The fluidity of molten pool is mainly dependent on the chemical constituents of the alloy system composed with all kinds of elements in the molten pool. As well known, the smaller the solidification interval is, the better the fluidity of alloy is. The fluidity of titanium alloy is commonly worse than pure titanium for the addition of alloying elements can increase its solidification interval. But the crystallization heat increases with increasing the addition of aluminium, which obviously improves the fluidity of titanium alloy. Compared with the previous investigation of welding with pure titanium sheet filler, the fluidity of molten pool is highly improved due to the high content of aluminium, which is propitious to the escape of H.
Consequently, the more dense weld structure without defects of pores and microcracks and in favor of improving the mechanical property of welded joint is gained by adding Ti-60Al alloy sheet filler.
The XRD results of the welded joint adding Ti-60Al alloy sheet filler is given in Fig.1. It can be seen that the weld microstructure is composed of Al, TiN, TiC, AlN, Al3Ti and AlTi. What is different from the previous investigation is that the content of titanium aluminide compound is more in the present work.
Fig.1 XRD pattern of joint adding Ti-60Al alloy sheet filler
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