Wire arc additive manufacturing: A productive variant of the additive manufacturing process

Wire arc additive manufacturing (WAAM) is a high-productivity variant of additive manufacturing, utilizing the welding arc for layer-by-layer molten metal deposition to create three-dimensional parts. This study examines the efficiency and quality control of WAAM processes, particularly focusing on the cold metal transfer (CMT) method to minimize heat input, which is critical for achieving precise bead profiles and reducing post-processing needs. Existing literature indicates that variations in welding current, deposition speed, and heat input significantly influence the forming characteristics of the resulting parts. This paper analyzes prior research findings on the effects of current levels on bead appearance, optimal ranges, and the comparative impact of parameters on layer dimensions. The results identify that arc behavior is key in enhancing the overall quality of WAAM products by optimizing process parameters. Through this investigation, insights on minimizing dimensional discrepancies in multi-layer, single-pass parts are presented, supporting the advancement of wire-based additive manufacturing techniques. The findings contribute to a deeper understanding of arc characteristics and their transmission of performance outputs in high-rate production environments, establishing benchmarks for further research and application in industrial settings.