CN101406997B - Surfacing electrode for green refabrication technology for composite bimetal hot shear edge - Google Patents
Surfacing electrode for green refabrication technology for composite bimetal hot shear edge Download PDFInfo
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- CN101406997B CN101406997B CN2008100796449A CN200810079644A CN101406997B CN 101406997 B CN101406997 B CN 101406997B CN 2008100796449 A CN2008100796449 A CN 2008100796449A CN 200810079644 A CN200810079644 A CN 200810079644A CN 101406997 B CN101406997 B CN 101406997B
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Abstract
The invention discloses a compound bimetal hot shear edge green reproducing technique surfacing electrode. A coating of the electrode covering comprises the following components in weight percentage: 1 to 2 percent of titanium white powder, 30 to 40 percent of marble, 10 to 20 percent of fluorite, 3 to 7 percent of quartz, 2 to 4 percent of chalk, 0 to 2 percent of soda, 5 to 9 percent of high carbon ferrochrome, 2 to 5 percent of high-carbon ferromanganese, 1 to 4 percent of ferrosilicon, 6 to 9 percent of ferrotitanium, 2 to 4 percent of ferrovanadium, 3 to 6 percent of ferromolybdenum, 2 to 4 percent of cerium oxide, 2 to 4 percent of lanthanum oxide, 5 to 9 percent of metallic nickel, 4 to 7 percent of ferrotungsten and 2 to 5 percent of graphite; the core wire is a H08A steel welding wire; and, the modulus of the adopted bonding agent water glass is between 2.7 and 3.0, and the Baume degree concentration is between 48 and 50. The surfacing electrode does not need the before-welding pre-heating and the after-welding heat treatment and can repair and reproduce the hot shear edge under conditions of at the relative low-temperature pre-heating and heat treatment, and the deposited weld metal has good anti-crack performance and can be conveniently used on site; the hardness range is HRC45 to 55; and, under the condition of no pre-heating and no heat treatment, the service life of the repaired parts is nearly 3 times longer than that of the original parts, and under the conditions of pre-heating and heat treatment, the service life is improved by 6 to 8 times.
Description
Technical field
The present invention relates to the Materials Science and Engineering field, particularly relate to a kind of green refabrication technology for composite bimetal hot shear edge surfacing welding.
Background technology
Hot-shear blade is the main tool that iron and steel enterprise is used for cutting off hot rolling steel billet.During work, upper and lower cutting edge is directly cut off at the red heat steel billet about with 1000 ℃ under the immense pressure effect, and cools off cutting edge rapidly by cooling water.Bear bigger compression and impact during cutting edge work, simultaneously, edge surface has strong thermal friction and heat fatigue effect.Above service condition requires cutting edge integral body to have higher yield strength and impact flexibility preferably, and the cutting edge part also requirement have higher red hardness and thermal fatigue property.At present, the hot-shear blade of domestic use adopts quenching+average tempering to handle mostly, because cutting edge part elevated temperature strength and red hardness deficiency, loses efficacy because of cutting edge wearing and tearing or distortion very soon in the production, causes cutting edge very low service life.
Adopt built-up welding can repair waste and old hot-shear blade, still, because of its carbon equivalent higher, if adopt traditional overlaying method, even adopt weld preheating, post weld heat treatment.In weld deposit process and in the postwelding use, also very easily ftracture.Thereby limited the extensive use of technique for overlaying.
Hot-shear blade generally is by manufacturings such as the 3Cr2W8V that contains alloying element, H13,5CrNiMo, 5CrMnMo and 5CrW2Si, 6Cr2W2Si.The whole not only expense costliness of parts such as hot-shear blade of making, and since working lining only on the surface, the advantage of inner valuable alloying element can not be brought into play fully.If adopt the green remanufacturing technology to make hot-shear blade, promptly the material of different performance is adopted on the matrix of parts and top layer, not only can bring into play the comprehensive technical performance of parts and the operating potential of material, can also save a large amount of valuable alloys.
Re-manufacturing technology is to utilize original parts, adopts high-new surface engineering technology and other process technology to make parts resizing, shape and performance, forms to make blank again, forms the product of making again through process.Particularly green remanufacturing is to be main target with high-quality, efficient, energy-conservation, material-saving, environmental protection, consider the strategy of manufacturing again in the whole life cycle of parts as a whole, scrap (retired) product in the environmental pollution minimum thereby make, reach best performance under the highest situation of resource utilization again.
Therefore, develop a kind of surfacing welding that has than high-wearing feature, be applied to built-up welding and repair waste and old hot-shear blade, or the matrix adopting ordinary carbon steel thereon the deposited metal of built-up welding one deck high abrasion make the compound hot-shear blade of bimetallic, not only huge economic benefit will be produced, but also the huge social benefit can be produced.
Summary of the invention
In order to realize that hot-shear blade is carried out built-up welding reparation and green remanufacturing, the invention provides the green re-manufacturing technology surfacing welding of a kind of bimetal composite hot-shear blade.The characteristics of this welding rod are need not carry out preheating to the phosphorus content cutting edge little than low dimensional before weldering, carry out the built-up welding reparation under the situation that postwelding need not be heat-treated, and can guarantee that postwelding does not ftracture, and can reach performance requirement.
This class is used for the built-up welding reparation and green remanufacturing bimetallic hot-shear blade is characterised in that: the chemical composition of electrode coating is wt%: titanium dioxide 1～2%, marble 30～40%, fluorite 10～20%, quartz 3～7%, chalk 2～4%, soda ash 0～2%, high carbon ferro-chrome 5～9%, high carbon ferromanganese 2～5%, ferrosilicon 1～4%, ferrotianium 6～9%, vanadium iron 2～4%, molybdenum-iron 3～6%, cerium oxide 2～4%, lanthanum-oxides 2～4%, metallic nickel 5～9%, ferrotungsten 4～%7, graphite 2～5%.Core wire is a H08A steel welding wire.The modulus of the water glass of binder that adopts is 2.7～3.0, and concentration (Baume degrees) is 48～50.For needing to carry out Passivation Treatment before ferrosilicon, high carbon ferro-chrome and the high carbon ferromanganese use, the passivation technology silicon iron powder is 720～750 ℃, and the high carbon ferro-chrome powder is 550～600 ℃, and the high carbon ferromanganese powder is 300～350 ℃, and above metal dust all is incubated 1 hour.
The principle of hot-shear blade surfacing welding design is according to hot-shear blade in use, the hot-shear blade that not only requires the built-up welding reparation to reach after making again will have higher thermal fatigue resistance and wearability when its work, but also requires to have higher anti-cracking performance after the built-up welding.Consider from the thermal fatigue resistance and the wearability angle that improve deposited metal, deposited metal will have certain phosphorus content, and alloying elements such as an amount of chromium, manganese, silicon are arranged, guarantee the intensity of matrix, also will add a certain amount of tungsten and molybdenum element, separate out with the carbide form of tungsten and molybdenum in the course of the work, disperse is distributed on the matrix, produce the post-curing effect, improve its wearability.Consider that from the anti-cracking performance angle that improves deposited metal excessive carbon can improve the hardenability of deposited metal, increase the quantity of lamellar martensite, thereby increase the tearing tendency of deposited metal; Can crystal grain thinning and add titanium, vanadium, add nickel and can improve stabilization of austenite, slow down the transformation of austenite to lamellar martensite, increase remained austenite content, improve the moulding of deposited metal, toughness; Particularly adding rare earth oxide can deoxidation, desulfurization, purifies the built-up welding molten bath, and crystallization of refinement crystal grain, and rotten field trash all can improve the anti-cracking performance of deposited metal.In addition, from inventor's past to the numerical simulation study work of built-up welding residual stress field as can be known, reduce martensite and begin transition temperature Ms point and can reduce the residual stress of deposited metal, thereby make the medium and high carbon steel parts exempt from preheating, exempt under the heat treated condition built-up welding and also do not ftracture.Therefore, in deposited metal, add metal Ni and can reduce the Ms point, reduce the residual stress of deposited metal.Particularly,, therefore, reduce its stress distribution and seem particularly important because its composition is immutable for the mother metal heat affected area.1), the suitable phosphorus content of assurance so novel built-up welding and the design principle of making again with flux-cored wire are:, thereby guarantee the hardness of suitable deposited metal; 2), add alloying elements such as an amount of chromium, manganese, silicon, guarantee that deposited metal has higher competency; 3), add an amount of tungsten and molybdenum element, in use, carbide is separated out with carbide form disperse on matrix of tungsten and molybdenum owing to be heated to high temperature, produce the post-curing effect, improve the wearability of hot-shear blade; 4), add an amount of rare earth oxide, to improve postwelding primary solidification structure and secondary solidification structure, rotten field trash, the toughness of raising hot-shear blade; 5), add an amount of metal nickel powder, to improve built-up welding tissue, reduction martensitic transformation temperature Ms point improves stress distribution.By composition adjustment and optimization, make hardness scope between HRC45-55 of serial deposited metal.
The invention has the beneficial effects as follows: adopt surfacing welding of the present invention that hot-shear blade is carried out built-up welding reparation and green remanufacturing, simplified manufacture method, reduced energy resource consumption, avoided the pollution of manufacture process environment; Make waste and old hot-shear blade recover original shape and size by exempting from preheating and exempting from the heat treatment built-up welding, and improved its service life, the cutting edge after the reparation is longer than about 3 times of former cutting edges service life.And the bigger cutting edge of phosphorus content higher dimensional is only needed low-temperature prewarming or heat treatment, and just can guarantee that postwelding does not ftracture, and can reach performance requirement, can improve 6～8 times service life.Really realized green remanufacturing, the ubiquitous hot-shear blade of China's metallurgical machinery sector is carried out the built-up welding reparation and this difficult problem of green remanufacturing has the important engineering meaning to solving, and its market space is very wide.
Embodiment:
Following public is one embodiment of the present of invention, and the chemical composition of electrode coating is wt%: titanium dioxide 1.4%, marble 30.6%, fluorite 14.3%, quartz 3.6%, chalk 2.8%, soda ash 0.5%, high carbon ferro-chrome 6.7%, high carbon ferromanganese 3.8%, ferrosilicon 2.1%, ferrotianium 7.2%, molybdenum-iron 5.7%, vanadium iron 2.1%, the oxide 2.2% of cerium, the oxide 2.2% of lanthanum, metallic nickel 7%, ferrotungsten 4.7%, graphite 3.1%.Core wire adopts H08A steel welding wire.The modulus of the water glass of binder that adopts is 2.7～3.0, and concentration (Baume degrees) is 48～50.For needing to carry out Passivation Treatment before ferrosilicon, high carbon ferro-chrome and the high carbon ferromanganese use, the passivation technology silicon iron powder is 730 ℃, and the high carbon ferro-chrome powder is 560 ℃, and the high carbon ferromanganese powder is 320 ℃, and above metal dust all is incubated 1 hour.Adopt batch mixer to mix in the relevant powder in the above-mentioned prescription, add waterglass then and stir, squeeze out welding rod, welding rod is dried, carry out bistrique mill tail then at 250～300 ℃ with the welding rod coating machine.
Adopt the surfacing welding of above-mentioned manufacturing that the hot-shear blade of scrapping is made again, before the weldering welding rod was dried 1 hour at 300～400 ℃, remove the crystallization water in the coating, use DC welder, carry out reversal connection, welding current is 150～200A, and weldingvoltage is 70～80V.Before welding, need not carry out preheating to hot-shear blade, postwelding need not be heat-treated, the hardness on the hot-shear blade surface of making again by built-up welding is HRC48, it is carried out machining, reach the dimensional requirement of former hot-shear blade, in use, the temperature on hot-shear blade surface can be heated to 550 ℃, is equivalent to carry out temper, and its case hardness can reach HRC53.Through the built-up welding reparation or the hot-shear blade of making again can replace the hot-shear blade of producing through monoblock cast, not only reduced manufacturing process, saved the raw material and the energy, more improved service life simultaneously.
Claims (1)
1. green refabrication technology for composite bimetal hot shear edge surfacing welding, it is characterized in that: the chemical composition of electrode coating is wt%: titanium dioxide 1～2%, marble 30～40%, fluorite 10～20%, quartz 3～7%, chalk 2～4%, soda ash 0～2%, high carbon ferro-chrome 5～9%, high carbon ferromanganese 2～5%, ferrosilicon 1～4%, ferrotianium 6～9%, vanadium iron 2～4%, molybdenum-iron 3～6%, cerium oxide 2～4%, lanthanum-oxides 2～4%, metallic nickel 5～9%, ferrotungsten 4～7%, graphite 2～5%; Core wire is a H08A steel welding wire; The modulus of the water glass of binder that adopts is 2.7～3.0, and Baume degrees is 48～50.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008100796449A CN101406997B (en) | 2008-10-22 | 2008-10-22 | Surfacing electrode for green refabrication technology for composite bimetal hot shear edge |
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| CN2008100796449A CN101406997B (en) | 2008-10-22 | 2008-10-22 | Surfacing electrode for green refabrication technology for composite bimetal hot shear edge |
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| CN101406997A CN101406997A (en) | 2009-04-15 |
| CN101406997B true CN101406997B (en) | 2011-05-04 |
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101920407B (en) * | 2010-05-16 | 2012-06-27 | 十堰金科化工有限公司 | Novel alloy tool steel welding electrode |
| CN102229028A (en) * | 2011-05-25 | 2011-11-02 | 燕山大学 | Special welding rod for bead weld repairing and remanufacturing of trimming die and using method of special welding rod |
| CN102240872A (en) * | 2011-05-25 | 2011-11-16 | 燕山大学 | Special welding rod for stack welding repair and reproduction of hot-forging die |
| CN102198574A (en) * | 2011-05-25 | 2011-09-28 | 燕山大学 | Special welding strip for surfacing-repairing and remanufacturing cold working mold |
| CN102554502B (en) * | 2011-12-07 | 2014-04-16 | 燕山大学 | Special electrode for overlaying and repairing high-chromium cast iron type high-speed rail substructure tamping pick |
| CN102528321A (en) * | 2011-12-07 | 2012-07-04 | 燕山大学 | Special welding rod used for surfacing reparation of high carbon steel type high-speed railway base tamping pick |
| CN103028864B (en) * | 2012-12-14 | 2014-11-19 | 中国船舶重工集团公司第七二五研究所 | High-strength and high-toughness metal powder type flux-cored wire with no need of being pre-heated before welded |
| CN104476013A (en) * | 2014-10-31 | 2015-04-01 | 河海大学常州校区 | Tungsten-strengthened wear-resisting surfacing electrode and preparation method thereof |
| CN105583548B (en) * | 2016-01-26 | 2017-12-01 | 北京力佳利焊接材料有限公司 | Aldecor metal core welding wire available for double gas shielded arc weldings |
| CN110977252A (en) * | 2019-12-25 | 2020-04-10 | 安徽应流铸业有限公司 | Welding rod for repair welding of steel casting |
| CN112975195B (en) * | 2021-02-09 | 2023-04-07 | 天津市金桥焊材集团股份有限公司 | 600 MPa-level fire-resistant weather-resistant steel welding rod |
| CN113927199A (en) * | 2021-10-18 | 2022-01-14 | 攀枝花学院 | Rare earth-containing ilmenite type welding rod and preparation method thereof |
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| SU273901A1 (en) * | 1968-07-29 | 1975-10-05 | Днепропетровский металлургический завод им.Петровского | Electrode coating for surfacing |
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| CN1148529A (en) * | 1995-10-24 | 1997-04-30 | 李向荣 | Preheating-free high anti-cracking surfacing welding electrode |
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- 2008-10-22 CN CN2008100796449A patent/CN101406997B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU273901A1 (en) * | 1968-07-29 | 1975-10-05 | Днепропетровский металлургический завод им.Петровского | Electrode coating for surfacing |
| CN88105652A (en) * | 1988-01-05 | 1988-07-06 | 湘潭大学 | Superhardness wornoutless nopreheating build-up welding rod |
| CN1089200A (en) * | 1992-12-29 | 1994-07-13 | 陈保国 | Rare-earth type crack-resisting welding electrode without preheating for build-up welding |
| CN1148529A (en) * | 1995-10-24 | 1997-04-30 | 李向荣 | Preheating-free high anti-cracking surfacing welding electrode |
| CN1644299A (en) * | 2005-01-24 | 2005-07-27 | 燕山大学 | Build-up welding electrode for composite double-metal big gear re-manufacturing technology |
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| CN101406997A (en) | 2009-04-15 |
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Granted publication date: 20110504 Termination date: 20131022 |