Question

An ISF 75 x 8 mm is connected to a gusset plate using fillet weld as shown. If the factored load on member is 120 kN (tensile), then the required length of 6 mm weld to safely transmit the load is _____ mm (Take Fe 410 grade of steel)

Answer 1

$\text{Size of weld = 6~mm}$
$\text{Effective throat thickness}\left(t_e\right)=0.7\times 6=4.2mm$
$\text{Strength of weld per unit length}=\frac{f_u{t}_e}{\sqrt{3}{\gamma }_{mw}}$
$=\frac{410\times 4.2}{\sqrt{3}\times 1.5}=662.8N/mm$
$\therefore \text{Required length of weld}=\frac{120\times {10}^3}{662.8}=181.05=182mm$