JP-2026075470-A - Laser welding equipment

Abstract

[Problem] To enable smooth melting of filler wire in laser filler welding. [Solution] During laser filler welding, the laser head 10 changes the emission position of the laser beam LB relative to the tip of the filler wire WA and performs a scanning operation along the emission trajectory SD which has a convex portion 30 that extends in a direction intersecting the welding direction WD and is convex in the direction opposite to the welding direction WD. [Selection Diagram] Figure 5

Inventors

• 王 静波
• 西尾 正敏
• 大角 敏裕
• 石井 佑哉
• 高橋 渉
• 吉村 秀行
• 柴田 憲三
• 山本 敦樹

Assignees

• パナソニックＩＰマネジメント株式会社

Dates

Publication Date

20260508

Application Date

20241022

Claims (4)

1. A laser welding apparatus comprising: a wire feeding unit for feeding a filler wire toward a workpiece; a laser head for emitting laser light toward the tip of the filler wire to laser filler weld the workpiece; and a manipulator for moving the laser head along a predetermined welding direction, An emission position changing unit that performs a scanning operation to change the emission position of the laser beam relative to the tip of the filler wire, A laser welding apparatus comprising: a control unit that controls the operation of the ejection position changing unit so as to perform the scanning operation along an ejection trajectory having a convex portion that extends in a direction intersecting the welding direction and is convex in the direction opposite to the welding direction during the laser filler welding.
2. In the laser welding apparatus according to claim 1, The aforementioned emission trajectory is a laser welding apparatus having a plurality of the aforementioned protrusions.
3. In the laser welding apparatus according to claim 1 or 2, The aforementioned workpiece is made of 2000 series, 6000 series, or 7000 series aluminum alloy. The aforementioned filler wire is a laser welding device made of 4000 series aluminum alloy.
4. In the laser welding apparatus according to claim 1 or 2, The control unit controls the operation of the emission position changing unit so that the scan speed during the scan operation remains constant.

Description

This invention relates to a laser welding apparatus. Patent Document 1 discloses a welding method in which metal plates are butt-joined by laser welding while a filler wire is added to the gap between the metal plates. In Patent Document 1, the laser beam moves along the gap between the metal plates while oscillating across the gap. As the laser beam moves, the wire supply unit activates, and the supply of filler wire to the gap begins, from the front to the rear in the welding direction. Japanese Patent Publication No. 2022-077544 This is a schematic diagram of the laser welding apparatus according to this first embodiment.This is a side view illustrating the arrangement of the laser beam and the filler wire.This is a plan view illustrating the emission trajectory of a laser beam.This is a plan view showing a magnified view of the laser beam's emission trajectory.This diagram shows the coordinates along the launch trajectory.This graph shows the relationship between the angle when plotting a Lissajous waveform, the coordinates, and the scan speed.This graph shows the relationship between the angle, coordinates, and scan speed when drawing the Lissajous waveform in this second embodiment.This is a plan view showing an enlarged view of the laser beam emission trajectory in this third embodiment.This diagram shows the coordinates along the launch trajectory.This graph shows the relationship between the angle when plotting a Lissajous waveform, the coordinates, and the scan speed.This graph shows the relationship between the angle, coordinates, and scan speed when drawing the Lissajous waveform in this fourth embodiment.This figure shows the launch trajectory when n = 8.This figure shows the launch trajectory when n = 16.This figure shows the launch trajectory when n = 32. The embodiments of the present invention will be described below with reference to the drawings. The following description of preferred embodiments is essentially illustrative and is not intended to limit the present invention, its applications, or its uses. In each figure, the X, Y, and Z directions are indicated by arrows. Unless otherwise specified, these directions will be described in accordance with the directions indicated by these arrows. Embodiment 1 As shown in Figure 1, the laser welding apparatus 1 includes a laser oscillator 2, a transmission fiber 3, a manipulator 6, a control unit 7, a laser head 10, and a wire feeding unit 25. The laser oscillator 2 oscillates laser light LB based on commands from the control unit 7. The input end of the transmission fiber 3 is connected to the laser oscillator 2. The output end of the transmission fiber 3 is connected to the laser head 10. The laser light LB is transmitted from the laser oscillator 2 to the laser head 10 via the transmission fiber 3. The wire feeding unit 25 includes a pair of feeding rollers 27 and a wire nozzle 28. The feeding rollers 27 are rotated by a feeding motor (not shown). The feeding rollers 27 feed the filler wire WA for welding. Note that multiple pairs of feeding rollers 27 may be provided. The wire nozzle 28 is supported by the laser head 10 via the support portion 29. The wire nozzle 28 guides the filler wire WA toward the welding point of the workpiece WK. The manipulator 6 has multiple arms. The laser head 10 is attached to the tip of one of the manipulator 6's arms. Based on commands from the control unit 7, the manipulator 6 moves the laser head 10 relative to the workpiece WK. The control unit 7 controls the operation of the laser oscillator 2, the manipulator 6, the laser head 10, and the wire feeding unit 25. In addition to controlling the movement speed of the laser head 10 by the manipulator 6, the control unit 7 also has functions to control the start and stop of the laser beam LB output, and the output intensity of the laser beam LB. The control unit 7 also controls the operation of the laser head 10's output position changing unit 15, which will be described later. Furthermore, although not shown in the diagram, the operation of the laser head 10's emission position changing unit 15 may be controlled by a dedicated control unit independent of the control unit 7. In this case, the control unit 7 transmits various conditions such as the operation parameters, laser output, and operation timing of the emission position changing unit 15 to the independent dedicated control unit. The laser head 10 emits the laser beam LB generated by the laser oscillator 2 onto the workpiece WK. Inside the laser head 10 are a collimating lens 11, a reflective mirror 12, a focusing lens 13, and an emission position changing unit 15. The collimating lens 11 parallelizes the laser beam LB incident on the laser head 10 via the transmission fiber 3. The reflective mirror 12 reflects the laser beam LB, which has been parallelized by the collimating lens 11, toward the focusing lens 13. The focusing lens 13 focuses the laser beam LB. The laser beam LB focused by the focusing l