Free Weld Length Calculator
Calculate the minimum fillet weld length required to carry a given load based on weld size and allowable shear stress.
lbs
in
psi
Minimum Weld Length
0.00 in
Effective Throat0.177 in
Capacity per Inch3,712 lbs/in
Minimum Weld Length vs Applied Load
Fillet Weld Length
L = P / (t x Fv)
Where P is the applied load, t is the effective throat (0.707 x leg size for a 45-degree fillet), and Fv is the allowable shear stress on the weld metal. For E70 electrodes, Fv = 0.30 x 70,000 = 21,000 psi.
Example Calculation
10,000 lb load, 1/4-inch fillet weld, E70 electrode.
- 01Throat = 0.25 x 0.707 = 0.177 in
- 02Capacity = 0.177 x 21,000 = 3,713 lbs/in
- 03Min length = 10,000 / 3,713 = 2.69 in
- 04Use at least 3 inches of weld.
Frequently Asked Questions
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