Dissimilar Joint between P22(2.25Cr-1Mo) to P91( 9Cr-1Mo-V)

[RUSHABH PANJABI]

Hello,For dissimilar welding between P22 to P91, i have used Inconel  182 electrode.is it correct electrode.I have also tried buttering of inconel 182 on P22 and P91 and balance welding with B9 and B3.Then PWHT at 740 for 3  hours.. With buttering Side bend specimen fails adjecent to buttering in weld.. what can be reason for it?

[pgoswami]

Hi Rusabh,

 

There's something wrong in the selection procedure of welding electrodes. What you mentioned, i.e. use of Inconel welding electrodes applies for DMW between Grade-91 and Austenitic S.S. 

 

If you buttering with Inconel-182, thereafter welding with B9 and B3 welding electrode, it'll create nothing but complex welding metallurgy. NOTE ONE SHOULD NOT WELD ON AUSTENITIC ALLOYS, WITH FERRITIC ELECTRODES. Just check the composition from the basic rules of dilutions. The reverse (using austenitic electrode on ferric steel) will  work.

 

This welding could be easily done by using B3 or B9 welding electrodes , and  butt welding P22 to P-91 steel.

 

Thanks

 

 

Pradip Goswami, P.Eng,IWE

Welding & Metallurgical Engineer/Specialist

Ontario, Canada

pgos...@quickclic.net

pradip....@gmail.com

 

---

From: material...@googlegroups.com [mailto:material...@googlegroups.com] On Behalf Of RUSHABH PANJABI
Sent: Sunday, May 10, 2015 10:24 AM
To: material...@googlegroups.com
Subject: [MW:23260] Dissimilar Joint between P22(2.25Cr-1Mo) to P91( 9Cr-1Mo-V)

Hello,For dissimilar welding between P22 to P91, i have used Inconel  182 electrode.is it correct electrode.I have also tried buttering of inconel 182 on P22 and P91 and balance welding with B9 and B3.Then PWHT at 740 for 3  hours.. With buttering Side bend specimen fails adjecent to buttering in weld.. what can be reason for it?

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[Zeghanu Gigi]

Dear Goswami,

As per your last message" If you buttering with Inconel-182, thereafter welding with B9 and B3 welding electrode, it'll create nothing but complex welding
metallurgy. NOTE ONE SHOULD NOT WELD ON AUSTENITIC ALLOYS, WITH FERRITIC ELECTRODES. Just check the composition from the basic rules of dilutions The reverse (using austenitic electrode on ferric steel)will work."

Are you so kind to be give us more details regarding " compex welding mettalurgy "created if buttering with Inconel 182 is followed by welding with B9 and B3 welding electrode.

Regards

GIGI ZEGHEANU

Welding Engineer

--------------------------------------------
On Mon, 11/5/15, pgoswami <pgos...@quickclic.net> wrote:

Subject: [MW:23261] RE: 23260] Dissimilar Joint between P22(2.25Cr-1Mo) to P91( 9Cr-1Mo-V)
To: material...@googlegroups.com
Cc: rushabh...@gmail.com
Date: Monday, 11 May, 2015, 3:36

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[Chirag Sandhane]

Hi rushabh,

There is no need of buttering with inconel182. U can use directly B3 for welding of this combination. If u refer PW 39 of section I, u can see notes given below in that table for this combination with B3 electrode min PWHT temp is 705.

[george....@gr.bureauveritas.com]

The only issue in your case is to match the PWHT temperatures

P22 is a P-No 5A material, so the temperature range is 700 to 760 degC
P91 is a P-No 15E material, so the temperature range is 730 to 775 degC.
So you have to implement a strict control of the PWHT in order not to be lower than 730 and not higher than 760 deg C

best regards

Dr. Georgios Dilintas

Authorized Nuclear Inspector
Authorized Inspector Supervisor

I&F REGIONAL TECHNICAL MANAGER
BUREAU VERITAS PIRAEUS - GREECE

Tel: +30 210 40 63 113 /4 /5
Fax: +30 210 40 63 118
Cell: +30 69 44 64 62 04


Chirag Sandhane ---12/05/2015 08:49:22---Hi rushabh, There is no need of buttering with inconel182. U can use directly B3 for welding of this

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[george....@gr.bureauveritas.com]

Quote "NOTE ONE SHOULD NOT WELD ON AUSTENITIC  ALLOYS, WITH FERRITIC ELECTRODES. Just check the composition from  the basic rules of dilutions The reverse (using austenitic electrode on ferric steel)will work."Unquote.
The reverse also may not work (low FN and hot cracking). Superaustenitic filler metals like 309 are to be used in that case

best regards

Dr. Georgios Dilintas

Authorized Nuclear Inspector
Authorized Inspector Supervisor

I&F REGIONAL TECHNICAL MANAGER
BUREAU VERITAS PIRAEUS - GREECE

Tel: +30 210 40 63 113 /4 /5
Fax: +30 210 40 63 118
Cell: +30 69 44 64 62 04

"'Zeghanu Gigi' via Materials & Welding" ---11/05/2015 11:14:17---Dear Goswami,  As per your last message"   If you buttering with Inconel-182, thereafter welding  wi

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[John Siefert]

There are a lot of bad responses to this question. The question is too broad to address. You need to provide more detail for specific guidance:

1. What is the end application you are trying to qualify Grade 22 to Grade 91? 

2. Is it a creep application? 

3. Is the Grade 22 thick or thin? Is the Grade 91 thick or thin? We need to establish if you are making a matching pipe to pipe, a mismatching pipe to pipe (such as thick-section valve body to a thinner-wall pipe), tube to tube, or stub to header weld. These variations will affect the filler metal selection 

4. If the end application is pipe to pipe, what is design? Will the pipes be matching in wall thickness and inside diameter? Will there be a transition piece between variations in pipe sizes? 

5. Only once you have answered these questions can specific guidance be provided on what to do for your PQR. Otherwise you made need to qualify a range of filler materials to address the potential end-use applications 

All of the options you have tried are inappropriate for welding Grade 22 to Grade 91, we would not recommend the use of Ni-base filler metal for these materials in power generation applications.