Groove for automatic welding of nuclear power station and automatic welding method

Abstract

In the invention, in order to realize single-channel multi-layer welding of automatic welding, a 3 V groove is adopted on a main pipeline of which the wall thickness is more than 85 mm, and twice closing is performed during the automatic welding so as to ensure that the width of the top welding bead is not less than 10.5 mm. The invention relates to a groove for the automatic welding of a nuclearpower station and an automatic welding method, wherein the groove comprises an upper groove, a middle groove and a lower groove; the bottom of the upper groove is connected with the top of the middlegrove; the bottom of the middle groove is connected with the top of the lower groove; the bottom of the lower groove is provided with a protruding bottom truncated edge; the height of the bottom truncated edge is between 1.5 and 2.5 mm; the width of the bottom truncated edge is between 3 and 3.5 mm; the width of the top of the upper groove is between 9.5 and 10.5 mm; the width of the top of the middle groove is between 8.0 and 9.0 mm; the width of the top of the lower groove is between 6.5 and 7.5 mm; the height of the lower groove is between 12 and 18 mm; and the height of the middle groove is between 45 and 55 mm. In the invention, in order to realize the single-channel multi-layer welding of the automatic welding, the 3 V groove is adopted on the main pipeline of which the wall thickness is more than 85 mm, and the twice closing is performed for the automatic welding so as to ensure that the width of the top welding bead is not less than 10.5 mm.

Description

technical field [0001] The invention relates to the technical field of nuclear power, more specifically, to a pipe bevel for automatic welding of nuclear power plant pipes and a method for automatic welding of nuclear power plant pipes. Background technique [0002] Automatic welding technology is an advanced welding technology, which has been widely used in equipment manufacturing, petrochemical and other fields. In the construction stage of nuclear power plants, the automatic welding of narrow gaps can not only greatly reduce the cross-sectional area of ​​the groove, greatly reduce the filling amount of welding metal, but also achieve high-efficiency welding with a small welding heat input. At the same time, automatic welding eliminates the influence of human factors to the greatest extent, and the welding quality is more stable than manual welding. Therefore, the advantages of automatic welding in the welding process of the main pipeline of nuclear power plants are more ...

AI Technical Summary

Problems solved by technology

[0004] Double V grooves can be used for main pipes with a wall thickness less than 85mm, but for main pipes with a wall thickness greater than 85mm, the use of double V grooves cannot meet the standard that the maximum width of each weld bead is not greater than 10.5mm. Design a new pipe groove for the main pipe with a thickness greater than 85mm to better reflect the advantages of automatic welding

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