Narrow gap groove of steel containment vessel of nuclear power station and automatic welding method thereof

Abstract

The invention discloses a narrow gap groove of a steel containment vessel of a nuclear power station and an automatic welding method of the narrow gap groove of the steel containment vessel of the nuclear power station. The narrow gap groove of the steel containment vessel of the nuclear power station comprises an upper groove, a lower groove and a bottom truncated edge, the top of the lower groove is connected to the bottom of the upper groove, and the bottom truncated edge is arranged at the bottom of the lower groove in a protruding mode. A pulse MAG automatic welding technology is adopted by the automatic welding method of the narrow gap groove. Compared with the prior art, due to the fact that the narrow gap groove is adopted on the steel containment vessel of the nuclear power station, filling volume for welding deposited metal is reduced, and welding cost is reduced; due to the fact that the pulse MAG automatic welding technology is used, multi-layer single-pass welding of the narrow gap groove is achieved, welding efficiency is improved, and the welding period of each welded junction is shortened.

Description

technical field [0001] The invention relates to a steel containment vessel of a nuclear power plant, more specifically, the invention relates to a narrow gap bevel of a steel containment vessel of a nuclear power plant and an automatic welding method thereof. Background technique [0002] In the existing nuclear power technology, steel containment is an important module on the critical path of nuclear power engineering construction. see figure 1 The steel containment vessel of a certain type of nuclear power plant has a diameter of about 40m and a height of about 65.6m. The entire containment vessel is welded by 260 arc-shaped steel plates 40 with an average thickness of about 44mm. Gr.B steel, the total weight of a single unit is 3359 tons. For the butt welds of the above-mentioned steel containment vessels, the traditional SMAW (Standard Arc Welding) process is currently used no matter on site or by the manufacturer. [0003] see figure 2 and image 3 , the existing ...

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Problems solved by technology

However, this welding method has the following disadvantages: 1) The groove 42 of the SMAW process is relatively wide, and the filling amount of the welding deposited metal is large, which not only consumes a large amount of welding materials, but also has a relatively long welding cycle; 2) the slope of the SMAW process The shape and size of the mouth determine that multi-level and multi-pass welding should be used for welding. Not only the welding workload is heavy, the welding environment is poor, but the welding quality is greatly affected by the level of the welder, and the quality of the weld 44 is difficult to guarantee.

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