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Butt Weld Section Modulus Equation and Calculation

Weld Design Menu

The following are equations to define the section modulus area of a butt weld that includes the full weld length as well as active loading bearing area.

Weld Illustration

Section Modulus of Throat Area of Butt Weld [mm3, in3]

Full Weld Length Active Load-bearing Length



= Section modulus [mm3, in3]
s = Plate or tube thickness [mm, in]
L = Length of weld [mm, in] 
= pi (3.14157)

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