Greetings !... Normally a base metal gets excessive heat in put, the metal's Mechanical properties like grain structure, toughness tensile strength, yield strength, elongation will be changed. if you are two or 3 times gave heat input the same location the metal's property will change and some time loses its quality... even you are did PWHT on the same metal at the same location... So, avoid this things after the 3rd time repaired, we will go to cut and reweld... But the chemical properties will not be change... This is my opinion...
have a nice day !...
Thanks & Best regards
Krishnasamy. M
Welding Inspector
Fize Al- Shammary Gen. Cont. Est.
Kingdom of Saudi Arabia.
Mob: +966 592823768
Date: Mon, 10 Jan 2011 17:55:11 +0800
From: taufiq_civ@yahoo.com
Subject: Bls: [MW:9164] Weld Repair
To: materials-welding@googlegroups.com
Dear experts,
Here it is what I'm looking for. Too much heat input and longer time for PWHT will significantly reduce toughness and mechanical properties. Can you explain me in more detail? what is happen with chemical composition? Fyi, after verifying document, I found that several welds have been repaired until 3 times, and the system already put in service.
Note: mat'l spec: API 5L Gr B, process: SMAW, root pass: E6010, hot pass:E7018, design code: B31.4
I'm trying to get a good answer from experts.
Thanks in advance.
Dari: manpreet <manpreetsin88@rediffmail.com>
Kepada: "materials-welding@googlegroups.com" <materials-welding@googlegroups.com>
Terkirim: Sen, 10 Januari, 2011 10:17:59
Judul: Re: [MW:9161] Weld Repair
Dear Taufiq,
Since there is not sufficient info provided, I can give you a general idea:-
Repair Welding Procedure often requires PWHT, Repeating weld repair would cause too much heat input and longer time for PWHT which would significantly reduce toughness and mechanical properties, also If you are qualifying wleding procedure in accordance with ASME sec ix make sure you fullfil the requirements of QW-407.2.
Regards
Manpreet Singh
On Sun, 09 Jan 2011 09:17:34 +0530 Shanmugam Palanisamy wrote
>
Dear Taufiq,
Doing welding many time at the same location, the base matel mechnical properity well get change. To avoid the properity change, better to cut and reweld.
regards
Samy
>
>
>
>
On Sat, Jan 8, 2011 at 4:34 AM, Taufiq <taufiq_civ@yahoo.com> wrote:
>
>
Dear all,
>
>Our client specification clearly stated that filler and cap weld may
>be repaired a maximum of 2 times using qualified procedure. I will
>appreciate if anyone can tell me what is going on if we repair the
>weld for more than 3 times?
>
>Thank you and regards,
>
>taufiq
>
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For more options, visit this group's bolg at http://materials-welding.blogspot.com/
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
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To post to this group, send email to materials-welding@googlegroups.com
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For more options, visit this group's bolg at http://materials-welding.blogspot.com/
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
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