STUDIES ON CHARACTERISTICS OF FRICTION STIR WELDED JOINTS IN STRUCTURAL ALUMINUM ALLOYS PART 1: METALLURGICAL FEATURES OF FRICTION STIR WELDED ZONE

摘要

Metallurgical features of friction stir welded (FS welded) joints under the combination of 5083, 6N01 (6005C) and 7N01 (7204) alloys of 8 mm thick parent materials by two or three fabricators and four ways of the procedures and also difference in these features caused by the dissimilarities were studied. Shapes and structures of FS welded zone, and their hardness distribution, etc., were clarified and these profiles were put in order according to these combinations. Some convenient means as a measure, from practical use, to estimate these profiles were examined although further research seemed to be needed for the establishment, together with theorization of friction stir welding mechanism. The dissimilarities in both of them were clearly reflected in the hardness distributions, and the distributions to consider suitable were obtained under their specified combinations.