Temperature measurement of laser arc hybrid welding plasma

Abstract

Recently laser arc hybrid process is actively researched as a new heat source of welding. Laser arc hybrid welding is combination of laser characterized by the high energy density and electric arc characterized by the high energy efficiency. Metal is vaporized by irradiation of high power laser and this laser induced metal vapor makes path of electron because it has lower ionization energy than argon. Therefore the laser irradiation affects on temperature distribution of arc plasma. In this paper, measurement method of temperature of laser arc hybrid welding plasma is introduced and the effect of laser on the arc plasma is observed. For real-time measurement intensity distribution of plasma is obtained by CCD and abel inversion is accomplished for conversion from two dimensional data to three dimensional one. As a result of observation, plasma is concentrated by the laser and high temperature region is generated above the laser irradiated area.Recently laser arc hybrid process is actively researched as a new heat source of welding. Laser arc hybrid welding is combination of laser characterized by the high energy density and electric arc characterized by the high energy efficiency. Metal is vaporized by irradiation of high power laser and this laser induced metal vapor makes path of electron because it has lower ionization energy than argon. Therefore the laser irradiation affects on temperature distribution of arc plasma. In this paper, measurement method of temperature of laser arc hybrid welding plasma is introduced and the effect of laser on the arc plasma is observed. For real-time measurement intensity distribution of plasma is obtained by CCD and abel inversion is accomplished for conversion from two dimensional data to three dimensional one. As a result of observation, plasma is concentrated by the laser and high temperature region is generated above the laser irradiated area.