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 TM 55-1905-223-10
Table 2-1. Description of Operator's Controls and Indicators - CONT
Key
Control or Indicator
Function
Electric Welding Machine (FIGURE 2-64) - continued
12
START CURRENT
Provides starting current selection, which is
in effect for approximately the first second of
the weld. After this time period, the weld
current goes to the setting of the weld current
control.
13
AC
Switch selects either ac (AC), dc straight
DCSP
DCRP
(DCSP), or dc reverse polarity (DCRP) without
changing the secondary cable connections.
14
ELECTRODE
Terminal to contact the electrode holder to the
welding machine.
15
OUT
Provide fresh water cooling for the electrode
WATER
holder.
16
IN
Supply connection for fresh water for the
WATER
electrode holder cooling system.
17
OUT
Provides gas (argon or helium) to the electrode
GAS
holder.
18
IN
Supply connection for gas to the welding machine.
GAS
19
WORK
Terminal to connect the WORK or ground cable
between the welding machine and the item being
welded.
20
A/C BALANCE
Rotate control clockwise from the 50/50 balance
to more straight polarity, less tungsten heating
results and higher welding current may be
applied to obtain more penetration. Rotate
control counterclockwise toward 50/50 balance
point, more reverse polarity, more tungsten
heating and cleaning action are provided.
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