A welding machine rated at 500 amperes uses around 120000 watts of power. This is used in very heavy industrial applications due to its large power draw.
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Standard welder sizes are between 5 to 500 kilovolt amperes, but micro spot welders may be as small as 1.5 kilovolt amperes. They are used in many types of industries which require precision welding.
primary winding and secondary winding how this turn.
If you are talking DC voltage: 1 billion volts at 10 nano amperes is 10 watts. 1 million volts at 10 micro amperes is 10 watts. 1 thousand volts at 10 milli amperes is 10 watts. 1 volt at 10 amperes is 10 watts. So, it depends. You're comparing power to potential, which cannot be directly compared without more information (the amperage).
2 basic types, Gas shielding, and flux shielding. Gas shielding comes from compressed tanks of inert gas such as argon. these gases are pumped through the welding hose and over the weld pool. The flux type protects the weld by covering it in a layer of slag that prevent it from being contaminated by the surrounding air.
For the same power - Watts - you need to run twice as many amps at 220V than at 440V. For the same load, it'll pull half the amps at 220V than it did on 440V