Re: [MW:28727] Auto Welding Copper back up strip fused with Root run

Copper pick up may lead to hot cracking. It is better to use ASS or Ceramic

On Tue, 4 Dec 2018 3:54 pm Perumal Govindan <perumalgovindan@gmail.com wrote:

Hi

Still I have not received the required information, please share if possible, send me also photographs of backing strip.

Set root gap from 2 to 3 mm and ensure that the copper backing strip shape as per below picture,

With Kind Regards

P Govindan 

On Tue, Dec 4, 2018 at 12:29 PM riaz rafeeque <riaz.rafeeque@gmail.com> wrote:

We are doing PQT. We are using Copper Back strip. GMAW process

On Tue, Dec 4, 2018 at 12:27 PM Perumal Govindan <perumalgovindan@gmail.com> wrote:

Hi

Please confirm, have you qualified the PQR, if qualified what was the material used as backing strip?

With Kind Regards

P Govindan 

On Tue, Dec 4, 2018 at 9:38 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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