Double-beam laser welding optimization method

A technology of laser welding and optimization methods, applied in laser welding equipment, welding equipment, metal processing equipment, etc., can solve the problems of ineffective guidance of welding process application, large adjustability of double-beam laser, and difficulty in grasping welding process. , to achieve the effect of improving welding quality and efficiency, good filling and balance, and uniform sample distribution

Active Publication Date: 2020-01-03
WENZHOU UNIVERSITY
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Problems solved by technology

Compared with single laser, dual-beam laser is more adjustable, and some laser process parameters are added, including spot spacing, energy ratio and arrangement, etc., so the process becomes much more complicated
However, the current mechanism of double-beam laser research is not very mature, it is difficult to grasp the relationship between welding process parameters and weld quality, and cannot effectively guide the application of welding process

Method used

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Embodiment Construction

[0017] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0018] refer to Figure 1 to Figure 3 , a double-beam laser welding optimization method, comprising the following steps:

[0019] S1. Sampling: The optimal Latin hypercube is used to sample the test samples, and the laser power, welding speed, defocus and spot spacing are selected as the influencing factors of the process parameters, among which the laser power is 1200-2000w, the welding speed is 25-35mm / s, The defocus amount is 2-8mm, and the spot distance is 0.3-0.9mm. The sampling data are shown in Table 1 below.

[0020] S2. Simulation: Use the finite volume method software FLUENT to perform numerical simulation of the molten pool flow of dissimilar metals under different process parameters in step S1, in which the double-rotating Gaussian heat source model is used to represent the double-beam laser heat source, and the udf and the corresponding boundar...

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Abstract

The invention discloses a double-beam laser welding optimization method. Finite volume method analysis software FLUENT is adopted to conduct numerical simulation on weld pool flow characteristics during welding of dissimilar metal, and thus a temperature cloud chart, the weld width and the weld depth can be obtained; then the three-dimensional shape and the hole size in the dissimilar metal can beobtained through an X-ray computed tomography technology; an optimal Latin hypercube design-response surface method is adopted to conduct optimization design on laser welding, and thus a mapping relationship among laser technological parameters, weld pool characteristics and weld joint characteristics is established; and the double-beam laser welding optimization method specifically comprises thefollowing steps of S1, sampling, S2, analogue simulation, S3, information scanning, S4, response surface relation graph, S5, predicting model, and S6, weld joint optimizing. The double-beam laser welding optimization method has the following advantages and effects that sampling distribution is uniform, the predicting model is accurate, the predicting model is mainly applied to weld joint qualityoptimizing and guiding of laser technological parameter selection, guidance is provided for people lack of experience, and the welding efficiency and the weld joint quality can be improved.

Description

technical field [0001] The invention relates to the field of laser welding, in particular to an optimization method for double-beam laser welding. Background technique [0002] Compared with other fusion welding technologies, laser welding technology has obvious advantages in welding precision and efficiency, and has been widely used in automotive, aerospace and other industrial fields. However, in practical applications, it is found that the single-focus laser has certain limitations, such as small spot size, high energy density, violent fluctuations at the keyhole of the molten pool, and a large number of pores generated, resulting in poor weld quality. Studies have shown that the dual-beam laser can solve these problems very well and can greatly improve the stability of welding. Compared with the single laser, the double-beam laser is more adjustable, and some laser process parameters have been added, including spot spacing, energy ratio and arrangement, etc., so the pro...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/21
CPCB23K26/21
Inventor 周建锡谢锡贵仲召杰
Owner WENZHOU UNIVERSITY
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