| 摘要 |
PROBLEM TO BE SOLVED: To obtain a copper alloy resistance wire for electrofusion joint, free from spreading and short-circuit during electrification, by constituting the wire of a copper alloy wire of specific composition consisting of Zn, Ni, Fe or Co, Mn, and Cu. SOLUTION: The copper alloy resistance wire for electrofusion joint is constituted of a copper alloy wire having a composition consisting of, by weight, 15-40% Zn, 10-17% Ni, 0.51-5.0% Fe or 0.5-5.0% Co, 0.01-0.7% Mn, and the balance Cu with inevitable impurities. In this copper alloy resistance wire, volume resistivity is in the range as wide as (20 to 30)μΩ/cm on a 23 deg.C base, and primary temp. coefficient is as high as (40×10<-5> to 100×10<-5> )/K. By this method, in the case where this wire is used for electrofusion joint, the occurrence of spreading and short-circuit can be prevented even in the case of power supply from a constant voltage power unit and the occurrence of incomplete welding can be perfectly prevented. |
