Abstract
A procedure for estimating the qualities in the crimping interface of the terminal and stranded copper conductor applying residual resistance ratio (RRR) measurements is proposed.
According to the RRR measurements of crimping interface the press oil was not detrimental to the qualities of the interface as ascertained by supplementary EPMA analysis results. Crimping conditions of the crimping interface were more sensitive to the variations of the RRR value than those of working strain conditions during the crimping process of the terminal and stranded wire.
The measurements of the RRR were also more susceptible to the variation of the electric contact qualities of the crimping interface than the measurements of the contact resistance for the specimens measured subsequently to the aging treatment of the crimping interface.
High quality of the welded interface with heat pressure was also confirmed applying the present RRR measurements.
