A 1/2-in by 2-in rectangular-cross-section UNS G10150 HR bar carries a static load of 16.5 kip. It is welded to a gusset plate with a 3/8-in fillet weld 2 in long on both sides with an E70XX electrode as depicted in Fig. 9–18. Use the welding code method.
(a) Is the weld metal strength satisfactory?
(b) Is the attachment strength satisfactory?
Question : A 1/2-in by 2-in rectangular-cross-section UNS G10150 HR bar...
(a) From Table 9–6, allowable force per unit length for a \frac{3}{8}- in E70 electrode metal is 5.57 kip/in of weldment; thus
F=5.57 l=5.57(4)=22.28 kip
Since 22.28>16.5 \text { kip, } weld metal strength is satisfactory.
(b) Check shear in attachment adjacent to the welds. From Table A–20, S_{y}=27.5 \text { kpsi. }.Then, from Table 9–4, the allowable attachment shear stress is
\tau_{\text {all }}=0.4 S_{y}=0.4(27.5)=11 \text { kpsi }
The shear stress \tau on the base metal adjacent to the weld is
\tau=\frac{F}{2 h l}=\frac{16.5}{2(0.375) 2}=11 kpsi
Since tall \tau_{\text {all }} \geq \tau, the attachment is satisfactory near the weld beads. The tensile stress in the shank of the attachment \sigma is
\sigma=\frac{F}{t l}=\frac{16.5}{(1 / 2) 2}=16.5 kpsi
The allowable tensile stress \sigma_{\text {all }}, from Table 9–4, is 0.6 S_{y} and, with welding code safety level preserved,
\sigma_{\text {all }}=0.6 S_{y}=0.6(27.5)=16.5 kpsi
Since \sigma \leq \sigma_{\text {all }}, the shank tensile stress is satisfactory.
