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Re: [MW:28730] Auto Welding Copper back up strip fused with Root run

By Materials & Welding
Dear Riaz , 

Copper inclusion is normal in auto welding of pipelines . Considering your thickness the extent of copper inclusion at root is higher . Identify the area where this issue prevails buy making trials and removing/cutting the joint in form of rings . You can therefore visually see the root and location . Explain the issue to Auto welding technician and see if he can modify the root parameters . But if the change is parameter is beyond the allowable range  you need your PQR to be re qualified . 
Between did the AUTO UT or your approved NDE pick up this copper inclusion???4

On Tue, Dec 4, 2018 at 10:38 AM Ri@z <riaz.rafeeque@gmail.com> wrote:
Dear All, 


We are introduced auto welding on 6.62 MM thickness , API 5L X 70 .  J groove prepared with 2 mm root face and zero root opening. 


Root has supported with copper back up strip/Shoes


But after welding we observed that copper back up strip is melted and fused with root run. 


Kindly help to resolve the issue. What are the possible reason for the problem ?? 


With Regards

Riaz Rafeeque 

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Best regards,

TDK YOKESH

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