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闫德俊,李海洋,刘晓莉,钟美达,罗玖强,粱志敏.船用5083铝合金变极性等离子焊接头组织和性能[J].稀有金属材料与工程(英文),2018,47(10):3161~3166.[YAN De-jun,LI Hai-yang,LIU Xiao-li,ZHONG Mei-da,LUO Jiu-qiang and LIANG Zhi-min.Microstructure and Mechanical Properties of Variable Polarity Plasma Arc Welded of 5083SAluminumSAlloySfor Shipbuilding[J].Rare Metal Materials and Engineering,2018,47(10):3161~3166.]
Microstructure and Mechanical Properties of Variable Polarity Plasma Arc Welded of 5083SAluminumSAlloySfor Shipbuilding
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Received:November 29, 2016  Revised:August 03, 2018
DOI:
Key words: 5083 aluminum alloy  variable polarity plasma welding  microstructure  mechanical properties
Foundation item:中国博士后科学基金资助项目(2016M590821),国防科学技术工业基础研究项目(A0720133002),黄埔区科技计划项目(201518),河北省自然科学基金(E2016208077)
Author NameAffiliation
YAN De-jun,LI Hai-yang,LIU Xiao-li,ZHONG Mei-da,LUO Jiu-qiang and LIANG Zhi-min  
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Abstract:
      5000 series (Al-Mg) aluminum alloy for shipbuilding with thickness of 5mm was successfully welded by variable polarity plasma welding process at vertical-up position. The microstructure and mechanical properties of the joint were investigated. The ultimate tensile strength of the joint was 295MPa, the elongation was 10%, and the location of fracture was near the partly melted zone. The micro hardness of fusion line and heat affected zone was lower than the base metal, and the lowest hardness appeared in the center of the weld. The optical micrographs of the joint shown that the weld microstructure near the fusion line was coarse equiaxed grain structure and most of the weld region was cellular dendritic structure which grown from the two sides to the middle, while the microstructure of heat affected zone was typical recrystallization structure. The composition around the tensile fracture position was analyzed by EPMA, and the results revealed that the content of Mg was low and heterogeneously distributed. The lack and segregation of Mg and non-homogeneous microstructure decreased solution strengthening and resulted in a weak zone of the joint.