Monday, May 22, 2023

Re: [MW:34219] SS GTAW Welding without Back purging.

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
Mobile no: +919940739349


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 


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Thanks and Regards,
E. Anand,
Lead QA-QC,
Sohar,
Oman.

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