抄録
The full-scale use of lasers in the steel industry began nearly 23 years ago with their applications as controllable light sources. Its contribution to the increase in efficiency and quality of the steel making process has been important and brought us the saving of the energy, the resource and the labor. Laser applications in the steel making process generally require high input energy, so it is essential to consider the interaction between the laser beam and the irradiated material. We have developed plenty of new high-power-laser applications for the steel making process with their considerations in mind. A review of the following high-power-laser applications is given in the present paper: (1) Wedge shape welding with multiple reflecting effectof CO2 laser beam, (2) Butt welding of extra thin steel sheets by ripple mode Nd-YAG laser, (3) Developed laser flying welder connect hot bars of around 1100 °C for continuous hot rolling mill using two 45 kW CO2 lasers.
