Let’s test everyone: Is overall heat treatment in the furnace carried out before non-destructive testing or after it?
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Let’s test everyone: Is overall heat treatment in the furnace carried out before non-destructive testing or after it?
This post was last edited by fzujunru on 2019-7-22 at 22:11. I. After the non-destructive testing of the welds that must be inspected is successful, any defective welds must be repaired and retested until they pass as well; only then can overall heat treatment be carried out； II. For materials prone to reheat cracking, non-destructive testing is also required after heat treatment ； III. For reactors such as hydrogenation reactors, non-destructive testing is carried out after the hydrostatic test. So, in general, NDT is performed before heat treatment, and in some cases it is also carried out after heat treatment.
It should be done before heat treatment in most cases, depending on the specific circumstances; in special cases, it is carried out after heat treatment
Post-weld heat treatment can only be carried out after all welding work on the pressure vessel has been completed and passed inspection. This is the requirement of clause 4.2.6.2 in TSG 21-2016.
Heat treatment before non-destructive testing!
That’s the thing; if you don’t come into contact with it often, you simply can’t remember it! Heat treatment can only be carried out after non-destructive testing is successful.
Are you sure? How can it be ensured that all welds are qualified without conducting non-destructive testing?
Whole-furnace heat treatment is similar to on-site heat treatment of welds; the only difference is that whole-furnace heat treatment yields better results. In both cases, NDT is performed after welding, followed by heat treatment.
Non-destructive testing must be carried out before heat treatment, and it is also necessary for special materials and special equipment after heat treatment
Non-destructive testing should be carried out first, before heat treatment