Method for quantitatively detecting welding spatter by utilizing acoustic emission signal energy equivalent of resistance spot welding process

A technology of acoustic emission signal and welding spatter, which is applied in the field of rapid detection of resistance spot welding quality, can solve the problems of lack of quantitative detection and evaluation methods, difficulty in detecting the quality of resistance spot welding solder joints, etc., and achieve low design and manufacturing costs and an evaluation method Simple, easy-to-achieve effects

Active Publication Date: 2014-01-01
CHONGQING UNIV OF TECH
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  • Abstract
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  • Application Information

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Problems solved by technology

However, in the process of resistance spot welding, the nucleation process of the nugget cannot be directly observed, which makes it difficult to judge the influence of welding spatter and then detect the quality of resistance spot welding joints
Especially for welding spatter, a common phenomenon in the nugget nucleation process, there has been a lack of reliable quantitative detection and evaluation methods for a long time

Method used

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  • Method for quantitatively detecting welding spatter by utilizing acoustic emission signal energy equivalent of resistance spot welding process
  • Method for quantitatively detecting welding spatter by utilizing acoustic emission signal energy equivalent of resistance spot welding process
  • Method for quantitatively detecting welding spatter by utilizing acoustic emission signal energy equivalent of resistance spot welding process

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Effect test

Embodiment 1

[0036] The workpiece to be welded is the overlapping joint of two galvanized steel sheet structures with a thickness of 1 mm. The main welding process parameters used are: welding current is 10000A, welding current duration is 8 cycles, and electrode pressure is 0.15MPa.

[0037] During welding, the structural load acoustic emission signal of the resistance spot welding process is collected in real time, and the dynamic curve of the structural load acoustic emission signal is drawn by the analysis software, as shown in figure 1 shown.

[0038] Different stages of the welding process can be identified from the waveform diagram, and the welding spatter signal 1 can be extracted, such as figure 2 shown. It can be seen that the mode of the welding spatter is a welding spatter event of a single acoustic emission event.

[0039] Statistics the amplitude distribution of welding spatter acoustic emission signal pulse. According to the distribution, the magnitude is divided into 10 ...

Embodiment 2

[0044] The workpiece to be welded is the overlapping joint of two galvanized steel sheet structures with a thickness of 1 mm. The main welding process parameters used are: welding current is 11000A, welding current duration is 8 cycles, and electrode pressure is 0.15MPa.

[0045] During welding, the structural load acoustic emission signal of the resistance spot welding process is collected in real time, and the dynamic curve of the structural load acoustic emission signal is drawn by the analysis software, as shown in Figure 4 shown.

[0046] Different stages of the welding process can be identified from the waveform diagram, and the welding spatter signal 1 can be extracted, such as Figure 5 shown. It can be seen that the welding spattering mode is a welding spattering event composed of two acoustic emission events.

[0047] Statistics the amplitude distribution of welding spatter acoustic emission signal pulse. According to the distribution, the magnitude is divided i...

Embodiment 3

[0052] The workpiece to be welded is the overlapping joint of two galvanized steel sheet structures with a thickness of 1mm. The main welding process parameters used are: welding current is 10000A, welding current duration is 8 cycles, and electrode pressure is 0.15MPa.

[0053] During welding, the structural load acoustic emission signal of the resistance spot welding process is collected in real time, and the dynamic curve of the structural load acoustic emission signal is drawn by the analysis software, as shown in Figure 7 shown.

[0054] Different stages of the welding process can be identified from the waveform diagram, and the welding spatter signal 1 can be extracted, such as Figure 8 shown. It can be seen that the weld spatter pattern is a weld spatter event composed of three acoustic emission events.

[0055] Statistics the amplitude distribution of welding spatter acoustic emission signal pulse. According to the distribution, the magnitude is divided into 10 g...

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Abstract

The invention discloses a method for quantitatively detecting welding spatter by utilizing the acoustic emission signal energy equivalent of a resistance spot welding process. The method comprises the steps of collecting a structural load acoustic emission signal of the resistance spot welding process in real time, and drawing a dynamic oscillogram; extracting the acoustic emission signal of the welding spatter; counting the amplitude distribution of signal pulses; classing the amplitude into a plurality of grades Mi, and respectively accumulating according to the ringing count Ni of the acoustic emission signals exceeding the amplitude grades; taking an X axis as an amplitude grade value Mi and Y axis as a log value log10Ni of acoustic emission signal ringing count, accumulated according to the acoustic emission signals exceeding the amplitude grades Mi, to obtain a spattering distribution diagram; performing linear fitting; according to a right-angled triangle formed by the fit line and the X axis and the Y axis, calculating the area of the triangle, which is the energy equivalent of the welding spatter in the corresponding resistance spot welding process. The higher the equivalent value is, the greater the welding spatter is, namely that the larger the influence of the welding spatter on the molten core quality is. According to the method, the size grade and mode of the welding spatter can be accurately and quantitatively evaluated, and the fast, accurate and quantitative detection on the welding spatter of the resistance spot welding can be realized.

Description

technical field [0001] The invention relates to a detection method for quantitatively evaluating welding spatter by using the acoustic emission signal energy equivalent of the resistance spot welding process obtained by real-time detection, which is suitable for rapid detection of the resistance spot welding quality of commonly used metal thin plate structural materials. Background technique [0002] Resistance spot welding is a welding method widely used in automobile manufacturing. There are about 3000-6000 resistance spot welding spots on a modern car. Therefore, the detection of the quality of resistance spot welding solder joints is very important. High-efficiency solder joint quality sensing and its detection and evaluation during the welding process are of great significance for optimizing the production process, improving production efficiency and welding quality. Welding spatter is a common phenomenon in resistance spot welding of metal materials. It is caused by th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H17/00B23K11/25
Inventor 罗怡
Owner CHONGQING UNIV OF TECH
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