Journal of Light Metal Welding
Online ISSN : 2186-618X
Print ISSN : 0368-5306
ISSN-L : 0368-5306
Volume 46 , Issue 5
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Technical Paper
  • Michinori Okubo, Yoshihiro Kohisa
    2008 Volume 46 Issue 5 Pages 195-201
    Published: May 15, 2008
    Released: January 30, 2014
    The SiC particle reinforced aluminum alloy has been developed for various machine parts. Aluminum welded machine parts are often required welded joints composed of dissimilar alloys. In the present study, electron beam weldability of dissimilar joints was investigated on different combinations of aluminum alloys of 10 mm in thickness. The main alloy is 10% SiC particle reinforced Al-Si aluminum alloy. Combination wrought alloys are Al-Si, Al-Mg, Al-Mg-Si and Al-Zn-Mg-Cu alloys. The electron beam machine is 6 kW for high voltage type. Joint groove is of square butt without filler metal. In case of SiC reinforced alloy/Al-Si and Al-Mg, joints, weldability was poor because some weld imperfections were recognized such as arcing and other defects. In case of SiC reinforced alloy/Al-Mg-Si, Al-Zn-Mg-Cu, the cracking sensitivity is low while some small porosity was recognized. Tensile strength became about 150 MPa such as SiC reinforced alloy. Impact values of SiC reinforced alloy and SiC reinforced alloy/Al-Mg-Si, Al-Zn-Mg-Cu were low. Hardness of SiC reinforced alloy/Al-Mg-Si joint was recovered through 2160 h room temperature ageing. Micro segregation of Si element was recognized for SiC reinforced alloy/Al-Mg-Si joint by EPMA analysis.
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