ok so im in the middle of turbo charging my car and had to modify my downpipe its stainless not sure of what kind my question is that i tacked it in place using my wire feed but was told you have to tig weld it ? is this true or can i just have it welded up at a muffler shop ??
if i have to tig is anyone down to make some quick cash to throw down 2 welds please help

 

It can be MIGed. However, if a muffler shop does it pretty much guaranteed will come out looking like crap and with them using mild wire, which means that it will rust.

If it's TIGed by someone who knows what they're doing it will turn out nice and have stainless filler used.

 

There is also SS mig wire and we here in Latvia use AGAMIX gas which is 80% argon + 20% Co2, so, not so much of a rush

But TIGing would be a lot better especially if back purged...

 

You're right.

Understand I was talking about the muffler shop, not the ability to do it. Muffler shops here in the US do things as cheap as possible. These are people who will weld an exhaust so that it's one piece from the head to the tailpipe, no flex section. They MIG it... badly. And since their "custom" exhausts are pre-bent mild kits, they use standard MIG wire and do not have (or probably even know about) stainless.

IMO, go and get it done well.

 

Oh we have the same "type" of shops here too... but there are few good which will do everything how it needs to be even with mig

But definetly, if you have money, get it TIG welded!

 

^ Ah really? They're all chain shops here, and most of them suuuuck lol.

 

thanks for all the info now just to find someone to do it this weekend

 

The gas your talking about is just standard Argon Mix for mig welding Mild Steel. Here in the states we use 75/25 or 75% Argon and 25%Co2. Mig welding stainless does require SS filler but with a Tri-Mix gas that has a lower content of reactive gases such as co2. This preserves the corrosion resistant proprieties in the stainless. I don't mig weld stainless however this is what I learned in school.

 

I don't mig weld either... but as far as I know, we here in Latvia use usual Co2 for mig carbon steel and that argon mix for mig ss... I could be wrong though...

 

You can use 100% co2 for Mild Steel and the Argon Mix, but straight Argon/Co2 mix gas isn't supposed to be used for SS.