Abstract
Ultrasonic excitation has been widely used in the detection of microcracks on metal surfaces, but there are problems such as poor excitation effect of ultrasonic pulse, long time to reach the best excitation, and difficult to find microcracks. In this paper, an adaptive ultrasonic pulse excitation device and infrared thermal imaging technology have been combined, as well as their control method, to solve the problem. The adaptive ultrasonic pulse excitation device adds intelligent modules to realize automatic adjustment of detection parameters, which can quickly obtain reliable excitation; the multidegree-of-freedom base realizes the three-dimensional direction change of the ultrasonic gun to adapt to different excitation occasions. When the appropriate ultrasonic excitation makes microcracks in the resonance state, the microcracks can be frictionated, which produce heat rise with the temperature. Then, the microcrack defect can be detected by the infrared thermal instrument through the different surface temperatures with imaging recognition method. Our detection experiments of the titanium alloy plates and the aluminum alloy profiles of marine engineering show that the method can get reliable detection parameters in a short time and measure the crack length effectively. It can be used in many aspects such as crack detection in mechanical structures or complex equipment operating conditions and industrial production processes.
Highlights
Metal components are widely used in marine engineering, aerospace, vehicle engineering, and many other fields, and cracks and other defects are unavoidable in the process of production and operation. erefore, the detection of cracks in metal parts of large-scale equipment has put forward higher and higher requirements
In engineering practice, microcracks on the metal surfaces are difficult to be directly observed by human eyes. erefore, nondestructive testing methods such as ultrasound, radiation, penetration, infrared, and eddy current are often used for regular testing [2,3,4,5,6]
Ultrasonic testing is suitable for various types of workpieces, which can detect surface cracks, internal cracks, and quantify cracks [7,8,9,10,11]
Summary
Received 13 May 2021; Revised 15 June 2021; Accepted 26 June 2021; Published 10 July 2021. An adaptive ultrasonic pulse excitation device and infrared thermal imaging technology have been combined, as well as their control method, to solve the problem. Our detection experiments of the titanium alloy plates and the aluminum alloy profiles of marine engineering show that the method can get reliable detection parameters in a short time and measure the crack length effectively. It can be used in many aspects such as crack detection in mechanical structures or complex equipment operating conditions and industrial production processes
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