### Effects of Heat Input on Microstructure and Mechanical Properties of Laser-Welded Mg-Rare Earth AlloyEffects of Heat Input on Microstructure and Mechanical Properties of Laser-Welded Mg-Rare Earth Alloy

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 Author Dai, Jun ♦ Huang, Jian ♦ Li, Zhuguo ♦ Dong, Jie ♦ Wu, Yixiong Source SpringerLink Content type Text Publisher Springer US File Format PDF Copyright Year ©2012 Language English
 Subject Domain (in DDC) Technology ♦ Engineering & allied operations Subject Keyword heat input ♦ laser welding ♦ Mg-rare earth alloy ♦ microstructure ♦ NZ30K ♦ Characterization and Evaluation of Materials ♦ Tribology, Corrosion and Coatings ♦ Quality Control, Reliability, Safety and Risk ♦ Engineering Design Abstract The effects of heat input on the quality of laser-welded Mg-rare earth alloy NZ30K were studied. Using a 15-kW high-power CO$_{2}$ laser, the microstructure and mechanical properties of welded joints under different heat inputs had been analyzed and tested. It is found that the welding heat input plays an important role in laser welding of NZ30K. Good welded joint without macroscopic defects can be obtained using the proper heat input. With the increasing heat input, welding penetration gets deeper, the width of the heat-affected-zone becomes larger, and the distribution of precipitates changes concentration. Tensile tests display that the ultimate tensile strength (UTS) of the welded joint tends to increase at first with the increasing heat input. After the welded joint gets full penetration, the UTS remains almost the same, although the heat input is increased. ISSN 10599495 Age Range 18 to 22 years ♦ above 22 year Educational Use Research Education Level UG and PG Learning Resource Type Article Publisher Date 2012-03-21 Publisher Place Boston e-ISSN 15441024 Journal Journal of Materials Engineering and Performance Volume Number 22 Issue Number 1 Page Count 7 Starting Page 64 Ending Page 70