(1) Welding. Including: surfacing welding (which can repair the wear of non-fitting parts and parts that can be processed to their original shape after surfacing), spot welding (which can eliminate the need for connecting fasteners and repair welding of local scratches and grinding), repair welding (Compensation for wear) Plasma welding, spontaneous combustion welding (suitable for field operations).
(2) Brush plating, also known as tankless plating. This is a mature technology that has been used for 30 years. It can repair local wear of parts, especially large parts, with simple facilities. In recent years, brush plating technology has made new progress. For example, nanobrush plating technology can greatly improve the mechanical properties of the coating.
(3) Spraying technology. It can not only compensate for the wear of parts and restore geometric dimensions, but also improve the surface properties of parts. For example, special materials are sprayed on different base materials to achieve anti-corrosion, wear-resistant and other effects. Nowadays, spraying technology is developing rapidly. In February 2004, the research topic "Research and Application of High-Efficiency Supersonic Plasma Spraying Technology" of the National Defense Science and Technology Key Laboratory of Equipment Remanufacturing Technology of the Armored Forces Engineering College won the second prize of the 2005 National Technology Invention Award and the second prize of the National Science and Technology Progress Award. . In addition, cold spraying has also appeared in recent years (thermal spraying has its disadvantages: the sprayed material is oxidized).
(4) Stick coating technology. Composite materials composed of high molecular polymers or inorganic compounds and special fillers are used to coat the surface of worn parts. After curing and mechanical processing, the size and accuracy of the parts can be restored and the original performance can be achieved. This method is especially suitable for repairing large parts. For example, Xuzhou Engineering Machinery Group Co., Ltd. applied adhesive coating technology (resin plus curing agent, processed after 24 hours) to eliminate large-area wear on the inner wall of the 500t press cylinder (φ500mm×1300mm), causing serious failure of oil leakage and pressure reduction between the cylinder pistons. The repair cost is only 1/20 of the replacement cost.
(5) Bonding technology. Bonding technology includes bonding materials and bonding processes. At present, bonding materials have formed a family, which is divided into several series according to different bonding materials and uses. Each series is divided into different specifications and has a wide range of applications. The typical example is Germany, with more than 900 species. The bonding strength is not lower than the strength of the base material. For example, on the A380 aircraft, one-third of the parts are bonded with glue. In addition, patch technology (industrial band-aid, used to repair pipeline leaks) has emerged in industry.
