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I apply stl6 HFO with PTa on f6a material. After machining the weld surface, there is no problem. weld surface checked with UT and liquid penetrant method but after 3-4 days the all weld disbond from surface or seen big cracks. do you have any suggest.

Hello Dear Friends, I want to produce a flanged type API 5000 gate valve with 36K material. No any additional end connector top connector or auxalry part only gate valve. is this acceptable.