today had to weld 70 dia shaft into 16 mm thick flange preped back weld only it is a mounting pin for mine service tanker.
we preheat to 100 c then two run mig weld and cool in lime.
my questions are -why preheatand why cool in lime my understanding so far is ,moisture in metal, difference...
hi can you clamp on a copper stiker plate right next to weld start arc on that and run straight into the weld.
other than that ,are you sharpening to a point and what amp range, high amps and sharp point will lose the end off the electrode you could try sharpening to point then just flaten very...
