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This lecture covers laser welding techniques, including polarisation welding, Marangoni effect, and different surface tension effects. It also discusses laser soldering, deep laser welding, and various joint geometries. Additionally, it explores laser welding of plastics, applications like bending and welding, and the types of lasers used. The lecture delves into laser drilling methods, such as single pulse drilling and multiple pulse drilling, as well as laser cutting techniques, including liquid expulsion cutting and cutting by ablation. It also examines the parameters and results of laser cutting processes, emphasizing the importance of gas assistance and optimal cutting speeds.