In order to meet the welding requirements of different materials and thicknesses, the welding current can be adjusted from several tens of amps to several hundred amps, and the required current value can be arbitrarily adjusted according to the thickness of the workpiece and the diameter of the electrode used. The current adjustment is generally divided into two levels: the first level is the coarse adjustment, and the connection method of the output line head (I position connection or II position connection) is often changed, thereby changing the number of turns of the inner coil to realize the adjustment of the current range. It should be carried out under the condition of cutting off the power to prevent electric shock; the other level is fine adjustment, which is commonly used to change the "movable iron core" (moving iron core type) or "movable coil" (moving coil type) in the electric welder. The position is used to achieve the required current value. The fine adjustment operation is realized by rotating the handle. When the handle rotates counterclockwise, the current value increases, the current decreases when the handle rotates clockwise, and the fine adjustment should be performed under no-load condition. The range of coarse and fine adjustment of various types of welding machines can be found on the label.
The electric welder uses the high-temperature arc generated by the positive and negative poles in an instantaneous short-circuit to melt the solder and the material to be welded on the electrode to achieve the purpose of combining them. The structure is very simple, it is a high-power transformer. The welding machine can be divided into two types according to the type of output power, one is AC power; the other is DC. Maintenance and maintenance should not be underestimated during the use of the welder.