Inner bore welding structure and welding method for fountain type pipe layout

Abstract

Disclosed is an inner bore welding structure and a welding method for fountain type pipe layout. Because the bending radius and the length of heat exchange pipes are almost different, and the difficulty of pipe inserting and assembly is large; the heat exchange pipes interfere with each other, wrong welding of the heat exchange pipes with different specifications or welding-missed joint of a heatexchange pipe both cannot be repaired; and the order and direction of the pipe layout are irregular, the operation space is narrow, and difficulty is large. The inner bore welding structure for the fountain type pipe layout comprises a pipe plate (1) and a heat exchange pipe (3), the junction of the pipe plate and the heat exchange pipe is provided with a step (2), and a welding portion (4) of thepipe plate and the heat exchange pipe adopts an all-position welding.

Description

Technical field: [0001] The invention relates to an inner hole welding structure and a welding method of a fountain-type distribution pipe, and belongs to the technical field of inner hole welding. Background technique: [0002] There is a gap between the conventional welded structure pipe and the tube plate hole, which is prone to gap corrosion, overheating and other problems; the thermal stress generated at the welded joint may cause stress corrosion and cracking, and the expansion joint structure has a large participation due to expansion joint deformation. Stress is easy to cause stress corrosion, and when the service temperature is high, the residual stress of the expansion joint is relaxed due to the creep of the material, causing the joint to loosen or fall off, resulting in leakage. [0003] The inner hole welding structure can avoid the gap between the tube and the tube sheet in the working condition, prevent the accumulation of corrosive medium, and effectively red...

AI Technical Summary

Problems solved by technology

This method of pipe layout brings great difficulty to inner hole welding. Since the bending radius and length of the heat exchange tubes are almost different, it is difficult to thread and assemble the tubes; the heat exchange tubes interfere with each other, and welding of different specifications is wrong. The heat exchange tubes or one of the heat exchange tubes cannot be repaired; the sequence and direction of the tube layout are irregular, the operation space is narrow and difficult, and it is difficult to repair welding defects; after a certain number of heat exchange tubes are welded, there is no operation space in the central tube area and visual conditions, which brought the following problems: a. The pipe guide head cannot be taken out; b. The area to be welded cannot be cleaned; c. The tungsten electrode of the welding torch cannot be adjusted to a suitable position; d. The rear argon shield cannot be installed; e. Welding quality cannot be visually inspected; f. Welding defects cannot be repaired

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