Welding Capacity Calculation 7

[JohnRwals]

Hello!

P1 and P2 have exactly the same conditions except top, bottom horizontal welding.
I thought P2 could support greater vertical load.
But...
Which one do you think can support greater load? Why?

Thanks!

JW
R

 

[r13]

BA's case reveals the inefficiency of the weld arrangement of P1 case offered by OP, but does not overturn the weld strength calculations based on literatures. It is too far to say P1 has zero capacity though, unless vertical welds are not considered.

 

[desertfox]

According to the elastic method of weld analysis, it’s the two vertical welds where there is no horizontal weld, that will fail first irrespective of whether P1 or P2 is used.

“Do not worry about your problems with mathematics, I assure you mine are far greater.” Albert Einstein

 

[BAretired]

Sounds like a good argument for not having vertical welds, but with P1 and P2, the vertical welds are in tension and compression respectively at their maximum value. I would have thought the weld is less likely to fail when in compression.

BA

 

[desertfox]

“Do not worry about your problems with mathematics, I assure you mine are far greater.” Albert Einstein

 

[r13]

When member in full bearing (no gap between contact surfaces), the compression side weld does not contribute any strength. But for stress analysis, its property must be accounted for.

 

[desertfox]

I’ve picked some figures and loads randomly for the purpose of illustration in the post above.
If the weld is turned to position P2 then the Z values are just reversed. The neutral axis for the weld outline is located 33.3mm below the horizontal weld, so the vertical legs always have the lower value of Z whether they point up or down, so for any given loading the will always carry the higher stress.

“Do not worry about your problems with mathematics, I assure you mine are far greater.” Albert Einstein

 

[BAretired]

The neutral axis for the weld outline is located 33.3mm below the horizontal weld, so the vertical legs always have the lower value of Z whether they point up or down, so for any given loading the will always carry the higher stress.

The maximum weld stress always occurs at the open end of the vertical weld, but with P1, it is preventing the angle from separating from the embed plate whereas with P2, it is preventing the angle from closing an imagined gap between itself and the embed plate. An unzipping, it seems to me, is more likely to occur with P1 than with P2.

BA

 

[desertfox]

I wouldn’t disagree with you on that BA but as I stated way back provided we size the weld based on the lower Z value then for a given loading,P1 would be okay but it’s not the best use of the material.

“Do not worry about your problems with mathematics, I assure you mine are far greater.” Albert Einstein

 

[HTURKAK]

I am afraid the thread will disappear together with more than a hundred responds . May be OP will delete and go away ?.

I commented to thread in another forum. The thread disappeared , which i am thinking the OP deleted and went a way..