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http://dx.doi.org/10.5781/JWJ.2015.33.1.61

Effect of welding condition on microstructures of weld metal and mechanical properties in Plasma-MIG hybrid welding for Al 5083 alloy  

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)
Publication Information
Journal of Welding and Joining / v.33, no.1, 2015 , pp. 61-71 More about this Journal
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
Plasma-MIG Hybrid Welding(PMHW); Al 5083-O alloy; Tensile property; Hardness; porosity;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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