Regarding the thickness coverage for welding procedure qualification of partially penetrated structures
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I’m new to welding and would like to ask the experienced colleagues here: for the corner joint between the pipe and the flat cover, holes are drilled in the flat cover with a bevel of about three to four millimeters at the edge of those holes. The welding of the pipe and the flat cover is carried out using a plug-type double-sided partial penetration welding method. The thickness of the flat cover is 35 mm, while that of the pipe is 6 mm. In this case, does the thickness coverage required for welding procedure qualification need to include both the thickness of the flat cover and that of the pipe, or only the thickness of the pipe? (I don’t know why, I can’t send pictures.)
This is a fillet weld; it’s sufficient to have an evaluation of the fillet weld, otherwise a butt weld will do, and there’s no need to consider the thickness of the flat cover.
Any groove-cut welds must be evaluated in accordance with the rules for butt welds. For this workpiece, there are two scenarios: if impact resistance is not required, a weld evaluation using base metal with a thickness of 18 mm will suffice. For impact requirements, an 18 mm weld assessment is needed (covering the flat cover side) + a 6 mm weld assessment (covering the nozzle side) + an 8 mm weld assessment (covering the intermediate transition section)