Laser welding method for variable-thickness part

A technology of laser welding and variable thickness, which is applied in the direction of laser welding equipment, welding equipment, welding/welding/cutting items, etc., to ensure the quality of weld seams, avoid laser welding defects, and improve production efficiency and pass rate.

Inactive Publication Date: 2020-03-06
AVIC BEIJING AERONAUTICAL MFG TECH RES INST
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Problems solved by technology

[0005] The embodiment of the present invention provides a laser welding method for parts with variable thickness. By adjusting the input power of the laser during the welding process, the technical problem of welding defects caused

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  • Laser welding method for variable-thickness part
  • Laser welding method for variable-thickness part
  • Laser welding method for variable-thickness part

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[0045] Example

[0046] see Figure 4 , in this embodiment, the variable thickness parts are described by taking TC4 titanium alloy superplastic forming / diffusion joining parts as an example, and the thickness changes are as follows Figure 4 As shown, based on the digital model of the part, the welding edge data is extracted as follows: A 0 A 1 The length of the welding side of the segment is 0.2m, the thickness is 2mm, A 1 A 2 The segment length is 0.05m, the thickness is 1mm, A 2 A 3 The segment length is 0.06m, the thickness is 2mm, A 3 A 4 The segment length is 0.06m, the thickness is 1mm, A 4 A 5 The segment length is 1.2m and the thickness is 2mm.

[0047] It should be further clarified that the laser used in the laser welding method described in this embodiment is a high-power fiber laser, a YAG laser or a disk laser.

[0048] Specifically, in this embodiment, the laser welding method adopts the welding shielding gas as argon or helium. It can be understood t...

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Abstract

The invention discloses a laser welding method for a variable-thickness part. The method comprises the following steps of extracting a welding length and a welding edge thickness of each section of awelding edge; taking a welding starting point as an origin and a welding direction as a positive direction of an X axis, and establishing a functional relationship between the welding edge thickness and the welding length; establishing a functional relationship between the welding edge thickness and welding time; establishing a functional relationship between welding heat input and the welding time; establishing a functional relationship between welding input power and the welding time; and controlling the change of the welding input power in the welding direction to weld the variable-thickness part. According to the method, on the basis of the characteristics of the variable-thickness part and the welding process requirement, the input power of a laser in the laser welding process is controlled through functions under the constant welding speed, so it is guaranteed that the input power and the welding edge thickness are accurately matched, the welding seam quality in the welding process is stable, the production efficiency and the qualification rate are improved, and then the problem of the laser welding defect, caused by the change of the welding edge thickness, of the variable-thickness part is fundamentally solved.

Description

technical field [0001] The invention relates to the technical field of laser welding processing, in particular to a laser welding method for parts with variable thickness. Background technique [0002] Laser welding technology has become the latest advanced welding technology with its unique advantages of large aspect ratio, small weld width, small heat-affected zone, small deformation, fast welding speed, good weld quality and easy automation. This technology is highly valued in aerospace and other fields, so it develops rapidly and plays a very important role, and is known as one of the advanced manufacturing technologies in the 21st century. Titanium alloy materials have the advantages of high specific stiffness and high specific strength, and have been widely used in aerospace large-scale superplastic thin-walled structures. While ensuring the rigidity and strength of parts, they can effectively reduce the weight of the aircraft itself. However, due to the large size of...

Claims

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Application Information

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IPC IPC(8): B23K26/21B23K26/14
CPCB23K26/14B23K26/21B23K2103/14
Inventor 何恩光陈俐王彬赵晓龙
Owner AVIC BEIJING AERONAUTICAL MFG TECH RES INST
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