| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a laser beam welding method capable of improving welding quality at an end part by preventing generation of wire remaining unmelted at the end part and adhesion of a wire with another after welding in a method of executing laser beam welding while feeding a filler wire. SOLUTION: In an end part of laser beam welding of a working piece 8 by laser beam 3, velocity of feeding a filler supplied to a focus position of the laser beam 3 from a torch 12 is gradually decreased to zero. At the same time as the starting of decrease of the velocity of feeding a filler, a position of focus of the laser beam 3 is gradually separated from an end part of the working piece 8. Thereby, with the decrease of volume of key hole at the end part, the amount of melting metal is decreased and the key hole nearly disappears, and at the same time adhesion of excessive melting metal is prevented, and thus an end part treatment of high quality is executed.</p> |
