CN105081611A - Special fine-diameter flux-cored wire for hot-working die repairing surfacing - Google Patents
Special fine-diameter flux-cored wire for hot-working die repairing surfacing Download PDFInfo
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- CN105081611A CN105081611A CN201510608310.6A CN201510608310A CN105081611A CN 105081611 A CN105081611 A CN 105081611A CN 201510608310 A CN201510608310 A CN 201510608310A CN 105081611 A CN105081611 A CN 105081611A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3053—Fe as the principal constituent
- B23K35/3073—Fe as the principal constituent with Mn as next major constituent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/40—Making wire or rods for soldering or welding
- B23K35/406—Filled tubular wire or rods
Abstract
The invention provides a special fine-diameter flux-cored wire for hot-working die repairing surfacing. The special fine-diameter flux-cored wire comprises a welding stick pipe wall and powder wrapped in the welding stick pipe wall. The powder comprises a deoxygenation alloying agent and a slag former. Nanometer chromium nitride powder is added in iron-based alloy powder, a fine nitride interstitial phase is formed in surfacing metal, and the surfacing metal has good tenacity and good crack resistance. Meanwhile, yttrium oxide is added in alloy powder, the surfacing metal is purified, balling is carried out on inclusions, a nitride strengthening phase is promoted to be formed, and the fatigue resistance of the surfacing metal is improved. A hot-working die is repaired through a gas metal arc welding technology with the cooperation of the flux-cored wire and rich-chlorine gas protection, and the obtained surfacing metal has the superior high-temperature oxidization resistance, the superior abrasion resistance, the superior cleanliness and the good fatigue resistance.
Description
Technical field
The invention belongs to field of welding material, particularly relate to a kind of thin diameter flux wire being exclusively used in hot-work die reparation built-up welding.
Background technology
In recent years, along with China's metallurgical industry and manufacturing fast development, mould is hot-work die particularly, and the consumption as Heat Working Rolls, hot-forging die, hot extruding die, hot blanking die etc. is increasing, has now become one of expendable part widely applied in industrial production.Mould in use peels off because wearing and tearing and the reason such as heat fatigue can produce, abrade, wearing and tearing etc. and losing efficacy.The service life of how to improve it is the study hotspot paid close attention to both at home and abroad always.The life-span of mould depends primarily on several aspects such as mold materials, structural design, Technology for Heating Processing, processing.China's die life only has external 1/2-1/3, there is the problem that precision is low, the process-cycle is long.In view of the inefficacy of mould is mostly by surface, from the saving energy and resource, give full play to material property potentiality and obtain property and maximum technical economic benefit, the performance of raising and improvement die-face material is the key extending die life.In production, the normal method of built-up welding that adopts prepares alloy-layer on die blank, obtains bimetallic mould, both reduces cost, and turn improved the performance of mould; Built-up welding is also the important technical that repairing mould extends its life-span.Built-up welding needs the welding material supporting with various die steel.
The welding material that built-up welding is commonly used has welding rod and welding wire.Welding rod adopts gas slag Combined Protection, and metallurgical quality is better, can by coating and core wire transition alloy elements, and weld seam impurity content is few, cleanliness factor is higher, and weld seam has higher anti-fatigue performance.Welding rod uses flexibly simultaneously, is also relatively applicable to the short weld seam of mould repair and irregular weld seam operating mode.Therefore, welding rod is usually used in the Bead weld repair of small mould, people have developed multiple hot-work die surfacing welding for this reason, the percentage by weight (wt%) being patent " hot forged mould Bead weld repair and again manufacture special welding rod " its chemical composition of coating of CN102240872A as publication No. is titanium dioxide 1-3, marble 25-40, fluorite 10-15, quartzy 3-5, chalk 2-4, high carbon ferro-chrome 8-12, high carbon ferromanganese 2-4, ferrosilicon 2-4, ferrotianium 6-9, molybdenum-iron 9-11, cerium oxide 4-8, metallic nickel 5-8, graphite 1-2; Core wire is H08A.This welding rod adopts Cr-Ni-Mo alloy system, the maximum level of electrode coating medium high carbon ferrochrome is 12%, the Cr content of deposited metal is far below 11%, be difficult to ensure that deposited metal has enough oxidation resistances below 800 DEG C and 800 DEG C, poor for high-temperature oxidation resistance during hot-work die built-up welding; The carbide former mainly Cr that this patent welding rod adds, the carbide of Cr is interstitial compound, the fusing point of interstitial compound and hardness are not so good as the height of gap phase, also decompose than being easier to during heating, nitride and some carbide (carbide as Ti, V, Nb) form gap phase, gap has the advantages such as high rigidity, high-melting-point, size be tiny mutually, but this welding rod does not adopt nitride strengthening; In addition, the alloying element that this welding rod plays Grain refinement only has Mo.Authorization Notice No. CN2507605Y " Mold Surfacing Electrode " utility model patent proposes a kind of flux-cored electrode tubular electrode for mould built-up welding, this welding rod makes conductive carrier with high-quality seamless steel pipe, pipe is outer scribbles coating, fills granular alloy medicine core in pipe, and end welding is provided with bare terminal end.This patent does not relate to the concrete formula of medicine core and coating.Though welding rod has above-mentioned advantage, welding rod is unsuitable for automatic welding, and built-up welding efficiency is lower, uses few in the built-up welding of large-scale hot-work die.Welding wire can be used for automatic welding, and welding efficiency is high, welding quality stable, and therefore, welding wire is the welding material that large mold built-up welding is commonly used.Welding wire is divided into solid welding wire and flux-cored wire, deposited metal of dies alloying element content is higher, the solid welding wire that alloying element content is high manufactures difficulty, so mould built-up welding mainstay core welding wire, especially the metal powder core solder wire mainly formed for medicinal powder with metal and ferroalloy powder is most widely used, the adjustment of metal powder core solder wire alloying component easily, manufacture easy, weld seam substantially without slag, multiple-bead deposit without the need to scarfing cinder, welding production efficiency is high, also can not produce dreg defect.In recent years, people compare attention to research and development mould built-up welding metal powder core solder wire, patent of invention " tungsten-pole argon arc-welding metal-powder-core weld wire for aged martensite steel and manufacture method thereof " as Authorization Notice No. CN1093450C discloses a kind of argon tungsten-arc welding metal powder core solder wire for mould built-up welding, in metal-powder-core, the weight proportion of each powder is: 39-78%Ni, 0-26%Co, 0-18%Mo, 0.2-6%Ti, 0.7-1.68%Al, 0.2-1.455%Nb, 0-0.72%Re, 0-0.15%Te, 0-0.25%Se, 0.02-0.04%B, 0.01-0.02%Zr, 0.01-0.1%Ca, the percentage by weight that medicine core accounts for welding wire is 30-52%.Authorization Notice No. is that CN103008924B patent of invention " a kind of flux-cored wire for forging mold built-up welding and application " discloses a kind of flux-cored wire for forging mold, welding wire adopts carbon steel steel band parcel medicine core powder, flux-cored wire filling rate is 30% ~ 37%, medicine core powder comprises the material of following mass percentage: calcirm-fluoride 4% ~ 7%, soda ash 0.5% ~ 3%, quartz 0.5% ~ 4%, rutile 2% ~ 6%, high carbon ferro-chrome 13.6% ~ 27.2%, pure chromium powder 13.9% ~ 19.2%, nickel powder 2.2% ~ 5.7%, electrolytic manganese 1.8% ~ 4.3%, molybdenum-iron powder 6.3% ~ 13.2%, ferrosilicon powder 2.1% ~ 5.0%, vanadium iron powder 0.6% ~ 1.9%, surplus is reduced iron powder.Application number is that the disclosed flux-cored wire of 201410748560.5 patents of invention " a kind of hot forged mould Gas Shielded welding flux-cored wire " adopts Cr-Ni-Mo-W-V-Co alloy system, adopts CO
2gas shielded arc welding, adds Co and improve oxidative resistance, red hardness, anti-wear performance, but cost significantly improves.
Deposited metal high-temperature oxidation resistance is excellent, wearability is good, cleanliness factor is high, have the deposited metal flux-cored wire of good fatigue resistance energy is that Making mold manufactures the welding material of urgent need again with reparation, and particularly during built-up welding, the large-scale hot-work die of displacement difficulty is badly in need of the flux-cored wire of all-position welding excellent performance especially.The performance of such flux-cored wire of current China with also there is larger gap abroad.Research and development hot-work die flux-cored welding wire for overlaying welding is significant for the raising hot-work die life-span.
Summary of the invention
For the deficiencies in the prior art, the present invention provides a kind of mould flux-cored wire special of martensitic matrix by the optimal design that alloy powder is filled a prescription, by adding nano chromium nitride powder and yittrium oxide in iron(-)base powder, enable deposited metal meet the technical requirements such as hot-work die high-temperature oxidation resistance, high-wearing feature, high-cleanness, high, anti-fatigue performance simultaneously.
Although existing deposited metal is that the flux-cored wire of flux-cored wire with Ni-based in hardness, compactness, bond strength etc. of iron-based is about the same, the toughness of iron-based deposited metal, lower than Ni-based, is difficult to the requirement meeting high tenacity.The molten bath life period of the arc weldings such as argon-rich gas shielded gas metal-arc welding is short, adopts its metallurgical reaction of micron powder insufficient, is difficult to form abundant nitride, carbide hard phase.Therefore, improving its toughness and cracking resistance by adding nano chromium nitride powder in the present invention, the standard-required of hot-work die high tenacity and cracking resistance can be reached.Meanwhile, nanometer grade powder is active large, and metallurgical reaction is violent, makes up the drawback that arc welding molten bath life period is short, metallurgical reaction is insufficient, makes it be suitable for the arc welding methods such as argon-rich gas shielded gas metal-arc welding, submerged-arc welding.
Wherein, described " hot-work die " mainly refers to hammer forging die tool, hot heading mould, hot-extrusion mold, hot blanking die, finish forge mould or die casting etc.
Concrete technical scheme is as follows:
Be exclusively used in the thin diameter flux wire that hot-work die repairs built-up welding, comprise welding wire tube wall and be wrapped in the medicinal powder in it; Described medicinal powder package is containing deoxidizing alloy and slag former, and described slag former accounts for the 8-10% of medicinal powder gross mass, and described deoxygenated alloy agent prescription is as follows in mass parts: electrolytic manganese 4-8,45# ferrosilicon 2-6, ferrotianium 1-4, chromium carbide 4-8, graphite 0-5, vanadium iron 2-6, molybdenum-iron 12-18, tungsten powder 2-4, nickel powder 4-8, nano silicon nitride chromium powder 1-2, yittrium oxide powder 2-6; The formula of slag former is as follows in mass parts: rutile 5-8, potassic feldspar 2-3, potassium fluosilicate 2-3, Fluorspar Powder 1-3.
Deposited metal containing nano silicon nitride chromium powder has excellent high temperature hardness, anti-wear performance, and good toughness and cracking resistance, and therefore, nano silicon nitride chromium powder preferably uses as the basic material of the hardfacing alloy powder for the formation of hot-work die.
Wherein, when the content of nano silicon nitride chromium powder is lower than 1 mass parts, high temperature hardness, anti-wear performance, toughness and cracking resistance bad.On the other hand, if the content of nano silicon nitride chromium powder is higher than 2 mass parts, deposited metal easily produces gas hole defect, and cost also raises.The present invention confirms following result: if when the content of nano silicon nitride chromium powder is not less than 1 mass parts and is no more than 2 mass parts, can obtain the high temperature hardness of expectation, anti-wear performance, toughness and cracking resistance.
Yittrium oxide rare earth as except metal and ferroalloy, nanometer chrome nitride, slag former and inevitably except impurity more than point and the metal oxide that comprises, it plays purification deposited metal, nodularization field trash, impels formation nitride gap phase, improves the effect of the anti-fatigue performance of deposited metal.With regard to its content, although cannot treat different things as the same, when the content of yittrium oxide is lower than 2 mass parts, yittrium oxide may be caused to purify and anti-fatigue performance decreased effectiveness.
On the other hand, when the content of yittrium oxide is higher than 6 mass parts, high temperature hardness and wear resistance decrease may be caused, therefore, in the application, the addition of yittrium oxide is limited to below 6 mass parts, therefore can not produce the problems referred to above.
Preferably, described deoxygenated alloy agent prescription is as follows in mass parts: electrolytic manganese 5-8,45# ferrosilicon 3-6, ferrotianium 2-4, chromium carbide 6-8, graphite 2-5, vanadium iron 3-6, molybdenum-iron 14-18, tungsten powder 2.5-4, nickel powder 5-8, nano silicon nitride chromium powder 1.2-2, yittrium oxide powder 3-6; The formula of slag former is as follows in mass parts: rutile 6-8, potassic feldspar 2.4-3, prodan 2.4-3, Fluorspar Powder 1.5-3.
Preferably, described deoxygenated alloy agent prescription is as follows in mass parts: electrolytic manganese 5-7,45# ferrosilicon 3-5, ferrotianium 2-3, chromium carbide 6-7, graphite 2-4, vanadium iron 3-5, molybdenum-iron 14-16, tungsten powder 2.5-3.5, nickel powder 5-7, nano silicon nitride chromium powder 1.2-1.6, yittrium oxide powder 3-5; The formula of slag former is as follows in mass parts: rutile 6-7, potassic feldspar 2.4-2.8, prodan 2.4-2.8, Fluorspar Powder 1.5-2.5.
The composition of described electrolytic manganese by quality ratio Mn content is not less than 99.5%; The composition of 45# ferrosilicon is 40.0% ~ 47.0%Si, 0.1%C by quality ratio, and remaining is Fe and the impurity not affecting performance; The composition of ferrotianium is 23% ~ 35%Ti, 8.5%Al, 5%Si, 2.5%Mn by quality ratio, and remaining is Fe and the impurity not affecting performance; Cr is not less than 85%, C is by quality ratio that 12% ~ 14%, Si is not more than 0.3%, S and is no more than 0.02%, P and is no more than 0.02%, Fe and is no more than 0.5%, the remaining impurity for not affecting performance for the composition of chromium carbide; The composition of graphite is 94% ~ 99%C by quality ratio; The composition of vanadium iron is 50%V, 0.2%C, 2%Si, 0.8%Al by quality ratio, and remaining is Fe and the impurity not affecting performance; The composition of molybdenum-iron is 50%Mo, 3%Si by quality ratio, and remaining is Fe and the impurity not affecting performance; The composition of tungsten powder by quality ratio W content is not less than 98%; The composition of metal nickel powder by quality ratio Ni content is not less than 98%; The composition Y by percentage to the quality of yttrium oxide powder
2o
3content is not less than 99%; The composition of potassic feldspar is 62-72%SiO by percentage to the quality
2, 17-24%Al
2o
3, K
2o+Na
2o is not less than 12%, K
2o is not less than 8%, S and is no more than 0.04%, P and is no more than 0.04%.The composition TiO by percentage to the quality of rutile
2content is not less than 92%; The composition K by percentage to the quality of potassium fluosilicate
2siF
4content is not less than 98%; The composition CaF by percentage to the quality of Fluorspar Powder
2content is not less than 95%.The granularity of above-mentioned powder is 75 microns ~ 180 microns (namely granularity is-80 order ~+200 orders).The composition of nano silicon nitride chromium powder by quality ratio CrN content is not less than 99%, granularity more than 99% be less than 100 nanometers.The impurity not affecting its performance containing being difficult in process remove is allowed in the composition of above-mentioned medicinal powder.
In the present invention, adding of nano chromium nitride powder, tiny nitride gap phase can be formed in deposited metal, utilize nano chromium nitride powder crystal grain thinning (granularity of nano chromium nitride powder is less than 100 nanometers) simultaneously, improve the high temperature hardness of deposited metal, anti-wear performance, and make it have good toughness, cracking resistance and anti-fatigue performance, nanoscale chromium nitride powder activity is large, metallurgical reaction is violent, arc surfacing molten bath life period can be made up short, the drawback that metallurgical reaction is insufficient, be suitable for argon-rich gas shielded gas metal-arc welding, the arc surfacing techniques such as submerged-arc welding, on the other hand, in order to meet the requirement of deposited metal high-cleanness, high, anti-fatigue performance, by adding yittrium oxide rare earth in alloy powder, purifying deposited metal, nodularization field trash, impelling formation nitride strengthening phase, improving the anti-fatigue performance of deposited metal.Designed by rational alloy system, make deposited metal obtain martensitic matrix tissue and add a small amount of residual austenite soma, and using nitride, carbide as hardening constituent; Preferred by Metallurgical processing and raw material, reduce the impurity contents such as deposited metal S, P, and improve processing performance.
With regard to iron(-)base powder of the present invention, it at least comprises following alloying element: C, N, Si, Mn, Cr, Mo, V, Ti, Ni, W.When containing above-mentioned alloying element in iron(-)base powder, the deposited metal of preparation has certain high temperature hardness and corrosion resistance, can ensure that chromium nitride and yittrium oxide strengthen the maximization of effect.
The medicinal powder of thin diameter flux wire also can have the material powder of other metal powder than that described above or alloyed powder to form by collaboration.Now, of the present inventionly prerequisite to be characterized as not destroy.
In the present invention, the medicinal powder of flux-cored wire special is that the powder such as chromium nitride, vanadium iron, ferrosilicon, ferrotianium are mixed, and in order to reduce welding material cost, reducing spatter, improve arc stability, improving appearance of weld, preferably adding a certain amount of slag former,
Wherein, rutile, potassic feldspar, prodan, Fluorspar Powder, as slag former, play slag making, stable arc, reduce the effect of splashing, and make deposited metal surface quality obtain the effect promoted further.During use, make the content of rutile, potassic feldspar, prodan, Fluorspar Powder in described scope.When the total content of rutile, potassic feldspar, prodan, Fluorspar Powder is lower than 10 mass parts, its slag making, stable arc, reduction are splashed, the effect that improves deposited metal surface forming is not obvious.On the other hand, if when the total content of rutile, potassic feldspar, prodan, Fluorspar Powder is higher than 17 mass parts, the effect that stabilising arc, reduction splash also is improved no longer further, and relatively reduces the addition of alloying element.Confirm following result: during the scope making rutile, potassic feldspar, prodan, Fluorspar Powder content respectively more than 10 mass parts and below 17 mass parts, good stabilising arc can be obtained, reduce splashing, improve the shaping effect of deposited metal.
With regard to hardfacing alloy powder of the present invention, the granularity of preferred described electrolytic manganese, 45# ferrosilicon, ferrotianium, chromium carbide, graphite, vanadium iron, molybdenum-iron, tungsten powder, nickel powder, yittrium oxide powder, rutile, potassic feldspar, prodan and Fluorspar Powder is 75 microns ~ 180 microns.(namely granularity is-80 order ~+200 orders).
Preferably, when alloy powder of the present invention, for the treatment of during hot die steel, (carbon mass fraction is generally less than 0.5%, the alloying element often added has: Cr, Mn, W, Mo, V, Si, Ni, Nb, Al etc.), in general, owing to the addition of Cr in cladding layer, Ni, the elements such as Mo, therefore galvanic cell can be formed between cladding layer and base material, thus generation electrochemical corrosion, but all with the addition of Cr due in hot-work die itself and cladding powder, elements such as Ni, Mo and make electrochemical reaction be difficult to Fast Persistence to carry out.First, Cr to be dissolved in the alloy in Ni thus to form Ni-Cr solid solution, and plays significant passivation; Secondly, in corrosion process, Cr part replaces the Fe in rusty scale alpha-feooh, defines oxyhydroxide α-(Fe1-xCrx) OOH.Because this rusty scale microstructure is comparatively fine and close and relatively stable, matrix material and corrosive medium well can be isolated, its high impedance simultaneously well can reduce again the speed of electrochemical reaction.And Mo can in steel crystal grain thinning, solution strengthening, formed cured layer, this cured layer is combined with matrix firmly, formation passivation, thus there is good protective value.Simultaneously because the interaction time of laser beam in laser cladding process and powder is short, therefore in cooling procedure rapidly, there is larger cooling degree, and the alloying element in powder can form multiple compounds, the quantity of further increase non-spontaneous forming core, greatly improve nucleation rate, finally make the fine microstructures of cladding layer fine and close.Fine and closely woven tissue not only reduces the impurity content on unit crystal boundary, and decreases the component segregation formed owing to cooling fast, thus reduces the impact of the accelerated corrosion because of galvanic effect.So, no matter be from corrosion weight loss amount, or according to having more scientific corrosion weight loss rate analysis, all illustrate that hot-work die comprises Cr, Ni, during Mo tri-kinds of elements, the sample of cladding layer has better corrosion resistance, and does not accelerate the corrosion of base material due to electrochemical corrosion and galvanic effect.Demonstrate powder of the present invention and there is the decay resistance consistent with base material, well meet the designing requirement that hot-work die reparation manufactures again.
The cross sectional shape of flux-cored wire is more complicated, more symmetrical, and electric arc is more stable, and metallurgical reaction and the protective effect of medicine core are more abundant.But along with the reduction of gage of wire, this difference reduces gradually.With regard to flux-cored wire of the present invention, when gage of wire is 1.6mm, during flux-cored wire cross sectional shape employing " O " type, arc stability is the highest.
In above-mentioned hot-work die flux-cored welding wire for overlaying welding: the tube wall preferably 430 stainless steel belt preparations of described flux-cored wire.
Preferred embodiment: the tube wall of described flux-cored wire selects wall thickness to be 0.3 ~ 0.35mm, width is the 430 stainless steel belt preparations of 10mm; Its chemical composition is preferred by percentage to the quality: Cr content is that 16-18%, C are not more than 0.12%, Si is not more than 0.75%, Mn is not more than 1.0%, S is not more than 0.03%, P is not more than 0.04%, Ni is not more than 0.6%, remaining be Fe and the impurity not affecting performance.
The filling rate of above-mentioned hot-work die flux-cored welding wire for overlaying welding be 25% ~ 35% (filling rate is the ratio of medicinal powder quality and medicinal powder, steel band quality sum).
In above-mentioned medicinal powder, the effect of each component is as follows:
The effect of electrolytic manganese is component controlling, and manganese metal impurity content is few, is beneficial to the purification of deposited metal.
The effect of 45# ferrosilicon is component controlling, combines add medicinal powder with electrolytic manganese, silicomanganese combined deoxidation effective.
The effect of ferrotianium is deoxidation, and carbide precipitate TiC and nitride TiN, crystal grain thinning, by thin brilliant and precipitated phase two kinds of mode strengthen welds, improves the hardness of deposited metal.
The effect of chromium carbide is that Resistance of Weld Metal plays solution strengthening effect to weld metal transition Cr and C, simultaneously carbide precipitate strengthen welds, and Cr content reaches the high-temperature oxidation resistance that more than 11% can also improve deposited metal.
The effect of graphite is to weld seam transition C, controls the suitable C content of weld seam and forms carbide, ensure the hardness of weld seam.
The effect of vanadium iron is alloying, forms carbide, nitride, crystal grain thinning.
The effect of molybdenum-iron is alloying, crystal grain thinning, solution strengthening, forms carbide, improves high-temperature behavior and the anti-wear performance of deposited metal.
The effect of tungsten powder is alloying, to weld seam transition W, improves high temperature hardness and the wear resistance at elevated temperature of weld metal.
The effect of nickel powder to improve stabilization of austenite, slow down austenite to martensitic transformation, increase remained austenite content, improve plasticity, the toughness of deposited metal, and martensite start temperature Ms point can be reduced, the residual stress of deposited metal can be reduced.
The effect of nano silicon nitride chromium powder is to weld seam transition N, forms nitride, crystal grain thinning with nitride forming element Ti, V, Cr etc., improves high temperature hardness and the structure stability of weld metal; To weld metal transition Cr.Nanometer powder is active large, and metallurgical reaction is abundant.
The effect of yittrium oxide reduces Welding seam inclusion content, makes inclusion balling, and purification weld metal, improves the anti-fatigue performance of weld metal; Reduce the surface tension of molten drop, impel the droplet transfer, reduce and splash.
The effect of rutile is slag making, stabilising arc, regulates the physical property of slag, improves appearance of weld.
The effect of potassic feldspar is stable arc, reduces and splashes, improve processing performance, slag making.
The effect of potassium fluosilicate is stable arc, reduces and splashes, and reduces viscosity coefficient of dross, improves processing performance, slag making.
The effect of fluorite is slag making, the fusing point regulating slag and viscosity, increases the mobility of slag.
The preparation method of hot-work die flux-cored welding wire for overlaying welding of the present invention comprises the following steps:
(1) join the proportioning weighing medicinal powder that powder is filled a prescription by medicinal powder, first graphite less for proportion, rutile, potassic feldspar, potassium fluosilicate, Fluorspar Powder are pressed after formula rate weighs and mixed, mix powder 8-10 minute with existing mixed powder machine, obtain slag former mixed-powder; Then join in slag former mixed powder after the deoxidizing alloys such as electrolytic manganese, 45# ferrosilicon, ferrotianium, crome metal, high carbon ferro-chrome, vanadium iron, molybdenum-iron, tungsten powder, nickel powder, nano silicon nitride chromium powder, yittrium oxide powder being weighed by formula rate, continue mixed powder 8-10 minute again, obtain medicinal powder.
Wherein: described medicinal powder package is containing deoxidizing alloy and slag former, medicinal powder deoxygenated alloy agent prescription is as follows in mass parts: electrolytic manganese 4-8,45# ferrosilicon 2-6, ferrotianium 1-4, chromium carbide 4-8, graphite 0-5, vanadium iron 2-6, molybdenum-iron 12-18, tungsten powder 2-4, nickel powder 4-8, nano silicon nitride chromium powder 1-2, yittrium oxide powder 2-6; The formula of slag former is as follows in mass parts: rutile 5-8, potassic feldspar 2-3, potassium fluosilicate 2-3, Fluorspar Powder 1-3.Slag former is the 8-10% of medicinal powder quality.The granularity of nano silicon nitride chromium powder be more than 99% be less than 100 nanometers, the granularity of other powder is 75 microns ~ 180 microns (namely granularity is-80 order ~+200 orders);
(2) after 10 mm wides, 0.3 ~ 0.35 millimeters thick 430 stainless steel belt being cleaned with ultrasonic cleaning apparatus, with existing flux-cored wire production equipment, above-mentioned steel band is rolled into U-shaped, in U-shaped grain, add the medicinal powder that step (1) is made again, filling rate (ratio of medicinal powder quality and flux-cored wire quality) is 25 ~ 35%;
(3) healed up by U-lag, medicinal powder is wrapped up wherein, the position that heals up adopts docking connected mode; Touched by wire drawing, by road drawing, tube reducing, finally make its diameter reach 1.6mm.
(4) the flux-cored wire layer of step (3) gained is coiled into dish, obtains hot-work die flux-cored welding wire for overlaying welding finished product.
With regard to flux-cored wire of the present invention, when the gas flow that MAG welds gas is less than 18L/min, the deflection of protective gas is not enough, and weld seam easily produces the defects such as pore; When gas flow is greater than 20L/min, not only waste gas, and oxidisability strengthens, and face of weld can be formed the dimmed oxide skin of one deck, weldquality is declined, likely produce turbulent flow simultaneously and reduce protected effect.Therefore, in the present invention, preferred gas flow is 18L/min-20L/min.
Arc voltage and welding current are the main technologic parameters of MAG weldering, key parameter when arc voltage is short circuiting transfer, and arc voltage and welding current match, and can obtain splashing little, the stabilized welding process that appearance of weld is good.Preferred welding current 300A-320A in the present invention; Voltage 28V-31V.
Because short circuiting transfer all adopts thin welding wire, so the resistance heat that electrode extension produces is very large to welding influential effect.Extension elongation increases, and the resistance heat on welding wire increases, and wire melting is accelerated, and productivity ratio improves.But for the present invention, when extension elongation is greater than 18mm, easily there is the fusing of the overheated section of forming in welding wire, and splash serious, welding process is unstable.After stretching out increase, the distance between nozzle and weldment also increases simultaneously, causes gas shield deleterious.But when extension elongation is less than 14mm, the distance between nozzle and weldment is too short, the easy plug nozzle of splashing metal.Therefore, the length that in the present invention, preferred welding wire stretches out ignition tip is 14mm-18mm.Above-mentioned hot-work die flux-cored welding wire for overlaying welding adopts full-argon gas shielded arc welding, welding current 300-320A; Voltage 28-31V; Gas flow rate 18-20L/min; Welding wire stretches out the length 14-18mm of ignition tip.The welding technological properties of welding wire is good, arc stability, splash little, crack resistance good.The hardness of deposited metal is HRC42-55.
The application of flux-cored wire of the present invention is not limited to gas shielded arc welding, also can be used for submerged-arc welding, electroslag welding etc.
The remarkable result that the present invention has is:
(1) this patent flux-cored wire is the thin diameter flux wire of diameter 1.6mm, can adopt current common apparatus welding, save equipment investment; Flux-cored wire has good processing performance, is suitable for automatic welding, and welding production efficiency is high.By forming the thin layer slag that a layer thickness is no more than 0.3mm, is evenly distributed at face of weld, improve appearance of weld, be also suitable for all-position welding.Manufacture and the reparation of the large-scale hot-work die of difficulty is conjugated when can be used for built-up welding.
(2) composition of deposited metal by changing the composition adjustment of flux-cored wire medicinal powder, can produce series of products for different hot die steels, applied range.
(3) this patent flux-cored wire optimizes deposited metal chrome content, makes deposited metal have good high-temperature oxidation resistance, significantly improves the service life of hot-work die.
(4) this patent flux-cored wire by adding nano silicon nitride chromium powder and nitride forming element in medicinal powder, by reaction fabricated in situ nitride, nitride has the advantages such as size is tiny, high-temperature stable mutually as gap, significantly improves high temperature hardness and the high-temperature stability of deposited metal.
(5) this patent is by steel band with medicinal powder is raw-material preferably (as selects simple metal, use ferroalloy less) and add rare earth, reduce deposited metal inclusion content, make inclusion balling, crystal grain thinning, improves the toughness of deposited metal, plasticity and anti-fatigue performance.
Detailed description of the invention
Embodiment 1:
(1) join the proportioning weighing medicinal powder that powder is filled a prescription by medicinal powder, first rutile less for proportion, potassic feldspar, potassium fluosilicate, Fluorspar Powder are pressed after formula rate weighs and mixed, mix powder 8 minutes with existing mixed powder machine, obtain slag former mixed-powder; Then join in slag former mixed powder after the deoxidizing alloys such as electrolytic manganese, 45# ferrosilicon, ferrotianium, chromium carbide, vanadium iron, molybdenum-iron, tungsten powder, nickel powder, nano silicon nitride chromium powder, yittrium oxide powder being weighed by formula rate, then continue mixed powder 8 minutes, obtain medicinal powder.
Wherein: described medicinal powder package is containing deoxidizing alloy and slag former, and medicinal powder deoxygenated alloy agent prescription is as follows in mass parts: electrolytic manganese 4,45# ferrosilicon 3, ferrotianium 2, chromium carbide 4, vanadium iron 2, molybdenum-iron 12, tungsten powder 2, nickel powder 4, nano silicon nitride chromium powder 1, yittrium oxide powder 2; The formula of slag former is as follows in mass parts: rutile 8, potassic feldspar 2, potassium fluosilicate 2, Fluorspar Powder 2.Slag former is 10% of medicinal powder quality.The granularity of nano silicon nitride chromium powder be more than 99% be less than 100 nanometers, the granularity of other powder is 75 microns ~ 180 microns (namely granularity is-80 order ~+200 orders);
(2) after the thick 430 stainless steel belt ultrasonic cleaning apparatus cleanings of 10mm is wide, 0.3mm, with existing flux-cored wire production equipment, above-mentioned steel band is rolled into U-shaped, in U-shaped grain, add the medicinal powder that step (1) is made again, filling rate (ratio of medicinal powder quality and flux-cored wire quality) is 35%;
(3) healed up by U-lag, medicinal powder is wrapped up wherein, the position that heals up adopts docking connected mode; Touched by wire drawing, by road drawing, tube reducing, finally make its diameter reach 1.6mm.
(4) the flux-cored wire layer of step (3) gained is coiled into dish, obtains hot-work die flux-cored welding wire for overlaying welding finished product.
Above-mentioned hot-work die flux-cored welding wire for overlaying welding adopts argon-rich gas Ar+1%CO
2the gas metal-arc welding of protection, welding current 300A-320A; Voltage 28V-31V; Gas flow rate 18L/min; Electrode extension 14mm.The welding technological properties of welding wire is good, arc stability, splash little, crack resistance good.The hardness of deposited metal is HRC42.
Embodiment 2:
(1) join the proportioning weighing medicinal powder that powder is filled a prescription by medicinal powder, first graphite less for proportion, rutile, potassic feldspar, potassium fluosilicate, Fluorspar Powder are pressed after formula rate weighs and mixed, mix powder 10 minutes with existing mixed powder machine, obtain non-alloyed mixed powder; Then join in non-alloyed mixed powder after the deoxidizing alloys such as electrolytic manganese, 45# ferrosilicon, ferrotianium, chromium carbide, vanadium iron, molybdenum-iron, tungsten powder, nickel powder, nano silicon nitride chromium powder, yittrium oxide powder being weighed by formula rate, then continue mixed powder 8 minutes, obtain medicinal powder.
Wherein: described medicinal powder package is containing deoxidizing alloy and slag former, and medicinal powder deoxygenated alloy agent prescription is as follows in mass parts: electrolytic manganese 8,45# ferrosilicon 6, ferrotianium 4, chromium carbide 8, graphite 3, vanadium iron 6, molybdenum-iron 18, tungsten powder 4, nickel powder 5, nano silicon nitride chromium powder 2, yittrium oxide powder 6; The formula of slag former is as follows in mass parts: rutile 5, potassic feldspar 1, potassium fluosilicate 3, Fluorspar Powder 1.Slag former is 8% of medicinal powder quality.The granularity of nano silicon nitride chromium powder be more than 99% be less than 100 nanometers, the granularity of other powder is 75 microns ~ 180 microns (namely granularity is-80 order ~+200 orders);
(2) after the thick 430 stainless steel belt ultrasonic cleaning apparatus cleanings of 10mm is wide, 0.3mm, with existing flux-cored wire production equipment, above-mentioned steel band is rolled into U-shaped, in U-shaped grain, add the medicinal powder that step (1) is made again, filling rate (ratio of medicinal powder quality and flux-cored wire quality) is 35%;
(3) healed up by U-lag, medicinal powder is wrapped up wherein, the position that heals up adopts docking connected mode; Touched by wire drawing, by road drawing, tube reducing, finally make its diameter reach 1.6mm.
(4) the flux-cored wire layer of step (3) gained is coiled into dish, obtains hot-work die flux-cored welding wire for overlaying welding finished product.
Above-mentioned hot-work die flux-cored welding wire for overlaying welding adopts argon-rich gas Ar+1%CO
2the gas metal-arc welding of protection, welding current 300A-320A; Voltage 28V-31V; Gas flow rate 20L/min; Electrode extension 18mm.The welding technological properties of welding wire is good, arc stability, splash little, crack resistance good.The hardness of deposited metal is HRC52.Embodiment 3:
(1) join the proportioning weighing medicinal powder that powder is filled a prescription by medicinal powder, first graphite less for proportion, rutile, potassic feldspar, potassium fluosilicate, Fluorspar Powder are pressed after formula rate weighs and mixed, mix powder 9 minutes with existing mixed powder machine, obtain non-alloyed mixed powder; Then join in non-alloyed mixed powder after the deoxidizing alloys such as electrolytic manganese, 45# ferrosilicon, ferrotianium, chromium carbide, vanadium iron, molybdenum-iron, tungsten powder, nickel powder, nano silicon nitride chromium powder, yittrium oxide powder being weighed by formula rate, then continue mixed powder 9 minutes, obtain medicinal powder.
Wherein: described medicinal powder package is containing deoxidizing alloy and slag former, and medicinal powder deoxygenated alloy agent prescription is as follows in mass parts: electrolytic manganese 6,45# ferrosilicon 4, ferrotianium 3, chromium carbide 6, graphite 3, vanadium iron 4, molybdenum-iron 15, tungsten powder 3, nickel powder 6, nano silicon nitride chromium powder 1, yittrium oxide powder 4; The formula of slag former is as follows in mass parts: rutile 7, potassic feldspar 2, potassium fluosilicate 3, Fluorspar Powder 2.Slag former is 10% of medicinal powder quality.The granularity of nano silicon nitride chromium powder be more than 99% be less than 100 nanometers, the granularity of other powder is 75 microns ~ 180 microns (namely granularity is-80 order ~+200 orders);
(2) after the thick 430 stainless steel belt ultrasonic cleaning apparatus cleanings of 10mm is wide, 0.35mm, with existing flux-cored wire production equipment, above-mentioned steel band is rolled into U-shaped, in U-shaped grain, add the medicinal powder that step (1) is made again, filling rate (ratio of medicinal powder quality and flux-cored wire quality) is 30%;
(3) healed up by U-lag, medicinal powder is wrapped up wherein, the position that heals up adopts docking connected mode; Touched by wire drawing, by road drawing, tube reducing, finally make its diameter reach 1.6mm.
(4) the flux-cored wire layer of step (3) gained is coiled into dish, obtains hot-work die flux-cored welding wire for overlaying welding finished product.
Above-mentioned hot-work die flux-cored welding wire for overlaying welding adopts argon-rich gas Ar+1.5%CO
2the gas metal-arc welding of protection, welding current 300A-320A; Voltage 28V-31V; Gas flow rate 18L/min; Welding wire stretches out the length 14mm of ignition tip.The welding technological properties of welding wire is good, arc stability, splash little, crack resistance good.The hardness of deposited metal is HRC48.
Embodiment 4:
(1) join the proportioning weighing medicinal powder that powder is filled a prescription by medicinal powder, first graphite less for proportion, rutile, potassic feldspar, potassium fluosilicate, Fluorspar Powder are pressed after formula rate weighs and mixed, mix powder 8 minutes with existing mixed powder machine, obtain non-alloyed mixed powder; Then join in non-alloyed mixed powder after the deoxidizing alloys such as electrolytic manganese, 45# ferrosilicon, ferrotianium, chromium carbide, vanadium iron, molybdenum-iron, tungsten powder, nickel powder, nano silicon nitride chromium powder, yittrium oxide powder being weighed by formula rate, then continue mixed powder 8 minutes, obtain medicinal powder.
Wherein: described medicinal powder package is containing deoxidizing alloy and slag former, and medicinal powder deoxygenated alloy agent prescription is as follows in mass parts: electrolytic manganese 4,45# ferrosilicon 3, ferrotianium 4, chromium carbide 8, graphite 2, vanadium iron 6, molybdenum-iron 12, tungsten powder 4, nickel powder 4, nano silicon nitride chromium powder 2, yittrium oxide powder 6; The formula of slag former is as follows in mass parts: rutile 6, potassic feldspar 3, potassium fluosilicate 2, Fluorspar Powder 1.Slag former is 8% of medicinal powder quality.The granularity of nano silicon nitride chromium powder be more than 99% be less than 100 nanometers, the granularity of other powder is 75 microns ~ 180 microns (namely granularity is-80 order ~+200 orders);
(2) after the thick 430 stainless steel belt ultrasonic cleaning apparatus cleanings of 10mm is wide, 0.3mm, with existing flux-cored wire production equipment, above-mentioned steel band is rolled into U-shaped, in U-shaped grain, add the medicinal powder that step (1) is made again, filling rate (ratio of medicinal powder quality and flux-cored wire quality) is 35%;
(3) healed up by U-lag, medicinal powder is wrapped up wherein, the position that heals up adopts docking connected mode; Touched by wire drawing, by road drawing, tube reducing, finally make its diameter reach 1.6mm.
(4) the flux-cored wire layer of step (3) gained is coiled into dish, obtains hot-work die flux-cored welding wire for overlaying welding finished product.
Above-mentioned hot-work die flux-cored welding wire for overlaying welding adopts argon-rich gas Ar+1.5%CO
2the gas metal-arc welding of protection, welding current 300A-320A; Voltage 28V-31V; Gas flow rate 16L/min; Electrode extension 16mm.The welding technological properties of welding wire is good, arc stability, splash little, crack resistance good.The hardness of deposited metal is HRC55.
Comparative example 1
This comparative example is with the difference of embodiment 1, oxygen-freeization yttrium in composition of raw materials, the thermal fatigue of deposited metal is tested, specimen size is 50 × 20 × 1.5 (mm), at 20mm central vertical thickness direction on one side, open 60 ° of v-notch, carry out the circulating-heating of 700 DEG C-20 DEG C, cooling, with the cycle-index reflection fatigue behaviour occurring 0.5mm crackle.The cycle-index of the comparative example 1 of oxygen-freeization yttrium powder is 21 times, and the cycle-index containing the embodiment 1 of yittrium oxide 2 parts (quality) is 43 times.By the comparison with embodiment 1, show that yittrium oxide of the present invention effectively can promote the anti-fatigue performance of deposited metal.
Comparative example 2
This comparative example is with the difference of embodiment 1, and do not add nano silicon nitride chromium powder in composition of raw materials, test the carrying out of toughness and cracking resistance, not the comparative example 2 of plus nano nitrogenize chromium powder, the test value of U-shaped notch impact toughness is 1.06J/cm
2, being the 5CrNiMo mould steel surface overlaying of 80mm at thickness, there is not crackle in preheating 250 DEG C of ability; The test value of the U-shaped notch impact toughness of embodiment 1 is 1.21J/cm
2, being the 5CrNiMo mould steel surface overlaying of 80mm at thickness, can not there is crackle in preheating 50 DEG C.Show that the nano silicon nitride chromium powder in medicine core of the present invention can improve toughness and the cracking resistance of deposited metal effectively.
Comparative example 3
This comparative example is with the difference of embodiment 1, granularity is adopted to be the nitrogenize chromium powder of 75 microns ~ 180 microns (namely granularity is-80 order ~+200 orders) in composition of raw materials, the hardness of surveying 500 DEG C is HRC36, the maxima and minima difference HRC6 of hardness; 500 DEG C of hardness of embodiment 1 are HRC41, the maxima and minima difference HRC4 of hardness.Nanometer chrome nitride keeps higher hardness under making deposited metal high temperature, and the hardness of deposited metal is more even.Micron-sized chromium nitride due to particle comparatively large, activity is less, because welding pool cooling velocity is fast under existing addition, causes metallurgical reaction insufficient, effectively cannot improve high temperature hardness and the structure stability of deposited metal.
Although above-mentioned, the specific embodiment of the present invention is described; but not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various amendment or distortion that creative work can make still within protection scope of the present invention.
Claims (10)
1. be exclusively used in the thin diameter flux wire that hot-work die repairs built-up welding, it is characterized in that, comprise welding wire tube wall and bag medicinal powder in the inner; Described medicinal powder package is containing deoxidizing alloy and slag former, and described slag former accounts for the 8-10% of medicinal powder gross mass, and described deoxygenated alloy agent prescription is as follows in mass parts: electrolytic manganese 4-8,45# ferrosilicon 2-6, ferrotianium 1-4, chromium carbide 4-8, graphite 0-5, vanadium iron 2-6, molybdenum-iron 12-18, tungsten powder 2-4, nickel powder 4-8, nano silicon nitride chromium powder 1-2, yittrium oxide powder 2-6; The formula of slag former is as follows in mass parts: rutile 5-8, potassic feldspar 2-3, potassium fluosilicate 2-3, Fluorspar Powder 1-3.
2. flux-cored wire as claimed in claim 1, it is characterized in that, described deoxygenated alloy agent prescription is as follows in mass parts: electrolytic manganese 5-8,45# ferrosilicon 3-6, ferrotianium 2-4, chromium carbide 6-8, graphite 2-5, vanadium iron 3-6, molybdenum-iron 14-18, tungsten powder 2.5-4, nickel powder 5-8, nano silicon nitride chromium powder 1.2-2, yittrium oxide powder 3-6; The formula of slag former is as follows in mass parts: rutile 6-8, potassic feldspar 2.4-3, prodan 2.4-3, Fluorspar Powder 1.5-3.
3. flux-cored wire as claimed in claim 1 or 2, it is characterized in that, described deoxygenated alloy agent prescription is as follows in mass parts: electrolytic manganese 5-7,45# ferrosilicon 3-5, ferrotianium 2-3, chromium carbide 6-7, graphite 2-4, vanadium iron 3-5, molybdenum-iron 14-16, tungsten powder 2.5-3.5, nickel powder 5-7, nano silicon nitride chromium powder 1.2-1.6, yittrium oxide powder 3-5; The formula of slag former is as follows in mass parts: rutile 6-7, potassic feldspar 2.4-2.8, prodan 2.4-2.8, Fluorspar Powder 1.5-2.5.
4. flux-cored wire as claimed in claim 1 or 2, is characterized in that, the composition of described electrolytic manganese by quality ratio Mn content is not less than 99.5%; The composition of 45# ferrosilicon is 40.0% ~ 47.0%Si, 0.1%C by quality ratio, and remaining is Fe and the impurity not affecting performance; The composition of ferrotianium is 23% ~ 35%Ti, 8.5%Al, 5%Si, 2.5%Mn by quality ratio, and remaining is Fe and the impurity not affecting performance; Cr is not less than 85%, C is by quality ratio that 12% ~ 14%, Si is not more than 0.3%, S and is no more than 0.02%, P and is no more than 0.02%, Fe and is no more than 0.5%, the remaining impurity for not affecting performance for the composition of chromium carbide; The composition of vanadium iron is 50%V, 0.2%C, 2%Si, 0.8%Al by quality ratio, and remaining is Fe and the impurity not affecting performance; The composition of molybdenum-iron is 50%Mo, 3%Si by quality ratio, and remaining is Fe and the impurity not affecting performance; The composition of tungsten powder by quality ratio W content is not less than 98%; The composition of metal nickel powder by quality ratio Ni content is not less than 98%; The composition Y by percentage to the quality of yttrium oxide powder
2o
3content is not less than 99%; The composition of potassic feldspar is 62-72%SiO by percentage to the quality
2, 17-24%Al
2o
3, K
2o+Na
2o is not less than 12%, K
2o is not less than 8%, S and is no more than 0.04%, P and is no more than 0.04%.The composition TiO by percentage to the quality of rutile
2content is not less than 92%; The composition K by percentage to the quality of potassium fluosilicate
2siF
4content is not less than 98%; The composition CaF by percentage to the quality of Fluorspar Powder
2content is not less than 95%.
5. flux-cored wire as claimed in claim 1 or 2, it is characterized in that, the granularity of described nano chromium nitride powder is less than 100 nanometers, and the granularity of described electrolytic manganese, 45# ferrosilicon, ferrotianium, chromium carbide, vanadium iron, molybdenum-iron, tungsten powder, nickel powder, yittrium oxide powder, rutile, potassic feldspar, prodan and Fluorspar Powder is 75 microns ~ 180 microns.
6. flux-cored wire as claimed in claim 1, is characterized in that, described welding wire tube wall adopts 430 stainless steel belt preparations.
7. flux-cored wire as claimed in claim 1, is characterized in that, described welding wire tube wall adopts wall thickness to be 0.3 ~ 0.35mm, and width is the 430 stainless steel belt preparations of 10mm; Its chemical composition is preferred by percentage to the quality: Cr content is that 16-18%, C are not more than 0.12%, Si is not more than 0.75%, Mn is not more than 1.0%, S is not more than 0.03%, P is not more than 0.04%, Ni is not more than 0.6%, remaining be Fe and the impurity not affecting performance.
8. flux-cored wire as claimed in claim 1, it is characterized in that, gage of wire is 1.6mm, and the filling rate of described flux-cored wire is 25% ~ 35%.
9. the argon-rich gas shielded consumable electrode gas protection welding method of the arbitrary described flux-cored wire of claim 1-8, it is characterized in that, technological parameter is as follows: welding current 300A-320A; Voltage 28V-31V; Gas flow 18L/min-20L/min; Electrode extension 14mm-18mm.
10. the application of the arbitrary described flux-cored wire of claim 1-8 in process hot die steel, is characterized in that, containing Cr, Ni, Mo in described hot die steel.
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| CN112975198A (en) * | 2021-02-24 | 2021-06-18 | 天津市金桥焊材集团股份有限公司 | Flux-cored wire for surfacing bottoming layer of efficient welding hot forging die |
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Effective date of registration: 20220114 Address after: 274000 juancheng Industrial Park, juancheng County, Heze City, Shandong Province (West of juancheng 15th Road and north of Industrial Branch Road) Patentee after: HEZE GUANGTAI WEAR-RESISTING RUBBER PRODUCTS Co.,Ltd. Address before: 250061, No. ten, No. 17923, Lixia District, Ji'nan City, Shandong Province Patentee before: SHANDONG University |