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AP1000 main steam pipeline welding method

A welding method and main steam technology, applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve problems such as hidden dangers to the health and safety of operators and difficult installation of inflatable protection devices.

Inactive Publication Date: 2017-12-12
CHINA NUCLEAR IND FIFTH CONSTR CO LTD
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Problems solved by technology

[0004] In order to solve the problems of difficulty in installing the inflatable protection device and potential safety hazards to the health of operators when the conventional inflatable protection device is used for auxiliary welding of the AP1000 main steam pipeline, the invention proposes a welding method for the AP1000 main steam pipeline

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Embodiment 1

[0059] Embodiment 1, groove parameters: the height of the blunt side of the groove is 1.5 mm, and the radius of the arc at the root of the groove is 2.0 mm. Bottom welding parameters: the welding current in the area corresponding to the 6 o'clock-4 o'clock and the 6 o'clock-8 o'clock scale is 140A, and the argon gas flow rate is 20L / min; the welding current in the area corresponding to the 4 o'clock-3 o'clock and 8 o'clock-9 o'clock scale The welding current is 125A, the argon gas flow rate is 18L / min; the welding current in the area corresponding to the 3 o’clock-1 o’clock and the 9 o’clock-11 o’clock scale is 120A, and the argon gas flow rate is 15L / min; 1 o’clock-12 o’clock and 11 o’clock-12 o’clock The welding current in the area corresponding to the scale is 115A, and the flow rate of argon gas is 13L / min. Filler welding and cover welding parameters: the diameter of the welding wire is 2.4mm, the welding current is 180A, the welding voltage is 25V, and the welding speed i...

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Abstract

The invention belongs to the technical field of AP1000 nuclear power, and particularly relates to an AP1000 main steam pipeline welding method. In order to solve the problems that an air filling protection device is difficult to install and potential safety hazards exist in the good health of operators when a conventional air filling protection device is used for auxiliary welding of an AP1000 main steam pipeline, the AP1000 main steam pipeline welding method is disclosed. The welding method particularly includes the following several steps of S1, chamfering; S2, welding assembly; S3, weld preheating; S4, welded connection; and S5, postweld heat treatment. When the welding method is used for welding the AP1000 main steam pipeline, through adjustment matching of the groove dimensions and welding parameters, welded joints formed in the welding process can still achieve a continuous and uniform forming effect without the supporting action of backing gas, and therefore installation of the air filling protection device is omitted and the influence on the good health of the operators by protective gas is avoided.

Description

technical field [0001] The invention belongs to the technical field of AP1000 nuclear power, and in particular relates to a welding method of an AP1000 main steam pipeline. Background technique [0002] During the construction of the AP1000 nuclear power plant, a large number of pipe welding operations were involved. Among them, in the pipeline welding process, in order to avoid oxidation on the back side of the weld seam, it will affect the forming effect of the weld seam. Generally, before welding, the back side of the welding seam is inflated and protected by means of an inflatable protection device, such as argon gas protection. In this way, in the case of gas-filled protection, the back of the weld seam can be protected against oxidation during the welding process, and at the same time, the formation of the weld seam can be supported, so as to obtain a good weld seam formation effect. [0003] However, for the main steam pipeline of the AP1000 nuclear power plant, the...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/16B23K9/235
CPCB23K9/16B23K9/235
Inventor 王兴华盛世宝张百勤姜帆丁超丁军凯
Owner CHINA NUCLEAR IND FIFTH CONSTR CO LTD
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