Plasma Welding Process of Nickel Alloy N6 with Filler Wire
The 6 mm pure Nickel N6 plates was welded with filler wire using automatic plasma welding.Compared with welded joint without filler wire,the optimal process parameters of plasma welding with filler wire were determined.The results are as follows:well formed welded joint can be obtained by determining proper plasma welding with filler wire process parameters.The optimized welding parameters:welding current is 200 210 A,plasma gas flow is 3 L/min,welding speed is180 mm/min,wire feed speed is 900 1200 mm/min,the back of the argon flow is 15 L/min.The tensile strength of the welded joint is significantly improved.The tensile strength of the welded joint reach 333 MPa and it is 97.6% of that of the base metal.By the microstructure observation,it found that the microstructure of the weld is compact,and the grain is fine.Plasma welding with filler wire can provide an efficient method for realizing the welding of N6 nickel alloy plate.