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Flexible Switching Method of Laser Deep Penetration Welding and Laser Modification Welding

A deep penetration welding and laser welding technology, applied in laser welding equipment, welding equipment, metal processing equipment, etc., can solve the problems of low welding efficiency and poor effect, achieve high production efficiency, simplify switching process adjustment, improve laser Effects of modifying welding quality

Active Publication Date: 2021-04-13
AVIC BEIJING AERONAUTICAL MFG TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 of Laser Deep Penetration Welding and Laser Modification Welding
  • Flexible Switching Method of Laser Deep Penetration Welding and Laser Modification Welding
  • Flexible Switching Method of Laser Deep Penetration Welding and Laser Modification Welding

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Embodiment 1

[0040] Embodiment 1: see figure 2 and 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 dee...

Embodiment 2

[0046] Example 2: see figure 2 , Figure 4 , Figure 5 and Figure 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 50 mm.

[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 p...

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Abstract

The invention relates to a flexible switching method for laser deep penetration welding and laser modification welding. The method is characterized in that after the laser deep penetration welding is completed and before laser modification welding, a diffractive optical lens is inserted between the focusing lens and the anti-splash lens on the laser welding processing head, so that the focused beam originally focused on the welding plane passes through the After the diffractive optical lens, the shape of the spot and the energy distribution of the beam are changed, and the height of the laser welding processing head and the welding plane remains unchanged. stay consistent. It not only replans the shape and energy distribution mode of the laser beam, further improves the quality of laser decoration welding, but also realizes the flexible switching between laser deep penetration welding and laser decoration welding under the premise of keeping the welding height unchanged. The method has the advantages of high degree of automation, convenience and quickness, high quality of 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 Patents(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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