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
Welding repairs on diesel generator steel workpieces are mainly for repairing cracks and compensating for wear dimensions. Due to the wide variety of steels, various elements contained in the weld will have a certain influence on the weld repair, so the weldability varies greatly. Among them, the change in carbon content is the most significant. Low carbon steel and low carbon alloy steel have less tendency to harden during weld repair and have good weldability; weldability decreases with increasing carbon content
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.
Welding repair of diesel generator set refers to the use of welding technology in the maintenance of generator equipment. Welding repair makes the matric and electrode powder melt together under the action of heat energy and get good intergranular bonding strength. However, the influence of heat energy will change the microstructure and shape of the matric, which is the key problem of welding repair.
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