Effects of nitrogen addition to argon on grain refining of MIG welded aluminum alloys
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It is well known that grain refining of aluminum alloys of solid-solution type on casting is acquired by the addition of a small amount of alloying elements such as zircon, titanium, vanadium, etc.As the results of a few studies, some mechanisms of grain refining on casting have been proposed. One of the theories proposed was that the reason of refining is due to the combination of titanium with carbon in molten aluminum, and as TiC has a similar lattice structure to that of aluminum, it promotes the nucleation of solid aluminum in molten metal.If TiC promotes the nucleation of solid aluminum for the reason of its lattice structure, the refining by the addition of TiN should be more effective than that by TiC, because the lattice parameter of TiN is more approximate to that of aluminum.The authors recognized in experiments that grain size of aluminum containing titanium melted in nitrogen atmosphere was finer than that of aluminum melted with addition of carbon only.By the application of the above result to MIG welding of aluminum, the authors compared the grain size of deposit welded in pure argon atmosphere with that welded in argon including nitroge.The test specimens used were Al-Mg and Al-Zn-Mg alloys containing and not containing titanium or zirconium.When aluminum alloys containing no titanium were welded, the grain size of deposited metal was not different in the case of argon and nitrogen atmosphere from the case of argon only. On the other hand, when titanium was contained in welded alloys, the grain size of deposit was very finer when nitrogen was added to argon atmosphere. The same results were also obtained in alloys containing zirconium.Experiments were further made to determine the decrease in crack of bead by grain refining. Generally, the addition of nitrogen to argon provoked short-circuit transfer action, but about 15% of the addition did not provoke the short-circuit transfer and showed the same weldability as in the case of pure argon.
- 一般社団法人 軽金属学会の論文
一般社団法人 軽金属学会 | 論文
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