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Method for diagnosing galvanized steel laser powder addition welding defects on line based on characteristic spectrum

A welding defect and characteristic spectrum technology, applied in laser welding equipment, welding equipment, metal processing equipment, etc., can solve problems such as lack of research, achieve the effect of ensuring quality, solving welding defect problems, and avoiding pores

Inactive Publication Date: 2012-08-01
HUNAN UNIV
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Problems solved by technology

[0004] The above studies have used a variety of methods to detect the welding conditions of the welding process. However, no relevant research has been done on the special welding defects-porosity that occurs in the laser powder-filled welding process of galvanized steel, and the laser powder-filled welding cannot be well realized. The purpose of real-time monitoring and ensuring the quality of powder filling welding

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  • Method for diagnosing galvanized steel laser powder addition welding defects on line based on characteristic spectrum
  • Method for diagnosing galvanized steel laser powder addition welding defects on line based on characteristic spectrum
  • Method for diagnosing galvanized steel laser powder addition welding defects on line based on characteristic spectrum

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Embodiment Construction

[0021] Such as figure 1 As shown, the on-line diagnosis device for welding defects according to an embodiment of the present invention includes a workbench and a galvanized steel 1 fixed on the workbench. Focusing mirror, welding head 2 is fixed with galvanized steel laser powder feeder 7 (model: wi77544, IGS-3, IGS-3X, etc.), and galvanized steel 1 is equipped with laser beam imaging Lens 10, a single-wavelength photodetector assembly composed of a filter 11 (center wavelength 324.8nm) and a photodetector 4 (silicon photodiode), the single-wavelength photodetector is connected to a plasma for storing and displaying collection through an optical fiber The computer 5 of the volume light signal is connected, and the computer 5 is connected with the laser 6 (DC025 type slat type CO2 laser).

[0022] Such as figure 1 and 2 As shown, the way of adding powder is to add powder in advance or to feed powder synchronously. figure 2 In the shown synchronous powder feeding mode, the ...

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Abstract

The invention discloses a method for diagnosing galvanized steel laser powder addition welding defects on line based on a characteristic spectrum. In order to solve the problem that various welding defects of welding seam air hole, dents and the like are easy to generate in the welding process because a zinc layer can be easily gasified to form a large amount of zinc steam in the galvanized steel laser welding process, the welding defects in the galvanized steel laser powder addition welding process are detected in real time through the intensity of a spectral line CuI 324.8nm in the welding process on the basis of preventing the zinc steam from being generated by adding copper powder; and simultaneously, the welding process is controlled by automatically adjusting process parameters, so that welding air holes are prevented from being formed. By the method, the aim of monitoring a laser powder addition welding process in real time is fulfilled, the powder addition welding quality is ensured, and a great significance is provided for actual production.

Description

technical field [0001] The invention relates to the field of on-line monitoring of welding defects in the laser welding process, in particular to an on-line monitoring method for welding defects in the process of laser powder-added welding of galvanized steel based on the intensity of the spectral line Cu I 324.8nm. Background technique [0002] Domestically, Guo Jing of Tsinghua University and others used an axial optical sensor to collect coaxial photoplasma optical signals to achieve laser welding penetration detection. The study found that when the thickness of the plate is constant, the intensity of the coaxial optical signal increases with the increase of the line energy. The corresponding relationship between the frequency center of the coaxial optical signal and the laser power is just the opposite; Duan Aiqin of Huazhong University of Science and Technology, Hu Lunji and others compared the blue-violet light signal of the photoinduced plasma that accompanied the lase...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/03B23K26/32B23K26/323
Inventor 张屹史如坤段林勇
Owner HUNAN UNIV
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