A study on development of automatic welding system for corrugated membranes of the LNG tank

LNG 탱크의 주름진 내벽박판용 자동용접시스템의 개발에 관한 연구

  • 유제용 (한국과학기술원, 기계공학과) ;
  • 유원상 (한국과학기술원, 기계공학과) ;
  • 나석주 (한국과학기술원 기계공학과) ;
  • 강계형 (대우중공업㈜ 생산기술연구소) ;
  • 한용섭 (대우중공업㈜ 생산기술연구소)
  • Published : 1996.02.01

Abstract

Development of an automatic TIG welding system incorporating a vision sensor and torch control mechanism leads to an improved welding quality and greater production efficiency. The automatic welding system should be greatly restricted in its size and weight for the LNG(Liquefied Natural Gas) storage tank and also provide a unique torch rotating mechanism which keeps the torch tip in the constant position while the angle is changed continuously to maintain the welding torch substantially perpendicular to the weld line. The developed system is driven by two translation axes X, Z and one rotational axis. A moving line window method is adopted to the image recognition of the corrugated membranes with specular reflection. This method decides original laser stripe patterns in image which is affected by multi-reflection. A self-teaching algorithm, which guides the automatic welding machine with the information provided by the CCD camera without any previous learning of a reference trajectory, was developed for tracking the corrugated membrane of the LNG tank along the weld line.

Keywords

References

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