Hello Been a long time since I posted on this site and am glad that it still exist , have been TIG welding a long time , A/C , Aerospace and Medical , always used the older transformer rectifier technology , have been using a Harbor Freight auto darkening helmet for several years , not because of the price but just like the lightness and they work great , Lincoln put on a seminar and some field training at our county airport and I went along for the ride , I wanted to try one of the new inverter welders , I finally took my turn at a steel sample with D.C. and was shocked to find out that my auto darkening helmet would only stay engaged for about two seconds and the disengaged and let a lot of light in , I lit up a older TIG and showed the boys how to weld Alum. with no helmet problem , somebody mentioned that the Inverter was OK on A.C. Alum. and caused a problem on D.C., would like to hear a Tech. explanation of this phenomenon, Thanks Phil L.
11 years ago