The allowable shear stress on the weld using acceptable design principles is 30% of the ultimate tensile strength of the electrode. In this case that would be 30% of 70ksi or 21ksi. The formula to determine weld size goes as follows: Allowable Stress = 30% of UTS = 21Ksi (as explained above) Allowable Stress = Force / Effective Weld Area = 21Ksi
The allowable shear stress for the welds would be 70,000 psi x 0.30 = 21,000 psi. A reduction of 70% compared to the case where the fillet weld was in pure tension.
How to Determine the Shear Strength of a Fillet Weld In our previous post we explained how to determine the strength of a transverse fillet weld. A transverse fillet weld is one that is perpendicular to an applied load. We will now look at how to determine the strength of a fillet weld under shear stress.
Shear refers to the act of cutting something, especially wool from sheep, or to the stress in structural elements causing layers to slide against each other. Sheer, on the other hand, describes something extremely steep, thin to the point of transparency, or outright or complete.
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