This book addresses the fundamental technologies and advancements in gas metal arc welding (GMAW) in metal joining and additive manufacturing. It delivers in-depth knowledge on various aspects of GMAW processes, including principles and mechanisms, metal transfer modes, process variations, monitoring and control, automation and flexibility of power sources, joining of similar and dissimilar materials, additive manufacturing, and metallurgical aspects. The book concludes with challenges and opportunities that would lead toward future directions in the GMAW process. Provides an overview of the additive manufacturing process and its capability to produce additively manufactured metallic componentsDescribes the power source and its connectivity with robots to produce complex structuresDiscusses fundamental principles of the gas metal arc welding processExplores experimental and theoretical aspects of the processesIncludes the most recent applications and real-time case studies along with relevant illustrationsThis book is aimed at graduate students and researchers in metallurgical engineering, additive manufacturing, and welding technology.