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    LAMEF
    UNIDADE EMBRAPII

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    CHÂTEAU

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    LAMEF
    UNIDADE EMBRAPII

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    FLEXIBLE RISERS

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    FLEXIBLE RISERS

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    FRICTION WELDING MACHINES

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    Floating hoses

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FRICTION WELDING

Friction welding is a joining process that does not involve fusion (solid state). The joints produced are essentially the result of the plastification of the metal components heated by friction. As a consequence, it is expected a reduced impact on the metallurgical characteristics of the materials involved and therefore on their mechanical behavior.

Since 2009, LAMEF carries out research on several friction welding processes. The experience accumulated in the last years gives the opportunity to the staff to design friction welding equipment, optimize welding parameters and establish the final welding procedure according to the joint geometry and materials involved.


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Friction Hydro pillar Process – FHPP

Friction Hydro pillar Process is a welding technique that allows joining and repairing of cracks and defects in metal structures. The process involves the rotation of a rod under an applied axial load in an pre-drilled hole. The generation of frictional heat promotes plastification of the materials and metallurgical bonding.

The process is easily automated and capable of producing high quality joints with repeatability. It can be safely operated remotely, which opens the opportunity to be used in hostile environment, such as in repairing of pipelines, gas lines and offshore and onshore plant components and structures. Besides the optimization of welding parameters, LAMEF is also capable of designing and building customized equipment.

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Friction taper stitch welding (FTSW).

This friction welding process is primarily used to repair cracks and defects in metallic materials by overlapping individual repairs carried out by Friction Hydro pillar.

This method is derived from the Friction Hydro Pillar Process, which is used for repairing a local damage. Being a variation of this process, in FTSW overlapping welds are used to repair planar defects. When a point damage progresses leading to crack growth, a planar defect is produced in the material. In these cases, the use of overlapping welds can be a viable solution for the repair of extended defects.

Friction Welding of Pipes

This is a process that can be used to weld pipes by friction through the application of an axial force against a ring that rotates and dissipates heat. LAMEF developed a prototype equipment to weld pipes of potentially any metallic material with external diameters ranging from 8 to 16 inches and up to 12 meters long.

The welding of pipes is a critical process for the oil and gas industry due to the high complexity of the current welding process used and also due to the demanding technical specifications required. The quality of conventional welding processes commonly used to join pipes are directly related to the ability of the welder and therefore it is expected a high degree of variability.

This process is performed by drilling sequential holes on the material to be repaired. Then, a series of interlinked rods are welded by friction filling the region of interest. During the welding process the material is subjected to low temperatures and thermal cycles in comparison to conventional techniques involving fusion of the materials (i.e. arc welding process).

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Friction Stir Welding – FSW

FSW is a linear friction welding process conceived in 1991 at the TWI research center. In this process a rotating tool is pressed against two clamped plates and then moved along the interface to produce the welding line. This method allows the welding of similar and dissimilar materials in many overlapped and butt configurations with different length and thickness.

LAMEF has carried out in the last 14 years research on this area in partnership with a reference research center in solid state welding processes in Germany. As a consequence of this partnership, our staff has accumulated experience in friction welding processes ranging from project planning, optimization of welding parameters and joints mechanical and metallurgical characterization.