Method and system for measuring surface tension of liquid metal in welding pool in real time
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A technology of liquid metal and surface tension, applied in surface tension analysis, measuring devices, surface/boundary effects, etc., can solve problems such as difficult real-time measurement of surface tension, and achieve high sampling rate, good application prospects, and high signal-to-noise ratio Effect
Active Publication Date: 2021-06-25
LANZHOU UNIVERSITY OF TECHNOLOGY
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[0004] The object of the present invention is to provide a method and system for real-time measurement of the surface tension of the liquid metal in the welding pool, aiming at solving t...
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Embodiment 1
[0052] The embodiment of the invention discloses a method for real-time measurement of the surface tension of the liquid metal in the welding pool, such as figure 1 As shown, the method includes the following steps:
[0053] S1. Real-time projection of the laser stripes reflected by the emitted beam of the laser on the surface of the molten pool that produces the oscillation phenomenon of the molten pool; obtaining the change of the laser stripes; measuring the temperature field image of the molten pool at the moment of arc extinction;
[0054] In step S1, the emitted light beam is adjustable five-line fringe and single-line fringe. The laser stripes are reflected behind the surface of the pool, and the laser stripes can be displayed in real time through projection processing, and the changes of the laser stripes can be obtained by obtaining the projected images displayed in real time. In the actual application process, the laser stripes are projected on the imaging screen, a...
Embodiment 2
[0080] A system for real-time measurement of the surface tension of the liquid metal in the weld pool, such as image 3 As shown, the system includes a parameter acquisition unit, a parameter processing unit and a surface tension calculation unit; wherein,
[0081] The parameter acquisition unit includes an imaging screen 1, an infrared thermometer 2, a high-speed camera 3 and a laser 4; wherein,
[0082] The laser 4 is used to emit a five-line or single-line structured beam;
[0083] The imaging screen 1 is used to project in real time the laser stripes reflected by the emitted light beam of the laser 4 irradiating the surface of the molten pool 5 that produces the molten pool oscillation phenomenon;
[0084] The high-speed camera 3 is used to obtain the changes of the laser stripes on the imaging screen 1;
[0085] The infrared thermometer 2 is used to measure the temperature field image of the melting pool at the moment of arc extinction;
[0086] The parameter processin...
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Abstract
The invention discloses a method and system for measuring the surface tension of liquid metal in a welding pool in real time. According to the method, the method comprises the steps of: projecting laser stripes reflected after light beams emitted by a laser irradiate the surface of a molten pool generating a molten pool oscillation phenomenon in real time, and obtaining the change condition of the laser stripes; measuring a molten pool temperature field image at the arc quenching moment; converting the laser stripe change condition into a molten pool oscillation time domain signal, and performing fast Fourier transform on the time domain signal to extract the molten pool oscillation frequency; according to a molten pool temperature field in the image, obtaining the average temperature of the surface of the molten pool under the temperature field, and calibrating and measuring the width of a metal melting point isotherm in the image to extract the front width of the molten pool; and substituting the molten pool oscillation frequency, the average temperature of the molten pool surface and the front width of the molten pool into the model to obtain the surface tension of the liquid metal of the welding pool at the current moment. According to the method, the surface tension value better fitting the reality can be obtained according to different welding conditions, the sampling rate is high, the signal-to-noise ratio is high, and equipment is simple.
Description
technical field [0001] The invention belongs to the technical field of welding process detection, in particular to a method and system for real-time measuring the surface tension of liquid metal in a welding pool. Background technique [0002] The surface tension of the liquid metal in the welding pool has a very important influence on the solidification and crystallization of the metal in the molten pool and the quality of the weld seam. Under actual welding conditions, due to the influence of many factors such as welding process parameters, workpiece heat dissipation conditions and heat accumulation, The value of surface tension changes at any time. Due to the interference of light, electricity, magnetism and heat in the welding process, it has been very difficult to measure the surface tension in real time under actual welding conditions for a long time. [0003] At present, the measurement methods for the surface tension of high-temperature liquid metals are mainly conc...
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