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Self-focusing laser welding device

A laser welding and self-focusing technology, used in laser welding equipment, welding equipment, metal processing equipment, etc., can solve the problems of insufficient flexibility, easy damage to the focus spot of the focusing lens, and high cost of the lens group.

Inactive Publication Date: 2010-06-16
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under high-intensity pulsed laser irradiation, the focusing lens is easily damaged and the focal spot is large; and the cost of the lens group is high, the flexibility is not enough, and due to the thermal lens effect, the focusing point is easy to drift

Method used

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Embodiment Construction

[0016] Below in conjunction with accompanying drawing and embodiment example, the present invention will be further described:

[0017] See attached figure 1 , a self-focusing laser welding device, its structure is: a laser 1, a total reflection plate 2, an I-shaped bracket 3, a laser self-focusing tube 4 and a workbench 5. The laser is a Nd:YAG pulsed laser with a laser wavelength of 1062nm. The total reflection plate is a silver-plated high-reflection glass plate with a reflectivity of 99.99%. The I-shaped bracket is made of steel with a width of 3cm and a thickness of 5mm; The quartz incident window of the focusing tube has a thickness of 2 mm and a diameter of 2 cm; the diameter of the glass tube is 2 cm, the thickness of the tube wall is 1 mm, and the tube length is 2 cm; liquid CS is injected into the glass tube 2 , whose linear refractive index and nonlinear coefficient are respectively

[0018] no 0 =1.62,n 2 =1.3×10 -11 esu. At this time CS 2 The refractive ind...

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Abstract

The invention provides a self-focusing laser welding device, which belongs to the technical field of laser and in particular relates to the field of laser welding. Laser focusing in the self-focusing laser welding device does not need a conventional focusing lens or lens group, but is realized by utilizing the self-focusing effect of intense laser light in a highly-nonlinear medium. The self-focusing laser welding device aims to solve the technical problems of relatively higher cost, insufficient flexibility and easily drifting focus and the like in the conventional lens or lens group. The self-focusing laser welding device is characterized by consisting of a laser 1, a total reflection board 2, an I-shaped bracket 3, a laser self-focusing tube 4 and a workbench 5, wherein the intense laser light emitted by the laser is subjected to beam adjustment by a reflector panel plated with a highly-reflective coating and then vertically irradiates an incident window of the laser self-focusing tube to enter the laser self-focusing glass tube and be incident into liquid with a highly-nonlinear coefficient in the tube. Due to the highly-nonlinear effect of the liquid, the laser light is self-focused and is emitted from an emergent window when the intensity of the laser light is over a certain threshold. The device is suitable for the laser welding and application thereof.

Description

technical field [0001] The invention provides a self-focusing laser welding device, which belongs to the field of laser technology, and in particular relates to the field of laser welding. Background technique [0002] Laser welding has the advantages of fast welding speed, small heat-affected zone, refined weld structure, small welding deformation and strong adaptability, which can well meet the requirements of the automobile industry. It has been more and more widely used in recent years, and has The welding speed is fast, the aspect ratio is large, the thermal strain value at the weld is low, and the heat-affected zone is small; at the same time, the high energy required for welding is provided to the edge of the workpiece through the focusing of the laser beam, and the diameter of the focus point can reach a few tenths mm, retains the original formability of the material and can be formed in one piece. But its laser focusing mainly adopts lens or lens group to realize l...

Claims

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Application Information

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IPC IPC(8): B23K26/20B23K26/21
Inventor 沈常宇李可侯强龙
Owner CHINA JILIANG UNIV
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