A device and method for induction heating assisted underwater laser cladding or material addition

Abstract

The invention provides an induction heating assisted underwater laser cladding or material adding device, the device includes a controller, the controller is connected with a laser, a robot, a wire feeder and an induction heating machine, the laser is connected with a laser head through an optical fiber, and the laser There is a laser welding torch directly under the head, and the laser head is also connected to the robot. The laser welding torch also has a wire feeding port, and a wire feeding tube is installed inside the wire feeding port. One end of the wire feeding tube extends into the laser welding torch, and the other It is docked with the wire feeder, and the welding wire is introduced into the wire feeding tube. There is an induction coil Ⅰ in the laser welding torch, and the induction coil Ⅰ is slidably connected to the transmission shaft through a connecting device. The stepping motor located outside the laser welding torch is connected, and the opening and closing of the stepping motor is controlled by the controller through the control system; the end of the induction coil I is connected to the induction heating machine through a waterproof cable passing through the wall of the laser welding torch, and the device can It is widely used in the field of underwater laser cladding / additive technology.

Description

technical field [0001] The invention belongs to the technical field of underwater laser cladding / material addition, and in particular relates to an induction heating-assisted underwater laser cladding / material addition device and a use method. Background technique [0002] In recent years, with the gradual scarcity of terrestrial resources and the rapid increase of the global population, the development of marine resources, especially deep-sea resources, has gradually deepened. Related marine structural engineering, such as offshore oil and gas platforms, submarine oil and gas pipelines and underwater maintenance of submarine space stations Homework is also increasing. As a large maritime country, my country's navy is developing rapidly at present. In order to ensure the rapid recovery of combat functions and combat effectiveness of damaged ship equipment in actual combat, and to realize the extension of ship equipment maintenance from shore-based fixed-point support to offs...

AI Technical Summary

Problems solved by technology

However, due to the difficulty of drainage in the construction site during the underwater local dry laser cladding / addition process, there is always a residual water layer on the surface of the workpiece to be repaired. The metal vapor is mixed to form aerosol particles, which absorb and scatter the laser beam, hinder the transmission of the laser, reduce the laser energy acting on the deposited metal and reduce the stability of the underwater local dry deposition / addition process. On the one hand, water vapor is ionized under the action of high-temperature plasma to form hydrogen ions and oxygen ions, and even directly decomposes into hydrogen and oxygen, resulting in the oxidation of high-temperature metals and the generation of pores in the molten pool, and the generation of oxide layers will cause cracks and induce welding. The formation of cracks; in addition, the absorption of water vapor on the laser beam and the cooling effect of the water environment will accelerate the cooling rate of the molten metal, resulting in a hardened structure, increasing the residual stress, and increasing the content of diffusible hydrogen, which in turn will cause cracking of the deposited metal, resulting in cracks and lead to porosity

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