The copper sheet was used for starting an arc in DC Tig welding. Does not contaminate the tungsten as even steel will. Generally used on machines without a lift-arc feature.
As has been mentioned, Hi Freq is required for AC Tig welding. Without it (except for the inverters) the arc will extinguish as it passes thru 0 when switching from DC+ to DC-.
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Thread: bobcat 225 and tig alum
04-18-2009, 07:11 PM #11Senior Member
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- Deltaville, VA