ENGIN 27 Final: e27-sp2015-final-Taylor-exam
Document Summary
In laser welding, a laser beam passes along the joint that is to be welded, at a constant rate and with constant light intensity. The optical energy in the beam heats the steel and melts it. Find an approximate value for the energy needed to melt 1 mm3 of mild steel [2 points]. Assume a heat transfer coefficient of 0. 8 and a melting factor of 0. 8. [6 points] (b) in arc welding processes, explain the function of: 2 (c) describe and explain the approach that is specifically used in the tig welding of aluminum to help remove oxides from the surface of the weld pool. 3 (e) describe the electrical resistance welding processes of spot welding and seam welding. An explanation of the potential advantages of electrical resistance welding over arc welding; An explanation of why the weld nugget forms at the interface between the material sheets being joined, rather than at the electrode material interface;
