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

A technology for containment and nuclear power steel, applied in arc welding equipment, manufacturing tools, welding equipment, etc., can solve the problems of unstable welding product quality, easily affected by the skill level and experience of welders, and poor welding environmental conditions.

Inactive Publication Date: 2018-01-23
CHINA NUCLEAR IND FIFTH CONSTR CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 ...

Method used

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

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with specific embodiment and accompanying drawing, set forth more details in the following description so as to fully understand the present invention, but the present invention can obviously be implemented in many other ways different from this description, Those skilled in the art can make similar promotions and deductions based on actual application situations without violating the connotation of the present invention, so the content of this specific embodiment should not limit the protection scope of the present invention.

[0026] Such as figure 1 As shown, the nuclear power containment includes modules such as the bottom head, the first ring of the cylinder, the second ring of the cylinder, the third ring of the cylinder, and the top seal. The length of the annular seam between the cylinders is about 1500m. The bottom head or top is also welded by two different parts, and the length of the circu...

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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, ...

Claims

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Application Information

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IPC IPC(8): B23K9/028B23K9/18B23K9/235
Inventor 程定富徐岩龙刘卫华杜斌朱平李珍陈修磊
Owner CHINA NUCLEAR IND FIFTH CONSTR CO LTD
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