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]