I agree with the recommendation below but it is not always possible.
You need to consider your interpass temperature requirements, the amount of weld volume with the v joint, do you need to grind the root pass and possibly the hot pass and how you will place the stringer beads in this weld joint.
Just a few considerations.
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Prabhakar Raj
Sent: Wednesday, April 22, 2015 8:13 AM
To: materials-welding@googlegroups.com
Subject: Re: [MW:23144] J groove bevel end requirement
Yes I agree with all of you. To reduce heat input, weld metal and avoid distortion, J or U groove is preferred.
But, our vendor does not have the facility to do U or J groove.
So, is it acceptable to use V groove above 30mm wall thickness as per international codes.
Thanks & Regards,
G.Prabhakar Raju
On 22 Apr 2015 16:53, "'c sridhar' via Materials & Welding" <materials-welding@googlegroups.com> wrote:
To reduce the weld volume, to control weld cost factor and to avoid distortion,
we follow certain design norms like:
a. Single 'V' groove say up to 12 to 14 mm,
b. single 'U' groove for 16 to 20 mm
c. Double 'V' groove beyond 20/25 mm
d. Double 'U groove for 30/40 mm
e. single 'J' groove for 50/75 mm and
f. Double 'J' groove for 75 mm and above.
Similarly, Sq. butt without root gap up to 3 mm thick sheet,
Sq. butt with root gap from 4 to 6 and 'V' groove from 6 to 12 mm and like wise.
But there will be overlap in the material thickness selection in above.
But again, there are many constraints like approach to the joint, position of welding,
process selection, plate to pipe joint, quality requirements, availability of machining
facilities etc. which may change above norms.
Joint design is not a mandatory requirement as per codes.But, joint design helps us
to control distortion, which varies from 3 to 9 deg. and said to be max. in single 'V' joint
and less in 'J ' groove type.
Double 'V', 'U' & 'J' helps to keep the distortion down to 2 to 3 deg. But again it depends
up on process selected and size of electrode used (SMAW) etc.
You can check any design manual for joint details.
C Sridhar.
Technical Adviser - Welding,
for Alsta Pristine Engineering, Bangalore
( SS, AL fabricators & A venture of Advance Institute of Welding Technology, Chennai.,
Mobile nos: 0 94449 71097, 0 7406 326326.
Please don't print this e-mail unless you really need to. Save the environment.
From: 'raouf salhi' via Materials & Welding <materials-welding@googlegroups.com>
To: "materials-welding@googlegroups.com" <materials-welding@googlegroups.com>
Sent: Wednesday, 22 April 2015 2:00 PM
Subject: Re: [MW:23142] J groove bevel end requirement
dear probhakar ;
It's not mandatory you can always use V bevel but in order to minimise volume of weld metal deposit ,and therefore the welding time, we prefer to use J bevel for thikness above 19 mm.
Regards
SALHI Raouf
QA/QC Engineer
Tel: Morocco +212628979891
Tunisia +21621458258
Le Mercredi 22 avril 2015 4h55, Prabhakar Raj <prabhakarmet@gmail.com> a écrit :
Can anyone give me code reference for J groove bevel end requirement above 22mm wall thickness. Is it mandatory to go for J groove.?
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