THE STRUCTURAL STABILITY OF WELDS IN COLUMBIUM ALLOYS.
Quarterly progress rept. no. 3, 1 Nov 63-1 Feb 64,
GENERAL ELECTRIC CO CINCINNATI OHIO
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Aging studies of the three weld conditions were essentially completed and the aging kinetics compared. The B-66 .125 inch thick sheet was received and the evaluation of the effect of thickness initiated. Several conclusions have developed. 1 Interdendritic spacings of the weld metal are more strongly influenced by power input and cooling rate during welding than by chemical composition. 2 As-welded bend transition is dependent on welding speed. The faster the speed the lower the bend transition temperature for the condition studied. 3 The kinetics of aging in the temperature range of 1600 - 2200F is strongly influenced by interdendritic spacing, hence by weld parameters. The larger the interdendritic spacing the more sluggish the aging reaction. 4 A double aging reaction has been found in the B-66 alloy, one which occurs in the weld zone and a second which involves the heat affected zone. Author