Solidification Crack Susceptibility of Aluminum Alloy Weld Metals (Report II) : Effect of Straining Rate on Cracking Threshold in Weld Metal during Solidification

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The new Trans-Varestraint cracking test of Slow-Bending type has been developed in this study. The augmented-strain can be applied on the weld metal during welding with various straining rates in this cracking test. The effect of the straining rate on the cracking threshold of the minimum augmented-strain required to cause cracking in the brittleness temperature range, BTR, during welding was investigated for Al-Mg and Al-Cu binary alloys and various commercially used aluminum alloys by means of Slow-Bending type Trans-Varestraint test (The SB Trans-Vearstraint test). Moreover, some metallurgical characteristics of weld metal, that is, the amount of eutectic products, the dihedral angle of eutectic products in grain boudaries and the grain size, were investigated. Then, the effect of these metallurgical characteristics on the ductility in the weld metal in the BTR was discussed. The main conclusions obtained are as follows: 1. The minimum augmented-strain required to cause cracking was raised at the lower temperature zone in the BTR as a decrease of straining rate. This phenomenon was observed in the weld metals of the alloys, the Mg content of which was more than about 3 wt% for Al-Mg alloys and The Cu content of which was more than about 5 wt% for Al-Cu alloys. 2. The larger the dihedral angle of eutectic products on the grain boundary, the more the amount of eutectic products of weld metal and/or the smaller the grain size of weld metal, the larger the minimum augmented-strain required to cause cracking at the lower temperature zone in the BTR was.
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Solidification Crack Susceptibility of Aluminum Alloy Weld Metals (Report II) : Effect of Straining Rate on Cracking Threshold in Weld Metal during Solidification

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