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Hot cracking phenomena in welds II by Thomas Böllinghaus; et al

By Thomas Böllinghaus; et al

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Rappaz: A Granular Model of Mushy ZonesFormation of a Coherent Solid and Localization of Feeding, Acta Materialia 54 (2006) 4023-4034. Application of RDG Hot Tearing Criterion to Welding of Al Alloys 37 10. -M. Drezet and M. Rappaz: In the proceedings of the First EsaForm Conference on Material Forming, Ecole des Mines de Paris, CEMEF, Sophia Antipolis, France, (Mar. 1998) pp. 49–52. 11. M. -M. Drezet, V. Mathier, and S. Vernède: In Materials Science Forum vols. 519–521 (July 2006) pp. 1665–1674, Trans Tech Publications, Switzerland.

G. SCTR) in any straight forward manner. E. Cross, N. Coniglio purposes of crack length and SCTR comparisons. Varestraint tests run at sub-normal speeds will likely result in MCD values that are even more unrepresentative of a characteristic temperature range. One additional problem with varestraint testing is worth pointing out here, as it helps to explain the discrepancies observed in MISO measurements given in Table 3. When using the TVT test, it has been found that the strain experienced in the mushy zone can far exceed the applied strain.

Now that mechanisms are being developed to explain how a liquid fails, a mechanism is now available to help guide how we look at weld cracking. Strain rate, before just a secondary effect needed to achieve a critical strain, has now become a key controlling factor for both crack initiation and growth. Common weldability tests involving the application of a fixed strain at high rates, far exceeding critical strain rate values, are likewise coming under scrutiny as to just what it is they represent.

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