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Pre-alloy powder type flux-cored welding wire and method for self-shielded open arc surfacing welding of high chromium alloys

A technology of alloy powder and flux-cored welding wire, applied in welding equipment, welding medium, welding equipment, etc., can solve the problems of peeling of surfacing layer, affecting the service life of wear-resistant workpiece, etc., so as to improve wear resistance and increase deposition efficiency. , the effect of reducing the residual stress of the weld

Active Publication Date: 2018-09-25
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although cracking can release part of the residual stress, these cracks are easy to expand under the periodic impact of the external load, causing large pieces of the surfacing layer to peel off, and even extending to the substrate to make it invalid, seriously affecting the service life of wear-resistant workpieces

Method used

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  • Pre-alloy powder type flux-cored welding wire and method for self-shielded open arc surfacing welding of high chromium alloys
  • Pre-alloy powder type flux-cored welding wire and method for self-shielded open arc surfacing welding of high chromium alloys
  • Pre-alloy powder type flux-cored welding wire and method for self-shielded open arc surfacing welding of high chromium alloys

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] Combined with the accompanying drawings, high-carbon ferrochromium, ferrosilicon, graphite, ferrovanadium and other alloy powders are weighed according to the composition ratio requirements of the flux-cored wire powder core during production, and all powders are passed through a 60-mesh sieve. The flux-cored welding wire is prepared and formed on the YHZ-1 flux-cored welding wire forming machine manufactured by a limited company. The outer sheath of the flux-cored wire is H08A cold-rolled steel strip (width 16mm×thickness 0.36mm, the same below), and the sheath is equipped with iron alloy, graphite, carbide and metal powder to form a powder core. The mass percentage of the powder core composition is: High-carbon ferrochrome 65%, ferrosilicon 9%, flake graphite 8%, ferro-vanadium 8%, medium-carbon ferromanganese 4%, ferromolybdenum 2%, TiC 2%, reduced iron powder 2%, the filling rate of the powder core 45%. The components of the powder core are stirred evenly and then ...

Embodiment 2

[0078]Combined with the accompanying drawings, high-carbon ferrochromium, ferrosilicon, graphite, ferrovanadium and other alloy powders are weighed according to the composition ratio requirements of the flux-cored wire powder core during production, and all powders are passed through a 60-mesh sieve. The flux-cored welding wire is prepared and formed on the YHZ-1 flux-cored welding wire forming machine manufactured by a limited company. The outer sheath of the flux-cored wire is H08A cold-rolled steel strip (16mm×0.36mm), and the sheath is equipped with iron alloy, graphite, carbide and metal powder to form a powder core. The composition (mass percentage) of the powder core is: high carbon 60% ferrochrome, 10% ferrosilicon, 7% flake graphite, 6% ferrovanadium, 3% medium carbon ferromanganese, 3% ferromolybdenum, 3% TiC, 8% reduced iron powder, the filling rate of the powder core is 47% %. The components of the powder core are stirred evenly and then rolled into Φ4.4 flux-core...

Embodiment 3

[0081] Combined with the accompanying drawings, during production, weigh and weigh high-carbon ferrochrome, ferrosilicon, graphite, ferrovanadium and other alloy powders according to the composition ratio requirements of the flux-cored wire powder core, and all the powders are passed through a 60-mesh sieve. The flux-cored welding wire is prepared and formed on the YHZ-1 flux-cored welding wire forming machine manufactured by a limited company. The outer sheath of the flux-cored wire is H08A cold-rolled steel strip (16mm×0.36mm), and the sheath is equipped with iron alloy, graphite, carbide and metal powder to form a powder core. The composition (mass percentage) of the powder core is: high carbon 63% ferrochrome, 8% ferrosilicon, 9% flake graphite, 7% ferrovanadium, 5% medium carbon ferromanganese, 3% ferromolybdenum, TiC 2%, reduced iron powder 3%, the filling rate of the powder core is 46 %. The components of the powder core are stirred evenly and then rolled into Φ4.4 flu...

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Abstract

The invention discloses a pre-prepared alloy powder type flux-cored wire and a self-protection open arc surfacing welding method of a high-chromium alloy. The adopted technical scheme lies in that a cold rolled thin steel strip manufactured through low-carbon steel H08A as an outer coating, high carbon ferro-chrome, ferrosilicon, graphite and other metal powder are blended inside the coating to form a powder core of the flux-cored wire, and high carbon ferro-chrome, ferroboron, ferrosilicon and reduced iron powder are blended to form pre-prepared alloy powder; and before welding, the alloy powder is placed on a welding bead in advance, the surfacing welding current control value is set, a regulating melt mode combined with the mass of the pre-prepared alloy powder type flux-cored wire is set, a nonhomogeneous melt containing liquid high carbon ferro-chrome atom clusters formed through melting high carbon ferro-chrome particles is formed, and the concretionary high-chromium alloy which adopts the liquid high carbon ferro-chrome atom clusters as component donors, nucleates and grows into primary M7C3 abrasion-resistance phases is formed. According to the method, the problems that the source of components of surfacing welding alloys is single and the chromium content of the surfacing welding alloys is not liable to increase are solved, and the method is widely applied to surfacing welding manufacturing and repairing of parts with the requirement of abrasive wear resistance.

Description

technical field [0001] The invention relates to a weld bead preset alloy powder type flux cored wire, in particular to a preset alloy powder type flux cored wire and a method for self-protected open arc surfacing welding of high chromium alloys. Background technique [0002] Flux cored wire submerged arc welding or open arc welding is an economical and reliable surfacing method, which usually deposits high chromium wear-resistant alloy on the substrate of low carbon steel or low alloy steel parts such as Q235A. However, affected by the dilution of base metal components such as Q235A, intergranular network or dendritic hypoeutectic structures are often formed at the bonding interface. The wear resistance of this type of structure is average, and the initiation cracks are easy to propagate along the network carbide, causing the high chromium surfacing alloy layer to break and form "flaking pits". Secondly, the powder coating rate of wear-resistant flux-cored wire is generally...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/30B23K35/368B23K9/04
CPCB23K9/04B23K35/0266B23K35/3086B23K35/3601B23K35/368
Inventor 龚建勋张立成刘江晴田兵
Owner XIANGTAN UNIV
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