Thursday, June 10, 2010

[MW:5497] FW: 5456] RE: 5437] How to control the hardness in P22

 
 

Dear Mahendran,

 

It's very difficult to achieve ASME B31.3, 241 HB hardness without PWHT. If repair or fabrication weld is done with utmost control you would end up with hardness readings in the range of 280-300 HB, without PWHT.

 

As mentioned below by Mr Prabhukumar B-31.3 allows welding without PWHT up to 13mm thickness. To avoid PWHT on weld repair, you have to aim for a temperbead welding repair, with  lots of control. TEMPER BEAD REPAIR IS COMMONLY PERFORMED ON EQUIPMENTS IN SERVICE, WHERE PWHT IS TO EB AVOIDED..HENCE EXTRA CARE DURING WELDING IS REQUIRED.

 

Most popular welding techniques for temperbead repairs are SMAW and GTAW. The welding technique and groove/ excavation details should be similar to  the ones shown below. For temperbead welding on SA-335 P22, the choices are SMAW –E-8018B3L, GTAW-ER-80SB3L.  

 

Nuclear repair codes, ASME-Sec-XI , allows temperbead repair on P1,P3,P4 alloys, P5A is a touch and go. While for repair on ASME Sec-I, B-31.1 components, National Board Inspection Code, allows temperbead repair on P1, P3,P4,P5A materials. I have attached some sample data on repairs on P4, P5A alloys for your information.

 

If you require any more help on temperbead welding feel free to write.

 

Thanks.

 

 

Pradip Goswami,P.Eng.

Welding & Metallurgical Engineer/Specialist

Ontario Power Generation Inc.

Email-pgoswami@sympatico.ca,

pgoswami@quickclic.net

 

 

 

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From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Prabhu Kumar L
Sent: Tuesday, June 08, 2010 3:03 AM
To: materials-welding@googlegroups.com
Subject: [MW:5456] RE: 5437] How to control the hardness in P22

Dear Mahendran,

 

Since the material (A335 P22) is highly hardanable after welding, you can try with the following precautions/ restrictions to reduce the hardness level.

 

  • Use increased preheat i.e. 250ºC
  • Follow temper bead technique as suggested in QW-290 of ASME Sec. IX.
  • Post heat immediately after welding – 250 to 300º C for 1 hour and cover the weld area with thermocool in order to reduce the cooling rate.
  • Qualify welding procedure with E8018-B3L / ER80S-B3L (low carbon grade) instead of E9018-B3/ ER90S-B3 to reduce chromium/molybdenum carbides, which will increase the hardness of the weld.

 

Note: Though B31.3 & Sec. VIII Div. 1 allows upto 13mm or 16mm without PWHT, most of the client specification calls for PWHT for all thicknesses for this material due to more prone to hydrogen induced cracking and highly hardanable (air hardening) after welding. Check once again for the requirement of PWHT.

 

Regards,

 

L. Prabhu kumar,

Sr. Principal Engineer,

 

Equipments & Materials Dept.,

Saipem India Projects Limited,

Nungambakkam High Road, Chennai - 600 034, India.

Tel:+91 44 43906588, Ext.: 588, Fax:+91 44 66840345,

Mobile Ph. No.: +91 9003010978.


From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of mahendran p
Sent: Tuesday, June 08, 2010 10:01 AM
To: materials-welding@googlegroups.com
Subject: [MW:5437] How to control the hardness in P22

 

Hi all,

         May any one tell me, how to control the hardness of the P22 materials welding without PWHT. Even, we do pre-heating as per the ASME 31.3 & also we use 2.6mm dia electrode(E9016/8). Still we get the hardness around 290 HB.

 

Any suggestions to control the hardness within 241 HB(ASME 31.3).

 

 

Please help.

Thank you.

Best regards,

P.Mahendran

 

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