Submerged arc stud welding method for embedded part of nuclear power plant

Abstract

The invention relates to a welding method, in particular to a submerged arc stud welding method for an embedded part of a nuclear power plant, and belongs to the technical field of nuclear power equipment. The welding method comprises the following steps that the embedded part of which is 16-32 mm in reinforcement diameter is welded with a matched welding flux by adopting a reasonable welding process, an embedded part steel plate is made of ordinary carbon steel or low alloy steel, and the parameters of the welding process are that the welding time is 4-12 s, the reinforcement extension elongation is 7-13 mm, the reinforcement lifting height is 6-12 mm, the current polarity is a direct current reverse polarity, and the current is 800-1,700 A; and the welding flux comprises the following components in percent by weight: 25-35 percent of SiO2 and TiO2, 25-35 percent of MnO and Al2O3, 20-30 percent of CaO and MgO, 5-15 percent of CaF2 and FeO, less then or equal to 0.03 percent of S, and less than or equal to 0.04 percent of P. Through adoption of the welding method, the problems of slag inclusion and magnetic blow in conventional submerged arc stud welding are solved, so that the welding efficiency of the embedded part is about 5 times of the conventional manual welding efficiency, the welding quality is high, and a great deal of labor cost is reduced.

Description

technical field [0001] The invention relates to a welding method, in particular to a submerged arc stud welding method for embedded parts of a nuclear power plant, and belongs to the technical field of nuclear power equipment. Background technique [0002] As a component embedded in concrete, the embedded parts of nuclear power plant provide important connection support for a large number of pipes, equipment, brackets, etc. in the nuclear island plant, and realize the function of firm connection between structural components and civil foundations. Embedded parts are mainly composed of steel plates and anchors welded on them. There are mainly two structural forms of embedded parts, namely embedded parts with anchor nails and embedded parts with anchoring steel bars. The traditional welding methods of embedded parts welding are mainly manual electrode welding and carbon dioxide gas shielded welding, but these welding methods have the following disadvantages: 1) The welding eff...

AI Technical Summary

Problems solved by technology

The traditional welding methods of embedded parts welding are mainly manual electrode welding and carbon dioxide gas shielded welding, but these welding methods have the following disadvantages: 1) The welding efficiency is low; 2) The pass rate of welding is low; 3) The weld surface The quality is poor, and the transition between weld beads is not smooth; 4) When welding multiple steel bars on one steel plate, the steel plate is easily deformed due to the large heat input, which needs to be corrected

The standard JBJ 18-2012 "Reinforcement Welding Acceptance Regulations" recommends the submerged arc stud welding welding process for embedded parts, but this welding process is only suitable for the welding of embedded parts in ordinary industrial and civil buildings, and welds are prone to occur during welding Problems such as internal slag inclusion and magnetic deflection, and the welding quality requirements of embedded parts in nuclear power plants are very strict to ensure the safety and reliability of objects connected with embedded parts

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