Titanium and its alloys are among the most important materials with a wide range of applications. Titanium and its alloy offer a good combination of properties, such as low density, high strength-to-weight ratio, good biocompatibility, and excellent corrosion resistance. These excellent properties make Titanium and its alloys the favourite of many industries that ranges between, land, air and water applications. In this book, Chapter One provides a review of laser additive manufacturing of titanium and its alloys. Chapter Two presents some of these properties produced through research of laser metal deposition of Ti6Al4V. Chapter Three determines the effects of welding heat input on the high-temperature tensile properties, toughness, and microstructural features of titanium alloy. Chapter Four presents a commentary on the positive roles of hydrogen in titanium alloys in the aspects of microstructural refinement, hot workability, superplasticity, powder metallurgy, hydrogen storage, mechanical properties, wear resistance, welding, bonding, machining and deoxidation, with the purpose of helping readers to obtain a quick method of the special and effective hydrogen treatment technology of titanium alloys.