Dear Mr. hedge,
If you are doing the NGW on 180mm Thk, then it will require some special nozzles to go deep inside the groove.
Best regards,
Shadab Alam Ansari
Welding Engineer
For Gulf Heavy Industries Co
One of Al-Bassam Group of Companies
Cell Phone No: 00966502090165, Fax No:0096633410105
Telephone No: 0096633400098 (5 Lines) Ext: 232
Email: ansari@ghi.com.sa
Web: "www.ghi.com.sa"
Save paper, don't print any emails unnecessarily. Let's save environment for future generation....
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Prakash Hegde
Sent: Saturday, November 20, 2010 3:01 PM
To: materials-welding@googlegroups.com
Subject: Re: [MW:8335] RE: 8242] FW: 8050] Weld Joint Preparation for Thk=146mm
We have tried the NGW with single bevel by keeping 3 degree included angle with 10R at root for thk up to 180 mm w/o any problem for CS and LAS material
Regards
Hegde P.B.
From: Vanchinath S.A. <vanchinaths@gmail.com>
To: materials-welding@googlegroups.com
Sent: Fri, 19 November, 2010 8:59:27 PM
Subject: Re: [MW:8327] RE: 8242] FW: 8050] Weld Joint Preparation for Thk=146mm
For narrow gap welding with single bevel with included angle of 5 degree, there will be radius at the root of the joint of 6 or 8mm. this will ensure bead width is greater than depth to avoid solidification cracking problem.
regards
vanchi
On Sun, Nov 14, 2010 at 10:57 AM, Shadab Alam Ansari <ansari@ghi.com.sa> wrote:
Dear Sir,
If we are going for Narrow groove welding with only single bevel and less degree, For SAW welding, there will be solidification cracking problem since the depth to width ratio will not be maintained as 3:1.
Please suggest.
Thanking you,
Best regards,
Shadab Alam Ansari
Welding Engineer
For Gulf Heavy Industries Co
One of Al-Bassam Group of Companies
Cell Phone No: 00966502090165, Fax No:0096633410105
Telephone No: 0096633400098 (5 Lines) Ext: 232
Email: ansari@ghi.com.sa
Web: "www.ghi.com.sa"
Save paper, don't print any emails unnecessarily. Let's save environment for future generation....
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of pgoswami@sympatico.ca
Sent: Sunday, November 14, 2010 12:19 AM
To: materials-welding@googlegroups.com
Subject: [MW:8242] FW: 8050] Weld Joint Preparation for Thk=146mm
Hi Shadab,
If you do not have the machining capacity for Narrow Gap joints ( 2-5 deg included angle), then this joint should be fine. I would like to suggest some fine points based on my past experiences in shop welding for thick walled pressure vessels:-
- Long Seams-Remove the backing strip altogether. Rolling the backing strip to shell contour and making perfect fit up is quite difficult in double vee weld. Moreover when backing strip gets fused while welding, one has to do immense gouging to remove it completely. Hence a conventional double vee joint, 2/3Vee Outside(45 -50 deg included angle) and 1/3 Vee inside (55-60 deg included angle) may be a good option. Such joints may be prepared by high power gas cutting and grinding. Weld metal deposition may be more, however if welding has and power are equipped with Tandem or Twin Arc SAW, one can make up for the fabrication time.
- For C Seams-- you may adopt a quasi narrow gap bevel to start with. A sample bevel is shown in the attachment. The included angle may be chosen to be anything between 10-20 deg and the edge preparation be done with gas cut followed by machinning.Placing a backing strip would be the joint fit up easy.
For welding of thickwalled plates, Narrow Gap welding(2-5 de included angle) is the best choice, due to less distortion, better weld and HAZ properties,considerabe savings on weld metal, fabrication time etc.But without good machning facilities,this process ia almost difficult to implement.An alternative may be edge prep and rolling in outside shops, then perfom welding at fabricator's workplace, busometimes thatmay not e a realistic solution.
Thanks
Pradip Goswami,P.Eng.IWE
Welding & Metallurgical Specialist & Consultant
Email-pgoswami@sympatico.ca,
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Shadab Alam Ansari
Sent: Wednesday, November 03, 2010 6:05 AM
To: materials-welding@googlegroups.com
Subject: [MW:8050] Weld Joint Preparation for Thk=146mm
Dear All,
We are having 146mmthk shell welding for P1 material with PWHT & Impact as per ASME SEC-VIII Div.2
Please give me best possible weld configuration. We don’t have facility to make J grooves.
Is there any portable machines available in the market to make J grooves on such high thick plates.
I have prepared one sample Bevel edges as attached below.
Error! Filename not specified.
Waiting for reply.
Thanks!!!!!!!!
Regards
Shadab
Welding Engineer
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