Wang, FudeWilliams, Stewart W.Rush, M. T.2012-02-222012-02-222011-11-30F. Wang, S. Williams, M. Rush. Morphology investigation on direct current pulsed gas tungsten arc welded additive layer manufactured Ti6Al4V alloy. International Journal of Advanced Manufacturing Technology Volume 57, Numbers 5-8, pp597-603.0268-3768http://dx.doi.org/10.1007/s00170-011-3299-1http://dspace.lib.cranfield.ac.uk/handle/1826/7025The effects of pulsed gas tungsten arc weldingparameters on the morphology of additive layer manufacturedTi6Al4V has been investigated in this study. Thepeak/ base current ratio and pulse frequency are found tohave no significant effect on the refinement of prior betagrain size. However, it is found that the wire feed ratehas a considerable effect on the prior beta grainrefinement at a given heat input. This is due to the extrawire input being able to supply many heterogeneousnucleation sites and also results in a negative temperaturegradient in the front of the liquidus which blocks thecolumnar growth and changes the columnar growth toequiaixal growth.en-UKMetal additive layer manufacturingpulse gas tungsten arc weldingTi6Al4Vmicrostructure refinementArticle