Cold pressure welding, at room temperature conditions, with the help of the metal to be welded to produce plastic deformation and solid-state welding method. Pressure deformation, the workpiece contact surface of the oxide film is destroyed and squeezed out, so that pure metal contacts to achieve intergranular bonding, to clean the welded joints. The applied pressure is generally higher than the yield strength of the material to produce 60 to 90% of the deformation. Pressing method can be slow extrusion, rolling or impact, can also be divided into several times to achieve the required amount of deformation.
The main technical parameters of welding are determined by the mold size, so it is easy to operate and automation, the welding quality is stable, the productivity is high, the cost is low; Do not use flux, the joint will not cause corrosion. ; Welding joint temperature does not rise, the material crystalline state unchanged, especially for dissimilar metals and heat welding can not be achieved in a number of metal materials and products welding. Cold welding has become the electrical industry, aluminum products and space welding the most important in the field of one of several limited welding methods.
Cold presses and the surface of the die may accumulate metal debris, must be regularly removed. If compressed air, compressed air can be used to blow off the debris. If you want to completely remove the debris, you can remove the mold from the welder, the mold of the four modules apart, with a magnifying glass carefully each module to ensure that all the surface of the module trace debris have been cleared. Mold removal must be careful, especially small springs easy to lose. The unclean surface of the mold will cause the wires to slip easily in the mold, so that the welding fails. Note that the mold after the maintenance of the work surface must not allow any grease.
