Patent ID: 8344283
Filing Date: 2013-01-01
Classification: B23K

Abstract:
1. A laser arc hybrid welding head for fillet-welding or butt-welding aluminum steel sheets by performing laser light irradiation and arc discharge, thereby combining laser welding and arc welding, comprising: a laser torch for irradiating the aluminum steel sheets with inputted laser light while focusing the inputted laser light on the aluminum steel sheets to diffuse an aluminum vapor in a plasma state from a position of laser irradiation onto the aluminum steel sheets, and to form a keyhole at the position of laser irradiation; an arc electrode, consisting essentially of aluminum and provided coaxially with an optical axis of the laser light applied for irradiation and focused by the laser torch, for generating an arc between the arc electrode and the aluminum steel sheets; and arc control means for controlling a transfer mode of a welding droplet from the arc electrode to be spray transfer to hold a range from a leading end portion of the arc electrode to the keyhole in an aluminum vapor atmosphere.