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Real-time monitoring system and monitoring method for judging welding type of laser deep penetration welding by using high-speed camera

A real-time monitoring system, laser deep penetration welding technology, applied in the direction of laser welding equipment, welding equipment, metal processing equipment, etc., can solve the problem that the workpiece cannot be judged intuitively, and achieve the effect of advanced and accurate

Inactive Publication Date: 2016-04-06
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the traditional welding process observation method cannot intuitively judge whether the workpiece is penetrating deep penetration welding, and propose a real-time monitoring system and monitoring method that uses a high-speed camera to judge the type of laser deep penetration welding

Method used

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  • Real-time monitoring system and monitoring method for judging welding type of laser deep penetration welding by using high-speed camera
  • Real-time monitoring system and monitoring method for judging welding type of laser deep penetration welding by using high-speed camera
  • Real-time monitoring system and monitoring method for judging welding type of laser deep penetration welding by using high-speed camera

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specific Embodiment approach 1

[0029] Specific implementation mode one: combine figure 1 Describe this embodiment, a real-time monitoring system that uses a high-speed camera to determine the type of laser deep penetration welding described in this embodiment, it includes an image acquisition card 2, a camera 3, a zoom lens 4, a filter system 5, two focusing Mirror 6, dichroic mirror 7, laser emitter 8 and dichroic mirror fixing frame 10;

[0030] The video signal input end of the image acquisition card 2 is connected to the video signal output end of the camera 3;

[0031] The information output end of image acquisition card 2 is connected to the information input end of PC 1; Utilize image acquisition card 2 to gather the image signal that camera 3 shoots to PC 1, save in the hard disk of PC 1 with the form of data file;

[0032] The camera 3 is used to collect images of the welding process during the laser deep penetration welding stabilization process;

[0033] The zoom lens 4 is fixed on the lens of ...

specific Embodiment approach 2

[0038] Specific implementation mode two: combination Figure 2 to Figure 9 This embodiment is described. This embodiment is based on the monitoring method of a real-time monitoring system that uses a high-speed camera to determine the type of laser deep penetration welding described in the first embodiment. The method includes the following steps:

[0039] Step 1, start the real-time monitoring system and PC 1, after the welding process is stable, the camera 3 performs image acquisition on the welding process;

[0040] Step 2, using the PC 1 to preprocess the images collected by the camera 3;

[0041] Step 3, judge whether it is penetrating deep penetration welding according to the appearance of the keyhole and molten pool of the preprocessed image in step 2;

[0042] Penetrating deep penetration welding means that the weld seam is completely penetrated by the keyhole. The form of penetrating deep penetration welding in the image is: the shape of the keyhole is two circles, t...

specific Embodiment approach 3

[0045] Specific embodiment three: this embodiment is to explain the monitoring method of a real-time monitoring system that uses a high-speed camera to determine the type of laser deep penetration welding described in specific embodiment two. In this embodiment, PC 1 The method of preprocessing the image collected by camera 3 is as follows:

[0046] Method A: Median smoothing filter to remove noise;

[0047] Method B: homomorphic filtering;

[0048] Method C: Linear grayscale transformation image enhancement.

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Abstract

The invention discloses a real-time monitoring system and a monitoring method for judging a welding type of laser deep penetration welding by using a high-speed camera, relates to the field of detection of laser deep penetration welding technology, and aims to solve the problem of incapability of directly judging if workpieces use deep penetration welding in a traditional welding process observation method. An image acquisition card is used for acquiring image signals shot by the camera to a PC; after the welding process is stabilized through the PC, the camera acquires images in the welding process; then, the PC is used for preprocessing the images acquired by the camera; and finally, the deep penetration welding is judged according to morphology of key holes and molten pools in the images preprocessed in the step 2. The real-time monitoring system and monitoring method have the following beneficial effects: the monitoring method of the real-time monitoring system for judging the welding type of laser deep penetration welding by using the high-speed camera has higher advancement and accuracy, and is suitable for detecting of the laser deep penetration welding technology.

Description

technical field [0001] The invention relates to the detection field of laser deep penetration welding technology. Background technique [0002] Due to its concentrated heat source, fast welding speed, small deformation of the workpiece after welding, and high degree of automation, laser welding is more and more widely used in industrial production. In the actual welding process, full penetration is the most important welding mode. [0003] In laser deep penetration welding, since the keyhole and the surrounding molten metal are always in a high-speed and complex movement, using various sensing devices to obtain information during the welding process is also an important means of studying the welding process. In traditional research, for the detection of the full penetration welding process, it is usually realized by placing a sensor on the back, such as using a photodiode to detect the radiation from the plasma sprayed on the back or using a temperature sensor to obtain the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/03
CPCB23K26/032
Inventor 李俐群陶汪夏鸿博
Owner HARBIN INST OF TECH
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