TM 5-3431-201-10
(5) Set the continuous current control to the desired
electrode is pulled away, the current will cut
amperes.
down to a lower figure, cooling the puddle and
letting the metal solidify. The "in" and "out"
(6) Strike an arc.
motion, combined with the normal whipping
(7) If the arc is too weak, turn the job, selector up.
technique, gives the operator complete control
If the arc is too cold, turn the current control up
over the puddle during vertical and overhead
10 or 20 amperes and turn the job selector
welding.
down.
(2) When welding down hand, or for sheet-metal
Caution:
application, no change of current is desired.
Do not maintain arc while changing
During welding for this purpose, the job selector
the current control.
should be set in the NORMAL WELDING or
(8) If, when the correct current is obtained, the job
LARGE ELECTRODE position. Little current
selector is positioned beyond the desired
change will result from lengthening or
setting, adjust the current control up and return
shortening the arc when the job selector is set in
the job selector to the desired setting, so that
this position.
the necessary arc can be produced.
Warning:
16. Operation in Extreme Cold (Below 0F.)
Do not perform a welding operation
a. General. This welding machine is designed to
without a welder's helmet. The flash
operate in temperatures as low as -65 F. To operate
of the welding arc can cause injury
successfully in cold weather, utilize the engine
to the eyes.
winterization heater. Refer to paragraph 13 for cold
weather starting.
(3) The recommended current setting per electrode
size is found in table II.
Caution:
Do not touch metal parts with bare
Table II. Recommended Current Per Electrode Size.
hands in extremely cold weather.
b.Engine.
Electrode Size
Current Range
(1) Lubrication. Lubricate the engine in accordance
(inches)
(amperes)
with the current lubrication order.
(2) Cooling system. Inspect the engine coolant to
5/64
40-75
be sure that it contains the correct amount of
3/32
65-100
antifreeze. Before adding the initial antifreeze,
1/8
90-140
clean and flush. the entire cooling system (par.
5/32
120-190
47). Inspect the cooling system components for
3/16
150-240
signs of leaks or other damage. Inspect the
shutter control for proper operation.
d. Dual Control. Dual control of amperage and
Caution:
voltage can be accomplished by the use of the job
Do not bend or kink coolant hoses
selector and the continuous current control. The dual
during cold weather. Rubber hoses
control is utilized by the following steps:
will become brittle in extreme cold
(1) Place the polarity switch (fig. 4) in the OFF
and break with excessive handling.
position.
(3) Fuel system. Keep the fuel tank as full as
(2) Start the engine (par. 13) and allow it to warm
possible at all. times to prevent condensation.
up.
Any water that forms in the fuel tank will be
carried to the fuel filter. It may be necessary to
(3) Place the polarity switch in the ON position.
drain the fuel filter more frequently than under
(4) Set the job selector (fig. 4) to the desired
normal conditions.
marked position of the dial.
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