Transactions of the Korean Society of Machine Tool Engineers (한국공작기계학회논문집)

The Korean Society of Manufacturing Technology Engineers (한국생산제조학회)
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A Study on Mechanical Properties According to the Depth of Notch in SM20C Friction Welding Zone

SM20C 마찰용접부(摩擦鎔接部)의 노치 깊이에 따른 기계적(機械的) 성질(性質) 연구(硏究)

  • 이세경 (충남대학교 대학원 기계공학과) ;
  • 정준모 (충남대학교 대학원 기계공학과) ;
  • 박천봉 (충남대학교 교육대학원) ;
  • 민택기 (충남대학교 기계공학과)
  • Published : 2007.02.15
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Abstract

The present study examined the mechanical properties of the friction welding zone of solid and hollow shafts made with SM20C according to the depth of the notch. Friction welding was conducted at welding conditions of 2,000 rpm, friction pressure of 60MPa, friction time of 1.4 seconds, upset pressure of 100MPa, and upset time of 2.0 seconds. In the tensile strength test, the tensile strength decreased as the depth of the notch increased. Tensile strength was moderately high when the depth of the notch was 2mm. The tensile strength of the welding zone increased as the friction revolution radius increased, because the latter led to the generation of adequate friction heat. According to the hardness test, hardness likewise increased as e friction revolution radius increased. In the bending test, the bend strength of the solid shaft decreased when the depth of the notch was 0-2mm but increased when the latter was 3-5mm. With regard to the hollow shaft, the bend strength drastically decreased when the depth of the notch was 3-4mm. Upon examination it was found that the microstructure became finer when the friction revolution radius increased.

Keywords

References

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