CN102873475B - Acidic CO2 flux-cored wire with ultralow hydrogen content and high toughness and preparation thereof - Google Patents
Acidic CO2 flux-cored wire with ultralow hydrogen content and high toughness and preparation thereof Download PDFInfo
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- CN102873475B CN102873475B CN201210345850.6A CN201210345850A CN102873475B CN 102873475 B CN102873475 B CN 102873475B CN 201210345850 A CN201210345850 A CN 201210345850A CN 102873475 B CN102873475 B CN 102873475B
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Abstract
The invention relates to an acidic CO2 flux-cored wire with ultralow hydrogen content and high toughness and preparation thereof. The flux-cored wire is used for bridge steel and consists of a carbon steel strip serving as a skin, and a medicinal core, wherein the medicinal core comprises the following main components in percentage by weight: 42 to 45 percent of TiO2, 2.5 to 3 percent of NaF, 4 to 6 percent of SiO2, 16 to 18 percent of Si-Mn, 3 to 5 percent of Al-Mg, 3 to 4 percent of MgO, 0.5 to 1 percent of ReF, 2 to 3 percent of ZrO2, 1 to 3 percent of Ti-Fe, 1.5 to 3 percent of Al-Fe, 2 to 3 percent of B-Fe and the balance of iron powder. The wire is subjected to on-line high-frequency heating and baking during preparation; and the flux-cored wire is simply, efficiently and controllably produced in batches and has high moisture absorption resistance, and high cold crack resistance during welding, deposited metal has the characteristics of high toughness and ultralow hydrogen content, all-position welding can be performed, a weld joint is high in slag coverage and slag detachability and small in welding spatter and has attractive appearance, and the flux-cored wire is suitable for welding bridge steel of grade 50kg in highly cold and highly humid severe environment and the like.
Description
Technical field
The invention belongs to technical field of welding materials, be specifically related to the acid CO of ultralow-hydrogen low high tenacity for a kind of bridge steel
2flux-cored wire and preparation thereof.
Background technology
Along with the development of solder technology, flux-cored wire is high with its production efficiency, processing performance good, welding quality is excellent, appearance of weld is attractive in appearance, simple to operate, easily realize the advantage such as automated and semi-automatic and in shipbuilding industry, obtained application very widely.Flux-cored wire is divided into " seamless " and " seamed " two kinds by joint close shape, seamless flux-cored wire manufacturing process is more complicated, seamed cored wire manufacturing process is simpler, adopt more general at home and abroad, but due to common seamed cored wire in process of production or place after a period of time medicine core all easily by the joint close gap moisture absorption, cause in welding process deposited metal diffusible hydrogen content higher, under the adverse circumstances such as high and cold, high humidity, easily occur a large amount of fatal cold crack defects during bridge steel welding.In addition, common solder wire with acidity core diffusible hydrogen content also higher, cracking resistance and low-temperature impact toughness poor, and although alkaline flux-cored wire diffusible hydrogen content is lower, welding technological properties is poor, flux-cored wire being widely used at Bridges in Our Country steel welding field of cannot having realized these a series of effects limit such as all-position welding.Existing published patent is all to reduce the diffusible hydrogen content of flux-cored wire deposited metal by adjusting medicine core component, although utilize these methods under certain conditions diffusible hydrogen content to be decreased, for seamed acid CO
2flux-cored wire will realize ultralow-hydrogen low content and prevent in process of production, in use procedure and to place medicine wicking tide after a period of time be very difficult.
Summary of the invention
Solve above-mentioned existing problem, proposed a kind of bridge steel seamed acid CO2 flux-cored wire of ultralow-hydrogen low high tenacity and preparation method thereof.The present invention is mainly by adjusting the component of medicine core and in preparation process, welding wire being carried out to the method that high-frequency heating is cured, and the concrete scheme of taking is as follows.
The acid CO of ultralow-hydrogen low high tenacity for described bridge steel
2flux-cored wire, is comprised of steel band and medicine core, it is characterized in that, described steel band adopts the steel band of low-carbon (LC) and low impurity content, by acid slag system medicine core, is filled, and the key component of described medicine core and percentage by weight are: TiO
242%～45%, NaF 2.5%～3%, SiO
24%～6%, Si-Mn 16%～18%, and Al-Mg 3%～5%, and MgO 3%～4%, and ReF 0.5%～1%, ZrO
22%～3%, Ti-Fe 1%～3%, and Al-Fe 1.5%～3%, and B-Fe 2%～3%, and surplus is metal iron powder.
As preferably, the component of described medicine core and percentage by weight are: TiO
2: 42%, NaF:2.5%, SiO
2: 4%, Si-Mn:18%, Al-Mg:3%, MgO:4%, ReF:0.5%, ZrO
2: 2%, Ti-Fe:3%, Al-Fe:3%, B-Fe:3%, metal iron powder: 15%.
As preferably, the component of described medicine core and percentage by weight are: TiO
2: 45%, NaF:3%, SiO
2: 6%, Si-Mn:16%, Al-Mg:5%, MgO:3%, ReF:1%, ZrO
2: 3%, Ti-Fe:1%, Al-Fe:1.5%, B-Fe:2%, metal iron powder: 13.5%.
Further, the filling rate of described medicine core is 14%～15%.
Further, described flux-cored wire is seamed cored wire.
The acid CO of ultralow-hydrogen low high tenacity for described bridge steel
2the preparation method of flux-cored wire, comprises general manufacturing process in flux-cored wire production industry, and as the step of moulding, rolling tube reducing, the step of drawing, glomerocryst mould tube reducing, is characterized in that: also comprise that online high-frequency heating cures the step of processing.
Further, the step that described high-frequency heating is cured processing is, when flux-cored wire is drawn to diameter and is Φ 1.2mm, by online thermatron, welding wire is cured, the drawing speed of flux-cored wire is 6m/s, the frequency of high frequency electric source is 4～6KHz, and instantaneous stoving temperature is 350 ℃～500 ℃.
Further, described online high-frequency heating curing range, comprises hollow ceramic pipe, and is wound in the spiral-shaped inductance coil on earthenware.
Further, the spiral-shaped inductance coil being wound in described on earthenware is made by red copper.
Further, described online high-frequency heating curing range, the outside dimension of its earthenware is Φ 100 ± 6mm, and internal diameter size is Φ 80 ± 5mm, and length dimension is 1000 ± 30mm, and the outside dimension of its inductance coil is Φ 30 ± 5mm.
The operation principle of each component of medicine core of the present invention:
TiO
2be a kind of main component of medicine core, contribute to improve the arc stability of flux-cored wire, the fusing point of capable of regulating slag and viscosity.Form with rutile in the present invention adds, when addition is lower than 42% time, and the vertical weldering downwards of flux-cored wire welding technological properties variation, when addition surpasses 45%, deposited metal oxygen content increases, and reduces weld seam low-temperature impact toughness.
NaF is one of dehydrogenation material in medicine core, has played gas-forming agent effect in welding process, is conducive to reduce the dividing potential drop of hydrogen in arc atmosphere, thereby plays the effect of dehydrogenation, is also conducive to improve the spreadability of slag.ReF is also one of main dehydrogenation material in medicine core, also has the effect that improves low-temperature impact toughness, and the form with rare earth fluoride in the present invention adds, and its addition is 0.5%～1%.
SiO
2be acidic oxide main in medicine core, contribute to reduce slag basicity, refinement molten drop, reduce and splash, improve processing performance.In the present invention, with quartzy form, add, when addition is lower than 4% time, be unfavorable for de-slag, improvement effect to processing performance is not obvious, when addition surpasses 6%, easily makes weld seam occur impression defect, splashing, it is remarkable to increase explosive sound, reduces weld seam low-temperature impact toughness simultaneously.
MgO adds in order to adjust the basicity of slag a kind of basic anhydride of putting, and contribute to slag making and improve the gas permeability of slag, and capable of regulating slag fusing point, viscosity etc., can improve slag and cover and appearance of weld.Form with magnesia in the present invention adds, when addition is lower than 3% time, and the less stable of electric arc, the increase of splashing, when addition surpasses 4%, welding slag covers poor, has a strong impact on the shaping of weld seam.
A1-Mg alloy is a kind of active metal, A1, and Mg belongs to strong deoxidier, for the oxygen content that reduces weld seam, plays an important role, and the while is also conducive to stable arc and minimizing is splashed.When content increases, can increase the deflection of electric arc, but be unfavorable for appearance of weld.If A1 in weld seam, the remaining too high levels of Mg, can make weld strength too high, is also unfavorable for the low-temperature impact toughness of weld seam.
ZrO
2add the deslag performance that contributes to improve flux-cored wire, the form with zircon sand in the present invention adds, its addition is 2%～3%.
Adding of metal iron powder contributes to improve medicine core melting conditions, is conducive to improve the processing performance of welding wire, splashes etc. as improved arc stability, reducing.Add iron powder can also increase welding wire deposition rate, improve welding wire deposition efficiency.In order to guarantee the mechanical property of flux-cored wire deposited metal, particularly intensity and low-temperature impact toughness, the present invention also adds multiple ferroalloy in medicine core, as ferrotianium, ferro-boron, ferro-aluminum, silicomangan etc., mainly as deoxidier and alloying constituent, uses.The pure metal powder simultaneously adding also has manganese metal except metal iron powder, mainly as alloying constituent, uses.
Feature of the present invention and advantage:
The seamed CO of acidity of ultralow-hydrogen low high tenacity of the present invention
2flux-cored wire, cures processing by online high-frequency heating, and that this processing method has is energy-efficient, environmental protection, safe and reliable, simple operation and other advantages.Simple during batch production, efficient, controlled, can effectively prevent in process of production and the moisture absorption of placing medicine core after a period of time thering is good anti-moisture absorption performance.Adopt CO
2as protective gas; while welding, there is good anti-cold crack performance under high humidity environment; deposited metal has high tenacity (low-temperature impact toughness is more than 140J at-20 ℃), ultralow-hydrogen low (mercury process test diffusible hydrogen [H] <4mL/100g), can put down, stand, horizontal, face upward etc. full position all-position welding, weld seam slag spreadability good, take off that slag is easy, spatter is little, appearance of weld is attractive in appearance.Be very suitable for the welding of 50kg level bridge steel under the adverse circumstances such as high and cold, high humidity.
Accompanying drawing explanation
Fig. 1 is flux-cored wire operation of rolling schematic diagram.
Fig. 2 is flux-cored wire drawing process schematic diagram.
Fig. 3 is that the online high-frequency heating of flux-cored wire is cured Principle of Process figure.
Fig. 4 is the online high-frequency heating curing range of flux-cored wire generalized section.
Wherein: 1, paying out machine; 2, intermediate tension machine; 3, lower medicinal powder device; 4, medicinal powder attemperator; 5, welding wire forming machine; 6, roller die; 7, welding wire roll mill; 8, admission machine; 9, glomerocryst mould; 10, drawing welding wire machine; 11, high-frequency heating curing range; 12, Φ 1.2mm flux-cored wire; 13, earthenware; 14, induction copper coil.
The specific embodiment
Below in conjunction with accompanying drawing, describe embodiments of the present invention in detail.
As depicted in figs. 1 and 2, the preparation were established of flux-cored wire in the present invention: steel band → rewinding → Ultrasonic Cleaning → oven dry → take-up; Paying out machine is put and is with → rolls ∪ shape groove → lower powder device to add powder → moulding → rolling tube reducing (rough) → take-up; Cure → the take-up of unwrapping wire → drawing (finish draw) → glomerocryst mould tube reducing → high-frequency heating; Unwrapping wire → alignment → layer, around → packing → warehouse-in, obtains the acid CO of ultralow-hydrogen low high tenacity
2flux-cored wire.
As shown in Figure 2, the preparation of flux-cored wire in the present invention, except adopting the interior general manufacturing process of flux-cored wire production industry, has also invented a kind of method that the online high-frequency heating of flux-cored wire is cured and has prevented medicine wicking tide.In flux-cored wire batch production process, when flux-cored wire is drawn to diameter and is Φ 1.2mm, by online thermatron, welding wire is cured, the drawing speed of flux-cored wire is 6m/s, the frequency of high frequency electric source is 4～6KHz, instantaneous stoving temperature is 350 ℃～500 ℃, can effectively remove flux-cored wire surface lubricant of being with in drawing process, cure the moisture that in flux-cored wire, medicine core absorbs, solve a seamed cored wire difficult problem for the easy moisture absorption in process of production, effectively reduced diffusible hydrogen content.
The principle that flux-cored wire high-frequency heating is cured: when flux-cored wire is in a high-frequency alternating electric field, known according to Faraday's electromagnetic induction law and Joule-Lenz's law, while having electric current to pass through flux-cored wire, at it, just produce magnetic field around simultaneously, high frequency electric flows in the spiral-shaped inductance coil of being made by red copper, the strong flux of polarization instantaneous variation in coil thus, flux will connect whole flux-cored wire, the direction inner contrary with heating current at flux-cored wire produces very large eddy current, alternating magnetic field is by the electric current trend surface circulation making in flux-cored wire, cause kelvin effect, the density of immediate current is directly proportional to frequency, frequency is higher, induced current density concentrates on the surface of flux-cored wire, be that kelvin effect is just more serious, effectively conductive area reduces, resistance increases, make the temperature of flux-cored wire integral body increase rapidly, thereby complete, the hot baked that adds of flux-cored wire is processed.
By specific embodiment, the present invention is further illustrated:
Table 1 medicine core component and percentage by weight thereof (%)
In above-described embodiment, the medicine core filling rate of flux-cored wire is 14%～15%.
Table 2 flux-cored wire high-frequency heating is cured parameter
The flux-cored wire that the different medicine core components of table 3 and the mode of curing form
The acid CO of ultralow-hydrogen low high tenacity of the present invention
2flux-cored wire performance test:
Flux-cored wire chemical composition, mechanical property, anti-moisture absorption performance and the diffusible hydrogen test result by standard-required and industry conventional method test implementation example 1-4, prepared are as table 4-7.
Table 4 deposited metal composition (%)
Table 5 deposited metal mechanical property
The contrast of table 6 flux-cored wire anti-moisture absorption performance
Table 7 deposited metal diffusible hydrogen content (mercury process)
Above-described embodiment is the preferred embodiment for absolutely proving that the present invention enumerates only, and protection scope of the present invention is not limited to this.Should be understood to, being equal to that those skilled in the art do on basis of the present invention substitutes or conversion, all within protection scope of the present invention.
Claims (5)
1. the acid CO of ultralow-hydrogen low high tenacity for a bridge steel
2flux-cored wire, is comprised of steel band and medicine core, it is characterized in that, described steel band adopts the steel band of low-carbon (LC) and low impurity content, and the key component of described medicine core and percentage by weight are: TiO
242%～45%, NaF 2.5%～3%, SiO
24%～6%, Si-Mn 16%～18%, and Al-Mg 3%～5%, and MgO 3%～4%, and ReF 0.5%～1%, ZrO
22%～3%, Ti-Fe 1%～3%, and Al-Fe 1.5%～3%, and B-Fe 2%～3%, and surplus is metal iron powder.
2. the acid CO of ultralow-hydrogen low high tenacity for bridge steel according to claim 1
2flux-cored wire, is characterized in that, the component of described medicine core and percentage by weight are: TiO
2: 42%, NaF:2.5%, SiO
2: 4%, Si-Mn:18%, Al-Mg:3%, MgO:4%, ReF:0.5%, ZrO
2: 2%, Ti-Fe:3%, Al-Fe:3%, B-Fe:3%, metal iron powder: 15%.
3. the acid CO of ultralow-hydrogen low high tenacity for bridge steel according to claim 1
2flux-cored wire, is characterized in that, the component of described medicine core and percentage by weight are: TiO
2: 45%, NaF:3%, SiO
2: 6%, Si-Mn:16%, Al-Mg:5%, MgO:3%, ReF:1%, ZrO
2: 3%, Ti-Fe:1%, Al-Fe:1.5%, B-Fe:2%, metal iron powder: 13.5%.
4. according to the bridge steel described in claim 1～3 any one, use the acid CO of ultralow-hydrogen low high tenacity
2flux-cored wire, is characterized in that, the filling rate of described medicine core is 14%～15%.
5. according to the bridge steel described in claim 1～3 any one, use the acid CO of ultralow-hydrogen low high tenacity
2flux-cored wire, is characterized in that, described flux-cored wire is seamed cored wire.
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| CN201210345850.6A CN102873475B (en) | 2012-09-18 | 2012-09-18 | Acidic CO2 flux-cored wire with ultralow hydrogen content and high toughness and preparation thereof |
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|---|---|---|---|
| CN201210345850.6A CN102873475B (en) | 2012-09-18 | 2012-09-18 | Acidic CO2 flux-cored wire with ultralow hydrogen content and high toughness and preparation thereof |
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| CN102873475A CN102873475A (en) | 2013-01-16 |
| CN102873475B true CN102873475B (en) | 2014-10-01 |
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| CN103192202B (en) * | 2013-04-22 | 2016-04-27 | 南京钢铁股份有限公司 | A kind of high tenacity corrosion resistant all positon gas shielded flux-cored wire used for welding |
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| CN111347194B (en) * | 2020-04-28 | 2022-03-04 | 天津市永昌焊丝有限公司 | Production method of ultralow-hydrogen flux-cored wire |
| CN111702371A (en) * | 2020-06-28 | 2020-09-25 | 昆山京群焊材科技有限公司 | Ultralow-hydrogen acidic flux-cored wire and production method thereof |
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