Effects of Process Parameters on Temperature and Residual Stress in Laser Welding of Beryllium Cylindrical Shells

摘要

For improving success rate of the Beryllium (Be) product welding, it is necessary to study the effects of process parameters of laser welding on the temperature and residual stress distribution. This paper, using numerical simulations, investigates the effects of three technical parameters, laser power, spot radius and spot offset, on temperature and residual stress distribution in Be cylindrical shells. According to the results, the conclusions are drawn that a welding can be effective only if the welding power is higher than 400W, the laser spot radius less than 1.4mm and the offset of the spot center less than 1.3mm; the maximum residual stress increases with increasing laser power, decreasing laser spot radius or offset of the laser spot center, but the effects are not significant. These conclusions provide guidelines for improving laser welding process of Be materials.