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A carbon-controlled and toughened self-shielded open-arc high-boron surfacing flux-cored wire

A toughening and self-protection technology, applied in the direction of welding medium, welding equipment, welding/cutting medium/material, etc., can solve the problems of high brittleness, reduced service life, low impact toughness, etc., and achieve good economy and excellent Effect of wear resistance and high toughness

Inactive Publication Date: 2017-12-05
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The metamorphic eutectic has low impact toughness, is easy to crack, significantly increases the brittleness of high-boron alloys, and has a negative effect on the wear resistance of abrasive grains as a whole, which reduces its service life
Based on this, the current research and application of high-boron alloys are mainly low-carbon, and the medium and high-carbon types are rarely involved, mainly because they are too brittle. To obtain high-carbon high-boron alloys with practical value, it is necessary to overcome their excessive brittleness. shortcoming

Method used

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  • A carbon-controlled and toughened self-shielded open-arc high-boron surfacing flux-cored wire
  • A carbon-controlled and toughened self-shielded open-arc high-boron surfacing flux-cored wire
  • A carbon-controlled and toughened self-shielded open-arc high-boron surfacing flux-cored wire

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] During production, ferroboron, high-carbon ferrochrome, graphite and other alloy powders are weighed according to the composition ratio of the powder core, and all powders are passed through a 60-mesh sieve. The wear-resistant surfacing flux-cored wire was prepared and formed on the YHZ-1 flux-cored wire forming machine manufactured by Tianjin Sanying Welding Co., Ltd. The outer sheath of the wear-resistant surfacing flux-cored wire is H08A cold-rolled steel strip (width 16mm×thickness 0.36mm, the same below), and the sheath is equipped with graphite, metal and alloy powder to form a powder core. The composition of the powder core (weight percentage ) is: 40% of ferroboron, 40% of high carbon ferrochrome, 6% of ferrotitanium, 2.0% of flake graphite, 1.0% of superfine graphite, 3% of medium carbon ferromanganese, 4% of ferrosilicon, 4% of reduced iron powder, The powder core filling rate is 50%. The components of the powder core are stirred evenly and then rolled into Φ...

Embodiment 2

[0059] During production, ferroboron, graphite, high-carbon ferrochrome and alloy powders are weighed according to the composition ratio of the powder core, and all powders are passed through a 60-mesh sieve. The wear-resistant surfacing flux-cored wire was prepared and formed on the YHZ-1 flux-cored wire forming machine manufactured by Tianjin Sanying Welding Co., Ltd. The outer sheath of the wear-resistant surfacing flux-cored wire is H08A cold-rolled steel strip (16mm×0.36mm), and the sheath is equipped with graphite, metal and alloy powder to form a powder core. The composition (weight percentage) of the powder core is: boron iron 50%, high-carbon ferrochrome 30%, ferro-titanium 7.5%, flake graphite 3%, superfine graphite 0.5%, medium-carbon ferromanganese 5%, ferrosilicon 3%, reduced iron powder 1%, and the powder core is filled with The rate is 49%. The components of the powder core are stirred evenly and then rolled into Φ4.4 flux-cored welding wire, and the diameter i...

Embodiment 3

[0062] During production, weigh and weigh ferroboron, graphite, high-carbon ferrochrome and alloy powder according to the composition and ratio requirements of the powder core, and all the powders are passed through a 60-mesh sieve. The flux-cored wire was prepared and formed on the YHZ-1 flux-cored wire forming machine manufactured by Tianjin Sanying Welding Co., Ltd. The outer sheath of the flux-cored wire is H08A cold-rolled steel strip (16mm×0.36mm), and the sheath is equipped with graphite, metal and alloy powder to form a powder core. The composition (weight percentage) of the powder core is: boron iron 45%, high Carbon ferrochrome 35%, titanium iron 9%, flake graphite 2.5%, superfine graphite 0.5%, medium carbon ferromanganese 4%, ferrosilicon 3%, reduced iron powder 1%, the filling rate of the powder core is 51% . The components of the powder core are stirred evenly and then rolled into Φ4.4 flux-cored welding wire, and the diameter is reduced by 0.2mm each time, and ...

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Abstract

The invention discloses a carbon-controlling and toughening type self-shielded open-arc high-boron surfacing flux-cored wire. According to the technical scheme, a low-carbon-steel H08A cold-rolled thin steel strip is adopted as an outer sheath, and an alloy, graphite and other metal powder are mixed in the sheath to form a powder core, wherein the surfacing alloy is alloy powder obtained by adding high-content ferro-boron, high-carbon ferrochrome and ferrotitanium with different melting properties into the flux-cored wire; by virtue of open-arc surfacing current control, a high-boron surfacing melt with the alloy component in an incompletely-molten and unevenly-mixed state is formed, so that an alloy element phase structure is selectively optimized and configured; the powder core mainly consists of the following components: ferro-boron, high-carbon ferrochrome, ferrotitanium, graphite, medium-carbon ferromanganese, ferrosilicon and reduced iron powder. The carbon-controlling and toughening type self-shielded open-arc high-boron surfacing flux-cored wire overcomes the defect that a current high-boron surfacing alloy is great in brittleness due to microstructure characteristics of the high-boron surfacing alloy, can be widely applied to surfacing manufacturing or repairing of parts with abrasive wear resistance, for example, a concrete cement conveying tube, and is especially suitable for surfacing manufacturing or paring of the parts with low-stress abrasive wear resistance.

Description

technical field [0001] The invention relates to a high-carbon high-boron wear-resistant flux-cored welding wire used for surfacing manufacturing or repairing parts requiring low-stress abrasive wear resistance; in particular, it relates to a carbon-controlling toughening type self-protected open-arc high-boron stacking Flux cored wire. Background technique [0002] The wear resistance of surfacing alloys depends on factors such as the size, shape, distribution, quantity and even orientation of carbides contained in the alloy, while the toughness is related to factors such as the number and shape of the matrix and the shape of the hard phase. Large-sized primary carbide particles can effectively resist abrasive wear, and the in-situ precipitated second-phase hard phase particles are too small to lose their role as wear-resistant particles due to the loss of wear chips. Therefore, the preparation of surfacing alloys with a high volume fraction of wear-resistant main phase can...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/30
CPCB23K35/3053
Inventor 龚建勋刘江晴许继青
Owner XIANGTAN UNIV
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