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Welding 304L to 321

Welding 304L to 321

Welding 304L to 321

(OP)
Welding 304L to 321 SS
 I had figured on using 347 welding rod to tig weld a tube spigot made of 304L to a 321 exhaust pipe. The tube is a condensate /rainwater drain.
 A colleague of mine said Inco 82 would do a better job because of the higher nickel content.
 I figure this is a situation where a little knowledge is dangerous. What are the pros and cons of using an inconel rod here?
B.E.

RE: Welding 304L to 321

Can you give a little more about your application, like what is the environment that the material will see?
In other words do you still need to corrosion resistance of SS?

RE: Welding 304L to 321

You should be able to use 308L or 309L rod.  Alloy 82 is harder to weld with than stainless-the weld puddle is like molasses, and is extremely susceptible to cracking if traces of lead or sulfur compounds are present.

RE: Welding 304L to 321

(OP)
unclesyd (Materials)
The exhaust pipe is on a seaplane that is used in salt water, however the major concern is getting rid of rainwater collecting in the exhaust pipe, when the aircraft is moored.
Metalguy (Materials)
I do have lead compounds present, residues from tetra ethyl lead.
Goahead (Aerospace)
I am familiar with Avesta products, I use their pickling paste.
 All,
  It is just as well I asked the question. I did not know about the cracking problems with 82 with lead in the picture. I will stick with my original choice 347.
 This is what makes this forum work, no nonsense answers.
B.E.

RE: Welding 304L to 321

I would propose that using the inconel filler metal could actually be detremental in this application.  Due to all the heating and cooling cycles, it would be better to use a stainless steel with a CTE that matches the base metal.  The nickel alloy has different CTE which would result in higher residual stresses and possibly fatigue cracking.

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