Small-caliber pipe inner wall laser bead welding device

Abstract

The invention provides a small-caliber pipe inner wall laser bead welding device. The small-caliber pipe inner wall laser bead welding device comprises a laser emitting device and a circumferential reflecting focusing device. The emitting end of the laser emitting device is provided with a protective gas communication pipe which is connected with one end of a small-caliber pipe. The circumferential reflecting focusing device can be inserted into an inner cavity of the small-caliber pipe from the other end of the small-caliber pipe, the back end of the circumferential reflecting focusing device is connected with a linear driving mechanism, and the front end of the circumferential reflecting focusing device is provided with a conical cambered surface reflecting focusing lens opposite to the emitting end of the laser emitting device. The side wall of the protective gas communication pipe is provided with a gas inlet connected with a protective gas pipeline. The small-caliber pipe inner wall laser bead welding device can be used for carrying out automatic bead welding on the small-caliber metal pipe, a non-metal pipe and a composite pipe, can be used for field maintenance, and can also be used for factory production of composite pipes. The small-caliber pipe inner wall laser bead welding device is very wide in application range, good in bead welding quality and low in cost.

Description

technical field [0001] The invention relates to the technical field of laser processing, in particular to a laser surfacing equipment for the inner wall of a small-diameter tube. Background technique [0002] Surfacing welding on the inner wall of small-diameter pipes is a difficult problem in the field of welding technology. At present, there is still no welding method that can solve this problem well. The reason is mainly due to the inherent structure of the equipment execution terminal unit (welding gun, welding torch) The lower limit of its shrinkable size is limited, so it is difficult to enter small-diameter pipes such as steam generator heat transfer tubes of pressurized water reactor nuclear power plants, heat transfer tubes of heat exchangers, and chemical condensation pipes for surfacing or repair welding operations. At present, such small-diameter pipeline maintenance mainly adopts pipe plugging, liner pipe cutting and replacement, and these maintenance methods ha...

AI Technical Summary

Problems solved by technology

[0002] Surfacing welding on the inner wall of small-diameter pipes is a difficult problem in the field of welding technology. At present, there is still no welding method that can solve this problem well. The reason is mainly due to the inherent structure of the equipment execution terminal unit (welding gun, welding torch) The lower limit of its shrinkable size is limited, so it is difficult to enter small-diameter pipes such as steam generator heat transfer tubes of pressurized water reactor nuclear power plants, heat transfer tubes of heat exchangers, and chemical condensation pipes for surfacing or repair welding operations. At present, such small-diameter pipelines are mainly repaired by plugging, lining, cutting and replacing, and these maintenance methods have disadvantages such as reduced heat transfer efficiency, poor reliability, high maintenance costs, and long maintenance periods.

In addition, in the industrial field, due to the requirements of working conditions, it is often necessary for the inner wall of the pipe to have corrosion resistance and wear resistance. During production, in order to ensure special service performance, small-diameter pipes are often made of expensive single materials such as stainless steel, nickel-based alloys, and some rare metals, resulting in difficult processing of small-diameter pipes with special properties, high manufacturing costs and resources. serious waste

At present, there are few relatively cheap small-diameter composite metal pipes with inner lining and welding layer on the market.

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