CN114346517B - High-heat-dissipation high-strength steel gas flux-cored wire for overheat-resistant surfacing - Google Patents
High-heat-dissipation high-strength steel gas flux-cored wire for overheat-resistant surfacing Download PDFInfo
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Abstract
The invention discloses a high-heat-dissipation high-strength steel gas shielded flux-cored welding wire for overheat-resistant surfacing, which comprises a flux core and a welding wire sheath, wherein the welding wire sheath is made of low-carbon steelThe width of the steel belt is 8-12mm, and the thickness is 0.4-1.0mm; the flux-cored part of the welding wire comprises the following components in percentage by mass: mn:1.4-2.4%, C:0.4-0.8%, caF 2 ：0.1–0.6％、BaF 2 ：0.1–0.6％、Ti：0.15–0.3％、Si：0.1–0.25％、SiO 2 ：0.1–0.3％、TiO 2 ：0.1–0.4％、Cr 2 O 3 :0.1-0.2%, la:0.04-0.08%, pr:0.03-0.06%, ce:0.03-0.05%, and the balance of atomized iron powder. According to the invention, the heat dissipation of the welding seam is improved through the balance characteristic of chemical reaction, the average solidification rate of the surface of the molten pool is improved by more than 20% under the condition that the structural performance is not influenced, the volume percentage of overheated tissue is reduced by less than 5%, and the welding wire is ensured to work at higher heat input under the same-level mechanical property requirement.
Description
Technical Field
The invention belongs to the field of metal material processing welding, and particularly relates to a high-heat-dissipation high-strength steel gas shielded flux-cored welding wire for overheat-resistant surfacing.
Background
At present, intelligent welding is gradually popularized in the industrial upgrading stage in China, but in the thick plate welding process, the waiting time of a temperature control system is prolonged in the next welding process due to the gradual accumulation of heat, the working efficiency is reduced, and an overheat structure is easy to form, so that from the material point of view, the problem of heat dissipation of welding solidification of welding materials is particularly important.
The flux-cored wire takes the steel belt as the outer skin, and the inner flux-cored part can be flexibly configured according to engineering requirements, so that the possibility of controlling a welding line solidification heat dissipation system is provided by controlling the proportion of alloy and alloy compounds thereof. In addition, in the welding process, the flux-cored wire has higher current density, so the deposition rate is higher than that of a solid welding wire of the same grade, and the welding process meets the requirement of efficient production of welding.
The control of the interlayer temperature in the process of overlaying high-strength steel is generally realized by a welding process, and the interlayer temperature of a welding material is controlled by the metallurgical characteristic of the welding material.
Disclosure of Invention
The invention provides a high-heat-dissipation high-strength steel gas shielded flux-cored welding wire for overheat-resistant surfacing, which comprises a flux core and a welding wire sheath; the welding wire sheath is a low-carbon steel belt, the width is 8-12mm, and the thickness is 0.4-1.0mm;
the flux-cored part of the welding wire comprises the following components in percentage by mass: mn:1.4-2.4%, C:0.4-0.8%, caF 2 ：0.1–0.6％、BaF 2 ：0.1–0.6％、Ti：0.15–0.3％、Si：0.1–0.25％、SiO 2 ：0.1–0.3％、TiO 2 ：0.1–0.4％、Cr 2 O 3 :0.1-0.2%, la:0.04-0.08%, pr:0.03-0.06%, ce:0.03-0.05%, and the balance of atomized iron powder.
The design idea of the invention is as follows: the alloy elements are easy to generate oxidation reaction in the welding process, the reaction is promoted to be reversely carried out by adding a plurality of oxides corresponding to the alloy elements which are easy to be oxidized into the flux core in advance, the endothermic reaction of losing electrons of metal atoms is reduced, more alloy elements rather than alloy compounds exist in the welding seam finally, and the heat conductivity of the alloy is higher than that of the alloy compounds; additionally added fluoride and SiO 2 The reaction promotes gas phase generation, reduces the temperature of a solidification system, improves the heat dissipation of a welding line by the combined action of the two, quickens the solidification rate of the welding line, shortens the time required for reaching the target interlayer temperature within the same time, and reduces the adverse effect of the solidification rate on toughness by the spheroidization of the inclusion caused by the added rare earth element Re.
Wherein the components act as follows:
SiO 2 : can be combined with CaF 2 And BaF 2 Reacting gaseous SiF 4 Belt with a belt bodyPart of heat in the molten pool is removed to play a role in cooling, and then the heat reacts with hydrogen atoms and water vapor in a gas phase to generate HF gas to play a role in dehydrogenation and cooling.
TiO 2 : on the one hand can be with SiO 2 The grid slag is formed by compounding, which is beneficial to heat dissipation in the solidification process of the welding seam, and on the other hand, because of TiO 2 The presence of (3) may hinder the burning loss of the alloying element Ti.
Cr 2 O 3 : has good high-temperature stability, can be compounded with Pr to form rare earth composite inclusions, promotes the formation of acicular ferrite, and is beneficial to improving the comprehensive mechanical property of the welding seam.
CaF 2 、BaF 2 : helps the weld dehydrogenation and reduces the occurrence rate of hydrogen-induced cracks of the weld.
C: can react with other alloy elements to form carbide, and has the function of solid solution strengthening to weld metal.
Si: plays a role in stabilizing the arc.
Ti: can combine with O to form Ti 2 O 3 In Ti 2 O 3 Cation vacancies are formed around the weld metal matrix, and a large amount of Mn is adsorbed from the weld metal matrix, so that a manganese-deficient area around the inclusions is formed, nucleation of acicular ferrite is promoted, and grains are refined.
Mn: can react with oxygen to deoxidize and react with TiO 2 、SiO 2 And the large particle composite compound is formed by compounding, the specific surface area is increased, and the floating to slag is facilitated to be removed.
Re: the inclusion in the weld joint can be spheroidized to form rare earth composite inclusion, the nucleation of acicular ferrite is promoted, the proeutectoid ferrite can be used as nucleation points of granular bainite and lower bainite, austenite grains are perfectly multi-phase segmented, and the stability of comprehensive mechanical properties of the weld joint under the condition of higher solidification rate is ensured.
Compared with the prior art, the invention has the following beneficial effects: the flux-cored wire has good hydrogen resistance, improves the heat dissipation of a welding line through the balance characteristic of chemical reaction, improves the average solidification rate of the surface of a molten pool by more than 20 percent under the condition of not affecting the structural performance, reduces the volume percentage of overheat tissue by less than 5 percent, has higher heat dissipation performance of weld metal in unit area per unit time, reduces the incidence rate of overheat tissue, and can ensure that the welding wire works under higher heat input under the same-level mechanical property requirement.
Drawings
FIG. 1 is a transition diagram of a weld metal continuous cooling structure in an example.
Detailed Description
The invention provides a high-heat-dissipation high-strength steel gas shielded flux-cored welding wire for overheat-resistant surfacing, wherein the flux-cored part of the welding wire is measured according to the mass percentage: mn:1.4-2.4%, C:0.4-0.8%, caF 2 ：0.1–0.6％、BaF 2 ：0.1–0.6％、Ti：0.15–0.3％、Si：0.1–0.25％、SiO 2 ：0.1–0.3％、TiO 2 ：0.1–0.4％、Cr 2 O 3 :0.1-0.2%, la:0.04-0.08%, pr:0.03-0.06%, ce:0.03-0.05%, and the balance being atomized iron powder; the welding wire sheath is a low-carbon steel strip with the width of 8-12mm and the thickness of 0.4-1.0mm.
In some embodiments, the wire has a diameter of 1.2-1.8mm.
In some embodiments, the fill rate of the flux core in the welding wire is controlled between 20% and 25%.
In some embodiments, the flux-cored portion of the welding wire meets SiO 2 +Si<Mn，TiO 2 +Ti<Mn。
In some embodiments, the flux-cored portion of the welding wire meets the requirement of TiO 2 /SiO 2 <1.2。
In some embodiments, the flux-cored portion of the welding wire meets SiO 2 /(CaF 2 +BaF 2 )<1.5。
In some embodiments, the flux-cored portion of the welding wire is strictly controlled to less than 0.003% impurity element S, P.
In some embodiments, the flux-cored portion of the welding wire satisfies 1% < la+ce+pr <2%.
In some embodiments, the flux-cored portion of the welding wire meets 0.2%<CaF 2 +BaF 2 <1.2％。
In some embodiments, the Mn in the wire is added as electrolytic manganese.
The present invention will be further illustrated by the following specific examples, but the scope of the present invention is not limited to the following examples, and the steel strip compositions used in the following examples are shown in table 1.
Table 1: the mass percent/%of the chemical components of the low-carbon steel-containing belt part
| C | P | S | Si | Mn | N |
| 0.18 | 0.005 | 0.005 | 0.06 | 0.5 | 0.002 |
Example 1
The embodiment provides a high-heat-dissipation high-strength steel gas shielded flux-cored welding wire for anti-overheating overlaying, wherein the flux-cored part of the welding wire is measured according to mass percent: mn:2.4%, C:0.4%, caF 2 ：0.1％、BaF 2 ：0.2％、Ti：0.2％、Si：0.1％、SiO 2 ：0.3％、TiO 2 ：0.36％、Cr 2 O 3 :0.1%, la:0.04%, pr:0.03%, ce:0.03 percent and the balance of atomized iron powder. After the welding wire is rolled into a U-shaped groove according to a common method, the powder core is filled inwards, the filling rate is 22%, and the welding wire is drawn to a diameter of 1.2mm.
Example 2
The embodiment provides a high-heat-dissipation high-strength steel gas shielded flux-cored welding wire for anti-overheating overlaying, wherein the flux-cored part of the welding wire is measured according to mass percent: mn:2.3%, C:0.5%, caF 2 ：0.2％、BaF 2 ：0.1％、Ti：0.2％、Si：0.1％、SiO 2 ：0.3％、TiO 2 ：0.33％、Cr 2 O 3 :0.2%, la:0.04%, pr:0.04%, ce:0.03 percent and the balance of atomized iron powder. After the welding wire is rolled into a U-shaped groove according to a common method, the powder core is filled inwards, the filling rate is 22%, and the welding wire is drawn to a diameter of 1.2mm.
Example 3
The embodiment provides a high-heat-dissipation high-strength steel gas shielded flux-cored welding wire for anti-overheating overlaying, wherein the flux-cored part of the welding wire is measured according to mass percent: mn:2.0%, C:0.4%, caF 2 ：0.15％、BaF 2 ：0.1％、Ti：0.2％、Si：0.15％、SiO 2 ：0.28％、TiO 2 ：0.30％、Cr 2 O 3 :0.1%, la:0.04%, pr:0.04%, ce:0.05% and the balance of atomized iron powder. After the welding wire is rolled into a U-shaped groove according to a common method, the powder core is filled inwards, the filling rate is 22%, and the welding wire is drawn to a diameter of 1.2mm.
Example 4
The embodiment provides a high-heat-dissipation high-strength steel gas shielded flux-cored welding wire for anti-overheating overlaying, wherein the flux-cored part of the welding wire is measured according to mass percent: mn:2.2%, C:0.5%, caF 2 ：0.15％、BaF 2 ：0.15％、Ti：0.2％、Si：0.15％、SiO 2 ：0.24％、TiO 2 ：0.28％、Cr 2 O 3 :0.1%, la:0.03%, pr:0.03%, ce:0.05% and the balance of atomized iron powder. The welding wire is rolled into U according to the common methodAfter the forming groove, the powder core was filled inward with a filling ratio of 25% and drawn to a diameter of 1.6mm.
Example 5
The embodiment provides a high-heat-dissipation high-strength steel gas shielded flux-cored welding wire for anti-overheating overlaying, wherein the flux-cored part of the welding wire is measured according to mass percent: mn:2.4%, C:0.4%, caF 2 ：0.1％、BaF 2 ：0.15％、Ti：0.2％、Si：0.15％、SiO 2 ：0.28％、TiO 2 ：0.30％、Cr 2 O 3 :0.15%, la:0.08%, pr:0.03%, ce:0.03 percent and the balance of atomized iron powder. After the welding wire is rolled into a U-shaped groove according to a common method, the powder core is filled inwards, the filling rate is 25%, and the welding wire is drawn to a diameter of 1.8mm.
The high heat dissipation and high strength steel gas shielded flux-cored wires for anti-overheating overlaying prepared in examples 1-5 and the gas shielded flux-cored wires for overlaying of certain brands of high strength steel in the market of comparative examples 1 and 2 were selected for welding tests. Adopting a direct current reverse connection method, 80 percent Ar+20 percent CO 2 The welding parameters of the gas metal arc welding, base metal 250mm×150mm×20mm Q235 steel plate are shown in Table 2.
The results show that the weld joint structure of the traditional Chinese medicine core welding wire in the embodiment 1-5 is acicular ferrite, granular bainite, lower bainite, martensite and residual austenite, has good complex phase segmentation ratio (shown in figure 1), improves the average solidification rate of the surface of a molten pool by more than 20%, and reduces the volume percentage of the overheat structure by less than 5%. The weld metal has good comprehensive mechanical properties (as shown in Table 3), the hardness can reach more than 60HRC, and meanwhile, the weld metal has good low-temperature impact toughness which can be more than 45J at-40 ℃.
Table 2: flux-cored wire experimental welding parameters
Table 3: weld metal mechanical property comparison table
Although the present invention has been described above, the present invention is not limited to the above-described embodiment, which is merely illustrative and not restrictive, and many modifications may be made by those of ordinary skill in the art without departing from the spirit of the invention, which fall within the protection of the present invention.
Claims (8)
1. The utility model provides a high heat dissipation high strength steel gas shielded flux cored wire for anti-overheating build-up welding which characterized in that, the welding wire includes flux cored and welding wire crust, wherein:
the drug core is measured according to the mass percentage: mn:1.4-2.4%, C:0.4-0.8%, caF 2 ：0.1–0.6%、BaF 2 ：0.1–0.6%、Ti：0.15–0.3%、Si：0.1–0.25%、SiO 2 ：0.1–0.3%、TiO 2 ：0.1–0.4%、Cr 2 O 3 :0.1-0.2%, la:0.04-0.08%, pr:0.03-0.06%, ce:0.03-0.05%, and the balance being atomized iron powder;
the welding wire sheath is a low-carbon steel strip, the width of the steel strip is 8-12mm, and the thickness of the steel strip is 0.4-1.0mm;
the flux core satisfies SiO 2 +Si<Mn，TiO 2 +Ti<Mn，TiO 2 /SiO 2 <1.2。
2. The high heat dissipation and high strength steel gas shielded flux cored wire for anti-overheating weld overlay of claim 1, wherein the flux cored filling rate of the wire is controlled to be 20% -25%.
3. The high heat dissipation and high strength steel gas shielded flux cored wire for anti-overheating weld overlay of claim 1, wherein the flux core satisfies SiO 2 /（CaF 2 +BaF 2 ）<1.5。
4. The high heat dissipation and high strength steel gas shielded flux cored wire for anti-overheating weld overlay according to claim 1, wherein the flux core satisfies an impurity element S, P of 0.003% or less.
5. The high heat dissipation and high strength steel gas shielded flux cored wire for anti-overheating weld overlay according to claim 1, wherein the flux core satisfies 1% < la+ce+pr <2%.
6. The high heat dissipation and high strength steel gas shielded flux cored wire for anti-overheating weld overlay of claim 1, wherein the flux core satisfies 0.2%<CaF 2 +BaF 2 <1.2%。
7. The high heat dissipation and high strength steel gas shield flux cored wire for anti-overheating weld overlay according to claim 1, wherein Mn in the flux core is added in the form of electrolytic manganese.
8. The high heat dissipation and high strength steel gas shielded flux cored wire for anti-overheating weld overlay of claim 1, wherein the wire has a diameter of 1.2-1.8mm.
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| CN202210065484.2A CN114346517B (en) | 2022-01-20 | 2022-01-20 | High-heat-dissipation high-strength steel gas flux-cored wire for overheat-resistant surfacing |
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| US10421160B2 (en) * | 2013-03-11 | 2019-09-24 | The Esab Group, Inc. | Alloying composition for self-shielded FCAW wires with low diffusible hydrogen and high Charpy V-notch impact toughness |
| JP6683505B2 (en) * | 2016-03-08 | 2020-04-22 | 株式会社神戸製鋼所 | Welding method using special torch |
| CN106041363B (en) * | 2016-08-03 | 2019-02-12 | 武汉铁锚焊接材料股份有限公司 | A kind of low temperature unimach flux-cored wire |
| CN107252994A (en) * | 2017-05-12 | 2017-10-17 | 天长市通联焊业有限公司 | A kind of wear-resisting high rigidity flux-cored wire |
| CN110480207B (en) * | 2019-08-21 | 2021-03-16 | 上海工程技术大学 | Flux-cored wire containing composite rare earth elements and suitable for welding 1000 MPa-grade ultrahigh-strength steel |
| CN113579548B (en) * | 2021-07-07 | 2023-07-28 | 四川大西洋焊接材料股份有限公司 | Welding rod, preparation method and application thereof and deposited metal |
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