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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)
1
POWER-OFF-ON
Controls the welding machine fan and control
circuitry, and places the welding machine in a
ready-to-weld status.
2
PRE-FLOW TIME
Provides a gas/water pre-flow potentiometer for
purging the torch and weld area of atmospheric
contaminants. Range of timer is from 0 to 10
seconds.
3
POST-FLOW TIME
Provides a switched potentiometer to control gas
and water post-flow to shield molten metal from
atmospheric contaminants. Post-flow can be set
from 5 to 50 seconds.
4
WELD CURRENT
Provides a means of selecting the exact weld
current desired within the range being used.
5
CURRENT RANGE
Provides the capability of selecting from two
amperage ranges. High range covers 5 to 375
amperes, and low range covers 5 to 125 amperes.
6
CURRENT CONTROL
Provides local or remote control of amperage
desired.
7
CONTACTOR CONTROL
Provides local or remote control of both the
contactor and gas and water.
8
HIGH FREQUENCY
Provides a dual function: to enable starting the
arc in gas tungsten arc welding (TIG) without
touching the electrode to the work, and to
stabilize the arc during welding operation.
9
CIRCUIT BREAKER
Provides 10-ampere circuit breaker protection for
control panel.
10
FUSE 2 AMPS
Provides 2-ampere fuse protection for control
panel.
11
SPOT TIME
Allows operator to set time for use of welding
machine in spot weld mode.
Change 1
2-161
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