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A Study of Optimum Shielding Gas Flow Rate in FCAW for Shipbuilding

선박조립과정의 FCAW 적용시 적정 보호가스 유량에 대한 연구

  • 이훈동 (대한조선 주식회사) ;
  • 심천식 (국립목포대학교 조선공학과) ;
  • 송하철 (국립목포대학교 조선공학과) ;
  • 염재선 (국립목포대학교 조선공학과)
  • Received : 2010.04.21
  • Accepted : 2010.11.12
  • Published : 2011.02.20

Abstract

FCAW(Flux Cored Arc Welding) is a widely used welding method in shipbuilding. It also conducts WPS(Welding Procedure Specification) requested by the classification variations of the factors which affect the quality on the welded area such as thickness of base metal, type of welding wire and shielding gas etc. which has to be satisfied. CO2 is commonly used as a shielding gas for FCAW due to the economic point of view. The amount of shielding gas is stated when classification certify WPS. However, the shielding gas is unnecessarily used at the shipyard leaning only on the welder's experience as there are classification standards for using the shielding gas. It causes production cost to rise. Also recently, CO2 is a main contributor for global warming, and large amounts of CO2 are discharged into the atmosphere during shipbuilding processes without any filtration. Therefore it was confirmed by the security of the welded area as a result of conducting the destructive and non-destructive tests with setting up the factors and the standards by using the Taguchi method. Then the FCAW shielding gas's amounts were calculated precisely when assembling a ship. It will be applied to cost reduction and prevention of environmental pollution at the shipyard.

Keywords

References

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