Triple multi-metal cold welding repair cold welding repair defects [casting] can occur on metal parts wear, scratches, porosity, trachoma, cracks, defects deformation, hardness and decreased defects deposition, sealing, make equal repair. Can also be formed in the metal surface wear layer, corrosion layer, heat-resistant layer, anti-oxidation layer, impact-resistant layer, strengthening the role of non-slip layer, high adhesion layer, solder layer, a conductive layer. Especially for aluminum casting porosity, trachoma repair. In the welding does not produce thermal deformation, no cracks, no hardening, repair at room temperature does not affect the machining performance, turning, milling, planing, grinding, polishing and electroplating and other post-processing. Metal cold welding repair defects applies to: mold, casting, casting, mechanical parts, auto parts, large shaft, printing equipment, water power, and other metal surface defect repair applications. Triple cold welding works: multi-metal cold welding repair of principle, the use of the charging capacitor to 10 ^ -3 to 10 -1 second cycle, 10 ^ -6 to 10 ^ -5 seconds short time discharge. Electrode material in contact with the material being welded portion is heated to 8000 ~ 25000 ° C, forming a plasma state of the molten metal, in metallurgical way the transition to the surface of the workpiece. Since between the electrode and the parent material to produce a plasma state forming alloying, diffusion into the interior of the workpiece, infiltrated, formation of a diffusion layer, to obtain a high strength weld layer. Triple multi-metal cold welding repair features: 1. Real cold welding, repair process without preheating the workpiece or insulation, surfacing machine instantly process no heat input, and thus the workpiece deformation, annealing, undercut and residual stress, does not change the state of the metal structure. 2. Repair access and high-strength, due to the arc electrode is ionized and transferred to the workpiece above its contacts in an instant, so the combination of high strength does not come off. 3. Repair of high precision coating thickness from a few microns to a few centimeters to a few millimeters, only grinding and polishing. Can also be turning, milling, planing, grinding, and plating and other post-processing. 4. Can a machine, can be welding repair, surface hardening, and other functions. 5. The economic practicality of high, field-line repair, improve productivity, save time and money. And easy to use, anyone can go through short-term training to operate using. 6. Use a wide-based materials, including various types of tool steel, stainless steel, tool steel, cast aluminum, aluminum alloy, copper alloy, nickel alloy, as well as all conductors can be conductive body. 7. environmental performance, no noise, dust, waste water, light, smell. 8. Fixed overlay even if they are worn, at the same site many times can repair welding. 9. The use of argon and other inert gas, can be repeatedly repaired surfacing. 10. The use of rotating rod, no reason, like sticky silk, operating high-quality surfacing, and margin surfacing layer can be controlled to a very small, thus saving finishing time.