• Title/Summary/Keyword: $CO_2$ 레이저 용접

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Microstructures and Mechanical Properties of GTD 111DS Welds by $CO_2$ Laser Welding ($CO_2$ 레이저를 이용한 GTD111DS 초합금 용접부의 미세조직과 기계적 성질)

  • Lee, Tack-Woon;Yang, Sung-Ho;Kim, Sang-Hun
    • Proceedings of the KWS Conference
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    • 2009.11a
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    • pp.108-108
    • /
    • 2009

  • Precipitation hardening nickel base alloys strengthened by intermetallic compounds are extensively used to manufacture on the components of the hot section of gas turbine engines. To ensure structural stability and maintenance of strength properties for a long time, nickel alloys are normally subjected to complex alloying with elements to form ${\gamma}'$(gamma prime). Such alloys have a limited weldability, are normally welded in high temperature. However, laser welding have a merit that applies in room temperature as easy control of welding parameter and heat input. In this study, $CO_2$ laser welding is applied on STS304 plate with good ductility and precipitation hardening nickel base alloy (GTD111DS) used blade material. Also, several welding parameters are applied on powder, power and travel speed. There are no cracks in Rene 80 and IN 625 powder when STS304 plate is used. But IN 625 powder has no cracks and Rene 80 have some cracks in welds with GTD111DS substrate. Adjusting of welding parameter is tried to apply Rene 80 having a good strength compare to IN 625. In the result of adjusted welding parameter, optimized welding parameters are set with low power, low feed rate and high welding speed. Tensile strength of GTD111DS substrate with Rene 80 powder is same and over than the one of base metal in room temp and high temp($760^{\circ}C$).

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