Mapping of defects which defines the zones and conditions convenient for occuring of defects has been presented for the wire rod mill. Variance introduced into the analysis made on data obtained in passive experiment i.e. results of production allowed to determine, which of tested factors such as the grade or diameter of wire rod (degree of processing) have significant effect on the quality. The presented analysis is not too expensive and seems to be a useful tool for constant evaluation of production departments and larger technological and administrative structures as well as realization of companies' procedures and strategies.
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