Resistance spot welding quality detection device and method

Abstract

The invention relates to a resistance spot welding quality detection device and method, and belongs to the field of resistance spot welding quality detection. The resistance spot welding quality detection device comprises an upper electrode, a lower electrode, an ultrasonic probe, an upper electrode cap shell, a lower electrode cap shell, a gasket, a high-temperature coupling agent, a spring, a screw, an ultrasonic card and a computer; the ultrasonic probe is arranged in a hollow cavity formed by the upper electrode cap shell and the lower electrode cap shell and has the position fixed by thegasket and the spring; it is guaranteed that the ultrasonic probe vertically emits ultrasonic beams into a welded workpiece in the welding process; the ultrasonic probe is directly coupled with the lower electrode cap shell through a high-temperature coupling agent and is connected with the ultrasonic card and the computer through data lines. According to the detection method, the spot welding quality is rapidly detected by analyzing the characteristics of an M display image without a complex signal processing technology, 100% in-service detection of welding spots in the production process canbe realized in practice, and meanwhile, interference and influence of welding spot indentations on ultrasonic detection signals during general ultrasonic detection are avoided.

Description

technical field [0001] The invention relates to the field of resistance spot welding quality detection, in particular to a resistance spot welding quality detection device and method. Through the built-in ultrasonic probe in the hollow cavity composed of the upper shell of the electrode cap and the lower shell of the electrode cap, and based on the ultrasonic continuous signal acquisition software, the formation, expansion and solidification process of the liquid nugget caused by heat input before and after the resistance spot welding nugget formation process can be obtained in real time The A-wave data reflected by the ultrasonic wave, using the industrial computer data processing module to matrix-process the A-wave data to obtain the M display map of the welding process based on the ultrasonic signal, and judge the quality of the solder joints according to the change characteristics of the M display map. Background technique [0002] According to the development and applic...

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Problems solved by technology

The detection results of the above method are accurate, but the waste of materials is serious, and it involves a series of processes such as sample preparation, grinding and polishing, corrosion, etc., the detection cycle is long, the efficiency is low, and more importantly, it is impossible to detect welded joints in service

The non-destructive testing of spot welded joints mainly uses ultrasonic testing methods. The adv

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