アーク溶接現象に関する界面張力理論(第 2 章) : 溶接現象の液滴模型

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The most essential fact in arc welding is that the mother drop is always confined within the surface of penetration. Putting a focus on this point, the author discussed in this paper on a growing liquid drop model which is considered to reproduce essential features of arc welding phenomena. It was concluded as follows. (1) The pulling force due to the surface tension acting upon an arbitrary contact line of a liquid drop was calculated, and the nature of the pulling force, which is acting on the contact line of a liquid drop confined within a flat surface of solid and counteracting pushing force of gas jet, was discussed. And the mechanism of oscillation of a liquid drop blasted by gas jet explained. (2) A model which is constituted of a growing liquid drop, which is constantly added with liquid through a moving pipe at a constant rate, and led by an accompanying gas jet with cleathe ning action upon the flat surface of a solid covered by an unwettable film, was shown to behave in quite simillar way to arc welding. (3) Especially the self-regulating effect of welding process, by which the welded bead is kept normal in some range of welding conditions, was proved to be the result of interaction between the interfacial tension of mother drop and the pushing force of arc. The phenomenon of undercut or overlap was explained as the phenomenon deyond range of the above-mentioned effect. (4) The similarity between the action of common gas jet against a liquid drop and that of arc force against a mother drop has become clear.
社団法人溶接学会の論文
1963-01-25

アーク溶接現象に関する界面張力理論(第 2 章) : 溶接現象の液滴模型

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