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NZA2-300型钨极自动氩弧焊机上的电弧稳定器是由电子管组成,其中的关键元件ZQM1-400/3.5闸流管已不再生产。为了修复该机,我们使用3CT200型可控硅成功地替代了这种闸流管,经试用,效果良好。 NZA2-300型钨极自动氩弧焊机电弧稳定器的原理见图1,改进后的原理图见图2。当焊接电流由正极性变为反极性过零点时,信号变压器输出一正脉冲信号,在电位器W上形成脉冲电压,从而使Z_2(或3CT200)导通,电容C_1经Z_2(或3CT200)给电弧一个稳弧脉冲电压,使电弧稳定燃烧。在改进后的电路中,除了用3CT200替代了z_2以外,还增加了R_2、C_2两个元件。R_2是对来自电位器W
The arc stabilizer on the NZA2-300 TIG welding machine is composed of a tube, of which the key element ZQM1-400 / 3.5 thyristors are no longer manufactured. In order to repair the aircraft, we use the 3CT200 SCR successfully replaced the thyristor, the trial, the effect is good. NZA2-300 tungsten automatic arc welding machine arc stabilizer principle shown in Figure 1, the improved schematic shown in Figure 2. When the welding current changes from positive polarity to negative polarity zero crossing, the signal transformer outputs a positive pulse signal and a pulse voltage is formed on the potentiometer W, so that Z_2 (or 3CT200) conducts, and the capacitor C_1 passes through Z_2 (or 3CT200) Give the arc a steady arc pulse voltage, the arc stable combustion. In the improved circuit, in addition to 3CT200 instead of z_2, but also increased R_2, C_2 two components. R_2 is from potentiometer W