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CO 2 gas shielded welding because of its energy-efficient , low cost and more widely , but its spatter , weld problem has not been solved , thus limiting further promotion and application. Secondly , inverter welding power source due to energy saving , small size , light weight, etc. , has become one of the leading products of the welding power source . Compared with developed countries , China's current development and production of application in inverter welder there is a gap. This article focused on the above issues , engaged in research work in the following areas : selection of IGBT module as a power transfer switch , full-bridge inverter main circuit , designed and developed a high-performance microprocessor system hardware and software microcontroller 80C196KB a large number of the process experiments show , the power supply has a fast dynamic response , reliable operation , strong anti-jamming features . Self-developed high-speed data acquisition system for CO 2 short circuit transfer welding process dynamic information parameters, voltage, current, signal analysis , research , and determined to distinguish short-circuit short-circuit the process of arc voltage start and end time , the second derivative of the arc voltage source to determine the start time of the liquid bridge necking . Argument splash of the current waveform control solution , forming a viable program . Identified the main circuit inductance waveform control , the current waveform control system hardware and software have been designed and developed continuous filtering role and welding process to ensure that the output circuit inductance current , at the same time meet the needs of the current waveform rapid control analysis and testing to determine the best output circuit inductance range . The waveform control program enacted through experimental studies to determine the current waveform control method using PWM direct current feedback regulation given the integrated control program to reduce spatter improve weld shape .
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