6σ를 이용한 정밀 저항 용접기의 출력 안정성 평가

Many factors, such as welding current, welding time, force, electrode shape, the output stability of a welding machine, are closely related with micro spot series welding. Of those factors, the output stability evaluation of the welding machine would be checked first. In this study, we applied 60 to evaluation for the output stability of the welding machine. We estimated output stability and control stability of the welding machine by using Cp(process capability), Ppk and 4-block diagram. Therefore the problem was solved in micro spot series welding process and the problem of output control in welding machine by 6σ tool.