ESAB Heliarc 250 Instruction Manual page 13

SECTION 3
Tungsten Electrodes
Welding Currents (Amps)
ACHF
Electrode Using pure Using
Diameter Tungsten thoriated
(Inches) electrodes electrodes
0.020 5-15 5-20
0.040 10-60 15-80
1/16 50-100 70-150
3/32 100-160 140-235
1/8 150-210 225-325
5/32 200-275 300-400
3/16 250-350 --
1/4 -- --
REMOTE Position -- permits current regulation
from a remote location by connecting either the
Foot or Torch control options to the Remote Control
receptacle (RCC). Note that welding current
regulation from the remote control option is
"always" limited to the maximum current that
you preset on the power source main Current
Control potentiometer. For example: if the main
potentiometer is dial-set at 50, the remote potenti-
ometer will provide full range, finer tuned current
values up to the equivalent dial setting of 50 on the
DCSP DCRP
Using pure or
thoriated tungsten
electrodes
5-20 --
15-80 --
70-150 10-20
150-250 15-30
250-400 25-40
-- 40-55
-- 55-80
-- 80-125
3-4
main pot; however, if you want complete remote
current control operation, the main potentiometer
on the power source must be dial-set at 100 (or
maximum) on the dial.
10. Depending on your welding application, place the
High Frequency Selector switch in the START or
CONTINUOUS position.
11. Set the POSTFLOW control to provide the desired
interval of post-flow shielding gas (from 5 to 30
seconds) after the welding arc voltage is broken.
12. Place the Power ON-OFF switch to the ON posi-
tion. This will immediately energize the power source
up to its solid state contactor.
13. To establish the welding arc, position the torch
electrode near the workpiece (i.e., 1/8" typical) and
close the Remote Torch or Foot Control. This will
energize the solid state contactor and provide high
frequency and welding current to initiate the arc.
14. If necessary, readjust the panel or remote Current
Control until you secure the exact condition de-
sired.
OPERATION
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