Spot welding ultrasonic B scanning automatic detection device and method

Abstract

The invention discloses a spot welding ultrasonic B scanning automatic detection device and a method. The device comprises an industrial mechanical arm, wherein the industrial mechanical arm is arranged on the top part of a mechanical arm fixing seat; a detecting device for ultrasonic B scanning detection is arranged on the head part of the industrial mechanical arm, is located right above a detection platform, and is connected with an ultrasonic detector; the ultrasonic detector is connected with an industrial computer; the industrial mechanical arm is connected with a controller for controlling the mechanical arm to act; the detection device is connected with a coupling agent circulation supply system for feeding a coupling agent. The device is simple in structure, high in applicability,and capable of realizing ultrasonic automatic detection on spot welding quality of complex automobile parts; according to the method, through an ultrasonic B scanning local immersion method, dimension information of a welding spot and a welding core is acquired, and the welding spot quality is evaluated, so that the welding spot detection efficiency is improved, and the corrosion damage on the parts is effectively reduced.

Description

technical field [0001] The invention relates to an ultrasonic detection method and device, in particular to an ultrasonic B-scan automatic detection device and method for spot welding, belonging to the field of ultrasonic nondestructive testing. Background technique [0002] Resistance spot welding is a widely used welding process, especially in the manufacture of automobile bodies, where there are as many as 3000-6000 spot welds on the car body. Therefore, the quality inspection of spot welding is the key to ensure the connection strength and safety performance of the car body. Spot welding ultrasonic B-scan imaging is to select any diameter direction of the welding spot for linear moving scanning. During the moving process of the probe, the ultrasonic wave is emitted at a certain time interval, and the corresponding reflected echo signal is received at the same time, and finally the signal amplitude is converted. Into the gray value of the color to form a solder joint ima...

AI Technical Summary

Problems solved by technology

[0003] Ultrasonic B-scan needs to move the focusing probe linearly to scan the solder joint area, and a coupling agent needs to be filled between the probe and the part. Therefore, at present, the ultrasonic B-scan mainly uses the liquid immersion method to detect parts, and the parts need to be completely immersed in water, but this will cause damage to the parts. cause corrosion damage

In addition, the current ultrasonic B-scan detection is through hand-held scanning, which has low detection efficiency and is easily affected by humans, resulting in poor detection accuracy.

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