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How Much Power is Consumed by a 3 Phase Welding Machine?

A 3-phase welding machine is a type of electric arc welding machine that uses three-phase alternating current (AC) to create an electric arc between the electrode and the workpiece. The electric arc melts the metal at the welding point and fuses it together. A 3-phase welding machine can produce higher quality welds than a single-phase welding machine, as it has a more stable and consistent current flow.

However, a 3 phase welding machine also consumes more power than a single-phase welding machine, as it requires three separate power lines to operate (View Three-phase Welding Machine VS. Single-phase Inverter Welding Machine). The power consumption of a 3-phase welding machine depends on several factors, such as the power rating of the machine, the duration and frequency of use, the type and thickness of the metal being welded, and the efficiency of the machine.

Megmeet three phase welding machines


To calculate the power consumption of a 3-phase welding machine, we need to know the following information:

  1. The power rating of the machine is measured in kilowatts (kW) and indicates the maximum power output of the machine. The power rating can be found on the nameplate or in the technical specifications of the machine.

  2. The duration and frequency of use are measured in hours and sessions per month, respectively. These indicate how long and how often the machine is used for welding.

  3. The cost of electricity is measured in currency per kilowatt-hour (kWh) and varies depending on the location and provider. This indicates how much money is spent on electricity for using the machine.



Using this information, we can use the following formula to calculate the power consumption of a 3-phase welding machine:

1. Power consumption (kWh) = Power rating (kW) x Duration (hours) x Frequency (sessions per month)


For example, if we have a 3-phase welding machine with a power rating of 15 kW, and we use it for 20 minutes (0.33 hours) per session for 150 sessions per month, and the cost of electricity is 0.8 currency per kWh, then the power consumption of the 3 phase welding machine is:


2. Power consumption (kWh) = 15 kW x 0.33 hours x 150 sessions per month Power consumption (kWh) = 742.5 kWh per month


The cost of electricity for using the 3-phase welding machine is:

Cost of electricity = Power consumption (kWh) x Cost of electricity (currency per kWh) Cost of electricity = 742.5 kWh x 0.8 currency per kWh Cost of electricity = 594 currency per month

Therefore, using a 3-phase welding machine with these parameters will consume 742.5 kWh of electricity and cost 594 currency per month.

Of course, these values are only estimates and may vary depending on the actual conditions and settings of the machine and the welding process. To reduce the power consumption and cost of using a 3-phase welding machine, some tips are:

  1. Use a lower power setting if possible, as this will reduce the current draw and heat generation of the machine.

  2. Use a higher efficiency machine if possible, as this will reduce the power losses and waste heat of the machine.

  3. Use thinner metal if possible, as this will reduce the resistance and heating time of the metal.

  4. Use shorter welding sessions if possible, as this will reduce the idle time and standby power of the machine.

  5. Maintain and service the machine regularly, as this will improve its performance and reliability.

By following these tips, we can save electricity and money while using a 3-phase welding machine.


In conclusion, a 3-phase welding machine is a powerful and versatile tool for electric arc welding, but it also consumes a lot of electricity and costs money. The power consumption of a 3-phase welding machine depends on the power rating, the duration and frequency of use, the type and thickness of the metal, and the efficiency of the machine. By using the formula and the tips given in this article, we can estimate and reduce the power consumption and cost of using a 3-phase welding machine. We hope this article has helped you understand how much power is consumed by a 3-phase welding machine and how to save electricity and money while using it.



Related articles:

1. How to Convert 3 Phase Welder to Single Phase

2. How Much Power is Consumed by a 3 Phase Welding Machine?

3. Three-phase Welding Machine VS. Single-phase Inverter Welding Machine

4. Powerful Heavy Duty Inverter Welding Machines For Precision Welding

5. Inverter Welder Problems and How to Solve Them?