U Groove Weld Strength Calculation

Talaat, groove design is not a essential variable. is mainly governed by the thickness of the workpiece, the heat input and to saving consumable. Weld strength is the same.

WP

"groove design is not a essential variable"

API 1104

Yes Dolby, you are right. I was talking about ASME XI. Also, we don't have the welding process, for some of them a change of the groove design is essential too.

There is no formula.

Why would you think this?

Your questions are nonsense.

The idea is to fill up the groove with welding material. Once this is done properly, the strength:

1. Is that of the base material that contained the groove or,

2. Is that of the welding material you add or,

3. Is a strength between both 1. and 2.

It all depends on what materials you use and the way the weld has been performed.

The idea is to fill up the groove with welding material. Once this is done properly, the strength:

1. Is that of the base material that contained the groove or,

2. Is that of the welding material you add or,

3. Is a strength between both 1. and 2.

It all depends on what materials you use and the way the weld has been performed.

As others have commented, the idea for preparing a joint with a groove for welding is to ensure full penetration of the weld in the joint

We used U preps on the PHM foils due to the greater strength of the weld when the foil was flexing. Still developed minor cracks.

I'm sorry, I've use acronyms too much......

U preps?

PHM?

PHM= Patrol Hydrofoil Missle boat. It provided a stable platform to fire the gun and launch missles. It was a takeoff of the Jetfoil. I think they are all scrapped out now or being used as fishing boats.

http://en.wikipedia.org/wiki/Pegasus-class_hydrofoil

with the Acronyms,........ Reminds me of a scene in "Good Morning Vietnam"

with Robin Williams playing Adrian Cronaur saying "Excuse me sir. Seeing as how the VP is such a VIP, shouldn't we keep the PC on the QT, because if it leaks to the VC, you could end up an MIA, and then we'd all be put on KP."

https://ceprofs.civil.tamu.edu/llowery/cven446/KeatingNotes/Keating%20Design%20of%20Welds%20Module.pdf

our people use it for fillet weld strength calculation,,, see if it can help.

otherwise just ignore

The strength shall not be influenced by the shape of groove as soon as the weld is properly done ( good penetration, no lack of fusion... ).

What is affected by the shape of the groove is the amount of weld deposit ( i.e time & money ).

What is affected by the shape of the groove is the amount of weld deposit

In ASME, the weld deposit, I believe was called reinforce. And too much was frowned upon and can be rejected by our AI.

As far as I was knowing the weld deposit is all filler material added.
That's include what is inside the groove AND IN ADDITION the reinforcement.
The reinforcement is only the part of the weld that is above the level of base metal surface for butt weld and the one that is above the theoretical throath for fillet weld.

Of course that higher reinforcement than the specification may be rejected by inspector ( for usual applications and thicknesses, maximum accepted reinforcement height is 1.5mm to 3 mm - depending on the code used.)
However what is inside the groove is not reinforcement and this is the main amount of weld that is unnecessary added, if wider groove is used.