Method for welding specially-thick high-strength bridge steel plate

A welding method and bridge technology are applied in the welding of low-alloy high-strength steel extra-thick plates, and the welding of extra-thick and high-strength bridge steel plates, which can solve the problems of difficult control of welding deformation of extra-thick plates, low welding efficiency, and easy occurrence of cold cracks. , to avoid reheat embrittlement, improve welding efficiency, and avoid reheat cracks

Inactive Publication Date: 2012-10-24
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a welding method for extra-thick and high-strength bridge steel plates, which solves welding defects such as cold cracks and reheat cracks that are prone to occur during the welding process of extra-thick and high-strength bridge steel plates, and the welding deformation of extra-thick plates is difficult to control, and the welding efficiency is low. And other issues

Method used

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  • Method for welding specially-thick high-strength bridge steel plate
  • Method for welding specially-thick high-strength bridge steel plate
  • Method for welding specially-thick high-strength bridge steel plate

Examples

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Effect test

Embodiment 1

[0025] Base material: 100mm thick Q370qE bridge steel plate produced by hot rolling + normalizing process, yield strength 380MPa, tensile strength 530MPa, elongation 32%, impact energy 263J at -40°C at 1 / 4 thickness, 1 / 2 thickness The impact energy at -40°C is 233J, the thickness combination of welded steel plates is 100mm+100mm, and the size of the test plate is 600mm×220mm×100mm. figure 1 shown;

[0026] Welding materials: gas shielded welding wire diameter Φ1.2mm, mechanical properties of cladding metal: yield strength 525MPa, tensile strength 595MPa, elongation 27%, impact energy at -40°C 76J; submerged arc welding wire diameter Φ5mm, mechanical properties of cladding metal It is: yield strength 450MPa, tensile strength 560MPa, elongation 30%, impact energy at -40°C 125J.

[0027] Welding process: Before welding, use mechanical treatment to clean the groove surface to remove oil and rust; preheat 150 ° C before welding, and control the interlayer temperature at 150 ~ 200 ...

Embodiment 2

[0030] Base material: 150mm thick Q370qE bridge steel plate produced by hot rolling + normalizing process, yield strength 375MPa, tensile strength 520MPa, elongation 30%, impact energy 227J at -40°C at 1 / 4 of the plate thickness, 1 / 2 plate thickness The impact energy at -40°C is 207J, the thickness combination of welded steel plates is 150mm+150mm, and the size of the test plate is 600mm×220mm×100mm. figure 2 shown;

[0031] Welding materials: gas shielded welding wire diameter Φ1.2mm, mechanical properties of cladding metal: yield strength 525MPa, tensile strength 595MPa, elongation 27%, impact energy at -40°C 76J; submerged arc welding wire diameter Φ5mm, mechanical properties of cladding metal It is: yield strength 450MPa, tensile strength 560MPa, elongation 30%, impact energy at -40°C 125J.

[0032] Welding process: Before welding, use mechanical treatment to clean the groove surface to remove oil and rust; preheat 150°C before welding, and control the interlayer tempera...

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Abstract

The invention provides a method for welding a specially-thick high-strength bridge steel plate and belongs to the technical field of specially-thick plate welding. The test plate of the method adopts a symmetric narrow gap U-shaped groove form, is combinedly welded by using two efficient welding methods, namely gas shielded welding for priming and bottom filling, and double-wire submerged arc welding for continuous filling and finishing, so as to achieve the purposes of reducing filling level and giving full play to the efficient double-wire submerged arc welding and high automation degree. The method has strong operability, greatly improves the welding efficiency of the specially-thick bridge steel plate, and significantly reduces manpower cost. Furthermore, by selecting a proper welding sequence, the method solves the problem that the welding deformation of the specially-thick steel plate is hard to control.

Description

technical field [0001] The invention belongs to the field of welding technology, and in particular provides a method for welding extra-thick high-strength bridge steel plates, which is efficient and low-cost, and the method is also suitable for welding other low-alloy high-strength steel extra-thick plates. Background technique [0002] With the development of steel structure technology, extra-thick steel plates are more and more widely used in large structural projects such as bridges. Components composed of high-strength extra-thick steel plates have been frequently used in large-span structures in recent years due to their large cross-section and high bearing capacity. At present, the demand for extra-thick and high-strength bridge steel plates of 100-150mm is increasing day by day, and the mechanical properties of domestic extra-thick bridge steel tend to be stable. No relevant reports have been seen. [0003] The following welding problems exist in the welding process...

Claims

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Application Information

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IPC IPC(8): B23K9/16B23K9/18B23K9/235B23K33/00
Inventor 张熹陈延清章军郭占山刘宏李战军许良红董现春鞠建斌张楠牟淑坤
Owner SHOUGANG CORPORATION
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