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第三章管材的涡流检测第一节薄壁管的检测一、管材的主要参数目前,金属管材在锅炉、热交换器、反应堆、冷冻系统等制造业中应用日益增多。管制品的缺陷、偏心度、壁厚、合金成份、硬度及其它特性的无损检测是一重要问题,它不同于圆柱体的涡流检测。所需考虑的管材参数及其缺陷有:1.电导率σ:2.铁磁性材料相对磁导率μ~rel;3.外径 d_a=2r_a,r_a 是外半径;4.内径 d_(?)=2r_(?),r_(?),是内半径;
Chapter III Eddy Current Testing of Tubes Section 1 Testing of Thin-Walled Tubes I. Main Parameters of Tubes At present, metal pipes are increasingly used in the manufacturing of boilers, heat exchangers, reactors and refrigeration systems. Nondestructive testing of defects, eccentricity, wall thickness, alloy composition, hardness and other properties of the articles is an important issue, unlike the eddy current testing of cylinders. The required pipe parameters and their defects are: 1. Conductivity σ: 2. Relative permeability of ferromagnetic material μ ~ rel; 3. Outer diameter d_a = 2r_a, r_a is the outer radius; 4. The inner diameter d_ (?) = 2r _ (?), R_ (?), Is the inner radius;