ABSTRACT
Nowadays, wire arc additive manufacturing (WAAM) has been the most attractive field for its expanding application areas. Moreover, WAAM has some benefits, such as being a cost-effective and less time-consuming process than other conventional (such as tungsten inert gas (TIG), electron beam machining (EBM), and laser beam machining (LBM)) deposition processes. Basically, in the WAAM technique, electric current is used as a heat source for melting the wire for layer-by-layer deposition of various materials to create a three-dimensional metal part, which is very cost-effective and reduces fabrication costs. On the other hand, weld bead geometry is one of the main concerns of the WAAM technique for optimum deposition and achieving near-net shape. On the contrary, weld bead geometry regulates the slicing height of the layer, which depends on various parameters of the weld and is determined by empirical and experimental data through trial-and-error methods. The present study reviewed the WAAM technique with different alloys, and the technique is based on wire feed speed, substrate temperature, speed of travel, and some dependent input parameters such as layer height (h), track width (w), penetration (p), accumulated area (a2), aspect ratio (b), and dilution ratio (d). Finally, the study also mentioned the future scope of this area.
