Selection of weld evaluation methods for inserting composite plates into stainless steel forged pipes and selection of welder assessment items

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This post was last edited by megaherz_IGGE on 2023-1-3 09:06. Dear teachers, for the Type D joints in which stainless steel forged pipes are inserted into composite plates, as currently practiced, an evaluation method that combines assessment of the base material joint with assessment of corrosion-resistant surfacing is used. There is some confusion regarding the form of assessment for the surfacing: in Figure 1, the layer that serves as the base for the Type D joint is the A302 weld metal formed between different steel types. When using surfacing assessment to evaluate the transition layer and the coating layer in such joints, the base material for the assessment test pieces is usually Q345R, which does not correspond to the A302 weld metal that actually acts as the base layer in the product. How should this situation be handled when using surfacing assessment to cover the base material type? Similarly, in projects that involve surfacing welding, how is the base material of the welder’s test plates used to cover the dissimilar steel joints in the base layer? May I ask whether, whether for evaluation or for the selection of welder candidates, it is necessary to use a test plate structure similar to that in Figure 2 – one in which dissimilar steel plates are welded together and then stainless steel is clad on top?