Dear Bhatti,
If code of construction as per ASME B31.3/ ASME Sec. VIII Div. 1, there is exemption for PWHT upto 13mm for material 2 ¼ Cr-1Mo materials. However, for materials 9Cr-1Mo, no exemption for PWHT.
For welding of A106 to 2 ¼ Cr-1Mo (without PWHT), as you mentioned you can use ER70S-2/3 and E7018 with following precautions since hardness may not meet the requirements without PWHT.
- Follow temper bead weld technique (carryout buttering of 3-5mm on 2 ¼ Cr-1Mo side and welding between buttered layer to A106) as suggested in QW-462.12 of ASME Sec. IX.
- Increased preheat of around 200-250 Deg. C
- Post heating of at 300 Deg. C for ½ hour
For welding of A106 to 9Cr-1Mo, PWHT is mandatory for 9Cr-1Mo materials for all thicknesses. You can use ER70S-2/ E7018 or ER80S-B8L/E8018-B8L, however after welding PWHT shall be carried out.
Alternative you can avoid PWHT on 9Cr-1Mo side provided buttering with E7018 and PWHT shall be completed. Final welding between A106 to 9Cr-1Mo with ER70-S2/ E7018 with temper bead technique.
Regards,
L. Prabhu kumar,
Sr. Principal Engineer,
Equipments & Materials Dept.,
Saipem India Projects Limited,
Tel:+91 44 43906588, Ext.: 588, Fax:+91 44 66840345,
Mobile Ph. No.: +91 9003010978.
From:
Sent: Monday, June 21, 2010 10:45 PM
To:
Subject: RE: [MW:5692] Welding Procedure
Sorry did mention that , its ASME V Section I, Steam Generator Tubes Turn, I’m aware of test requirements Like mention below.
Its welding P4& P5 and 410 Material to A-106, as per ASME, 2 ¼ cr PWHT is Optional but for 9 Cr is mandatory , What about welding 106 with 2 ¼ or 9 Cr with TIG root and E7018 cover pass and only carryout preheating to 300 F and eliminate PWHT.
Thanks,
From:
Sent: Saturday, June 19, 2010 5:41 AM
To:
Subject: Re: [MW:5658] Welding Procedure
Dear Bhatti,
What is code for Procedure? What is the job? Normally you require tensile,bend,charpy impact(conditional) and macroexamination.
2010/6/17 Bhatti BM (Bashir) at Aera <BMBhatti@aeraenergy.com>
Folks,
We doing Mockup procedure before actual welding, what type tests are required to qualify the welding procedure
I was looking for welding procedures for and filler metals
CS A-106-B and 2 ¼ Cr ,
CS A-106-B and 410
CS A-106-B and 13 Cr
CS A-106-B and 9CR
Thanks , Bashbhat
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K Harish Kumar
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