An electromagnetic ultrasonic detection system and detection method

Abstract

The invention belongs to the field of additive manufacturing defect detection, and specifically discloses an electromagnetic ultrasonic detection system and a detection method, which include a control subsystem, a transmitting subsystem, a receiving subsystem and a data processing subsystem, and the control subsystem includes a communication The host computer and the main control module, the transmitting subsystem includes the high-power pulse generation module and the pulse source transmitting probe set in sequence; during the detection, the host computer transmits the external detection command to the main control module, and the main control module controls the high-power pulse according to the detection command. The power pulse generation module generates a pulse train synthesized by multi-channel Marx circuit attenuated pulses. The pulse train is received by the pulse source transmitter probe and transmitted to the DUT to generate electromagnetic ultrasonic waves inside the DUT, and the electromagnetic ultrasonic waves are received by the receiving subsystem. And sent into the data processing subsystem, and then transmitted back to the host computer through the main control module. The invention can realize the non-contact detection of workpieces in the process of additive manufacturing, and has the advantages of high detection accuracy, various detection frequencies, large detection depth and the like.

Description

technical field [0001] The invention belongs to the field of detection of defects in additive manufacturing, and more specifically relates to an electromagnetic ultrasonic detection system and detection method, which are suitable for online detection of internal defects of test pieces in the process of additive manufacturing. Background technique [0002] Additive Manufacturing (AM) technology, which integrates computer-aided design, material processing and forming technology, is based on the principle of layered manufacturing and adopts the method of accumulating materials layer by layer, and directly implements the digital model into a new type of manufacturing of physical parts. technology. Additive manufacturing is a bottom-up manufacturing method that realizes structural parts from scratch, which makes it possible to manufacture complex structural parts that were restricted by traditional manufacturing methods in the past. [0003] The additive manufacturing process is...

AI Technical Summary

Problems solved by technology

However, at present, the electromagnetic ultrasonic testing in the process of additive manufacturing is still blank at home and abroad, and the traditional electromagnetic ultrasonic testing system has a single frequency and a single detection waveform, which is generally limited to the detection of near-surface defects, and the surface of the component is required to be flat. Unable to adapt to the requirements of rough shape and detection depth of more than 5mm in the process of additive manufacturing

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