Method for synchronously detecting image-electric signals during welding process
A welding process and electrical signal technology, applied in the direction of measuring electricity, welding equipment, welding accessories, etc., can solve the problem of more accurate analysis, can not be synchronized, etc., to achieve the effect of accurate analysis
Inactive Publication Date: 2017-01-04
TIANJIN UNIV
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[0004] However, during the welding process, the electrical signal acquisition process and the image signal acquisition process cannot be synchronized
This limits more precise analysis of both signals, resulting in more reliable analysis results
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[0013] In the image capture system, the interference of the tail flame arc is eliminated by adding a filter, so that the liquid surface of the molten pool can be seen clearly. In order to obtain a complete and clear image of the small hole, an exhaust flame detection board can be installed at the bottom of the small hole on the back of the workpiece, and the position of the detection board can be adjusted to allow the camera to have a suitable viewing angle. In the welding process, the same welding process parameters are used to realize the penetration hole welding. Design a reliable small hole edge algorithm to extract the small hole edge. After calibrating the camera parameters, the actual size and center offset of the small hole can be calculated from the small hole pixel value in the image. In order to start the acquisition process of electrical parameter signal and image at the same time, the synchronization method adopted is: when the welding arc starting process starts,...
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The invention relates to a method for synchronously detecting image-electric signals during welding process. The method is characterized in that during the welding process, an image acquisition card is utilized to acquire image information of the welding process; a data acquisition card is utilized to acquire electric signals of the welding process; when the welding arcing process starts, a trigger signal is applied to trigger the image acquisition card and the data acquisition card to start the acquisition process at the same time; when a welding transferred arc is lit, a welding machine arcing signal skips from a low value to a high value; the signal can be adopted as a trigger judgment signal; and an external trigger signal acquired by a camera is a TTL pulse falling edge signal. According to the method, the version sensing sequence and electric signal measurement sequence during the welding process can be unified.
Description
technical field [0001] The invention belongs to the technical field of welding, and relates to a method for unifying the timing of visual sensing and electrical signal measurement in the welding process. Background technique [0002] The electrical signal in the welding process contains a wealth of information. It not only contains information about the performance of the welding power source, but also includes information about the welding quality, such as: core size, shape of the molten pool, penetration status, droplet transfer frequency and shape, etc. The detection of electrical signals in the welding process is of great significance to ensure the smooth progress of the welding process and the quality of the welded joints. The development of microcomputer and sensing technology makes it possible to use microcomputer to collect welding power voltage and current signals at high speed; at the same time, it is also possible to use microcomputer to process the signal in real...
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IPC IPC(8): B23K9/067B23K9/32G01R31/40G01R31/00
CPCB23K9/067B23K9/32G01R31/00G01R31/40
Inventor 刘祖明曹佳威刘婷罗震邱嘉玉刘知易
Owner TIANJIN UNIV