Publisher Summary Laser beam micro-joining provides the greatest flexibility in weld geometry with a minimum welding time as well as new possibilities in using application adapted materials. In the field of micro-production a variety of materials with individual product-specific dimensions are commonly used. Especially, the manufacturing of hybrid micro-systems, built up from different functional groups, affords variable joining technologies tailored to the specific demands of each component or material combination. Laser beam joining offers the advantage of well controlled energy input into the parts with low effects on the surrounding material. When welding micro-parts, two different kinds of laser sources can be chosen: diode pumped systems such as fiber or thin disc lasers for longer weld seams and flashlamp pumped rod lasers used for the SHADOW® welding technology. The flashlamp pumped rod laser used for the SHADOW® technique is more economic for weld seams length of up to several half centimeters.