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Build-up welding rod for repairing Cr3 roller and build-up welding method

A technology for surfacing welding electrodes and rolls, which is applied in the direction of keeping the roll equipment in an effective state, welding medium, and metal rolling. It can solve the problems of low connection strength and poor tempering stability, and achieve good crack resistance, hardness and plasticity. High, good tempering stability

Inactive Publication Date: 2010-03-03
WUHAN TEMO WELDING CONSUMABLES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The second object of the present invention is to overcome the defects and deficiencies of the existing surfacing welding method, such as the low connection strength between the surfacing metal and the roll material, and poor tempering stability, and provide a surfacing welding method using Cr3 series roll repair welding electrodes

Method used

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  • Build-up welding rod for repairing Cr3 roller and build-up welding method
  • Build-up welding rod for repairing Cr3 roller and build-up welding method

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Effect test

Embodiment 1

[0032] A Cr3 series roll repair welding rod, including a welding core and a coating, the welding core is H08A steel, the diameter of the welding core is 3.2 mm, and the mass % components of the welding rod coating are: marble 39, fluorite 23, Low carbon ferromanganese 2.5, molybdenum ferro 2.5, high carbon ferrochrome 15, soda ash 1, rare earth alloy 2.5, titanium dioxide 6, graphite 1, ferrosilicon 45, silicon dioxide 5.5.

[0033] The process of welding and repairing the Cr3 roll by adopting the surfacing electrode in the present embodiment is as follows:

[0034] A. Pretreatment of roll defects: Grinding the cracks and defects of the roll and forming grooves on the surface of the roll;

[0035] B. Preheat treatment: Heat the roll to 350°C in a heat treatment furnace, wrap the roll surface with asbestos after it comes out of the furnace, and expose the cracks and defects on the pretreated part, that is, the polished cracks, and polish the oxide skin on the surface of the def...

Embodiment 2

[0038] A Cr3 series roll repair welding rod, including a welding core and a coating, the welding core is H08A steel, the diameter of the welding core is 4 mm, and the mass % components of the welding rod coating are: marble 36, fluorite 20, Low carbon ferromanganese 1.5, molybdenum ferro 1, high carbon ferrochrome 13, soda ash 0, rare earth alloy 1, titanium dioxide 4, graphite 0.5, ferrosilicon 45 3, silicon dioxide 4.

[0039] The process of welding and repairing the Cr3 roll by adopting the surfacing electrode in the present embodiment is as follows:

[0040] A. Pretreatment of roll defects: Grinding the cracks and defects of the roll and forming grooves on the surface of the roll;

[0041] B. Preheat treatment: heat the roll to 380°C in a heat treatment furnace, wrap the roll surface with asbestos after it comes out of the furnace, and expose the cracks and defects on the pretreated part, that is, the polished cracks, and polish the oxide skin on the surface of the defect ...

Embodiment 3

[0044] A Cr3 series roll repair welding rod, including a welding core and a coating, the welding core is H08A steel, the diameter of the welding core is 5 mm, and the mass % components of the welding rod coating are: marble 42, fluorite 26, 4 low-carbon ferromanganese, 4 ferromolybdenum, 17 high-carbon ferrochromium, 1.5 soda ash, 4 rare earth alloys, 8 titanium dioxide, 1.5 graphite, 5 ferrosilicon 45, and 7 silicon dioxide.

[0045] The process of welding and repairing the Cr3 roll by adopting the surfacing electrode in the present embodiment is as follows:

[0046] A. Pretreatment of roll defects: Grinding the cracks and defects of the roll and forming grooves on the surface of the roll;

[0047] B. Preheat treatment: Heat the roll to 330°C in a heat treatment furnace, wrap the roll surface with asbestos after it comes out of the furnace, and expose the cracks and defects on the pretreated part, that is, the polished cracks, and polish the oxide skin on the surface of the d...

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Abstract

The invention relates to a build-up welding rod for repairing a Cr3 roller and a build-up welding method, which belong to the technical field of welding materials and welding. The build-up welding rodcomprises a welding core and a coating, the welding core is H08A steel and the coating of the welding rod comprises, by mass percent, 36 to 42 marble, 20 to 26 fluorite, 1.5 to 4 low-carbon ferromanganese, 1 to 4 ferromolybdenum, 13 to 17 high carbon ferro-chrome, 0 to 1.5 calcined soda, 1 to 4 rare earth alloy, 4 to 8 titanium dioxide, 0.5 to 1.5 graphite, 3 to 5 No,45 silicoferrite and 4 to 7 silicon dioxide. The build-up metal has no crack, good crack resistance, good wear resistance, high hardness and plasticity and good tempering stability. The welding method is simple and convenient, and the connection of the melt-applying metal and the roller is firm to excellently satisfy the repairing requirement of the Cr3 support roller.

Description

technical field [0001] The invention relates to an electrode and a welding method, in particular to a surfacing electrode for repairing Cr3 series rolls and a surfacing welding method for repairing Cr3 series rolls using the electrode. It belongs to the field of welding materials and welding technology. Background technique [0002] Rolls are one of the important parts in steel rolling production. Each rolling mill consumes a large amount of rolls every year. Due to the large consumption, the rolls are expensive, and more and more technicians and spare parts management departments pay more and more attention to them. If the working layer is surfacing with wear-resistant materials or the scrapped rolls are repaired with wear-resistant materials to improve the service life of the rolls or reuse the scrapped rolls, the economic and social benefits are very significant. And the composite roll repaired by the surfacing method is not only low in cost, but also can increase the se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/362B23K9/04B23K9/235B23K9/095B21B28/02
Inventor 刘玉双陈冰泉吕奎清
Owner WUHAN TEMO WELDING CONSUMABLES CO LTD
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