A double U-shaped butt weld is to connect two plates 200 mm (d) × 20 mm (b), as shown in the figure. What is the stress developed in the weld if it is subjected to a moment of 10000 kN-mm?

A double U-shaped butt weld is to connect two plates 200 mm (d) × 20 mm (b), as shown in the figure. What is the stress developed in the weld if it is subjected to a moment of 10000 kN-mm?