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Resistance spot welding nugget nucleation dynamic quality nondestructive testing method

A resistance spot welding and non-destructive testing technology, applied in measuring devices, material analysis using acoustic wave emission technology, instruments, etc., can solve the problems that the nugget nucleation process cannot be directly observed and the quality of resistance spot welding is difficult to judge. , to achieve the effect of low design and manufacturing cost, high reliability and easy realization

Active Publication Date: 2012-09-05
JIANGSU MENSCH AUTO PARTS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the process of resistance spot welding, the nucleation process of nugget cannot be directly observed, which makes it difficult to judge the quality of resistance spot welding joints

Method used

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  • Resistance spot welding nugget nucleation dynamic quality nondestructive testing method
  • Resistance spot welding nugget nucleation dynamic quality nondestructive testing method
  • Resistance spot welding nugget nucleation dynamic quality nondestructive testing method

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Embodiment 1: The workpiece to be welded is the overlapping joint of two 2024 aluminum alloy sheet structures with a thickness of 1 mm. The main welding process parameters used are: welding current is 22000A, welding current duration is 6 cycles, electrode pressure is 0.14MPa. Welding is performed, and 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. The different stages of the welding process can be identified from the waveform diagram, and the structure-loaded AE signals of the three stages of electrode loading stage 1, nugget nucleation stage 2, and crack generation stage 3 are extracted, as shown in figure 2 , image 3 and Figure 4 shown. The ringing numbers R of electrode loading stage 1 and nuclei nucleation stage 2 in the signal are counted separately F , R N and ...

Embodiment 2

[0050] Embodiment 2: The workpiece to be welded is the overlapping joint of two 2024 aluminum alloy sheet structures with a thickness of 1 mm. The main welding process parameters used are: welding current is 24000A, welding current duration is 8 cycles, and electrode pressure is 0.14MPa. Welding is performed, and 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 6 shown. The different stages of the welding process can be identified from the waveform diagram, and the structure-loaded AE signals of the three stages of electrode loading stage 1, nugget nucleation stage 2, and crack generation stage 3 are extracted, as shown in Figure 7 , Figure 8 and Figure 9 shown. The ringing numbers R of electrode loading stage 1 and nuclei nucleation stage 2 in the signal are counted separately F , R ...

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Abstract

The invention discloses a resistance spot welding nugget nucleation dynamic quality nondestructive testing method which comprises the following steps of: acquiring the structure load acoustic emission signal in the resistance spot welding process, and drawing a dynamic curve chart; extracting the acoustic emission signals of the electrode loading stage, nugget nucleation stage and crack generation stage from the dynamic curve; counting the ringing number and total energy of the acoustic emission signals respectively; splitting the resistance spot welding sample nugget, and measuring the diameter, height and crack length of the actual nugget; establishing a sample pair to form a training set; establishing a nugget size artificial neural network and a crack length artificial neural network respectively, and training the obtained sample by use of the Back Propagation neural network algorithm; and applying the trained model to the real-time detection of the nugget size and the crack generation. According to the invention, online testing of the quality of multiple common resistance spot welding nuggets of metal structure material can be realized relatively accurately.

Description

technical field [0001] The invention relates to a non-destructive detection method for nucleation nucleation dynamic quality of resistance spot welding, which is suitable for resistance spot welding quality detection 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 prediction during welding are of great significance for improving production efficiency and optimizing production processes. However, in the process of resistance spot welding, the nucleation process of nugget cannot be directly observed, which makes it difficult to judge the quality of resistance spot welding joints. Therefore, the acquisition of resistance spot welding nugg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/14G01B17/00
Inventor 罗怡
Owner JIANGSU MENSCH AUTO PARTS
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