Friction stir welding is used to seal the gap between the substrate and the cover plate to form a water-cooling plate. FSW belongs to seamless connection. It has high welding strength, can achieve any complex flow channel shape, the product has strong anti-corrosion ability, strong heat exchange ability. Product Description Application IGBT module cooling（Electronics, electric power, new energy vehicles and other industries）； Semiconductor laser cooling； CPU、GPU（data center etc.）；