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Re: [MW:34592] Oxidation during welding of SA213 gr T22

By Materials & Welding
Please continue with the back purge. GTAW and GMAW require it.
Also, welding of T22 demand the major care,  cleaning and free oxidation.

Regards,
Ramon Briceno
Metallurgical Engineer.


From: materials-welding@googlegroups.com <materials-welding@googlegroups.com> on behalf of hvala...@gmail.com <hvalaalpesh@gmail.com>
Sent: Tuesday, October 3, 2023 3:33:15 AM
To: Materials & Welding <materials-welding@googlegroups.com>
Subject: [MW:34562] Oxidation during welding of SA213 gr T22
 
Dear experts,

We are facing problems with welding of SA 213 Gr T22 superheater tubes of thickness 2.9mm.

Generally, back purging with inert gas in GTAW is not necessary for P22 as Cr is less than 3%. However, during welding without use of back purging, Oxide formation is happening. The construction of the equipment is such that, purging is very difficult to achieve.

Kindly Guide us to eliminate the oxidation of root.

Thanking you,
Alpesh


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