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정광운,Yousuke Kawahito,Seiji Katayama 한국정밀공학회 2014 International Journal of Precision Engineering and Vol.1 No.1
This study was performed to investigate the joining possibility and characteristics of the dissimilar joint between carbon fiber reinforced plastics (CFRP) and amorphous polyethylene terephthalate (PET) plastic using a continuous wave (cw) diode laser with a line-shaped beam. Tensile shear test results demonstrated that strong lap joints with a maximum load of 3200 N could be produced under some proper conditions, and base amorphous PET plastic sheet was elongated without fracture. It was confirmed from SEM observation that the dissimilar lap joint was tightly bonded near the joint interface between two materials, and simultaneously integrated by the interdiffusion and mixing process at the joint interface of two materials through rapid melting, solidification and cooling during laser joining. Through high speed video camera observation, the joining phenomena generating in the laser irradiated part during laser joining of CFRP to PET was obviously identified. Consequently, it was revealed that strong dissimilar lap joint of CFRP to engineering plastic could be possible by a direct laser irradiation without adhesive bonds or mechanical fasteners.
이수진,Makoto Takahashi,Yousuke Kawahito,Seiji Katayama 한국정밀공학회 2015 International Journal of Precision Engineering and Vol. No.
The joining or welding of dissimilar metals is one of the effective measures to reduce structures weight of the production or to save rare metals and to save a manufacturing cost. In the weld fusion zone of Ti and Al, intermetallic compounds such as Ti3Al, TiAl, TiAl2 and TiAl3 are easily formed, and especially, brittle TiAl2 and TiAl3 makes such dissimilar metals joining very difficult. However, it was clarified that an ultra-high speed welding could suppress the formation of intermetallic compounds in the previous study.1 Full penetration dissimilar lap welding of Ti and Al with single-mode fiber laser was tried at ultra-high welding speed in this study, and the microstructure of the welded zone, interface zone and base metals in the dissimilar Al and Ti weld bead was investigated. To confirm the formation of intermetallic compounds in the weld fusion zone, welded interface areas were observed and analyzed using scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX) and micro-probe X-ray diffractometer (XRD). Especially microstructural phases of Ti and Al dissimilar welds were confirmed using transmission electron microscopy (TEM) with EDX. It was consequently found that Ti3Al intermetallic compound phase existed in all the weld fusion zones produced under any conditions, but the formation areas of such intermetallic compounds could be reduced by the ultra-high welding speed of 50 m/min.
Lee, Su-Jin,Takahashi, Makoto,Kawahito, Yousuke,Katayama, Seiji Korean Society for Precision Engineering 2015 International Journal of Precision Engineering and Vol.16 No.10
The joining or welding of dissimilar metals is one of the effective measures to reduce structures weight of the production or to save rare metals and to save a manufacturing cost. In the weld fusion zone of Ti and Al, intermetallic compounds such as <TEX>$Ti_3Al$</TEX>, TiAl, <TEX>$TiAl_2$</TEX> and <TEX>$TiAl_3$</TEX> are easily formed, and especially, brittle <TEX>$TiAl_2$</TEX> and <TEX>$TiAl_3$</TEX> makes such dissimilar metals joining very difficult. However, it was clarified that an ultra-high speed welding could suppress the formation of intermetallic compounds in the previous study. Full penetration dissimilar lap welding of Ti and Al with single-mode fiber laser was tried at ultra-high welding speed in this study, and the microstructure of the welded zone, interface zone and base metals in the dissimilar Al and Ti weld bead was investigated. To confirm the formation of intermetallic compounds in the weld fusion zone, welded interface areas were observed and analyzed using scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX) and micro-probe X-ray diffractometer (XRD). Especially microstructural phases of Ti and Al dissimilar welds were confirmed using transmission electron microscopy (TEM) with EDX. It was consequently found that <TEX>$Ti_3Al$</TEX> intermetallic compound phase existed in all the weld fusion zones produced under any conditions, but the formation areas of such intermetallic compounds could be reduced by the ultra-high welding speed of 50 m/min.