Effect of Additional Element on Weld Solidification Crack Susceptibility of Al-Zn-Mg Alloy (Report I) : Results of Ring Casting Cracking Test(Materials, Metallurgy & Weldability)

概要

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In order to select the favorable additional element to prevent the cracking occurred in GMA weld metal of 7N01 Al-4.5%Zn-1.2%Mg high strength aluminum alloy with 5356 Al-5%Mg filler wire, solidification crack susceptibility of synthesized-weld-metal Al-2%Zn-2 to 3%Mg alloy with and without 13 kinds of additional elements has been examined by means of the ring casting cracking test. Among the additional elements of Ti+B, Ti, Zr, Fe, Mn, B, Si, Be, Ni, Cr, V, Misch metal and Cu with the added amount up to about 0.5%, Ti+B, Ti and Zr proved to be the most favorable element to reduce the cracking in casted metal and their effective amounts were decided to be 0.05, 0.14 and 0.24% respectively in this experiment. Moreover a close correlation between crack susceptibility and grain size in casted metal has been confirmed.
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