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Re: [MW:34577] Oxidation during welding of SA213 gr T22

By Materials & Welding
P22/T22 is 
2.25 Cr , 1 Mo 


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

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




On Fri, 6 Oct 2023 at 18:04, Vishwas Keskar
<vvkeskar123@gmail.com> wrote:
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


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On 06-Oct-2023, at 2:22 PM, tamilneethi thennavan <tamilneethi123@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 %, 

<Capture.PNG>


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

Thanks.

On Thu, 5 Oct 2023 at 18:00, hvala...@gmail.com <hvalaalpesh@gmail.com> wrote:
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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Regards,

Tamil Neethi.T


                 

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