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介绍了电焊机缺相保护及报警电路的工作原理和调试方法，实验表明该电路不仅工作可靠，反应灵敏，而且线路简单，调整容易，成本低廉，具有广泛的应用价值
The working principle and debugging method of phase loss protection and alarm circuit of welding machine are introduced. The experiment shows that the circuit not only works reliably and responds sensitively, but also has the advantages of simple circuit, easy adjustment, low cost and wide application value