Abstract: The design of a new secondary arc converter, and introduced its technical principles, performance parameters, forms of work, application methods and experimental conditions. After T / P91, T / P92, Su power stability, resistance to grid disturbances were applied along with high-strength heat-resistant steel and reinforced. Center technology welding equipment welding power source, its straight small size, light weight, high welding efficiency, excellent welding performance, has become mainstream and direction to carry out the welding power source [1-2]. However, inverter welding power save per304H other welding materials experiments indicate, the new secondary converter arc welding current stability, good welding shape, excellent quality of welded joints. Completed a green, solid, excellent welding performance converter.
Keywords: welding; welding power source; arc secondary converter; electricity build
With our ultra (ultra) supercritical units to rapidly deploy, T / P91, T / P92, Super304H, HR3C other new heat-resistant steel widely used, power plant equipment manufacturing, installation, operation, maintenance, and many other aspects of the welding process, welding materials, request welding equipment made a new request. Output current for welding equipment quality and output of the circuit complexity of the grid there is a certain harmonic pollution and other defects, robustness needs further improvement. The new arc secondary converter is to carry out, with the advantages of inverter welding power comes on bedrock absorb inverter welding power advantages, but also has a simple circuit, high reliable, pollution-free power grid inverter welding do not have the advantage of power supply.
2 technical principles and performance parameters
2.1 Technical Principle
. Meanwhile the traditional welding in order to enhance impact resistance, and makes welding equipment complex derating use. Secondary converter is a new type of welding power, the idea is that after a wide range of DC-DC converter, completed a wide range of input power output stable welding parameters. Many processes to meet the request. Secondary arc converter simplifies the original function of the welding power supply, the standard of the quality of the welding current or voltage output, so that the original welding power only assume a stable load. Principle secondary arc converter shown in Figure 2-1.
Arc welding inverter main circuit secondary forms of work: When the drive pulse is high, IGBT turn-on, current flows through the circuit for input + → SCR SCR → IGBT → L → arc reactor load → Input -; when driving pulse is low, IGBT is turned off, current flows through the circuit of the reactor L → → diode D → arc load reactor L.
Arc secondary converter control circuit voltage entire outer conditioner, current inner conditioner, PWM waveform composed of episodes, the outer ring is the voltage loop to ensure the welding voltage stability, including reactors and other electronic circuitry to dynamically adjust the separation ring current loop for constant forms of work; inner current loop is, by multi-controller and current external characteristics of current continuous, dynamic response through physically adjust the speed and stability of the power. Furthermore, the control circuit is also designed an electronic ignition device, electronic arc reactor, maximum output current limiting, overload, overcurrent, undervoltage, VRD safe installation and other maintenance circuit protection. Electronic ignition guarantees under the MMA and MIG / MAG arc welding conditions robust flexible, various maintenance circuitry ensures reliable power supply under abnormal conditions of operation or maintenance, to ensure safe and reliable operation of the device.