For high-advanced electronic products, it is required that the cooling structure occupies as little space as possible, the lighter the better, and the more reliable the better perform. Obviously, the air-cooled fin passive radiator cannot meet this requirement. Designers gradually change from air-cooled cooling structure to water-cooled plate cooling structure. This scheme involves what kind of process to involve the water-cooled plate to achieve the design intent.
There are currently three options: First, heat pipe dissipates heat; Second, copper pipes are buried in aluminum plates to form waterways to dissipate heat; The third is the integrated cold plate, which is directly milled in the aluminum plate, and the cover plate is welded to form a channel. According to the above three water cooling plate design schemes, the analysis is as follows: Heat pipe cooling: generally, a self-cooling cycle is formed in a vacuum pipe body, but this scheme cannot be used as a large cold plate, and it is inconvenient to maintain.
Buried pipe heat dissipation: the manufacturing cost of buried pipe heat dissipation is low, and the groove is milled in the aluminum plate, and the copper pipe is buried according to the groove to form a closed channel. Glue is used to fill the gap between copper pipe and aluminum plate. This scheme can meet the heat dissipation requirements, but it has the disadvantage that a large heat dissipation area cannot be formed locally, and it cannot meet the heat dissipation requirements of some structural members. Whole cold plate: the groove is milled directly in the aluminum plate, and the cover plate is welded to form a channel, so it is necessary to choose a welding process to seal the bottom plate and the cover plate. In the early stage, the brazing process is adopted. The disadvantage of brazing is that the lost solder is easy to lose, which will block the waterway, and the location where the lost solder is lost will be unwelded, resulting in water leakage in the waterway. The yield is about 80%, which is controlled by manual proficiency, sense of responsibility, consistency of solder and temperature in furnace.
Too many uncertain factors lead to the unreliability of welding liquid-cooled panels with this technology, especially for important structural parts. Because of the unreliability of brazing technology, radar electronic radiator seeks friction stir welding technology to manufacture aluminum alloy water-cooled plate, and friction stir welding technology shows unparalleled advantages in this product:
1. Welding at normal temperature and under normal conditions, without grooving, packing, vacuumizing and gas protection;
2. The working environment is pleasant, and there is no noise, arc or radiation in the welding process;
3. High yield, numerical control operation, independent of manual proficiency;
4. High efficiency. Under the condition of constant materials and correct parameters, the finished product rate is 100%.
1. Soldering Material
There are more than 2000 kinds of brazing materials in the world. The most advanced brazing material in the world. According to the base material, heating method, working temperature and other relevant requirements, the brazing materials shall be selected. Gold-based, silver-based, copper-based, palladium-based, nickel-based and aluminum-based brazing materials can be provided. Industry: Refrigeration, air conditioning, electronics, automobile industry, aerospace, cutting tools, motor trains, hydraulic pipelines, medical and other industries.