Re: [MW:35286] SA335 P91 to SA106Gr.B Dissimilar Material Welding Procedure

not at all advisable to weld P1 directly with P91

Any thing can be welded but what is the metallurgical effect on properties of the weldments. ( Lower Critical temp for P1 material is 725 Celsius)

THANKS & BEST REGARDS,

KG.PANDITHAN, BE, IWE,  CSWIP 3.1,

ISO 9712 Level 2 in VT,

ASNT-Level II in PT,MT,RT & UT,

LA ISO 9001-2015, ISO 3834, EN 15085, 

International Welding Engineer. 

CONSULTANT-WELDING & QUALITY

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On Thu, Sep 19, 2024 at 9:15 PM sridhar cn <sridharcn305@gmail.com> wrote:

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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