Laser as a welding tool was first used in the 60's; then it was ruby crystal lasers. Active industrial application of this technology started in the 80s: the power of laboratory CO2 lasers reached 25 kW, also Nd-YAG solid-state and disk lasers were used for welding. Today, the most advanced technology for working with metals is the ytterbium-based fibre optic laser.&nb...