1. Achieving FPW using single sided SAW is not possible unless you provide a backing strip, say ceramic backing strip that may be removed after welding
2. What is the dia of circ seam that you intend to weld - SAW wire dia will depend on that; typical angular offset of the wire wrt axis will be approx.3-5 degree on uphill side
3. if you have one square edge on the bevel, try to tilt the joint by 45degree so that the joint is in flat position. Alternatively give 22 degree bevel on both bevels
4. Root and Hotpass by GTAW or SMAW root using E7010 / E7016 will be required in order to avoid burn through
trust this helps out - will require trials to establish the correct parameters and bead placement
Cheers
Date: Sat, 27 Sep 2008 16:59:31 +0000
From: prem_nautiyal@rediffmail.com
To: materials-welding@googlegroups.com
CC: ck@knm-group.com; R.Bathula@ticb.com
Subject: [MW:1171] Re: 1150] SAW - For Single sided joint
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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