SIC Switch Welder

What are features of SIC Switch Welder?

Main technical advantages of SIC welding machine

1.Simple line and convenient installation

During installation of the equipment, it is only necessary to connect the three-phase power supply with the main circuit cables of the SIC High-efficiency switch welder. There are less than ten connecting line between the three-phase power and the SIC High-efficiency switch welder. There are also a small number of connecting line between the SIC High-efficiency switch welder and the operation desk. In the event that the user provide good cooperation on the site, the installation of the entire power supply can be completed within two days.

2 .Complete protection and easy maintenance

1) Main control board: over-current protection, open circuit protection, temperature protection, water shortage protection, water temperature protection, over voltage protection, low power supply voltage protection, power supply indication, main circuit connection indication, and safety start/stop control circuit.

2) Inverter trigger board: high phase protection, low phase protection, frequency over-limit protection, over-voltage protection, low power supply voltage protection of control board .

3) Power module board: high water temperature protection, low power supply voltage protection, pulse loss protection, power module (SIC) damage protection.

With the power module board as the bottom layer, the alarm information in the above three parts of protection is transmitted to the inverter control board through a fast optical coupler, and then sent to the main control board after corresponding processing by the central control board. Any fault occurs in the module.

3.Small harmonic interference and no pollution to the power grid

Three-phase AC power supply coverts the alternating current to the direct current through the full-bridge rectifier circuit. The line is equipped with a number of well-matched filter networks, leading to a very few harmonic components during operation of the SIC High-efficiency switch welder. The power factor may reach 0.96 or more.

4 .Safety without high pressure and no sparking by sensor to steel pipe

The new generation of SIC High efficiency switch welder uses low-voltage high-current resonant technology to enable the sensor to obtain the appropriate output voltage, which avoid the sparking between the sensor and the pipe, and increase the stability of the equipment.

5.High efficiency and remarkable energy conservation

Loss of power device is divided into conduction loss and switching loss. Power IGBT and SIC devices have very low conduction loss. However, since parasitic inter-electrode capacitance exists among the pins of the power electronic devices, the charge on the capacitor will be converted into thermal energy for dissipation during device switching. This undoubtedly increases the device heating, and reduces the machine efficiency and power stability. As the operating frequency increases, the switching loss of device will reach the unacceptable level. It is the main reason for limiting the operating frequency of power electronic device. Therefore, people have developed the soft-switching technology. At present, the main soft-switching technology is zero-voltage switching technology (ZVS) and zero-current switching technology (ZCS). The switching loss of the power device can be very considerable under high-frequency switching situation . Because ZVS technology is to realize the switching when the drain-source voltage of the SIC tube is zero, the stored charge of the inter-electrode capacitor has already been discharged with the resonant circuit, so the switching loss can be reduced to zero. However, the ZCS technology can not decrease the switching loss to zero. The power supply uses advanced zero-voltage switching (ZVS) technology, which almost completely eliminates the switching loss of power devices under the high frequency. When the sensor and the unit are adjust the optimal status, the machine efficiency can reach up to 90%.

6.Small welding spatter and good welding quality

Thanks to the replacement of thyristor with IGBT and fast recovery diode, the new generation of SIC High-efficiency switch welder enjoys stable output, the weld presents a bright line during welding, without a lot of sparks. So, the quality of the corresponding weld is considerably increased. The internal weld is basically a straight line, which is the main reason for high-precision welded pipe to widely use the SIC High-efficiency switch welder.

7.Load matching technology (optional)

For the same SIC High-efficiency switch welder, as the unit changes steel pipe specifications and uses different sensors, the adjustment of unit status or change of welding method will cause change in the equivalent impedance of load, resulting in load matching problem. The purpose of load matching is to equalize the equivalent impedance of the load with the required impedance (RN=UN/IN) of the welder so as to ensure that the welder can output its nominal rated power under different load conditions. Good load matching is the guarantee for welder power output, reliable operation and high-efficiency operation. The consequence of load mismatch, regardless of light load or heavy load, is that the welder can not output the nominal rated power, resulting in great waste of energy. Traditional load matching methods: after shutdown, manually change the resonant tank capacitance and the sensor parameters, etc. For the new generation of switch welder, the tank circuit inductance parameters may be changed without shutdown to achieve load matching, which can greatly improve the operation efficiency of the welder.

The main purpose of SIC switch welder process