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Vacuum electron beam welding method and application of vacuum electron beam welding method to welding of hydroelectric steel

A technology of vacuum electron beam and welding method, which is applied in the direction of electron beam welding equipment, welding/welding/cutting items, welding equipment, etc., which can solve the problems of cleanliness, difficulty in guaranteeing vacuum degree, difficulty in welding seam cleaning, difficulty in welding seam forming, etc. problems, to achieve the effect of high welding difficulty, low production efficiency and fast welding speed

Inactive Publication Date: 2017-05-24
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For the current welding of large thickness steel billets, the traditional welding method needs to open a welding groove, the groove width is large, the weld seam is difficult to form, the welding deformation is large, the weld seam cleaning is difficult, the efficiency is low and the welding quality is poor, especially for two billets It is difficult to guarantee the cleanliness and vacuum of the room, which limits the application of traditional welding technology in the field of preparing large-thickness composite billets.
In addition, vacuum electron beam welding instantly melts and then solidifies quickly, and the cooling speed of the weld seam is very fast. The composition and hardenability of steel for hydropower (that is, the steel used in hydropower projects) determine that it is easy to obtain during rapid cooling. Hardened structure sensitive to cold cracks, easy to cause weld cracking during vacuum electron beam welding or rolling

Method used

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  • Vacuum electron beam welding method and application of vacuum electron beam welding method to welding of hydroelectric steel
  • Vacuum electron beam welding method and application of vacuum electron beam welding method to welding of hydroelectric steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] In this example, two 200mm×2200mm×4100mm (thickness×width×length) hydroelectric steel blanks were used to prepare 394±2mm×2200mm×4100mm (thickness×width×length) hydroelectric steel composite blanks by vacuum electron beam welding for use in Rolling produces extra-thick steel plates.

[0036] The chemical composition of the billet for hydroelectricity is by weight percentage: C 0.05%, Si 0.17%, Mn 1.11%, P0.0056%, S 0.0019%, Cr 0.41%, Mo 0.47%, Ni 0.14%, Cu 0.36%, V 0.026%, Nb 0.037%, Ti 0.019%, B 0.0027%, Als 0.21%, the balance is Fe and unavoidable impurities.

[0037] The vacuum electron beam welding process of the steel for hydroelectricity comprises the following steps:

[0038] (1) Surface treatment: place two blanks horizontally, and machine them with a large gantry milling machine to completely remove the iron oxide scale on the surface of the steel plate. Fresh metal is exposed on the surface of the steel plate after processing, and the surface roughness is 1.9...

Embodiment 2

[0047] In this example, two pieces of 300mm×2200mm×4000mm (thickness×width×length) hydroelectric steel blanks were used to prepare 593±3mm×2200mm×4000mm (thickness×width×length) hydroelectric steel composite blanks by vacuum electron beam welding for use in Rolling produces extra-thick steel plates.

[0048] The chemical composition of the steel billet for hydropower is by weight percentage: C 0.041%, Si 0.16%, Mn 1.01%, P0.0051%, S 0.0017%, Cr 0.37%, Mo 0.41%, Ni 0.12%, Cu 0.31%, V 0.024%, Nb 0.034%, Ti 0.017%, B 0.0021%, Als 0.19%, the balance is Fe and unavoidable impurities.

[0049] The vacuum electron beam welding process of the steel for hydroelectricity comprises the following steps:

[0050] (1) Surface treatment: Place two blanks horizontally and machine them with a large gantry milling machine to completely remove the iron oxide scale on the surface of the steel plate. Fresh metal is exposed on the surface of the processed steel plate with a surface roughness of 2....

Embodiment 3

[0059] In this example, two pieces of 400mm×1860mm×2600mm (thickness×width×length) hydroelectric steel blanks were used to prepare 791±3mm×1860mm×2600mm (thickness×width×length) hydroelectric steel composite blanks by vacuum electron beam welding for use in Rolling produces extra-thick steel plates.

[0060] The chemical composition of the billet for hydroelectricity is by weight percentage: C 0.031%, Si 0.14%, Mn 0.97%, P0.0043%, S 0.0016%, Cr 0.31%, Mo 0.37%, Ni 0.11%, Cu 0.29%, V 0.021%, Nb 0.031%, Ti 0.016%, B 0.0019%, Als 0.18%, the balance is Fe and unavoidable impurities.

[0061] The vacuum electron beam welding process of the steel for hydroelectricity comprises the following steps:

[0062] (1) Surface treatment: Place two blanks horizontally and machine them with a large gantry milling machine to completely remove the iron oxide scale on the surface of the steel plate. Fresh metal is exposed on the surface of the processed steel plate with a surface roughness of 2....

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Abstract

The invention discloses a vacuum electron beam welding method and the application of the vacuum electron beam welding method to welding of the hydroelectric steel. The vacuum electron beam welding method comprises the steps of surface treatment, combination, vacuum electron beam defocusing blowing, vacuum electron beam preheating welding, vacuum electron beam fusion welding, vacuum electron beam local heat treatment and vacuum-keeping slow cooling. The vacuum electron beam welding method aims to achieve vacuum electron beam welding of two pieces of hydroelectric steel, the welding efficiency is high, the welding performance is stable, the welding quality is excellent, the weld joint quality meets the GJB 1718-2005 I-level requirement, the strength coefficient of the welded joint is larger than or equal to 0.91, the requirement for welding of large-thickness hydroelectric steel billets can be completely met, and the vacuum electron beam welding method can be applied and popularized to welding of large-size components which are made of other materials, poor in welding performance, complicated in welding technology and large in workload.

Description

technical field [0001] The invention belongs to the technical field of welding, and in particular relates to a vacuum electron beam welding method and application of steel for hydroelectricity. Background technique [0002] Vacuum electron beam welding (EBW) has the advantage of high welding energy density (>10 6 W / cm 2 ), for any material, the weld seam can be melted quickly, and the welding speed is fast, and the heat-affected zone is small; the welding is carried out in a vacuum, which can prevent the material oxidation and other harmful gases from intruding; can obtain Large weld depth-to-width ratio, deep and narrow weld, so the deformation of the welded parts is small; the electron beam can be gathered very finely, and the deflection is convenient, so it can weld very fine parts. Electron beam welding is very suitable for special structures and particularly fine parts. Therefore, it has been widely used in aviation and aerospace industries since its birth. Aviat...

Claims

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Application Information

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IPC IPC(8): B23K15/06C22C38/02C22C38/04C22C38/44C22C38/42C22C38/46C22C38/48C22C38/50C22C38/54C22C38/06B23K103/04
CPCB23K15/06B23K15/0033B23K15/0053B23K2103/04C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/54
Inventor 肖丰强王东坡胡文彬邓彩艳邸新杰吴世品李一哲张彦燊
Owner TIANJIN UNIV
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