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Laser welding methods and laser welding equipment

Through the light detection technology in the laser welding device, the laser irradiation control is adjusted to solve the problem of unstable energy absorption time in laser welding, realize an efficient and low-cost welding process, and ensure the uniform melting state of metal parts.

Inactive Publication Date: 2020-04-17
HONDA MOTOR CO LTD
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Problems solved by technology

In addition, it is known that copper used as such an electrical conductor has a low laser absorption rate, and a large-capacity laser emitter is used in order to shorten the time until the laser light is absorbed, and pretreatment such as surface oxidation is performed to increase the laser absorption rate.

Method used

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Embodiment Construction

[0038] Preferred embodiments of the present invention will be described below with reference to the drawings. figure 1 It is a figure which schematically shows the unit structure of the laser welding apparatus 1 which concerns on one Embodiment of this invention. The laser welding device 1 of the present embodiment performs a laser welding method of joining at least two electrical conductors 40 by laser welding.

[0039] Such as figure 1 As shown, the laser welding device 10 has: a laser head 11 that irradiates laser light (laser light) to an electrical conductor 40; an infrared sensor (light detection unit) 12 that detects infrared light; a visible light sensor (light detection unit) 13 that detects visible light; and The laser control unit 20 performs various controls of the laser welding device 10 .

[0040] The laser head 11 is a laser irradiation unit that irradiates an infrared laser beam to a workpiece to be welded. Laser light output from a laser oscillator (not s...

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Abstract

A laser welding method and a laser welding apparatus are provided, which can suppress the deviation of laser energy absorption time, thereby stably and efficiently supplying high-quality products. The laser welding method includes the following steps: irradiating the joint position of the electrical conductor (40) of the metal part to be welded with a laser head (11), detecting the reflected light of the laser from the joint position using an infrared sensor (12), or detecting the light emitted from the metal vapor using a visible light sensor (13); comparing the detection values ​​of the infrared sensor (12) and the visible light sensor (13) with the set values ​​to determine whether energy absorption has begun in the electrical conductor (40), and adjusting the laser irradiation control according to the time when energy absorption has begun.

Description

technical field [0001] The present invention relates to a laser welding method and a laser welding device for joining metal parts by laser welding. Background technique [0002] Conventionally, a technique of joining metal parts by laser welding is known. For example, Patent Document 1 discloses such a technique. Patent Document 1 discloses a method of manufacturing a rotating electrical machine: inserting each slot provided in a stator core, and joining the front ends of a plurality of electrical conductors protruding from each slot by laser welding, thereby manufacturing a rotating electrical machine. motor. Furthermore, it is known that copper used as such an electrical conductor has a low laser absorption rate, and a large-capacity laser emitter is used to shorten the time until the laser light is absorbed, and pretreatment such as surface oxidation is performed to increase the laser absorption rate. [0003] prior art literature [0004] patent documents [0005] P...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K26/21B23K26/70
CPCB23K26/21B23K26/702B23K26/032B23K26/22B23K2101/38B23K26/705B23K26/32B23K31/125
Owner HONDA MOTOR CO LTD
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