Because aluminum jet boat aluminum alloy is used in marine and ship fields, it has stricter process requirements and performance standards than other ordinary aluminum alloy products.The principle of selection of aluminum jet boat alloy materials can be divided into four aspects:
One is that it has high specific strength and specific modulus. The structural strength and size of ships are closely related to the yield strength and elastic modulus of the material. Since the elastic modulus and density of aluminum alloys are roughly the same, the addition of alloying elements also has little effect. Therefore, increasing the yield strength within a certain range will reduce the yield strength of the ship. The boat structure is strong. It is often difficult for high-strength aluminum alloys to have excellent corrosion resistance and weldability at the same time. Therefore, marine aluminum alloys are generally medium-strength, corrosion-resistant and weldable alloys.
The second is excellent welding performance. At present, the automatic argon arc welding method is mainly used in ships. Good weldability means that the tendency of cracks formed during welding of aluminum alloys is smaller, which means that aluminum alloys must have good welding crack resistance. Because under shipbuilding conditions, the lost welding performance cannot be restored by heat treatment again.
The third is excellent corrosion resistance. Ship structures are used in harsh seawater media and marine environments. Therefore, corrosion resistance is one of the main signs of marine alloys. The fourth is that aluminum alloy has good cold and hot forming properties. Because of the multiple treatments of cold processing and hot processing in shipbuilding, marine aluminum alloys must be easy to process and form, without crack defects, and still meet the strength and strength after processing. Corrosion resistance requirements.
The selection of marine aluminum alloys is relatively strict. Currently, aluminum alloy products such as 5083, 5086, 5454, 5754, and 6061 are mostly used. In practical applications, the advantages of marine aluminum alloys are very obvious. The first is the small proportion, which can reduce the weight of the ship, save energy consumption, and increase the load; the second is the good corrosion resistance, reduce the cost of oiling, and extend the service life; the third is the welding and processing formability, which is conducive to later processing; finally aluminum The waste is easy to recycle and can be recycled. At the same time, it does not burn and is safe in case of fire.