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Test method for welding spot quality of resistance spot welding based on dynamic resistance curve

A technology of dynamic resistance curve and dynamic resistance, which is applied in the field of on-line quality inspection at the production site, can solve the problems of inability to guarantee the quality and reliability of untested products, low efficiency, and increased production costs, and achieves simple evaluation methods, low misjudgment rates, easy-to-achieve effects

Active Publication Date: 2015-06-24
CHONGQING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Such a detection method is not only inefficient, but also increases production costs, and cannot guarantee the quality and reliability of untested products.

Method used

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  • Test method for welding spot quality of resistance spot welding based on dynamic resistance curve
  • Test method for welding spot quality of resistance spot welding based on dynamic resistance curve
  • Test method for welding spot quality of resistance spot welding based on dynamic resistance curve

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Embodiment 1: First, to make standard dynamic resistance curves of different materials with different thicknesses, the method is as follows:

[0052] (1) Select two welded samples of low-carbon steel sheet structure with a thickness of 1mm for lap joint. The main welding process parameters used are: the welding current is 5500A, the welding current duration is 0.28s, and the electrode pressure is 0.15MPa;

[0053] (1) Real-time acquisition of the welding current signal and the electrode voltage signal of the resistance spot welding process in the secondary circuit of the resistance spot welding machine during the welding process;

[0054] (2) draw out the signal waveform of welding current and electrode voltage changing with time in the computer system;

[0055] (3) Use the computer system to divide the electrode voltage signal and the welding current signal waveform, and then draw the standard dynamic resistance curve of the solder joint formation process, such as fi...

Embodiment 2

[0057] Embodiment 2: Quality detection of resistance spot welding solder joints on low carbon steel plates with a thickness of 1 mm

[0058] The workpiece to be welded is a lap joint of two low-carbon steel sheet structures with a thickness of 1mm. The main welding process parameters used are: welding current 2000A, welding current duration 0.28s, electrode pressure 0.15MPa.

[0059] During welding, the welding current signal and electrode voltage signal of the resistance spot welding process are collected in real time, and the signal waveform diagram is drawn by the analysis software, as shown in figure 2 with image 3 shown. Then the dynamic resistance change curve of the solder joint formation process is obtained, such as Figure 4 shown.

[0060] Will Figure 4 Dynamic resistance curve vs. figure 1 Compared with the standard dynamic resistance curve shown, it can be seen that Figure 4 The dynamic resistance curve shown has only an initial phase of unstable nucleati...

Embodiment 3

[0062] Embodiment 3: Quality detection of resistance spot welding solder joints of low carbon steel materials with a thickness of 1 mm

[0063] The workpiece to be welded is the overlapping joint of two low-carbon steel sheet structures with a thickness of 1 mm. The main welding process parameters used are: welding current is 3500A, welding current duration is 0.28s, electrode pressure is 0.15MPa.

[0064] During welding, the welding current signal and electrode voltage signal of the resistance spot welding process are collected in real time, and the signal waveform diagram is drawn by the analysis software, as shown in Image 6 with Figure 7 shown. Then the dynamic resistance change curve of the solder joint formation process is obtained, such as Figure 8 shown.

[0065] Will Figure 8 Dynamic resistance curve vs. figure 1 Compared with the standard dynamic resistance curve shown, it can be seen that Figure 8 The dynamic resistance curve shown consists only of the i...

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Abstract

The invention discloses a test method for welding spot quality of resistance spot welding based on dynamic resistance curve. The method comprises the following steps: calculating dynamic resistance changing curve and average dynamic resistance according to a welding current signal, an electrode voltage signal and welding current duration detected during the welding process of resistance spot welding in real time, further drawing a relation curve based on the calculated average dynamic resistance and the welding spot diameter and welding spot maximum bearing capacity obtained by destructive detection on corresponding welding spot, and thereby building an average dynamic resistance-welding spot diameter mathematical model and an average dynamic resistance-welding spot maximum bearing capacity mathematical model; in actual welding process, comparing the detected dynamic resistance curve with a standard dynamic resistance curve to judge nucleation situation of the welding spot; and calling corresponding mathematical model from a database, inputting the detected average dynamic resistance, calculating and outputting a diameter value and a maximum bearing capacity value of the welding spot by a computer, if the output values are less than corresponding given thresholds, judging that the welding spot is unqualified. By the test method provided by the invention, non-destructive detection and evaluation on diameter and maximum bearing capacity of the welding spot of resistance spot welding can be realized quickly, and the test method is particularly suitable for on-line quality detection in the welding production field.

Description

technical field [0001] The invention relates to a resistance spot welding solder joint quality detection technology, which is suitable for the solder joint quality evaluation of commonly used metal thin plate structural materials, and is especially suitable for the on-line quality detection at the production site. Background technique [0002] Resistance spot welding is a welding method widely used in automobile manufacturing, and has been widely used in the welding of metal structures of modern passenger cars. Therefore, the detection of the quality of resistance spot welding solder joints is very important. Efficient sensing and detection and evaluation of solder joint quality during the welding process is of great significance for improving production efficiency and welding quality, and saving production costs. However, in the process of resistance spot welding, the formation of solder joints is hidden in the workpiece and cannot be directly observed, which brings difficu...

Claims

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Application Information

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IPC IPC(8): G01N27/00
Inventor 罗怡刘伟樊红军段钰婷章璇高飞
Owner CHONGQING UNIV OF TECH
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