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daemonoid
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PostPosted: 11:15 - 04 May 2014    Post subject: Welding... Reply with quote
I did a bit of welding about 15 years ago, and was reasonably ok at it, but it was always repairs of gates etc.

Now, I've borrowed an arc welder and need to weld some stainless to a mild steel joist. Anything I need to think about?
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CaNsA
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PostPosted: 11:54 - 04 May 2014    Post subject: Reply with quote
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gavcarter
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PostPosted: 12:21 - 04 May 2014    Post subject: Reply with quote
very tricky, will probably need to opt for stainless welding rods which are expensive compared to normal ones.
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Chinaboy
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PostPosted: 15:29 - 04 May 2014    Post subject: Reply with quote
Welding dis-similar metals is fine if you have to correct rods/electrodes. 309 rods would be best. Look here: https://www.weldingwire.com/applications/DocumentLibraryManager/upload/309.pdf
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kestrel
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PostPosted: 19:35 - 04 May 2014    Post subject: Reply with quote
Without knowing the grade of stainless the best rod choice would be 309L or 309LSi.
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Rogerborg
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PostPosted: 20:08 - 04 May 2014    Post subject: Re: Welding... Reply with quote
daemonoid wrote:
joist

Probably not something I'd bet on an Intardtubes Sez solution.
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daemonoid
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PostPosted: 20:40 - 04 May 2014    Post subject: Re: Welding... Reply with quote
Rogerborg wrote:
Probably not something I'd bet on an Intardtubes Sez solution.


Don't worry... Welding a small bit of stainless to an exposed joist. It's fine... Praying
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daemonoid
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PostPosted: 20:41 - 04 May 2014    Post subject: Reply with quote
kestrel wrote:
Without knowing the grade of stainless the best rod choice would be 309L or 309LSi.


No chance of knowing... It's reclaimed...
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kestrel
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PostPosted: 21:02 - 04 May 2014    Post subject: Reply with quote
daemonoid wrote:
kestrel wrote:
Without knowing the grade of stainless the best rod choice would be 309L or 309LSi.


No chance of knowing... It's reclaimed...


Personally I'd use 309L, we use them at work whenever we have to join stainless to carbon steel. Does the job actually require welding or could you do it with some type of stainless fasteners? The reason I ask is that the welded joint *will* discolour badly in the heat affected zone over time, unless treated with a pickling agent after welding.
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