I'm using a Miller XMT 350 with a 70 series wire feeder.
I'm running .045 ESAB Shield-Bright 316L dual shield wire at their recommended settings of 24v and 300-350 ipm. It welds great for a little while then it starts burning back really bad, it sputters the burnback too so I'll be welding and it'll go from a nice buzzzzzz to zap-zap-zap...
The contact tip does not seem worn out or discolored nor am I running so long I'm overheating the gun. This setup running dual shield steel wire works fine no issues so I'm just wondering what I'm doing wrong.
Ballistic308
- Ballistic308
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Joined:Fri Jul 12, 2019 10:56 pm
If it’s still burning back, then perhaps turn the voltage down a bit or increase the wire feed speed. Maybe I’m missing something.
Delasangre
- Delasangre
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Joined:Fri May 17, 2019 9:42 am
I think I figured it out. I'm running slick V groove rollers. It looks like the wire has been slipping. I'm going to order a set of knurled dual shield rollers.