AG 型直流弧焊机是现代工业生产中常用的焊接设备。该种焊机是用交流电动机做驱动机,它的调节分为两步:第一步是调节发电机的激磁电流,使发电机有一定的电压输出;第二步是改变电刷位置来跟踪由于焊接电流的变化而造成的发电机磁极中性的位移。焊接工作中,由于焊件的多样性,焊接电流要频繁的改变,这尤其在高空作业时,给焊工带来极大不便;同时机组在空载时也 AG DC arc welding machine is commonly used in modern industrial welding equipment. This type of welding machine is to use an AC motor drive, its regulation is divided into two steps: The first step is to adjust the generator excitation current, the generator has a voltage output; The second step is to change the brush position to track Neutral displacement of generator poles due to changes in welding current. Welding work, due to the diversity of welding parts, welding current to be changed frequently, especially in the high-altitude operations, to bring great inconvenience to the welder; at the same time when the unit is also empty