huangyhg

flare weld vs. fillet weld question?
i have a question regarding stress in a weld(based on aisc-13th).
say a d=2 weld size by 1"length fillet weld exerted a 2kips load, the stress in weld will be:
f=2kips/[2*(1/16")(sqrt(2)/2)*1"]=22.627 ksi
but if the weld is a flare weld, the stress in the weld will be:
f=2kips/[2*(1/16")*1"]=16 ksi
i.e., with same weld size, the stress in flare weld will be 1.414 times smaller than fillet weld. is above statement correct?
thanks a lot?
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yes, the difference is that the leg size for the fillet is not the throat size. you actually find the throat for the partial pen weld. i would typically not work in ksi, i typically work in k/in. i take the the effective throat of the partial pen weld and multiply it by 1.4 to get an equivalent fillet weld (1.293k/in/16th, 0.928k/in/16th for old asd). then compare that to the actual.
i guess i should say that the reason i always use k/in is that when you treat welds as lines to section properties for torsion or welds subjected to moments, j is in in^3 (not in^4) and s is in in^2 (not in^3). you can calc out the properties pretty easily, but blodgett several shapes in section 7.4. this is a good section to read just for general knowledge as well.
thanks structuraleit!

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