This book presents a comprehensive and multidisciplinary perspective on advanced welding technologies offering a global view of welding advancements, spanning traditional fusion methods to emerging solid-state and additive techniques. The chapters cover key processes such as arc welding, resistance spot welding, laser welding, friction stir welding, and arc-based additive manufacturing. Special attention is given to microstructural transformations, process–property correlations, and the welding of advanced alloys and dissimilar materials. Features: Explores the welding of ferrous, nonferrous, and dual-phase materials with insights into microstructural evolution and mechanical performance. Includes case studies on pulsed laser welding for polymers and spot welding of titanium alloys. Discusses process optimization, industrial adaptability, and challenges in welding dissimilar materials. Highlights the role of arc-based additive manufacturing in bridging conventional and modern fabrication routes. This book is aimed at researchers, graduate students, and professionals in materials science, manufacturing, and mechanical engineering.