Forging inspection--Non-destructive testing
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This post was last edited by gn_1984 on February 22, 2016, at 10:18. For forgings rated at 1500 LB, according to the ASME material standard A105, there seem to be no non-destructive testing requirements. Then why do purchasers generally require non-destructive testing for such forgings? The inspection methods are generally UT, MT, PT ； When is RT needed? What inspection and acceptance standards are to be followed? Inspect per ASME V, accept per JB 4730 ； Do foreign customers approve of it? How to choose the acceptance level? @gjyzb @angelz10 @Sammy_Wang
@gn_1984, I don’t understand.
Forgings are vulnerable to delamination defects, especially those that are subject to bending stresses, such as flat covers, flanges, and tube sheets. UT is definitely used the most, as it has the highest sensitivity for detecting such defects. Together with surface inspection, that should be sufficient. I’ve never seen RT, and I really don’t need it either. As for the acceptance criteria, they should still be in accordance with the requirements specified in various standards. If the specifications do not require it, follow the drawings. Generally speaking, for equipment that is highly toxic or poisonous, operates under high pressure or low temperatures, or is made of high-strength steel/CrMo steel, it is safer to use such equipment. Additionally, if the thickness of the forging is large and there is concern about uneven heat treatment, it may also be necessary to carry out UT testing, as well as internal sampling for impact tests and grain size analysis. Anyway, in general, when it comes to designing pressure vessels, I think it’s better to be cautious.
For example, how are values such as 1500LB and 2500LB determined, and what are the acceptance criteria? ASME products
I think all of the major issues faced by this technician fall under the broader category of general problems. . Fishing-related categories. You first need to place the problem within certain conditions. Talk about specific issues. For example, regarding forgings, what standards do those forgings need to meet? Is non-destructive testing required? Any requirements for non-destructive testing will be reflected in the standards. The standards include mandatory inspections and protocol-based inspections. . What are the testing methods? There are also qualification standards, as well as procedures to follow in case of non-compliance. . If not, resolve it through negotiation. If there’s nothing, the buyer decides for themselves. . How to determine it? Copy! Copying from here and there.