What are the specifications for the range of pipe diameters covered by the welding procedure qualification for pipes?
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For example, can the weld procedure qualification for 42*3.5 cover pipes of 18*3? ? Please give me your advice
The welding procedure qualification for pipes generally needs to be determined based on factors such as the pipe material, thickness, and diameter. For the welding procedure qualification of 42*3.5, it is generally not possible to directly apply it to the welding of 18*3 pipes, as the diameters and wall thicknesses of the two are different; accordingly, separate welding procedures need to be evaluated to ensure welding quality. For specific details, refer to the relevant standards, specifications, and technical requirements. .
If the base material and welding material have the same specifications and there are no special requirements, covering is acceptable
The smaller one can cover the larger one, with a wall thickness twice that of the latter.
No, those with a diameter of less than one inch need to be evaluated separately