Automatic underwater welding maintenance equipment

Abstract

The invention provides automatic underwater welding maintenance equipment comprising a spindle. Two air-bag supports are symmetrically arranged at two ends of the spindle and respectively provided with an air bag, a welding space is formed between the air-bag supports, a barrel capable of axially moving is arranged in the welding space, an air inlet pipe and a drainage pipe are arranged on the barrel, the drainage pipe is communicated with the welding space and a drainage space on the outer side of the air-bag supports, and a welding device is arranged in the barrel. Due to the fact that the welding space is isolated through the air bags, and water in the welding space is discharged under the action of the air inlet pipe and the drainage pipe, a partially-dried type working environment is established; welding seams are repaired through the welding device by which affect of a water environment upon operation of parts is effectively avoided, risk of the parts being subjected to radioactive contamination is lowered, and stability of a welding process and repairing quality of the welding seams are guaranteed.

Description

technical field [0001] The invention relates to welding equipment, in particular to an underwater automatic welding maintenance equipment used for repair welding and surfacing welding of safety end weld seams of nuclear power plant pressure vessels. Background technique [0002] In nuclear power plants, the connection weld between the reactor pressure vessel and the main pipeline mainly involves dissimilar alloy welds between the pressure vessel nozzle and the safe end, and the same alloy weld between the safe end and the main pipeline. Due to the complex metallurgical transformation process in the manufacturing process, the above-mentioned dissimilar alloy welds become the weak link of the entire pressure vessel. At the same time, during the operation of the nuclear power plant, the dissimilar alloy welds are subjected to high temperature, high pressure, high radiation and high-speed water flow. The inner wall is prone to damages such as pitting corrosion, knife corrosion, ...

AI Technical Summary

Problems solved by technology

This system mainly utilizes the stability of the laser underwater, and realizes underwater repair welding by constructing a dynamic local dry environment through the end-moving drainage air cavity. However, the on-site installation and process control of this technology are complicated, and the maintenance cost is extremely high.

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