一接头，设置在上述芯线及包覆层的首端与电源的供电线的连接处，用以包覆所述的铜绞合线与电源的供电线的电气连接的塑料罩壳。
A joint. It is set at the connection of the cover head of core with power supply wire to cover the plastic casing of electric connection of copper strand and power supply wire.
钢芯线预热温度和铜液温度的升高使包覆比下降，重熔时间缩短。
The increase of the preheating and liquid copper temperature of copper clad steel wires makes the cladding ratio down and the remelting time short.
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