Journal Published Online: 26 July 2018
Volume 47, Issue 1

Numerical Study on the Leakage Magnetic Field of Transverse Defect on T-Joint Fillet Weld



A 3D finite element method model is established for yoke-magnetization detection of a transverse defect on T-joint fillet weld and solved by the finite element software ANSOFT Maxwell (ANSYS, Canonsburg, PA). The leakage magnetic field around the transverse defect is obtained. The relationship between the width of transverse defect and leakage magnetic field signals is identified. The researchers found that the tangential component of magnetic flux leakage density, BX1, tends to be a parabolic distribution and reaches the maximum value near the center of the defect along the length direction. While BX1 shows a bimodal distribution, featuring two peaks near the edge of the defect and one peak valley at the center along the width direction, the normal component of magnetic flux leakage density, BZ1, is very different than that of BX1 along the width direction, presenting an approximate N-shape as a whole. The leakage magnetic field signals of the transverse defect on the fillet weld of the T joint will decay obviously when the scanning line is perpendicular to the weld surface over 0.5 mm. The results of numerical simulation can provide a theoretical foundation to detect and characterize various defects in the fillet weld.

Author Information

Pan, Jiajing
College of Electromechanical Engineering, Qingdao University of Science and Technology, Qingdao, China
Yang, Lijun
School of Materials Science and Engineering, Tianjin University, Tianjin, China Tianjin Key Laboratory of Advanced Joining Technology, Tianjin, China
Li, Hang
Han’s Laser Technology Co., Ltd., Shenzhen, China
Pages: 10
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Stock #: JTE20160416
ISSN: 0090-3973
DOI: 10.1520/JTE20160416