Laser welding method for double workpieces with large thickness

A technology of laser welding and two workpieces, applied in laser welding equipment, welding equipment, manufacturing tools, etc., to avoid large differences in melting point and simple welding

Inactive Publication Date: 2017-12-08
张家港市旭华激光有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem mainly solved by the present invention is to provide a laser welding method for double workpieces with large thickness, which can effectively weld two workpieces with a thickness exceeding 8 mm, and is easy to focus, effectively solving the defects of traditional welding

Method used

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Embodiment Construction

[0019] The preferred embodiments of the present invention are described in detail below, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, so as to define the protection scope of the present invention more clearly.

[0020] Embodiments of the invention include:

[0021] Described a kind of laser welding method of large-thickness double work piece, comprises the steps:

[0022] The first step: choose welding laser, choose CO2 laser, the beam of CO2 laser is far infrared light, the wavelength is 10.6Lm, most metals have a reflectivity of 80% to 90% for this light, and special light mirrors are needed to turn the beam Focusing into a diameter of 0.75-0.1mm, the CO2 laser power was kept at 20 000W.

[0023] Step 2: Set the laser controller, adjust the laser pulse width, energy, peak power and repetition frequency and other parameters through the laser controller, and connect and set the helium protective gas so...

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Abstract

The invention discloses a laser welding method for large-thickness double workpieces, which includes: selecting a welding laser, setting a laser controller, processing the workpieces, selecting a workpiece fixture, self-checking the first workpiece, and heat-treating the two workpieces. The welding part of the workpiece is butted, so that the laser head emits a laser beam to melt the workpiece to form a molten pool, set up a protective gas, and repeatedly control the laser controller to generate continuous laser light, annealing treatment, and blanking of the workpiece. The present invention is a large-thickness double workpiece The advanced laser welding method can effectively weld two metal materials, the welding is simple, and the defect of large difference in melting point can be avoided, and it can be widely used on plates of different strengths and materials.

Description

technical field [0001] The invention relates to the technical field of laser welding, in particular to a laser welding method for large-thickness double workpieces. Background technique [0002] Laser welding is an efficient and precise welding method that uses a high-energy-density laser beam as a heat source. Laser welding is one of the important aspects of the application of laser material processing technology. It has been used maturely in welding thin-walled materials, but for workpieces with large thickness, the surface heat cannot be quickly directed to the inside, so that the workpiece cannot be melted quickly, so welding is difficult, and If the thickness is too large, it is easy to increase the focus range of the laser beam, it is not easy to focus, the energy conversion efficiency is too low, and the processing time of the workpiece is lengthened, so that the welding part solidifies rapidly, and there are defects of pores and embrittlement. Contents of the inven...

Claims

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Application Information

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IPC IPC(8): B23K26/24B23K26/60
CPCB23K26/24B23K26/60
Inventor 孟燕
Owner 张家港市旭华激光有限公司
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