Free Weld Strength Calculator
Estimate the load capacity of a fillet weld based on weld size, length, and allowable shear stress.
Weld Load Capacity
105.2 kN
Weld Load Capacity vs Fillet Weld Leg Size (a)
Fillet Weld Strength
Fillet welds fail through the throat, which is the shortest path through the weld cross-section.
Key Relationships
Effective throat = 0.707 x leg size (for equal-leg fillets at 45 degrees)
Capacity = throat x length x allowable shear stress
The 0.707 factor is cos(45 degrees) = sin(45 degrees), representing the minimum cross-section through the triangular fillet.
Example Calculation
A 6 mm fillet weld, 200 mm long, with 124 MPa allowable shear (E70 electrode).
- 01Throat = 0.707 x 6 = 4.24 mm
- 02Capacity = 4.24 x 200 x 124 = 105,152 N = 105.2 kN
- 03Strength per mm = 4.24 x 124 / 1000 = 0.526 kN/mm
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