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[MW:10298] RE: 10223] Looking for WPS for A182 F22 to HP Nb Mod ( 35% Ni , 25%Cr Material)

By Materials & Welding

Hi Akash,

The default GTAW welding filler for this alloy would be Inconel-617 or equivalent. If HP-Nb-Mod is a service aged component, solution annealing of the tube ends before welding would be advisable. Preheat and interpass control should not exceed 125 deg C.

I would think for a dissimilar weld joint as above Inconel -625(E-NiCrMo-3) also would be a good choice. This filler may have slightly lesser creep strength as compared to HP Nb Mod alloy, however would exceed the design properties of A 182F22 alloy.

Te attached idemitsu article explains the pros and cons of both type of filler metals.

Thanks.

Pradip Goswami,P.Eng.IWE
Welding & Metallurgical Specialist & Consultant
Ontario,Canada.
Email-pgoswami@sympatico.ca,
pgoswami@quickclic.net

-----Original Message-----
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of ak1965
Sent: Tuesday, March 08, 2011 10:58 AM
To: Materials & Welding
Cc: averma@indorama.com.ng
Subject: [MW:10223] Looking for WPS for A182 F22 to HP Nb Mod ( 35% Ni , 25%Cr Material)

We need to butt weld many joints in the outlet of ethylene furnace with following material specs:-


Base Metals :- HP Nb Mod. (35% Ni & 25% Cr) & A 335  F22 ( 2.25% Cr &
1 Mo)

Pipe Thicknesses : 11 mm ( both pipes)

Service Temperature : 900 Deg C


Please help to prepare WPS for this typical joint and also what NDT is required to establish the integrity.


Regards

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