Except for Reactive metals, others are optional, while qualifying PQR, u have to keep it in about referring codes requirements. As general engineering practice, if Cr is more than 3%, it is always better to have back purging to avoid oxidation.
THANKS & BEST REGARDS,
KG.PANDITHAN, BE, IWE, CSWIP 3.1,
ISO 9712 Level 2 in VT,
ASNT-Level II in PT,MT,RT & UT,
LA ISO 9001-2015,
International Welding Engineer.
CONSULTANT-WELDING & QUALITY
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On Mon, May 22, 2023 at 8:40 AM Anand Elankumaran <email2uranand@gmail.com> wrote:
Dear experts,--Could you please check and advise the below query.
- Whether the back purging is a quality requirement or the ASME code is insisting on back purging on SS material while doing the GTAW process.
- Whether we can qualify SS -GTAW PQR without back purging or the ASME code does not allow doing PQR for austenitic steels without a back purge?
- Kindly advise how to do it without purging in SS GTAW Welding . Planning for PQR as well
--Thanks and Regards,E. Anand,Lead QA-QC,Sohar,Oman.
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