Experimental investigation of hot-wire laser deposition for the additive manufacturing of titanium parts

Abstract

The hot-wire laser welding is additive manufacturing (AM) technique, complex parts can be created directly by melting layers of wire. This process is characterized by the use of hot-wire process, a combination with the laser welding (LW) process in the AM process. In this research, the experimental investigation of additive manufacturing using a hot-wire laser welding on titanium alloy (grade 2) parts. The parameters in the hot-wire laser process of which there are three: (1) the welding speed, (2) wire current, and (3) wire feeding speed; this research examined the porosities, microhardness, tensile stress, and residual stress. The filler metal used titanium AMS (American welding society) 4951F (grade 2) welding wire and has a diameter of 1.6 mm. Finally, the appropriate hot wire laser welding parameters are 0.183 cm/s for welding speed, 40 A for wire current, and 1.00 m/min for wire feeding speed, which will give the average Vicker microhardness of 321.00-345.80 HV, the average tensile strength of 432.02 MPa (substrate); 670.30 MPa (horizontal direction), 497.39 MPa (Vertical direction).