Welding Stainless

I was in the scrapyard yesterday and found some Oxygen Concentrators.
They have this nice stainless tank and fittings, tubing, etc. I know I
could find some use for it. Only problem is I know not alot about
welding, and even less about welding stainless. I have OA, AC/DC
Lincoln, and a POS Century WireFeed w/ Mig(but it really is a POS).
With what I have could I weld or braze stainless? I was hoping maybe
there is a stainless rod or something for the AC/DC. The Century
wirefeed has (I think) D2 wire (lifetime size giant roll I was given)
and 70/30 argon mix. I really dont want to invest any money into that
though, if that combo wont work. Any suggestions?
(ps- I love this group, I get answers to questions I didnt even know
to ask)
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Brazing or silver brazing is not a problem, you just have to use a good flux and is probably the cheapest way to go. I've done a lot of silver brazing with stainless and an air-acetylene torch. If you don't need the strength of a weld, it's probably a good way to go. Other posters will probably have welding recommendations.
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You can buy stainless steel wire for the MIG and use it with the 70/30 gas mix. The welds will have a gray oxide coating but that can be sanded off.
Stainless steel stick electrode works fine, but is difficult to use is any position other than flat.
You can oxy/acet weld stainless using a carburizing flame, but you will get massive distortion and oxide buildup.
Reply to
Ernie Leimkuhler
Ernie..I just brought home a dozen or so mostly full 30lb spools of various mig wire, a number of them being E309, E307 and so forth.
Ive a 200 amp Dan-mig machine. What is the maximum size I should be able to run of regular wire and stainless? About half of it is .045 dia. I know I cant run the aluminum stuff, without a liner and all that stuff, but.....? I have a nice shiney new tip for the mig gun for .045 with the wire....
My gas will be, for now, C25
There is also a full new 12" spool of .045 E71-T-1 wire. Is this flux core? Its a very dark color. Made by Hobart. Will my machine run this? A quick check on the net shows this as gas shielded flux core....????? Do I use gas with it, even if its flux core?
I weld outdoors and during the windy season..not having to worry about the gas blowing around would be nice.
Ive cultivated a welding machine repair shop owner, and he gave me all the spools of wire he has been saving from machines that are no longer fixable and were trashed..so I got some wire...
"To be civilized is to restrain the ability to commit mayhem. To be incapable of committing mayhem is not the mark of the civilized, merely the domesticated." - Trefor Thomas
Reply to
Industrially, this is usually done with a Tungsten Inert Gas (TIG) welder. This strikes an arc from a tungsten electrode to the work. Argon gas flows around the outside of the electrode and drives away oxygen from the weld, Filler wire is applied to the molten pool in a similar way to oxy/acetylene welding. There is almost no oxidation if the job is done by a skilled tradesman. Distortion is minimal, as the heat is concentrated in the weld area.Almost all of the pipe welding in the food industry is done this way. In pipe welding , argon is flooded into the pipe to prevent oxidation on the inside.
Reply to
Tom Miller
Long time ago I worked for Hobart (food equipment, not the other brother). Everything stainless that needed welding (1/4-20 studs on the backs of slicer guards come to mind) had to go out to a machine shop to be TIG welded. It was very expensive, back then anyways. That experience is probably why I didnt think I could weld stainless with what I have.
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You may be able to use the DC welder if you can get a handpiece and gas supply for it. You might check with the manufacturer.
Reply to
Tom Miller

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