After more than ten years of development, soldering radiators has developed from brazing as the main process in the early stage to soft soldering as the main process of this type of radiator. Soldering is also traditionally called soldering. In terms of technology, this type of welded heat sink combines the two parts of the bottom plate and the fins of the heat sink by welding. The soldering process is widely used, as long as the surface can be treated for solderability and can withstand a certain temperature, it can be welded. The most commonly used materials for welding heat sinks are copper and aluminum. Considering the cost, structure, performance, heat transfer and cost, copper and aluminum are the most widely used.