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Characterisation of an Elongated Gas Pore in a Weld in Terms of Solidification Mechanics / Charakterisierung und Mechanismus der Bildung von länglichen Gasporen bei der Erstarrung von Schweißnähten

The present study was directed towards correlating the internal appearance of elongated gas pores with the growth mode and the resulting micro-segregation to the cellular-dendritic solidification boundaries perpendicular to the solid/liquid interface. In addition the shape of the elongated gas pores was related to banding due to macrosegregation parallel to the solid/liquid interface. This was accomplished using both light and scanning electron microscopy