How to weld exhaust
12-03-2004, 11:08 AM
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How to weld exhaust
I need to install a new wastegate and will be modifying the crossover pipe. Does anyone know which type of stainless steel wire is best for MIG welding?
12-03-2004, 01:48 PM
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The material in thewastegate pipe branch on the crossover pipe is Incoloy 800 or similar, the rest of the tubing is AISI 304 stainless.
Do you have access to a pulse MIG welding machine with pure AR shielding gas? You should never use gas containing CO2 when welding stainless. To weld stainless with a non pulse MIG will not give the best results.
I suggest you use a TIG welder for best results.
You should probably use some high nickel wire for welds against the branch piece. For the piping 304 should work well.
Tomas
Do you have access to a pulse MIG welding machine with pure AR shielding gas? You should never use gas containing CO2 when welding stainless. To weld stainless with a non pulse MIG will not give the best results.
I suggest you use a TIG welder for best results.
You should probably use some high nickel wire for welds against the branch piece. For the piping 304 should work well.
Tomas
12-03-2004, 02:41 PM
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What are you welding to the crossover? A flange? What material?
Typically on stainless, you'd want to use AISI 308L for its low-corrosion and low-carbon level to prevent carbide formation. If you're not sure of what material the flange is, use AISI 309L for joining dissimilar steels, like ferritic to austenitic stainless steel. If the flange isn't even stainless, use AISI 309.
Yeah, like Tomas said, no CO2 in the mix. You don't need the extra penetration anyway since you're looking at thing tubing.
Typically on stainless, you'd want to use AISI 308L for its low-corrosion and low-carbon level to prevent carbide formation. If you're not sure of what material the flange is, use AISI 309L for joining dissimilar steels, like ferritic to austenitic stainless steel. If the flange isn't even stainless, use AISI 309.
Yeah, like Tomas said, no CO2 in the mix. You don't need the extra penetration anyway since you're looking at thing tubing.
12-03-2004, 04:18 PM
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So bottom line... best to take it to a shop... that is what I did when repairing the headers... US$50.00 and the guy had all the correct equipment. Old, retired, airplane mechanic that has a shop near by.
I know you cannot have too many tools... but not ready to make the expense on a TIG welder...
I know you cannot have too many tools... but not ready to make the expense on a TIG welder...
12-03-2004, 05:03 PM
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12-03-2004, 05:08 PM
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Danno,
I am going to weld the wastegate inlet elbow to the crossover to eliminate the gasketed joint. With the excellent advise, I realize that I have to take it to a welder.
I am going to weld the wastegate inlet elbow to the crossover to eliminate the gasketed joint. With the excellent advise, I realize that I have to take it to a welder.
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12-03-2004, 06:06 PM
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I am going to weld the wastegate inlet elbow to the crossover to eliminate the gasketed joint. With the excellent advise, I realize that I have to take it to a welder.
What you can do before you take the parts to the welder is to grind or brush them clean. With these materials it's important to have clean metal surfaces when you start to weld.
Last edited by Tomas L; 12-03-2004 at 08:43 PM.
12-03-2004, 10:12 PM
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A few months ago, I had the 2000 degree ceramic coating applied to the headers, crossover and down-pipe so it would be nice to keep the crossover. I can leave the flanged connection but then I have to support the wastegate with a separate bracket. Doable but less convenient than holding the wastegate with it's flanges.
