Online detection method for laser deep penetration welding defects and detection device

A technology of laser deep penetration welding and detection method, which is applied in the direction of laser welding equipment, welding equipment, metal processing equipment, etc., can solve the problems that the accuracy and robustness are difficult to meet, and does not consider the complexity of the small hole contour structure, etc., to achieve Effect of improving accuracy and robustness, reducing time and cost, increasing accuracy

Pending Publication Date: 2020-12-04
SHANGHAI INST OF LASER TECH
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Problems solved by technology

This method does not consider the complexity of the small hole profile structure, and the accuracy and robustness are difficult to meet the requirements of actual detection

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  • Online detection method for laser deep penetration welding defects and detection device
  • Online detection method for laser deep penetration welding defects and detection device
  • Online detection method for laser deep penetration welding defects and detection device

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Embodiment Construction

[0041] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. According to the following description, the purpose, technical solution and advantages of the present invention will be more clear. It should be noted that the described embodiments are preferred embodiments of the present invention, but not all embodiments.

[0042] An online detection method for laser deep penetration welding defects, comprising the following steps:

[0043] S1. During the welding process, through the imaging system, the images formed during welding such as figure 1 Real-time extraction and storage of the contour images of the molten pool small hole B and the penetration hole C shown;

[0044] S2. By collecting welding images of different types of welding defects, extracting their contour features to form different data sets, calculating the curvature descriptor of the boundary contour as a feature of welding qualit...

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Abstract

The invention relates to an online detection method for laser deep penetration welding defects. In the welding process, an imaging system is used for extracting and storing shape contour images of small holes and penetrating holes in a molten pool formed in the welding process in real time, and on the basis of a pre-trained relation model between contour features of the images of the small holes and the penetrating holes and the fusion welding defects, on-line detection of the optical fiber laser welding quality is achieved. Establishment of a relation model between the contour features of theimages of the small holes and the penetrating holes and the welding quality is based on detection of a large amount of sample data, and training of feature data of the small holes and the penetratingholes is carried out by using a hidden Markov process. The invention further relates to a detection device applied to the online detection method. According to the online detection method and device,online defect detection and quality analysis in the optical fiber laser welding process are achieved, various defects possibly influencing the welding quality can be found conveniently in the weldingprocess, and the time and cost of later manual detection or X-ray detection are reduced.

Description

technical field [0001] The invention relates to the technical field of laser deep penetration welding defect detection, in particular to an online detection method and detection device for laser deep penetration welding defects. Background technique [0002] As one of the most ideal heat sources for high-speed deep penetration welding, laser is developing rapidly in industrial processing and modern intelligent manufacturing. Laser welding is one of the important aspects of the application of laser material processing technology. Compared with arc welding, the advantage of laser welding is that a small spot can be obtained after the laser beam is focused by the lens, so as to accurately locate the welding position. As an efficient and precise welding method, it has been widely used in the welding process of precision workpieces. In addition, it also has the advantages of large depth and width, high energy density, welding of heterogeneous materials and easy control. However...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/21B23K26/14B23K26/064B23K26/70
CPCB23K26/14B23K26/064B23K26/21B23K26/702
Inventor 张玲玲汤信钟平顾俊刘钊鹏张杰
Owner SHANGHAI INST OF LASER TECH
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