Distance and beam splitting energy adjustable three-light-spot laser welding optical system

Abstract

The invention discloses a three-spot laser welding optical system with adjustable spacing and splitting energy. The invention has a novel structural design, and adopts a combination of a circular wedge mirror and a three-beam splitting prism, based on the beam caused by the adjustable spacing of the double circular wedge mirror. Translational characteristics, based on the beam splitting characteristics and edge angle characteristics of the double-chip three-beam splitting prism, and based on the rotation characteristics of the central axis of the circular wedge mirror and the three-beam splitting prism, a focusing three-spot optical system is realized. The three-spot spacing, energy and direction All can be adjusted, suitable for fiber laser laser welding applications with any fiber core diameter, especially helpful to improve the weld seam quality of welded parts in laser brazing.

Description

Technical field: [0001] The invention relates to the field of laser welding, in particular to a three-spot laser welding optical system with adjustable spacing and light splitting energy. Background technique: [0002] The industrial laser processing industry includes laser cutting, welding, marking, drilling, micromachining, cladding, quenching, surface treatment, 3D printing, etc., covering laser processing of various commonly used metal or non-metal materials, especially Laser welding, marking, 3D printing and other laser processing industries have more representative requirements for laser beam diversity. [0003] Laser welding, from the initial single-focus welding, to the later derived bi-focus welding, tri-focus welding, etc., aims to obtain better welding effect and quality. Bi-focus welding is a process in which the laser beam is specially shaped to focus two beams of the same energy and the same size, which fall symmetrically on both sides of the weld for processi...

AI Technical Summary

Problems solved by technology

The former scheme, the optical fiber laser splitting scheme represented by IPG, the direction of the three light spots after focusing through the conventional external optical path is often random, and there are many restrictions on the direction of laser welding, and the high-power special optical fiber is very expensive. The light splitting energy of the three spots and the distance between the spots are not adjustable; for the latter plan, there is a splitting plan represented by Laserline, through arraying and splitting the surface of the lens, the main spot is square, and the side double spot is circular. Three light spots, the problem with this solution is that the distance between the three light spots is fixed, which greatly affects and limits the application of laser welding with large differences in fiber core diameters and large differences in the focal length of focusing mirrors. Furthermore, arrayed mirrors are very difficult to process. The cost is expensive, and currently only a few foreign suppliers have stable products

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