

Regulator!

Flowmeter

Work

Clamp

Power

Cable

Adapter

Figure

4-2.

GTAW

Torch

Connection

Diagram

For

Models

With

Gas

Valve

Rot.

SA.120

909

Power

Cable

Adapter

Gas

Valve

OM-1

558

Page

Torch

Gas

Valve

Operation

(If

Applicable)

The

gas

valve

allows

gas

flow

control

the

torch.

one-

half

turn

counterclockwise

opens

the

gas

valve,

and

one-half

turn

clockwise

closes

the

valve.

The

gas

valve

allows

control

gas

postflow

time,

the

length

time

gas

flows

after

the

arc

extinguished.

sufficient

gas

postflow

results

oxidized

(black)

elec

trode

surface.

oxidized

electrode

were

used,

the

black

surface

would

contaminate

the

weld

and

cause

poor

arc

direction.

IMPORTANT:

general

rule,

allow

seconds

gas

postflow

time

per

100

amperes

weld

current

fore

closing

valve.

4-3.

POWER

CABLE

CONNECTION

(Figures

4-1

Thru

4-3)

WARNING:

ELECTRIC

SHOCK

can

kill.



not

touch

live

electrical

parts.



Shut

down

welding

power

source,

and

dis

connect

put

power

employing

lockout/tag

ging

procedures

before

installing

torch.

Lockout/tagging

procedures

consist

pad

locking

line

disconnect

switch

open

position,

removing

fuses

from

fuse

box,

shutting

off

and

red-tagging

circuit

breaker

other

discon

necting

device.

The

power

cable

part

the

high

flex

cable

assembly.

For

connection

both

power

cable

and

gas

hose

power

cable

adapter,

see

Section

4-2A.

Connect

power

cable

adapter

weld

output

terminal

(see

Figures

4-2

and

4-3).

SECTION

5

SEQUENCE

OPERATION

WARNING:

ELECTRIC

SHOCK

can

kill.



not

touch

live

electrical

parts.



Keep

all

covers

and

handle

place

while

operating.

ARC

RAYS,

SPARKS,

AND

HOT

SURFACES

can

burn

eyes

and

skin;

NOISE

can

damage

hearing.



Wear

correct

eye,

ear,

and

body

protection.

FUMES

AND

GASES

can

seriously

harm

your

health.



Keep

your

head

out

of the

fumes.



Ventilate

keep

from

breathing

fumes

and

gases.



ventilation

inadequate,

use

approved

breathing

device.

HOT

METAL,

SPATTER,

AND

SLAG

can

cause

fire

and

burns.



Watch

for

fire.



Keep

fire

extinguisher

nearby,

and

know

how

use

it.



not

use

near

flammable

material.



Allow

work

and

equipment

cool

before

handling.

MAGNETIC

FIELDS

FROM

HIGH

CURRENTS

can

affect

pacemaker

operation.



Wearers

should

consult

their

doctor

before

going

near

arc

welding,

gouging,

spot

weld

ing

operations.

See

Section

Safety

Rules

for

additional

information.

5-1.

GAS

TUNGSTEN

ARC

WELDING

(GTAW)

Install

and

connect

torch

according

Section

Make

sure

collet

body,

cup,

and

all

gas

connec

tions

are

securely

tightened.

With

regulator/flowmeter

valve

closed,

open

gas

cylinder

valve.

Set

power

source

for

desired

welding

amperage.

Wear

dry

insulating

gloves

and

clothing,

and

wear

welding

helmet

with

proper

filter

lens

according

ANSI

Z49.1.

Energize

welding

power

source.

Set

gas

flow

desired

level

(requires

open

gas

valve).

IMPORTANT:

Purge

gas

hose

clear

hose

air,

mois

ture,

any

other

contaminants.

Allow

gas

flow

minutes

new

torch;

seconds

thereafter.

Begin

welding.

5-2.

SHUTTING

DOWN

Stopwelding.

IMPORTANT:

general

rule,

allow

seconds

gas

postflow

time

per

100

amperes

weld

current

fore

closing

valve.

Turn

off

welding

power

source.

Turn

off

the

shielding

gas

the

source.

WARNING:

HIGH

CONCENTRATION

SHIELDING

GAS

can

harm

health

kill.



Shut

off

gas

supply

when

not

use.

OM-1558

Page

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