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Looks like you may be movig a bit fast, you may wish to slow the torch a little. Try to be more even with the filler dabs to get a nicer appearance as well. With stainless you should be back gassing the weld with argon or using flux to prevent the weld from crystalizing and becoming brittle.
Millermatic 375 xtreme
And a brand new Syncro 200!!!
Fusion , as in no filler ?
Yes I tried that, welds look really nice , just didnt know it they would be strong enough to not crack down the road.
I was trying to move as fast as possible, as I read somewhere that if you overheat SS it burns the chrome out & turns the weld black.
Bead in pic has not been brushed yet, but definatly looks grey/black.
Does the color look OK ?
Am purging pipe with argon, It was nasty inside before ( my last post was about the sugaring inside pipe )
Yes, no filler. As long as the back purge or flux supports the root well the weld will be as strong as the base metal. If the root falls too much, causing a concave face, then the strength could be comprimised, but for an exhaust system, I don't think cracking would be an issue. I've never had problems.
What kind of machine are you using to weld up the exhaust?