Plug Weld Joint Calculation Formulas

Comparative stress for all types of plug and spot welds

where:

	τ Z	shear stress in the weld base area [MPa, psi]
	τ 0	shear stress in the weld peripheral area [MPa, psi]
	α	conversion factor of weld joint [-]

Plug weld - perpendicular

Shear stress in the weld base area

Shear stress in the weld peripheral area

where:

	F	acting force [N, lb]
	d	diameter of plug weld [mm, in]
	i	number of welds [-]
	s	plate thickness [mm, in]

Plug weld - with bevel

Shear stress in the weld base area

Shear stress in the weld peripheral area

where:

	F	acting force [N, lb]
	d	diameter of plug weld [mm, in]
	i	number of welds [-]
	s	plate thickness [mm, in]

Groove weld - perpendicular

Shear stress in the weld base area

Shear stress in the weld peripheral area

where:

	F	acting force [N, lb]
	b	groove weld width [mm, in]
	L	groove weld length [mm, in]
	i	number of welds [-]
	s	plate thickness [mm, in]

Groove weld - with bevel

Shear stress in the weld base area

Shear stress in the weld peripheral area

Meaning of used variables:

F	acting force [N, lb]
d	diameter of plug weld [mm, in]
b	groove weld width [mm, in]
L	groove weld length [mm, in]
i	number of welds [-]
s	plate thickness [mm, in]
τ Z	shear stress in the weld base area [MPa, psi]
τ 0	shear stress in the weld peripheral area [MPa, psi]
α	conversion factor of weld joint [-]