Evaluation of Ductility Characteristics and Cracking Susceptibility of Al Alloys during Welding

NAKATA, MATSUDA Fukuhisa

The ductility characteristics of solidifying weld metal between liquidus and solidus temperatures during welding has been measured by artificial-restraint cracking tests, namely the Trans-Varestraint test and the Slow Bending type Trans-Varestraint test. Minimum augmented strain to cause cracking, εmin, brittleness temperature range (BTR) and critical strain rate for temperature drop (CST) were selected as criteria representing ductility characteristics and to evaluate weld solidification crack susceptibility. In addition, solidification crack susceptibilities of 16 kinds of commercial Al alloys have been evaluated qualitatively by self-restraint type cracking tests. Correlation between test results, criteria representing ductility characteristics and metallurgical factors were discussed. CST is the most suitable criterion to evaluate the weld solidification crack susceptibility of Al alloys, because crack susceptibility decreases monotonically with increasing CST. εmin and BTR are also important criteria to show the threshold at which crack susceptibility begins to increase steeply. Among the metallurgical factors, dihedral angle of eutectic products in the grain boundary and grain size showed close correlations with crack susceptibility.

Evaluation of Ductility Characteristics and Cracking Susceptibility of Al Alloys during Welding

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