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我厂有两台50年代建厂初期从苏联引进的MT-25型25 kVA的交流点焊机,其电气原理如图(左边部分)所示。由图可知它是由三部分组成的,(1)是变压器。(2)是调节电流级数的接点,有Ⅰ、Ⅱ和1、2、3、4接点,可调节1～8级。次级电压为1.9～3.62V。(3)是接触片,利用接触片的接触和断开,可使焊接电流一通一断,完成焊接工作。但是不能调节焊接时间,焊接时间的长短完全凭点焊工人向下踏脚的速度大小来决定。这样在焊接同样厚度的金属板时,虽然采用
Our plant has two MT-25 25 kVA AC spot welders introduced from the Soviet Union in the early 1950s. The electrical principle is shown in the figure (left part). It can be seen from the figure that it is composed of three parts, (1) is the transformer. (2) is to adjust the current series of contacts, there are Ⅰ, Ⅱ and 1,2,3 contacts, adjustable 1 to 8 levels. The secondary voltage is 1.9 ~ 3.62V. (3) is the contact piece, the contact piece contact and disconnect, the welding current can be broken, to complete the welding work. However, the welding time can not be adjusted. The welding time depends on the speed at which the spot welder steps down. This welding the same thickness of the metal plate, although the use