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Aluminium is the third most abundant element in the earth's crust - a very light metal with a specific gravity only one-third that of steel. However, it has excellent mechanical properties compared to its weight. Thanks to this, its application can significantly reduce energy consumption in certain areas, including in aircraft manufacturing, since it does not matter at all how many tons the aircraft that needs to be lifted into the air is. In addition to its light weight, one of its favorable features is that it does not corrode. It can be made practically completely corrosion-resistant by painting, varnishing, anodizing or other surface treatment methods, which is a basic requirement in the case of tall buildings, for example. But even without treatment, its lifespan is several decades.

The quality of the basic materials used always affects the end result, whether it is construction, cooking or even furniture making. In the case of steel and non-ferrous metals, this is perhaps an even more important factor than elsewhere, moreover, the peculiarity of metallurgical products is that it is not always possible to produce a product that is completely compact and free of material discontinuity. If we do not want this to endanger the stability of a building or a vehicle, the selected basic materials must be carefully examined before they are used. There are destructive and non-destructive methods for testing materials - ultrasonic material testing belongs to the latter category.

When planning a project in the construction industry, machine industry or automotive industry, a number of factors must be taken into account, and one of the most important of them is the choice of the right materials, which greatly affects the quality of the final result and the economy of the project. It can be decisive how durable the selected materials are, how they react to extreme weather conditions, or what style they represent aesthetically. In case of steel, stainless steel materials and non-ferrous metals other aspects should also be taken into account, such as quality and availability.