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Flexible switching method for laser deep penetration fusion welding and laser decorated welding

A deep penetration welding and laser welding technology, applied in laser welding equipment, welding equipment, metal processing equipment, etc., can solve problems such as poor effect and low welding efficiency, and achieve high production efficiency, high degree of automation, and flexible switching. Effect

Active Publication Date: 2019-07-02
AVIC BEIJING AERONAUTICAL MFG TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The embodiment of the present invention provides a flexible switching method for laser deep penetration welding and laser modification welding. By inserting a specific diffractive optical lens, the spot shape and beam energy distribution can be changed without changing the distance between the focusing lens and the welding plane. Under the premise of the premise, the flexible switching between the two modes of laser deep penetration welding and laser modification welding is realized, which solves the problems of low efficiency and poor effect of existing welding

Method used

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  • Flexible switching method for laser deep penetration fusion welding and laser decorated welding
  • Flexible switching method for laser deep penetration fusion welding and laser decorated welding
  • Flexible switching method for laser deep penetration fusion welding and laser decorated welding

Examples

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Effect test

Embodiment 1

[0040] Example 1: see figure 2 with image 3 , a diffractive optical lens designed with a concave spherical surface is used for flexible switching between laser deep penetration welding and laser finishing welding, including the following steps:

[0041] Step 1. Select a concave spherical diffractive optical lens 71 suitable for modifying the welding seam with a weld width of 2 mm to 3 mm. One side is a concave spherical surface, and the other side is a stepped or continuous relief structure. The concave spherical focal length of the concave spherical diffractive optical lens 71 is - 600mm.

[0042] Step 2. On the welding plane 5 of the metal structural parts, adopt the welding process parameters with a welding speed of not less than 6m / min, a laser power of not less than 4kW, and zero defocus. After the fiber laser deep penetration welding is completed, the weld surface is cleaned of welding spatter. In this step, the focal length of the focusing lens 2 during laser deep ...

Embodiment 2

[0046] Example 2: see figure 2 , Figure 4 , Figure 5 with Image 6 , using a double-cylindrical grooved diffractive optical lens for flexible switching between laser deep penetration welding and laser finishing welding, including the following steps:

[0047] Step 1. Select a diffractive optical lens 74 suitable for modifying the welding seam with a weld width of 5 mm to 6 mm. One side is a double-cylindrical groove, and the other side is a stepped or continuous relief structure. The radius R of the double-cylindrical surface is 600 mm, and the double-cylindrical The distance between the axes of the surfaces is 50mm.

[0048] Step 2. On the welding plane 5 of the metal structural parts, adopt welding process parameters with a welding speed of 1.0m / min to 2.0m / min, a laser power of 2kW to 3kW, and zero defocus. After the fiber laser deep penetration welding is completed, Remove weld spatter from weld surfaces. The focal length of the focusing lens 2 during laser deep pe...

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Abstract

The invention relates to a flexible switching method for laser deep penetration fusion welding and laser decorated welding. The method is characterized in that after the laser deep penetration weldingis completed, before the laser decorated welding is conducted, a diffractive optical lens is inserted between a focusing lens and an anti-spatter lens on a laser welded processing head, after passingthrough the diffractive optical lens, a focusing light beam originally focused on a welding flat surface can change the shape of a light spot and the energy distribution of the light beam, moreover,the height of laser welded processing head and the welding flat surface are kept to be unchanged, and a welding procedure, a welding path and a welding gas hood protection method of the laser decorated welding are consistent with those of laser deep penetration welding. The shape and the energy distribution mode of the laser light beam are re-planned, the quality of laser decorated welding is further improved, and on the premise of keeping the welding height unchanged, flexible switching between laser deep penetration welding and laser decorated welding can be achieved. The flexible switchingmethod has high automation, convenience and rapidity, high quality of a laser welding seam and high production efficiency.

Description

technical field [0001] The invention relates to the technical field of laser welding, in particular to a flexible switching method for laser deep penetration welding and laser modification welding. Background technique [0002] Laser welding has the characteristics of high energy density, low total heat input, fast welding speed, small thermal damage to materials, low residual stress of joints, and can work in atmospheric environment. It is especially suitable for thin-walled spaces in aerospace and other fields. Connection of complex surface structures. However, in the process of laser deep penetration welding, the surface of the weld often presents problems such as undercut, uneven fish scales, and poor surface formation. These weld surface problems not only seriously affect the quality of welded joints, but also weaken the fatigue service performance of welded structures to a certain extent. [0003] After the welding is completed, the laser modification welding of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/064B23K26/04B23K26/21
CPCB23K26/04B23K26/0648B23K26/064B23K26/21
Inventor 许飞陈俐曹子文邢一思
Owner AVIC BEIJING AERONAUTICAL MFG TECH RES INST
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