被覆アーク溶接棒の溶滴移行性について(第3報) : 溶滴移行の機構

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In order to obtain the melting surface of slagcovered welding electrode, strong impact was horizontally exerted upon the welding rod in the course of welding. The molten droplet hanging at the tip of electrode was thrown away, and the resulting convex or concave melting surface during welding was observed and measured. In addition to this, specific melting rate (S.M.R.), and mean diameter of droplet (d50), as defined in the previous paper, were measured with five types of electrode at various welding currents and polarities. The results obtained were as follows. (1) The melting surface of each electrode changes from convex to concave as welding current increases, and the more concave it becomes, the higher is the specific melting rate of the electrode, excluding D4316 type electrode. The changes in melting surface with current are remarkable in case of D4316, being the highest in S.M.R., and in case of D4313 being, the lowest. (2) The specific melting rate is not affected by the changes in welding current, mean diameter of droplet, or electrode tip pattern. (3) Difference in specific melting rate, d 50 or electrode tip pattern, with the polarity of welding current, is rather small compared with that which occurs with the flux type of electrode, and there is no definite rule on the effect. (4) Small indentations always were observed on the melting surface except in the case of very small current, which might prove direct action of the arc accompanying the indirect action on the bare surface of melting during welding (5) A new mechanism for detachment of droplet from the tip of welding electrode is proposed, which is based on the rotation of the dorplet around the melting surface of electorode, motivated by the interaction between surface tension of droplet and repulsive force of the arc.
社団法人溶接学会の論文
1964-01-25

被覆アーク溶接棒の溶滴移行性について(第3報) : 溶滴移行の機構

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