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Spot Weld Perpendicular Loading of Weld Area Stress Equation and Calculation

Weld Design Menu

The following equation will determine the perpendicular loading weld stress area of a spot weld.

pot Weld Perpendicular Load Stress Calculator

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Tear-off Loading of Weld Area

Tear-off Loading of Weld Area

Comparative Stress

Comparative Stress

Where:
= Shear stress [MPa, psi]
σS = Comparative stress [MPa, psi]
F = Applied force [N, lb]
d = Spot weld diameter [mm, in]
i = Number of welds
α = Coefficient of weld joint

Comparative stresses approaches a different way to calculate stresses caused by the axial force or bending moment that actuate in the plane perpendicular to the weld plane. Generally the stress in welds has normal and tangential components. The method of comparative stresses is based on the fact that the shear strength of weld metal is lower than the tensile strength. To simplify the calculation, weld joints are only checked for shear stresses. But the calculation method is the same as in the standard calculation method. Used calculation formulas are also similar.

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