标题：Determining the feature values of parameters indicating the critical states of molten metal bridge in short circuit transfer
作者：Chen, Maoai ;Jiang, Yuanning ;Wu, Chuansong
作者机构：[Chen, M] MOE Key Laboratory for Liquid-Solid Structure Evolution and Materials Processing, Institute for Materials Joining, Shandong University, Jina 更多
关键词：short circuit transfer;molten metal bridge;feature value
摘要：Short circuit transfer involves bridging between the consumable electrode and the weld pool, associated with variations of electrical parameters which characterize the change of molten metal bridge state and are very important for the control of spatter. In this paper, electrical process parameters and short circuit transfer images were simultaneously recorded with a LabView-based synchronous sensing and visualizing system. The arc/bridge resistance and derivatives of welding current, arc voltage and arc resistance at various instants were calculated by means of offline analysis of the welding current, arc voltage and droplet images. Parameters and their feature values indicating the onset of short circuit and the oncoming necking-down of molten metal bridge were determined. Using the calculated feature values, bridge-state-feedback control for short circuit transfer was realized with a spatter rate less than 0.25%. © 2013 Editorial Board of CHINA WELDING.