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Inverted DC electricity is utilised for welding when the frequency is between two. A power supply and control system that transforms AC power input into an output of higher frequency power that has been inverted is used to accomplish this. 60 Hz of AC is introduced.
The result is a 400–4000 hertz inverted DC output after it has been inverted and transformed multiple times in the control and transformer. With no zero crossovers, the weld current quickly warms the component. Because it’s DC, there won’t be any inductive power losses or issues with magnetic material in the machine’s throat.
The Global Medium Frequency Inverter Resistance Spot Welding machine market accounted for $XX Billion in 2023 and is anticipated to reach $XX Billion by 2030, registering a CAGR of XX% from 2024 to 2030.
An MFDC transformer can also refer to a medium frequency dc transformer.It is constructed of a rectifier device and a transformer coil. The resistance welding transformer’s working frequency is 1000 Hz, and its output is low voltage but high current.
The advantages of a medium frequency transformer over an ordinary power frequency transformer are greater. It has dc current as its secondary current. increased quality of solder joints. Excellent performance when welding materials like aluminium and galvanised metal due to its small size and lightweight, extended electrode life, and excellent performance.
The components of a medium frequency DC resistance welding system include the workpiece, a medium frequency inverter (MFDC inverter), and an MFDC transformer. On spot welding machines, seam welding machines, butt welding machines, etc. The resistance welding transformers are frequently utilised.
In the beginning, a rectifier converts three phase AC to DC. They can use a bridge circuit made of IGBTs to invert the DC into a fresh AC.The welding current is fed into a mid-frequency welding transformer, and the secondary of the transformer has a rectifier diode to convert the welding current to direct current (DC).
It is simpler to control the welding process and finish welding more quickly and steadily since the MF transformer’s output current is DC.As a result of the 1000Hz welding frequency, the power supply’s current regulation is more rapid and precise than with a 50Hz power source.
The secondary welding circuit uses a DC current.It significantly lessens the effect that varying work piece immersion depths have on inductive reactance in the secondary circuit, which affects welding current.
