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Laser spot welding monitoring method and monitoring device

A laser spot welding and spot welding technology, which is applied in laser welding equipment, welding equipment, metal processing equipment, etc., can solve the problems of high cost and inability to fully reflect the quality of laser spot welding, and achieve the effect of fast speed and cost reduction

Active Publication Date: 2014-10-01
THE HONG KONG POLYTECHNIC UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a laser spot welding monitoring method and monitoring system to overcome the defects of the high cost of the existing laser spot welding monitoring technology and the inability to fully reflect the quality of the laser spot welding

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  • Laser spot welding monitoring method and monitoring device

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Embodiment Construction

[0054] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0055] figure 1 , Fig. 2 is the working flow diagram of the laser spot welding monitoring method of the present invention, respectively corresponding to the monitoring in the spot welding process and the monitoring after the spot welding ends. It should be noted that the monitoring during the spot welding process and the monitoring after the spot welding only represent the time when the two monitoring signals are generated. In actual work, the two monitoring methods are carried out synchronously with the entire spot welding.

[0056] figure 1 It is a flow chart of monitoring during spot welding. When laser spot welding is working, a strong laser is irradiated on the welding sample to generate a molten pool, and signals will be radiated from the molten pool. The present invention first collects these radiated signals, band-pass filters the ...

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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.

Description

technical field [0001] The invention relates to laser spot welding technology, more specifically, to a laser spot welding monitoring method and monitoring device. Background technique [0002] Laser spot welding is a new type of welding technology. The surface of the object to be welded is heated by a continuous or pulsed laser beam. The surface heat diffuses to the interior through heat conduction, and then melts the object to be welded to form a weld pool. Weld the object to be welded to other objects. (Please confirm whether it is correct) During the spot welding process, the quality of the formed molten pool needs to be monitored. The existing monitoring method is to shoot the molten pool through a high-speed camera (shooting speed is above 200,000 frames per second), and then pass Image processing to determine the quality of melt pool formation. However, this method requires the use of high-cost high-speed cameras; in addition, using this method to only analyze the re...

Claims

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Application Information

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IPC IPC(8): B23K26/70B23K26/22
CPCB23K26/22B23K26/702
Inventor 文效忠卢光铨陈清远郑嘉庆
Owner THE HONG KONG POLYTECHNIC UNIV
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