마찰교반접합의 공정변수가 AA2219-AA2195 이종 알루미늄 접합에 미치는 영향

노국일; 유준태; 윤종훈; 이호성; Kookil No; Joon-Tae Yoo; Jong-Hoon Yoon; Ho-Sung Lee

Korean Journal of Materials Research, Vol.27, No.6, 331-338, June, 2017

DOI10.3740/MRSK.2017.27.6.331 Export Citation

마찰교반접합의 공정변수가 AA2219-AA2195 이종 알루미늄 접합에 미치는 영향

Effect of Process Parameters on Friction Stir Welds on AA2219-AA2195 Dissimilar Aluminum Alloys

노국일¹, 유준태², 윤종훈², 이호성^{1, 2, †}

¹과학기술연합대학원대학교 항공우주시스템공학전공
²한국항공우주연구원 발사체구조팀

Kookil No¹, Joon-Tae Yoo², Jong-Hoon Yoon², and Ho-Sung Lee^{1, 2, †}

¹Department of Aerospace System Engineering, University of Science & Technology, Daejeon 34113, Republic of Korea
²Launcher Structure & Materials Team, Korea Aerospace Research Institute, Daejeon 34113, Republic of Korea

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This study was carried out to investigate the optimum condition of a friction stir welding process for a joint of AA2219-T87 and AA2195-T8 dissimilar aluminum alloys. These alloys are known to have good cryogenic properties, and as such to be suitable for use in fuel tanks of space vehicles. The welding parameters include the travelling speed, rotation speed and rotation direction of the tool. The experiment was conducted under conditions in which the travelling speed of the tool was 120-300 mm/min and the rotation speed of the tool was 400-800 rpm. To investigate the effect of the rotation direction of the tool, the joining was performed by switching the positions of the two dissimilar alloys. After welding, the microstructure was observed and the micro-hardness were measured; non-destructive evaluation was carried out to perform tensile tests on defect-free specimens. The result was that the microstructure of the weld joint underwent dynamic recrystallization due to sufficient deformation and frictional heat. The travelling speed of the tool had little effect on the properties of the joint, but the properties of the joint varied with the rotation speed of the tool. The conditions for the best joining properties were 600 rpm and 180-240 mm/min when the AA2219-T8 alloy was on the retreating side(RS).

Keywords:friction stir welding;AA2219;AA2195;microstructure;mechanical property

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[1] Reed RP, Purtscher PT, Simon NJ, McColskey JD, Aluminum Alloys for ALS Cryogenic Tanks, NIST Boulder Co. (1991).

[2] Noble B, Harris SJ, Dinsdale K, J. Mater. Sci., 17, 461 (1982)

[3] Hou KH, Baeslack WA, J. Mater. Sci. Lett., 15(3), 208 (1996)

[4] Payton L, “Metal cutting theory and friction stir welding tool design”, Marshall Space Flight Center (2002).

[5] Handbook of Aluminum: Volume 2: Alloy Production and Materials Manufacturing, Ed. By G. E. Totten and D. S. MacKenzie, Marcel Dekker, Inc., Basel, Switzerland, 596 (2003).

[6] Muhsin JJ, Tolephih MH, Muhammed AM, ARPN J. Eng. Appl. Sci., 7, 436 (2012)

[7] Commin L, Dumont M, Masse JE, Barrallier L, Acta Mater., 57, 326 (2009)

[8] Lee HS, Lee YR, Min KJ, MATEC Web Conf., 45, 01003 (2016)

[9] No K, Yoo JT, Yoon JH, Lee HS, Appl. Mech. Mater., 863, 3 (2017)

[10] Agglian M, Anbukkarasi R, Venkateswran T, Panicker PG, Kailas SV, Sivakumar D, Pant B, Mater. Sci. Forum, 830, 274 (2015)