Casting performance and repair methods

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Casting performance and use: casting has excellent mechanical and physical properties, it can have a variety of different strength, hardness, toughness with the overall performance, but also combines one or more special properties, such as wear-resistant, high temperature and Low temperature, corrosion-resistant and so on. Casting weight and size range are wide, the lightest weight only a few grams, the heaviest can reach 400 tons, the thinnest wall thickness of only 0.5 mm, the thickest can be more than 1 m, the length of a few millimeters to ten meters, To meet the requirements of different industrial sectors. Casting defects how to repair: castings due to many factors, often appear pores, pinholes, slag, cracks, pits and other defects. Commonly used repair equipment for the TIG welding machine, resistance welding machine, cold welding and so on. For the quality and appearance of the less demanding casting defects can be used such as argon arc welding machine heat, welding speed to repair. However, in the field of precision casting defects repair, due to argon welding heat effect, repair will cause the deformation of castings, hardness reduction, trachoma, local annealing, cracking, pinholes, abrasion, scratching, undercutting, Stress damage and other secondary defects. Cold welding just overcome the above shortcomings, the main advantages of its heat-affected area is small, casting without preheating, cold repair at room temperature, so no distortion, undercutting and residual stress, will not produce local annealing, does not change the metal casting Organization status. Cold welding machine therefore suitable for precision casting surface defects repair. Cold welding welding repair range of Φ1.5-Φ1.2mm welding point melting process of melting, in the process of repairing large area defects, the repair efficiency is the only factor restricting its wide application. For large defects, recommend a traditional welding repair process and casting defect repair machine composite applications. How to detect the hardness of the castings: The properties of the castings themselves directly affect the quality of the finished products, of which the hardness value is an important indicator of casting processing. 1. Brinell hardness: mainly used to determine the hardness of castings, forgings, non-ferrous metal parts, hot-rolled blanks and annealed parts, measuring range ≯ HB450. 2 Rockwell hardness: HRA is mainly used for high hardness test pieces, hardness and HRC67 above the hardness of the material and surface hardness determination, such as cemented carbide, nitrided steel, the determination of HRA> 70. HRC is mainly used for the determination of the hardness of steel parts (such as carbon steel, tool steel, alloy steel, etc.) after quenching or tempering, measuring range HRC20 ~ 67. 3. Vickers hardness: used to determine the hardness of thin parts and steel parts, but also can be used to determine carburizing, cyanide, nitriding and other hard-surface hardness of the workpiece.

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