Low power mode. The output current and voltage required for welding an iron plate with a thickness of one millimeter are small, so a low-power mobile spot welder with an output current of 50A- 100A and a voltage of 2V-5V can not only ensure the welding quality, but also avoid excessive consumption of energy and materials. When welding metal plates with different thicknesses and materials, the model and parameters of mobile spot welding machine will also change.