The Research Of MIG Welding Control System With XC164CS SCM

It is important to further improve PMIG/PMAG welding control performance and corresponding process performance by full digital control design in welding machine research. The full digital controlled PMIG welding inverter (based on MCU) is studied and a new sheet metal aluminum welding process-Double PMIG is tried in this paper.Arc-length control is the core of welding process stability. A new arc-length synchronization pulse control method is presented and the higher arc-length adjustment performance is achieved within a wide range. For sheet metal aluminum welding, timely adjustment and effective control of arc-length is very important in order to avoid melt back events in the GMAW mass production in an automated production line. This paper found an interesting solution to the problem, enabling both self correction and control of the pulse parameters to be used together. This involves a characteristic which constant current during both the pulse and the background current period between pulses. The arc voltage is measured at the end of the current pulse, thus providing a signal to indicate the arc length. If the arc is too short, the pulse frequency is increased, which is done in practice by maintaining the pulse width but reducing the background current duration. The control performance and corresponding process results improved greatly.The welding current and arc voltage are the important factors of welding quality controlling, the number of welding current is determined by the speed of wire-feed, so the stabilization of wire-feed speed is very important for welding quality. In recent years, the development of digital welding machine is very fast, beside the digital controlling of welding current of the welding machine, it also acquires the wire-feed machine to be digital in order to obtain the digital control system and the better result. With the depth development of the digital pulse MIG welding, the impact of welding technology by the wire-feed speed has been paid more and more attentions. The wire-feed speed control system based on negative feedback of speed is designed. The test proves that the performance of this system has been noticeably improved than the common systems. The system can be output steadily under the factors of wire-feed resistance changing or certain different performance of motors, and this system is the base for the further improving of the quality of the pulse MIG welding. The experimental results validated that the desirable control performance is achieved with the repeatable pulse current waveform, high-speed and stable arc-voltage adjustment. Even if arc length varies with higher frequency and large amplitude in the welding process is very stable. Spatter can be avoided with new arc length control design and suitable process parameters. In addition, arc ignition program is designed and the stable arc ignition process is achieved.