Re: [MW:6234] JOINT DESIGN

If you use GMAW alone with single V with 3mm root gap, I am sure you will get sound weld in single layer and no need go for back weld. Do some mockup using good welders to gain the confidence before you go ahead with PQR / propose to client.  

On 1 August 2010 13:18, Eng/ Mostafa Kamel Hussein <mkh_200@yahoo.com> wrote:

OK, but you should to take in your mind that SAW is applied after GMAW as backweld as the product is tank with 6000mm so i suggest to make single square butt joint with 1-3mm gap to ensure the full penetration of GMAW what is your opinion about that??

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From: Chaitanya Purohit <chaitanya_purohit@yahoo.co.in>
To: materials-welding@googlegroups.com
Sent: Sun, August 1, 2010 7:26:30 AM
Subject: Re: [MW:0] JOINT DESIGN

For welding 6 mm with GTAW you have to make single V with root gap at least 3mm.and with just two-three passes you can fill up 6mm of grove. Before applying SAW you shall have atleast 5-7 mm of weld metal as back up to avoid burn through So in this case no point in using SAW.

However if you want to use SAW to increase productivity, its better to go with Square butt with 0 (no) gap. I have tried this practically and achieved sound weld (RT without any defects) with good penetration.

Regards.

On 31 July 2010 14:37, Eng/ Mostafa Kamel Hussein <mkh_200@yahoo.com> wrote:

What is the suitable joint design (single V, square, bevel, ........)  for plate SA-283 Gr.B (S235JR) as the thickness is 6mm and the processes used is GMAW/FCAW+SAW

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C. K. Purohit
Eng-Tech Weld1
Sr Welding Inspector

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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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C. K. Purohit
Eng-Tech Weld1
Sr Welding Inspector

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