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A6061 알루미늄합금 판재의 맞대기 TIG용접에서 반응표면법을 이용한 최적용접조건선정에 관한 연구
정성훈(Sunghun Jung),이도엽(Doyup Lee),김봉율(Bong Ueoul Kim),이목영(Mokyoung Lee) 대한용접·접합학회 2018 대한용접·접합학회지 Vol.36 No.3
In this study, aluminum alloy sheet was welded on I-butt joint using AC type TIG welding machine. Welding conditions were designed with CCD(Central Composite Design) method in which input variables were welding current and travel speed. TIG welding was done on A6061 alloy sheet for the welding conditions at Ar shielding. The second-order regression equation was obtained using Minitab R18 with the bead shape measured from TIG welded samples. The optimum weld bead shape selected from the surface response graphs was effective penetration depth 1.78mm, upper bead width 5.36mm and sagging 0.39mm. And the correspond welding condition was welding current 115A and travel speed 5.7m/min. The reliability of the calculated regression equation for bead shape was varied from 90% of sagging to 98.7% of upper bead width.
A6061 알루미늄합금 판재의 TIG 용접에서 실험계획법에 의한 최적용접조건의 선정에 관한 연구
정성훈(Sunghun Jung),이도엽(Doyup Lee),김봉율(Bong Ueoul Kim),이목영(Mokyoung Lee) 대한용접·접합학회 2018 대한용접·접합학회지 Vol.36 No.3
In this study, aluminum alloy sheets were welded on bead-on-plate using AC type TIG welding machine. Penetration depth and bead width were selected as quality factors of weld bead. Welding conditions were designed with BBD(Box-Benhken Design) method in which the input variables were welding current, arc length and travel speed. TIG welding was done on A6061 alloy sheet for the welding conditions selected by DOE at Ar shielding. The second-order regression equation was obtained using the bead shape measured from TIG welded samples. Verification test was done at the optimum welding condition determined by the surface response diagram derived from the regression equation. The optimum welding condition was welding current 110A, arc length 1.4mm and travel speed 9.6mm/s. The penetration depth and the bead width formed at the predicted optimum welding condition were 1.97±0.010mm and 4.65±0.051mm. From the result, the regression equation matched with real TIG welding in accuracy 98.5% and 96.8% for penetration depth and bead width respectively.