作者：苏伯泰, 李强, 韩静涛, 张永军

作者单位：北京科技大学材料科学与工程学院, 北京 100083

关键词：脉冲涡流热成像;无损检测;钢材表面裂纹;传送速度;加热功率;线圈提离;裂纹深度;裂纹角度

摘要：

基于脉冲涡流热成像检测技术原理设计开发检测平台，以截面125 mm125 mm，壁厚5 mm的Q345D方矩管为试验材料，在其表面机加工不同深度和角度的矩形凹槽作为裂纹。裂纹区域和无裂纹区域的温差大小直接决定检测效果的优劣，以被检材料传送速度、感应加热功率和线圈提离为3个因素做正交试验，带有裂纹的方矩管在匀速动态状态下被检测，通过对每组试验不同深度裂纹和无裂纹区域的温差数据分析，得到各因素对检测效果的影响趋势和程度。最后通过试验判定感应加热对不同角度裂纹检测效果的影响。结果表明：加热功率和线圈提离对裂纹检测效果影响显著，传送速度影响较小；裂纹自身深度和角度对检测效果有很大影响，深度越大，越容易检测；裂纹与涡流之间的角度越大，检测效果越好。

Effect analysis of steel surface crack inspection based on pulse eddy current thermography

SU Botai, LI Qiang, HAN Jingtao, ZHANG Yongjun

School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China

Abstract: A detection platform was designed and developed based on the principle of pulse eddy current thermography detection technology, Q345D square tube with section area being 125mm×125mm and wall thickness being 5mm was used as test materials, rectangular grooves with different depth and angle were machined on its surface. The temperature difference between the crack area and the crack-free area directly determines the merits of the detection effect. Orthogonal test was carried out based on three factors:the transmission speed of the tested material, the power of induction heating and the lifting of the coil and square tubes with cracks were detected in a uniform dynamic state. Based on the temperature difference analysis test data between the crack area and the crack-free area of each test group, the influence trend and degree of each factor on the detection effect were obtained. Finally, the effect of induction heating on the detection effect of cracks in different angles was obtained by test. The results show that the heating power and coil lifting have a significant influence on the crack detection effect and have a small influence on speed of transmission; the depth and angle of the crack have a great influence on the detection result, the greater the depth is, the easier it can be detect; the greater the angle between the crack and the eddy is, the better the detection effect will be.

Keywords: pulse eddy current thermography;non-destructive testing;surface crack of steel;transmission speed;power of induction heating;lifting of the coil;crack depth;crack angle

2018, 44(5): 147-151,158  收稿日期: 2017-09-12;收到修改稿日期: 2017-11-03

基金项目: 

作者简介: 苏伯泰(1992-),男,山东泰安市人,硕士研究生,专业方向为脉冲涡流热成像检测。

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