Steps of friction welding Friction welding usually includes the following four steps: mechanical energy is converted into heat energy; 2. plastic deformation of the material; 3. thermoplastic forging pressure; 4. intermolecular diffusion and recrystallization. The biggest difference between the friction welding stage and the temperature of the traditional fusion welding metal is to increase the energy without reaching the melting point in the entire welding process, that is, the metal forging solid phase connection to achieve the thermoplastic state.
Friction welding is a reliable, repeatable, and reliable welding technique.
In the process of metal processing and high-speed rotation of machine tools , it is often found that the surfaces of two metal parts are welded together due to friction and heat. For example, in the turning process, a built-in chip is generated on the turning tool; in the drilling process, the drill bit and the workpiece are often bonded together; the sliding bearing is stuck due to combustion shaft and other reasons. Friction heat reduces the strength of the metal, but increases its plasticity.
New developments in high-energy density fusion welding technology have greatly improved the weldability of materials, allowing many materials and structures that are difficult to weld by other methods to be welded. Thompson invented resistance welding in the United States for spot welding and seam welding of thin plates. Weld welding is the earliest semi-mechanical welding method in pressure welding.
The 50 ~ 60mm steel plate can be welded and formed at one time, the welding speed can reach more than 0.4m / min, and the deposition speed is more than 100 times that of electrode arc welding. The second method is to reduce the cross-section of the trench and the metal cladding. If the thickness of the steel plate is 50 ~ 300mm, the gap can be designed to be about 13mm.
Welding defects refer to defects that do not meet the design or process requirements during welding. Its main manifestations are welding cracks, blowholes, undercuts, not fully penetrated, not fused, slag inclusions, welding, collapse, pits, burn-through, inclusions, etc.
During the balancing and welding process, a pair of inclined tubes and the inner expandable gasket are crimped tightly to concentrate the radial pressure. Under the action of radial force and high temperature, ring welding is adopted on both sides of the pipeline .
It provides domestic and foreign users with different types of friction stir welding industrial products and different uses, including: aerospace tubular structural parts, aviation thin-walled structural parts, ship wide-ribbed plates, high-speed train body structure, large thickness radar panels , Car wheel, container configuration file support, radiators and heat sinks of various structures.
The shape of the weldment extends from a typical circular shape to a non-circular shape (linear friction welding) and a sheet shape (friction stir welding). The shape of the aluminum alloy friction stir welded joint will change with the different process parameters and welding conditions, showing the difference in nugget structure and area.
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