Allowable stress on a flare bevel groove weld

[MER3]

I am looking at a flare bevel groove weld and trying to determine the allowable stress on the weld. The 9th edition of AISC has cases for partial pen. welds in several orientations, but I do not see one for shear perpendicular to the axis of the weld. Am I safe in treating it similar to a fillet as 0.3*Ft of the weld rod material? How do others treat flare bevel groove welds?

Thanks

 

[P1ENG]

You need to go to Chapter J of the specifications (part 16 of the AISC). It's been a while since I've had access to the 9th edition, but I'm pretty sure the reference I gave is the same. You will see how to determine the strength via Table J2.5. If you can't find it, I am including a snippet below. Also, for PJP, I don't think there is such a thing as "shear perpendicular to the axis". If it is perpendicular to the axis, it is either tension or compression for a PJP weld (your description would apply to a fillet weld though).

You treat the nominal stress the same (0.6*Fexx) as a fillet. The 0.3 you wanted to use is the result of the 0.6 divided by the safety factor of 2.0. In this case, your safety factor would be 1.88 if perpendicular to the weld axis. Safety factors and design factors became a part of the AISC when they combined ASD and LRFD in the same books.

Juston Fluckey, SE, PE, AWS CWI
Engineering Consultant