Abstract
In order to clarify the mechanism of change in molten pool geometry by plasma arc heating, the effects of oxygen contents of Fe-O melts on the geometry and flow behavior of molten pool were investigated. Also, the temperature coefficients of surface tension of Fe-O melts were examined in a temperature range from 1823 to 2023 K. The depth of molten pool increased and the width of it decreased with increasing oxygen contents. Outward flow was observed at the surface of molten pool in the case of a low oxygen level and inward flow was observed in the case of a high oxygen level
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