How is the thickness for post-weld heat treatment determined?
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How is the thickness of the post-weld heat treatment for welding forged pipes to pressure vessel shells determined? GB/T30583-2014 only addresses welded pipes and does not cover forged pipes. As shown in the figure below, it is a forged pipe for manholes; with a cylinder thickness of 16 mm, how can the heat treatment thickness be determined? Should the thickness of the forged pipe neck, the thickness of the cylinder body, and the thickness of the fillet weld be the largest among them? Solve! !
How about taking a look at Chapter 8.4 of GB/T150.4-2024?
This post was last edited by zjq1962 on 2025-3-24 09:42. Should the pipe and the cylinder be connected using an insertion method or a mounting method? If it is of the inserted type, the heat treatment thickness is the thickness of the cylinder; if it is of the seated type, the heat treatment thickness is the thickness of the forged pipe neck.
When determining the post-weld heat treatment thickness for the welding of forged pipes to the shell of pressure vessels, relevant standards and specifications should be referred to. Although the GB/T30583-2014 standard primarily addresses fittings and does not specify details regarding forged pipes, in general, it can be determined using the following method: 1. The heat treatment thickness of the weld area usually depends on the maximum thickness of the weld. This includes the thickness of the forged pipe neck, the thickness of the cylinder body, and the thickness of the fillet welds. 2. In this case, the maximum value among the thickness of the forged pipe neck, the thickness of the cylinder body, and the thickness of the fillet weld should be selected as the heat treatment thickness. Therefore, if there are different thicknesses among the pipe neck thickness, the cylinder wall thickness, and the fillet weld thickness, you should select the maximum value among these three as the thickness for post-weld heat treatment. If more detailed provisions are specified in the standards and the specific requirements of the engineering project, follow those provisions. If you still have doubts, it is recommended to consult engineers in the relevant field or contact the standard-setting organization directly for more specific guidance. .
Shell thickness 16, manway forged pipe thickness 24? Against common sense
This post was last edited by tcdlb on 2025-3-27 07:41. Pipe forging is also a form of pipe fitting; it should be considered based on a pipe fitting neck thickness of 1.6