Re: [MW:34222] SS GTAW Welding without Back purging.

There are some articles with  GMAW -RMD process on stainless steel without purging gas , even with GTAW by using flux coated wire and flux paste u can do welding without  without purging gas in place , but client acceptance to be taken by using qualified PQR'S in place before procedding for this and it takes time for approval.

in common SS to SS welds always required back purging .

there are some cases of CS# SS doesnot required any back puring during root welding. 

Thanks & regards, 

Srinivas Rao

welding Engineer 

On Monday, May 22, 2023 at 8:31:03 AM UTC+4 Kannayeram Gnanapandithan wrote:

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 <email2...@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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