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Research on High-power Variable Polarity Plasma Arc Welding Power Supply System

Author: XieXingKui
Tutor: DuDong
School: Tsinghua University
Course: Materials Science and Engineering
Keywords: Variable polarity plasma arc welding Welding power source Inverter Controller
CLC: TG434.1
Type: Master's thesis
Year: 2005
Downloads: 253
Quote: 0
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Abstract


Variable polarity plasma arc welding (Variable Polarity Plasma Arc Welding) with heat concentrated , forming side welding and cathode cleaning , etc. , especially suitable for the connection of aluminum-magnesium alloy material , a wide range of applications in the aerospace manufacturing industry prospects. Variable polarity plasma arc welding power grid energy is converted into asymmetric alternating square wave current welding arc , arc stability and weld quality . In this paper, a new generation of high - power variable polarity plasma arc welding power system development work , arc welding power source power conversion circuit , arc welding power control system , described arc welding systems integration . Power electronics - based technology , including the main arc power and arc starting power energy conversion loop , and can adapt to the dynamic changes of the load of the welding arc . The main arc power supply with dual inverter structure before inverter frequency to 20KHz, the maximum power output current of up to 500A . Has since adjusted conversion level inverter technology to control functions , both to ensure the safety and reliability of the high current output inverter , while maintaining the small current output arc stability , and can adapt to the needs of a wide range of output current regulation . Arc welding power control system consists of a programmable welding process controller and power controller . Power controller as the core voltage PWM IC , the no-load voltage control and overcurrent , overvoltage, undervoltage , overheating protection function , using a combination of average current feedback and the feedback control of the transient current pulses dual closed loop precise control of the output current in the arc welding process control to achieve both higher control precision , fast dynamic response speed , arc welding power system stability and reliability . On the basis of the above work , build a high-power variable polarity plasma arc welding systems , mainly include arc welding power supply system, variable -bit machine system , wire feeding systems , gas flow controller and the plasma torch . Variable polarity plasma arc welding process parameters on weld quality welding of aluminum alloy and stainless steel materials experiments . The experimental results show that the development of high-power variable polarity plasma arc welding power system is reliable and able to meet the needs of the actual welding has a good prospect .

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Welding, metal cutting and metal bonding > Welding equipment > Arc welding equipment > Power supply
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