Friends, today in this article we will learn about welding transformers . I am going to give you information about all this in a very good way. So let’s start.
Welding transformer –
A welding transformer is a step-down transformer used for welding on alternating current. Welding transformers convert a weak supply current of generally 220-440 volts into a high current of 30 to 80 volts.
The secondary output current of the transformer may be controlled by tapping switches, plugs or continuous rotary switches.
To maintain the high current arc, a low power factor is kept in the transformer so that the phase angle can be obtained in voltage and ampere. This phase angle is obtained by inductive reactance.
Different values of output current can be obtained by changing the inductive reactance.
Operating Principal –
While generating an AC welding arc the current remains in alternating form but the voltage obtained is not pure alternating.
Here in Figure 1, the M point is the voltage available to generate an arc. The time taken to recover from zero voltage to the appropriate voltage to generate an arc is called the arc recovery time. This time should be very small, otherwise the cathode will cool down in this interval and will not be able to discharge as many electrons as possible. To reduce this interval, the open circuit voltage of the welding transformer is increased.
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