OM-356 Page 28
4-13. High Frequency Control
Ref. ST-801 972
YDo not use high frequency while Shielded Metal Arc Weld-
ing (SMAW).
1 High Frequency Control
For GTAW, use control to set HF intensity. Set as low as possible.
Application:
If HF is present at the tungsten, the control is set high enough.
Arc rectification can occur when welding above 200 amps and/or
while welding with helium gas. If this condition occurs, increasing the
HF Intensity control towards maximum, may help to restabilize the
arc.
.As high frequency intensity is increased, the possibility of inter-
fering with local electronic devices, especially communication
equipment, also increases. Set control as low as possible to
avoid such interference.
1
4-14. Optional Sequence Controls
1 Sequence Selection Switch
See Section 4-15.
2 Start Time/Spot Time Control
See Section 4-16.
3 Start Current Control
See Section 4-16.
4 Crater Time Control
See Section 4-17.
5 Final Current Control
See Section 4-17.
Ref. ST-191 372
4
2
1
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4
21
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(CE Nameplate Only)