铜铝管时焊机原设计电路采用时间继电器控制焊接参数．由于时间继电器控制精度不够，使用时焊接参数不易保持稳定状态．改用可编程序控制器进行逻辑程序控制，大大提高了铜铝管对焊机的定时精度和工作可靠性，使其具有预调谐和预显示功能，增加了该机的技术含量，使其在国内外同类机中具有领先地位． Copper-aluminum tube welding machine when the original design of the circuit using time relay control of welding parameters. As time relay control accuracy is not enough, the use of welding parameters is not easy to maintain a stable state. Switch to programmable logic controller logic controller, greatly improving the timing of copper and aluminum tube welding machine reliability and reliability, it has pre-tuning and pre-display function, an increase of the technical content of the machine to make it in the Domestic and foreign similar machine has a leading position.