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Old 06-03-2009, 03:40 AM   #1
Benihana
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Default Welding Stainless without gas

Can I weld stainless steel to mile steel without using any gas? I have a Lincoln Weldpak 100hd. Would stainless wire suffice alone?

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Old 06-03-2009, 03:43 AM   #2
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you could stick weld it, but don't try to use a MIG without the gas...

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Old 06-03-2009, 03:44 AM   #3
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Technically, you can stick stainless and mild steel together with a pretty universal alloy like 308 without gas (as long as you use flux or flux-cored filler). However, the results aren't likely to be pretty. What is the application?

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Old 06-03-2009, 03:51 AM   #4
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Well it's not for anything brew related, I just thought since you guys are knowledgeable about welding that you would know. I'm trying to add a 2nd bung hole(stainless or mild) on a Stainless downpipe for my car, but I only have a flux lincoln mig with no gas....

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Old 06-03-2009, 03:56 AM   #5
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I highly recommend getting a muffler shop to do the work. You'll be much happier in the end.

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Old 06-03-2009, 03:58 AM   #6
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Yeah I think I might as well, thanks for the info.

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Old 06-03-2009, 06:58 AM   #7
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Quote:
Originally Posted by Benihana View Post
Well it's not for anything brew related, I just thought since you guys are knowledgeable about welding that you would know. I'm trying to add a 2nd bung hole(stainless or mild) on a Stainless downpipe for my car, but I only have a flux lincoln mig with no gas....
You need it to seal weld so it doesn't leak. Someone else suggested a muffler shop, but my experience with them has been spotty. They usually just have a MIG setup and only know how to weld upside down, with their eyes shut, on 14/16 gauge exhaust tubing.

My suggestion is find someone you know that has a TIG setup and knows how to weld. Or, look for "fabrication" or "welding" shops in your area that do welding. With the downpipe in your hand, it will be easy--I'm not sure if you planned on removing it or getting the welding done on the car. It should cost you that much as it is a pretty quick job. I could do it in 15-mins start to finish.

One last thing. I welded my own bung in my downpipe. First one didn't go well. You really should have an old O2 sensor or a plug installed in the bung when you weld it. Put on some good, N5000 high temp antiseize. My first one, I got so hot it didn't stay round. After getting it all nice and welded in, cooled down, I could'nt get my wideband installed. Had to cut it off and start over.
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Old 06-03-2009, 07:31 AM   #8
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Ok, when I said muffler shop, I didn't mean your local 2-bit garage. You need to have a GOOD shop deal with this job. Stainless exhaust work is not for the rank amateur.

turbo, with all due respect, you have no idea what you're talking about when it comes to welding an O2 sensor bung. You overheated the fitting and warped it. There is absolutely no need to have a sensor installed during the welding process, and you're likely to ruin the sensor if you do install one.

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Old 06-03-2009, 01:11 PM   #9
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I believe turbo's advice was to use an "old" previously ruined sensor.

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Old 06-03-2009, 06:53 PM   #10
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Just make sure you use only 308 stick electrodes, because 309,316, etc.. will cause cracking either right after its welded, or a short time after your part goes into service. 308 prevents this cracking, and is the only type stainless steel filler I will use to join mild steel to stainless steel. Now with that said, pipe is another animal all together, and Im not sure what a bung hole is, besides what I think it is, but if your welding on pipe, go to someone that knows what their doing, which others have said.

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