Noob here looking for advice on mig welding 304 stainless exhaust piping

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I'm wanting to fabricate/weld a 304 stainless exhaust for my car with my little 140 mig welder and was wondering what's the best way to go about this?  The only shielding gas I currently have is 75/25 and I'm not really looking to spend a ton of money on some tri mix gas for this little project so what are my options?  The exhaust piping is 16 to 18 gauge.My original thought was to just tack weld it together and then take it somewhere to have it professionally tig welded but even doing that, I'm not sure what wire to use.  From what I've read it appears I need to use a 308 wire but do I try using a solid wire or flux cored wire and what size do I use?Thanks for the help.Last edited by jestang; 02-25-2015 at 10:23 PM.
Reply:Gas is pretty cheap, especially if you are considering having professionally welded. You are looking at 65-100 an hour for that, at about 3-8 hours depending how many joints/welds you are talking.  I think a small bottle of gas will be about $60, tops.  If you will take it to somebody, you should use .030, solid core wire.Constant Current Weldor.
Reply:Jestang. Where are you located? Someone on this forum would most likely love to hook you up with a fair deal
Reply:Originally Posted by jestangI'm wanting to fabricate/weld a 304 stainless exhaust for my car with my little 140 mig welder and was wondering what's the best way to go about this?  The only shielding gas I currently have is 75/25 and I'm not really looking to spend a ton of money on some tri mix gas for this little project so what are my options?  The exhaust piping is 16 to 18 gauge.My original thought was to just tack weld it together and then take it somewhere to have it professionally tig welded but even doing that, I'm not sure what wire to use.  From what I've read it appears I need to use a 308 wire but do I try using a solid wire or flux cored wire and what size do I use?Thanks for the help.
Reply:Originally Posted by DavidbrownGas is pretty cheap, especially if you are considering having professionally welded. You are looking at 65-100 an hour for that, at about 3-8 hours depending how many joints/welds you are talking.  I think a small bottle of gas will be about $60, tops.  If you will take it to somebody, you should use .030, solid core wire.
Reply:Originally Posted by motolife313Jestang. Where are you located? Someone on this forum would most likely love to hook you up with a fair deal
Reply:Originally Posted by GambleYou can weld it with 75/25 and er70s wire. It just won't be stainless weld and it can/will rust. Or buy some 308L flux mig wire. Or if you have stick welder, get some supermissle rod and go to town.
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