Steel nuclear power containment circular seam submerged arc automatic horizontal welding process

Abstract

The invention provides a steel nuclear power containment circular seam submerged arc automatic horizontal welding process. By means of the process, the quality of welded products is stable. The process comprises the steps of (1) determining pre-welding grooves and preparing welding materials; (2) assembling welded parts within the assembly interval range of 0-10 mm and the alignment tolerance range of 0-7 mm; (3) preheating a weld joint between the welded parts at the preheating temperature greater than or equal to 75 DEG C, wherein the preheating width on the two sides of the weld joint is greater than or equal to twice as thick as the welded parts and is greater than or equal to 100 mm; (4) conducting backing welding on the grooves and the truncated edge of the root of the weld joint between the welded parts to form a backing welding pass, conducting multi-layer and multi-pass welding pass filling welding on the grooves on the front side and the back side to form filling welding passes, conducting multi-layer and multi-pass covering welding on the grooves on the front side and the back side to form covering welding passes, controlling the temperature between welding layers to be93-200 DEG C in the welding process and taking measures to control welding deformation in the welding process; and (5) conducting weld joint detection and determining whether the weld joint is qualified.

Description

technical field [0001] The invention relates to a welding process, in particular to a welding process for a nuclear power steel containment vessel. Background technique [0002] A reactor-type nuclear power plant adopts a double-layer containment structure composed of a steel containment vessel and a concrete shell. The steel containment vessel (CV) has a diameter of about 40m and a height of about 65.6m. The plates are made of SA738Gr.B, and the length of the butt weld is about 3400m; the inner diameter of the cylinder is 39.624m, and the height of the cylinder is 42.735m. It is composed of 11 ring plates, each ring is composed of 12 ring plates, and the total weight is about 1870 tons. The seam length is about 316m. [0003] The existing containment prefabrication and on-site assembly adopt electrode arc welding process. This welding process has low construction efficiency, high labor intensity (such as frequent replacement of electrodes, difficult cleaning of weld bead, ...

AI Technical Summary

Problems solved by technology

[0003] The existing containment prefabrication and on-site assembly adopt electrode arc welding process. This welding process has low construction efficiency, high labor intensity (such as frequent replacement of electrodes, difficult to clean the weld bead, etc.), poor welding environment conditions, and low utilization rate of welding materials. and other shortcomings

On the other hand, the quality of welding products is unstable and is easily affected by the skill level and experience of welders

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