FEATURE ANALYSIS AND EXTRACTION OF INNER DEFECTS FOR SPOT WELD NUGGET OF ALUMINUM ALLOY

摘要

１ＩＮＴＲＯＤＵＣＴＩＯＮＳｐｏｔｗｅｌｄｉｎｇｈａｓｂｅｅｎｗｉｄｅｌｙｕｓｅｄｉｎａｌｕｍｉｎｕｍａｌｏｙｓｔｒｕｃｔｕｒｅｓｏｆｓｐａｃｅｃｒａｆｔａｎｄａｉｒｃｒａｆｔｄｕｅｔｏｉｔｓｃｈａｒａｃｔｅｒｉｓｔｉｃｓｏｆｔｅｃｈｎｏｌｏｇｙ．...