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and perchloroethylene, to form phosgene, even
when these vapors are present in low concentra-
tions. Do NOT weld where chlorinated solvents
are present in atmospheres in or around the arc.
c. Do NOT touch the electrode, contact tip or metal
parts in contact with them when power is ON; all
are electrically energized (HOT) and can cause a
possibly fatal shock. DO NOT allow electrode to
touch grounded metal; it will create an arc flash
that can injure eyes. It may also start a fire or
cause other damage.
d. When working in a confined space, be sure it is
safe to enter. The confined space should be tested
for adequate oxygen (at least 19%) with an ap-
proved oxygen measuring instrument. The con-
fined space should not contain toxic concentrations
of fumes or gases. If this cannot be determined,
the operator should wear an approved air supplied
breathing apparatus.
Avoid gas leaks in a confined space, as the leaked
gas can dangerously reduce oxygen concentra-
tion in the breathing air.
DO NOT bring gas cylinders to confined spaces.
When leaving a confined space, shut OFF gas
supply at the source to prevent gas from leaking
into the space. Check the breathing atmosphere
in the confined space to be sure it is safe to reen-
ter.
e. Never operate the equipment at currents greater
than the rated ampere capacity; over-heating will
occur.
f.
Never operate equipment in damp, wet or confined
areas without suitable insulation for protection
against shock. Keep hands, feet and clothing dry
at all times.
g. Whenever the equipment is left unattended, turn
all control and power source switches and gas sup-
plies OFF and open the main line switch.
h. Wear dark substantial clothing to protect exposed
skin from arc burn, sparks and flying hot metal.
i.
Turn off welding power before adjusting or replac-
ing electrodes, contact tips, nozzles, or contact tip
adaptors.
3.2 PRE-WELD REQUIREMENTS
Before welding, refer to feeder manual for pre-weld re-
quirements and checklist. Also check that:
a. Correct size liner, guide tube, contact tip and nozzle
are installed and uncontaminated by dirt or spat-
ter.
b. Wire is properly threaded through gun.
c. Nozzle is free from excessive spatter.
If all pre-weld requirements have been met for feeder
and torch, turn on all required power controls and pro-
ceed to weld.
For argon shield gas applications, copper nozzles
should be used in place of brass nozzles.
When the POWER is ON, and torch trigger is de-
pressed, the electrode wire becomes electrically
HOT. Do NOT touch the wire as it may cause a
possibly fatal shock. Do NOT allow wire to touch
grounded metal surfaces other than the work to
be welded.
3.3 WELDING PROCEDURE
a. On each new application, weld trial pieces of simi-
lar metal to determine any necessary welding ad-
justments.
b. When the trigger is squeezed, weld wire feeds con-
tinuously into the arc and the resulting weld puddle
is protected by the shielding gas. Protect the arc
from strong drafts which can disrupt shielding gas
coverage and cause porous welds.
Correct torch position, and coating of an anti-spat-
ter compound on all torch surfaces exposed to
spatter, reduces spatter accumulation.
Keep hoses, and cables from touching hot metal.
Do not lay torch down on hot metal.
c. To stop the arc, release the trigger.
Release the trigger, pull torch away from work only
far enough to prevent welding wire from freezing
in weld puddle. Gas will continue to flow for a short
period.
d. When putting torch down, comply with (Step c) and
CAUTION in next paragraph.
12
IMPORTANT
NOTE
IMPORTANT
NOTE
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