Classification of spliced tube sheet welds!
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Pipe sheet splicing is permitted in GB151, with certain requirements specified, but which category among A, B, C, or D does this weld fall into according to GB150? I hope everyone shares their opinions!
It is indeed not classified in GB150; based on the seam of the head, it is classified as Category A. From the perspective of tube sheet stress, I personally believe that classifying it as Category A is more appropriate.
It feels similar to the seal joint, so it is considered to be of Class A
It should be classified as a Class A weld. And in accordance with the requirements of clause 6.4 of GB151, 100% non-destructive testing is required; in addition to stainless steel, the materials shall also undergo stress-relief heat treatment.
In my opinion, it is also incorrect to classify this weld as category A according to GB150 for head joints, because the tube sheet is considered in terms of heads; at most it can be regarded as a flat head, whereas GB150 explicitly specifies “convex heads”!
Based on the stress conditions and non-destructive testing requirements, I personally believe it should be classified as Category A
GB150 states that all butt welds in all convex end closures are classified as Class A welds.