Single Bevel or Double Bevel welding preparation.

faizol · **Posted:** Wed Aug 27, 2008 6:24 am

Dear Members,

i have thick wall vessel (40mm thickness), could anyone clarify which code or standard are mention to provide single or double bevel and what is and effect if applied single bevel.

Thank you. :wink:

sanjeev_shukla70 · **Joined:** Wed Apr 18, 2007 2:05 pm **Posts:** 260

Groove design (single or double bevel) will depend on various factors such as accessibility from both the side, economics of weld joint (time taken for completing weld joint, Total volume of deposited weld material) etc.

ASME B 16.25 can be used as a reference even though it is applicable for piping joints.

Regards

Sanjeev

faizol · **Posted:** Wed Aug 27, 2008 2:13 pm

Dear Sanjeev,

Thank you sir, so i can used single bevel for thickness is 40mm because as per engineering practices, thickness more than 19mm shall be double bevel? :oops:

sanjeev_shukla70 · **Joined:** Wed Apr 18, 2007 2:05 pm **Posts:** 260

Faizol,

Engineering practices are based on years of experience and considering all the aspects of mentioned in my previous post. These are to be followed in general however exceptions are always there.

Single bevel can be made for higher thickness but not recommended unless you have constraints like accessibility etc.

Even if you work out total weld metal deposit in the groove, it will be much more in case of single bevel as compare to double bevel and therefore more metal deposit, more time and also high heat input.

Regards

raghurambathula · **Joined:** Tue Jan 29, 2008 5:00 pm **Posts:** 103

if you can, you can go for Double U or J groove for more economical way :!:

faizol · **Posted:** Wed Sep 03, 2008 8:07 am

Dear Team,

that have a calculation for double bevel weld joint? or have diffrent calculation between single and double weld joint?.

appreciate if anyone could provime me calculation.

thank you. :roll:

Gonzaga · **Joined:** Sat Dec 15, 2001 1:00 am **Posts:** 657

faizol wrote:

Dear Team,

that have a calculation for double bevel weld joint? or have diffrent calculation between single and double weld joint?.

appreciate if anyone could provime me calculation.

thank you. :roll:

Joint efficiency is based on type of weld and extent of NDE (RT). Both welds, I presume, are type 1 and same RT extension, so, no difference in strength calculation.
Mauro

faizol · **Posted:** Thu Sep 04, 2008 3:21 am

Dear Gonzaga,

Sir, i'm lack of knowledge in weld type and not deeply understand what you mean. Sorry Sir, could you clarify to me or any reference book to study about this.

Thank ou.

sanjeev_shukla70 · **Joined:** Wed Apr 18, 2007 2:05 pm **Posts:** 260

Faizol,

Please refer to fig UW 3 and UW 12 of ASME Sec VIII Div 1.

What is meant in Mauro mail that if JE is same then for strength calculation there is no difference for either of single bevel or double bevel weld joint.

Can you further elaborate on your question, is it regarding strength calculation or some thing else?

Regards

akonrad · **Posted:** Thu Sep 04, 2008 9:58 am

Faizol, give more details. What weld (circumferential, longitudinal), what part to what part (dished end to shell, shell to shell course), what material (what spec&grade), what welding technique, what is internal diameter of your shell etc. Otherwise you are getting what you asked for: rubbish.

faizol · **Posted:** Thu Sep 04, 2008 10:11 am

Dear Akonrad,

Sir, i mean for all part (Cir.seam to Cir.seam, Long.seam to Long.seam, thin thickness nozzle to shell). Internal diameter around 1500mm to 2000mm and thickness is araound 40mm to 53mm. I'm worried about HAZ when i apply single bevel for thin wall nozzle to the thick wall vessel.

Thank you. :wink:

akonrad · **Posted:** Thu Sep 04, 2008 10:29 am

and the material is...
and the welding technique is...
and your engineer's tenure is...

amol · **Joined:** Mon Sep 01, 2008 2:40 pm **Posts:** 64

U CAN REFER FIG.UW16.1-a,j

Single Bevel or Double Bevel welding preparation.

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