CN102489901A - Gas protective welding flux cored wire for welding heat resistant steel - Google Patents
Gas protective welding flux cored wire for welding heat resistant steel Download PDFInfo
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- CN102489901A CN102489901A CN2011104077579A CN201110407757A CN102489901A CN 102489901 A CN102489901 A CN 102489901A CN 2011104077579 A CN2011104077579 A CN 2011104077579A CN 201110407757 A CN201110407757 A CN 201110407757A CN 102489901 A CN102489901 A CN 102489901A
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Abstract
The invention belongs to a gas protective welding flux cored wire for welding heat resistant steel. The gas protective welding flux cored wire comprises low-carbon steel metal skin and a flux core, wherein the low-carbon steel metal skin comprises the following components in percentage by weight: 0.01 to 0.1 percent of C, 0.1 to 0.4 percent of Mn, 0.01 to 0.03 percent of Si, 0.005 to 0.015 percent of S, 0.005 to 0.015 percent of P and the balance of iron; the flux core accounts for 14 to 25 percent of the total weight of the welding wire and comprises the following components in percentage by weight: 1.2 to 3.0 percent of medium-carbon ferromanganese, 0.20 to 2.0 percent of ferrosilicon powder, 0.05 to 0.5 percent of magnesium powder, 1.5 to 2.0 percent of metal chromium powder, 0.2 to 2.0 percent of ferromolybdenum powder, 0.05 to 0.2 percent of electrically fused magnesia, 0.01 to 0.3 percent of fluoride and 7 to 15 percent of iron powder; and the components are mixed uniformly, the mixture is coiled on a thin steel strip made of low-carbon steel to form strips, and the strips are drawn to form wires. The gas protective welding flux cored wire has the characteristics of no molten slag on deposited metal after welding, capability of performing continuous multi-layer welding without slag removal, high welding process property, stable electric arcs, small splatter, attractive appearance of weld joints and the like, the welding efficiency is improved by 20 to 40 percent, and vertical downward welding can be realized by short circuiting transfer.
Description
Technical field
The invention belongs to Metal Material Welding production and use welding wire, the gas shielded arc welding flux-cored wire is used in particularly a kind of heat resisting steel welding; This flux-cored wire especially is suitable for operating temperature and is lower than 520 ℃ 15CrMoR class low-alloy container with heat-resistant steel welding and the continuous welding of not scarfing cinder multilayer.
Background technology
The 15CrMoR steel is the pearlite heatproof steel of countries in the world extensive use; Its chemical composition (percentage by weight) is: C:0.12-0.18%, Cr:0.80-1.20%, Mo:0.45-0.60%, Mn:0.40-0.70%, Si:0.15-0.40%, S≤0.010%, P≤0.025%, surplus are iron and unavoidable impurities; Its mechanical property is tensile strength Rm:450-590MPa, yield strength ReL>=275MPa, percentage elongation A>=19%, 20 ℃ kv>=31J; Be the superheater that is used to make high pressure, super-pressure, Subcritical Utility Boiler, the main steel grade that collects case and main steam line, this steel grade welding performance is good.Welding material commonly used has welding rod, solid core welding wire, common flux-cored wire (acid, alkalescence).When adopting the welding rod welding, every root bead bar all will be lost the discard electrode of 20～30mm, can cause the waste of material; And common flux-cored wire is compared with solid welding wire, and under same condition, the deposition rate of flux-cored wire is than the high 20-30% of solid core welding wire; In the patent No. is that 200710185054.X, denomination of invention disclose a kind of with TiO for the patent documentation of " flux-cored wire for gas shielded arc welding for creep-resisting steels "
2Be main Mayari flux-cored wire,, in welding process, can produce a large amount of slags, not only reduced welding efficiency, but also increased welder's labour intensity though this welding wire has toughness characteristics preferably.In order to reduce slag amount in the flux-cored wire welding process; Up to the present; A lot of schemes were proposed, as: be 200680010604.8 in the patent No., denomination of invention for the patent documentation of " preparation method of the high-fatigue strength welding point that metallic flux cored wire and the welding method of using it and the quantity of slag are few " discloses a kind of in the medicine core adding graphitiferous and SiO
2, Al
2O
3, Na
2O and K
2The flux-cored wire of one or more oxides of O; And be 200710166801.5 in the patent No., denomination of invention is a kind of at the metal-cored flux-cored wire that has added oxides such as the ferriferous oxide that contains 0.5-2.5%, Mn oxide for the patent documentation of " flux-cored wire for gas shielded arc welding for creep-resisting steels " discloses; Though the adding of above-mentioned oxide can be played and improve liquidity with the effect of stabilising arc, and can reach the purpose that reduces the slag amount to a certain extent, the slag amount after the welding is still more, need just can carry out the multilayer continuous welding after the scarfing cinder.Thereby this type of patented technology still exists can not realize that continuous multilayer welds, welding efficiency is low, operator's defectives such as labour intensity height.
Summary of the invention
The purpose of this invention is to provide a kind of heat resisting steel welding and use the gas shielded arc welding flux-cored wire; Be used for the welding job temperature and be lower than 520 ℃ 15CrMoR class low-alloy container with heat-resistant steel welding and the continuous welding of not scarfing cinder multilayer; To reach effective reduction welding back slag, can carry out the welding of not scarfing cinder continuous multilayer, effectively improve weld seam overall performance and welding efficiency; And welding technological properties is good, arc stability, splash little, appearance of weld is attractive in appearance, and also can realize purpose such as upright welding downwards through short circuiting transfer.
The solution of flux-cored wire of the present invention is that the metal sheath of welding wire adopts that to contain C 0.01-0.1wt%, Mn 0.1-0.4wt%, Si 0.01-0.03wt%, S 0.005-0.015wt%, P 0.005-0.015wt%, surplus be the metal sheath of the mild steel (strip steel) of iron as welding wire; In its medicine core each composition with the weight percent meter of whole welding wires, be respectively: medium carbon manganese iron powder 1.2-3.0wt%, ferrosilicon powder 0.20-2.0wt%, magnesium (Mg) powder 0.05-0.5wt%, crome metal (Cr) powder 1.5-2.0wt%, molybdenum-iron powder 0.2-2.0wt%, fused magnesite 0.05-0.2wt%, fluoride 0.01-0.3wt%, iron powder 7-15wt%; Each composition in the medicine core is mixed the back, places as on the thin steel band of the low-carbon (LC) of welding wire crust, roll (parcel) slivering and be pulled to into the silk of requirement diameter.
The content of above-mentioned flux-cored wire Chinese medicine core accounts for the 14-25wt% of whole welding wire weight, the diameter of medicine core is Φ 1.0-3.0mm.The ratio of Mn and Si is 3-8 in the said flux-cored wire.Said fluoride is one or more in calcirm-fluoride, sodium fluoride, potassium fluotitanate and the oryolite.And in the deposited metal after the flux-cored wire according to the invention welding diffusible hydrogen content less than 4mL/100g.
The main effect of each composition is following in the medicine core of the present invention:
Mid-carbon fe-mn: manganese is important deoxidier, also is the important alloying constituent of weld metal simultaneously.The intensity and the toughness of butt welded seam metal have material impact.Manganese can reduce austenite to the ferritic transformation temperature, promotes AF (pin is strengthened ferrite) to form; The increase of manganese content can improve the low-temperature impact toughness of weld seam, but then opposite when too high, in addition, manganese can also form MnS with sulphur, reduces the impurity content of weld seam.
Ferrosilicon: silicon is that important deoxidier also is the important alloying constituent of weld metal simultaneously, and silicon can reduce the oxygen content of weld metal, improves the impact flexibility of weld metal, but then opposite when too high; Adopt its effect of silicomanganese combined deoxidation better.
The magnesium powder: magnesium is strong deoxidier, and the oxygen content of controlling weld metal is had important function, can also play the effect of stabilising arc simultaneously; But can increase weld fumes during too high levels, in welder's unhealthy profit.
Crome metal: chromium is heat resisting steel alloying component commonly used, and chromium can play the effect of crystal grain thinning in alloy, in all metal carbides, the carbide of chromium is the most tiny a kind of, and can be evenly distributed in the steel body; The effect of the grain growth of obstruction is arranged under the high heat condition of short time, thereby can reduce weld seam (deposited metal) overheated sensitlzing effect (property).
Molybdenum-iron: molybdenum can significantly improve the intensity of weld metal, and the effect of crystal grain thinning is also arranged, and can reduce the overheated tendentiousness and the temper brittleness of weld metal, and suitable molybdenum-iron addition can improve intensity, hardness and the heat endurance of weld seam; But too highly then can influence weld metal toughness.
Fused magnesite: be used to improve appearance of weld, increase slag basicity, improve the low-temperature flexibility of weld seam, the gas permeability of slag is had certain help.
Fluoride: the present invention selects one or more in calcirm-fluoride, sodium fluoride, potassium fluotitanate and the oryolite for use, in order to reduce the content of diffusible hydrogen in the deposited metal; But content of fluoride is too high, and electric arc is unstable during welding, splashing becomes big, electric arc sound variation.
Iron powder: add the core that is used as medicine in the medicine core and can improve welding efficiency and provide a spot of oxygen to be used for stabilising arc, in order to guarantee high deposition efficiency.
Thereby the present invention promptly cooperates through organic assembly of above-mentioned drug core component and with the mild steel crust and realizes its goal of the invention.
After adopting welding wire of the present invention that 15CrMoR class low-alloy container is welded with heat resisting steel; Tensile strength >=the 550MPa of its deposited metal, yield strength >=470MPa, percentage elongation >=19%, normal temperature impact and reach 90J, and the deposited metal diffusible hydrogen content is less than 4mL/100g; Improved the weld seam overall performance effectively, welding efficiency improves 20-40%, and the integrated cost of welding wire production and use is low.Thereby tool of the present invention can reduce significantly and almost not have slag on slag amount after (elimination) welding, the welding back deposited metal and exist, and can carry out the welding of not scarfing cinder continuous multilayer, effectively improved the overall performance and the welding efficiency of weld seam; And welding technological properties is good, arc stability, splash little, appearance of weld is attractive in appearance, and also can realize characteristics such as upright welding downwards through short circuiting transfer.
The specific embodiment
Embodiment 1: adopt the crust of the steel band of (wide * thick) 14 * 0.9mm as welding wire, its chemical composition is that C 0.04wt%, Mn 0.25wt%, Si 0.015wt%, S 0.01wt%, P 0.01wt%, surplus are iron; Producing the 100Kg welding wire with preparation is example; Present embodiment medicine core accounts for the heavy 15wt% of whole welding wire, and each composition is in the medicine core: mid-carbon fe-mn 2.4Kg, ferrosilicon powder 1.0Kg, magnesium (Mg) powder 0.2Kg, crome metal (Cr) powder 1.5Kg, molybdenum-iron powder 0.9Kg, fused magnesite 0.1Kg, calcirm-fluoride 0.2Kg, add iron powder 8.7Kg to medicine core batching gross weight 15Kg; For use after then each composition in the medicine core being mixed;
Steel band is placed in the welding wire make-up machine, medicine core compound for use is injected laterally be bent in the steel band groove of " U " type successively, so roll slivering, again through the silk that is pulled to Φ 1.2mm.
Present embodiment is at welding parameter: I=250-260A, U=28-30V, gas flow 20L/min, 80%Ar+ surplus CO
2, the 15CrMoR steel to be welded, the post weld heat treatment ginseng is: 620 ℃, permanent (guarantor) warm 1h; Its:
Deposited metal composition (%)
| C | Mn | Si | S | P | Cr | Mo |
| 0.07 | 0.9 | 0.4 | 0.007 | 0.010 | 1.15 | 0.45 |
Deposited metal mechanical performance (mist):
Diffusible hydrogen content: 3.2mL/100g.
Embodiment 2: the crust of welding wire is identical with embodiment 1; Producing the 100Kg welding wire with preparation is example; Present embodiment medicine core accounts for the heavy 20wt% of whole welding wire, and each composition is in the medicine core: mid-carbon fe-mn 2.4Kg, ferrosilicon powder 1.0Kg, magnesium (Mg) powder 0.2Kg, crome metal (Cr) powder 1.5Kg, molybdenum-iron powder 0.9Kg, fused magnesite 0.1Kg, calcirm-fluoride and potassium fluotitanate 0.2Kg (each 0.1Kg), add iron powder 13.7Kg to medicine core batching gross weight 20Kg; All the other are identical with embodiment 1, its:
Deposited metal composition (%)
| C | Mn | Si | S | P | Cr | Mo |
| 0.07 | 0.9 | 0.3 | 0.007 | 0.010 | 1.15 | 0.45 |
Deposited metal mechanical performance (mist):
Diffusible hydrogen content: 3.6mL/100g.
The crust of embodiment 3. welding wires is identical with embodiment 1; Producing the 100Kg welding wire with preparation is example; Present embodiment medicine core accounts for the heavy 20wt% of whole welding wire, and each composition is in the medicine core: mid-carbon fe-mn 2.4Kg, ferrosilicon powder 1.0Kg, magnesium (Mg) powder 0.2Kg, crome metal (Cr) powder 1.5Kg, molybdenum-iron powder 0.9Kg, fused magnesite 0.1Kg, sodium fluoride and potassium fluotitanate 0.24Kg (each 0.12Kg), add iron powder 13.66Kg to medicine core batching gross weight 20Kg.For use after then each composition in the medicine core being mixed;
Steel band is placed in the welding wire make-up machine, medicine core compound for use is injected laterally be bent in the steel band groove of " U " type successively, so roll slivering, through the silk that is pulled to Φ 2.0mm.
Present embodiment is at welding parameter: I=350-360A, U=30-31V, gas flow 25L/min, 80%Ar+ surplus CO
2, the 15CrMoR steel to be welded, the post weld heat treatment ginseng is: 620 ℃, permanent (guarantor) warm 1h; Its:
Deposited metal composition (%)
| C | Mn | Si | S | P | Cr | Mo |
| 0.04 | 0.9 | 0.4 | 0.007 | 0.010 | 1.15 | 0.45 |
Deposited metal mechanical performance (mist):
Diffusible hydrogen content: 3.5mL/100g.
Claims (5)
- Heat resisting steel welding with the gas shielded arc welding flux-cored wire, comprise metal sheath and be located at the medicine core of outer intracutaneous, it is characterized in that it is the metal sheath of the mild steel of iron as welding wire that the metal sheath employing contains C 0.01-0.1wt%, Mn 0.1-0.4wt%, Si 0.01-0.03wt%, S 0.005-0.015wt%, P 0.005-0.015wt%, surplus; In its medicine core each composition with the weight percent meter of whole welding wires, be respectively: medium carbon manganese iron powder 1.2-3.0wt%, ferrosilicon powder 0.20-2.0wt%, magnesium powder 0.05-0.5wt%, hafnium metal powfer 1.5-2.0wt%, molybdenum-iron powder 0.2-2.0wt%, fused magnesite 0.05-0.2wt%, fluoride 0.01-0.3wt%, iron powder 7-15wt%; Each composition in the medicine core is mixed the back, places as on the thin steel band of the mild steel of welding wire crust, roll slivering and be pulled to into the silk of requirement diameter.
- 2. use the gas shielded arc welding flux-cored wire by the welding of the said heat resisting steel of claim 1, it is characterized in that the diameter that the content of said flux-cored wire Chinese medicine core accounts for the 14-25wt% of whole welding wire weight, medicine core is Φ 1.0-3.0mm.
- 3. use the gas shielded arc welding flux-cored wire by the welding of the said heat resisting steel of claim 1, it is characterized in that the ratio of Mn and Si is 3-8 in the said flux-cored wire.
- 4. use the gas shielded arc welding flux-cored wire by the said heat resisting steel welding of claim 1, it is characterized in that said fluoride is one or more in calcirm-fluoride, sodium fluoride, potassium fluotitanate and the oryolite.
- 5. use the gas shielded arc welding flux-cored wire by the said heat resisting steel welding of claim 1, it is characterized in that diffusible hydrogen content is less than 4mL/100g in the deposited metal after said flux-cored wire welds.
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| CN2011104077579A CN102489901B (en) | 2011-12-09 | 2011-12-09 | Gas protective welding flux cored wire for welding heat resistant steel |
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| CN102489901B CN102489901B (en) | 2013-12-04 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103551758A (en) * | 2013-10-11 | 2014-02-05 | 四川大西洋焊接材料股份有限公司 | High-toughness metal powder type flux-cored wire for nuclear power projects |
| CN104148824A (en) * | 2014-09-01 | 2014-11-19 | 四川大西洋焊接材料股份有限公司 | High-tenacity flux-cored wire for electro-gas welding |
| CN106624450A (en) * | 2017-02-08 | 2017-05-10 | 四川大西洋焊接材料股份有限公司 | Ultra-supercritical heat-resistant steel flux-cored wire and preparation method thereof |
| CN107717257A (en) * | 2017-11-27 | 2018-02-23 | 四川大西洋焊接材料股份有限公司 | Supporting flux-cored wire of ultra supercritical heat resisting steel and preparation method thereof |
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| CN107717257A (en) * | 2017-11-27 | 2018-02-23 | 四川大西洋焊接材料股份有限公司 | Supporting flux-cored wire of ultra supercritical heat resisting steel and preparation method thereof |
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| CN102489901B (en) | 2013-12-04 |
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