06-19-2018, 07:14 AM
what you describe is pretty much what i found doing cast aluminum
grind and prep squeeky clean only to have the weld turn up like crap with black and all
that.
preheat does a pretty good job getting the oils and other crap cooked out, but i found that
if i was to go over the weld area with the tig first without filler it was amazing how much crap would boil out and blacken the part.
i would do the first pass that way, then go back and regrind, brush and clean
reheat and go at it the final time with filler rod... nice clean weld then.
that was on cast, which is somewhat porous, maybe the treadplate gets some crap imbedded in it somehow?
grind and prep squeeky clean only to have the weld turn up like crap with black and all
that.
preheat does a pretty good job getting the oils and other crap cooked out, but i found that
if i was to go over the weld area with the tig first without filler it was amazing how much crap would boil out and blacken the part.
i would do the first pass that way, then go back and regrind, brush and clean
reheat and go at it the final time with filler rod... nice clean weld then.
that was on cast, which is somewhat porous, maybe the treadplate gets some crap imbedded in it somehow?