Aluminum and aluminum alloy aluminum oxide is easier to oxidize than copper. It forms a dense and refractory alumina film with high melting point. It is difficult to melt during welding, hindering the fusion of matrix metal, easily causing weld metal slag, reducing mechanical properties and resistance. Corrosive; aluminum has a large gas absorption, liquid aluminum can dissolve a large amount of hydrogen, when it is rapidly cooled and solidified, hydrogen can not be precipitated, and pores are easily generated
The metal spraying of the diesel generator set uses a heat source to heat and melt the metal powder or the linear material, atomizes it into small metal particles by high-pressure, high-speed airflow, and sprays it onto the surface of the prepared part at a high speed of 100~300 m/s. A metal coating is formed. The sprayed coating is only mechanically adsorbed onto the substrate, while the base metal does not melt. Spraying is divided into oxygen-acetylene flame spraying, arc spraying, plasma spraying and explosive spraying according to the heat source used.
Diesel generator set pressure processing repair parts are the use of external force to plastically deform the metal, restore the geometry of the part, or move the metal of the non-working part of the part to the worn part to compensate for the worn metal and restore the original working surface of the part. Size and shape. According to the plasticity of metal materials, it is divided into two types: cold press processing at normal temperature and hot press processing under hot state.
Repair technology is one of the three basic technologies for mechanical equipment maintenance. Reasonable selection and application of repair technology is an effective measure to improve the maintenance quality of diesel generator sets, save resources, shorten downtime and reduce maintenance costs. There are many repairing methods for parts. Through long-term practice, mechanical processing, pressure processing, metal-spraying, welding repair, electroplating and-bonding are commonly used in production.
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