Simple weld group engineering question
Simple weld group engineering question
(OP)
If I'm calculating stresses in a weld group due to out of plane bending, as in a rectangular tube fillet welded all-around to a rigidly supported base plate:
Section modulus = bd + d*d/3 based on a line thickness of unity (1.0). Then say for instance, that b=2 and d=3 so that the equation yields 9.0 (using line thickness = 1.0). Do you just multiply by weld throat size to "scale" the value down correctly? I.E., if the weld throat was .333 would the correct section modulus be 3.0?
Section modulus = bd + d*d/3 based on a line thickness of unity (1.0). Then say for instance, that b=2 and d=3 so that the equation yields 9.0 (using line thickness = 1.0). Do you just multiply by weld throat size to "scale" the value down correctly? I.E., if the weld throat was .333 would the correct section modulus be 3.0?





RE: Simple weld group engineering question
fw = M/S
fw = force in weld (kip/in)
M = applied bending moment (kip-in)
S = Section Modulus (in*in)
Then for say a fillet weld...
Fw = Allowable weld Stress * effective throat
effective throat = .707 * tw (for a 45 degree fillet)
tw = weld thickness = 1/4" or 5/16" etc.
setting (Fw = fw) you can solve for tw. I am not sure if that's what your looking for, but that is the general procedure.
RE: Simple weld group engineering question