Manufacturing method of micro-channel aluminum alloy liquid cooling large panel with state monitoring function

The invention discloses a manufacturing method of a micro-channel aluminum alloy liquid cooling large panel with a state monitoring function, and belongs to the technical field of radar array plane manufacturing. The method comprises the steps that a cover plate with fins is machined, the cover plate and a bottom plate are made of 5-series aluminum alloy, and the cover plate with the fins and the bottom plate are welded through a low-temperature and low-deformation friction stir welding process: when a narrow shaft shoulder stirring head is adopted for welding, water or cooling liquid is filled into a micro-channel and circularly flows, so that the temperature of the fins is 100 DEG C or below; carrying out postweld heat treatment, and machining into a micro-channel aluminum alloy liquid cooling large panel; and the micro-channel aluminum alloy liquid cooling large panel with the state monitoring function is formed by welding the micro-channel aluminum alloy liquid cooling large panel and the aluminum-based p