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$Cu_{54}Ni_{6}Zr_{22}Ti_{18}$ 벌크비정질 합금의 Nd:YAG 레이저 점용접 특성
김종현,이제훈,신승용,배정찬,이창희,Kim, J.H.,Lee, J.H.,Shin, S.Y.,Bae, J.C.,Lee, C.H. 한국레이저가공학회 2005 한국레이저가공학회지 Vol.8 No.2
Weldability is largely dependent on the phase evolution and the microstructure of the weld. For the weldability of the $Cu_{54}Ni_6Zr_{22}Ti_{18}$ bulk metallic glass, the crystallization affects the sensitivity of the weld to the brittle failure. In order to suppress the irreversible crystallization, Nd:YAG laser welding was chosen. The pulsed Nd:YAG laser was irradiated onto the BMG plate and the effects of the pulse shape [peak power intensity and pulse duration time] on the crystallinity were evaluated.
Cu<SUB>54</SUB>Ni<SUB>6</SUB>Zr<SUB>22</SUB>Ti<SUB>18</SUB> 벌크비정질 합금의 Nd:YAG 레이저 점용접 특성
김종현(J. H. Kim),이제훈(J. H. Lee),신승용(S. Y. Shin),배정찬(J.C. Bae),이창희(C. H. Lee) 한국레이저가공학회 2005 한국레이저가공학회지 Vol.8 No.2
Weldability is largely dependent on the phase evolution and the microstructure of the weld. For the weld ability of the Cu<SUB>54</SUB>Ni<SUB>6</SUB>Zr<SUB>22</SUB>Ti<SUB>18</SUB> bulk metallic glass, the crystallization affects the sensitivity of the weld to the brittle failure.<BR> In order to suppress the irreversible crystallization, Nd:YAG laser welding was chosen. The pulsed Nd:YAG laser was irradiated onto the BMG plate and the effects of the pulse shape [peak power intensity and pulse duration time] on the crystallinity were evaluated.
이창호(C.H Lee),송현직(H.J Soong),윤병한(B.H Yoon),김종현(J.H Kim),이광식(K.S Lee) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.10
In this paper, a co-axial type ozonizer varied with discharge gap was designed and manufactured for investigating ① discharge characteristics with variation of output voltage power supply, flow rate and gap distance ② ozone generation and solubility characteristics with variation of flow rate, gap distance and discharge power. Pure oxygen was used as process gas of the co-axial type ozonizer.
장철섭(C. S. Jang),오승규(S. K. Oh),김종현(J. H. Kim),황영택(Y. T. Hwang),이원(W. Yi) 한국정밀공학회 2004 한국정밀공학회 학술발표대회 논문집 Vol.2004 No.10월
This article discusses the use of pulse-echo ultrasonic testing for the stress analysis of adhesive bonds between metal sheets. The method is based on the measurement of the reflection wave at the metal/adhesive interface. After describing briefly the physical aspects of the phenomenon, an index is defined to detect defective zone of the joint(both for the lack of adhesive and for insufficient adhesion); the influence of the experimental variables(variable stress...) on the measurement is discussed. By means of a control experiment it is shown that Stress Variation in Adhesive Joints are separate to be distinguished. In this paper, Quantitative Nondestructive Evaluation in Adhesive Joints are evaluated together with Ultrasonic Testing and Finite Element Method.