Reducing the Rate of Defective to Improve a Welding Condition -Based on Six Sigma Process-

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Journal of Korean Society for Quality Management > Volume 31(1); 2003 > Article

Journal of Korean Society for Quality Management 2003;31(1): 123-.

용접조건 개선으로 불량률 감소 -6시그마 프로세스를 중심으로-

박진영

(주)서비스전략경영연구소

Reducing the Rate of Defective to Improve a Welding Condition -Based on Six Sigma Process-

ABSTRACT

This paper considers a six sigma project for reducing the defects rate of the welding process in manufacturing firms. The project follows a disciplined process of five macro phases. define, measure, analyze, improve and control(DMAIC). The need of customers is used to identify critical to quality(CTQ) of project. And a process map is used to identify process input factors of CTQ. Four key process input factors are selected by using an input factor evaluation of teams; an interval of welding, an abrasion, an electric current and a moving freely. DOE is utilized for finding the optimal process conditions of the three key process input factors. Another one key input factor improved to welding machine. The six sigma level of defects rate becomes a 2.01 from a 1.61 at the beginning of the project.

Key Words: CTQ;DMAIC;DOE;Process map;Sigma level;Six Sigma;