New approaches to modern manufacture have emerged from Additive Layer Manufacturing
(ALM) technologies over the last 25 years. These approaches provide form, fit and function to a wide range of metallic alloys and components. Wire + Arc Additive Layer Manufacture
(WAALM) has gained the interest of the research community in recent years due to its high
deposition rate and efficiency (100%). The technique has been presented to the aerospace
manufacturing industry as a unique low cost solution for large structural components
manufacture. With this process product development time, capital investment and “Buy-to-
Fly” ratios can be significantly improved. One of the greatest challenges of WAALM systems
is the control algorithms needed to predict optimum welding parameters in order to achieve a
specific target wall width/height requirement, and maximum deposition efficiency. This paper
describes a process model for multilayer Ti-6Al-4V deposition using the Gas Metal Arc
Welding based process of Cold Metal Transfer. The process model is based on a Systematic
Experimental Approach carried out using a regression analysis. The mathematical
relationships obtained are ready to use in future large scale “intelligent” WAALM controllers.