Effects of Laser Welding Parameters on the Characteristics of Deposition Layer

Abstract

Laser welding with filler wire makes welding more cost efficient due to its properties. However, fluctuation of welding parameters seriously affects the stability of welding process and the quality of deposition layer. Based on the high speed camera system and welding process test, this paper focuses on effects of welding parameters on the laser-wire coupling behavior, the transition behavior of molten metal and the characteristics of deposition layer. The results showed that the transition behaviors of liquid metal were decomposed into globular transition behavior, liquid-bridge transition behavior and spreading transition behavior, among which the liquid-bridge transition behavior was most stable relatively. Different dynamic welding processes in different circumstances were established to interpret the laser-wire coupling behaviors and the transition behaviors of liquid metal while the D was zero. It was found that the coupling behavior and the transition behavior of liquid metal belonged to different dynamic process with the variable welding parameters. The optimized welding parameters were obtained by analyzing the stability of welding process and the characteristics of deposition layer.