Which welding cost is lower, two welding machines or DC welding machines?

The cost of DC welding machine is low, depending on what is welded. After secondary welding, there is no welding slag, which is beautiful in appearance and generally does not need polishing.

Covered electrode for electric welding machine is very cheap, and it doesn't need shielding gas, but there is welding slag to be removed after welding. There are many grades of welding machines to choose from, and the welding machine itself is cheaper than two welding machines.

One or two welding machines

The second kind of welding machine is short for carbon dioxide shielded welding machine. The input voltage of the second low-power welding machine is generally 220 volts AC, and the power supply is 380 volts AC. The output voltage is generally 12-36V. Mainly used for low-carbon steel and low-alloy high-strength steel, with high welding productivity, and can be used for welding thin and medium plates.

Second, DC welding machine

Electric welding machine is to use the high-temperature arc generated when the positive and negative electrodes are short-circuited, to melt the solder on the electrode and the material to be welded, so as to combine the contacted materials. Its structure is very simple, it is a high-power transformer. Welding machines can be generally divided into two types according to the types of output power, one is AC power supply and the other is DC power supply. They use the principle of inductance, which will produce a huge voltage change when it is turned on and off, and use the high-voltage arc generated when the positive and negative electrodes are short-circuited instantly to melt the solder on the electrode, thus achieving the purpose of atomic bonding.