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Submerged-arc welding method of high-intensity steel thick plate for nuclear power

A welding method and submerged arc welding technology, applied in the direction of arc welding equipment, welding medium, welding equipment, etc., to achieve the effects of high impact energy, excellent low-temperature impact toughness and crack resistance, high impact toughness reserve and safety margin

Inactive Publication Date: 2013-10-09
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the invention is to propose a solution to the welding tensile strength R m Welding process method without preheating before welding and without heat treatment after welding for submerged arc welding butt joints of thick steel plates for ≥585MPa nuclear power (AP1000) pressure equipment

Method used

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  • Submerged-arc welding method of high-intensity steel thick plate for nuclear power

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Base material: -50℃ nuclear power steel with tensile strength of Rm620MPa and yield strength Rel of 520MPa, the thickness of the steel plate is 36mm+36mm; Symmetrical U-shaped groove, groove angle is 60°, blunt edge 6mm, R6mm;

[0022] Welding material matching: WGX1 welding wire, wire diameter Ф4.0mm, flux is CHF105, mechanical properties of deposited metal are R el =560MPa, R m =650 MPa, A=24%, Z=66%, impact energy -50℃KV 2 =117J.

[0023] Butt joint welding is carried out, the welding current is 700~695A, the welding voltage is 33V, the welding speed is 45~42cm / min, and the welding line energy is 31~32kJ / cm; The temperature is controlled at 160~165℃, no preheating before welding and no heat treatment after welding.

[0024] After testing, the mechanical properties of the welded high-strength nuclear power steel thick plate butt joint are as follows: the tensile strength of the weld is R m =665MPa, joint cold bending (side bending) d=3a, 180° qualified, weld imp...

Embodiment 2

[0026] Base material: -50℃ nuclear power steel with tensile strength of Rm645MPa and yield strength Rel of 550MPa, the thickness combination of the steel plate is 48mm+48mm; the size of the test plate is 600mm×400mm×48mm;

[0027] The submerged arc welding groove adopts a double-sided symmetrical U-shaped groove, the groove angle is 60°, and the blunt edge is 6mm and R6mm;

[0028] Welding material matching: WGX1 welding wire, wire diameter Ф4.0mm; flux is CHF105, mechanical properties of deposited metal are R el =560MPa, R m =650 MPa, A=24%, Z=66%, impact energy -50℃KV 2 =117J;

[0029] For butt joint welding, the welding current is 680~670A, the welding voltage is 33V, the welding speed is 41~39cm / min, and the welding line energy is 32~33J / cm. At 170~180(℃), no preheating before welding and no heat treatment after welding.

[0030] After testing, the mechanical properties of the butt joints of the welded high-strength nuclear power steel thick plates, the tensile strengt...

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Abstract

The invention relates to a submerged-arc welding method of a high-intensity steel thick plate for nuclear power. The submerged-arc welding method of the high-intensity steel thick plate for nuclear power includes the following steps that high-intensity steel is utilized, the Rm of the high-intensity steel is no less than 645Mpa, the ReL of the high-intensity steel is no less than 535Mpa, the ductility A of the high-intensity steel ranges from 20% to 40% and the -45oCKV2 ballistic work of the high-intensity steel is larger than 54J. Two plates with the same width ranging from 36mm to 48mm are combined and connected in an abutted mode. A matched welding stick has the tensile strength of more than 600MPa and the diameter of 4mm. U-shaped submerged-arc welding grooves are symmetric, the angles of the grooves are 60 degrees and the truncated edges are 6mm long. Under the condition that currents are 650A to 700A, the voltage is 33V to 31V, the rate is 45cm per minute to 35 cm per minute and linear energy is 31kJ per cm to 35kJ per cm, continuous welding is performed. The submerged-arc welding method of the high-intensity steel thick plate for nuclear power solves the problems that when steel thick plates with the tensile strength of no less than 585Mpa for a nuclear power (AP1000) pressure bearing device is welded, a submerged-arc welding butt joint is not pre-heated before welding and does not undergo heat treatment after welding in an existing welding technology method, the tensile strength and joint ballistic work of the submerged-arc welding joint reach high levels and the joint has high impact toughness reserve and high safety margin.

Description

technical field [0001] The invention relates to a submerged arc welding process, in particular to a submerged arc welding method for high-strength nuclear power steel thick plates. [0002] It is suitable for tensile strength R m Submerged arc welding of steel thick plate butt joints for third-generation nuclear power plants (AP1000) with a level of ≥585MPa. Background technique [0003] With the rapid development of my country's nuclear power energy demand, the steel used for nuclear power pressure equipment has its particularity in the use environment. It has to withstand the extremely strong irradiation of the reactor core. The last line of protection on the island is of great significance to the safety of the nuclear island. With the development of steel for nuclear power pressure equipment, its comprehensive mechanical properties, especially low temperature impact toughness have been greatly improved. The improvement of the performance of the base material puts forwar...

Claims

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Application Information

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IPC IPC(8): B23K9/18B23K33/00B23K35/30
Inventor 胡因洪缪凯牟文广黄治军李立军许颖袁桂莲刘文艳王靓胡家国
Owner 武汉钢铁有限公司
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