CONTROLLING METHOD FOR ASSISTING GAS EJECTION IN LASER BEAM WELDING DEVICE AND DEVICE THEREFOR

摘要

PURPOSE:To eject an assisting gas to a laser beam welded part at an effective angle. CONSTITUTION:The ejecting angle of the assisting gas to the laser beam welded part P from an assisting gas nozzle 43 can be changed according to a commanding signal from outside. The assisting gas ejecting angle theta is changed corresponding to the welding conditions such as the quality of a material to be welded, the thickness of a metal plate, the shape of a welded face, the strength of the laser beam and the welding speed.