선박조립과정의 FCAW 적용시 적정 보호가스 유량에 대한 연구

• Published in: 大韓造船學會 論文集 Vol. 48; no. 1; pp. 76 - 83
• Main Authors: 이훈동(Hoon-dong Lee), 심천식(Chun-Sik Shim), 송하철(Ha-Cheol Song), 염재선(Jae-Seon Yum)
• Format: Journal Article
• Language: Korean
• Published: 대한조선학회 2011
• Subjects: FCAW(Flux Cored Arc Welding); WPS(Welding Procedure Specification); shielding gas; Taguchi method
• ISSN: 1225-1143; 2287-7355

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.