Ультразвуковой контроль волнами Релея и Лэмба металлоизделий с кривизной поверхности

Abstract

В данной статье приведены результаты исследований возможности ультразвукового контроля с использованием ЭМА преобразователей. С целью установления возможности проведения эффективного ультразвукового контроля качества поверхности изделий с изменяемой формой поверхности электромагнитно-акустическим ультразвуковым способом выполнены экспериментальные исследования. Определены условия, при которых ультразвуковые поверхностные волны Релея и Лэмба, генерируемые и принимаемые ЭМА преобразователями, позволяют выявлять эхо на наружной поверхности труб.

The article presents the results of research of possibilities of ultrasonic inspection using EMAT transducers. In order to establish the possibility of effective ultrasonic surface quality control of products with variable shape of the surface using the electromagnetic acoustic ultrasonic method experimental studies were performed. Substantial difficulties arise during the control of thin metal or, if necessary, when detecting surface defects in accordance with the requirements of normative-technical documentation. For each products surface curvature it is necessary to make a separate piezoelectric transducer. Some tubulars have an outer and inner surface waviness, nicks, indentations, metal nicked, substantially exceeding the established specifications and technical documentation on depth. Costs of control are substantially increased. The conditions under which the ultrasonic Rayleigh and Lamb surface waves generated and received by EMA transducers allow the identification of the echo on the outer surface of the pipe were defined. Much of metal structures and other products used in the industry, have a complex shape and very often not made of thick metal: pipes, sheets, curved profiles, etc.