| 摘要 |
PURPOSE:To obtain a welded joint of excellent quality by measuring continuously a groove gap extending over the width direction and adjusting the filler wire feed rate in addition to the laser beam torch height and the laser beam torch traveling speed or the laser beam torch oscillator output based on this. CONSTITUTION:The cut surface 1a of a preceding steel strip 1 is abutted on the cut surface 2a of a succeeding steel strip 2 and while the laser beam torch 4 being traveled along a butt groove 3, a filler wire 5 is supplied to perform welding. In this case, the gap G of the butt groove 3 is measured in the width direction by a gap measuring instrument 6 and this measured result if brought in preset welding conditions and operation is carried out. The feed rate of the filler wire 5 in addition to the machining height of the laser beam torch 4 or the position of a condenser lens, namely, the distance from the condenser lens to the steel strips, the torch traveling speed, the laser beam oscillator output, etc., are then controlled to perform welding. |
