Seeking advice on whether the welding procedure qualification covers this issue
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I currently have a 50+4 composite plate reactor that requires overall heat treatment after welding. I currently have a weld evaluation that is valid for thicknesses ≤200 mm and does not require heat treatment. Can this weld evaluation be applied to jobs of the 50+4 type that do require heat treatment? I found a sentence in 47014: Changing the post-weld heat treatment category requires re-performing the welding procedure qualification. As I understand it, since I didn’t perform heat treatment, the category of post-weld heat treatment also remained unchanged; does that mean it’s not necessary to carry out a new weld evaluation? I also couldn’t find any relevant evidence in the welding procedure qualification form, so I’m seeking advice; it would be best to have some supporting evidence. . .
In my personal opinion, they should be different; PQR is primarily used to verify the mechanical properties of test pieces manufactured using a certain welding process. Can the mechanical properties be the same whether heat treatment is applied or not?
The weld evaluation for welds that have undergone post-weld heat treatment is different from that for those that have not, and the former cannot replace the latter. Moreover, the poster mentioned that \"a weld evaluation is considered valid for thicknesses ≤200 without heat treatment\"; it’s unclear why heat treatment isn’t applied in this case A weld evaluation of this thickness definitely requires heat treatment!
Changing the heat treatment category requires re-evaluation. . So take a look at what’s available in the heat treatment categories. . . 47014 5.1.4
The weld evaluation for heat-treated welds and that for unheat-treated welds covers different ranges of weld thickness and base metal thickness.
Overall heat treatment is a distinct type of heat treatment; it is not the same as post-weld heat treatment. This means that the weld evaluation for the welded parts must meet the requirements of overall heat treatment. The weld evaluation specifies that the desired heat treatment state must be achieved. For example, many end caps require heat treatment, and therefore the weld evaluation for the joints between these end caps must ensure that the required heat treatment state is attained. A weld evaluation that takes heat treatment into account is necessary for this purpose. According to the requirements set by the Ministry of Chemical Industry, I recommend that you carry out heat treatment, so as to avoid any issues when submitting inspections