Journal of Welding and Joining

The Korean Welding and Joining Society (대한용접접합학회)
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A Study on the Welding Characteristics of Hastelloy C-276 using a Continuous Wave Nd:YAG Laser

연속파형 Nd:YAG 레이저를 이용한 Hastelloy C-276의 용접특성에 관한 연구

  • Na, Gee-Dae (Dept. of Mechanical Design Engineering, Chosun University) ;
  • Yoo, Young-Tae (Dept. of Mechatronics Engineering, Chosun University) ;
  • Shin, Ho-Jun (Dept. of Precision Mechanical Engineering, Chosun University) ;
  • Oh, Yong-Seok (Dept. of Advanced Parts and Materials Engineering, Chosun University)
  • 나기대 (조선대학교 공과대학 기계설계공학과) ;
  • 유영태 (조선대학교 공과대학 메카트로닉스공학과) ;
  • 신호준 (조선대학교 일반대학원 정밀기계공학과) ;
  • 오용석 (조선대학교 일반대학원 첨단부품소재공학과)
  • Published : 2008.10.31
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Abstract

Hastelloy C-276, corrosion resistant alloy at high temperature, is used in chemical plant and power generation industry. In this study, process parameter of laser welding for welding property in Hastelloy C-276 using a continuous wave Nd:YAG laser was studied. As the result of experiment, laser welding did not show segregation or crack at heat affected zone compared to conventional GTWA welding. The melting zone showed cell dendritic structure along with welding line. In addition, planer front solidification is occurred from welding structure, and it was progressed to cellular solidification. Optimal process parameter for butt welding was 1.2kW and 2.0 m/min for laser power and welding speed, respectively. While heat input, output density, tensile stress, and longitudinal strain was $441.98{\times}103$ J/cm2, $29.553{\times}103$ W/cm2, 768 MPa, and 0.689, respectively. Lap welding of the same material showed greater discrepancy in tensile property during 1 line and 2 line welding. For 1 line welding, tensile stress was about 320 MPa, and 2 line showed slightly larger tensile stress. However, strain was decreased by 20%. From this result, lap welding of the same material, Hastelloy C-276, with 2 line welding is considered to be more effective process than 1 line welding with consideration of mechanical property.

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