After these days of knowledge sharing, compared to many people have a certain understanding of DC welding machine and AC welding machine, but what is the difference between the two? Let's take a look:
They are all welded by short-circuit arc, but DC welding is more stable and used in demanding situations:
First, the current output by the DC welding machine does not have a "zero crossing", it is not easy to break the arc, and the arc is stable. This is its biggest advantage.
Second, the secondary voltage of the transformer has a certain peak value, and the DC welding machine has a higher no-load voltage than the AC welding machine, and it is easier to start the arc.
Third, the DC welding machine has more rectification parts than the AC welding machine, and the cost is slightly higher.