Spot welding machines can be divided into DC and AC according to the current classification. Many people don’t know the difference between DC spot welding machine and AC spot welding machine. Do you want to know how to distinguish it? The editor of Shenzhen spot welding machine will teach you to distinguish it from four aspects:

　　1. Welding quality of spot welding machine

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

　　The AC spot welding machine has low thermal efficiency due to the influence of excessive current, and the current is adjusted by a thyristor. When the current percentage is too small, the zero-crossing time is long, and the impact is greater. The output current of the DC spot welding machine is pulsating DC, and it is a continuous DC output under the action of the loop inductance. The thermal efficiency is high, and the welding heat input of the spot welding machine is stable.

　　2. Welding speed of spot welder

　　The heating time of AC spot welding machine is relatively long due to the influence of current zero crossing. The inverter resistance spot welding machine adopts DC output, heating is concentrated, and welding time is shortened.

　　3. Energy saving effect of spot welding machine

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

　　4. Equipment volume and weight of spot welding machine

　　The transformer core of the AC spot welding machine is relatively large, and the equipment is bulky under the same power condition. The transformer of the DC resistance spot welding machine is greatly reduced, and the equipment is lighter.

　　Shenzhen Site Technology Co., Ltd. is a high-tech production enterprise integrating R&D, production and sales of automated welding equipment and power battery PACK line equipment. The professional technical engineering team provides customers with timely and perfect pre-sales and after-sales services.