Dear Sir
We tried with various rootfaces upto 5mm and current upto 500-550A,zero gap, but no penetration achieved in root pass. Also we tried with various travel speeds but no uniform penetration achieved.
I feel that only ceramic backing is the solution to weld single sided joints with SAW..
Regards
Prem Nautiyal
On Mon, 22 Sep 2008 Chaitanya Purohit wrote :
>Dear Prem,
>
>To weld with just SAW from one side itself, you need to provide zero root
>gap with 5mm root face at the beveled member. Use current 550-600 Amps and
>try. I do not see any problem to get the root fusion.
>
>C. K. Purohit
>General Manager - QA/QC/NDT/R&D
>KNM Process Systems Sdn Bhd.
>HP : +616 3376448
>Phone : +603 89460338
>Fax : +603 89460333
>
>
>-----Original Message-----
> From: "Bathula Raghuram \(Mumbai - PIPING\)" <R.Bathula@ticb.com>
>To: <materials-welding@googlegroups.com>
>Date: Mon, 22 Sep 2008 20:06:19 +0530
>Subject: [MW:1158] RE: 1150] SAW - For Single sided joint
>
>
>Why not GTAW+SAW? Full SAW may not give you full penetration + defect free
>in UT
>-----Original Message-----
> From: materials-welding@googlegroups.com
>[mailto:materials-welding@googlegroups.com]On Behalf Of PREM SHANKARDUTT
>NAUTIYAL
>Sent: Saturday, September 20, 2008 4:36 PM
>To: materials-welding@googlegroups.com
>Subject: [MW:1150] SAW - For Single sided joint
>
>
>
>Dear Friends
>
>We are trying to establish SAW for single sided joint. The base metal is
>SA516Gr.70. The joint is 25mm thick. The joint is a single bevel groove but
>joint with included angle of 45degree ( one member is vertical and there is
>bevel on other member).The final NDT is UT.
>Presently we are welding this joint with TIG+SMAW.The joint is circular
>hence ideal for SAW.
>Now we want to try to weld this single sided joint completely with SAW. This
>is for productivity improvement.
>Is it possible to weld this joint having no access from other side with SAW
>completely ?
>Can we keep zero gap, zero rootface, and achieve full penetration joint with
>SAW??
>If yes what should be the parameters, wire dia., etc.
>We dont want to use any ceramic backing.
>Can anyone suggest how to weld this joint completely with SAW.
>This is a development activity. Please share your experience...
>
>Regards
>
>Prem Nautiyal
>
>PREM S NAUTIYAL
>CELL : 9820313278
>
>
>
>
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