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A self-protected open arc high boron surfacing flux cored wire

A technology of flux-cored welding wire and self-protection, which is applied in the direction of welding equipment, welding medium, welding/cutting medium/material, etc., can solve the problems of low toughness of wear-resistant phase, reduced wear resistance of alloy, and excessive brittleness of alloy, etc., to achieve The effect of good toughness

Active Publication Date: 2019-06-21
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This causes a prominent problem in boron surfacing alloys: because of its main wear-resistant phase (Fe, Cr) 2 B can hardly dissolve into carbon atoms, which promotes the displacement of carbon atoms in the melt to the surrounding phase, forming a large amount of metamorphic and brittle eutectic α-Fe+Fe 3 (C,B) and cause the alloy to be too brittle
However, the toughness of the main wear-resistant phase is low, and its fracture and peeling reduce the wear resistance of the alloy.

Method used

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  • A self-protected open arc high boron surfacing flux cored wire
  • A self-protected open arc high boron surfacing flux cored wire
  • A self-protected open arc high boron surfacing flux cored wire

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] During production, weigh high-carbon ferrochrome, boron carbide, ferro-titanium, ferrosilicon, flake graphite, ultra-fine aluminum powder and reduced iron powder according to the powder core composition ratio of the above-mentioned flux-cored wire, among which, ultra-fine aluminum The powder is first passed through a 300-mesh sieve, and then other powder components of the drug core are passed through a 60-mesh sieve. Then mix all the powder components of the drug core evenly, then pour the mixed powder into a stainless steel container, spread it out so that the powder accumulation height does not exceed 15mm, put it into a drying oven and heat it up to 50-70°C and keep it warm for 2 hours .

[0036] The mixed powder is released from the furnace, and then it is pressed and formed on the YHZ-1 flux-cored wire forming machine. The outer sheath of the flux-cored wire is H08A cold-rolled steel strip (width 16mm×thickness 0.36mm, the same below), and the foreskin is equipped...

Embodiment 2

[0045] During operation, weigh high-carbon ferrochrome, boron carbide, ferro-titanium, ferrosilicon, flake graphite, ultra-fine aluminum powder and reduced iron powder according to the powder core composition ratio of the above-mentioned flux-cored wire, among which, ultra-fine aluminum The powder needs to pass through a 300-mesh sieve, and then the other powders of the drug core pass through a 60-mesh sieve. Mix all the powder components of the drug core evenly, then pour the mixed powder into a stainless steel container, spread it out so that the powder accumulation height does not exceed 15mm, put it into a drying furnace and raise the temperature to 50-70°C and keep it warm for 2 hours.

[0046] The mixed powder is released from the furnace, and then it is pressed and formed on the YHZ-1 flux-cored wire forming machine. The outer sheath of the flux-cored wire is H08A cold-rolled steel strip, and the powder core is composed of ferroalloy, boron carbide, flake graphite, ultr...

Embodiment 3

[0049] During operation, weigh high-carbon ferrochrome, boron carbide, ferrosilicon, ferrotitanium, flake graphite, superfine aluminum powder and reduced iron powder according to the powder core composition ratio of the above-mentioned flux cored wire, among which superfine aluminum The powder needs to pass through a 300-mesh sieve, and then the other powders of the drug core pass through a 60-mesh sieve. Mix all the powder components of the drug core evenly, then pour the mixed powder into a stainless steel container, spread it out so that the powder accumulation height does not exceed 15mm, put it into a drying furnace and raise the temperature to 50-70°C and keep it warm for 2 hours.

[0050] The mixed powder is released from the furnace, and then it is pressed and formed on the YHZ-1 flux-cored wire forming machine. The outer sheath of the flux-cored wire is H08A cold-rolled steel strip, and the powder core is composed of ferroalloy, boron carbide, flake graphite, ultra-fi...

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Abstract

The invention discloses a self-protection visible arc high-boron overlay welding flux-cored wire. The flux-cored wire is characterized in that an H08A cold-rolled thin steel band is taken as outer layer wrapping skin, high carbon ferrochrome, boron carbide, ferrotitanium, silicoferrite, crystalline flake graphite and superfine aluminum powder and reduced iron powder are blended in the wrapping skin to obtain a powder core, and after self-protection visible arc overlay welding is carried out, an organizational structure taking (Fe,Cr)23(C,B)6 as a main wear-proof phase and consisting of a largequantity of ferrites distributed along a cystiform grain boundary and a small quantity of isolated and dispersed (Fe,Cr)3(C,B) is formed. The flux-cored wire adopts a combined deoxygenation mode featured by initial-stage deoxygenation with superfine aluminum dust, middle-stage deoxygenation with ferrotitanium and later-stage deoxygenation with silicoferrite, so that formation of a cystiform (Fe,Cr)23(C,B)6 acting as the main wear-proof phase in an overlay welding alloy is facilitated, and the volume fraction of the cystiform (Fe,Cr)23(C,B)6 reaches above 90%. On a working condition that wear-proof particles with a certain impact load are abraded, the high-boron flux-cored wire can be used for a component self-protection visible arc overlay welding wear-resistant layer.

Description

technical field [0001] The invention belongs to the technical field of surfacing welding flux cored wire, in particular to a cellular M 23 (C,B) 6 It is a self-shielded open arc high boron surfacing flux cored wire with the structure of the wear-resistant phase as the main phase. Background technique [0002] As an economical wear-resistant material, boron alloy is mainly because the alloy is easy to precipitate a certain amount of Fe 2 Borides with high microhardness such as B (1100-1500HV) have good abrasive wear resistance and reduce the consumption of precious components such as W, Mo and Nb. In recent years, they have been paid attention to and applied in research. [0003] The preparation methods of boron alloys include: casting, surfacing welding and thermal expansion and infiltration. However, the boron content of the cast boron alloy is limited due to the large thermal influence, and the thermally expanded boron alloy layer is relatively thin. In comparison, the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/02B23K35/30
CPCB23K35/0266B23K35/308
Inventor 龚建勋姚惠文陈愚张明华
Owner XIANGTAN UNIV
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