Since 3D printing was introduced there have been continuous developments to the process. One of these, the use of fusion welding as a deposition source, has opened up wide ranging possibilities in manufacturing. The process is one in which metal is deposited layer-by-layer to form a three dimensional shape (Figure 1). Various melting techniques have been used to achieve this aim, including electron beams and lasers. A new melting technique now being actively pursued is Wire and Arc Additive Manufacture (WAAM) using a GTAW (TIG) power source.
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