[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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