起重机金属结构焊缝表面裂纹红外热波检测仿真研究

Simulation of Infrared Thermal-wave Test on Weld Surface Crack of Crane Metal Structure

起重机金属结构焊缝检测主要采用通用的无损检测方法,检测效率低、检测长度严重不足.文中介绍了焊缝表面裂纹检测的一种新方法———红外热波检测法,利用ANSYS有限元仿真软件,分析了不同的加热和散热时间、不同裂纹尺寸、不同热流大小和加热面积、不同钢板厚度的焊缝表面裂纹的温度场异常分布情况,从而得到了红外热播法检测焊缝表面裂纹的各种影响因素.

General nondestructive testing （NDT ） techniques are widely applied in inspecting structural weld of crane ,which are inefficient and can’t satisfy the testing length .This paper reports a new weld surface crack testing technique ,named infrared thermal wave testing technique .Via ANSYS fi-nite element analysis （FEA ） ,the study is simulated by altering heating and cooling time ,crack size , intensity of heat flow ,heating area and steel plate thickness ,and then the peculiar thermal distribu-tion of weld surface crack and various influencing factors of weld crack inspection are obtained .The study offers valuable references for further investigating fast weld crack inspection of metal structure .