Invert Stationary Medium-frequency (MF) Resistance Spot welder transformers
Medium-frequency (MF) transformers are a result of recent advances in resistance welding technology.
They arepowered by a transistor inverter, supplying square wave AC 500 V @ 1000 Hz which is converted
by the MF transformer to a low voltage high current AC. This low voltage AC current is rectified to DC by
a diode block built into the transformer.The higher operating frequency of an MF system allows efficient
energy conversion using a smaller and lighter transformer.Other benefits with MF transformers used in
portable and robotic welding guns are:The reactance of the welding loop only limits the upslope and down
slope of the welding current, while the peak welding current in limited only by the welding loop’s resistance.
The net result is again smaller transformer, especially when welding with large throat, high-impedance guns.
MF welding is less demanding on the plant power system. The MF inverter draws balanced line current from
all 3 phases and operates at a high power factor (0.9).With MF transformers the peak welding current almost
equals its RMS value, which helps to obtain quality welds with no splash and constantstrength even at lower
pressure.The high frequency permits much faster – 1000 times per second - process control, which again results
in better weld quality.
For all kinds of intermediate frequency, power frequency
resistance welding machine.Such as automobile welding clamp,
seam welding machine, mesh welding machine and so on.
Invert Stationary Medium-frequency (MF) Resistance Spot welder
Model : WDB-150/250/400
1.Advanced electric and electronicparts and technology areadopted to fulfill the welding of multi-layer steel plate,alloy,coated steel plate, aluminum alloy plate and projection weldingof bolts and nuts, which are hard to weld by AC weldert
2.DC welding, high heat efficiency
3,Welding current can be easily controlled to form multiplecurrent waves to adapt various welding
4.Little splash and high welding quality
5.Quick response of current control and adjustable electrode pressure fulfill special welding craft that cannot be fulfilled by AC welder
6.Minimized welding transformer
7.3-phase loads balance with high power factor and betterpower-saving