電子ビーム溶接によるSiC粒子強化アルミニウム合金とAl-Si, Al-Mg, Al-Mg-Si, Al-Zn-Mg-Cu 系合金との異種溶接性

概要

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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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