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Mechanical Properties of Friction Welded SM 45C-SF 45 Joints for Automobile Reverse Idle Gear Shaft Applications

자동차 후진기어용 축재(SM 45C-SF 45)의 이종마찰용접 특성

  • Kong, Yu-Sik (School of Mechanical Engineering, Pukyong National University) ;
  • Yun, Seong-Pil (School of Mechanical Engineering, Pukyong National University) ;
  • Kim, Seon-Jin (School of Mechanical Engineering, Pukyong National University)
  • Published : 2010.01.01

Abstract

Friction welding is a common practice to join axially symmetrical parts for automobile industry applications. The shaft for automobile reverse idle gear is generally produced by forging steel, SF 45. This method is not so good because of high cost of material and production. In this study, in order to investigate the possibility of application of SM 45C to SF 45 dissimilar friction welding, the dissimilar friction welded joints were performed using 20 mm diameter solid bar in forging steel(SF 45) to carbon steel(SM 45C). The optimal friction welding parameters were selected to ensure reliable quality welds on the basis of visual examination, tensile test, micro-Virkers hardness surveys of the bond of area and optical microstructure investigations for welded joint parts. Finally, post weld heat treatment(PWHT) of the high-frequency induction hardening was performed for the friction welded specimens under the optimal welding conditions. And then, the mechanical properties were compared for as-welded and PWHT in SM 45C to SF 45.

Keywords

Friction Welding;As-Welded;Post-Weld Heat Treatment;Micro-Virkers Hardness;Heat Affected Zone

References

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