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Real-time detection method for resistance spot welding quality based on electrode displacement fluctuation

A real-time detection, resistance spot welding technology, applied in resistance welding equipment, measuring devices, welding equipment and other directions, can solve the problems of non-pre-detection, large amount of information, low efficiency, etc., to improve accuracy, achieve closed-loop control, speed quick effect

Inactive Publication Date: 2012-09-05
SHANGHAI JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method detects the quality of spot welding by comparing the collected electrode displacement curve with the standard electrode displacement curve, but it needs to use the tolerance zone in the quality detection of solder joints, which requires a large amount of information and low efficiency, and can only be used for final analysis. The quality of solder joints is judged, and pre-testing cannot be performed during the welding process

Method used

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  • Real-time detection method for resistance spot welding quality based on electrode displacement fluctuation
  • Real-time detection method for resistance spot welding quality based on electrode displacement fluctuation
  • Real-time detection method for resistance spot welding quality based on electrode displacement fluctuation

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Embodiment 1

[0032] In this example, low-carbon steel with a thickness of 1mm is taken as an example, and lap resistance welding is performed on a fixed AC spot welding machine. According to the low-carbon steel A-type spot welding specification recommended by the US RWMA, the welding conditions are: frustum-shaped electrode , the diameter of the electrode tip is 5mm, the welding current is 8.8kA, the electrode pressure is 225kg, and the welding time is 10 cycles. The specific steps are:

[0033] The first step is to measure the electrode displacement by using the HEIDENHAIN-SPECT0 grating displacement sensor of the German HEIDENHAIN company, and obtain the real-time displacement signal of the separation of the upper and lower electrodes during the spot welding process, that is, the electrode displacement information.

[0034] In the second step, the obtained electrode displacement information is transmitted to the industrial computer, and the industrial computer performs data collection, a...

Embodiment 2

[0050] The difference between this embodiment and embodiment 1 is: the sequence number of the first feature point of the solder joint to be detected is 1, and the peak value of the displacement fluctuation is 39.5um; the sequence number of the second feature point is 3, and the peak value of the displacement fluctuation is 26.5um um; the sequence number of the third feature point is 5, and the displacement peak value is 39.5um; the sequence number of the fourth feature point is 33, and the displacement peak value is 9um.

[0051] The electrode displacement curve of this embodiment is as Figure 5 As shown, the electrode displacement curve of the solder joint to be detected suddenly drops due to splashing, and abnormal fluctuations occur, and the abnormal fluctuation of the electrode displacement curve increases the sequence number of the displacement fluctuation peak curve, which is greater than the threshold T (in this embodiment T=20 ), and its curve fluctuates abnormally af...

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Abstract

The invention discloses a real-time detection method for resistance spot welding quality based on electrode displacement fluctuation in the technical field of welding. The real-time detection method comprises the steps of: measuring electrode displacement by using a raster displacement sensor; carrying out data acquisition by using an industrial personal computer to obtain an electrode displacement curve, and extracting a displacement fluctuation peak value on the electrode displacement curve to obtain a displacement fluctuation peak value curve; calibrating and extracting the serial numbers and the displacement fluctuation peak values of four characteristic points on the displacement fluctuation peak value curve; and correspondingly providing one detection result of poor soldering, undersize nugget, qualification and welding splatter on the quality of the welding points by using the serial numbers and the displacement fluctuation peak values of the first characteristic point, the third characteristic point and the fourth characteristic point as real-time detection references. In the invention, all forming steps of the nugget are obtained through extracting displacement fluctuation peak values, a spot welding process becomes partially observable from completely unobservable, and the welding point quality is detected according to the characteristic points on the displacement fluctuation peak value curves, thus the detection method has fast detection speed and is beneficial to realizing real-time closed-loop control of the spot welding quality.

Description

technical field [0001] The invention relates to a method in the field of welding technology, in particular to a real-time detection method for resistance spot welding quality based on electrode displacement fluctuations. Background technique [0002] AC resistance spot welding is widely used in industrial production due to its advantages of high efficiency, low cost, and high degree of automation, but at the same time, it is difficult to monitor the welding quality because of the unobservable and instantaneous nature of the solder joint formation process. Among the monitored parameters of resistance spot welding studied, electrode displacement is considered to be one of the ideal parameters to reflect the quality of welding nugget because it can more intuitively reflect the change of thermal expansion displacement during the formation of nugget. Therefore, many researchers have developed a quality monitoring system for resistance spot welding based on electrode displacement....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/84G01B11/04B23K11/36
Inventor 孟国香王先锋李永兵谢文华冯正进
Owner SHANGHAI JIAOTONG UNIV
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