Method for welding main steam or main water supply pipeline of nuclear island in nuclear power plant

Abstract

The invention belongs to the technical field of welding, and provides a method for welding a main steam or main water supply pipeline of a nuclear island in a nuclear power plant in order to solve the problems that an existing method for the main steam or main water supply pipeline of the nuclear island is low in efficiency and large in labor intensity, and a welder is likely to be wounded. The method comprises the steps that 1, groove machining is carried out on the main steam or main water supply pipeline of the nuclear island, a machined groove is a U-shaped groove, the groove angle of the groove ranges from 5 degrees to 8 degrees, the length of the truncated edge of the groove ranges from 1.8 mm to 3 mm, the thickness of the truncated edge ranges from 1.8 mm to 3 mm, and the radius of a chamfer ranges from 1.8 mm to 3 mm; 2, pipeline assembly is carried out; 3, tack bar spot welding fixing is carried out through manual argon tungsten-arc welding; 4, pipeline preheating is carried out; 5, bottoming, filling and cover face welding are completed through automatic argon tungsten-arc welding; and 6, post thermal treatment and stress relief thermal treatment are carried out. According to the method for welding the main steam or main water supply pipeline, the working efficiency of welding the main steam or main water supply pipeline of the nuclear island is improved, welding material consumption is reduced, the working environment of the welder is improved, and the labor intensity of the welder is lowered.

Description

technical field [0001] The invention belongs to the technical field of welding, and in particular relates to a welding method for a main steam or main water supply pipeline of a nuclear island of a nuclear power plant. Background technique [0002] The main steam pipeline of the nuclear island of the nuclear power plant is used to transport steam from the nuclear island to the conventional island, and then supplied to the main steam turbine and other steam-consuming equipment and systems. The main water supply pipeline of the nuclear island is used to transport water to the evaporator to generate steam. The main steam and main water supply pipes of the island are all heat-resistant steel, with the characteristics of thick pipe diameter and wall thickness, and the pipe wall thickness is usually 20-54mm. During the construction of the nuclear power plant, the main steam and main water supply pipelines of the nuclear island are welded by several pipes. Due to the special operat...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems of low efficiency, high labor intensity and easy injury of welders in the current welding method of the main steam or main water supply pipeline of the nuclear island, the present invention proposes a welding method for the main steam or main water supply pipeline of the nuclear island of the nuclear power plant to reduce the labor of the welder Strength, reduce the welder's operation risk, improve the efficiency of welding operation

Images