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Differences between transformer, rectifier, and inverter welding machines:
Transformer, rectifier, and inverter welding machines are three different generations of electronic converters for welding machines. Transformer welding machines are completely obsolete because, with the advancement of technology, welders have been introduced to the market that provide better and more services to the customer, which is why today no one wants to buy transformer welding machines. The next generation of welding machines is rectifier. In general, for different welding applications, the welding machine requires AC or DC output current. In rectifier machines, AC (alternating current) current with high voltage is usually converted to DC (direct current) current with low voltage by this converter, while in inverter welding machines, as the newest generation of inverter module welding machines, first Converts AC current to DC current, then inverts high-frequency DC current to AC current. It should be noted that the process of converting DC to AC current is much more complicated than converting AC to DC current.
So we realized that when we come across the AC / DC option in the specifications of the welding machine, it means that the welder is an inverter machine that has the ability to weld with the output current of both AC and DC. These machines are capable of welding aluminum and are naturally more expensive than conventional welding machines.
Now let's take a look at the advantages and disadvantages of each of these machines:
The main difference between rectifiers and inverters is their weight. Rectifier machines are very heavy (200 to 300 kg) while inverter machines are light and easily portable. Also, rectifiers are only available in three-phase and you need industrial electricity to use them, so it can be said that rectifiers are industrial devices and are used in large projects such as building skeleton welding and industrial welding. On the other hand, the Single-phase inverter machines are quite a good option for welds needed for home use. Other advantages of inverter welding machine include lower energy consumption and a more stable arc. It should be noted that inverter machines are usually more expensive than rectifiers.
Differences between IGBT and MOSFET inverter welding machines:
- In terms of cost: MOSFET machines are slightly more expensive than IGBT machines.
- In terms of machine quality: the quality of both machines is similar and desirable. The difference between these machines is that the IGBT frequency is less than 30 kHz while the MOSFET frequency is about 100 kHz. MOSFET technology is mostly used on TIG welding machines.
In general, MOSFET is mainly used in MMA & TIG machines for domestic and non-industrial uses. MOSFET technology is commonly used on TIG welding machines with amps below 200 and IGBT technology is used on high amp machines, especially on most MiG machines. Finally, MOSFET is a mature technology and IGBT is the latest generation of technology in this field. Most manufacturers use both technologies for different product lines.
What is the difference between lift tig and high-frequency tig?
lift tig: This is a relatively clean process even though the tungsten torch of the tig is in contact with the metal. lift start involves rapidly lowering tungsten and contacting the metal and then rapidly raising it to make the arc for welding. Due to the desire to combine aluminum and tungsten, lift tig is not a good option for aluminum.
high-frequency tig (HF): The most popular and best option is to use a high-frequency start, which creates a high-frequency arc that can ionize the air and fill the gap between tungsten and the workpiece. As a result, when a high-frequency arc is formed, there is no need to connect the torch to the workpiece, which is a great advantage of this technology.