impact results - UHT material welding

[Fernando L Neto]

Dear colleagues, 

I hope this email finds all you well

Project: ASME VIII- Pressure vessel - material ASME SA517 Gr B. Thickness 9,5 mm.

 I have to qualify a WPS for welding ASME SA517 - B with impact requirements at -40 C, 

Also is required PWHT, and my first results of impact test @-40C of test plate were very low. (lateral expansion less than 0,2mm and energy less than 20J)

The declared Values of certificate of consumable is 75J @ -73C  !!!

Can the presence of PWHT changes so much the values of impact test? (certificate´s value is "as welded" and my results is "after PWHT".

Any help will be very useful. 

Thanks a lot, 

Fernando Lescovar Neto (IWE)

[Kannayeram Gnanapandithan]

yes in Q&T steel,. before taking up for PWHT, better consult manufacturers for temperature and Time

THANKS & BEST REGARDS,

KG.PANDITHAN, IWE,  AWS-CWI, CSWIP 3.1,

CONSULTANT-WELDING & QUALITY

Mobile no: +919940739349

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[Alan Denney]

There is an assumption here that the weld as deposited met the certificate values which reduced as a result of the PWHT. I don’t expect that you had anything like the certificate results in your weld as-welded. Was it tested in the as-welded condition for comparison purposes? Normally PWHT would improve the results (not always though – because you are into the finer points of the weld metallurgy here). It is the way the weld has been deposited which gave the poor results, not what that consumable can achieve when deposited under ideal conditions.

 

Alan Denney

AKD Materials Consulting Ltd

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[pgoswami]

Hi Fernando,

 

Welding of 517 grades is never easy. It becomes difficult when impact properties are in question. If you could share details about (MTR) the materials, welding consumable, and the failed PQR, then there could be some meaningful suggestions provided.

 

Thanks.

 

 

 

Pradip Goswami, P.Eng,IWE
Independent Welding & Metallurgical Engineering Specialist ,
Ontario,Canada.
ca.linkedin.com/pub/pradip-goswami/5/985/299

pgos...@quickclic.net

pradip....@gmail.com

 

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