Study on process parameter of high performance laser cutting machine tool for copper sheet
A high performance NC laser cutting machine tool for copper sheet is designed, emphasis discussing the components of NC laser cutting machine tool and design points. Performance of high power semiconductor pulse micro-cutting of copper sheet is studied and several key parameters are given by changing assistant gas and process parameters. The experimental results show that the best cutting quality can be obtained when argon is used as assistant gas, and oxygen is on the contrary. Also, in a certain range, improving laser power and cutting speed can help in decreasing laser cutting gap, minishing heat affected area, and achieving better cutting quality.
Laser welding of aluminum alloys: from fundamental investigation to industrial application
Laser beam welding of aluminum alloys is rendered difficult by their specific material properties. On the other hand the productivity and quality of the laser process is very attractive for the manufacturing of light-weight constructions for e.g. all kinds of vehicles. In many years of research a fundamental understanding of the relevant technological and metallurgical mechanisms has been acquired. This allows to offer guidelines for a successful adaptation of the welding process to specific needs of applications. Factors relevant for deep penetration threshold, process efficiency, process stability and for minimizing metallurgical defects are discussed. Strength values of butt and overlap joints are presented. The results achieved allows us to recommend the laser technique for near-to-production investigations and series application, today.
Laser welding of different aluminum alloys
Laser welding is one of the most common methods for joining steel. Its application to the welding of aluminum alloys has been studied in recent years (Ref. 1-7), but a practical technique for use in production operations has yet to be devised. The main reason for this is the low degree of energy efficiency that is obtained because of the high reflectivity and high thermal conductivity of aluminum alloys. Compared with steel, it is reported that the welding of aluminum alloys requires twice the laser power density. In addition, the additives contained in aluminum alloys strongly affect their weldability. For these reasons, it is difficult to optimize laser welding conditions.Laser welding is one of the most common methods for joining steel. Its application to the welding of aluminum alloys has been studied in recent years (Ref. 1-7), but a practical technique for use in production operations has yet to be devised. The main reason for this is the low degree of energy efficiency that is obtained because of the high reflectivity and high thermal conductivity of aluminum alloys. Compared with steel, it is reported that the welding of aluminum alloys requires twice the laser power density. In addition, the additives contained in aluminum alloys strongly affect their weldability. For these reasons, it is difficult to optimize laser welding conditions.