Two plates with symmetrical V joint penetration of V angle 60deg are to be arc welded in a single pass. The power P(kW) – P = 4+0.8L-0.1L2 Assuming that the top surface of the weld is flat & flush with the plate top surface, & and energy losses are 20%, The density of filler material is 8gm/cc and the energy required to melt 1 gm is 1400 joules. The plate dimensions are 1000mm length & 5mm thickness. The maximum welding speed is….