Whether the weld between the head and the cylinder needs to undergo post-weld heat treatment?
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Design a compressed air storage tank. The material is Q3456R, the thickness of the head is 34mm, and the thickness of the cylinder is 32mm. After the two are butt-welded (without preheating before welding), is the circumferential seam required to undergo post-weld heat treatment?
No, this thickness can refer to the heat treatment standard: GB/T30583-2014 has a picture of butt weld thickness in the middle.
No, because the welding point between the head and the cylinder is thinned to 32mm.
If the heads are spliced, the heads themselves should undergo post-weld heat treatment. Is there any impact after the head and cylinder are welded?
This post was last posted by * AOL_1 Edited at 2017-11-8 16:43 1. If the heads are spliced, the heads themselves should undergo post-weld heat treatment. -----Heat treatment is not recommended. Take the method of preheating before welding. 2. The material is Q345R, the thickness of the head is 34mm, and the thickness of the cylinder is 32mm. According to GB150, it does not need to be thinned and can be directly welded. According to GB150 8.2.1 d), there is no need to perform post-weld heat treatment. However, in order to avoid the problem of post-weld head heat treatment before welding, it is recommended to preheat before welding. If the head does not undergo post-weld heat treatment, I personally think that pre-welding preheating is not necessary.
Since the heads are generally outsourced to pressure vessel manufacturers, if the heads are heat-treated, I personally think it is appropriate to perform post-weld heat treatment on the circumferential seam after the two are butt-welded (without preheating before welding).
According to GB150, it is not necessary to perform thinning treatment and can be directly welded. According to GB150 8.2.1 d), there is no need to perform post-weld heat treatment.