CN106141492A - A kind of welding wire - Google Patents
A kind of welding wire Download PDFInfo
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- CN106141492A CN106141492A CN201510197930.5A CN201510197930A CN106141492A CN 106141492 A CN106141492 A CN 106141492A CN 201510197930 A CN201510197930 A CN 201510197930A CN 106141492 A CN106141492 A CN 106141492A
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Abstract
The invention discloses a kind of a kind of welding wire with good comprehensive mechanical property, soldering wire alloy system uses Mn2-Ni2-Cr-Mo system, the component of alloy and percentage by weight be: C≤0.10%, Mn:1.4-2.0%, Si:0.4-0.9%, Ni:1.8-2.1%, Mo:0.3-0.5%, Cr:0.2-0.6%, microalloy: Ti≤0.020%, Zr≤0.020%, remaining is ferrum.The welding wire deposited metal yield strength of present invention design is more than 890MPa, in order to make welding wire while ensureing that deposited metal has higher-strength, also there is good plasticity and low temperature impact properties, the major alloy system of welding wire uses Mn2-Ni2-Cr-Mo system, and adds a certain amount of micro alloying element Ti and Zr.Ensure that deposited metal not only has higher intensity, and there is good plasticity and low-temperature flexibility, it is ensured that under relatively low or suitable preheating temperature conditions, ensure the cold-crack resistance energy of weld metal.
Description
Technical field
The invention belongs to welding wire research and development field, particularly relate to the composition design of a kind of welding wire.
Background technology
For ensureing the welded safety in utilization of high strength steel and reliability, improve the service life of product, avoid the generation of brittle break accident, the emphasis of solder technologist's research work it is always by the obdurability selecting high-quality welding material to improve weld metal, Strengthening and Toughening problem around low-alloy high-strength steel weld metal, solder technologist has carried out lot of experiments research both at home and abroad, for the yield strength weld metal less than 550MPa, Ti-B microalloying can be used, weld metal is made to obtain uniformly, tiny acicular ferrite structure, thus realize the Strengthening and Toughening of weld metal；And for the yield strength weld metal more than 550MPa, increasing due to welding seam alloying degree, the matrix of weld metal is not the most ferrite, but bainite or bainite+martensitic structure, the mechanism of Ti-B microalloying is the most inapplicable, the now Strengthening and Toughening measure of Resistance of Weld Metal is to increase Ni content, is realized bainite or the Strengthening and Toughening of bainite+martensitic matrix tissue by alloying.
According to statistics, on current wlding market, yield strength 345MPa level (50 feather weight) welding wire uses C-Mn or C-Mn-Ti-B alloy system；460MPa level (60 kg class) welding wire majority uses Mn-Mo alloy system；550 and 690 MPa levels (70,80 feather weight) welding wire, most employing Mn-Ni-Mo alloy systems；And the other welding wire of strength grade 780MPa higher level, alloy system mainly has Mn-Ni-Cr-Mo, Mn-Ni-Cr-Mo-Cu alloy system.For yield strength 700 MPa level high-strength steel welding material, the alloy system of employing is based on Mn-Ni-Mo alloy system, and Ni content therein is more than 2.5%, Mo content more than 0.7%, and Ni belongs to noble metal, and too much adding to increase welding wire cost.
Summary of the invention
In order to solve the problems referred to above, the invention provides a kind of a kind of welding wire with good comprehensive mechanical property.
According to an aspect of the present invention, providing a kind of welding wire, soldering wire alloy system uses Mn2-Ni2-Cr-Mo system, and the component of alloy and percentage by weight be: C≤0.10%, Mn:1.4-2.0%, Si:0.4-0.9%, Ni:1.8-2.1%, Mo:0.3-0.5%, Cr:0.2-0.6%, microalloy: Ti≤0.020%, Zr≤0.020%, remaining is ferrum.The welding wire deposited metal yield strength of present invention design is more than 890MPa, in order to make welding wire while ensureing that deposited metal has higher-strength, also there is good plasticity and low temperature impact properties, the major alloy system of welding wire uses Mn2-Ni2-Cr-Mo system, and adds a certain amount of micro alloying element Ti and Zr.
C can significantly improve weld strength, is the essential element of weld metal strengthening, but if C content is too high, not only reduces the plasticity and toughness of weld metal, but also dramatically increase cold cracking sensitivity and the hot tearing sensitivity of weld metal.Additionally, (include Ar+20%CO in MAG weldering2Argon-rich mixed gas is welded) under the conditions of, if welding wire C content is too high, in welding process, the reaction of C Yu O will increase spatter and produce the tendency of CO pore.
Mn is the main alloy element in weld metal, on the one hand Mn can be as deoxidizer and desulfurizing agent, participate in the redox reaction of welding pool, reduce the oxygen content in weld metal, can improve the use processing performance of welding wire, simultaneously because Mn Yu S has stronger affinity, Mn with S is combined formation MnS, with the form emersion molten bath of slag, can effectively reduce the hot cracking tendency of weld metal；On the other hand Mn has the effect of solution strengthening and crystal grain thinning, and adding appropriate Mn in welding wire is the important means that weld metal realizes Strengthening and Toughening, but too high Mn content easily causes segregation, reduces weld metal toughness.
Si element combines addition generally as deoxidizer with Mn, and Si appropriate in welding wire is indispensable to improving the use manufacturability of welding wire.The strengthening DeGrain of Si butt welded seam, and the Si of too high amount can reduce welding seam toughness.
Ni is uniquely to improve weld seam low-temperature impact toughness, the alloying element of reduction impact transition temperature while strengthening weld seam.
Compared with Mo with Mn, Si, Ni, Cr, its solid solution strengthening effect becomes apparent from, and adds appropriate Mo in weld metal and can reduce brittle transition temperature.
Cr has stronger solution strengthening effect, also it is a kind of carbide former simultaneously, pass through Carbide Precipitation, intensity can be improved further, but, research finds, the improvement adding butt welded seam toughness of Cr is unfavorable, when in weld metal, Cr content exceedes a certain amount of, welding seam toughness may be by serious infringement.
In component of weld wire, add appropriate Ti, Zr, can improve the interim form of Welding Molten Drop, reduce spatter, improve welding procedure, improve weld strength, improve the effect of low-temperature impact toughness.
In some embodiments, described microalloy includes at least one in Ti and Zr.
In some embodiments, non-gold element S≤0.010% in described welding wire, P≤0.015%, N≤70PPm, O≤50PPm.For High Tensile Steel Weld Metal, S, P, N, O are harmful elements, must strictly be limited, and the weld metal that intensity rank is the highest, the restriction to these objectionable impurities constituent contents should be stricter.
The FeS that S and Fe generates is easily and Fe forms low-melting-point eutectic, increases weld metal fire check sensitivity, and particularly to high Ni alloy system welding wire, therefore, its content should strictly control.
The mechanical property of P Resistance of Weld Metal and cracking resistance all have adverse influence, segregation it is easily caused in weld seam, increase hot tearing sensitivity and the temper brittleness of weld metal, P makes the intensity hardness of weld seam increase simultaneously, and plasticity toughness reduces, particularly reduce the low-temperature impact toughness of weld metal, make weld seam that so-called " cold brittleness " to occur, it is therefore desirable to this element is strictly limited.
The toughness of weld metal of low-alloy steel is harmful to by N, and research shows, when the N content in weld metal is more than 100PPm, the low-temperature flexibility of weld metal will significantly reduce, its reason be the solution strengthening caused due to the N in weld seam and bring to anchoring of dislocation.
O is mainly mingled with form with oxide in steel and exists, in wire reel unit, oxide is mingled with the drawing property to welding wire and adversely affects, oxide in welding wire participates in Welding Metallurgy reaction in welding process simultaneously, use processing performance, alloy transfer, the alloying of weld metal, the generation of field trash and distribution on welding wire all can bring impact, and then affect the structure property of weld metal.
In sum, the welding wire of present invention design, it provides the benefit that: ensures that deposited metal not only has higher intensity, and has good plasticity and low-temperature flexibility, it is ensured that ensures the cold-crack resistance energy of weld metal under relatively low or suitable preheating temperature conditions.
Accompanying drawing explanation
Fig. 1 for the present invention design welding wire and contrast the hot strength of welding wire, relaxed diameter and stick up away from Data Comparison form.
Fig. 2 is the welding variables that the test present invention designs welding wire common process performance.
Fig. 3 designs welding wire and contrast welding wire common process performance data table under different welding conditions for the present invention.
Fig. 4 designs the deposited metal mechanical performance data contrast form of welding wire and contrast welding wire for the present invention.
Fig. 5 designs the organization charts of as-welded district of welding wire deposited metal microstructure for the present invention.
Fig. 6 designs the organization charts of district of reheating of welding wire deposited metal microstructure for the present invention.
Fig. 7 designs welding wire cold-crack resistance for the present invention can test data form.
Fig. 8 is the impact test data form of temperature Resistance of Weld Metal mechanical property between welding bead.
Fig. 9 is the impact test tables of data of post weld heat treatment Resistance of Weld Metal mechanical property.
Figure 10 is the as-welded district when 480 DEG C × 2h and district's microstructure comparison diagram of reheating.
Figure 11 is the as-welded district when 550 DEG C × 2h and district's microstructure comparison diagram of reheating.
Detailed description of the invention
Below by implementing step, the present invention is further illustrated.Described soldering wire alloy system uses Mn2-Ni2-Cr-Mo system, and the component of alloy and percentage by weight be: C≤0.10%, Mn:1.4-2.0%, Si:0.4-0.9%, Ni:1.8-2.1%, Mo:0.3-0.5%, Cr:0.2-0.6%, microalloy: Ti≤0.020%, Zr≤0.020%, remaining is ferrum.
Preferably, described microalloy includes at least one in Ti and Zr.
Preferably, non-gold element S≤0.010% in described welding wire, P≤0.015%, N≤70PPm, O≤50PPm.
Detailed description of the invention one:
The component of soldering wire alloy and percentage ratio is: C:0.1%, Mn:1.4%, Si:0.4%, Ni:2.1%, Mo:0.5%, Cr:0.2%, microalloy: Ti:0.020%, Zr:0.020%, remaining is ferrum, the most non-gold element content is: S:0.010%, P:0.015%, N:70PPm, O:50PPm.
Detailed description of the invention two:
C:0.08%, Mn:2.0%, Si:0.9%, Ni:1.8%, Mo:0.3%, Cr:0.6%, microalloy: Ti:0.010%, remaining is ferrum, and the most non-gold element content is: S:0.008%, P:0.01%, N:50PPm, O:40PPm.
Detailed description of the invention three:
C:0.07%, Mn:1.7%, Si:0.6%, Ni:1.9%, Mo:0.4%, Cr:0.4%, microalloy: Zr:
0.015%, remaining is ferrum, and the most non-gold element content is: S:0.010%, P:0.015%, N:70PPm, O:50PPm.
Three of the above detailed description of the invention, is smelted by welding wire respectively, off-line pickling, drawing welding wire, coppered welding wire, welding wire layer around process sequence, and during drawing welding wire increase welding wire annealing process make.
The welding wire combination property that composition produces designed according to this invention is more excellent, the hot strength of welding wire, relaxed diameter and stick up away from be pass judgment on welding wire key factor, wherein relaxed diameter and stick up away from being to affect welding wire feeding performance key factor in welding process, its control standard is relaxed diameter >=800mm and sticks up away from≤30mm, as it is shown in figure 1, the list data explanation in Fig. 1 is better than its contrast welding wire according to the welding wire that present component design produces.
In order to by the welding wire of actual test and comparison present invention design and contrast welding wire difference in terms of traditional performance, under different welding variables, as shown in Figure 2, the welding wire of present invention design and contrast welding wire data in terms of traditional performance are as shown in Figure 3, from accompanying drawing 3, list data can be seen that, the welding wire of present invention design is better than contrasting welding wire, and the splashing when welding wire of present invention design welds under welding variables is less.
Deposited metal about welding wire stretches and impact test piece sampling is carried out by GB/T 8110 regulation, as in Fig. 4, form result of the test shows: the present invention designs welding wire deposited metal moderate strength, mould, good-toughness, every mechanical performance index be better than contrast welding wire, reached target call comprehensively.The as-welded district tissue of welding wire deposited metal is organized essentially identical with district of reheating, and is ferrite bainite+low-carbon martensite, deposited metal tissue uniform small grains, and as-welded district column crystal feature is inconspicuous, as shown in accompanying drawing 5 and accompanying drawing 6.
In welding wire cold-crack resistance can be tested; format diameter is the welding wire of the present invention design of 1.2mm; welding current be 270-280A, arc voltage be 30-31V, speed of welding be 330mm/min, protective gas be 80% Ar+20%CO2, under conditions of gas flow is 18-20L/min; test data are as shown in the form in accompanying drawing 7; result of the test shows; under the conditions of harsher restraining, preheat 100 DEG C of generations being possible to prevent welding cold cracking.
Between welding bead in the impact test of temperature Resistance of Weld Metal mechanical property, test data are as shown in the list data in accompanying drawing 8, test result: the stretching of welding point weld metal and low-temperature impact toughness all can meet technology requirement, the i.e. welding wire of present invention design is insensitive on the impact of temperature between welding bead, and variations in temperature between welding bead is had stronger adaptability.
In the impact of post weld heat treatment Resistance of Weld Metal mechanical property is tested, test data are as shown in list data in accompanying drawing 9, and it is inconspicuous at 480 DEG C × 2h and two kinds of higher temperature after welding treatment Resistance of Weld Metal tissue morphology impacts of 550 DEG C × 2h, weld metal is as-welded and district's tissue of reheating is the tempered structure of bainite+martensite, its as-welded district and reheat district's microstructure comparison diagram as shown in Figure 10 when 480 DEG C × 2h, the as-welded district and reheat district's microstructure comparison diagram as shown in Figure 11 when 550 DEG C × 2h, thus can obtain, the stress process Welded Joints mechanical property that eliminates using higher temperature has bigger adverse effect.
Being shown by research and production practices, the welding wire spatter of present invention design is little, appearance of weld is attractive in appearance, weld metal cold-crack resistance can be good, and the mechanical property of deposited metal meets technology requirement comprehensively.
Above-described is only some embodiments of the present invention, it is noted that for the person of ordinary skill of the art, on the premise of the creation without departing from the present invention is conceived, it is also possible to making other deformation and improve, these broadly fall into protection scope of the present invention.
Claims (3)
1. a welding wire, it is characterized in that, soldering wire alloy system uses Mn2-Ni2-Cr-Mo system, and the component of alloy and percentage by weight be: C≤0.10%, Mn:1.4-2.0%, Si:0.4-0.9%, Ni:1.8-2.1%, Mo:0.3-0.5%, Cr:0.2-0.6%, microalloy: Ti≤0.020%, Zr≤0.020%, remaining is ferrum.
2. welding wire as claimed in claim 1, it is characterised in that described microalloy includes at least one in Ti and Zr.
3. welding wire as claimed in claim 1, it is characterised in that non-gold element S≤0.010% in described welding wire, P≤0.015%, N≤70PPm, O≤50PPm.
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| CN201510197930.5A CN106141492A (en) | 2015-04-24 | 2015-04-24 | A kind of welding wire |
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| CN201510197930.5A CN106141492A (en) | 2015-04-24 | 2015-04-24 | A kind of welding wire |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106001992A (en) * | 2016-08-22 | 2016-10-12 | 昆山中冶宝钢焊接材料有限公司 | Ultrahigh-strength low-temperature welding wire |
| CN110172644A (en) * | 2019-06-03 | 2019-08-27 | 中国兵器科学研究院宁波分院 | A kind of electric arc increasing material manufacturing high-strength steel silk material and preparation method thereof |
| CN110385545A (en) * | 2018-10-25 | 2019-10-29 | 唐山师范学院 | A kind of manual argon arc welding welding wire steel |
| CN111571062A (en) * | 2020-05-26 | 2020-08-25 | 哈尔滨焊接研究院有限公司 | Low alloy steel gas shielded welding wire for 800 MPa-level welding |
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| CN101733580A (en) * | 2008-11-18 | 2010-06-16 | 山东索力得焊材有限公司 | 800MPa-grade high-strength high-tenacity gas shielded welding wire |
| CN101987403A (en) * | 2010-12-09 | 2011-03-23 | 沈阳航空航天大学 | 900MPa-level high-performance gas shielded welding wire |
| CN103495812A (en) * | 2013-07-29 | 2014-01-08 | 山东索力得焊材有限公司 | 900MPa high-strength welding wire for mining machine and application method |
| CN103862193A (en) * | 2014-02-21 | 2014-06-18 | 宝山钢铁股份有限公司 | High-strength high-toughness solid gas shielded welding wire for pipeline steel |
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| JPH0738640A (en) * | 1993-07-21 | 1995-02-07 | Tdk Corp | Telephone system |
| CN101733580A (en) * | 2008-11-18 | 2010-06-16 | 山东索力得焊材有限公司 | 800MPa-grade high-strength high-tenacity gas shielded welding wire |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106001992A (en) * | 2016-08-22 | 2016-10-12 | 昆山中冶宝钢焊接材料有限公司 | Ultrahigh-strength low-temperature welding wire |
| CN110385545A (en) * | 2018-10-25 | 2019-10-29 | 唐山师范学院 | A kind of manual argon arc welding welding wire steel |
| CN110385545B (en) * | 2018-10-25 | 2022-01-11 | 唐山师范学院 | Welding wire steel for manual argon arc welding |
| CN110172644A (en) * | 2019-06-03 | 2019-08-27 | 中国兵器科学研究院宁波分院 | A kind of electric arc increasing material manufacturing high-strength steel silk material and preparation method thereof |
| CN110172644B (en) * | 2019-06-03 | 2021-07-09 | 中国兵器科学研究院宁波分院 | High-strength steel wire for electric arc additive manufacturing and preparation method thereof |
| CN111571062A (en) * | 2020-05-26 | 2020-08-25 | 哈尔滨焊接研究院有限公司 | Low alloy steel gas shielded welding wire for 800 MPa-level welding |
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Application publication date: 20161123 |