Weld Strength Calculator

Calculate the allowable load capacity and safety factor for fillet or butt welds.

Weld Type

Leg Size / Throat (mm)

Weld Length (mm)

Electrode Strength (MPa)

Applied Load (kN)

Allowable Load

Effective Throat

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Weld Area

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Shear Stress on Weld

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Safety Factor

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Weld Strength Formulas

Fillet: Effective Throat = 0.707 × Leg Size

Butt: Effective Throat = Plate Thickness

Allowable Shear (AISC) = 0.30 × FEXX (fillet)

Allowable Load = Allowable Stress × Throat × Length