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Journal of KWJS 2008;26(6):54-58.
Published online January 13, 2009.
AZ61 필러 와이어를 첨가한 AZ31B-H24 마그네슘 합금의 레이저 용접
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Laser Welding of AZ31B-H24 Mg Alloy with AZ61 Filler Wire
Chung-Sun Ryu, Kook-Soo Bang, Mok-Young Lee, Woong-Sung Chang
Abstract
  Laser welding with AZ61 filler wire was carried out to improve formability though reduction of porosity and formation of under fill bead. Optimum welding condition and mechanical properties of butt joint for 400×500×1.3mm magnesium sheets were studied. Optimal welding conditions of laser power, welding speed, and defocusing length are 1000W, 3m/min, and 2mm, respectively.
  Results of tensile test indicated that both tensile strength and elongation of specimens welded with filler wire were improved at room temperature because of reduction of porosity and under-filled bead formation in addition to the precipitation hardening and microstructure refinement by Al-Mn and Mg-Al-Zn precipitates. At elevated temperature of 200∼350℃, fracture location of tensile specimen was shifted from weld metal to base metal, indicating less softening of weld metal than base metal.
Key Words: Nd:YAG Laser welding, AZ31B-H24 mg alloy, AZ61 filler wire, Tensile properties
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