The increase of the preheating and liquid copper temperature of copper clad steel wires makes the cladding ratiodown and the remelting time short.
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。
2
The welding current, arc voltage, preset current, the period and ratio of pulse, base current, down slope time, gas pre and post flow time are sampled, calculated and controlled by microprocessor.
A group of experiments show that the increasing of hot end length will increase cooling downtime, cold tip temperature and hot end temperature evidently, but pressure ratio will decreases.