Calculation Formulas for Loaded Tube Joined by Peripheral Butt Welds
Peripheral butt weld loaded with normal stress
Normal stress
where:
F z | axial force [N, lb] | |
A | throat area of the weld [mm 2 , in 2 ] |
Comparative stress
where:
| σ | normal stress [MPa, psi] | |
α 1 | shear stress [MPa, psi] |
Peripheral butt weld loaded with torque
Shear stress
where:
u | constant | |
- for calculation in metric units u = 1000 | ||
- for calculation in English units u = 12 | ||
T | torque [Nm, lb ft] | |
W | section modulus of throat area of the weld [mm 3 , in 3 ] |
Comparative stress
where:
| τ | shear stress [MPa, psi] | |
α 2 | conversion factor of the weld joint [-] |
Peripheral butt weld loaded with combined loading
Resultant reduced stress
where:
| σ | normal stress [MPa, psi] | |
| τ | shear stress [MPa, psi] |
Comparative stress
where:
| σ | normal stress [MPa, psi] | |
| τ | shear stress [MPa, psi] | |
α 1 , α 2 | conversion factors of the weld joint [-] |
Meaning of used variables: