Electromagnetic ultrasonic detection system and method

Abstract

The invention belongs to the field of defect detecting of additive manufacturing, and in particular discloses an electromagnetic ultrasonic detection system and method. The electromagnetic ultrasonic detection system comprises a control sub-system, a transmitting sub-system, a receiving sub-system and a data processing sub-system; the control sub-system comprises an upper computer and a main control module realizing communication; the transmitting sub-system comprises a high power pulse generation module and a pulse source transmitting probe, which are arranged in sequence; when detection is carried out, the upper computer transmits an external detection instruction into the main control module; the main control module controls the high power pulse generation module to generate a pulse string synthesized by multiplex Marx circuit attenuation pulse according to the detection instruction; the pulse string is received by the pulse source transmitting probe, and transmitted to a test piece to be detected; therefore, electromagnetic ultrasonic wave is generated in the test piece to be detected; and the electromagnetic ultrasonic wave is received by the receiving sub-system, sent into the data processing sub-system, and then, transmitted to the upper computer through the main control module. The electromagnetic ultrasonic detection system and method disclosed by the invention can realize non-contact type detection of a work piece in an additive manufacturing process, and have the advantages of being high in detection precision, diversified in detection frequency, large in 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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