Welding Transformer Current Control Core Adjusting Method

Welding Transformer Current Control Core Adjusting Method

Introduction:- There are various types of welding transformers available. Single phase light duty for small fabrication work to large size for industrial work. Single phase transformer are light in weight and generally rated for 200 A welding current. There are few tapping in secondary winding for different current like 100, 125, 150 etc. These transformers work at 230 volt single phase supply.
Four heavy duty use transformers of higher rating comes in different sizes. These transformers input supply voltage is two phase 400 volt. Output current rating is 300 to 600 Amps. There are three points  on output side Common, Low and High. Common is connected to ground and welding lead is connected to low for up to 300 amps current and high for 300 to 600 Amps current. Open circuit out put voltage of welding transformer is nearly 90 volt while during welding it reduces to 50-60 volts. The primary and secondary winding uses strip conductor for winding. Primary winding have tapping for connection to 380 volt or 415 volt by jumper strip setting.

Current adjustment system:- When supply is given to primary winding it produces an alternating flux in the core. The secondary winding which is also wound on the same core linkage with the flux produces by primary winding. So voltage is induced in secondary winding and hence the welding current while welding. So to control the current we have to control the flux linkage to the secondary winding.

For that a by pass magnetic path is provided for flux with the help of adjustable magnetic core as shown in diagram. This core by passes the magnetic flux so flux linkage with secondary winding reduces which controls output current.this adjustable magnetic core slide up down in between the main core with the help of a current controlling handle.
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