The tank body is made of Q245R+0Cr13Al composite steel; cracks have now appeared in the circumferential weld of the head – how should this be repaired?
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The tank body is made of Q245R+0Cr13Al composite steel; cracks have now appeared in the circumferential weld of the head. How should these cracks be repaired? Everyone is welcome to discuss this – including what type of welding electrodes to use and what welding procedure qualification reports are necessary. . @boyirensheng @rgsmdqy @yuchenchf @zhangqi1234 @zlky2005 @cleaner @YiNuoZhang @ToExpressGratitude @lovestory 【XiaoJie】Poetic Lyrical Version
Using A302 welding rod should meet the requirements. 0Cr13Al has low toughness, while the weld produced with A302 has a composition similar to that of austenitic stainless steel, offering better toughness; this helps to reduce stress at the weld site and prevent cracks from forming.
1: Drill crack stop holes. 2: Analyze the causes of the problem—welding stress, residual stress—and take measures to eliminate them. 3: Determine whether repair welding is possible; if so, develop a welding procedure—including the type of welding material, welding method, and protective measures. . . . . 4: Crack opening and welding 5: Inspection, such as coloring and flaw detection
This requires specific analysis; in some cases, there are seams on the head, and when welding the circumferential welds, it is possible for the base electrode weld to adhere to the layer over the head seams, resulting in local cracks. If cracks appear along the entire weld, that is not the case; in such situations, attention should be paid to the welding materials and welding parameters. During repair, corrosion is used to locate the interface of the cladding layer, and welding materials are used correctly.
I have seen composite plate welding once, but I didn’t pay attention to what specific type of composite plate it was. It’s best to contact the manufacturer’s technical staff for consultation.
Are there detailed official guidelines for using magnetic particle testing to inspect welds made of Q245R+0Cr13Al and 15CrMo+410S? .
Preheating before welding and post-weld heat treatment are crucial.