Preheating and penetration issues in chromium-molybdenum steel welding
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In the desulfurization and denitration project, there is some material made of 15 chromium molybdenum. According to standard 3501, grooves are required, and penetration testing as well as pre-heating before welding are necessary; however, standard 3501 is not applicable to this project. I would like to ask whether penetration testing is still required.
Performing penetration testing helps to eliminate defects that occur during bevel processing. . . Preheating – it depends on your WPS. . . . Not all CrMOs need to be preheated. .
Performing penetration testing helps to eliminate defects that occur during bevel processing. Preheating – it depends on your WPS. . . . Not all CrMOs need to be preheated.
This post was last edited by Muziyu on 2017-9-13 at 13:35. Yes, penetration testing is carried out to detect defects on the surface and near the surface of the groove. It’s not mandatory, but it’s better to do it. As for preheating. According to the procedures, if you have a welding process, it must be followed; Cr Mo steel generally requires preheating as it has a high tendency to harden