Main content:
Welding has always been an important process for fusing metals and other materials, and as technology continues to advance, welding equipment continues to evolve.
Inverter for welder as a product of the perfect combination of power electronics technology and welding technology, is standing out among many welding equipment with its significant advantages such as high efficiency and energy saving.
In this field, IGBT inverter for welders are one of the latest products, and their design and performance have made significant progress in recent decades. This article mainly introduces the principle, classification, advantages and disadvantages and applications of inverter for welder.
Definition of inverter for welder
Inverter arc welding power supply, also known as arc welding inverter, is a new type of welding power supply. This power supply generally converts the three-phase power frequency (50Hz) AC network voltage into DC through the input rectifier and filtering, and then inverts it into a medium frequency AC voltage of several kHz to tens of kHz through the alternating switching action of high-power switching electronic components.
At the same time, it is reduced to a voltage of tens of volts suitable for welding through a transformer, and then rectified again and filtered by an inductor, with the assistance of an inverter relay, to output a fairly stable DC welding current.
Working principle of inverter for welder
When the inverter for welder is working, the single-phase 220V/50Hz voltage is first rectified and filtered to become a smooth DC voltage of about 310V required by the inverter main circuit.
Then the DC voltage is sent to the inverter main circuit, and is transformed into a medium-frequency AC voltage of about 20K through the alternating inversion action of the high-power electronic component IGBT, and then stepped down to a voltage of tens of volts suitable for welding through the medium-frequency step-down transformer, and finally the DC welding output is obtained after rectification and filtering.
With the help of the control circuit and feedback loop, as well as the impedance of the welding circuit, the external characteristics and dynamic characteristics required for the welding process can be obtained. The AC conversion sequence is: industrial frequency AC to DC—intermediate frequency AC—step-down DC. Components like the inverter cable and inverter capacitor help optimize the conversion process. The voltage frequency of the welding machine changes in the "AC to DC-AC" stage, so the inverter welding is also called a variable frequency welding machine.
Function of inverter for welder
Since the operating frequency of the high power inverter is very high, the core cross-sectional area and coil turns of the main transformer are greatly reduced. Therefore, the high power inverter for welders can save metal materials to a large extent, reduce the size and weight, and greatly reduce power loss.
More importantly, the inverter for welder can adjust the output current within microseconds, so it can achieve the ideal control process required by the welding process and obtain satisfactory welding results.
Classifications of inverter for welder
Inverter DC manual arc welding machine This type of equipment is manually operated, easy to operate, highly adaptable, and easy to maintain. It is suitable for welding a variety of metals and is one of the most widely used welding equipment. It is widely used in welding and field operations in industries such as pipelines, chemicals, automobiles, shipbuilding, boilers, power construction, industrial installation, and bridge construction.
The inverter argon arc welding machine uses argon as the shielding gas and tungsten as the non-melting electrode. With the help of the arc generated between the tungsten electrode and the weldment, the parent material is heated and melted to achieve welding. This type of equipment is characterized by stable arc and easy control of input energy. It is used for welding metal materials with high quality requirements or easy oxidation. It is mainly used for welding stainless steel, hardware, furniture, etc.
The inverter semi-automatic gas shielded welding machine uses argon, carbon dioxide or mixed gas as the shielding gas to prevent oxidation of the welding pool. The wire feeder is used to automatically feed the welding wire. The continuously fed welding wire is used as the electrode. The arc between the welding wire and the weldment is used to melt the metal to achieve welding. It is easy to achieve mechanization and automation, with high production efficiency. It is widely used in carbon steel, stainless steel.
Advantages and disadvantages of inverter for welder
Advantages:
- Small size, light weight, material saving, easy to carry and move.
- High efficiency and energy saving, the efficiency can reach 80%~90%, saving more than 1/3 of electricity compared with traditional welding machines.
- Good dynamic characteristics, easy arc initiation, stable arc, beautiful weld formation, small spatter.
- Suitable for combination with robots to form an automatic welding production system.
- One machine can be used for multiple purposes to complete a variety of welding and cutting processes.
Disadvantages:The main disadvantages of inverter welding and cutting equipment are that it involves more electronic components, complex structure, and difficulty in debugging, testing, and parameter setting during product production.
Application of IGBT in inverter for welder
IGBT inverter for welder uses AC-DC-AC-transformer-DC-output conversion to power the welding process. The 50Hz AC power is rectified into DC power by a full-bridge rectifier, and then inverted into a 20-30kHz medium-frequency rectangular wave by the IGBT, the voltage is reduced by the medium-frequency transformer, rectified again, and then stabilized into a DC power supply.
The output waveform is smooth, and the output size is changed by controlling the on-time of the IGBT inverter through PWM pulse width modulation or phase shift control. In addition, the integration of a lighting inverter ensures stable power supply. Compared with traditional non-inverter welders, welding machines based on high-frequency inverters are more efficient and have more flexible control performance.
Conclusion
In summary, the inverter for welder has become an indispensable and important equipment in today's welding field with its unique inverter principle and excellent performance. It not only improves welding efficiency and quality, but also promotes the continuous development of welding technology.
It can be foreseen that the inverter for welder will continue to play its huge advantages in the continuous technological innovation and development, provide more high-quality and efficient solutions for the welding needs of various industries, and lead the welding industry to a new height.
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