溶着金属の基礎的研究(第 1 報)

概要

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When the weld molten metal solidifies, it forms a conspicuous cellular structure. Up to this time, the primary structure has been observed macroscopically. Then anthors investigate it microscopically using a special etching reagent that is a saturated solution of picric acid added with a surface active agent. On the other hand a temperature cooling curve is plotted of the weld deposit metal using the Fe-W thermocouple, and the relation studied between the cooling velocity and the primary structure. The results are summarized as follows; (1) The weld molten metal does not cool smoothly, because it is disturbed by the arc. (2) The cellular structure in the weld deposit metal grows in the direction of heat flow. But under, microscopy, each cell grows straight. (3) In proportion as the cellular structure grows, it also grows fat in radial direction and forms a counter cone. (4) It is not the cooling velocity but the mass of the weld deposit metal that controls the grain size of the primary structure. (5) In proportion as the cellular structure grows, it is transformed into a cellular dendrite, and a free dendrite is formed at last.
社団法人溶接学会の論文
1967-11-25