Brazing is a method of metal thermal connection. Brazing aluminum plates and rod cores are used to raise the temperature to the melting temperature of the solder in a vacuum-protected atmosphere, using solidification of the liquid phase solder and diffusion between the base metal. The connection between metals, the remarkable feature of brazing is that the brazing temperature is less than the influence of the parent metal, and there is no heat affected zone.
Brazed aluminum sheets and rod cores have the distinct advantage over conventional products in that a solder joint is formed at each contact point between the sheets. Brazing process: The surface-cleaned workpieces are assembled together in a lap type, with the brazing material placed near the joint gap or between the joint gaps. When the workpiece and the brazing material are heated to a temperature slightly higher than the melting point of the brazing filler metal, the brazing material melts and is sucked into and filled with the gap between the solid workpieces by capillary action, and the liquid brazing material and the workpiece metal mutually diffuse and dissolve, and after the condensation, the brazing is formed. Welding head.
The main advantages of brazing aluminum plate and rod core are low heating temperature, small change of base metal structure performance, small stress and deformation of weldment, smooth and smooth joints, and multiple pieces and multiple joints at one time, so the productivity is high; Non-ferrous metals can also weld dissimilar metals, metals and non-metals. In short, brazing is more suitable for joining precision, miniature, complex, multi-weld and dissimilar materials.