A double-beam laser welding optimization method
A laser welding and optimization method technology, which is 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, difficulty in grasping welding process, etc. , to achieve the effect of improving welding quality and efficiency, good filling and balance, and uniform sample distribution
Active Publication Date: 2021-05-21
WENZHOU UNIV
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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
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[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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The invention discloses a dual-beam laser welding optimization method. The finite volume method analysis software FLUENT is used to numerically simulate the flow characteristics of molten pools during welding of dissimilar metals, and temperature cloud images, fusion widths and penetration depths can be obtained. The three-dimensional morphology and pore volume inside the dissimilar metal can be obtained by using X-ray computed tomography. Using the optimal Latin hypercube design-response surface method to optimize the design of laser welding, and establish the mapping relationship between laser process parameters, molten pool characteristics and weld seam characteristics, specifically including the following steps: S1, sampling, S2, simulation , S3, scan information, S4, response surface diagram, S5, prediction model, S6, optimized weld. The present invention has the following advantages and effects: the sampling distribution of the present invention is uniform, the prediction model is accurate, it is mainly used in the optimization of weld seam quality and the selection of guiding laser process parameters, it provides guidance for inexperienced people, and can improve welding efficiency and weld seam quality .
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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IPC IPC(8): B23K26/21
CPCB23K26/21
Inventor 周建锡谢锡贵仲召杰
Owner WENZHOU UNIV