Investigations on Laser-TIG Hybrid Welding of Magnesium Alloys

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This paper presents results of recent investigations on the weldability of several wrought (AZ31, AZ61) and cast magnesium-based alloys (AZ91) by laser-TIG welding process. The investigations showed that magnesium alloys can be easily welded by laser-TIG welding. The grain of the fusion zone was finer than that of in base metal. The width of the heat-affected zone welded by laser-TIG welding process was obviously narrower than that of welded by TIG. Besides, with the Al content of magnesium alloys increasing, the width of the heat-affected zone (HAZ) was increased,as well as the content of β phase(Mg17Al12). The hardness in the fusion zone (FZ) and in HAZ of AZ61 and AZ91 has a large change to the base metal due to the existing of β phase, while no change relative for AZ31. It results from above discussing that laser-TIG welding is an excellent welding process for magnesium alloys.

Info:

Periodical:

Materials Science Forum (Volumes 488-489)

Edited by:

W.Ke, E.H.Han, Y.F.Han, K.Kainer and A.A.Luo

Pages:

371-376

Citation:

G. Song et al., "Investigations on Laser-TIG Hybrid Welding of Magnesium Alloys", Materials Science Forum, Vols. 488-489, pp. 371-376, 2005

Online since:

July 2005

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$38.00

[1] Song, Gang., Liu, Liming. and Wang, Jifeng: Transactions of the China Welding Institution, Vol. 25, No. 3, pp.31-34, June (2004).

[2] Liu, Liming., Song, Gang., Wang, Jifeng. and Liang, Guoli: Trans. Nonferrous Met. Soc. China, Vol. 14, No. 3, June (2004).