A silicon-toughened high-chromium cast iron type self-shielding flux-cored welding wire and its preparation method

A technology of high-chromium cast iron and flux-cored wire, which is applied in welding equipment, welding media, manufacturing tools, etc., can solve the problems that the wear resistance cannot be guaranteed, and the hardness of the surfacing alloy decreases, so as to achieve good welding performance and good welding performance. Road surface forming, good toughness effect

Active Publication Date: 2018-07-27
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The method of reducing the content of C and alloying elements is usually used to transform the high-chromium cast iron type surfacing alloy from hypereutectic structure to hypoeutectic structure in order to obtain sufficient toughness; however, reducing the content of C and alloying elements will lead to The hardness is obviously reduced, and the wear resistance cannot be guaranteed

Method used

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  • A silicon-toughened high-chromium cast iron type self-shielding flux-cored welding wire and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0029] A silicon-toughened high-chromium cast iron type self-shielding flux-cored welding wire, comprising a low-carbon steel strip and a flux core, the flux core is filled in the steel strip, and the composition of the flux core is prepared according to the following quality: 75g of 80-mesh high-carbon ferrochrome, 12g of 80-mesh ferrosilicon, 0.5g of 60-mesh graphite, 1g of 200-mesh graphite, 1g of 60-mesh ferroboron, 2g of 200-mesh ferroboron, 1g of 60-mesh aluminum-magnesium alloy, 1g of 200-mesh aluminum-magnesium alloy, 1.5g of 60 mesh manganese powder, 1g of 200 mesh manganese powder, 4g of 80 mesh iron powder. The various powders taken are put into the powder mixer, mixed for 40 minutes, and then the mixed powder is added into the U-shaped 21×0.5mm H08A carbon steel belt groove, and the filling rate is 52%. Then close the U-shaped groove so that the powder is wrapped therein. Then make it pass through one or more of the wire drawing dies with diameters of 4.2mm, 3.8mm...

Embodiment 2

[0031]A silicon-toughened high-chromium cast iron type self-shielding flux-cored welding wire, comprising a low-carbon steel strip and a flux core, the flux core is filled in the steel strip, and the composition of the flux core is prepared according to the following quality: 60g of 80-mesh high-carbon ferrochrome, 16g of 80-mesh ferrosilicon, 1g of 60-mesh graphite, 1.5g of 200-mesh graphite, 5g of 60-mesh ferroboron, 3g of 200-mesh ferroboron, 2g of 60-mesh aluminum-magnesium alloy, 1.5g of 200-mesh aluminum-magnesium alloy , 2g of 60 mesh manganese powder, 1.5g of 200 mesh manganese powder, 6.5g of 80 mesh iron powder. The various powders taken are put into the powder mixer, mixed for 40 minutes, and then the mixed powder is added into the U-shaped 21×0.5mm H08A carbon steel belt groove, and the filling rate is 56%. Then close the U-shaped groove so that the powder is wrapped therein. Then make it pass through one or more of the wire drawing dies with diameters of 4.2mm, 3...

Embodiment 3

[0033] A silicon-toughened high-chromium cast iron type self-shielding flux-cored welding wire, comprising a low-carbon steel strip and a flux core, the flux core is filled in the steel strip, and the composition of the flux core is prepared according to the following quality: 65g of 80-mesh high-carbon ferrochrome, 15g of 80-mesh ferrosilicon, 0.6g of 60-mesh graphite, 2g of 200-mesh graphite, 3g of 60-mesh ferroboron, 1.5g of 200-mesh ferroboron, 1.2g of 60-mesh aluminum-magnesium alloy, 1.8g of 200-mesh aluminum Magnesium alloy, 1.6g of 60 mesh manganese powder, 3g of 200 mesh manganese powder, 5.3g of 80 mesh iron powder. The various powders taken are put into the powder mixer, mixed for 40 minutes, and then the mixed powder is added into the U-shaped 21×0.5mm H08A carbon steel belt groove, and the filling rate is 55%. Then close the U-shaped groove so that the powder is wrapped therein. Then make it pass through one or more of the wire drawing dies with diameters of 4.2m...

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Abstract

The invention discloses a silicon annealed high-chromium cast iron type self-protection flux-cored wire. A mild-carbon steel strip serves as the skin. A flux core is composed of, by mass, 60-75% of 80-mesh high-carbon ferro-chrome, 12-16% of 80-mesh silicon iron, 0.5-1% of 60-mesh graphite, 1-2% of 200-mesh graphite, 1-5% of 60-mesh ferro-boron, 1-3% of 200-mesh ferro-boron, 1-2% of 60-mesh aluminum magnesium alloy, 1-2% of 200-mesh aluminum magnesium alloy, 1-2% of 60-mesh manganese powder, 1-3% of 200-mesh manganese powder, and the balance 80-mesh iron powder. According to the wire provided by the invention, excellent welding technological performance is guaranteed by adding flux core components with different particle sizes; a proper amount of Si is added into the flux core, (Cr,Fe)7C3 carbide in the surfacing alloy high-chromium cast iron type hypereutectic structures is refined, the Fe3Si phase is formed, the toughness of a surfacing layer is remarkably improved, and the abrasion resistance is good; and in addition, the welding technological performance is excellent, the melting efficiency is high, slag removal is not needed during multilayer welding, and the manufacturing cost of the wire is low.

Description

technical field [0001] The invention belongs to the field of welding in material processing engineering, and in particular relates to a silicon-toughened high-chromium cast iron type self-protecting flux-cored welding wire and a preparation method thereof. Background technique [0002] As a green manufacturing process, surfacing welding is widely used in the repair or remanufacture of various wear-resistant parts. Due to low cost and easy preparation, M 7 C 3 Type carbides (M=Cr, Fe) are widely used as high-chromium cast iron surfacing alloys with wear-resistant skeletons. Coarse M in hypereutectic structure of high chromium cast iron surfacing alloy 7 C 3 Type carbide, on the one hand, is beneficial to improve wear resistance, on the other hand, it is prone to metallurgical defects and microcracks, and is very brittle, which becomes an important reason why surfacing alloys develop into macrocracks or even cracks during service. . Therefore, overcoming the defects of p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/02B23K35/30B23K35/368B23K35/40
CPCB23K35/0266B23K35/3053B23K35/368B23K35/406
Inventor 刘大双魏萍卢聪
Owner JIANGSU UNIV OF SCI & TECH
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