Common processes: ded (direct metal deposition), waam (arc additive manufacturing), LMD (laser material deposition)
Description: this method extrudes metal, whether metal powder or wire, and then is immediately impacted by high energy (melting can be achieved by plasma arc, laser or electron beam). Melt the metal through the mechanical arm to the 3D position immediately. It is very similar to welding, so one of the main applications is to repair existing metal parts and increase the functionality of parts.
Technical advantages: metal wire is the most affordable form of metal 3D printing material. Some machines can even use two different metal powders to make alloys and material gradients. 5-axis and 6-axis movements can produce models without using support materials. Damaged metal parts can be repaired and new components can be added. Large construction volume, efficient use of materials, high part density, good mechanical properties and fast printing speed.
Technical disadvantages: the surface quality of parts is poor, which usually requires machining and finishing, and small details are difficult or impossible to achieve. High mechanical and operational costs.