多层管HIP焊接界面脱粘涡流检测数值模拟研究

采用热等压焊接(HIP)的界面焊接多层管是托卡马克装置换热结构典型部件,其界面焊接不良或脱粘会严重影响材料的传热性能。针对多层管HIP焊接界面裂纹的涡流检测问题,本研究基于退化向量位(Ar)涡流检测分析程序数值模拟分析了双功能DF Bobbin涡流探头的检出性能。数值计算结果表明,对于较大界面脱粘缺陷,基于DF Bobbin探头的涡流检测是可行的。探讨了探头参数(包括探头线圈间距、宽度及外径)与检测性能的相关性,为优化检测探头提供了依据。

Numerical Study on Feasibility of ECT for Detection of Delamination Defect in HIP Welding of Multilayer Tubes

Multilayer tube bonded with HIP welding technology is a key component for heat exchange in Tokamak structures.The interface cracking（delamintion） may reduce the heat transferability of the tubes,and has to be inspected in a nondestructive way.In this paper,the detectability of a Dual-Function（DF） Bobbin ECT probe is evaluated for this purpose through a numerical analysis with a code of reduced vector potential（Ar） formulation.In addition,the influence of the probe parameter,such as the coil gap,outer diameter and thickness,on the probe detectability is also evaluated.The numerical simulation results show that the DF Bobbin probe is capable to detect a delamination defect over size of 3 mm side length and 0.5 mm thickness.The results of this work give good reference data for ECT probe design for detecting delamination defects.