The steel bracket below is loaded by the static force $\backslash (\backslash$mathrm$\{$F$\}=7\mathrm{.}5\backslash$mathrm$\{$kN$\}\backslash ).$ Find the safety factor at a critical point if the weld material can sustain $120$ MPa $.$ The weld $($blue area$)$ size is $6$ mm $.$ The rest of the dimensions are also in mm $.$

$($Sol: $2\mathrm{.}6)$