 
Normal stress
 
where:
| F | acting force [N, lb] | |
| δ | weld direction angle [°] | |
| A | throat area of the weld [mm 2 , in 2 ] | 
Shear stress
 
where:
| F | acting force [N, lb] | |
| δ | weld direction angle [°] | |
| A | throat area of the weld [mm 2 , in 2 ] | 
Resultant reduced stress
 
where:
| σ | normal stress [MPa, psi] | |
| τ | shear stress [MPa, psi] | 
Reference stress
 
where:
| σ | normal stress [MPa, psi] | |
| τ | shear stress [MPa, psi] | |
| α 1 , α 2 | factor of the weld joint [-] | 
Meaning of used variables:
| A | throat area of the weld [mm 2 , in 2 ] | 
| F | acting force [N, lb] | 
| α 1 , α 2 | factor of the weld joint [-] | 
| δ | weld direction angle [°] |