Inco 625 overlay on pipe(wall thickness 25.4 mm)
Inco 625 overlay on pipe(wall thickness 25.4 mm)
(OP)
Hi Gents,
I have a question regarding Inconel 625 weld overlay(3mm) inside pipe (wall thickness 25.4 mm). Please tell me with code refernce "if stress relief after weld overlay is required or not".
Construction code: ASME B31.3 and welding as per ASME IX.
Regards
I have a question regarding Inconel 625 weld overlay(3mm) inside pipe (wall thickness 25.4 mm). Please tell me with code refernce "if stress relief after weld overlay is required or not".
Construction code: ASME B31.3 and welding as per ASME IX.
Regards





RE: Inco 625 overlay on pipe(wall thickness 25.4 mm)
= = = = = = = = = = = = = = = = = = = =
Plymouth Tube
RE: Inco 625 overlay on pipe(wall thickness 25.4 mm)
RE: Inco 625 overlay on pipe(wall thickness 25.4 mm)
RE: Inco 625 overlay on pipe(wall thickness 25.4 mm)
I can't interpret. Please elaborate.
"Base on the code, PWHT is required for P no. 1 material when wall thickness more than 19mm". In this case why it is not applicable?
Regards
RE: Inco 625 overlay on pipe(wall thickness 25.4 mm)
Check for any interpretations issued by B31.3 regarding the application of CRO's and exemption to PWHT.
RE: Inco 625 overlay on pipe(wall thickness 25.4 mm)
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
RE: Inco 625 overlay on pipe(wall thickness 25.4 mm)
RE: Inco 625 overlay on pipe(wall thickness 25.4 mm)
As has been pointed out, the butt welds will be subject to PWHT which may affect the corrosion resistance of the 625 and, if you are the end user, you may wish to consider some form of supplementary testing of the heat treated material to confirm acceptable properties.
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
RE: Inco 625 overlay on pipe(wall thickness 25.4 mm)
B31.3 clad welding 323.4.3 refers you to BPV UCL-34 PWHT. BPV first starts off with a 'CAUTION' about possibly affecting the corrosion properties via heat treatment, then goes onto to say that yes, heat treatment shall be done per the base metal thickness.