A6061 알루미늄합금 판재의 맞대기 TIG용접에서 반응표면법을 이용한 최적용접조건선정에 관한 연구

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.