when giving weld size in ASME pressure vessel what standard should be followed AWS D1.1? 1

[manj1987]

when giving weld size in ASME pressure vessel, do we need to follow AWS 1.1. For example when joining single bevel plates butt weld size is normally 60 degree? What is the basis of this?

 

[weldstan]

You do not have to use D1.1 prequalified joints details for ASME VIII applications.

 

[viper3982]

Recommend you look at ASME B16.25 - Buttwelding Ends

https://www.asme.org/products/codes-standards/b1625-2017-buttwelding-ends

 

[mk3223]

ASME pressure vessel should follow the ASME Code for welding. AWS D1.1 is typically used for the structural welding. IMO, depending on the plate thickness, the 60-degree bevel angle is good practice to ensure a good weld metal to cover the groove root without any void or undercut.

 

[gtaw]

A 60 degree bevel is rather large if used in a groove such as a V-groove, U-groove, etc. where both members are beveled. 60 degrees times 2 equals 120 degrees! Wow, that's a lot of weld to deposit!

Best regards - Al

 

[manj1987]

No it 60 degree in total 30 on each side.

 

[gtaw]

The prequalified joint details included in AWS D1.1 that utilize grooved preparations are backed or back gouged to produce a CJP weld. The are instances in piping or pressure vessel construction where backing or back gouging isn't possible because of limited access. Other applications will not allow the use of permanent backing, as such, the use of backing may not be possible.

However, where there is access to both sides or where permanent backing is permitted, the AWS prequalified groove details do provide adequate access for welding.

Most load generated forces have little regard for the different codes. AWS versus ASME versus NAVSEA, Gladass or Happy Hinney, what's the difference?

Best regards - Al

 

[gtaw]

Aw, there in lies the difference between a groove angle and bevel angle.

Best regards - Al

 

[JStephen]

Note that in the ASME welding qualification, that bevel details, etc., are a non-essential variable. Typically, plate will be beveled for the most efficient welding, and that may vary depending on the application and the process.
In general, don't mix the welding codes together- a required weld detail in one may be prohibited in another.

 

Sounds like you need to engage a pressure vessel designer.

"Everyone is entitled to their own opinions, but they are not entitled to their own facts."

 

[r6155]

Also this angle may vary if backing strip is used.

Regards
r6155

 

[gtaw]

My recommendation was intended to prevent some inexperienced designer from making a blunder. Such as specifying a groove angle of 45 degrees with no root opening and wondering why they couldn't achieve a complete joint penetration groove weld.

Then again, the less people know, the more money I make. After all, the groove details are nonessential variables, so have at it. Remember, your pain is my profit.

By the way, if the construction code is B31.3 and classified as high pressure fluid service, the groove details do for all practical purposes become essential variables.

Best regards - Al