Weld porosity in fibre laser weld of thixomolded heat resistant Mg alloys
作者： L. Yu , K. Nakata , J. Liao
关键词:
摘要: AbstractPorosity in fibre laser welds of two thixomolded heat resistant magnesium alloys AE42 and AS41 was investigated detail, porosity formation mechanism discussed terms gas compositions porosity. It is found that the area percentage decreases with increasing welding speed, can be correlated to width weld metal. Microstructure observation composition analysis show mainly attributed micropores pre-existing base metals during melting by welding, which are formed due air entrapment thixomolding process. Hydrogen rejection Ar shielding also possible reasons for formation; however, their contribution much smaller than pores metals. Furthermore, addition rare earth element may probably decrease amount Mg welds.
sci-hub.se 参考文章(16)
X. Cao, M. Jahazi, J.P. Immarigeon, W. Wallace, A review of laser welding techniques for magnesium alloys Journal of Materials Processing Technology. ,vol. 171, pp. 188- 204 ,(2006) , 10.1016/J.JMATPROTEC.2005.06.068
C.-T. Chi, C.-G. Chao, T.-F. Liu, C.-C. Wang, Optimal parameters for low and high voltage electron beam welding of AZ series magnesium alloys and mechanism of weld shape and pore formation Science and Technology of Welding and Joining. ,vol. 13, pp. 199- 211 ,(2008) , 10.1179/174329307X227274
Liu Liming, Wang Jifeng, Song Gang, Hybrid laser–TIG welding, laser beam welding and gas tungsten arc welding of AZ31B magnesium alloy Materials Science and Engineering A-structural Materials Properties Microstructure and Processing. ,vol. 381, pp. 129- 133 ,(2004) , 10.1016/J.MSEA.2004.04.044
M. Pastor, H. Zhao, T. DebRoy, Continuous wave-Nd: yttrium–aluminum–garnet laser welding of AM60B magnesium alloy Journal of Laser Applications. ,vol. 12, pp. 91- 100 ,(2000) , 10.2351/1.521922
Jinhong Zhu, Lin Li, Zhu Liu, CO2 and diode laser welding of AZ31 magnesium alloy Applied Surface Science. ,vol. 247, pp. 300- 306 ,(2005) , 10.1016/J.APSUSC.2005.01.162
G.M. Xie, Z.Y. Ma, L. Geng, R.S. Chen, Microstructural evolution and mechanical properties of friction stir welded Mg–Zn–Y–Zr alloy Materials Science and Engineering: A. ,vol. 471, pp. 63- 68 ,(2007) , 10.1016/J.MSEA.2007.03.041
Akihiro ONO, Yasuhiro HAYAKAWA, Kazuhiro UEKI, Junji OKAYAMA, Kouichi BAN, Calibration Method for Determination of Nitrogen Content in Steel by Thermo-Conductimetry after Fusion in the Current of an Inert Gas. Analytical Sciences. ,vol. 10, pp. 393- 398 ,(1994) , 10.2116/ANALSCI.10.393
XK Xi, RJ Wang, DQ Zhao, MX Pan, WH Wang, None, Glass-forming Mg-Cu-RE (RE = Gd, Pr, Nd, Tb, Y, and Dy) alloys with strong oxygen resistance in manufacturability Journal of Non-crystalline Solids. ,vol. 344, pp. 105- 109 ,(2004) , 10.1016/J.JNONCRYSOL.2004.07.056
N. Afrin, D.L. Chen, X. Cao, M. Jahazi, Strain hardening behavior of a friction stir welded magnesium alloy Scripta Materialia. ,vol. 57, pp. 1004- 1007 ,(2007) , 10.1016/J.SCRIPTAMAT.2007.08.001
A.H. Feng, Z.Y. Ma, Enhanced mechanical properties of Mg–Al–Zn cast alloy via friction stir processing Scripta Materialia. ,vol. 56, pp. 397- 400 ,(2007) , 10.1016/J.SCRIPTAMAT.2006.10.035