Welding and flaw detection of stainless steel composite plates
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Asking for help, sea friends: The welding method and sequence of stainless steel composite panels, and when to perform penetrant testing. Thanks!
After each layer is welded, let it cool down, and then do penetration. After that, polish it clean, then continue welding, and repeat the same steps until the welding is completed.
Welding sequence of stainless steel composite panels: Generally, the base layer is welded first, and then the cladding layer is welded. RT non-destructive testing can be arranged after the base layer is welded, or after the cladding layer is welded. For some composite steel plate materials that are prone to cracks, the base layer can be welded first, then RT, then the cladding layer, and then RT after the cladding layer is welded. PT is generally aimed at the cladding surface, so it is usually installed after the welding of the cladding surface is completed. For some special circumstances, the cladding layer can also be welded first and then the base layer. For example, for small-diameter barrel sections, argon arc welding can be used to weld the cladding layer first and then the base layer, but the welding electrode for the base layer must be a transition electrode.
My personal opinion is basically the same as LS. First weld the base layer for flaw detection (sometimes use RT if it is not convenient to see the film, so use UT). If there is no problem, then weld the cladding PT (if the base layer is UT, then RT+PT) (In order to ensure quality, I usually use base layer RT, then clad layer UT+PT or base layer UT, then clad layer RT+PT)