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Wondering if going to 100% CO2 would help since it's a 120 volt machine.
That's funny, I was going to suggest he try going the other direction, and try a bottle of C15 or C10 and .024" S3 wire. Hmmm . . . yeah, 16ga isn't all that thin, okay, never mind.
cut the wire speed back and turn up the heat if needed and spray arc it in pulses. you won't have any start and stops to grind down and it will look like a tig weld .
I have found that it is just a product of mig welding. Looks like a belly button.
That's a crater crack.
Backing over it or as eecervantes83 sez:
'Tack over it while it still red. Hot '
These are not only crack initiators seen on the weld surface
but can and do extend down thru the weld.
They are a BIG DEAL--not just from the visual cracking that
can be seen (microscopically)....but most of the time
will leak pressure on a pressure tight weld. If one's seal welding
then back over them or else grind and fair the stops and starts,
the go back, overlapping and doing the back step to wash over.
Every time I do a tack weld on a 16ga exhaust pipe it ends up having a small dimple in the middle of the tack. Is there a way to stop this I am using millermatic 140 autoset set at the charts recommendation, .030 solid wire with 75/25 mix. Any help would be great. Thanks
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