RE: [MW:19387] Inconel repair

Hi Venkat,

 

High Alloy refinery tubes fail because of  dramatic loss of RT ductility due to precipitated carbides. However, in this case the welded joints have lasted a reasonable period of time .

Few factors to be considered for making sound & serviceable tube repair  welds. These are as below:

1.       Tube wall soundness to be determined –extent of stress rupture damage, oxidation, carburization etc.

2.       Selection of Filler metal  with sufficient Creep properties & good weldability (Please review the attached PDS)

3.       Effect of solution annealing in restoring ductility

4.       Joint preparation

5.       Welding process, techniques, sequence etc.

 

Hope this helps..

Thanks

 

With Regards

Amitabha Bhattacharya

voestalpine Bohler Welding India Pvt. Ltd.

voestalpine Bohler Application Technology Centre

M. +91-98 33998246

www.voestalpine.com/welding

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of N VENKATESWARA PRASAD
Sent: Tuesday, November 26, 2013 6:35 PM
To: materials-welding
Subject: [MW:19383] Inconel repair

 

Dear Experts,

 

Material : Inconel  ( Ni: 31-34 %, Cr: 19-21%, Nb 8 - 10%)

 

Opearting Temeprature:  840 deg.C

Pressure   :  20 bar

Fluid : Methane reformed gas

Service:  Non sour

 

The  header pipe is 10" and  weleded with 28 weldelets of  welded on the head pipe as branch connetions.  After almost 6 years of service, cracks are noticed almost on all the weld toes.

 

Initially these joints are welded by GTAW process by using ERNiCrCoMo-1.  No PWHT.

 

Now one of expert has advised to remove all cracks by grinding,followed by DP,  Then solution annealing at 1100-1150 deg C for 3 hours and welded by ER NiCrMo3 after solution annealing.

 

Please advise whether it is correct.

Can ER NiCrMo3  have resistance to 840 deg. C

 

Please give suggestions for repair

 

Regards

 

Venkat

 

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