Research On Key Technologies Of Laser Welding

Laser welding is one of the welding technologies, which use the focused laser beam to heat the welding position of the workpiece. Since the1960s, with the birth of CO2, YAG and other lasers, the field of materials processing has been greatly expanded such as laser drilling, laser welding and laser cutting. Laser welding has many superior features compared with traditional welding methods, for example, having larger melting area per unit time, high welding efficiency, a high degree of automation and relatively uniform welding positions, which makes the welding appearance be more exquisite and clean.This paper describes the background of laser welding technology, development status, characteristics and application prospects. The configuration of optical fiber laser is studied and experiment has been conducted on thin metal sheet. A stable narrowband2.26W continuous-wave Yb3+-doped fiber laser incorporating a fiber Bragg grating fabricated in a single mode photosensitive fiber was demonstrated. The laser featured excellent SNR of60dB, slope efficiency of64%, as well as a very narrow linewidth (0.0395nm). Several factors which affect the welding experiment is analyzed, and corresponding measures have been put forward to improve welding efficiency. Through setting up one Gaussian model of the distribution of the welding point, the2-D and3-D temperature are studied in detail. Then, the current welding technologies used in Jinan boiler group are listed and the potential technology reform will rely on laser welding in the future. Finally, the other applications of laser welding in other areas are discussed.