Robot based laser welding technology

In order to obtain a good result in the laser welding process, the laser welding technology for manufacturing ail automobile body is studied in this resea.rch. The monitoring of the welding quality and the seam tracking are studied to improve the productivity. The robot, the seam tracking system and CIA' Nd:YAG laser are used for the robot laser welding system. The laser system is 4kW Nd:YAG laser (HI.4006D) oj,-,rrLllnpf and the robot system is I.RB640OR of ABB. 'File robot laser welding system is equipped with the seam tracker and plasma;ensor. The seam tracking system is composed of SMART-20LS and RAPAL of Servo-Robot and IvIVS-5 sensor ofMVS. 'File precise positioning of the laser beam on thejoint to be assembled is obi:ained. by seam tracker. The welding joints of steel plate Eire butt and [ap joint. The three dimensional welding for non-linear tailored blank is performed after the fundamental experiments of bead-on-plate. Finally, the welding process for non-linear tailored blank and front side member is studied. The rnonitoring method of welding quality and seam tracking along the butt-joint are studied. The artificial defects in joint are well observed by the plasma intensity signal from the plasma sensor of U%1 and IR. The robot based laser welding system is developed for the precision seam tracking and the real-time monitoring of welding quality.