| 摘要 |
<p>PROBLEM TO BE SOLVED: To surely prevent a weld imperfection within the weld bead by detecting a butting position of plank materials, thickness of which are different, before the welding and calculating a discrepancy value between the welding point and the butting position and, then by driving a welding head in a direction to eliminate the discrepancy value. SOLUTION: When the laser welding head 1 starts to weld, while displacing its position in a shaft Y direction on a given welding line as instructed by a driving part 5, a butting position determining part 4 determines a pre-welding butting position C. On the other hand, a bead shape determining part 6 detects a center part of the welding bead 12 and determines if the welding is good or bad based on the shape of the bead 12. An amendment value calculation part 7 calculates a discrepancy value of the position C and the laser beam center line based on a difference between the position C determined by the position determine part 4 and the center part determined by the shape determination part 6. When the discrepancy value is within a given value, the driving head 1 is driven by the amendment value obtained on the basis of the discrepancy value to shift the center line position in a shaft X direction so that the center line matches the position C.</p> |
