For heat exchangers and tube sheets, the expansion-then-welding process is used; does the non-expanded portion expand to the root of the groove?
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Clause 6.6.3.4 of GB/T151 states that \"when the manufacturing process of expanding first and then welding is used, the areas that are not expanded in Figures 6-20 and 6-21 should also be expanded to the root of the groove.\" I would like to ask everyone: if expansion is carried out first and then seal welding, is it necessary to follow this requirement, that is, to expand the 15mm area that does not undergo expansion as well all the way to the root of the groove?
Generally, it involves strength expansion plus seal welding; I wonder if bonding expansion plus seal welding can ensure the required strength. If there is no swelling at 15, gas will accumulate during welding, leading to the formation of pores; it should be expanded to the root portion in accordance with the standards