Fundamental Solidification Mechanism and Microstructures in GTA Spot Welds of Aluminum Sheets

概要

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GTA spot welding was performed on thin sheets of aluminum with different chemical compositions. Movement of solid-liquid interface during weld solidification was observed with 16 mm cine camera and the actual solidification rates were measured from the films. Then, the observed results were compared with the results calculated on the theory of heat conduction and it was tried to explain the mechanism of the formation of the solidification structures by applying these results to the modern solidification theory. It was found that the growth rate of the columnar grains increased as the growth proceeded into the nugget and that the result showed qualitatively a good agreement with the result obtained using the theory of heat conduction. The solidification theory and the construction mechanism of the solidification structure obtained in the unidirectional solidification were also applicable to the case of the weld solidification, when the growth rate was much faster.
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