Aluminum alloy introduction:
Aluminum alloy is one of the most widely used non-ferrous metal structural materials in the industry and has been widely used in aviation, aerospace, automotive, machinery manufacturing, marine and chemical industries.
With the rapid development of the industrial economy, the demand for aluminum alloy welded structural parts is increasing, and the research on the weldability of aluminum alloys is also deepened.
Aluminum alloys are currently the most widely used alloys.
The density of pure aluminum is small (ρ=2.7g/cm3), which is about 1/3 of iron.
Low melting point (660 ° C)
Aluminum is a face-centered cubic structure, so it has a high degree of plasticity (δ: 32~40%, ψ: 70~90%)
It is easy to process and can be made into various profiles and plates with good corrosion resistance.
However, the strength of pure aluminum is very low, and the annealing state σb value is about 8kgf/mm2, so it is not suitable as a structural material.
Through long-term production practices and scientific experiments, people gradually strengthened aluminum by adding alloying elements and applying heat treatment, which resulted in a series of aluminum alloys.
The alloy formed by adding certain elements can have higher strength while maintaining the advantages of pure aluminum, and the σb value can reach 24 to 60 kgf/mm2, respectively.
This makes its “specific strength” (ratio of strength to specific gravity σb / ρ) better than many alloy steels, becoming an ideal structural material, widely used in machinery manufacturing, transportation machinery, power machinery and aviation industry, aircraft fuselage , skins, compressors, etc. are often made of aluminum alloy to reduce their own weight.
The use of aluminum alloy instead of steel plate welding can reduce the structural weight by more than 50%.
The aluminum alloy has low density, but high strength, close to or exceeds high-quality steel, good plasticity, can be processed into various profiles, has excellent electrical conductivity, thermal conductivity and corrosion resistance. It is widely used in industry and is used second only to steel. .
Some aluminum alloys can be heat treated to achieve good mechanical properties, physical properties and corrosion resistance.
Hard aluminum alloy belongs to AI-Cu-Mg system, generally contains a small amount of Mn, which can be heat treated and strengthened. It is characterized by high hardness but poor plasticity. Superhard aluminum is a Cu-Mg-Zn system, which can be heat-treated and strengthened. It is the highest strength aluminum alloy at room temperature, but has poor corrosion resistance and high temperature softening.
The wrought aluminum alloy is mainly an Al-Zn-Mg-Si alloy. Although it has many kinds of elements, it has a small content, so it has excellent thermoplasticity and is suitable for forging, so it is also called forged aluminum alloy.
The aluminum alloy has low density, but high strength, close to or exceeds high-quality steel, good plasticity, can be processed into various profiles, has excellent electrical conductivity, thermal conductivity and corrosion resistance. It is widely used in industry and is used second only to steel. .
Some aluminum alloys can be heat treated to achieve good mechanical properties, physical properties and corrosion resistance.
Hard aluminum alloy belongs to AI-Cu-Mg system, generally contains a small amount of Mn, which can be heat treated and strengthened. It is characterized by high hardness but poor plasticity. Superhard aluminum is a Cu-Mg-Zn system, which can be heat-treated and strengthened. It is the highest strength aluminum alloy at room temperature, but has poor corrosion resistance and high temperature softening.
The wrought aluminum alloy is mainly an Al-Zn-Mg-Si alloy. Although it has many kinds of elements, it has a small content, so it has excellent thermoplasticity and is suitable for forging, so it is also called forged aluminum alloy.The aluminum alloy has low density, but high strength, close to or exceeds high-quality steel, good plasticity, can be processed into various profiles, has excellent electrical conductivity, thermal conductivity and corrosion resistance. It is widely used in industry and is used second only to steel. .
Some aluminum alloys can be heat treated to achieve good mechanical properties, physical properties and corrosion resistance.
Hard aluminum alloy belongs to AI-Cu-Mg system, generally contains a small amount of Mn, which can be heat treated and strengthened. It is characterized by high hardness but poor plasticity. Superhard aluminum is a Cu-Mg-Zn system, which can be heat-treated and strengthened. It is the highest strength aluminum alloy at room temperature, but has poor corrosion resistance and high temperature softening.
The wrought aluminum alloy is mainly an Al-Zn-Mg-Si alloy. Although it has many kinds of elements, it has a small content, so it has excellent thermoplasticity and is suitable for forging, so it is also called forged aluminum alloy.
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