JOURNAL BROWSE
Search
Advanced SearchSearch Tips
Friction Welding and AE Characteristics of Magnesium Alloy for Lightweight Ocean Vehicle
facebook(new window)  Pirnt(new window) E-mail(new window) Excel Download
 Title & Authors
Friction Welding and AE Characteristics of Magnesium Alloy for Lightweight Ocean Vehicle
Kong, Yu-Sik; Lee, Jin-Kyung; Kang, Dae-Min;
  PDF(new window)
 Abstract
In this paper, friction welded joints were constructed to investigate the mechanical properties of welded 15-mm 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 materials (271 MPa) was increased to about 100% of the AZ31B base metal (274 MPa) under the condition of a heating time of 1 s. The metal loss increased lineally with an increase in the heating time. The following optimal friction welding conditions were determined: rotating speed (n) = 2000 rpm, heating pressure (HP) = 35 MPa, upsetting pressure (UP) = 70 MPa, heating time (HT) = 1 s, and upsetting time (UT) = 5 s, for a metal loss (Mo) of 10.2 mm. 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 optimum 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.
 Keywords
Friction welding;Base metal (BM);Heat affected zone (HAZ);Welding condition;Mg alloy;AE count;Energy;
 Language
Korean
 Cited by
 References
1.
Cho, H.S. and Suh, S.J. (1997). "Friction Welding of Inconel 713C and SCM440", Journal of KWS, Vol 15, No 6, pp 78-84.

2.
Ferrer, F., Faure, T., Goudiakas, J. and Andres, E. (2002). "Acoustic Emission Study of Active-passive Transitions During Carbon Steel Erosion-corrosion in Concentrated Sulfuric Acid", Corrosion Science, Vol 44 No 7, pp 1529-1540. crossref(new window)

3.
Jeong, H.S. and Shinoda, T. (1997). "Fundamental and Basic Application of Friction Welding", Journal of KWS, Vol 15, No 6, pp 1-12.

4.
Kang, S.B. and Min, T.K. (1988). "A Study on The Friction Weldability of Carbon Steel (S45C) to Aluminum Alloy (A6063)", Journal of KWS, Vol 16, No 2, pp 153-220.

5.
Kong, Y.S. and Kim, S.J. (2006). "Mechanical Properties of Dissimilar Friction Welded Steel Bars in Relation to Post Weld Heat Treatment", Trans. of the KSME (A), Vol 30, No 4, pp 402-408. crossref(new window)

6.
Susic, E. and Grabec, I. (2000). "Characterization of The grinding Process by Acoustic Emission", International Journal of Machine Tools & Manufacture, Vol 40 No 2, pp 225-238. crossref(new window)

7.
강민철 (2003), "한국마그네슘합금산업의 현황과 전망", 부품소재논문학회지, pp 32-35.

8.
공유식, 윤성필, 김선진 (2010-A). "자동차 후진기어용 축재(SM-45C-SF45)의 이종마찰용접 특성", 대한기계학회논문집 A권, 제34권, 제1호, pp 85-90. crossref(new window)

9.
공유식, 천봉근, 강대민 (2010-B). "AZ31 마그네슘합금의 마찰 접합특성", 한국소성가공학회지, 제19권, 제5호, pp 277-282.

10.
신형섭, 정윤철, 최광 (2011). "마그네슘합금(AZ31B) 판재의 마찰교반 점용접시 접합특성에 미치는 툴속도의 영향", 대한용접.접합학회지, 제29권, 제2호, pp 80-87.

11.
오세규, 김부안, 김선진, 남상훈 (1988). "S45C와 SCM4의 마찰용접 및 피로특성에 관한 연구", 한국해양공학회지, 제2권, 제2호, pp 312-321.

12.
이배섭, 공유식, 김선진 (2005). "해양차량 쇽업소버용 강재의 이종 마찰용접과 AE 평가", 한국해양공학회지, 제19권, 제1호, pp 44-48.

13.
최상원 (2008), 자동차 경제; 자동차 경량화 동향, pp 37-47.