stainless steal sheading gas argon/co2 5% or flux core

[cable5one]

I know "the book" says for SS it's trimix gas but my gas supplier doesn't keep tri-mix (and I don't fancy dealing with BOC).
so my question is would argon/co2 5% keep the SS properties or is flux core my only option?
FYI I'd be welding 2mm SS

 

[chrismac]

I guess your going to be using MIG or Flux core if you cant get the shield gas? inital though is 2mm is thin for a mig set up but we dont know what your welding yet.

Inomaxx was the air products preferred option for mig, not sure what mix it was.

 

[Jack Ryan]

What about C2 or an oxygen mix?

I would have thought that a tri-mix containing helium would be too hot for 2mm

Jack

 

[MinMax]

Don’t go above 3% co2 when welding s/s as it causes carbide precipitation into grain boundaries resulting in inter granular corrosion

 

[BrokenBiker]

Personally I have used 5% with 308l wire, but I've never welded anything that needs to be 'strong'...now I'd tig it but ideally you want less than 3% co2 I think

 

[MinMax]

Personally I have used 5% with 308l wire, but I've never welded anything that needs to be 'strong'...now I'd tig it but ideally you want less than 3% co2 I think

Its the corrosion resistant properties of SS which would be affected by using 5% co2 ultimately also affecting the weld integrity (MAG welding) .
Do not TIG weld anything with any % co2 content ( unless you want welds full of porosity ) Argon with low levels of hydrogen ( up to 5%) will give you a better less oxidised finish than pure argon

 

[BrokenBiker]

Its the corrosion resistant properties of SS which would be affected by using 5% co2 ultimately also affecting the weld integrity (MAG welding) .
Do not TIG weld anything with any % co2 content ( unless you want welds full of porosity ) Argon with low levels of hydrogen ( up to 5%) will give you a better less oxidised finish than pure argon

I don't use any co2 with tig...I don't think anyone does...my comments were aimed at mig welding before I had the tig...