Microstructural behavior on weld fusion zone of Al-Ti and Ti-Al dissimilar lap welding using single-mode fiber laser
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Titanium (Ti) metal and its alloys are desirable materials for ship hulls and other ocean structuresbecause of their high strength, corrosion-resistance and light weight properties. And light weight and corrosion-resistant aluminum (Al) is the ideal metal for shipbuilding. The joining of Ti and Al dissimilar metals isone of the effective methode to reduce weight of the structures. Ti and Al have great differences in materialsproperties, and intermetallic compounds such as Ti3Al, TiAl, TiAl3 are easily formed at the contacting surfacebetween Ti and Al. Thus, dissimilar welding and joining of Ti and Al are considered to be very difficult. However, it was clarified that ultra-high speed welding could suppress the formation of intermetallic compoundsin the previous study. Results of tensile shear strength increases with an increase in the weldingspeed, and therefore extremely high welding speed (50 m/min) is good to dissimilar weldability for Ti andAl. In this study, therefore, full penetration dissimilar lap welding of Ti (upper) - Al (lower) and Al (upper)- Ti (lower) with single-mode fiber laser was tried at ultra-high welding speed, and the microstructure of theinterface zones in the dissimilar Al and Ti weld beads was investigated.
Abstract
Titanium (Ti) metal and its alloys are desirable materials for ship hulls and other ocean structuresbecause of their high strength, corrosion-resistance and light weight properties. And light weight and corrosion-resistant aluminum (Al) is the ideal metal for shipbuilding. The joining of Ti and Al dissimilar metals isone of the effective methode to reduce weight of the structures. Ti and Al have great differences in materialsproperties, and intermetallic compounds such as Ti3Al, TiAl, TiAl3 are easily formed at the contacting surfacebetween Ti and Al. Thus, dissimilar welding and joining of Ti and Al are considered to be very difficult. However, it was clarified that ultra-high speed welding could suppress the formation of intermetallic compoundsin the previous study. Results of tensile shear strength increases with an increase in the weldingspeed, and therefore extremely high welding speed (50 m/min) is good to dissimilar weldability for Ti andAl. In this study, therefore, full penetration dissimilar lap welding of Ti (upper) - Al (lower) and Al (upper)- Ti (lower) with single-mode fiber laser was tried at ultra-high welding speed, and the microstructure of theinterface zones in the dissimilar Al and Ti weld beads was investigated.
참고문헌 (7)
- C. Leyens, "Titanium and Titanium Alloys; Fundamentals and Applications" (2003), WILEY-VCH GmbH & Co. KGaA
- S. Chen, "Joining mechanism of Ti", Al dissimilar alloys during laser welding-brazing process, 2011, pp.509(3), 891~898
- Y. C. Chen, "Microstructural characterization and mechanical properties in friction stir welding of aluminum and titanium dissimilar alloys", Materials and Design, 30(3), pp.469~474 (2009)
- Katayama Seiji, "Laser welding", Journal of the Japan welding society, 78(2), pp.124~138 (2009)
- Katayama Seiji, "Laser welding for manu-facturing innovation", Journal of the Japan welding society, 78(8), pp.682~692 (2009)
- Hideyasu Shamoto, "The feature of high power single mode fiber laser processing", Proceedings of the 72nd Laser Materials Processing Conference, pp.31~34 (2009)
- S. J. Lee, "Weldability of Ti and Al dissim-ilar metals using single-mode fiber laser", Journal of Laser Micro, 2013, pp.8(2), 149~154