The Journal of Korean Academy of Prosthodontics (대한치과보철학회지)

The Korean Academy of Prosthodonitics (대한치과보철학회)
권호 표지

MECHANICAL PROPERTIES OF LASER-WELDED CAST TITANIUM AND TITANIUM ALLOY

원심 주조된 타이타늄과 타이타늄 합금의 레이저 용접 특성

  • Yun, Mi-Kyung (Department of Prosthodontics, College of Dentistry, Chonnam National University) ;
  • Kim, Hyun-Seung (Department of Prosthodontics, College of Dentistry, Chonnam National University) ;
  • Yang, Hong-So (Department of Prosthodontics, College of Dentistry, Chonnam National University) ;
  • Vang, Mong-Sook (Department of Prosthodontics, College of Dentistry, Chonnam National University) ;
  • Park, Sang-Won (Department of Prosthodontics, College of Dentistry, Chonnam National University) ;
  • Park, Ha-Ok (Department of Prosthodontics, College of Dentistry, Chonnam National University) ;
  • Lee, Kwang-Min (School of Materials Science and Engineering, Chonnam National University)
  • 윤미경 (전남대학교 치과대학 치과보철학교실) ;
  • 김현승 (전남대학교 치과대학 치과보철학교실) ;
  • 양홍서 (전남대학교 치과대학 치과보철학교실) ;
  • 방몽숙 (전남대학교 치과대학 치과보철학교실) ;
  • 박상원 (전남대학교 치과대학 치과보철학교실) ;
  • 박하옥 (전남대학교 치과대학 치과보철학교실) ;
  • 이광민 (전남대학교 공과대학 신소재공학부)
  • Published : 2006.10.31
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Abstract

Purpose : The purpose of this study was to investigate the effect of the output energy(voltage) of laser welding on the strength and properties of joint of cast titanium(CP Gr II) and titanium alloy(Ti-6Al-4V). Material and method : Cast titanium and its alloy rods(ISO6871) were prepared and perpendicularly cut at the center of the rod. After the cut halves were fixed in a jig, and the joints welded with a laser-welding machine at several levels of output voltage of $200V{\sim}280V$. Uncut specimens served as the non-welded control specimens The pulse duration and pulse spot size employed in this study were 10ms and 1.0mm respectively. Tensile testing was conducted at a crosshead speed of 0.5mm/min. The ultimate tensile strength(MPa) was recorded, and the data (n=6) were statistically analyzed by one-way analysis of variance(ANOVA) and Scheffe's test at ${\alpha}$=0.05. The fracture surface of specimens investigated by scanning electron microscope (SEM). Vickers microhardness was measured under 500g load of 15seconds with the optimal condition of output voltage 280V. Results : The results of this study were obtained as follows, 1. When the pulse duration and spot size were fixed at 10ms and 1.0mm respectively, increasing the output energy(voltage) increased UTS values and penetration depth of laser welded to titanium and titanium alloy. 2. For the commercial titanium grade II, ultimate tensile strength(665.3MPa) of the specimens laser-welded at voltage of 280V were not statistically(p>0.05) different from the non-welded control specimens (680.2MPa). 3. For the titanium alloy(Ti-6Al-4V), ultimate tensile strength(988.3MPa) of the specimens laser-welded at voltage of 280V were statistically(p<0.05) different from the non-welded control specimens (665.0MPa). 4. The commercial titanium grade II and titanium alloy(Ti-6Al-4V) were Vickers microhardness values were increased in the fusion zone and there were no significant differences in base metal, heat-affected zone.

Keywords

References

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