How to verify that pipeline heat treatment meets specification requirements
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In the chemical manufacturing process, certain materials are prone to stress corrosion in specific medium environments. There are two solutions: 1. Perform post-weld heat treatment on the welds； 2. Change the material. So a question arises: for post-weld heat treatment, how can we determine that it has been carried out properly and is of satisfactory quality? How can we know by checking which data?
What is the name of the device? ? Is a specialized unit needed for inspection? What data needs to be measured? Hardness, or something else? . . . .
Are there any specific standards regarding the numerical value of hardness? I’ve checked many standards, but none provide detailed information on this.
“Could you explain “pressure testing and flaw detection” in detail? Thank you very much
Generally, such materials are initially tested by creating welding specimens; otherwise, why conduct destructive analysis once the welding is already complete? ? In the initial stage, weldment analysis is carried out to determine the welding process, after which welding is performed strictly in accordance with that process. Later on, spectral analysis can be used to assess the degree of element loss, or Mohs hardness analysis can be conducted; these are all auxiliary methods. It is not possible to see the actual microstructure without using a microscope