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The Weldability of Laminated Stator Core for Motor by Pulsed Nd:YAG Laser [II] - Investigation of Mechanism on Formation of Weld Defect -  

Kim Jong-Do (한국해양대학교 기관시스템공학부)
Kil Byung-Lea (한국해양대학교 기관시스템공학부)
Lee Chang-Je (한국해양대학교 대학원)
Publication Information
Journal of Advanced Marine Engineering and Technology / v.30, no.5, 2006 , pp. 636-644 More about this Journal
Abstract
Recently, there were some successful examples that the laser welding was introduced into production line. However, the spread of laser welding is not sufficient in many industries. There are several reasons why it is difficult to penetrate the laser welding into production lines. Because it is different from reflection, absorption and permeation of laser beam according to material and surface condition. Moreover, there are significant problems in processing such as absorption and scattering of beam by the induced plasma or plume. Therefore, understanding of mechanism on formation of weld defect in laser welding of the laminated core for motor is very important. In this paper, it was analyzed in terms of materials which was source of defect in laser welding and conventional arc welding. As a results of analysis, insulation coating film of the laminated core was judged to main factor of weld defect. it could be well aware as tracing carbon volume, and it was deduced that weld defect by insulation coating film was caused by difference of mechanism between the two heat sources.
Keywords
Pulsed Nd:YAG laser; Arc welding; Silicon steel sheet; Insulation coating; Porosity;
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