Journal
APPLIED SURFACE SCIENCE
Volume 247, Issue 1-4, Pages 300-306Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2005.01.162
Keywords
AZ31 magnesium alloy; laser welding; welding modes
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Magnesium alloys are being increasingly used in automotive and aerospace structures. Laser welding is an important joining method in such applications. There are several kinds of industrial lasers available at present, including the conventional CO2 and Nd:YAG lasers as well as recently available high power diode lasers. A 1.5 kW diode laser and a 2 kW CO2 laser are used in the present study for the welding of AZ31 alloys. It is found that different welding modes exist, i.e., keyhole welding with the CO2 laser and conduction welding with both the CO2 and the diode lasers. This paper characterizes welds in both welding modes. The effect of beam spot size on the weld quality is analyzed. The laser processing parameters are optimized to obtain welds with minimum defects. (c) 2005 Elsevier B.V. All rights reserved.
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