Abstract
A perspective will be given that outlines important considerations in evaluating and predicting weldability. An examination will be made of the local conditions necessary for solidification crack initiation and growth in a weld. This will be done in light of two prominent thermo-mechanical approaches involving critical strain and critical strain rate. Critical conditions will be identified based upon values available in the literature. Methods used to measure strain and strain rate will be compared. The interpretation of crack length measurements commonly used to quantify weldability will be questioned, based upon our current understanding of the problem. Complications and problem areas needing better definition will be identified and discussed, including strain distribution in the mushy zone, segregation at grain boundaries, effect of impurities, and effect of cooling rate on solidification path. Finally, a suggestion will be made for a new approach to weld development using in-situ strain rate measurement and new composition-strain rate maps that define the boundary between crack and no-crack conditions.
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Cross, C., Coniglio, N. (2008). Weld Solidification Cracking: Critical Conditions for Crack Initiation and Growth. In: Böllinghaus, T., Herold, H., Cross, C.E., Lippold, J.C. (eds) Hot Cracking Phenomena in Welds II. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-78628-3_3
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DOI: https://doi.org/10.1007/978-3-540-78628-3_3
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