Friction welding application note

- May 14, 2018 -

In recent years, in order to protect the environment and save energy, people strongly hope that vehicles such as automobiles, airplanes, locomotives, and ships will be light-weighted. For this reason, we actively develop and develop light metal materials suitable for these transportation machines, such as aluminum and its aluminum alloys.

Aluminum and its aluminum alloy materials have advantages such as light weight, corrosion resistance, and easy forming. With the appearance of new types of hard aluminum and super hard aluminum materials, the performance of these materials has been continuously improved, resulting in aviation, aerospace, and high-speed trains. High-speed ships, automobiles and other industrial manufacturing fields have been more and more widely used. In addition to transport machinery, aluminum and its aluminum alloys have also been introduced into civil engineering and bridges.

The mounting connection of these structures is mainly based on welding as the main connection. In the welding of aluminum and its alloys, one of the main problems is that due to its large expansion coefficient, it generates a large deformation during welding. In order to prevent deformation, it must be fixed on the construction site and be trained by skilled workers. Because aluminum and its alloys are easily oxidized, there is a dense, strong and infusible oxide film on the surface. Therefore, it is required to remove the film on the surface before welding. When welding, use inert gas such as argon for protection. When aluminum and aluminum alloys are welded, defects such as blowholes and hot cracks are easily generated, which is also a problem that must be paid attention to when welding. For the heat-treated aluminum alloy, it is necessary to avoid the problem of softening and strength reduction in the heat-affected zone during welding. In order to solve the above problems in the fusion welding of aluminum and aluminum alloys, a new solid-phase welding method, friction stir welding, was developed.


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