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Fundamental Studies on the Mechanism of Ultrasonic Welding

W. J. LewisJ. N. AntonevichR. E. MonroeP. J. Rieppel

出版	Wright Air Development Division, Air Research and Development Command, U.S. Air Force, 1960
URL	http://books.google.com.hk/books?id=hGf2GgAACAAJ&hl=&source=gbs_api

註釋The fundamental mechanisms of ultrasonic welding and the application of this process to the joining of various heat-resistant materials were investigated. Previous studies which had shown the effects of time, temperature, and clamping force on ultrasonic welds were expanded to include studies of the shear force during welding. Ultrasonic spot welds made in various combinations of heat-resistant alloys generally confirmed the results of previous work with these alloys. Cracks were found at the edges of the spot welds in most of the material combinations studied. The effects of these cracks on weldment properties varied with the material. The presence of a reaction zone, apparently consisting of intermetallic compounds, was apparent in ultrasonic welds made between Ti and stainless steel. These findings indicate that ultrasonic welding is not suitable for the production of aircraft-quality spot welds in heat- resistant and dissimilar metal combinations. It is apparent as a material's hardness increases, and the ratio of tensile strength to yield strength decreases, that weldability by the ultrasonic process decreases.