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

Butt Weld Section Modulus Equation

Butt Weld Section Modulus Equation

Butt Weld Section Modulus Equation

Butt Weld Section Modulus Equation

Butt Weld Section Modulus Equation

Butt Weld Section Modulus Equation

Butt Weld Section Modulus Equation

Butt Weld Section Modulus Equation

Butt Weld Section Modulus Equation

Butt Weld Section Modulus Equation

 

Weld Illustration

Section Modulus of Throat Area of Butt Weld [mm3, in3]
Active Load-bearing Length

Butt Weld Section Modulus Equation

Butt Weld Section Modulus Equation

Butt Weld Section Modulus Equation

Butt Weld Section Modulus Equation

Butt Weld Section Modulus Equation

Butt Weld Section Modulus Equation

Butt Weld Section Modulus Equation

Butt Weld Section Modulus Equation

Butt Weld Section Modulus Equation

 

Where:

W

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