A non-destructive testing method for thin cladding layer thickness based on ultrasonic surface waves

Abstract

The invention provides a method for lossless evaluation of the thickness of a thin cladding layer based on ultrasonic surface waves. According to an attenuation law of the ultrasonic surface waves in a medium, a relation between transmission distances and received signal characteristic parameters of the ultrasonic surface waves in a laser cladding layer sample is established, the optimal transmission distance is selected to serve as the separation distance between a transmitting probe and a receiving probe, a double-ultrasonic surface wave probe is manufactured, a node of a beginning wave signal of the ultrasonic surface waves on a time shaft is kept unchanged, so that the time differences of received signals of the ultrasonic surface waves in the laser cladding layer sample in various thicknesses are calculated, a relation between the time differences and the thicknesses of the laser cladding layer is established, a formula used for evaluating the thickness of the laser cladding layer is obtained through fitting, the time differences of the received signals of the ultrasonic surface waves in the laser cladding layer sample are collected and calculated, the time differences are substituted into the calibrated formula, lossless evaluation of the thickness of the laser cladding layer can be achieved, operation is simple and convenient, and detection is rapid.

Description

technical field [0001] The invention relates to a nondestructive measurement method for the thickness of a thin cladding layer, in particular to a nondestructive detection method for the thickness of a thin cladding layer based on ultrasonic surface waves. Background technique [0002] At present, every year in our country, a large number of scrap iron and steel parts are recycled as scrap iron and steel, resulting in waste of resources and energy and pollution of the environment. Starting from the sustainable development of resources, environment and social economy, the recycling and remanufacturing of scrap steel parts is of great significance to energy saving, material conservation, environmental protection and the promotion of coordinated development of social economy and the environment. [0003] It is an effective method to improve the surface performance and prolong the service life of workpieces by preparing coatings with required properties on the surface of waste w...

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Problems solved by technology

At present, the thickness measurement methods are mainly metallographic method, ultrasonic longitudinal wave method and electromagnetic method. Although the above methods can realize the evaluation of the thickness of the laser cladding layer to a certain extent, there are certain problems. For example, the metallographic method needs to destroy the overall performance of the sample. , and it is a sampling test; the ultrasonic longitudinal wave method has detection blind spots on the surface of the sample, and cannot realize the evaluation of the thickness of the thin laser cladding layer (thickness ≤ 3.0mm); the electromagnetic method is only applicable to conductive / magnetic materials, and has relatively large limitations

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