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Pre weld HT regarding welding 4130 onto Inconel 625.

Pre weld HT regarding welding 4130 onto Inconel 625.

Pre weld HT regarding welding 4130 onto Inconel 625.

(OP)
My guys intend to (Argon weld) 4130 onto Inconel-625, I know that post weld heat treatment isn't required but I need confirmation that pre weld HT isn't required for the 4130.
I don't think its required, am I wrong?

RE: Pre weld HT regarding welding 4130 onto Inconel 625.

noviceEng;
Preheat is required for 4130 base metal because this is an alloy steel that has increased hardenability over carbon steel. I would use the following;

350 deg F for thickness at or below 1".

400 deg F for thickness greater than 1".

RE: Pre weld HT regarding welding 4130 onto Inconel 625.

What are are going to use for filler metal?

RE: Pre weld HT regarding welding 4130 onto Inconel 625.

It had better be either Inco weld A or similar Ni-base filler metal. Also, watch your heat input.

RE: Pre weld HT regarding welding 4130 onto Inconel 625.

(OP)
Thanks for responding guys, I really appreciate it, I see I still have a lot to learn. I intended to use Nickel-Chromium-Molybdenum low iron bare welding wire as the filler. Any other advise?

RE: Pre weld HT regarding welding 4130 onto Inconel 625.

Do you have a qualified welding procedure? If not, I would seek assistance to qualify a welding procedure for your welders.

RE: Pre weld HT regarding welding 4130 onto Inconel 625.

(OP)
That's the interesting part of this whole scinario. I have a WPS for the 4130 and another for the inconel-625 but the Customer wants one procedure to cover both materials. Funny huh.

RE: Pre weld HT regarding welding 4130 onto Inconel 625.

No, it is not funny because your Customer is absolutely correct in requesting a specific weld procedure to join two dissimilar materials. This is routinely done in industry.

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