Nondestructive testing device and method for automatic testing of sheet spot welding quality

Abstract

The invention discloses a nondestructive testing device for automatic testing of sheet spot welding quality. The nondestructive testing device comprises a control circuit, a coupling agent injection mechanism, at least one test probe mechanism and a quality assessment mechanism, wherein a coupling agent supply mechanism comprises a water tank, a water pump and an electromagnetic valve; the control circuit controls the water pump and the electromagnetic valve to be started and shut down, a port P of the electromagnetic valve is connected with the water pump, and the water pump is connected with the water tank which is connected with a port T of the electromagnetic valve; each test probe mechanism comprises a high-frequency ultrasonic probe and a probe cover, the probe cover is provided with a liquid inlet hole and a liquid outlet hole, the liquid inlet hole is connected with a port A of the electromagnetic valve, and the liquid outlet hole is connected with a port B of the electromagnetic valve; the quality assessment mechanism comprises an ultrasonic testing device and a computer, the ultrasonic testing device is connected with the high-frequency ultrasonic probe, and the computer is connected with the ultrasonic testing device. According to the nondestructive testing device, automatic online detection of the spot welding quality of large sheets can be realized.

Description

technical field [0001] The invention belongs to the field of ultrasonic emission technology, and in particular relates to a non-destructive testing method and device for automatically detecting the quality of thin plate spot welding. automatic detection. Background technique [0002] In the manufacturing process of automobile body, welding is the main joining process method, especially resistance spot welding. There are thousands of solder joints on the body of a finished car. The quality of these solder joints directly affects the quality of the car body and the performance of the vehicle. Ensuring the quality of spot welding is one of the main methods to improve the safety performance of the car. Therefore, the resistance The quality inspection of spot welding is of great significance. [0003] With the rapid development of on-line monitoring of spot welding quality and post-weld non-destructive testing methods, at present, OEMs are urgently looking for equipment that ca...

AI Technical Summary

Problems solved by technology

However, due to the complexity and uncertainty of the resistance spot welding process, real-time monitoring of spot welding quality in the production process is difficult, and non-destructive testing after welding is a hot research topic in recent years, and its implementation is relatively easy, but due to its operating environment uniqueness, it is also difficult to apply to online detection

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