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Weldability with Process Parameters During Fiber Laser Welding of a Titanium Plate (I) - Effect of Type and Flow Rate of Shielding Gases on Weldability -

티타늄 판재의 파이버 레이저 용접시 공정변수에 따른 용접특성 (I) - 실드가스 종류 및 유량에 따른 영향 -

  • Kim, Jong Do (Division of Marine Engineering, Korea Maritime and Ocean Univ.) ;
  • Kim, Ji Sung (Graduate School, Korea Maritime and Ocean Univ.)
  • 김종도 (한국해양대학교 기관공학부) ;
  • 김지성 (한국해양대학교 대학원 기관공학과)
  • Received : 2016.09.22
  • Accepted : 2016.11.10
  • Published : 2016.12.01

Abstract

In this study, welding of pure titanium was carried out by using a continuous wave fiber laser with a maximum output of 6.3 kW. Because brittle regions form easily in titanium as a result of oxidation or nitriding, the weld must be protected from the atmosphere by using an appropriate shielding gas. Experiments were performed by changing the type and the flow rate of shielding gases to obtain the optimal shielding condition, and the weldability was then evaluated. The degree of oxidation and nitriding was distinguished by observing the color of beads, and weld microstructure was observed by using an optical microscope and a scanning electron microscope. The mechanical properties of the weld were examined by measuring hardness. When the weld was oxidized or nitrified, the bead color was gray or yellow, and the oxygen or nitrogen content in the bead surface and overall weld tended to be high, as a result of which the hardness of the weld was thrice that of the base metal. A sound silvery white bead was obtained by using Ar as the shielding gas.

Keywords

Pure Titanium;Laser Welding;Fiber Laser;Shielding Gas;Flow Rate;Oxidation

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