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http://dx.doi.org/10.21289/KSIC.2019.22.5.491

Evaluation on Dynamic Behavior of Friction Welded Joints in Alloy718 to SCM440 using Acoustic Emission Technique  

Kim, Dong-Gyu (Department of Mechanical & Shipbuilding Convergence Engineering, Pukyong National University)
Kong, Yu-Sik (Department of Mechanical Engineering, Pukyong National University)
Lee, Jin-Kyung (Division of Mechanical, Automobile and Robot Component Engineering, Dongeui University)
Publication Information
Journal of the Korean Society of Industry Convergence / v.22, no.5, 2019 , pp. 491-497 More about this Journal
Abstract
Dissimilar friction welding were produced using 15 mm diameter solid bar in superalloy(Alloy718) to chrome molybdenum steel(SCM440) to investigate their mechanical properties. Consequently, optimal welding conditions were n=2000 rpm, HP=60 MPa, UP=120 MPa, HT=10 sec and UT=10 sec when the metal loss(Mo) is 3.5 mm. Acoustic Emission(AE) technique was applied to analyze the dissimilar friction welding of Alloy718 and SCM440. The relationship between the AE parameters and dissimilar friction welding of both material was discussed. In the case of heating time of 6 sec, 10 sec, 14 sec and 20 sec, 5 AE events per 0.5 seconds and energy about $2.7{\times}10^{10}$ were exhibited in heating time. In upsetting time, resulting in various numbers of events per second and very low energy. The frequency range of the signal generated during the heating time was about 200 kHz. However, the upsetting time resulted in a wide range of signals from very low frequency to high frequency of 500 kHz due to rapid plasticity of the material.
Keywords
Friction Welded Joints; Heating Pressure(HP); Upsetting Pressure(UP); AE Technique; Events; Frequency;
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Times Cited By KSCI : 1  (Citation Analysis)
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