The cylindrical section of a pressure vessel was fabricated with a helical weld as shown. Determine the normal and shear stress acting on the weld when the tank is subjected weld. to an internal pressure, p. Show all the stresses on a stress element oriented along the tank internal diameter = 3.2 ft wall thickness-3/16 in internal pressure = 200 psi θ=50" Ans: Onormal to plane 14.5 ksi En plane =-5.04 ksi