Wavelet analysis-based resistance spot welding plastic ring imaging method and application thereof
A technology of resistance spot welding and wavelet analysis, which is applied in the analysis of solids, instruments, and calculations using sonic/ultrasonic/infrasonic waves. Deviation from metallographic analysis, inability to accurately distinguish plastic ring regions, etc., to achieve the effect of easy observation, rapid imaging, and accurate acquisition
Pending Publication Date: 2022-04-26
江苏金晟元控制技术有限公司
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Problems solved by technology
Ultrasonic measurement is one of the important technologies for on-line detection of nugget size. The existing ultrasonic detection method cannot accurately distinguish the plastic ring area, which leads to deviations between the measurement data of the spot welding nugget diameter and the metallographic analysis, and it is difficult to form an accurate and reliable Spot Welding Nugget Diameter On-Line Measurement Technology
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[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0032] see Figure 1-6 , the present invention provides the following technical solutions: a wavelet analysis-based resistance spot welding plastic ring imaging method, using the wavelet analysis method to obtain the resistance spot welding plastic ring area:
[0033] Firstly, perform layered ultrasonic imaging on resistance spot welding to obtain A-scan signals and C-scan images;
[0034] Then wavelet decomposes the A-scan signal into approximate coefficient...
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The invention relates to the technical field of resistance spot welding ultrasonic detection, in particular to a resistance spot welding plastic ring imaging method based on wavelet analysis and application thereof.The resistance spot welding plastic ring imaging method based on wavelet analysis obtains a resistance spot welding plastic ring area through the wavelet analysis method and comprises the steps that firstly, layered ultrasonic imaging is conducted on resistance spot welding, and an A scanning signal and a C scanning image are obtained; performing wavelet decomposition on the A scanning signal to decompose the A scanning signal into an approximation coefficient and a detail coefficient; correcting the approximation coefficient according to a semi-soft threshold function to obtain a corrected approximation coefficient; then A scanning signal reconstruction is carried out by using the detail coefficient and the corrected approximation coefficient; and finally, spot welding C scanning imaging is carried out according to the A scanning signal. The spot welding plastic ring area can be rapidly and accurately obtained and visually displayed in an imaging mode, and the measurement results of the spot welding nugget and the plastic ring are easy to observe. Rapid imaging of the plastic ring is achieved, and the measurement precision of spot welding nugget size ultrasonic detection is improved.
Description
technical field [0001] The invention relates to the technical field of resistance spot welding ultrasonic detection, in particular to a wavelet analysis-based imaging method for resistance spot welding plastic rings and its application. Background technique [0002] Resistance spot welding has the characteristics of high efficiency, reliable quality, low cost, easy operation and easy realization of welding automation. It is widely used in the field of automobile manufacturing. The number of welding points is as high as 3000-6000. The welding quality of spot welding directly affects the welding structure of the car body. Therefore, accurate evaluation of spot welding welding quality is an important prerequisite to ensure the safety of welded structures. The nugget size of resistance spot welding is one of the important parameters to measure the welding quality of spot welding. The measurement of the nugget size is closely related to the accurate distinction of the plastic rin...
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Login to View More IPC IPC(8): G06K9/00G01N29/04
CPCG01N29/04G06F2218/06
Inventor 张博毛金根
Owner 江苏金晟元控制技术有限公司