溶接凝固機構とその組織の特性(第 9 報) : 5083 耐食アルミニウム溶接金属中の羽毛状晶の発生とその性質

概要

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Investigations have been made on some metallurgical and mechanical behaviors of the feathery crystal which is developed in TIG arc weld metal of 1 and 2mm thick 5083 aluminum alloy sheets. The major conclusions obtained are as follows : (1) The solidification structure in the center of the weld metal varies generally from columnar to feathery and an equiaxed crystal as heat input is increased under the same welding speed of less than 500mm/min. Moreover, the feathery crystal is developed more esaily at low welding speed. (2) The growth mode of the feathery crystal in the weld center is macroscopically in the shape of an unfolded fan with a large curvature. This is due to the phenomenon that each twin plane in the feathery crystal, microscopically, grows intermittently with a small inclination angle with each other. (3) According to X-ray analysis the twin plane the feathery crystal developed in the weld metal accords with {111} and the difference in the orientation of adjacent twins is within a few degrees. (4) When the feathery crystal is developed in the weld metal the elongation of the welded joint decreases considerably, while the tensile strength does not decrease much.
社団法人溶接学会の論文
1972-10-25