[Justinhip]

I have a crazy setup that I build my stuff in. I have a mig out by my car and a tig in the basement. I bought a roll of 308 wire for my mig to tack my header tubes. I then planned to do the finish welding with my tig. I don’t plan to change my mig gas from argon/co2. Am I going to have a problem with the tack welds when I tig? It seems mig tack welds on mild steel seem to have some sort of contamination the tig doesn’t like, not sure about the stainless. Or is this a good old fashioned case of overthinking ???

Thanks

 

[INTMD8]

Not sure about mig and stainless. I always tack weld with the tig (fusion, no filler).

 

[225digger]

tack it all together, then tig a few sections to hold the position and then grind the mig tack off

 

[HoustonGlock]

tack it all together, then tig a few sections to hold the position and then grind the mig tack off

This ^

The contamination comes from lack of argon . Need to purge the tubes with a flow or argon to shield the arc.

Sent from my SM-N960U using Tapatalk

 

[Justinhip]

Yes I’m all set up to purge weld with the tig, already did the collectors.

Thanks for the help

 

[debo]

yes, youll have prob from the mig gas.. needs pure argon

 

[lowpro64]

You will NOT like running a TIG over top of a MIG. Lol.
Zim

 

[Slow66]

You will NOT like running a TIG over top of a MIG. Lol.
Zim

Its the worst! As was said, if I get something that's mig tacked that I have to tig, I'll definitely grind the mig tack off.