Why aluminium is used for joining railway track?

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Answer

This reduction property of aluminium is used in thermite welding for joining the broken pieces of heavy iron objects like girders, railway tracks or cracked machine parts. ... Aluminium reduces iron oxide to produce molten iron metal with the evolution of heat.

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Because aluminium is more reactive than iron  this helps in thermite reaction..

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Aluminium produce such reaction is in the molten state from which is used to join railway tracks or cracked machine parts.

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It is very reactive metal so it is used for joining railway tracks .

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Because when aluminium become longer when heat is given.

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Introduction:
Aluminium is widely used for joining railway tracks due to its various advantageous properties. This material possesses unique characteristics that make it suitable for this application. In this response, we will explore the reasons why aluminium is used for joining railway tracks in detail.

Lightweight:
One of the primary reasons for using aluminium for joining railway tracks is its lightweight nature. Aluminium is significantly lighter than other common materials used for this purpose, such as steel. This property allows for easier handling, transportation, and installation of railway tracks. The reduced weight also helps in lowering the overall load on the track structure, resulting in better efficiency and reduced wear and tear.

Corrosion Resistance:
Aluminium exhibits excellent corrosion resistance, making it highly suitable for outdoor applications like railway tracks. Unlike steel, aluminium does not rust when exposed to moisture and atmospheric conditions. This property ensures the longevity and durability of the track joints, reducing the need for frequent maintenance and replacement. It also helps in maintaining the structural integrity of the track system over a longer period.

Thermal Expansion:
Another significant advantage of aluminium for joining railway tracks is its thermal expansion properties. Aluminium expands and contracts at a higher rate than steel when subjected to temperature changes. This characteristic allows the track joints to accommodate thermal expansion and contraction, reducing the risk of buckling or warping. With the ability to withstand temperature variations, aluminium track joints can maintain their stability and functionality in different weather conditions.

Cost-Effectiveness:
Aluminium offers cost-effectiveness in terms of installation, maintenance, and overall lifecycle costs. Its lightweight nature makes it easier and less expensive to transport and handle during installation. Additionally, the corrosion resistance reduces the need for frequent maintenance, resulting in lower upkeep expenses. The long lifespan of aluminium track joints further contributes to cost savings by reducing the frequency of replacements.

Electrical Conductivity:
Aluminium possesses excellent electrical conductivity, making it suitable for railway tracks. The conductivity of aluminium allows for efficient transmission of electrical signals and currents, which is crucial for various railway operations, including signaling and communication systems. The use of aluminium in track joints ensures reliable electrical connections throughout the railway network.

Conclusion:
In conclusion, aluminium is used for joining railway tracks due to its lightweight nature, corrosion resistance, thermal expansion properties, cost-effectiveness, and electrical conductivity. These advantages make aluminium a preferred material for ensuring the longevity, stability, and efficient functioning of railway track systems.

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