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Title: Laser spot welding monitoring method and monitoring device
Other Titles: 激光点焊监测方法及监测装置
Authors: Wen, XZ 
Lo, KC 
Chan, CC 
Zheng, JQ 
Issue Date: 17-Feb-2016
Publisher: 中华人民共和国国家知识产权局
Source: 中国专利 ZL 201310099852.6 How to cite?
Abstract: The invention relates to a laser spot welding monitoring method and a monitoring device, wherein the laser spot welding monitoring method comprises the following steps: in the laser spot welding process, radiation signals of a molten bath are collected; the band-pass filtration is performed for the collected radiation signals to obtain band-pass signals; low-frequency direct-current components and high-frequency noise components in the radiation signals are removed; the fast Fourier transformation and the normalized power spectral transformation are performed for the band-pass signals to obtain molten bath characteristic signals; if the molten bath characteristic signals include spot welding characteristic frequency peaks, spot welding successful signals are output; and otherwise, spot welding unsuccessful signals are output. The laser spot welding monitoring method and the monitoring device can analyze the spot welding quality and determine if the laser power in the spot welding process is proper, have quick analysis speed and low cost, and can be preferably compatible with an existing laser spot welding technology.
Rights: 专利权人: The Hong Kong Polytechnic University.
Appears in Collections:Patent

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