Flaw qualitative method in Ultrasonic detecting technique

Flaw qualitative method in Ultrasonic detecting technique  

Content : this article comprehensively introduces current main methods of flaw qualitative assessment in ultrasonic detection technique 。

Ultrasonic nondestructive detecting technique has three key problems is respectively flaw positioning 、quantify and qualitative assessment,so far ,extended ultrasonic detecting technicists have done amount of experimental research,and have achieved great progress on flaw positioning and qualitative assessment,and gradually tend to grown and perfect, such as many technical specification  Of relevant to ultrasonic inspection,for making sure flaw buried depth and projecting position on detecting surface,assessing flaw size,extend length and flaw projection area and so on have specific regulation，having great effects on assuring quality and safety to use of product structure。However,have considerably  difficult in flaw qualitative assess ,this is mainly due to defect has reflection characteristics on ultrasonic  and depend on orientation and geometrical shapes 、length and thickness relative to ultrasonic transmission direction、flaw surface roughness、flaw inclusion and the kinds  and properties of flaw ，and relevant to ultrasonic detecting system properties and displayed methods，therefore, Achieved flaw ultrasonic response from ultrasonic detection is comprehensive response,at present,normally used ultrasonic detecting technique is still hard to identify above factors from comprehensive responses,it takes difficulty to qualitative assessment。In practical detection ,due to hard to judge flaw nature, tend to make products with flaw be rejected and generate unnecessary waste,simultaneously,it maybe neglect some products with dangerous flaws,it generates underlying threat for safe use of products 。

The purpose of this article is try to make a comprehensive introduction on extended ultrasonic detecting operators have researched on flaw qualitative so as to promote the development on flaw qualitative assessment methods