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Re: [MW:35283] SA335 P91 to SA106Gr.B Dissimilar Material Welding Procedure

By Materials & Welding
Mr. Vijay,
Welding P91 to P1 requires careful consideration. due to differences in their thermal 
and mechanical properties. However you can try with:
a proper edge preparation and alignment (to avoid cracks during welding),
using E 9018-B9 /ER90S-B9 filler metals (GTAW is preferred) which are compatible,
preheat to 150-200deg. C throughout to reduce the risk of cracking during welding,
maintain an interpass temp. below 250 deg. C to minimise thermal stresses and 
avoid embrittlement of weld area.
maintain Argon purging throughout, use nominal current to avoid distortion & 
cracking in P91 material
PWHT at 730-800 deg C with proper holding and to relieve stresses,
allow controlled cooling to avoid embrittlement,
monitor for Carbon migration from P1 to P91 which will affect mechanical properties.

In a nutshell, careful adjustments in heat input, preheating & interpass temp. control, and 
PWHT are necessary to ensure a successful welding and maintaining structural integrity.
rgds,
Sridhar.






On Mon, 16 Sept 2024 at 13:07, Vijay Kumar <vijaytuty@gmail.com> wrote:
Dear Experts,

I need SA335 P91 to SA106Gr.B Dissimilar Material Welding Procedure with some reference codes. 

Please share 

Thanks 
Vijayakumar
+91 8238450968

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