Rotating preheating friction micro-welding method

The invention provides a rotating preheating friction micro-welding method and relates to a welding method. The objective of the invention is to solve the problems that when the technologies of soft soldering, hot pressure welding and the like are adopted for connection in the existing micro-connecting field, connecting temperature is higher than a solder melting point and causes large influence on the thermal impact of a micro-interconnection structure. The method comprises the following steps: firstly, adopting a small-diameter capillary to clamp a drill bit and form a locating hole in a soldier at preset depth; then, adopting the small-diameter capillary to clamp a to-be-welded component, enabling the capillary to drive the to-be-welded component to go into the locating hole at a rotating speed V1 and an axial feeding speed V0, stopping axial feeding when the component reaches depth L1, raising the rotating speed and keeping the rotating speed for S seconds; then, lowering the rotating speed to the origina