Laser welding covers the fusion joining of aerospace metallic structures and components using focused high-energy laser beams — typically Nd:YAG, CO₂, or fibre laser sources — to produce narrow, deep-penetration welds with minimal heat-affected zones (HAZ) on materials including titanium alloys, aluminium, high-strength steels, and nickel superalloys, encompassing both continuous-wave and pulsed operating modes.
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