Underwater steel construction crackle friction stitch welding renovation method and equipment

Abstract

The invention relates to a friction stitch welding repairing method for the underwater steel structure cracks and the device, wherein, the friction stitch welding method is as follow: a stopper (2) rotating at high speed is inserted in the preboring welded hole (11) and is applied with axial pressure; the contacting interface of the welded hole (11) and the stopper (2) is heated and melted to form a plurality of welding units (3) through crystallization and metallurgical reaction; the welding units (3) are overlapped with each other to form a complete stitch welding seam (4). The repairing device for the underwater steel structure cracks adopts the friction stitch welding method and comprises a plurality of underwater components and a plurality of above-water components, wherein, the underwater components comprise a friction spindle head (5), an underwater operational manipulator (6), an automatic tool magazine (7), a tool changer (8) and an underwater teleoperator (9); the above-water components comprise a hydraulic power system, an electric control system and a data acquisition system. The device adopting the friction stitch welding method has the advantages of excellent welding quality, simple structure, reliability and easy operation, low cost and easy use, maintenance and repair.

Description

technical field [0001] The invention relates to an underwater welding method and its repairing equipment, especially a solid-state welding method and equipment for realizing connection. Background technique [0002] Friction welding is under the action of pressure, through the friction of the interface to be welded, the temperature of the interface and its vicinity will increase, the deformation resistance of the material will decrease, the plasticity will increase, and the oxide film on the interface will be broken. A solid-state welding method that realizes the connection through diffusion and recrystallization metallurgical reactions. Friction welding has outstanding advantages such as high joint quality, suitable for connection of dissimilar materials, high production efficiency, high dimensional accuracy, easy mechanization and automation of equipment, and clean environment. In particular, for some occasions where arc welding is difficult to apply, such as the repair o...

AI Technical Summary

Problems solved by technology

[0005] For the cracks of the platform underwater tubular pile foundation, there are some problems in the application of the underwater repair technology currently used: not only the long-term reliability of the mechanical connector in underwater applications has not been eliminated, but also the cracks near the platform Accurate positioning and installation are very difficult; wet welding and local dry welding are usually only used in shallow waters below 60m; dry high-pressure welding can obtain high-quality joints, but the arc is difficult to stabilize when the water depth reaches 300m, especially because of the steel structure Different from regular submarine pipelines, not only the structure is complex but also the working space is very limited. It is necessary to use a series of assembled high-pressure welding cabins to surround the steel structure to be welded. The whole system is very complicated, time-consuming and expensive to install

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