Is it necessary to adjust the voltage of the welding machine why

The necessity of regulating the voltage of an electric welding machine is to control the width and depth of the weld. The current controls the depth of the weld, while the voltage controls the width of the weld. Lower voltage, the head of the welding torch will feel hard, strong vibration and explosion sound, resistance when moving the torch, the wire will be a lot of spatter. When the voltage is too high, the head of the welding torch will be too soft, almost no vibration, the wire floats above the molten pool, forming a large molten ball, but also a large molten droplet spatter. Only by matching the voltage and current, the arc can burn stably, emitting a small nuisance sound, and the head of the welding torch vibrates slightly, with moderate hardness and softness. At this time, the swing of the voltmeter does not exceed 5V, the swing of the ammeter does not exceed 30A, and there should be no vibration at the handle. The adjustment of voltage is essential for controlling the quality and stability of the weld.