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Trouble
Erratic arc
Porosity in weld.
SECTION 6 − ELECTRICAL DIAGRAMS
When using DC, check polarity, and/or polarity of welding cables.
When using AC, check welding power source High Frequency control setting, and be sure it is operating
continuously.
Select proper size and type tungsten. Properly prepare tungsten according to Section 7.
Use proper arc length. Arc length may be too long or too short.
Make sure base material is clean and free of contaminates.
When using AC, slow travel speed can cause erratic arc. Adjust travel speed.
Check for proper gas flow rate. Check manufacture's recommendations.
Check and tighten gas fittings.
Make sure base material and filler material is clean and free of contaminates.
Check for impurities and moisture in gas lines. Purge if necessary.
If torch is water cooled, check torch and cables for water leaks. Repair or replace if necessary (see Sec-
tion 5-1).
BROWN
GREEN
Torches With Single Trigger
GREEN
WHITE
BROWN
Torches With Double Trigger
GREEN
BROWN
WHITE
YELLOW
GREY
PINK
Torches With Trigger And Potentiometer
Remedy
MAINTAINED (LATCHING) SWITCH
INCREASE
POTENTIOMETER
OM-251981 Page 11