Questions regarding Article 52 of the Code of Practice
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In accordance with Article 52 of the Code, after verifying the strength of the fillet welds, the designer shall include the results of such strength checks in the design technical documents. Question: 1. Who handled this, and how was it included? 2. How is the strength of fillet welds verified? If there is a calculation sheet for verification, please send one.
It seems that no verification was carried out; instead, the area of the welds was taken into account during the calculations for reinforcement through openings. That’s why the diagram specifies a requirement for the height of the weld corners.
Looking forward to an answer; I’ll push for it myself!
Generally, no strength calculations are carried out. In my opinion: First, welding between the pressure-bearing components of pressure vessels must ensure full penetration. Second, the quality of the welds is crucial for maintaining strength; therefore, there are specific requirements for inspecting fillet welds. These are the key factors that ensure the strength of fillet welds
Generally, strength calculations are not required; for details, see the explanation in Article 52 of the Code.
See the explanations of the provisions in the \"Regulations on Safety Supervision of Pressure Vessels\" (1999 edition). Article 52: The content of this article is the same as that in the original Code. When revising the Code, consideration was given to requiring a strength check for certain fillet welds. Due to the continuous problems with fillet welds in recent years, however, during the consultation process, it was felt that such a regulation was not appropriate. There are two reasons for this: First, in China’s pressure vessel standard system, the strength of fillet welds is ensured by the structural dimensions at those welds; as long as the design follows the specified requirements, the appropriate weld quality is maintained during manufacturing, and the required weld root depth is achieved, then the strength of most fillet welds will not be a problem. Secondly, there are indeed fillet welds that require strength verification at present, but no mature calculation formulas exist in China, nor is there any experience regarding which loads should be taken into account; therefore, it is not yet the right time to establish a unified verification method under these circumstances. We took everyone's suggestions into account and handled it in this way ； It is not required that the designer perform checks on the fillet welds, but if the designer deems such checks necessary, the method of verification and the allowable load should be specified in the design documents.
When working on this area, we use HG20580~20585-1998 as a reference
It is first impossible to calculate the strength of fillet welds, and secondly, it is not possible to measure their strength. Testing agencies may sometimes provide test results, but in most cases these results do not correspond to the actual strength of the welds. The choice of testing angle has a significant impact on the test results; therefore, testing agencies generally do not conduct strength tests on fillet welds.