 |
| Welding Transformer |
Introduction: - Welding transformers are available. Single-stage light duty for small fabric manufacturing for large-size industrial work.
Single-phase transformers are lighter in weight and are
typically rated for a 200 A welding current. There are some tapping in the
secondary winding for varying current such as 100, 125, 150, etc. These
transformers operate on a 230 volt single-phase supply.
Four heavy-duty use transformers of high rating come in
different sizes. This transformer input supply voltage is two-phase 400 volts.
The output current rating is 300 to 600 Amps. The output side common, low and
high are three points. The common ground is connected and the welding lead is
connected to low for 300 amperes current and high for 300 to 600 amps current.
The open-circuit out voltage of the welding transformer is about 90 volts while
it reduces to 50-60 volts during welding. The primary and secondary winding
uses strip conductors for winding. The primary winding is tapped for a
connection of 380 volts or 415 volts by a jumper strip setting.
Current Adjustment System
When the supply is delivered to
the primary winding it generates an alternating current in the core. Secondary
winding that is wound on the same core linkage with the flux that is produced
by the primary winding. So the voltage is induced in the secondary winding and
hence the welding current when welding. So to control the current we have to
control the flux linkage of the secondary winding.
For that, a bypass magnetic path is provided for the flux
with the help of an adjustable magnetic core as shown in the diagram. This core
passes the magnetic flux so the flux linkage decreases with the secondary
winding which controls the output current. This adjustable magnetic core slides
down the middle of the main core with the help of the current control handle.
0 Comments
Leave a Reply...