Journal of Welding and Joining

The Korean Welding and Joining Society (대한용접접합학회)
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Effect of welding condition on microstructures of weld metal and mechanical properties in Plasma-MIG hybrid welding for Al 5083 alloy

알루미늄 5083 합금의 플라즈마 미그 하이브리드 용접시 용접부 미세조직과 기계적 성질 변화에 미치는 용접조건의 영향

  • Park, Sang-Hyeon (Department of Applied Hybrid Materials, Pusan National University) ;
  • Lee, Hee-Keun (Department of Material Science and Engineering, Pusan National University) ;
  • Kim, Jin-Young (Industry Research Laboratories, Daewoo Shipbuilding Engineering Co.) ;
  • Chung, Ha-Taek (Industry Research Laboratories, Daewoo Shipbuilding Engineering Co.) ;
  • Park, Young-Whan (Department of Mechanical Engineering, Pukyung National University) ;
  • Kang, Chung-Yun (Department of Applied Hybrid Materials, Pusan National University)
  • 박상현 (부산대학교 융합학부) ;
  • 이희근 (부산대학교 재료공학과) ;
  • 김진용 (대우조선해양 산업기술 연구소) ;
  • 정하택 (대우조선해양 산업기술 연구소) ;
  • 박영환 (부경대학교 기계공학과) ;
  • 강정윤 (부산대학교 융합학부)
  • Received : 2014.12.05
  • Accepted : 2015.02.17
  • Published : 2015.02.28
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Abstract

The effect of welding condition on microstructure and mechanical property of Plasma-MIG Hybrid Weld between Al 5083 plates(thickness : 10mm) was investigated. 1 pass weld without any defects such as puckering, undercut, and lack of fusion was obtained by 150~200A of plasma current and 5~7mm of welding speed. Gas porosities and shrinkage porosities were existed in the weld near fusion line. As welding speed and plasma current were decreasing, the area fraction of porosity was increasing. The hardness of the weld is increasing as welding speed. On the basis of microstructural analysis, Mg segregated region near dendrite boundaries tends to increase with the welding speed. In the result of hardness test, Distribution of hardness in fusion zone showed little change with the plasma current. However, when the welding speed increased, hardness in weld metal markdly increased. It could be considered that effect of heat input to growth of the dendritic solidification structures. Based on tensile test, tensile properties of weld metal was predominated by area fraction of porosities. Consequently, tensile properties can be controlled by formation site and area fraction of porosity.

Keywords

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