RE: [MW:13107] what is the root cause for copper crack in saw welding ?

Hi MPK

I would like to share one practical example from my past assignments.

In UT after SAW welding of CS, we were getting fine cracks.

The WPS was religiously followed and we were confused !

After lot of investigation we found out that our welding operator had made short the SAW nozzle during welding which had caused copper contamination in the weld and resulted in cracks.

Regards

Prem Nautiyal

Mobile +91 9004063879 / 9769316004

--- On Wed, 11/30/11, pgoswami@sympatico.ca <pgoswami@sympatico.ca> wrote:

From: pgoswami@sympatico.ca <pgoswami@sympatico.ca>
Subject: RE: [MW:13103] what is the root cause for copper crack in saw welding ?
To: materials-welding@googlegroups.com
Date: Wednesday, November 30, 2011, 9:22 AM

Hi MPK,

It's a form of solidification cracking caused due to localized segregation of low melting elements. Copper is one of the elements which tends to form so, for C.S and high strength and medium strength low alloy steels.

Please see the reference below.

Thanks.

P.Goswami,P.Eng,IWE

http://content.lincolnelectric.com/pdfs/knowledge/articles/content/weldcracking.pdf

Date: Tue, 29 Nov 2011 16:32:37 +0300
Subject: [MW:13100] what is the root cause for copper crack in saw welding ?
From: ranmi2007@gmail.com
To: materials-welding@googlegroups.com

Dear Experts,
What is the Root cause for copper crack in SAW welding ?

thanks,
MPK

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