J groove bevel end requirement

[Prabhakar Raj]

Can anyone give me code reference for J groove bevel end  requirement above 22mm wall thickness.  Is it mandatory to go for J groove.?

[george....@gr.bureauveritas.com]

No it is not. The form of bevel in compromise between accessibility and volume of deposited weld metal

Sent from my BlackBerry 10 smartphone.

From: Prabhakar Raj Sent: Τετάρτη, 22 Απριλίου 2015 - 06:55 To: materials-welding@googlegroups com Reply To: material...@googlegroups.com Subject: [MW:23137] J groove bevel end requirement

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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[raouf salhi]

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 <prabha...@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.?

[c sridhar]

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.

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From: 'raouf salhi' via Materials & Welding <material...@googlegroups.com>
To: "material...@googlegroups.com" <material...@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 <prabha...@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.?

---------------------------------------------

[Prabhakar Raj]

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

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[Jim Price]

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.

To view this discussion on the web visit https://groups.google.com/d/msgid/materials-welding/CA%2B-71w-QXwATtVpGbYkG6%2BcknT6MonMGSJw%3D5%3Dg8%3DWN-hgFD7g%40mail.gmail.com.

[Sridhar C]

It is ok. U & J are done by shaper, planner. 'U' could be done by air arc gouging & grinding.
Even it costs addional   for above optarions, it is worth as welding cost is 4 to 5 times more than ur base metal. We say, 'avoiod welding. If not minimise it to redce the distortion & cost of fabrication'
Now, the choice is yours.

Sridhar.

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From: Prabhakar Raj
Sent: ‎22-‎04-‎2015 18:55
To: material...@googlegroups.com
Subject: Re: [MW:23144] J groove bevel end requirement

To view this discussion on the web visit https://groups.google.com/d/msgid/materials-welding/CA%2B-71w-QXwATtVpGbYkG6%2BcknT6MonMGSJw%3D5%3Dg8%3DWN-hgFD7g%40mail.gmail.com.

[Noe Mota]

I believe the joint design preparation is more dependable on the type of the selected welding process, targeted mechanical properties and structural application.

Regards

Noé

On Tuesday, April 21, 2015, Prabhakar Raj <prabha...@gmail.com> wrote:

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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[GENE MATSKO]

 I do not believe you will find a code reference for the J groove bevel usage. It has been standard industrial practice here in the U.S. in the past that when your wall thickness is 0.75 in. & above one should select a J groove prep & I.D. counter bore so as to obtain the optimum fit-up with little or no I.D hi-lo & optimum access to deposit your root bead. With a  straight ' V ' groove your access to deposit an acceptable root bead in 0.75 in w.t. & above is difficult because of the tight angle at the root. Generally we use GTAW for the root & 2nd pass then switch to SMAW for the remaining fill passes.

We use this procedure for most of our 100% RT joints on Nuclear, Fossil, Refinery & chemical plants.

Gene Matsko

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