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-.
Results 1 to 10 of 13
Thread: bobcat 225 and tig alum
04-18-2009, 06:11 PM #11Senior Member
- Join Date
- Mar 2007
- Deltaville, VA