Spot welders can be classified into DC and AC according to current. Many people don't know how to distinguish between DC spot welders and AC spot welders. Do you want to know how to distinguish them? The following editor will teach you how to distinguish them from four aspects:

1. Spot welder welding quality

The AC spot welder has a longer adjustment cycle. For a 50Hz power grid, the welding time adjustment resolution is 20ms. The time adjustment resolution of the inverter DC spot welder can reach 0.25ms (4kHz inverter frequency), and the control accuracy is high. The response speed of the feedback control of the inverter spot welder is significantly faster, and the output stability is good.

Due to the influence of excessive current, the thermal efficiency of the AC spot welder is low. When the current percentage is small, the zero-crossing time is long, and the impact is greater. The output current of the DC spot welder is pulsating DC, which is a continuous DC output under the action of the loop inductance. The thermal efficiency is high and the spot welder welding heat input is stable.

2. Spot welder welding speed

Due to the influence of current zero crossing, the heating time of the AC spot welder is relatively long. The inverter resistance spot welder has a DC output, concentrated heating, and shortened welding time.

3. Energy-saving effect of spot welder

The AC spot welder operates at 50Hz, the transformer loss is large, the welding machine power factor is low, and the loop loss is large. The inverter welding machine transformer operates at a higher frequency (1-4kHz), the loss is very small, the DC output improves the power factor, and the energy-saving effect is obvious.

4. Spot welder equipment volume and weight

The transformer core of the AC spot welder is larger, and the equipment is bulky under the same power conditions. The DC resistance spot welder transformer is greatly reduced, and the equipment is lighter.