Abstract
ABSTRACTIn this paper, an attempt has been made to correlate and optimise the plasma transferred arc welding parameters such as transferred arc current (TC), powder feed rate (PF), speed of oscillation (SO), welding speed (WS) and plasma gas (PG) so as to enhance the surface characteristics. The investigations are carried out by considering width-to-reinforcement ratio (W/R) and surface hardness as key responses. The empirical relationship of responses isdeveloped using response surface method (RSM). From this investigation, it is found that the maximum hardness of 47.59 HRC could be achieved with a moderate 4.5 W/R for the deposit. The optimised processing conditions show the transferred arc current (TC) 126 A, welding speed (WS) 100 mm/min, powder feed rate (PF) 13 g/min, speed of oscillation (SO) 600 mm/min, and plasma gas (PG) 2.9 L/min.
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