Short-circuiting Transient Phenomena in GMA/CO_2 Welding (I) : Through-the-Wire Sensor for Feedback Torch Height Control(Physics, Processes, Instruments & Measurements)

概要

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The GMAW process with short-circuit metal transfer was investigated with the aim of defining an appropriate parameter for torch-to-workpiece distance monitoring in real time. A high speed data acquisition system was designed for current and voltage waveform sampling. A PC based analyser was used for post process data analysis to study the arc and short circuit state of the process. Transient phenomena related to liquid bridge profile changes were studied by means of simulated homophase drop pool "touching" experiments. The time dependency of contact radius spreading and neck formation in the short-circuit stage of the welding process were analysed. It was found that torch-to-workpiece distance can be reliably detected from wire resistance during short-circuit stage of the welding process. This distance can be measured up to 100 times a second, which enables the signal to be used as a "through-the-wire" sensor for seam tracking in GMAW with short-circuiting metal transfer mode. The sensor was tested under various welding parameters and its applicability was confirmed by real time monitoring of the sensor signal.
大阪大学の論文