The power of the welding machine indicates how much current the device will be able to deliver, with what thickness of metal it will be possible to work in the future. Professional devices can produce from 300 A, but ordinary household give less, they are designed to work at 200-250 A. If the device is needed for a one-time repair, minor construction work, then it is best to take ordinary household.
The power of the welding machine indicates the current intensity of the device and the thickness of the metal allowed to work in the future.
In the passport, manufacturers usually indicate only the maximum power consumption, i.e. peak loads and other indicators. It is this parameter that allows you to determine whether there is enough power supply to operate the equipment. We should not forget that with a decrease in the voltage in the network, many devices are also able to work, but their performance is lower.
What kind of welding transformer to choose?
A welding transformer is an equipment that can convert the current needed to operate the device. These mechanisms are inexpensive, reliable. An apparatus is used to weld low alloy steels, for this purpose, melting electrodes are used. When choosing a device for welding, you need to carefully approach the definition of power.
The scheme of conversion of electrical energy in the welding machine.
Maximum values and a certain margin should be taken into account, since this limit is often exceeded when switched on.. For example, if the unit will be used to work with a single-phase network, it is unlikely that it will be possible to exceed the current value of 200 A, we must not forget about it. In fact, this results in the impossibility of using the apparatus for welding.
When choosing, it must be remembered that the transformer wears out. The higher the value, the higher the heat and wear. If complex and long-term work is not required, then high power values are completely unnecessary. Preference is recommended to give the equipment, which is designed for 120-130 A - this is the best middle ground.Back to table of contents
Welding power rectifier
A welding rectifier is a type of transformer that allows you to convert alternating current into a constant current required for operation. Unlike a conventional transformer, a welding rectifier provides stable combustion, its quality is higher. It is possible to cook non-ferrous metals and fine parts, with great experience is not required.
Scheme of the device of the welding machine.
Determining how much power a rectifier should consume in order to ensure correct and high-quality operation is easy. To do this, you need to know that the standard arc voltage of the device is 24 V. This indicator is multiplied by the value of the welding current, i.e., 160 A. The figure to be obtained is the power of the equipment on the arc. Power consumption from the working electrical network is determined differently. It is necessary to divide the result obtained earlier into efficiency (usually 0.65-0.7 is taken for it). This will be the indicator of the maximum operating current.
When buying a value, it is recommended to always check with the stated, as manufacturers sometimes overestimate the figures in order to sell the device. In reality, it turns out that the situation is not the best when, when performing work not even at maximum values, strong overheating is observed, the power drops sharply.Back to table of contents
Welding inverter: power selection
The selection of the inverter welding machine is carried out in accordance with a parameter such as power. The rated current is taken into account, at which the device will work smoothly without overheating, even if use is intense. Overheating will not occur even during intermittent operation, i.e. at maximum current.
Welding machine control.
For example, when using an electrode of 3 mm, the working current will be 120 A. Such conditions will allow welding parts 3-4 mm thick. Therefore, when choosing, power should be taken into account when the inverter can work with a rated current of 160-180 A, but at the same time having a margin of 30-50%. Why such values? It is not recommended to operate at maximum values, as this leads to overheating, the inverter fails. By reducing the voltage of the electrical supply network to 170-180 V, the power of the equipment drops, the welding current decreases to the minimum mark. The stock is needed in the event that the load will be given a large.
The stock is also required when long cables of 5 m are used. If the stock is not observed, the characteristics of the welding machine will decrease below the nominal operating level. Such conditions are especially important when cables from 15 m are used. When choosing an inverter, it should be borne in mind that manufacturers usually overestimate performance, in fact, the current is at a lower value. What does this lead to? If the characteristics are chosen incorrectly, the device overheats during operation and fails, which entails extra financial costs.Back to table of contents
Automatic welding how much power to buy?
Functional diagram of the power source of the inverter welding machine.
Modern semi-automatic allows you to perform even the most difficult work, for example, to produce high-quality welding of sheet iron, non-ferrous metals. The parameters of this type of device are such that it becomes indispensable for welding thin-layer metals. It is used in auto repair shops where accuracy is high. To obtain the necessary power, gas cylinders can be connected to the equipment, but this is not necessary. It is possible to use cored wire. Some models combine 2 types of equipment - welding generators and semiautomatic devices.
When choosing equipment for power worth paying attention.
We should not forget about what should be the power consumption at the time of inclusion.
It is always greater than that used during normal operation of the device. Usually the cost of mechanisms with a low power level is much less. But it is with this machine you can cook even the finest details, and this is important when performing high-precision work.Back to table of contents
Combined welding unit
Combined welding machine is a unit with the functions of a working rectifier or transformer, combined with a diesel generator. Such equipment can produce high-frequency or direct current, it is excellent for welding of various types. This unit allows you to work in the absence of electricity. For example, when building a house in a country plot, when the power grid has not yet been connected.
Wiring diagrams for welding machines.
In addition to diesel, petrol generators are used. The characteristics of this device may differ slightly depending on the manufacturer and model, but in general they remain at the same level. When choosing a unit for welding, it is necessary to take into account that they are mainly used on construction sites and for carrying out repair work in conditions where there is no permanent electrical network. Compared to professional ones, they may not be as powerful.
- The frequency is at 50 Hz.
- The device can operate at an alternating voltage of 110 V, 220 V, 230 V, 240 V (it is necessary to carefully read the instructions before purchasing).
- The rated power is 4.2 W, and the maximum power consumed during operation is 4.8 kW.
- Power equipment has a coefficient equal to 1.
- When idle, the voltage is 65 V.
- Arc voltage during welding is 25-30 V.
- The welding current of the unit is 180 A.
- The operating current range for uninterrupted operation is 50-180 A.
Power for a welding inverter is an important indicator. It may be different, depending on the type of device, its purpose. During the selection you should be familiar with the parameters of different welding units in order to get the most suitable option.