Welding procedure qualification
Thread Content
There is a forged pipe with a thickness of 40 mm; one side of it has been machined to 10 mm thick and then joined to a WN flange. When conducting a process evaluation for this joint, is it sufficient to have a process evaluation that covers only the 10 mm thickness, or is it necessary to have one that covers both 10 mm and 40 mm?
Only a 10mm evaluation coverage is required
An assessment covering 10 mm is sufficient
The issue here isn’t related to the evaluation of welding processes; rather, it’s your lack of understanding regarding welded joints. The thickness of a welded joint is determined by the total thickness of the weld itself, not by the original thickness of the pipe material (as in the case of welded joints with unequal thicknesses)； For joints formed by combining multiple welding methods, it is necessary to consider the coverage range of each welding process evaluation.
The thickness of the base metal and the weld metal – an assessment covering 10 mm is sufficient