The techniques of linear-elastic fracture mechanics were used to characterize fatigue-crack propagation behavior in three dissimilar metal weldments at test temperatures of 800°F (427°C) and 1000°F (5Z8°C). The weldments studied included Inconel 718/Type 3l6, all using Inconel 82 as the filler metal, in general, fatigue-crack growth rates in the weldments were equal to 3 or less than, those observed in the base metals. Crack deviation from the expected path perpendicular to the loading axis was noted in some cases, and is discussed.
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