Question 3 (a) In terms of processing temperature and substrate interaction what are the characteristic differences between soldering/brazing and welding? (b) What are the advantages and disadvantages of Metal Inert Gas (MIG) welding compared to Oxyfuel Gas (Flame torch) Welding? (c) In terms of microstructure and performance, why is welding the worst thing you can do to a processed metal product? (d) Describe the microstructure of the fusion zone, heat affected zone and unaffected zone of a welded join of cold-rolled aluminium plate. (Use diagrams where necessary) (e) What are the three methods of relieving/reducing residual tensile stresses in a welded product