earticle

영어

Copper clad aluminum (CCA) wire is one of the promising candidate for replacing copper wire with advantages of light weight, good conductivity, and low price. In this study, the characteristics of melting in CCA wire are investigated in order to identify the difference of CCA wire which causes fire. From the experiments on 0.75sq stranded CCA wire, it is revealed that CCA wire has inferior tensile strength and high temperature during electrical flow compared to the pure copper wire. Melted CCA samples fabricated under different conditions such as overcurrent, overcurrent with external heat, and external heat without electrical current show insignificant difference in the shape and weakness of hardness at the melting region. Because the cooling time affects to the formation of nucleation, Al-Cu alloy of the CCA, which have faster cooling time than pure metal, contains dendrite structure under overcurrent condition while the void is observed only in the sample of external heat without current. Therefore, we conclude that the cause of fire due to CCA-wire is identified by the observation of dendrite structure at the melting beads.