Laser Solutions (한국레이저가공학회지)

Korean Society of Laser Processing (한국레이저가공학회)
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The Relationship between In-process Signals and Weld Defect in $CO_2$ Laser Lap Welding of Zn-coated Steel for Shipbuilding

조선용 아연코팅강판의 $CO_2$ 레이저 겹치기 용접시 인프로세스 측정신호와 용접결함과의 관련성

  • Kim, Jong-Do (Division Marine System Engineering, Korea Maritime University) ;
  • Lee, Chang-Je (Graduate School, Korea Maritime University) ;
  • Lee, Jae-Bum (Graduate School, Korea Maritime University) ;
  • Suh, Jeong (Department of High Density Energy Bead Processing and System, KIMM)
  • 김종도 (한국해양대학교 기관시스템공학부) ;
  • 이창제 (한국해양대학교 대학원) ;
  • 이재범 (한국해양대학교 대학원) ;
  • 서정 (한국기계연구원)
  • Published : 2010.09.30
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Abstract

The in-process monitoring of $CO_2$ welding of Zn-coated steel plates has been studied and compared with that of conventional thin plates. Relationships between weld defects and plasma emission signals were evaluated in laser lap joint of thick Zn-coated steel. According to the study, weld defects were found to increase with Zn content. As a result, measured plasma emission signals also decreased. In case of plate with $15{\mu}m$-thick Zn-coated layer, defects caused by evaporation of Zn could, therfore, controled by gap of 0.1mm, resulting in a stable emission signals. However, the amplitude of signals fluctuated very widely. Variation of amplitude sould be limited in 3-8V by FFT smoothing.

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