Throat Area of Fillet Weld Joint Calculation Formulas
Weld design | Throat area of fillet weld A [mm 2 , in 2 ] |
for full weld length | for load-bearing (active) weld length |
| 
| A = a L | A = a (L - 2 a) |
| 
| A = a (H + B) | A = a (H + B - 2 a) |
| 
| A = a 2 H | A = a 2 (H - 2 a) |
| 
| A = a 2 B | A = a 2 (B - 2 a) |
| 
| A = a (H + 2 B) | A = a (H + 2 B - 2 a) |
| 
| A = a (2 H + B) | A = a (2 H + B - 2 a) |
| 
| A = a 2 (H + B) | - |
| 
| A = 2 π a (r + a / 2) | - |
| 
| A = a 2 L | A= a 2 (L - 2 a) |
| 
| A = a (2 H + B), A = a (2 H + B - 2 t) | A = a (2 H + B - 6 a), A = a (2 H + B - 2 t - 6 a) |
| 
| A = a 2 (H + B) | - |
| 
| A = a 2 (H + B), A = a 2 (H + B - 2 t) | A = a 2 (H + B - 4 a), A = a 2 (H + B - 2 t - 4 a) |
| 
| A = a 2 (H + 2 B), A = a 2 (H +2 B - s) | - |
| 
| A = a 2 (H + B), A = a 2 (H + B - 2 t) | A = a 2 (H + B - 4 a), A = a 2 (H + B - 2 t - 4 a) |
| 
| A = a 2 (2 H + B), A = a 2 (2 H + B - s) | - |
Meaning of used variables:
a | fillet weld height [mm, in] |
B | width of weld group [mm, in] |
H | height of weld group [mm, in] |
L | weld length [mm, in] |
r | weld radius [mm, in] |
s | web thickness [mm, in] |
t | flange thickness [mm, in] |