2nd October 2019

wikipedia
13

How does an inverter welding machine work?

These designs are known as inverter welding units. They generally first rectify the utility AC power to DC; then they switch (invert) the DC power into a stepdown transformer to produce the desired welding voltage or current. The switching frequency is typically 10 kHz or higher.

Considering this, what is the meaning of 50% duty cycle?

A duty cycle is the fraction of one period in which a signal or system is active. Duty cycle is commonly expressed as a percentage or a ratio. A period is the time it takes for a signal to complete an on-and-off cycle. Thus, a 60% duty cycle means the signal is on 60% of the time but off 40% of the time.

What does the duty cycle do?

A duty cycle is the fraction of one period in which a signal or system is active. Duty cycle is commonly expressed as a percentage or a ratio. Thus, a 60% duty cycle means the signal is on 60% of the time but off 40% of the time.

How is a welding machine rated?

In general, light industrial/hobbyist welding machines have a duty cycle of 20%, medium duty 40-60%, and heavy duty 60-80%. So with a machine that provides a maximum 140 amps with a 10% duty cycle, you might see a rating of 30% at 115 amps instead.
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