TM 5-34131-2215-15
(2) Refer to figure 3-6 and remove the
continue to flow after the arc has been broken.
power switch.
This timer should be set so that the gas flow con-
b. Installation.
tinues for a sufficient length of time to allow
(1) Refer to figure 3-6 and install the pow-
the tungsten to cool to a point where it will no
er switch.
longer be contaminated when exposed to the air.
(2) Install the top and side panels on the
This time setting is usually ten (10) seconds for
welding machine (para 3-26).
each 100 amperes of welding current being used.
f. The Start Circuit Switch is a two position
3-30. Standard-Remote Switches
switch provided for starting current control and
is located behind the lower front access door.
a. Removal.
The switch is labeled Start Circuit In-Out and
(1) Remove the top and side panels from
provides the operator with a selection of connect-
the welding machine (para 3-26).
ing the starting current control circuit either in
(2) Refer to figure 3-7 and remove the
or out of the welding circuit. Placing the switch
standard-remote switch.
in the "IN" position connects the starting cur-
b. Installation.
rent control in the welding circuit. Placing the
(1) Refer to figure 3-7 and install the
switch to the "OUT" position removes the start-
standard-remote switch.
ing current from the welding control circuit. The
(2) Install the top and side panels on the
welding machine (para 3-26).
Start Adjustment Control is labeled "Increase-
Decrease" and is used to control the welding arc
when starting to weld. The start circuit consists
of time delay components which allows preset
a. Removal.
starting current to flow for approximately 35 to
(1) Remove the top and side panels from
40 cycles (2/3 of a second). After the time delay,
the welding machine (para 3-26).
current will automatically change to the current
(2) Refer to figure 3-7 and remove the high
setting of the Weld Current Adjustment Control.
frequency switch.
To avoid burn-through on light gage metals, the
b. Installation.
start-Adjustment Control should be set in the
(1) Refer to figure 3-7 and install the high
counterclockwise direction at a lower setting than
frequency switch.
the Weld Current Control. If the Weld Current
(2) Install the top and side panels on the
Control is near the zero setting of its range, it
welding machine (para 3-26).
may be well to change the Range Switch to the
next lowest range setting, if a lower range is
available. For heavy gage metals, a full clockwise
setting or higher than the Weld Current Control
setting is recommended as a higher starting cur-
rent is required to preheat the metal at the begin-
ning of the weld.
Caution: Do not operate the welding ma-
chine wit h the "Standard-Remote" Switch in the
"Remote" position unless a Remote Control is
plugged into the receptacle. Failure to heed the
caution stated above may result in damage to
the switch and/or dc control coil. Removing the
Remote Control plug from the Remote Amper-
age Control Receptacle, with the welding ma-
chine in operation, and with the switch in the
"Remote" position will have the same adverse
effect.
3-29. Power Switch
a. Removal.
(1) Remove the top and right side panels
f r o m welding machine (para 3-26).
