한국산업융합학회 논문집 (Journal of the Korean Society of Industry Convergence)

  • 제22권2호
  • /
  • Pages.191-199
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  • 2019
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  • 1226-833X(pISSN)
  • /
  • 2765-5415(eISSN)
한국산업융합학회 (The Korean Society of Industry Convergence)
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이종마찰용접재의 최적용접조건과 음향방출에 의한 실시간 품질평가

Optimal Welding Condition of Dissimilar Friction Welded Materials and Its Real Time Evaluation by Acoustic Emission

  • 공유식 (부경대학교 기계공학과) ;
  • 이진경 (동의대학교 기계자동차로봇부품공학부)
  • Kong, Yu-Sik (Dept. of Mechanical Engineering, Pukyong National Univ.) ;
  • Lee, Jin-Kyung (Division of Mechanical, Automobile and Robot Component, Dongeui University)
  • 투고 : 2018.11.20
  • 심사 : 2019.03.12
  • 발행 : 2019.03.31
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초록

In this paper, dissimilar friction welding were produced using 15 mm diameter solid bar in chrome molybedenum steel(SCM440) to stainless steel(STS316L) to investigate their mechanical properties. Consequently, optimal welding conditions were n=2000 rpm, HP=70 MPa, UP=140 MPa, HT=10 sec and UT=10 sec when the metal loss(Mo) is 8.6 mm. In addition, an acoustic emission technique was applied to evaluate the optimal friction welding condition. AE parameters including the cumulative count, amplitude and energy showed a various changes according to the friction condition. A continuous type waveforms and low frequency spectrum was presented in friction time. On the other hand, a burst type waveform and high frequency spectrum was exhibited in pressing time.

키워드

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Fig. 1 Friction welding machine

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Fig. 2 Schematic diagram of AE technique

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Fig. 3 Relationship between tensile strength and pressure of as-welded specimens

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Fig. 4 Relationship between metal loss and heating time of as-welded specimens

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Fig. 5 Relationship between strength and heating time in the as-welded specimens

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Fig. 7 Typical waveforms at the heating and the upsetting times

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Fig. 6 Relationship between ductility and heating time in the as-welded specimens

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Fig. 8 Cumulative count according to heating times

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Fig. 9 Amplitude according to heating times

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Fig. 10 ABS energy according to heating times

Table 1. Mechanical properties of materials

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Table 2. Friction welding conditions and dimension of specimen

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참고문헌

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