Heat treatment
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What if two different welding methods are used for the welding of the cylinder body and the welding of the head? For example: the cylinder has a thickness of 54 mm, the welding method is SMAW, and the welding test plates undergo stress-relief heat treatment in the furnace. The head has a thickness of 62 mm, and the welding method used is SAW. The head is formed by warm pressing; it consists of segment halves and a cover, with the cover being assembled first and then welded. The deformation rate does not exceed 5%. Question: Is it necessary to carry out heat treatment to restore the properties of the head and cover? Are two welding test pieces required, one for the cylinder and one for the head?
If the deformation is within 5%, no heat treatment to restore performance is required; only post-weld heat treatment for both the cylinder body and the head is necessary. If product welding test plates are required, one should be made for each of the head and the cylinder body.