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AZ61 필러 와이어를 첨가한 AZ31B-H24 마그네슘 합금의 레이저 용접
류충선,방국수,이목영,장웅성,Ryu, Chung-Sun,Bang, Kook-Soo,Lee, Mok-Young,Chang, Woong-Sung 대한용접접합학회 2008 대한용접·접합학회지 Vol.26 No.6
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 $400{\times}500{\times}1.3mm$ 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 $200{\sim}350^{\circ}C$, fracture location of tensile specimen was shifted from weld metal to base metal, indicating less softening of weld metal than base metal.