Laser micro-welding is specially designed for welding small components through the use of laser light, which is used to rapidly melt and fuse the target metals together. Laser micro-welding uses light energy to heat only the desired weld area. 

Current flow, electrical connections or current polarity effects on the work piece are non-existent with this laser system process, eliminating any damage to electrically-sensitive components. The laser micro-welding process generates very little heat in the work piece because of the rapid melting and re-solidification of the target material. This process aids in reducing part distortion that is associated with other welding processes such as arc welding.
Laser Welding is widely used in the medical industry as well, some applications require adding of filler material but many situations specify a low-heat, hermetic weld to join instruments together to prevent debris from becoming trapped in impossible to clean areas.