Iam requesting the welding transformer ppt

A welding transformer is a step down transformer that has thin primary winding with a large number of turns and its secondary has more area of cross-section and less number of turns ensuring less voltage and very high current in the secondary. The welding transformer reduces the voltage from the source voltage to a lower voltage that is suitable for welding. Usually between 15 and 45 volts. The secondary current is quit high and it may be typically 200A to 600A, but it could be much higher. The secondary may have several taps for adjusting the secondary voltage to control the welding current. The taps are typically connected to a several high-current plug receptacles or to a high-current switch. One end of the secondary is connected to the welding electrode, whereas the other end of the secondary is connected to the welding electrode, whereas the other end is connected to the pieces to be welded .If any high current flows, heat is produced due to the contact resistance between the electrode and the pieces to be welded. The generated heat melts a trip of the electrode and the gap between the two pieces is filled. Figger shows a simple welding transformer.

The impedance of welding transformer may be higher than that of the impedance of a general purpose transformer. The impedance of welding transformer may play a role in the process of establishing an arc and controlling the current. Large welding transformers are most likely to be designed for three phase input. There are many smaller transformers that are designed for single phase input.