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In this paper, friction welded joints were constrncted to investigate the mechnnical praperties of welded 15-㎜ diameter solid bars of Mg alloy (AZ31B). The main friction welding parameters were selected to endure reliable quality welds on the basis of visual examination, tensile tests, impact energy test, Vickers hardness surveys of the bonds in the area and heat affected zone (HAZ), and macrostructure investigations. The study reached the following conclusions. The tensile strength of the friction welded nmterials (271 ㎫) was increased to about 100 % of the AZ31B base metal (274 ㎫) under the condition of a heating time of 1 s. The metal loss increased lineally with an increase in the heating time. The following aptimal friction welding conditions were determined: rotating speed (n) = 2000 rpm, heating pressure (HP) = 35 ㎫, upsetting pressure (UP) = 70 ㎫, heating time (HT) = 1 s, and upsetting time (UT) = 5 s, for a metal loss (Mo) of 10.2 ㎜. The hardness distribution of the base metal (BM) showed HV55. All of the BM parts showed levels of hardness that were approximately similar to friction welded materials. The weld interface of the friction welded parts was strongly mixed, which showed a well-combined structure of macro-particles without particle growth or any defects. In addition, an acoustic emission (AE) technique was applied to derive the aptimum condition for friction welding the Mg alloy nondestructively. The AE count and energy parameters were useful for evaluating the relationship between the tensile strength and AE parameters based on the friction welding conditions.
목차
ABSTRACT
1. 서론
2. 실험재료 및 실험방법
3. 결과 및 고찰
4. 결론
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참고문헌
참고문헌 (13)
참고문헌 신청
1. [학술지(정기간행물)] - Cho, H.S / 1997 / Friction Welding of Inconel 713C and SCM440 / Journal of KWS 15 (6) : 78 ~ 84
2. [학술지(정기간행물)] - Ferrer, F / 2002 / Acoustic Emission Study of Active-passive Transitions During Carbon Steel Erosion-corrosion in Concentrated Sulfuric Acid / Corrosion Science 44 (7) : 1529 ~ 1540
3. [학술지(정기간행물)] - Jeong, H.S / 1997 / Fundamental and Basic Application of Friction Welding / Journal of KWS 15 (6) : 1 ~ 12
4. [학술지(정기간행물)] - Kang, S.B / 1988 / A Study on The Friction Weldability of Carbon Steel (S45C) to Aluminum Alloy (A6063) / Journal of KWS 16 (2) : 153 ~ 220
6. [학술지(정기간행물)] - Susic, E / 2000 / Characterization of The grinding Process by Acoustic Emission / International Journal of Machine Tools & Manufacture 40 (2) : 225 ~ 238
2. [학술지(정기간행물)] - Ferrer, F / 2002 / Acoustic Emission Study of Active-passive Transitions During Carbon Steel Erosion-corrosion in Concentrated Sulfuric Acid / Corrosion Science 44 (7) : 1529 ~ 1540
3. [학술지(정기간행물)] - Jeong, H.S / 1997 / Fundamental and Basic Application of Friction Welding / Journal of KWS 15 (6) : 1 ~ 12
4. [학술지(정기간행물)] - Kang, S.B / 1988 / A Study on The Friction Weldability of Carbon Steel (S45C) to Aluminum Alloy (A6063) / Journal of KWS 16 (2) : 153 ~ 220
6. [학술지(정기간행물)] - Susic, E / 2000 / Characterization of The grinding Process by Acoustic Emission / International Journal of Machine Tools & Manufacture 40 (2) : 225 ~ 238
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UCI(KEPA) : I410-ECN-0101-2013-559-001436205