A Method for Ultrasonic Detection and Analysis of Defect Types in Laser Cladding Remanufactured Parts

Abstract

A method for ultrasonic detection and analysis of defect types of laser cladding remanufactured parts. An ultrasonic longitudinal wave probe is placed on the surface of the laser cladding remanufactured part, and the gain parameter of the sampling system is set; the probe is moved on the part surface; and the detected defects are collected Echo signal, and transmit it to the signal analysis system, replace the longitudinal wave straight probe with a small angle longitudinal wave probe, move the probe on the surface of the part, collect the defect echo signal scanned again, and transmit it to the signal analysis In the system; replace the small-angle longitudinal wave probe again, collect the defect echo signals detected by scanning, and transmit them to the signal analysis system; use the signal analysis system to perform fast Fourier (fft) transform processing on the defect signals collected three times , to obtain the spectrum analysis diagram of the defect echo signal under the three detection methods; the type of defect can be distinguished by observing the shape of the defect echo spectrum and whether it is related to the direction of ultrasonic detection, and the degree of closeness of the correlation.

Description

technical field [0001] The invention relates to the field of measurement, in particular to a method for detecting internal defects of laser cladding remanufactured parts based on ultrasonic longitudinal waves and analyzing the type of defects. Background technique [0002] At present, every year in our country, a large number of scrap steel parts are recycled as scrap steel at the material level, resulting in the waste of resources and energy and the pollution of the environment. Remanufacturing takes high quality, high efficiency, energy saving, material saving, and environmental protection as the main goals, and is guided by the whole life cycle, so that the negative impact of waste products on the environment is minimized and the utilization rate of resources is the highest. Reach the best performance requirements. It is of great significance to energy saving, material saving, environmental protection and promoting the coordinated development of social economy and enviro...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the limitations of the existing ultrasonic detection defect type analysis method, which is heavily dependent on the experience and technical level of the inspectors, as well as the degree of understanding of the characteristics of the specific product and the manufacturing process.

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