Welding of dissimilar steels in pipelines
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Issues regarding weld qualification for dissimilar metal welding in pipelines: For example, do the weld qualifications that are approved for Fe-8-1 and Fe-4-1 cover all steel grades within these categories? If weld qualifications are obtained for stainless steel 316 and 15CrMo, are they applicable to welding other stainless steels of type 8-1 with 15CrMo? Also, does the weld joint of the 15CrMoG 219*12 pipe require heat treatment? I hope everyone will let me know
It is said that dissimilar steels cannot be welded directly, which leads to contact corrosion； Then 15CrMoG requires post-weld heat treatment~
The weld evaluation for the poster’s stainless steel 316 and 15CrMo was successful. Could you let me know how this was achieved? Is it 15CrMo cladding, heat-treated, and then welded to 316? What is the grade of the welding rod or wire?
This post was last edited by niat8888 on 2016-1-14 at 18:39; it should be welded using A302 (E309). . At most, for a bit more luxury, use nickel-based welding rods. .
Well, doesn’t welding different types of steel also depend on the environment? Chromomolybdenum alloy steel requires post-weld heat treatment, and this is how we proceed.
Well, what I meant was hypothetically; I was actually trying to find out whether the weld evaluation for welding F-8-1 and F-4-1 types of dissimilar steels covers the welding of these two types of steel together