WELDMATIC
600
MODEL NO. CP6
CAT.
7524/6
6/80
FROM SERIAL NO.
6035
THE INFORMATION CONTAINED IN THE FOLDER
IS
SET OUT TO ENABLE
YOU
TO PROPERLY MAINTAIN YOUR NEW EQUIPMENT AND ENSURE THAT
YOU OBTAIN MAXIMUP4 OPERATING EFFICIENCY.
PLEASE ENSURE THAT THIS FOLDER
IS
KEPT
IN
A SAFE PLACE FOR
READY REFERENCE WHEN REQUIREI?.
WHEN REQUESTING SPARE PARTS, QUOTE THE MODEIi NO. AND SERIAL
NO. OF THE MACHINE AND THE PART NO. OF THE ITEM REQUIRED.
FAILURE TO SUPPLY THIS INFORMATION WILL RESULT
IN
UNNECESSARY
DELAYS
IN
SUPPLYING THE CORRECT PARTS.
WELDING INDUSTRIES OF AUSTRALIA PTY. LTD.
Melbourne
429 4766
Newcastle
61 1668
Sydney
534 2144
Adelaide
352 3022
Brisbane
44 1391
Perth
361 7088
Launceston
31 7004
Darwin
81
6427
&
84 3076
OPERATING
AND
MAINTENANCE
INSTRUCTIONS
-
WELDMATIC
600 (CP6)
-
INTRODUCTION
GENERAL
This manual has been prepared especially
for
use
in
familiar-
izing personnel with the design, installation, operation,
maintenance, and troubleshooting
of
this equipment.
All
inform-
ation presented herein should
be
given careful consideration
to
assure optimum performance
of
this
equipment.
RECEIVING/HANDLING.
Prior
to installing this equipment, clean
all
packing
material
from. around the unit and carefully inspect for any damage that
may have occurred during shipment. Any
claims
for
loses
or
damage that m.ay have occurred in transit
must
be
filed by the
purchaser with Welding Industries
of
Australia Pty. Ltd.
or
authorised agent immediately
(refer
to
EQUIPMENT
WARRANTY
card
enclosed with Operating Instruction Manual).
When requesting irrbbrmation concerning this equipment,
it
is
essential
to
supply
correct
Model identification and machine
serial
number.
SAFETY.
Before
the equipment
is
put into operation, the
SAFETY
PRACTICES
section
at
the
back
of
this manual
MUST
BE
READ
COMPLETELY.
This
will
kelp
avoid
possible injury due
to
misuse or improper
welding applications.
"
CONTENTS
PAGE
NO.
General Description
l
Setting up for Operation
2-3
Welding Operation Instructions
4
Maintenance Instructions
5-6
Welding
Data
-
Table
"C"
7
-
Parts
List
CP6-02 Issue
4
8
-
Assembly Drawing CP6-02
Issue
2
9
Circuit Diagrams
-
CP6-C9 10
Mobile
Kit
Assem.bly
-
Safety
Practices
Guarantee
Card
STANDARD
UNIT
The construction of the standard package plant has been designed
for installation and operating
in
a
wide variety of applications,
such
as high production factories and general fabrication shops.
"WELDMATIC"
Plants consist of three basic
units:-
l,
Constant Potential Rectifier Power Source.
2.
Semi-Automatic Wire Feeder.
3,
Welding
Gun
and Cable Assembly.
Separate operating and maintenance instructions are provided
for the wire feeder and gun cables.
1.
-
POWER
SOURCE
-
FEATURES
The standard
C.P.
rectifier power source
is
housed
in
a
drip-
proof enclosure.
Lifting
lugs
are provided for crane trans-
portation. For
units
with
wheel mounting four solid rubber
tyred wheels are provided: the two front wheels are steerable
permitting easy movement
in
restricted floor space.
A
push
bar
is
provided
on
the
front
of the machine and
a
gas cylinder
carrier
with
a support bracket and chain
at
the rear.
A
110
volt plug socket is located
on
the rear panel
for
connection
of gas preheater when welding
with
C02
gas shield. Located
on
the front panel are
a
coarse voltage selection switch, fine
voltage selection switch, power
ON/OFF
switch, control fuses,
wire feeder
plug
socket and rectifier power outlet sockets.
2.
CONSTRUCTION
The power source
is
a Constant Potential Silicon Diode Rectif-
ier
B.C.
Welder,
with
a three phase transformer and
a
three
phase rectifier bridge. Connected
in
the
output circuit
is
an
inductance
unit
providing the "inductance" or degree of slope
necessary for various welding currents. Cooling
of
the sili-
con diodes, transformer windings and inductance
unit
is by a
single phase axial fan. The power source
is
protected against
fan failure and overheating
by
thermostats mounted on diode
heat sinks.
3.
WELDING
PROCESS
Gas metal arc welding
within
the capacity
of
the power source
can be carried
out
with
tke
following equipment:-
a) Semi-automatic
wire feeder model
W14.
b)
Semi-automatic
wire feeder
with
spot timer
W14-20.
c) "Hobart" spool
gun welding
unit
model
SP9
with
CV2
d)
"Mini-mig" push and
pull
gun
and control.
controller.
4.
WELDING
CAPACITY
Power Source Capacity
is
as follows:-
600
Amps, 42 volts,
100%
duty
cycle.
-1
-2-
5.
SUPPLY
AND
WELDING
CABLES.
Power
Sources
are
suitable for connection
to
a
415 volt 50
Hertz
3
phase supply.
The recommended fuse
size,
primary
cable
size and welding
cable
size
are
as
follows:-
a)
Fuse
-
50
amp.
b)
Primary
Cable
-
4 core 77/0.40
T.R.S.
c)
Welding
Cable
-
998/0.30
T.R.S.
6.
SHIELDING
GASES.
a) Welding
Grade
C02
for
a11
mild
and alloy
steel
welding in
"
thicknesses ranging
from
lmm
upwards.
b)
Argon/C02
or
Argon/Oxygen mixtures
for
all
applications on
low
currents requiring minimum
of
spatter on sheet
steel
and
for
stainless
steel
welding.
c)
Argon/Oxygen and
Argon/C02
mixtures
for
prime
quality
weld-
ing
of
stainless
steel.
d)
Argon (pure)
for
all
aluminium. welding.
7.
§ETTING
UP
UNIT
FOR
OPERATION.
a)
-
General
Assembly
of
Packaqed
Plant
(Refer
Drawing
AM1.16)
The
Rectifier
Welder
is
shipped
with
the
skids
or
wheels
unbol-
ted.
Bolt
on
the
wheel
assemblies
with
the
steerable
(swivel)
wheels nearest the front panel and push
bar.
If
a
"Mini-Boom"
wire
feeder mounting
is
supplied,
locate
the vertical
boom
post
in
the
special
swivel mount
at
the
rear
of
the machine.
Locate
the
Wire
Feeder on the swivel mount, ensuring that the
fibre
thrust washer
is
on the
pivot
pin.
Check
that
the
"Wire
Feeder"
is
free
to swivel in
all
directions.
If
necessary
apply
a
small
am.ount
of
graphite
grease
to
shaft.
b)
Connection
to
Mains Supply.
Note:
This
work
should only
be
done by
a
qualified electrician.
The power source
is
designed
for
connection
to
415 volt,
50
hertz,
3
phase
supply
and
the
supply voltage should
be
ascert-
ained
before
connecting the machine.
Access
to
supply connec-
tion
terminals
in
machine may
be
gained by door in right hand
side
panel.
Use
a
flexible 4
core
primary
cable
for
portable
machines and
clamp
cable
to
ensure that
there
is
no strain on
cable
connections. The
earth
(or
ground) connection (green/
yellow) must
be
securely fastened to
the
'earth'
terminal
on
the machine adjacent
to
the supply connection terminals.
CAUTION
Before
inserting primary
cable
plug in mains supply
socket:
ensure that
switch
on
both
plug
socket
and welding
machine
is
in
'OFF'
position.
-
3-
c)
"
CONNECTION
OF
CABLES/HOSES,
ETC.
With unit switched
'OFF'
connect control
cable
(6
pin plug)
from
power
source to
wire
feeder.
Connect
gas
hose from
wire
feeder
to
gas
regulator/flowmeter, ensuring
all
connections
are
tightened firmly.
If
C02
Gas
Shield
is
being used, plug
heater
into
110
volt
socket
at
rear of
unit.
Next
insert gun
cable
into
socket
of
wire
feeder
output guide and retain in place
with
set
screw
provided.
Set
screw
should not
be
tightened
so
as
to
prevent gun
cable
from swivelling. Connect
"Gas
Hose"
and "Gun Switch"
leads
to
respective sockets.
d)
WELDING
CABLES.
All
G.M.A.
welding
is
done
with
electrode
wire
connected to
"positive"
pole
comrn.only known
as
D.C.
reverse polarity
(D.C.R.P.)
therefore, connect the short jumper
lead
from
'I+''
socket on
machine
to terminal lug on gun
cable.
The work lead
("negative") should
be
plugged into
the
'I-''
socket on
the
machine. The plugs of the welding
cables
must
be
fully inserted
in the
sockets,
to
prevent accidental disconnection.
To
avoid
error,
welding should not
be
attempted
until all connections
have
been
secured. The
wire
feeder may
be
installed
remote
from
the
power
source, in
which
case,
extension
lead
sets
comprising
power
cable,
gas
hose
and control
cable
(four
core)
are required
in accordance
with
the
desired
length. Standard length
avail-
able
from
stock
is
9
m.etres.
3)
WIRE
FEEDER
AND
GUN
CABLE.
Fit
a
spool
of
wire
to
the
wire
feeder
(see
notes in
"Wire
Feeder Instruction Manual"). Tighten the
"brake"
screw
until
a
slight braking
effect
is
felt when turning the
wire
spool
by
hand
to
prevent "over-run" when
wire
feed
stops.
The
wire
drive
rolls
and
inlet
wire
guide should
be
selected
in accordance
with
the
diameter
and type
of
wire
being used.
Refer
to
current
wire
feeder manual
for
correct
selection
of
wire
feed
rolls
and input
guides.
0.8mm.
=
0.030"
1.6m
=
1/16"
0.9mm
=
0.035"
2.4m
=
3/32"
1.2mm
=
0.045"
3.2m
=
1/8"
The
gun
cable
and gun
are
normally delivered with
the contact
tip
and
liner spring
for
wire
size
nominated, but
check
that
both
are
correct
size for
wire
being used.
8.
-4-
WELDING
OPERATION
INSTRUCTIONS
SINGLE
FUNCTION
CHECK
Unit
is
now
ready
for
operation, but
prior
t
o
commen
ina,
the followins "functions check''
is
recommended,
cing
weld-
switch on
poGer source and check
air
flow.
See
that
all
welding lead
plugs
are
inserted
in
the
correct
polarity
sockets
-
electrode
"positive"
,
work
"negative". Check
all
welding connections
and plugs for tightness particularly "work"
clamp.
Next
ensure that
all
control
cables
and
gas
hoses
are
securely
connected and that
Gas
Heater
(for
C02
only)
is
plugged into
socket
at
rear
of
power
source. Switch on
wire
feeder,
indic-
ator
light should now
show
"Power On". Open
Gas
cylinder fully
and check contents gauge
for
adequate gas supply.
Press
"Gas
Purge" switch and
set
gas flow in accordance with
welding requirements,
at
the
same
time
check that
gas
flow
is
adequate
from
gun nozzle,
Set
"wire
speed" control
to
desired
wire
speed.
Press
"wire
inch" switch and check
wire
feed
for
correct
pressure on drive
rolls.
Pressure should
be
sufficient
to
prevent any ''slip" when feeding through gun and cable.
Next,
close
gun switch momentarily
for
wire
feed,
gas
flow
and
welding
power
check.
Set
the voltage
selector
switches in
accordance
with
required
voltage
(see
welding
table),
unit
is
now ready
for
welding.
The
welding current
is
determined automatically by
"Wire
Speed".
The electrode
wire
is
fed
at
the pre-selected
speed
by the
drive rolls through the gun
cable
to
the
arc
at
a
constant
speed,
unchanged
except
when
reset
by the
"Wire
Speed"
control. The
higher the
wire
speed,
the higher the welding current,
as
will
be
indicated by
the
ammeter.
The
output voltage
of
the power
source, indicated by the voltmeter when
the
gun switch
is
closed,
is
divided into
a
number
of
steps
by
Coarse
Selector
and Fine
Selector
switches.
The CP6
has
Coarse
Voltage
and
Fine Voltage Switches, each with
six
steps,
giving
36
voltage
settings for the machine. The
inductance terminal
sockets
are
numbered
''1
-
4".
No.1
socket
should
not
be
used for welding currents
over
300
amps.
Depend-
ing on the type
of
welding conditions, various inductance values
are
required. The typical
weld
setting chart indicates the
recommended sockets for various welding conditions.
As
a
general
rule, low welding currents require inductance
No.
1
or
2.
For
aluminium and tubular flux cored
wires,
inductance socket
No.
2
is
used exclusively.
-5-
The following sequence
of
weld setting
is
recommended:-
a) Consult typical weld setting chart.
b)
Select welding current most suited
to
the application
by
following the settings of wire speed and voltage shown on the
setting chart.
To
"tune" each weld setting, adjust wire
speed only.
c) If voltage
is
too low for the application, wire "stubbing"
will
occur, particularly at start of weld and weld contour
will
be very convex.
If
the voltage
is
too high, metal
transfer
will
be erratic
with
excess spatter.
d)
With
welding current and voltage matched the result
will
be an optimum tuned welding condition
with
a smooth spatter-
free arc.
10.
SAFETY
DEVICES
In
the event
of
the power source becoming overheated the ther-
mostats on the diode heat sinks
will
operate preventing further
welding. The thermostats
will
automatically reset and
with
the cooling fan operating
this
will
take approximately
10
min-
utes.
A
check should be made to ascertain the reason for the
over-heating such
as
fan not operating or air flow restricted.
Fuses provided for all circuits are as follows and are
indicated on the front panel:-
Fuse
El
-
3
amps
(Delayed
action)
Fuse
E2
-
3
amps
(
'l
'I
1
Fuse
E3
-
5
amps
(
'I
'I
1
Fuse
E4
-
5
amps
(
'I
'I
1
11
.
ENT
ENANC E
a)
Power Source
Apart from the fan the rectifier has no rotary components.
To achieve complete dissipation of heat from the active com-
ponents, the rectifier should be thoroughly blown off
with
dry
compressed air after
6
months' operation. Cleaning should
be carried out at shorter intervals if
dust
accumulation
is
considerable.
Prior
to
cleaning, remove the
unit
cover
by
detachment
of
lugs
and
the fixing screws. Thus
a11
the components of the power
source
will
bs
accessible.
b)
The wire feed motor/gearbox
is
pre-packed
with
grease and
needs no other lubrication. Change the grease after approx-
im.ately
14,000
service hours. (see Wire Feeder Instruction
Manual
.
The drive rollers
and
the inner
wire
guides
should
be kept
clean.
If
necessary,
blow
off
the inside
of
the
wire feeder
with
compressed air.
-6-
c)
Gun and
Cag
Remove any
spatter
which
might
adhere
to
the
nozzle
bore
so
that
the
shielding gas outflow
is
not
impeded.
The
condition
of
the
contact tubes should
be
regularly checked.
Damaged
and/or burnt
tubes
are
an impediment
to
trouble-free welding
operation and should
be
replaced immediately.
Trouble-free operation
depends
to
a
large extent on
the
good
condition and cleanliness
of
the inner
wire
liner
(See
Instr-
uctions on Gun
Cables).
12.
WELDING
OPERATION
Never observe
the
arc
with
unprotected eyes.
It
is
of impor-
tance that the
welder
wear
protective clothing providing
sufficient safety.
13.
STOPPAGES
AND
THEIR
ELIMINATION
The machine should
be
checked only by
a
fully
skilled
electr-
ician.
If
the
unit stops working,
first
determine whether stoppages
are
initiated by
the
mains
(for
instance, burnt fuse)
or
by
the
supply
cable
(loose connection,
cable
break)
or by
the
unit proper.
If
the three terminals
L1,
L2
and
L3
on
the
primary terminal
board
are
correctly connected to
the mains (voltmeter reading)
the cause of the stoppage must
be
sought in the unit
itself.
The wiring diagram on the next pages
will
facilitate the
location
of
the
defect.
-7-
WELDING
DATA
-
TYPICAL
VALUES
Shielding Gas
is
welding
Grade
C02
used
with
a
Gas
Preheater.
Contact Tip 1.5m inside
of
Gas Nozzle.
Wire
"Stick
Out"
6
-
9m.m
up
to
200
amps.
12
-
19mm
over
200
amps. These Tables
are a guide only for initial machine setting and finer
adjustments may be necessary
to
achieve optimum welding
characteristics for
the
application. Recommended machine
setting method
is
to
set
Voltage
Switches,
Inductance and Gas
Flow as per Table then adjust
wire
speed to obtain recommended
current.
:ect-
fier
JP6
Wire
Size Gas
0.9m
(Solid
Wire)
1.2m.
(Solid
Wire)
10
Lit./Min
(for
vertical Down)
15
Lit./Min
1.6mm
15/17
(Fluxo-
Lit./Min.
fil)
2.0m.
(Fluxofil)
2
.
4mrn
(Fluxofil)
Wire
Speed
Metres
Per
Min.
3.9
6.3
2.2
3.2
4.4
5.7
5.8
7.6
9.0
10.0
5.1
6.4
5.5
6.6
Coarse
-
2
2
2
3
3
3
3
4
5
5
5
5
5
6
4
1
190
4
2
200
2
3
250
2
2
330
3
2
360
4
2
380
5
2
450
6
2
500
1
2
550
Volt
18
21
20
21
22
23.5
26
27
31
32
33
34
34
35
NOTE:
Wire
speed
is
shown
in
metres/minute and are not dial
calibration settings.
-
I
TEP
NO.
-
2
2.1
2.2
2.3
3
3.1
4
4.1
4.2
5
S
9
18
21
22
24
25
26
26.1
27
28
29
30
32
33
34
37
38
39
40
37.1
37.2
8
DRAWING
NO.
CP6-02
-
SPARE PARTS LIST ISSUE
5.
PART
NO.
CP6-5
CP6-5/2
CP6-5/3
CP3-9/8
CP6-8
,
CP6-19
CP6-2
CP6-7/1
CP6-7/2
CP25-0/7
CP3-0/4
14235-0/6
CP15-0/7
CP5-25
CP5-0/19
AM1
6
CP15-0/14
TC262
TC262N
CP3-0/47
CP6-0/35
w1-22
CP6-0/47
CP5-0/13
CP5-0/14
CP5-0/15
W1-23
CP22-3/13
CP6-20
CP6-21
K10
K11
DESCRIPTION
RECTIFIER ASSEMBLY
DIODE
DIODE (R)
THE
R?.!lOS
TAT
TRANSFORMER ASSEMBLY
PRIMARY/SECONDARY COIL
INDUCTANCE ASSEMBLY
LEFT
HAND
INDUCTANCE COIL
RIGHT
HAND
INDUCTANCE COIL
CONTROL TRANSFORMER
FAN
BLADE
FAN
MOTOR
GAS
HEATER PLUG SOCKET
RECTIFIER PROTECTION ASSEMBLY
WELDING CONTACTOR
OUTPUT TERMINALS
CONTROL PLUG
GAS
NIPPLE
GAS
NIPPLE NUT
VOLTMETER 0-60V.
AMPETER 0-800A.
INDICATOR LIGHT
APNTER SHUNT 0-800A
POWER
ONYOFF
SWITCH
COARSE VOLTAGE SWITCH
FINE VOLTAGE SWITCH
FUSE HOLDER
STAND
OFF
INSULATOR
RESISTOR
SERIES RESISTOR
3AG.
3A
DELAY FUSE
3AG.
5A
DELAY FUSE
6
0 0
0
0
C
b
SAFE
PRACTICES
IN
UStNG
WELDING
EQUIPMENT
These notes are provided in the interests
of
improving operator safety. They should be considered
only as a basic guide
to
Safe Working Habits.
A
full list
of
Standards pertaining
to
industry is available
from the Standards Association of Australia, also various State Electricity Authorities, Departments of
Labour and Industry or Mines Department and other Local Health or Safety Inspection Authorities may
have additional requirements.
EYE PROTECTION
NEVER
LOOK
AT
AN ARC WITHOUT PROTECTION. Wear a helmet with safety goggles or glasses
with side shields underneath, with appropriate filter lenses protected by clear cover glass. This is a
MUST for welding, cutting, and chipping to protect the eyes from radiant energy and flying metal.
Replace the cover glass when broken, pitted, or spattered.
WELDING
CURRENT
SHADE
NUMBER
Below
30
Amps
.......................................
6
30
-
75
Amps
.........................................
8
75
-
200
Amps
.......................................
10
200
-
400
Amps
......................................
12
Above
400
Amps
.....................................
14
BURN PROTECTION.
The welding arc is intense and visibly bright.
Its
radiation can damage eyes, penetrate lightweight
clothing, reflect from light-coloured surfaces, and burn the skin and eyes. Burns resulting from gas-
shielded arcs resemble acute sunburn, but can be more severe and painful.
Wear protective clothing
-
leather or heat resistant gloves, hat, and safety-toe boots. Button shirt
collar and pocket flaps, and wear cuffless trousers
to
avoid entry of sparks and stag.
Avoid oily or greasy clothing. A spark may ignite them. Hot metal such as electrode stubs and
workpieces should never be handled without gloves.
Ear plugs should be worn when welding
in
overhead positions or in a confined space. A hard hat
should be worn when others are working overhead.
Flammable hair preparations should not
be
used by persons intending to weld or cut.
TOXIC
FUME
PREVENTION.
Adequate ventilation with air is essential. Severe discomfort, illness or death can result from
fumes, vapors, heat,
of
oxygen depletion that welding or cutting may produce. NEVER ventilate with
oxygen.
Lead, cadmium, zinc, mercury, and beryllium bearing and similar materials when welded or cut
may produce harmful concentrations of toxic fumes. Adequate local exhaust ventilation must be used,
or
each person in the area as well as the operator must wear an air-supplied respirator.
For
beryllium,
both must be used.
Metals coated with or containing materials that emit fumes should not be heated unless coating is
removed from the work surface, the area
is
well ventilated, or the operator wears an air-supplied
respirator.
Work in a confined space only while
it
is
being ventilated and,
if
necessary, while wearing air-
supplied respirator.
Vapours from chlorinated solvents can be decomposed by the heat of
the
arc (or flame)
to
form
PHOSGENE,
a highly toxic gas, and lung and eye irritating products. The ultra-violet (radiant) energy
of
the arc can also decompose trichlorethylene and perchlorethylene vapors
to
form phosgene.
Do
not
weld or cut where solvent vapors can be drawn into the welding or cutting atmosphere or where the
radiant energy can penetrate
to
atmospheres containing even minute amounts
of
trichlorethylene or
percholorethylene.
FIRE
AND
EXPLOSION
PREVENTION.
Be aware that flying sparks or falling slag can pass through cracks, along pipes, through windows
or doors, and through wall
or
floor openings, out of sight of the operator. Sparks and slag can travel up
to
10
metres from the arc.
Keep equipment clean and operable, free of oil, grease, and (in electrical parts) of metallic
particles that can cause short circuits.
If
combustibles are present in the work area,
do
NOT
weld or cut. Move the work
if
practicable,
to
an area free of combustibles, Avoid paint spray rooms,
dip
tanks, storage areas, ventilators. If the work
can not be moved, move combustibles at least
10
metres away out of reach of sparks and heat; or
protect against ignition with suitable and snug-fltting fire-resistant covers or shields.
Walls touching combustibles on opposite sides should not be welded on
or
cut. Walls, ceilings,
and floor near work should be protected by heat-resistant covers or shields.
A
person acting as Fire Watcher must be standing by with suitable fire extinguishing equipment
during and for some time after welding or cutting
if;
R
Combustibles (including building construction) are within
10
metres.
m
Combustibles are further than
10
metres but can be ignited by sparks.
R
Openings (concealed or visible) In floors or walls within
10
metres may expose combustibles
m
Combustibles adjacent
to
walls, ceilings, roofs, or metal partitions can be ignited by radiant
or
After work is done, check that area is free
of
sparks, glowing embers, and flames.
to
sparks.
conducted heat.
An tank or drum which has contained combustibles can produce flammable vapors when heated.
Such a container must never be welded on or cut, unless
It
has first been cleaned as described in
AS.
1674-1 974,
the
S.A.A.
Cutting and Welding Safety Code. This includes a thorough steam or caustic
cleaning (or a solvent or water washing, depending on the combustible’s solubility), followed by
purging and inerting with nitrogen or carbon dioxide, and using protective equipment as recommended
in
AS.1674-1974.
Water-filling just below working level may substitute for inerting.
Hollow castings or containers must
be
vented before welding or cutting. They can explode. Never
weld or cut where the air may contain flammable dust, gas, or liquid vapours.
SHOCK
PREVENTION.
Exposed conductors or other bare metal in the welding circuit, or ungrounded electrically alive
equipment can fatally shock a person whose body becomes a conductor. Ensure that the machine is
correctly connected and earthed.
If
unsure have machine installed by a qualified electrician. On mobile
or portable equipment, regularly inspect condition
of
trailing power leads and connecting plugs.
Repair or replace damaged leads.
Fully insulated electrode holders should be used.
Do
not use holders with protruding screws.
Fully insulated lock-type connectors should be used
to
join welding cable lengths.
Terminals and other exposed parts of electrical units should have insulated knobs or covers
secured before operation.
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