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http://dx.doi.org/10.21289/KSIC.2019.22.2.191

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

Kong, Yu-Sik (Dept. of Mechanical Engineering, Pukyong National Univ.)
Lee, Jin-Kyung (Division of Mechanical, Automobile and Robot Component, Dongeui University)
Publication Information
Journal of the Korean Society of Industry Convergence / v.22, no.2, 2019 , pp. 191-199 More about this Journal
Abstract
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.
Keywords
Friction Welding; Heating Time(HT); Upsetting Time(UT); Acoustic Emission(AE); AE Parameter;
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