10/04 COVER 1 zaida

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Specifications	10/04 COVER 1 zaida
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WELDING RESEARCH OCTOBER 2004-S282 Conclusions The authors applied friction stir weld- ing in order to join an aluminum alloy

Specifications	10/04 COVER 1 zaida
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Content	WELDING RESEARCH OCTOBER 2004-S282 Conclusions The authors applied friction stir weld- ing in order to join an aluminum alloy containing magnesium to steel. In this study, the effects of pin rotation speed and pin offset toward the steel faying sur- face on the tensile strength and the struc- ture of a joint were investigated. The fol- lowing results were obtained. 1) Adjusting a rotating pin position to activate the faying surface of the steel en- abled a joint to be produced between steel and an aluminum alloy. Welds were pro- duced by placing the aluminum alloy on the retreating side of the joint. 2) There was an optimum rotation speed for the pin to make a sound joint. A lower rotation speed gave rise to an insuf- ficient increase in temperature at the weld, so that the pin wore out in a short time. At a higher rotation speed, the tem- perature increase was so excessive that the magnesium in the Al alloy oxidized and resulted in an unsound joint. 3) The maximum tensile strength of the joint was obtained at the pin offset of 0.2 mm toward steel. At a larger offset, steel pieces scattering in the aluminum alloy matrix became larger in size and some voids were formed, resulting in a de- crease in joint tensile strength. 4) Intermetallic compounds were not observed at the interface between the steel and the aluminum alloy. However, some intermetallic compounds were ob- served at the upper region of the weld where the temperature was higher due to the additional heat generated by the ro- tating tool shoulder. The intermetallic compounds formed at the upper region of the Fe/Al interface deteriorated the joint strength. 5) A minimum pin size was required to produce a weld. Pins that were too small in diameter, i.e., 1 mm diameter, could not produce a weld. Pin diameters from 2 to 4 mm showed similar joint tensile strength. 6) Welds could not be produced when the pin was rotated counterclockwise, i.e., the aluminum plate was mounted on the advancing side. References 1. Maruzen. 1990. Welding Handbook. Edited by Japan Welding Society: pp. 496 2. Aritoshi, M., and Okita, K. 2002. Friction welding of dissimilar metals. J. of Japan Weld- ing Society71-6(2002): 432–436. 3. Watanabe, T., and Yoneda, A., et al. 1999. A study on ultrasonic welding of dissimilar met- als, 1st and 2nd reports. Quarterly J. of Japan Welding Society17-5(1999): 223–242. 4. Kouno. 2002. Manufacture of Al/SUS clad by vacuum rolling joining method and its properties. J. Japan Welding Society71-6(2002): 427–431. 5. Katayama, S. 2002. Dissimilar materials joining by laser. Welding Technology50-2(2002): 69–73. 6. Thomas, W. M., et al. Friction stir weld- ing, international patent application PCT/GB92/02203. 7. Watanabe, T., Takayama, H., and Kimapong, K. 2003. Joining of steel to alu- minum alloy by interface-activated adhesion welding. Materials Scienceforum, 426- 432(2003): 4129–4134. 8. Yoshikawa, K., and Hirano, T. 2001. Nu- merically controlled friction stir welding in lay- ered dissimilar metal materials of aluminum and steel. Proceedings of the Third Symposium on Friction Stir Welding, Kobe, Japan, Septem- ber, pp. 1–11. 9. Binary Alloy Phase Diagrams, second edi- tion, 1996. CD-ROM. Materials Park, Ohio: ASM International. 10. Ulysse, P. 2002. Three-dimensional modeling of the friction stir welding process. International Journal of Machine Tools & Man- ufacture42(2002): 1549–1557. Fig. 15 — SEM photographs showing steel faying surfaces before and after welding when the welding direction was reversed: A — before welding; B — after welding with an offset of 0.2 mm; and C — after welding with an offset of 0.4 mm. Fig. 16 — Schematic illustration showing plastic flow direction of alu- minum for aluminum-to-steel FSW: A — clockwise pin rotation of a pin; B — counterclockwise pin rotation. ABC AB HOTTEST WELDINGBOOKS ON THE WEB www.aws.org/catalogs ARE YOU UP TO STANDARD? www.aws.org/catalogs CLICK FORCODE SECRETS www.aws.org/catalogs Kimapong Supp for 10/04corr 8/25/04 3:35 PM Page 282
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Following Datasheets	10-2004-MURUGANANTH-s (10 pages) 10-2004-WANG-s (5 pages) 10-2005-JENKINS-s (8 pages) 10-2005-POORHAYDARI-s (7 pages) 10-50TV_IPC-1752 (3 pages) 10-50TV_097_Rev_A (2 pages) 10-50TVC_IPC-1752 (3 pages) 10-50TVC_097_RevA (2 pages) 10-50TVC-S_IPC-1752 (1 pages) 10-50TVC-S_097_RevC (2 pages)
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