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Analysis of Key Technologies and Equipments Development of Largescale melted Extrusion Manufacturing Systems

Journal of Materials Science & Technology 2003年第Z1期19卷 215-217页

作者： Lei ZHANG Sheng CHEN Yongnian YAN Renji ZHANG Center for Laser Rapid Forming Dept. of Mechanical Engineer Tsinghua University Beijing 100084 China Center for Laser Rapid Forming Dept. of Mechanical Engineer Tsinghua University Beijing 100084 China Center for Laser Rapid Forming Dept. of Mechanical Engineer Tsinghua University Beijing 100084 China Center for Laser Rapid Forming Dept. of Mechanical Engineer Tsinghua University Beijing 100084 China

To develop large-scale RP systems used to producing functional parts and large-sized models has become an urgentcall now. In this paper, a large-scale RP system, MEM600-l, based on the melted extrusion manufacturing (MEM)process has been developed successfully. And the key issues to develop such a system are discussed. Based on theactual forming experiment, it is concluded that the MEM600-l works reliably and the forming efficiency is muchhigher than its parallel equipments.

关键词： melted extrusion manufacturing, Large-scale RP systems, Forming efficiency

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Microstructure and Corrosion Properties of the Plasma-MIG Welded AA5754 Automotive Alloy

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Journal of Minerals and Materials Characterization and Engineering 2015年第4期3卷 318-325页

作者： A. Abouarkoub G. E. Thompson X. Zhou G. Scamans The Libyan Petroleum Institute Tripoli Libya School of Materials The University of Manchester Manchester UK Innoval Technology Limited Banbury UK

The influence of heating cycles during plasma metal inert gas (MIG) welding on the microstructure and corrosion properties of the AA5754 automotive alloy has been investigated. The high heat input during plasma-MIG welding results in a significant modification in the microstructure of the AA5754 alloy adjacent to the fusion boundaries. As a consequence of partial melting of the Al-Fe-Mn-(Si) intermetallics at the partially melted zone (PMZ) and segregation of the high melting point elements (particularly Fe and Mn) toward the fusion zone, severe galvanic corrosion attacks can be enhanced along the PMZ of the AA5754 weld during exposure to aqueous corrosion environments.

关键词： Plasma-MIG Welding AA5754 Microstructure Corrosion Partially melted Zone

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