The VDR Cracking Test for Solidification Crack Susceptibility on Weld Metals and Its Application to Aluminum Alloys(Materials, Metallurgy, Weldability)

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A new type solidification cracking test of weld metal has been developed, which was named "continuously variable deformation rate (VDR)" cracking test and then the principle of this cracking test was experimentally comfirmed and the characteristics of this testing method was also examined in details with some weld metals for commercially aluminum alloys. Moreover, solidification crack susceptibility of filler wires for MIG arc weld metals of Al-Zn-Mg alloy was examined with VDR cracking test and results were compared with those of conventional T-joint cracking test, Main conclusions obtained were as follows ; (1) It has been made clear that the VDR cracking test was very useful to evaluate the susceptibility of the initiation and/or propagation of the solidification cracking in the weld metal in actual welding process, because in this cracking test it was possible that the critical deformation rate which was considered to represent simply the properties of the brittleness temperature range was easily obtained by continuously decreasing the deformation rate applied on the solidifying weld metal during welding. (2) The susceptibility of the solidification cracking of commercial filler wires for the MIG arc weld metal of Al-Zn-Mg alloy has been evaluated with the index of the critical deformation rate obtained by the VDR cracking test and which decreased in order of 1070, (5183, 5356 and 7N11) and 4043. These results almost agreed with those in T-joint cracking test.
大阪大学の論文

The VDR Cracking Test for Solidification Crack Susceptibility on Weld Metals and Its Application to Aluminum Alloys(Materials, Metallurgy, Weldability)

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