where expertise comes together - since 1996

Web's Largest Portal of Nondestructive Testing (NDT)
Open Access Database (Conference Proceedings, Articles, News), Exhibition, Forum, Network

All Forum Boards
Technical Discussions >
Compound weld joints (37-10)
Career Discussions
Job Offers
Job Seeks
Classified Ads
About NDT.net
Articles & News

Canadian Institute for NDE
We are specialized in training for Radiography, Ultrasonics, Magnetic Particle, Liquid Penetrant, Eddy Current and emerging NDT technologies.

5380 views
21:03 Jan-16-2010
David Bunch
Compound weld joints (37-10)

I have a few questions about compound weld joints. First, what is the main reason for using them? Secondly. I have seen a few diagrams that show the 37 degree portion of the weld extending upwards for 3/4", and the remainder of the weld is at a 10 degree angle. So does this mean that the 37 degree portion of the weld has a fixed height of 3/4" and the remainder of the weld (regardless of thickness) is at 10 degrees?

Here is a diagram that I have been looking at: http://www.globalspec.com/RefArticleImages/8DE033B4047F3F210EE55EDEB387249B_2_CH02_54.gif

 
00:38 Jan-17-2010

Juan Amado

Engineering, Inspection
Arco Industrial, S.A.,
Panama,
Joined Nov 2001
44
Re: Compound weld joints (37-10) In Reply to David Bunch at 21:03 Jan-16-2010 (Opening).

David:

The main reason for using such joints is to minimize the amount of weld metal to be added to the joint. This creates savings in time, weld metal, labor, energy and measures to prevent distortion. This savings must offset the cost of preparing such a joint, which are higher than creating a conventional straight bevel.

The 3/4" dimension, at which the angle of the bevel changes direction, has to do with the fact that at that point the 37.5 angle has created enough of an opening to be able to access the joint with the welding process to be used. This dimension, however, is not written in stone, you should be able to create a joint that is appropriate for what you are doing, but I think you will find that in many cases it will be a nice size to work with.


Hope this helps.

Best regards,
Juan Amado

 
05:28 Jan-17-2010

Nigel Armstrong

Engineering, - Specialist services
United Kingdom,
Joined Oct 2000
1094
Re: Compound weld joints (37-10) In Reply to Juan Amado at 00:38 Jan-17-2010 .

David,

As Juan says, on thick material access is required to put in the root, hence the bigger included angle for the bottom 10 - 15mm. Once sufficient access has been made the narrower included angle 6 - 10 degrees requires less weld metal, less runs and potentially a sounder joint.

The compound bevels and the J-bevel are a principal reason for the drive to encoded UT, a combination of automated or semi-automated PA, TOFD and PE. Tandem and zonal discrimination techniques may be required for the steep fusion faces.

 


© NDT.net - The Web's Largest Portal of Nondestructive Testing (NDT) ISSN 1435-4934

Open Access Database, |Conference Proceedings| |Articles| |News| |Exhibition| |Forum| |Professional Network|