CN106041361B - The method of preset alloy powder type flux-cored wire and its self-shield open arc built-up welding high-chromium alloy - Google Patents

The method of preset alloy powder type flux-cored wire and its self-shield open arc built-up welding high-chromium alloy Download PDF

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CN106041361B
CN106041361B CN201610628017.0A CN201610628017A CN106041361B CN 106041361 B CN106041361 B CN 106041361B CN 201610628017 A CN201610628017 A CN 201610628017A CN 106041361 B CN106041361 B CN 106041361B
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cored wire
flux
welding
powder
preset
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CN106041361A (en
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龚建勋
张立成
刘江晴
田兵
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Xiangtan University
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/24Selection of soldering or welding materials proper
    • B23K35/30Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
    • B23K35/3053Fe as the principal constituent
    • B23K35/308Fe as the principal constituent with Cr as next major constituent
    • B23K35/3086Fe as the principal constituent with Cr as next major constituent containing Ni or Mn
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/02Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
    • B23K35/0255Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in welding
    • B23K35/0261Rods, electrodes, wires
    • B23K35/0266Rods, electrodes, wires flux-cored
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/36Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
    • B23K35/3601Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest with inorganic compounds as principal constituents
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/36Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
    • B23K35/368Selection of non-metallic compositions of core materials either alone or conjoint with selection of soldering or welding materials
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00Arc welding or cutting
    • B23K9/04Welding for other purposes than joining, e.g. built-up welding

Abstract

A kind of method of preset alloy powder type flux-cored wire and its self-shield open arc built-up welding high-chromium alloy; including using using mild steel H08A cold rollings thin steel strip as outer layer foreskin; it is equipped with high carbon ferro-chrome, ferrosilicon, graphite and other metal powders in foreskin and constitutes flux-cored wire powder core, is also equipped with and preset alloy powder is formed by high carbon ferro-chrome, ferro-boron, ferrosilicon, reduced iron powder;Before weldering, first alloy powder is preset on welding bead, it is equipped with welding current controlling value simultaneously, the regulation and control melt pattern being combined with preset alloy powder type flux-cored wire quality is set, the heterogeneous melt for forming liquid high carbon and chromium elementide comprising high carbon ferro-chrome particles fuse is formed it into, is realized using liquid high carbon and chromium elementide as ingredient donor and the greatly nascent M of forming core length7C3The technical solution of the high-chromium alloy of wear-resisting phase solidification;It has solved the unification of hardfacing alloy ingredient origin fast and the chromium content of hardfacing alloy is not easy the problem improved;The present invention is widely used in surfacing manufacturing and the reparation of requirement abrasive wear resistance parts.

Description

Preset alloy powder type flux-cored wire and its self-shield open arc built-up welding high-chromium alloy Method
Technical field
The present invention relates to a kind of preset alloy powder type flux-cored wire of welding bead, more particularly to a kind of preset alloy powder type medicine The method of core welding wire and its self-shield open arc built-up welding high-chromium alloy.
Background technology
Flux-cored wire submerged-arc welding or open arc welding are as a kind of cheap and reliable overlaying method, typically in Q235A etc. Deposition high-chromium wear-resistant alloy on mild steel or low-alloy steel part base solid.But influenced by the base material compositions dilution such as Q235A, it ties Interface multiform is closed at along crystal mesh shape or dendritic hypoeutectic structure.The class loading wearability is general, and crack initiation is easily along net Shape carbide extends, and causes high chromium hardfacing alloy layer fragmentation and forms " peeling off hole ".Secondly, wear-resisting welding wire with flux core packet powder rate is general It is 43%~52%, wraps up crust steel band specification and ingredient is fixed, and in order to meet molding and its heap welder of flux-cored wire Appropriate other components need to be added in skill performance requirement, cause hardfacing alloy chromium content to be limited in 18%Cr hereinafter, abnormal eutectic (iron Ferritic+carbonization three (iron, chromium))/[α-Fe+ (Fe, Cr)3C] quantity is more and to be allowed to brittleness larger.
Nascent M7C3Mutually be high-chromium alloy the wear-resisting phase of master, M include Fe, the elements such as Cr, generally by homogeneous melt through energy The effects that volt, undulating composition and rise and fall of structure, forming core was grown up, this needs high carbon component addition.Hardfacing alloy carbon component Source has:Graphite, copmbined-carbon and the ferroalloy for being dissolved carbon, wherein graphite is the pass for making flux-cored wire have good drawing property Key component, but also lead to built-up welding melt carbon atom distribution excessively disperse and lead to brittleness metamorphosis eutectic [α-Fe+ (Fe, Cr)3C] It is more.
In order to improve deposition efficiency, when flux-cored wire self-shield open arc welding, is carried out using the current value of 500~600A or more Built-up welding operation, burning loss of alloy amount is big and keeps oxidation residua more.Since workpiece postwelding is generally handled without stress relief annealing, cause Keep weld seam residual thermal stress big, crackle is more.Although cracking releasable portion residual stress, these crackles are in plus load It easily extends under periodic shock effect and overlay cladding bulk is caused to peel off, even extend to matrix and be allowed to fail, serious shadow Ring the service life of wear-resisting workpiece.
Invention content
For the above situation, the purpose of the present invention is to provide a kind of existing superior abrasion resistances, and have higher deposition efficiency With the preset alloy powder type flux-cored wire of higher toughness.
To achieve the above object, a kind of preset alloy powder type flux-cored wire, including flux-cored wire powder core and preset alloy The mass percentage of powder, component is respectively:
Flux-cored wire powder core
Preset alloy powder
In order to advanced optimize technique effect, more excellent group of flux-cored wire powder core and preset alloy powder becomes:
Flux-cored wire powder core
Preset alloy powder
In order to advanced optimize technique effect, more excellent group of flux-cored wire powder core and preset alloy powder becomes:
Flux-cored wire powder core
Preset alloy powder
In order to advanced optimize technique effect, more excellent group of flux-cored wire powder core and preset alloy powder becomes:
Flux-cored wire powder core
Preset alloy powder
Increase chromium content using various ways another object of the present invention is to providing a kind of and promotes the preferential of wear-resisting phase It is formed, reaches the quantity for substantially reducing brittleness metamorphosis eutectic, and then reduce weld seam thermal deformation and residual stress;It can obtain more excellent comprehensive The method for closing the abrasive wear resistance self-shield open arc built-up welding high-chromium alloy of performance.
To achieve the above object, a kind of method of self-shield open arc built-up welding high-chromium alloy, it is first that alloy powder is preset before weldering In on welding bead, while it being equipped with welding current controlling value, and the tune being combined with preset alloy powder type flux-cored wire quality is set Melt pattern is controlled, the heterogeneous melt for forming liquid high carbon and chromium elementide comprising high carbon ferro-chrome particles fuse is formed it into, Realize the directly greatly nascent M of forming core length using liquid high carbon and chromium elementide as ingredient donor7C3The high chromium of wear-resisting phase solidification closes Gold.
It is 6 that in order to advanced optimize technique effect, in open arc self-shield built-up welding, mass percent, which is added, in flux for flux-cored wire Mass percent is added in the vanadium iron of~8% vanadium content 50%, the molybdenum-iron component of 2~3% amounts containing molybdenum 50% and preset alloy powder The ferrosilicon of no less than 24% silicon content 40~47%.
In order to advanced optimize technique effect, open arc self protection pile-up welding flux core welding wire flux-cored wire is added mass percent and is 2~3% TiC particles.
In order to advanced optimize technique effect, flux for flux-cored wire component and preset alloy powder all cross 60 mesh sieve.
In order to advanced optimize technique effect, welding current controlling value is:440~460A.
In order to advanced optimize technique effect, when built-up welding unit length weld seam, preset alloy powder quality is needed for built-up welding The 40%~60% of flux-cored wire quality.
A kind of method of preset alloy powder type flux-cored wire and its self-shield open arc built-up welding high-chromium alloy, including use with Mild steel H08A cold rolling thin steel strips are outer layer foreskin, in being equipped with high carbon ferro-chrome, ferrosilicon, graphite and other metal powder groups in foreskin Divide and constitute flux-cored wire powder core, is also equipped with and preset alloy powder is grouped as by high carbon ferro-chrome, ferro-boron, ferrosilicon, reduced iron powder group;Weldering Before, first alloy powder is preset on welding bead, while being equipped with welding current controlling value, and be arranged and preset alloy powder type medicine core The regulation and control melt pattern that Quality of Final Welding Wire is combined forms it into and forms liquid high carbon and chromium atom comprising high carbon ferro-chrome particles fuse The heterogeneous melt of cluster realizes the directly greatly nascent M of forming core length using liquid high carbon and chromium elementide as ingredient donor7C3 The technical solution of the high-chromium alloy of wear-resisting phase solidification;Existing flux-cored wire submerged-arc welding and open arc welding etc. is overcome to be obtained with traditional approach It takes with the M that comes into being7C3It is mutually the wear-resisting phase of master of high-chromium alloy, and because of excessively carbon atom of the Dispersed precipitate in built-up welding melt, initiation Brittleness metamorphosis eutectic [α-Fe+ (Fe, Cr)3C] increase, and then lead to high chromium hardfacing alloy layer fragmentation and form " peeling off hole " etc. and lacks It falls into;It has solved the unification of hardfacing alloy ingredient origin fast and the chromium content of hardfacing alloy is not easy the problem improved.
The present invention provides a kind of completely new slave homogeneous high chrome melts to obtain the M that comes into being7C3The method of wear-resisting phase, greatly changes The wearability of alloy has been apt to it, has improved deposition efficiency, reduced weld residual stress, has especially been the increase in preset alloyed powder before weldering The introducing mechanism at end realizes hardfacing alloy ingredient origin diversification, improves the comprehensive performance of high-chromium alloy overlaying, pole comprehensively Tool popularizes application prospect;It can be widely used in the surfacing manufacturing for requiring abrasive wear resistance parts and reparation, as cement is vertical Grinding roller etc..
Compared with prior art, the invention has the advantages that:
(I) built-up welding deposition efficiency is different:Unit length weld seam is welded, it is preset to be equivalent to required flux-cored wire hardfacing alloy matter Amount 40%~60% alloying powder, can with welding energy consume it is not increased under the conditions of built-up welding deposition efficiency is improved 36%~55%, there are significant energy conservation and consumption reduction effects, and weld seam thermal deformation and residual stress is made to be obviously reduced.
(II) hardfacing alloy ingredient origin is different:Gao Ge is supplied using flux-cored wire and preset alloy powder two ways Ingredient needed for hardfacing alloy increases hardfacing alloy chromium content.
(III) comes into being M7C3Phase precipitation mode is different:It is equivalent to required flux-cored wire hardfacing alloy quality by the way that welding bead is preset 40%~60% alloying powder, form high chromium ferrochrome particles fuse form liquid high carbon and chromium elementide, directly with The elementide greatly nascent M of forming core length for ingredient donor7C3Phase, rather than by homogeneous melt through undulating composition, fluctuation of energy And the effects that rise and fall of structure, is formed, and nucleation barrier is reduced, and promotes the M that comes into being7C3Wear-resisting preferentially forming for phase and significantly reduce brittleness Abnormal eutectic ((α-Fe+M3(C, B)) quantity.
Tissue morphology at (IV) hardfacing alloy combination interface is different:Preset alloy powder reduces the component diluent of base material Effect forms the nascent M of a large amount of graininess7C3Wear-resisting phase avoids the calmodulin binding domain CaM from forming the brittleness such as hypoeutectic and eutectic and wear-resisting type Poor tissue.
The macrohardness of (V) fore-put powder type flux-cored wire built-up welding high-chromium alloy reaches 59~61HRC, abrasive wear resistance Performance is substantially better than same flux-cored wire hardfacing alloy;The open arc built-up welding does not crack for two layers, has higher toughness.
(VI) high-chromium wear-resistant alloy manufacturing cost is low, and method is easy, and preset alloy powder built-up welding, which is equivalent to reduce, to be equal The welding job amount of quality flux-cored wire, and material, manufacturing cost are substantially reduced by comparison.
The present invention is widely used in surfacing manufacturing and the reparation of requirement abrasive wear resistance parts;Particularly suitable for wear-resisting The grain higher parts of wear requirements, the surfacing manufacturing such as cement vertical grinding roller and reparation.
Invention is further described in detail with reference to the accompanying drawings and examples.
Description of the drawings
Fig. 1 is the tissue morphology figure on fore-put powder type flux-cored wire open arc built-up welding high-chromium alloy surface layer.
Fig. 2 is the phase composition figure on fore-put powder type flux-cored wire open arc built-up welding high-chromium alloy surface layer shown in Fig. 1.
Fig. 3 is the tissue morphology figure on flux-cored wire open arc built-up welding high-chromium alloy surface layer.
Fig. 4 is the phase composition figure on flux-cored wire open arc built-up welding high-chromium alloy surface layer shown in Fig. 3.
Fig. 5 is fore-put powder type flux-cored wire open arc built-up welding high-chromium alloy and the tissue morphology figure at Q235A basal body interfaces.
Fig. 6 is flux-cored wire open arc built-up welding high-chromium alloy and the tissue morphology figure at Q235A basal body interfaces.
Fig. 7 is the wear morphology figure of fore-put powder type flux-cored wire open arc built-up welding high-chromium alloy shown in Fig. 1.
Fig. 8 is the wear morphology figure of flux-cored wire open arc built-up welding high-chromium alloy shown in Fig. 3.
Specific implementation mode
In conjunction with attached drawing, the side of the preset alloy powder type flux-cored wire of the present invention and its self-shield open arc built-up welding high-chromium alloy Method, formation mechenism and following structural features:
(i) it introduces and includes preset alloy powder and flux-cored wire powder core is bonded high chromium hardfacing alloy source, and in medicine core It is added in the ferrosilicon and fore-put powder of 8~10% silicon content 40~47% of mass percent in welding wire powder core and mass percent is added The no less than ferrosilicon of 24% silicon content 40~47%, the repulsive interaction using silicon to carbon are reverse to increase high carbon and chromium elementide Stability, reduce its unstability and form brittleness eutectic ((α-Fe+M3(C, B)) probability;
(ii) it in 2~3% high-melting-point titanium carbide of mass percent/TiC is added in flux-cored wire powder core, is allowed to as high-carbon height The heterogeneous nucleation core of chromium atom cluster and reduce its forming core energy, promotion preferentially formed with high carbon and chromium elementide it is nascent M7C3Phase;
(iii) in built-up welding unit length weld seam, the preset alloy for being equivalent to the consumed flux-cored wire quality of built-up welding 40%~60% Powder to control melt characteristic and institutional framework, and can make built-up welding deposition efficiency under the conditions of welding energy consumes not increased Improve 36%~55%;
(iv) under the conditions of welding energy is not increased, preset alloying powder fusing consumes a part of arc energy, subtracts Small bath superheat degree reduces the residual thermal stress of weld seam without discharging stress by cracking;
(v) under the conditions of welding energy is not increased, preset the consumed flux-cored wire quality of built-up welding 40%~60% of being equivalent to Alloy powder significantly reduces the diluting effect of base material composition, forms hypereutectic structure organization at hardfacing alloy combination interface, carries High hardfacing alloy global tissue uniformity;
(vi) it is equipped with welding current 440~460A of controlling value, setting is combined with preset alloy powder type flux-cored wire quality Regulation and control melt pattern, form it into comprising high carbon ferro-chrome particles fuse into the heterogeneous molten of liquid high carbon and chromium elementide Body realizes the directly greatly nascent M of forming core length using liquid high carbon and chromium elementide as ingredient donor7C3The height of wear-resisting phase solidification Evanohm.
Referring to attached drawing, the side of the preset alloy powder type flux-cored wire of the present invention and its self-shield open arc built-up welding high-chromium alloy Method is realized in:
The type flux-cored wire diameter of phi 3.2, is made of, wherein powder core is by various types powder powder core and external portion two parts Powder material forms, such as high carbon ferro-chrome, ferrosilicon, graphite and vanadium iron;External portion selects H08A thin steel strips.
High carbon ferro-chrome, ferrosilicon, ferro-boron and the reduced iron powder constituent that the preset alloy powder of welding bead is combined by different grain size.Weldering Before, with welding bead per 1000mm2Uniformly mixed alloy powder is first preset on welding bead by the mode of preset 12.5g alloy powders, The powder bed of formation width 16mm, and fore-put powder is made highly to be consistent everywhere, then use MZ-1000 welding machines by flux-cored wire The self-shield open arc welding on Q235A steel plates, the preset alloy powder of fusing institute, forms width about 20mm first layer weld seams.Wait for weld seam sky It is cooled to 100 DEG C hereinafter, again according to the preset alloy powder of first layer welding bead configuration requirement on first layer weld seam, then uses medicine core Welding wire open arc self-shield built-up welding, while preset alloy powder is melted, second layer weld seam is formed, postwelding is air-cooled.
It is added a large amount of graphite in flux-cored wire, when weldering is oxidized to carbon monoxide and carbon dioxide gas, i.e., spontaneous enough Protective gas purifies weld seam with enhance melt to cover molten bath, with appropriate amount ferrosilicon, ferro-boron and ferromanganese from deoxidation.
When flux-cored wire self-shield open arc welding, electric arc one end melts flux-cored wire and forms droplet transfer built-up welding molten bath;It is another Preset alloy powder and heated molten bath are melted in end, since the end electric arc is dissipated than flux-cored wire end electric arc, cause preset alloy Change powder fully to melt, and under percussion of the blow force of arc to molten bath is involved in the preset alloy powder at welding bead both ends molten Pond reduces the mobility of melt and weakens its blow force of arc stirring action, forms and is not completely melt or fritting alloy group Divide the heterogeneous melt of particle mixing, wherein forming liquid high carbon and chromium elementide comprising high carbon ferro-chrome particles fuse, this is Nascent M7C3Phase forming core provides " undulating composition " and " rise and fall of structure " effect, and the cooling of open arc bead-on-plate weld is fast to provide the phase again " fluctuation of energy " needed for forming core, thus using this high carbon and chromium elementide as ingredient donor, can rapid crystallization be nascent M7C3 Phase.
Based on this, above-mentioned nascent M7C3The precipitation mode of phase is to be used in this field and obtain expected technology effect for the first time Fruit.
First, it by 440~460A of current control value and preset alloy powder controlling of quality bath properties, is allowed to form packet The heterogeneous melt of high carbon ferro-chrome elementide made of particles fuse containing high carbon ferro-chrome;Secondly, the alloys such as appropriate V, Mo are added Component is allowed to be solid-solution in high carbon and chromium elementide, increases these high carbon and chromiums original using V, Mo and the good affinity of carbon The stability of sub- cluster;Meanwhile a large amount of silicon components are added, so that silicon atom is distributed in high carbon and chromium elementide surrounding, the row of being formed The resistance for denounceing carbon atom diffusion, inversely increases the stability of these high carbon and chromium elementides;In addition, appropriate TiC particles are added, Heterogeneous nucleation core is provided for the crystallization of high carbon and chromium elementide, reduces its forming core energy, promotes nascent M7C3It is mutually more easy to be precipitated.
In conjunction with attached drawing, above-mentioned factor synergistic effect increases the stability of liquid high carbon and chromium elementide, promotes to come into being M7C3It mutually preferentially forms, such as the nascent M of attached drawing 17C3The volume fraction and amounts of particles of phase are obviously made a farfetched comparison Fig. 3 and are increased;Meanwhile subtracting High carbon and chromium unstability probability is lacked, the generation of brittleness eutectic has been reduced, as shown in attached drawing 1, attached drawing 2 and attached drawing 3, attached drawing 4;Secondly, The diluted adverse effect of base material composition is eliminated, forms hypereutectic structure organization at hardfacing alloy combination interface, such as attached drawing 5 and attached Shown in Fig. 6.
In conjunction with attached drawing, so far, which is:Optimize flux-cored wire component and preset alloy powder group Point, by current value and fore-put powder controlling of quality melt characteristic, it is allowed to be formed comprising high made of high carbon ferro-chrome particles fuse The heterogeneous melt of the liquid high carbon and chromium elementide of stability quickly forms nascent M as crystallization donor7C3It is wear-resisting Phase obtains the high chromium hardfacing alloy of excellent in abrasion resistance to reduce the formation probability of brittleness eutectic, such as 8 institute of attached drawing 7 and attached drawing Show.
Embodiment 1
In conjunction with attached drawing, high carbon ferro-chrome, ferrosilicon, graphite, vanadium are weighed by the composition and ratio requirement of flux-cored wire powder core when making Iron and other alloy powders, all powder all cross 60 mesh sieve.The YHZ-1 flux-cored wires that flux-cored wire is manufactured in certain Co., Ltd The standby molding of shaping mechanism.The flux-cored wire outer layer foreskin is H08A cold-rolled strips (width 16mm × thickness 0.36mm, the same below), It is equipped with ferroalloy, graphite, carbide and metal powder in foreskin and constitutes powder core, powder core composition mass percent is:High carbon chromium Iron 65%, ferrosilicon 9%, crystalline flake graphite 8%, vanadium iron 8%, mid-carbon fe-mn 4%, molybdenum-iron 2%, TiC 2%, reduced iron powder 2%, institute It is 45% to state powder core filling rate.Rolling is 4.4 flux-cored wires of Φ after each component of powder core stirs evenly, with each tube reducing 0.2mm, Drawing tube reducing is 3.2 welding wires of Φ successively.
Preset alloy powder group becomes:High carbon ferro-chrome 55%, ferrosilicon 24%, ferro-boron 16%, reduced iron powder 5%, all powder 60 mesh sieve is crossed at end, and preset alloy powder stirs evenly after being weighed according to its composition and ratio.Before weldering, with every 1000mm2Preset 12.5g The mode of alloy powder, alloy powder is preset on welding bead, forms the bisque of width 16mm, and make everywhere bisque it is highly consistent, Then in the test plate (panel) of 120mm × 80mm × 16mm (Q235A steel) by flux-cored wire welding machine MZ-1000 self-shield open arc weldings, heap Current control value 460A is welded, other technological parameters are as shown in table 1, and melt the preset alloy powder of institute, form width 20mm first layers Weld seam;Then, with every 1000mm2The mode of preset 12.5g alloy powders, the preset alloyed powder last layer on first layer weld seam, The wide 16mm of bisque, flux-cored wire self-shield open arc welding, and fore-put powder is melted, form second layer weld seam.Postwelding weld seam flawless And the defects of stomata, only micro residue.
Table 1:Flux-cored wire self-shield open arc bead-welding technology parameter
In conjunction with attached drawing, the processing of bead weld specimen line cutting technology is prepared as 57mm × 25.5mm × 6mm wearability samples, It is used in combination HR-150 Rockwell apparatuses to test its case hardness.
Abrasion test uses the wheeled abrasion tester of MLS-225B type damp sand rubber, experimental condition as follows:Rubber wheel is straight Diameter 178mm, hardness are 60 Shao Er, and added counterweight weighs 2.5 kilograms, and 240 revs/min of rubber wheel speed, mortar ratio was 60 mesh 1500 grams of quartz sands of sieve match 1000 grams of tap water.1000 turns of sample elder generation pre-grinding, is rinsed well, and drying claims initial weight M0, then just Formula cleans drying after testing 1000 turns, and weigh M1, sample abrasion absolutely mistake quality Δ M=M0-M1.It is with 1 bead weld specimen of comparative example Standard sample 1#, relative wear coefficient ε=standard sample absolutely lose quality/sample and absolutely lose quality, and test result is shown in Table 2.
Embodiment 2
In conjunction with attached drawing, high carbon ferro-chrome, ferrosilicon, graphite, vanadium are weighed by the composition and ratio requirement of flux-cored wire powder core when making Iron and other alloy powders, all powder all cross 60 mesh sieve.The YHZ-1 flux-cored wires that flux-cored wire is manufactured in certain Co., Ltd The standby molding of shaping mechanism.The flux-cored wire outer layer foreskin is H08A cold-rolled strips (16mm × 0.36mm), and iron conjunction is equipped in foreskin Gold, graphite, carbide and metal powder constitute powder core, and the composition (mass percent) of the powder core is:High carbon ferro-chrome 60%, ferrosilicon 10%, crystalline flake graphite 7%, vanadium iron 6%, mid-carbon fe-mn 3%, molybdenum-iron 3%, TiC 3%, reduced iron powder 8%, the powder core filling Rate is 47%.Rolling is 4.4 flux-cored wires of Φ after each component of powder core stirs evenly, and with each tube reducing 0.2mm, drawing successively subtracts Diameter is 3.2 welding wires of Φ.
Fore-put powder group becomes:High carbon ferro-chrome 45%, ferrosilicon 36%, ferro-boron 16%, reduced iron powder 3%, fore-put powder rule Model and implementation step content are with embodiment 1, and current control value is 440A when built-up welding, and other contents are the same as embodiment 1.
Embodiment 3
In conjunction with attached drawing, high carbon ferro-chrome, ferrosilicon, stone are weighed by the composition and ratio requirement of flux-cored wire powder core when making Ink, vanadium iron and other alloy powders, all powder all cross 60 mesh sieve.The YHZ-1 medicines that flux-cored wire is manufactured in certain Co., Ltd The standby molding of core welding wire shaping mechanism.The flux-cored wire outer layer foreskin is H08A cold-rolled strips (16mm × 0.36mm), is matched in foreskin Powder core is constituted with ferroalloy, graphite, carbide and metal powder, the composition (mass percent) of the powder core is:High carbon ferro-chrome 63%, ferrosilicon 8%, crystalline flake graphite 9%, vanadium iron 7%, mid-carbon fe-mn 5%, molybdenum-iron 3%, TiC 2%, reduced iron powder 3%, it is described Powder core filling rate is 46%.Rolling is 4.4 flux-cored wires of Φ after each component of powder core stirs evenly, with each tube reducing 0.2mm, according to Secondary drawing tube reducing is 3.2 welding wires of Φ.
Preset powder constituent of setting is:High carbon ferro-chrome 50%, ferrosilicon 30%, ferro-boron 18%, reduced iron powder 2%, fore-put powder Specification and implementation step content are with embodiment 1, and current control value is 450A when built-up welding, and other contents are the same as embodiment 1.
Embodiment 4
In conjunction with attached drawing, high carbon ferro-chrome, ferrosilicon, stone are weighed by the composition and ratio requirement of flux-cored wire powder core when making Ink, vanadium iron and other alloy powders, all powder all cross 60 mesh sieve.The YHZ-1 medicines that flux-cored wire is manufactured in certain Co., Ltd The standby molding of core welding wire shaping mechanism.The flux-cored wire outer layer foreskin is H08A cold-rolled strips (16mm × 0.36mm), is matched in foreskin Powder core is constituted with ferroalloy, graphite, carbide and metal powder, the composition (mass percent) of the powder core is:High carbon ferro-chrome 61.5%, ferrosilicon 10%, crystalline flake graphite 7%, vanadium iron 6%, mid-carbon fe-mn 3%, molybdenum-iron 3%, TiC 2.5%, reduced iron powder 7%, the powder core filling rate is 46.5%.Rolling is 4.4 flux-cored wires of Φ after each component of powder core stirs evenly, to subtract every time Diameter 0.2mm, drawing tube reducing is 3.2 welding wires of Φ successively.
Preset powder constituent of setting is:High carbon ferro-chrome 48%, ferrosilicon 32%, ferro-boron 16%, reduced iron powder 4%, fore-put powder Specification and implementation step content are with embodiment 1, and current control value is 445A when built-up welding, and other contents are the same as embodiment 1.
Embodiment 5
In conjunction with attached drawing, high carbon ferro-chrome, ferrosilicon, stone are weighed by the composition and ratio requirement of flux-cored wire powder core when making Ink, vanadium iron and other alloy powders, all powder all cross 60 mesh sieve.The YHZ-1 medicines that flux-cored wire is manufactured in certain Co., Ltd The standby molding of core welding wire shaping mechanism.The flux-cored wire outer layer foreskin is H08A cold-rolled strips (16mm × 0.36mm), is matched in foreskin Powder core is constituted with ferroalloy, graphite, carbide and metal powder, the composition (mass percent) of the powder core is:High carbon ferro-chrome 64%, ferrosilicon 8%, crystalline flake graphite 8.5%, vanadium iron 8%, mid-carbon fe-mn 4%, molybdenum-iron 3%, TiC 2.5%, reduced iron powder 2%, The powder core filling rate is 45.5%.Rolling is 4.4 flux-cored wires of Φ after each component of powder core stirs evenly, with each tube reducing 0.2mm, drawing tube reducing is 3.2 welding wires of Φ successively.
Preset powder constituent of setting is:High carbon ferro-chrome 53%, ferrosilicon 28%, ferro-boron 16%, reduced iron powder 3%, fore-put powder Specification and implementation step content are with embodiment 1, and current control value is 455A when built-up welding, and other contents are the same as embodiment 1.
Table 2:The Abrasive Resistance of Stubble-cleaning of comparison example and each embodiment hardfacing alloy
Comparison example 1
Using commercially available rich chromium cast iron flux-cored wire (Φ 3.2) 120mm × 80mm × 16mm test plate (panel) (Q235A steel) On, with two layers, welding current 550A of welding machine MZ-1000 self-shield open arcs built-up welding, other technological parameters are as shown in table 1.Single layer heap Postwelding remained on surface has a small amount of slag, and the transversal crack at the intervals 8~12mm occurs, and the double-deck heap postwelding face of weld also lacks Measure longitudinal crack.
The processing of wearability sample, hardness test and abrasion test content are the same as embodiment 1.
Comparison example 2
High chromium flux-cored wire (Φ 3.2) using the present invention on the test plate (panel) (Q235A steel) of 120mm × 80mm × 16mm, Not preset alloy powder, with two layers, welding current 450A of welding machine MZ-1000 self-shield open arcs built-up welding, other technological parameters such as table 1 It is shown.Built-up welding rear surface remains the defects of micro slag, flawless and stomata.
The processing of wearability sample, hardness test and abrasion test content are the same as embodiment 1.
From table 2 it can be seen that the relative wear coefficient ε of welding bead fore-put powder type flux-cored wire built-up welding high-chromium alloy of the present invention It is 3.19~3.61 times of commercially available rich chromium cast iron flux-cored wire hardfacing alloy, wherein being closed without the high chromium of fore-put powder flux-cored wire built-up welding Gold is 2.06 times of commercially available rich chromium cast iron flux-cored wire hardfacing alloy.Fore-put powder type flux-cored wire built-up welding high-chromium alloy it is wear-resisting Property increases 1.13~1.55 times than the relative wear coefficient ε of no fore-put powder flux-cored wire, wearability be improved significantly.In advance It sets the built-up welding of powder flux-cored wire open arc not crack for two layers, there is higher toughness.The preset alloy powder of welding bead not only improves built-up welding Deposition efficiency, and improve the wearability of hardfacing alloy, and reduce material cost and manufacturing cost.

Claims (7)

1. a kind of preset alloy powder type flux-cored wire, it is characterised in that the preset alloy powder of welding bead, then use with mild steel H08A cold rolling thin steel strips are outer layer foreskin, and high carbon ferro-chrome, ferrosilicon, graphite and other metal powders are equipped in foreskin and constitutes medicine core weldering The mass percentage of silk powder core, component is respectively:
Preset alloy powder
High carbon ferro-chrome/FeCr70C8.0 45~55% that chrome content is 68~72%, phosphorus content is 8%
Ferrosilicon/FeSi45 24~36% that silicon content is 40~47%
Ferro-boron/FeB18C0.5 16~20% that boron content is 18%
Iron-holder is not less than 98% reduced iron powder/Fe surpluses;
Flux-cored wire powder core
High carbon ferro-chrome/FeCr70C8.0 60~65% that chrome content is 68~72%, phosphorus content is 8%
Ferrosilicon/FeSi45 8~10% that silicon content is 40~47%
Phosphorus content is not less than 98% crystalline flake graphite/C 7~9%
Vanadium iron/FeV50-A 6~8% that vanadium content is 50%
Mid-carbon fe-mn/FeMn80C1.5 3~5% that manganese content is 78~85%, phosphorus content is 1.5%
Molybdenum-iron/FeMo50-A 2~3% that amount containing molybdenum is 50%
Titanium carbide/TiC 2~3%
Iron-holder is not less than 98% reduced iron powder/Fe surpluses
The flux-cored wire powder core filling rate is 45~47%.
2. preset alloy powder type flux-cored wire according to claim 1, it is characterised in that preset alloy powder and medicine core The mass percentage of welding wire powder core, component is respectively:
Preset alloy powder
High carbon ferro-chrome/FeCr70C8.0 50% that chrome content is 68~72%, phosphorus content is 8%
Ferrosilicon/FeSi45 30% that silicon content is 40~47%
Ferro-boron/FeB18C0.5 18% that boron content is 18%
Iron-holder is not less than 98% reduced iron powder/Fe 2%;
Flux-cored wire powder core
High carbon ferro-chrome/FeCr70C8.0 63% that chrome content is 68~72%, phosphorus content is 8%
Ferrosilicon/FeSi45 8% that silicon content is 40~47%
Phosphorus content is not less than 98% crystalline flake graphite/C 9%
Vanadium iron/FeV50-A 7% that vanadium content is 50%
Mid-carbon fe-mn/FeMn80C1.5 5% that manganese content is 78~85%, phosphorus content is 1.5%
Molybdenum-iron/FeMo50-A 3% that amount containing molybdenum is 50%
Titanium carbide/TiC 2%
Iron-holder is not less than 98% reduced iron powder/Fe 3%
The flux-cored wire powder core filling rate is 46%.
3. a kind of self-shield open arc built-up welding high-chromium alloy using preset alloy powder type flux-cored wire described in claim 1 Method, it is characterised in that before weldering, first alloy powder is preset on welding bead, while being equipped with welding current controlling value, in built-up welding list When bit length weld seam, the regulation and control melt pattern being combined with preset alloy powder type flux-cored wire quality is set, packet is formed it into Particles fuse containing high carbon ferro-chrome forms the heterogeneous melt of liquid high carbon and chromium elementide, realizes with liquid high carbon and chromium atom Cluster greatly nascent M of forming core length for ingredient donor7C3The high-chromium alloy of wear-resisting phase solidification;Matter is added in the flux-cored wire powder core The molybdenum-iron component and preset alloy powder for measuring vanadium iron and 2~3% amounts containing molybdenum 50% that percentage is 6~8% vanadium contents 50% are added Mass percent is no less than the ferrosilicon of 24% silicon content 40~47%.
4. the side of the self-shield open arc built-up welding high-chromium alloy of preset alloy powder type flux-cored wire according to claim 3 Method, it is characterised in that 2~3% titanium carbide granule of mass percent is added in flux-cored wire open arc self-shield built-up welding.
5. the side of the self-shield open arc built-up welding high-chromium alloy of preset alloy powder type flux-cored wire according to claim 3 Method, it is characterised in that flux-cored wire powder core and preset alloy powder component all cross 60 mesh sieve.
6. the side of the self-shield open arc built-up welding high-chromium alloy of preset alloy powder type flux-cored wire according to claim 3 Method, it is characterised in that welding current controlling value is:440~460A.
7. the side of the self-shield open arc built-up welding high-chromium alloy of preset alloy powder type flux-cored wire according to claim 3 Method, it is characterised in that when built-up welding unit length weld seam, preset alloy powder type flux-cored wire quality is flux-cored wire needed for built-up welding The 40%~60% of quality.
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CN107363431B (en) * 2017-08-28 2019-03-12 湘潭大学 A kind of self-shield open arc built-up welding austenitic matrix flux-cored wire and its application method
CN108620763B (en) * 2018-05-03 2019-06-21 湘潭大学 A kind of high boron flux-cored wire of self-shield open arc
CN109290698B (en) * 2018-11-20 2020-07-28 湘潭大学 Method for preparing high-boron alloy by using composite powder particles and solid welding wires as surfacing materials
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