Butt Weld Throat Area Equation and Calculation

Weld Design Menu

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

Butt Weld Orientation

Weld Illustration

Throat Area of Butt Weld [mm2, in2]
Full Weld Length
Butt End Tube Weld

Butt End Tube Weld
Throat Area of Butt Weld
Circumferential Tube Weld

Circumferential Tube Weld
Throat Area of Butt Weld #2
Angled Relative to applied load

Angled Relative to applied load

Throat Area of Butt Weld #3
Normal to Applied Load
Normal to Applied Load

Throat Area of Butt Weld #4

 

Butt Weld Orientation

Weld Illustration
Throat Area of Butt Weld [mm2, in2]
Active Load-bearing Length
Butt End Tube Weld

Butt End Tube Weld
Active Load-bearing Length
Circumferential Tube Weld

Circumferential Tube Weld
Active Load-bearing Length #2
Angled Relative to applied load

Angled Relative to applied load
Active Load-bearing Length #3
Normal to Applied Load
Normal to Applied Load

Active Load-bearing Length # 4

 

Where:

A

 = Area in2
= Weld angle [deg]
s = Plate or tube thickness [mm, in]
L = Length of weld [mm, in] 
= pi (3.14157)

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