CN1304161C - High-hardness, wearable, self-protecting metal cored surfacing welding wire - Google Patents
High-hardness, wearable, self-protecting metal cored surfacing welding wire Download PDFInfo
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- CN1304161C CN1304161C CNB2004101015547A CN200410101554A CN1304161C CN 1304161 C CN1304161 C CN 1304161C CN B2004101015547 A CNB2004101015547 A CN B2004101015547A CN 200410101554 A CN200410101554 A CN 200410101554A CN 1304161 C CN1304161 C CN 1304161C
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Abstract
The present invention relates to a build-up welding metal core welding wire with high hardness, high wear resistance and self protection, which belongs to the welding field of material processing engineering. The welding wire of the present invention is characterized in that the metal core comprises the following substances of the percentages by weight: 64 to 77% of chromium carbide, 4 to 8% of 75# ferric silicon, 5 to 10% of manganese metal, 1 to 3% of aluminum-magnesium alloy, 2 to 5% of ferroboron, 2 to 6% of ferrotitanium, 1 to 5% of ferrocolumbium and 1 to 8% of ferrovanadium. No shield gas needs to be additionally added for the present invention. The problems of ventilation, seam welding with welding slag and slag removal do not need to be considered in the production process, and continuous multichannel welding can be carried out in the production process. Thereby, as long as programming is carried out for a welding gun of an automatic welder and the walk route of the welding gun is controlled, full-automatic production of 24 hour continuous operation without manual intervention can be realized. Manual labor intensity is largely reduced, and the efficiency of build-up welding production and repair is largely improved. The present invention is mainly applied to the build-up welding repair of coal grinding rollers, cement grinding discs, steel plant chutes, cold (hot) rolls, etc.
Description
Technical field
A kind of high-hardness, wearable, self-protecting metal cored surfacing welding wire belongs to the technique for overlaying field, and this invention is mainly used in the built-up welding reparation of coal-grinding roller, cement mill, the black groove of steel mill, cold (heat) roll etc.
Background technology
Existing technique for overlaying means mainly are manual electric arc pile up welding, automatic submerged-arc bead welding and plasma surfacing.These overlaying methods are the problem of various degrees all.Generally speaking mainly show as production efficiency low (as manual electric arc pile up welding can not be automatically, continuous sequence); Cost is too high (as automatic submerged-arc bead welding, 2～3 tons of solder flux of one ton of metal needs of built-up welding), energy consumption is excessive, and (solder flux of China's use at present is commonly smelting type welding flux, and produce one ton of smelting type welding flux power consumption is 2000～2500kwh, the power consumption of Unit Weight deposited metal when this energy consumption almost is equivalent to manual electric arc welding); Contaminated environment (produce volume of smoke in the production process of solder flux, smelting type welding flux is an expendable consumed product, can not regeneration, the processing of postwelding solder flux is a big problem).
Metal core welding wire is the international in recent years new trend that develops.Metal core welding wire is for slag type flux-cored wire, and its powder core major part is a metal powder, has only a spot of arc stabilizer and slag former.Why be evaluated as " wlding that replaces solid core welding wire ", it is strong point because of the few solid core welding wire of its existing quantity of slag, the strong point that has both high deposition rate, low spatter type flux-cored wire again, and hydrogen content can be limited in very low level at an easy rate, and cracking resistance is improved.Metal core welding wire and solid core welding wire or common flux-cored wire are compared, and productivity ratio improves, and weldquality is good, and the expense of filling metal is low, has reduced cleaning up cost.
Metal core welding wire and solid core welding wire or common flux-cored wire are compared, and mainly have following characteristics: 1. face of weld does not have slag, need not scarfing cinder in the continuous sequence process.2. deposition rate is fast.The overwhelming majority is a metal powder in the powder core of metal core welding wire, will inevitably increase substantially the burn-off rate of welding wire, and burn-off rate is apparently higher than common flux-cored wire and solid core welding wire.3. wide in variety, performance is good, price is low.Metal core welding wire is identical with the manufacture method of common flux-cored wire, so have both the advantage of common flux-cored wire, can produce the metal core welding wire of various compositions easily.The topmost advantage of metal core welding wire is exactly to produce the welding wire that is difficult for the specific alloy composition of production with the form of solid core welding wire.
For traditional overlaying method, no matter be manual electric arc pile up welding, or automatic submerged-arc bead welding, all need manually-operated.And self-protecting metal cored surfacing welding wire because: 1. need not to add protective gas, need not consider the ventilation problem in process of production; 2. weld seam does not have slag, no scarfing cinder problem, uninterruptedly multiple tracks welding continuously in process of production.Therefore, only need the automatic welder(welding machine) welding gun is programmed, control its track route, the full-automation production of just can realize not having artificial intervention, the energy whole day being worked continuously in 24 hours.This will alleviate hand labor intensity greatly, improve built-up welding production, remediation efficiency greatly.
Relevant patent and bibliographical information are not seen in the development of self-protecting metal cored surfacing welding wire at home, abroad as yet.
Summary of the invention
Problem to be solved by this invention is to overcome the problem that exists in the conventional stack soldering method, a kind of high deposition efficiency, low cost is provided, can realizes the high-hardness, wearable, self-protecting metal cored surfacing welding wire of automated job.
A kind of high-hardness, wearable, self-protecting metal cored surfacing welding wire is characterized in that the described metal-cored following substances by mass percent that comprises: 64～77% chromium carbides, 4～8%75
#Ferrosilicon, 5～10% manganese metals, 1～3% almag, 2～5% ferro-borons, 2～6% ferrotianiums, 1～5% ferro-niobium, 1～8% vanadium iron.
Wherein each composition effect and content are as follows:
Chromium carbide: to the weld metal transition alloy elements.The quality percentage composition is: 64～77%.
75
#Ferrosilicon: i.e. FeSi75, wherein contain Si74.0-80.0%, C is 0.1%, Yu Weitie.To weld metal transition alloy elements, deoxidation.The quality percentage composition is: 4～8%.
Manganese metal: to the weld metal transition alloy elements, deoxidation forms protective atmosphere.The quality percentage composition is: 5～10%.
Almag: its composition is an aluminium: magnesium is 3: 2 alloy powder.Deoxidation, denitrogenation.The quality percentage composition is: 1～3%.
Ferro-boron: its composition is 17-19%B, 0.5%C, and 4%Si, 0.5%Al, surplus is Fe.To the weld metal transition alloy elements.The quality percentage composition is: 2～5%.
Ferrotianium: its composition is 25-35%Ti, 8.5%Al, and 5%Si, 2.5%Mn, surplus is Fe.Deoxidation, denitrogenation, crystal grain thinning improves toughness.The quality percentage composition is: 2～6%.
Ferro-niobium: its composition is 70%Nb, 5%Al, and 2.5%Si, surplus is Fe.To the weld metal transition alloy elements.The quality percentage composition is: 1～5%.
Vanadium iron: its composition is 50%V, 0.5%C, and 2%Si, 0.8%Al, surplus is Fe.To the weld metal transition alloy elements.The quality percentage composition is: 1～8%.
Self-protection flux-cored wire is to weld under nothing adds the situation of protective gas.Contain gas-forming agent, slag former and deoxidier etc. in its medicine core.Because do not add the protection of gas, oxygen in welding process in the atmosphere and nitrogen are easy to enter weld seam, finally produce pore.So the pore problem is that the problem that at first runs in the self-shielded welding wire development process also is one of the most scabrous problem.
The present invention is self-protecting metal cored welding wire, no slag making composition in the powder core, its protection mechanism to welding pool is a gas shiled mechanism, the deoxidation protection mechanism, the self-protection mechanism in denitrogenation-fixed nitrogen mechanism and molten bath, below division it:
(1) gas shiled mechanism: contain a certain amount of manganese metal and almag in the welding wire powder core of the present invention; the boiling point of manganese metal relatively low (2335 ℃) under welding arc temperature (3000～5000 ℃), has been evaporated to manganese steam; form protective atmosphere, effectively stop the intrusion of pernicious gas.
(2) deoxidation, protection mechanism: contain ferrosilicon, manganese metal, almag and ferrotianium in the welding wire powder core of the present invention, silicon, manganese, aluminium and titanium are all extremely strong to the affinity of oxygen, very easily generate SiO under hot conditions
2, MnO, Al
2O
3And TiO
2, effectively avoided the intrusion of oxygen to the molten bath.
(3) denitrogenation-fixed nitrogen mechanism: contain alloying element aluminium, boron, titanium, niobium in the welding wire powder core of the present invention, aluminium and nitrogen easily generate AlN, float on weld pool surface and form micro-slag.And alloying element aluminium, boron, titanium, niobium is under the high temperature vigorous reaction in molten bath, all can with nitrogen in conjunction with forming nitride BN, TiN, NbN.These three kinds of nitride extreme hardness, wherein BN-hardness is only second to diamond; TiN-hardness 52Gpa; NbN-hardness 56GPa.Therefore these three kinds of nitride all can be used as the hard phase, and disperse is distributed in the middle of the matrix, and matrix is played invigoration effect.
(4) self-protection mechanism in molten bath: in common flux-cored wire and welding rod, slag former plays the effect that stops gas to be invaded, but also inhibition is played in the effusion of invading gas in advance simultaneously.In metal core welding wire of the present invention; the molten bath does not have slag protection; gas easily enters the molten bath; but just because of weld pool surface does not have the inhibition of slag yet; and the solubility of gas in motlten metal is minimum; in the vigorous reaction process of molten pool metal, gas is easy to overflow from weld pool surface, thereby has avoided the generation of weld porosity.
Component does not have the slag making composition, thus when adopting this metal core welding wire built-up welding, need not scarfing cinder, can realize full-automatic welding.Weld fumes and toxicity thereof are all less.Arc stability, the particle that splashes is little and amount is few, the weld seam pore-free, figuration of bead is attractive in appearance.This welding wire mainly applies to the built-up welding reparation of coal-grinding roller, cement mill, the black groove of steel mill, cold (heat) roll etc.
Preparation method of the present invention adopts prior art, may further comprise the steps:
1, steel band is rolled into U-shaped, in U-lag, adds the powder core of the present invention of the 30-50% that accounts for welding wire gross weight of the present invention again;
2, U-lag is healed up, make powder core parcel wherein,,, make its diameter reach 2.4mm-3.2mm at last, obtain final products by road drawing, tube reducing by wire drawing die.
Description of drawings
Fig. 1: flux-cored wire forming technology schematic diagram
The specific embodiment
All embodiment welding wires are all produced " FCWM50 " flux-cored wire forming machine by the Kunming heavy industry " make:
1. select the H08A cold-rolled strip of 14 * 0.3 (width is 14mm, and thickness is 0.3mm) for use.Earlier it is rolled into U-shaped.Get chromium carbide 64 grams, 75
#Ferrosilicon 5 grams, manganese metal 10 grams, almag 1 gram, ferro-boron 5 grams, ferrotianium 2 grams, ferro-niobium 5 grams, vanadium iron 8 grams.(granularity of the powder of getting is for passing through 40 purpose sieves).The various powder of get are put into mixed powder machine mixed 10 minutes, then mixed-powder is added in the H08A cold-rolled steel trough of belt of U-shaped, filling rate is 30%.U-lag is healed up, make the medicinal powder parcel wherein.Make it by diameter be respectively then: the wire drawing die of 4.2mm, 3.6mm, 3..4mm, 3.15mm, 2.95mm, 2.8mm, 2.6mm, 2.4mm by road drawing, tube reducing, makes its diameter reach 2.4mm at last.Three layers of built-up welding, welding current 320～380A, weldingvoltage 26～30V, speed of welding 25 cm per minute.Interlayer temperature is controlled at 100～200 ℃.Overlay cladding deposited metal hardness and relative wear resistance see Table 1.
2. select the H08A cold-rolled strip of 14 * 0.3 (width is 14mm, and thickness is 0.3mm) for use.Earlier it is rolled into U-shaped.Get chromium carbide 68 grams, 75
#Ferrosilicon 6 grams, manganese metal 7 grams, almag 2 grams, ferro-boron 4 grams, ferrotianium 6 grams, ferro-niobium 1 gram, vanadium iron 6 grams.(granularity of the powder of getting is for passing through 40 purpose sieves).The various powder of get are put into mixed powder machine mixed 10 minutes, then mixed-powder is added in the H08A cold-rolled steel trough of belt of U-shaped, filling rate is 40%.U-lag is healed up, make the medicinal powder parcel wherein.Make it by diameter be respectively then: the wire drawing die of 4.2mm, 3.6mm, 3..4mm, 3.15mm, 2.95mm, 2.8mm, 2.6mm by road drawing, tube reducing, makes its diameter reach 2.6mm at last.Three layers of built-up welding, welding current 320～380A, weldingvoltage 26～30V, speed of welding 30 cm per minute.Interlayer temperature is controlled at 100～200 ℃.Overlay cladding deposited metal hardness and relative wear resistance see Table 1.
3. select the H08A cold-rolled strip of 14 * 0.3 (width is 14mm, and thickness is 0.3mm) for use.Earlier it is rolled into U-shaped.Get chromium carbide 74 grams, 75
#Ferrosilicon 8 grams, manganese metal 6 grams, almag 1 gram, ferro-boron 2 grams, ferrotianium 3 grams, ferro-niobium 2 grams, vanadium iron 4 grams.(granularity of the powder of getting is for passing through 40 purpose sieves).The various powder of get are put into mixed powder machine mixed 10 minutes, then mixed-powder is added in the H08A cold-rolled steel trough of belt of U-shaped, filling rate is 45%.U-lag is healed up, make the medicinal powder parcel wherein.Make it by diameter be respectively then: the wire drawing die of 4.2mm, 3.6mm, 3..4mm, 3.15mm, 3.0mm by road drawing, tube reducing, makes its diameter reach 3.0mm at last.Three layers of built-up welding, welding current 320～380A, weldingvoltage 26～30V, speed of welding 35 cm per minute.Interlayer temperature is controlled at 100～200 ℃.Overlay cladding deposited metal hardness and relative wear resistance see Table 1.
4. select the H08A cold-rolled strip of 14 * 0.3 (width is 14mm, and thickness is 0.3mm) for use.Earlier it is rolled into U-shaped.Get chromium carbide 77 grams, 75
#Ferrosilicon 4 grams, manganese metal 5 grams, almag 3 grams, ferro-boron 3 grams, ferrotianium 4 grams, ferro-niobium 3 grams, vanadium iron 1 gram.(granularity of the powder of getting is for passing through 40 purpose sieves).The various powder of get are put into mixed powder machine mixed 10 minutes, then mixed-powder is added in the H08A cold-rolled steel trough of belt of U-shaped, filling rate is 50%.U-lag is healed up, make the medicinal powder parcel wherein.Make it by diameter be respectively then: the wire drawing die of 4.2mm, 3.6mm, 3..4mm, 3.2mm by road drawing, tube reducing, makes its diameter reach 3.2mm at last.Three layers of built-up welding, welding current 320～380A, weldingvoltage 26～30V, speed of welding 40 cm per minute.Interlayer temperature is controlled at 100～200 ℃.Overlay cladding deposited metal hardness and relative wear resistance see Table 1.
Hardness that table 1 is beaten adopts HR-150A Rockwell hardness machine, and load is 150kg, each overlay cladding is got at 6 beat hardness, obtains the average Rockwell hardness number of this welding wire built-up welding layer at last.
Wear test adopts MLS-225 wear test machine to experimentize.
In overlay cladding, get six 57 * 25 * 5mm wearing and tearing styles, during wear test, test parameters is as follows: the rubber wheel rotating speed: 240 rev/mins, rubber wheel diameter: 178mm, rubber wheel hardness: 60 (Shao Er hardness), load: 10Kg, wearing-in period: 250s, the rubber wheel revolution: about 1000 change abrasive material: 40～70 purpose quartz sands.The anti-wear performance of material is weighed with the weight loss of wearing and tearing.Forward and backward in test, test specimen is put into the beaker that fills acetone soln, in ultrasonic washing instrument, cleaned 3～5 minutes, during experiment with the Q235 steel as a comparison, contrast piece weight loss and measuring piece weight loss liken relative wear resistance to into this style.
The hardness HRC and the relative wear resistance of each embodiment overlay cladding deposited metal of table 1
| Hardness (HRC) | Relative wear resistance (ε) | |
| 1 | 58 | 15.27 |
| 2 | 59.5 | 16.36 |
| 3 | 60.2 | 19.38 |
| 4 | 63 | 20.15 |
Claims (1)
1, a kind of high-hardness, wearable, self-protecting metal cored surfacing welding wire; it is characterized in that; the described metal-cored following substances by mass percent that comprises: 64～77% chromium carbides; 4～8%75# ferrosilicon, 5～10% manganese metals, 1～3% almag; 2～5% ferro-borons; 2～6% ferrotianiums, 1～5% ferro-niobium, 1～8% vanadium iron.
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| CNB2004101015547A CN1304161C (en) | 2004-12-23 | 2004-12-23 | High-hardness, wearable, self-protecting metal cored surfacing welding wire |
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| CNB2004101015547A CN1304161C (en) | 2004-12-23 | 2004-12-23 | High-hardness, wearable, self-protecting metal cored surfacing welding wire |
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| CN1304161C true CN1304161C (en) | 2007-03-14 |
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Cited By (1)
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| CN101406994B (en) * | 2007-10-10 | 2011-01-19 | 中冶集团建筑研究总院 | High-carbon high-chromium high-niobium cast iron self-protecting flux-cored wire |
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| CN1621193A (en) | 2005-06-01 |
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