SA335 P91 to SA106Gr.B Dissimilar Material Welding Procedure

[Vijay Kumar]

Dear Experts,

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

Please share 

Thanks 

Vijayakumar

+91 8238450968

[Raviraj Gohil]

Dear Vijay Kumar,

Please refer API RP 582 , Table A.1

Thanks & Regards,

 

Raviraj Gohil | Manager - Welding | + 83473 02025 | www.lloydsengg.in 

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[Vishwas Keskar]

This is not a compatible joint configuration 

Add Gr 22 , Gr 11 stub piece  (150 mm long each )as below .

Gr 91 to Gr 22  - 

Gr 22 to Gr 11 

Gr 11 to CS 

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On 16 Sep 2024, at 2:10 PM, Raviraj Gohil <ravira...@lloyds.in> wrote:



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[venkateswara reddy Desireddy]

P91to P1 not correct combination, because of PWHT temperature are different.

Better to do P91 to P22 .

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[Kannayeram Gnanapandithan]

Not advisable due to lower critical temp of CS is around 725 celsius whereas PWHT heat treatment temp for 91 is around 745 to 760 which will affect the properties of CS

Go with Mr Keskar recomondation.

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

Mobile no: +919940739349

On Mon, Sep 16, 2024 at 1:07 PM Vijay Kumar <vija...@gmail.com> wrote:

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[Macario Jr. Palola]

use buttering

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[sridhar cn]

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.

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[Kannayeram Gnanapandithan]

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

Mobile no: +919940739349

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[Vinay]

Dear Friend :

Its not  a recommended combination. But can you please  describe its application? 

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

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[Md Usman Ghani]

Which fillers have to use for P91-P22, nd P22-P11 , P11-106

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[Vishwas Keskar]

P91 - P22 - TYP B91 /B3

P22 -P11- TYP B3/B2

P11-SA 106 - B2/ Carbon steel 

Normally Higher alloy of the consumables

Deployed 

You can decided based on PQR 

Vishwas-IWE

9823472273

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On 23 Sep 2024, at 4:07 PM, Md Usman Ghani <mdushm...@gmail.com> wrote:



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[Mohd Siraj]

this could be part of improper design or RF Pad support welding(fillet)? 

and this question already earlier answered in the group.

this kind of joint can be further welded or joint by weld flange at each and then bolted with insulated bolt., 

however service temperature variation may affect both joint thermal expansion that need to add by metal expansion joint at CS side.

pl do not joint directly by welding. Or else use transition spool as mentioned above if you have multiple WPS's/PQR's to support these welding.