Oxidation during welding of SA213 gr T22

[hvala...@gmail.com]

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

[tamilneethi thennavan]

Dear Mr.Alpesh,

As your statement is wrong.as per API RP 582 Shielding and Purging Gases Clause 7.3 Back purging is required for the GTAW and GMAW processes for welding materials having a nominal chromium

content greater than 2-1/4 %, 

So you better try back purging....... 

Thanks.

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Regards,

Tamil Neethi.T

                 

[Vishwas Keskar]

For Gr 22 purging is not required

You can do following 

Use lower dis filler wire dia 1.6 

Use injection purging. Method means : inject. Gas from groove root gap

This shall ensure better quality of Welding 

Vishwas -IWE

International Welding Engineer

Sent from my iPhone

On 06-Oct-2023, at 2:22 PM, tamilneethi thennavan <tamilne...@gmail.com> wrote:



Dear Mr.Alpesh,

As your statement is wrong.as per API RP 582 Shielding and Purging Gases Clause 7.3 Back purging is required for the GTAW and GMAW processes for welding materials having a nominal chromium

content greater than 2-1/4 %, 

To view this discussion on the web visit https://groups.google.com/d/msgid/materials-welding/CAM2rNBwHskCdax%3D7nfg6wfDJeOrDWBzgaN_pmec9t_12UNWE6w%40mail.gmail.com.

[Kannayeram Gnanapandithan]

what is nominal Cr% inP/T22

To view this discussion on the web visit https://groups.google.com/d/msgid/materials-welding/CAM2rNBwHskCdax%3D7nfg6wfDJeOrDWBzgaN_pmec9t_12UNWE6w%40mail.gmail.com.

[Prakash Hegde]

Hi

My experience with LAS welding by GTAW

Filler wire with above 1.4 Cr say EB2

It is better to use Argon purging for FPW for GTAW to avoid Oxidation of weld for root

Regards

Hegde

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https://groups.google.com/d/msgid/materials-welding/68468F91-0FFE-4FAC-8207-EC3034CB5204%40gmail.com

.

[Vishwas Keskar]

P22/T22 is 

2.25 Cr , 1 Mo 

Sent from my iPhone

On 09-Oct-2023, at 12:24 PM, 'Prakash Hegde' via Materials & Welding <material...@googlegroups.com> wrote:

Hi

To view this discussion on the web visit https://groups.google.com/d/msgid/materials-welding/907605682.7480634.1696596347159%40mail.yahoo.com.

[Kalpesh Mehta]

Dear all,

Can anyone share underwater training material and WPS /PQR ? 

Regards 

[Ramon Briceno]

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.

Obtener Outlook para Android

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