Abstract
In the present chapter, the fundamentals of laser beam welding technologies are discussed in detail. The basic principle of laser generation, behavior, and characteristics of a laser beam are elucidated. The working principles of fiber laser, their construction, and advantages over other lasers are explored. Also, various welding process parameters which affect the quality of weldments are discussed. The titanium alloys possess an outstanding combination of lightweight, moderate corrosion resistance, and high specific strength. However, it becomes highly reactive beyond 300°C temperature. Therefore, the weldability aspects of Ti-6Al-4V are also discussed. The need for the design and fabrication of a shielding gas delivery system in laser welding of Ti-6Al-4V alloy is explored. The mechanism of phase transformation in the fusion zone is discussed briefly. The dependencies of various kinds of weld bead features on process parameters, a microstructural study in fusion and heat-affected zones, mechanical properties such as hardness, tensile properties, and different types of weld bead defects are discussed. The modes of fracture failure during tensile testing of fiber laser weldments of Ti-6Al-4V material are discussed. Also, it explores the prospects of the development of laser welding set-up in the future by considering their cost, beam quality, portability, and robust design.
