Issues related to the weld qualification process for plug-in stainless steel nozzles and composite plate shells
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Seeking help: The thickness of the austenitic stainless steel nozzle is 6 mm, while the thickness of the composite plate cylinder is 20+3 mm. How should the welding procedure be evaluated for the welds of this plug-in nozzle?
Get an evaluation form; each part should be covered. . . For example, use a 12+3 board for connection. . . In this way, stainless steel covers 1.5–6, while carbon steel covers 12–24. . Use different welding materials for different purposes; use a transition welding material for the transition layer. .
I think two evaluations are needed: one for the butt joint of the composite plate, and another for surfacing welding. For example, you can choose ① Evaluation of 20+3 butt joint, or ② Surfacing welding on the base layer (using a transition layer weld rod for the first layer and a stainless steel weld rod for the second layer?) ) Also, for welders working on the transition layer, surfacing work is required