A Review on Process Monitoring and Control in Metal-Based Additive Manufacturing

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Additive Manufacturing of Metallic Materials: A Review (2017, background): “reviewed the process monitoring and control of metal AM systems [27].”
A Review on Recent Progress in Solid State Friction Based Metal Additive Manufacturing: Friction Stir Additive Techniques (2018, background): “problems stated above will be hugely significant in improving usage of this game changing process.(15,23)”
In-Situ Defect Detection in Laser Powder Bed Fusion by Using Thermography and Optical Tomography—Comparison to Computed Tomography (2020, background): “Tapia and Elwany [10] denot d quality and repeatability as the “Achilles Heel of AM” a d asserted that monitoring and control of AM is one of the key topics in numerous publications.”
A review on quality control in additive manufacturing (2018, background): “metal powder and wire feedstock) delivered from a material deposition head and substrate where materials are deposited (Tapia and Elwany, 2014; Vaezi et al., 2013).”
Process defects and in situ monitoring methods in metal powder bed fusion: a review (2017, neutral): “To face this issue, the development of process monitoring methodologies based on insitu sensing as well as novel feedback control strategies was indicated as a priority research area by many recent keynote studies, projects and roadmaps (Mellor et al., 2014; Olakanmi et al., 2015; Mani et al., 2015;”