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1.The secondary is direct current return foutines.small inductance ,its power factor is higher than that of other similar welding machine.

2.Direct current heating can avoid of heat energy loss resulted from the decreasing in AC amplitude,and prevent sparking as of over current at peak value.

3.No alternation electromagnetic force between the two polar arms can ensure steady polar pressure.

4.Balance three-pharse has no effect on electric net,hence the energy sacing substantially.

5.Besides welding general material, it's suitable for welding multi-layers steel sheetm,

over 4mm+4m aluminum product,and aluminum alloy,achieving good welding result.