CN105290645A - Electrode for high-strength steel welding and preparation method and application thereof - Google Patents
Electrode for high-strength steel welding and preparation method and application thereof Download PDFInfo
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- CN105290645A CN105290645A CN201510727883.0A CN201510727883A CN105290645A CN 105290645 A CN105290645 A CN 105290645A CN 201510727883 A CN201510727883 A CN 201510727883A CN 105290645 A CN105290645 A CN 105290645A
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- welding rod
- strength steel
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- deposited metal
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3053—Fe as the principal constituent
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/40—Making wire or rods for soldering or welding
Abstract
The invention provides an electrode for high-strength steel welding. The electrode comprises a welding core and a coating. The coating is composed of, by weight, 34%-48% of CaCO3, 13%-23% of CaF2, 4%-9% of TiO2, 4%-8% of SiO2, 2%-7% of Mn, 4%-10% of Si-Fe, 2%-7% of Ni, 0.5%-2.5% of Mo-Fe, 0.1%-0.8% of C, 0.5%-2% of Na2CO3, 0.5%-2% of CMC, 1%-2% of rare earth metal or oxides thereof and the balance iron power and unavoidable impurities. A CaO-CaF2-TiO2-SiO2 type basic slag system is adopted, alloying element transition and removal of harmful impurities such as O, N, S and P can be facilitated, the welding process property and mechanical property of the electrode are good, and the demand for 460MPa high-strength steel welding is met; the yield strength of deposited metal is larger than or equal to 500MPa, the tensile strength is larger than or equal to 600MPa, and Charpy impact KV2 (minus 40 DEG C) of the deposited metal is larger than or equal to 100J; the content of diffusible hydrogen of the deposited metal of the electrode reaches the level of ultra-low hydrogen.
Description
Technical field
The invention belongs to technical field of welding materials, be specifically related to a kind of welding rod for high-strength steel welding and its preparation method and application, can be applicable to the supplementary material welding of For Offshore Structural Steel material.
Background technology
At present, in order to reduce ocean platform weight and manufacturing cost in ocean structure, steel must be reduced to greatest extent use and optimizing structure design, therefore, the intensity rank of employing steel will be more and more higher, material thickness also constantly increases, yield strength more than the steel grade usage ratio such as EQ47, EQ56, EQ70 of 460MPa more than 40%.
But, the use of high strength, heavy thickness material then proposes larger challenge to solder technology, require that the welding material selected not only has good welds operating procedure performance, simultaneously under the constraint (restraint) degree condition of heavy thickness, high strength, there is good cracking resistance, good tough combination property, good decay resistance and good fatigue crack extended capability.
Through development work for many years, China has developed EQ46 high strength offshore platform steel and has started volume shipment, can substitute same level imported steel completely.But progress is slow in the supporting welding material of this high strength offshore platform steel, domesticly fail timely supporting development welding material, most dependence on import wlding, cause manufacturing cost to increase and construction period longer.Therefore, the high-end welding material meeting offshore engineering is developed as early as possible significant.
Summary of the invention
In order to solve Problems existing in above-mentioned technology, the invention provides a kind of welding rod for the welding of 460MPa level high-strength steel, the deposited metal composition of this welding rod, deposited metal mechanical property and diffusible hydrogen content all can meet the welding requirements of 460MPa level high-strength steel.
The invention provides a kind of welding rod for high-strength steel welding, comprise core wire and coating, described coating is made up of the component of following percentage by weight: CaCO
3: 34 ~ 48%, CaF
2: 13 ~ 23%, TiO
2: 4 ~ 9%, SiO
2: 4 ~ 8%, Mn:2 ~ 7%, Si-Fe:4 ~ 10%, Ni:2 ~ 7%, Mo-Fe:0.5 ~ 2.5%, C:0.1 ~ 0.8%, Na
2cO
3: 0.5 ~ 2%, CMC:0.5 ~ 2%, rare earth metal or its oxide: 1 ~ 2%, surplus is iron powder and inevitable impurity.
As preferably, above-mentioned coating is made up of the component of following percentage by weight: CaCO
3: 48%, CaF
2: 23%, TiO
2: 4%, SiO
2: 6%, Mn:2%, Si-Fe:4%, Ni:2%, Mo-Fe:0.5%, C:0.1%, Na
2cO
3: 1.5%, CMC:0.5%, rare-earth oxide: 2%, surplus is iron powder and inevitable impurity.
As preferably, above-mentioned coating is made up of the component of following percentage by weight: CaCO
3: 45%, CaF
2: 18%, TiO
2: 5%, SiO
2: 7%, Mn:3%, Si-Fe:4%, Ni:5%, Mo-Fe:2.5%, C:0.5%, Na
2cO
3: 0.5%, CMC:2%, rare-earth oxide: 1.5%, surplus is iron powder and inevitable impurity.
As preferably, CaCO in above-mentioned coating
3with CaF
2weight ratio be 1.5 ~ 2.5.
As preferably, above-mentioned core wire adopts H08T carbon steel steel core, and it is C:0.071%, Si:0.11%, Mn:0.42%, S:0.004%, P:0.005% that its chemical composition accounts for core wire percentage by weight, and all the other are iron.
This welding rod for high-strength steel welding of the present invention can be used for the welding of ocean platform 460MPa level high-strength steel.
In the present invention, CaCO
3effect be gas making, slag making, simultaneously can also remove S, P; CaCO
3when ratio is higher, due to CaCO
3the CO decomposited
2gas can increase blow force of arc, improves arc stability, is conducive to the droplet transfer, and electrode tip horse-hof shape is not obvious, and welding rod has good vertical position welding operability.But CaCO
3content higher than 48% time, the mobility of slag is deteriorated, and welding bead is narrow and coarse, and convexity increases, unsightly shaping; CaCO
3content lower than 34% time, the CO decomposited
2gas is less, and insufficient to molten drop protection, weld metal is easily involved in gas, makes H in weld seam
2and N
2increase, the defect such as easily to crack, catabolite CaO is less simultaneously, and cause desulfurization, dephosphorization insufficient, easily form solidification cracking, weld metal impact flexibility sharply declines simultaneously.In sum, the CaCO of 34% ~ 48% is added in coating
3.
CaF
2main Function is slag making, removes in weld seam [H] simultaneously, needs control CaF
2addition.CaF
2content higher than 23% time, easily cause coating fusing point to reduce, sleeve shortens, blow force of arc reduce, bad stability, slag hardens, and is unfavorable for de-slag, CaF
2for anti-ionization material, and fluorine and electron affinity are very large, very easily capture the electronics in electric arc, and electron amount in electric arc is reduced, and arc stability is deteriorated, and meanwhile, during vertical position welding, electrode tip easily produces the shape of a hoof, makes vertical position welding operating difficulties; CaF
2content lower than 13% time, dehydrogenation declines, in weld seam, [H] content increases, and causes hydrogen embrittlement, weld metal plasticity is declined, form white point, produces cold crack etc., therefore, by CaF
2content controls 13% ~ 23%.
The welding technological properties of basic electrode depends primarily on CaCO
3/ CaF
2ratio, for making welding rod have good processing performance, control CaCO
3/ CaF
2ratio be 1.5 ~ 2.5.
TiO
2effect be make slag have suitable fusing point and viscosity, make the difference between weld metal and slag with larger linear expansion coefficient, thus improve the removability of slag; Slag setting rate also can be made to accelerate, form short slag, be conducive to all-position welding; In addition, rutile (TiO
2) also there is good arc-stabilising, obviously can reduce splashing.TiO
2content lower than 4% time, TiO
2hot removability of slag effect not obvious.TiO
2content higher than 9% time, weld seam easily splits, mechanical performance degradation, therefore, TiO
2content controls to be advisable in 4 ~ 9% scopes.
Appropriate SiO is added in coating
2, SiO during arc burning
2and CaCO
3the CaO decomposed combines can generate calcium metasilicate, and in slag process of setting, α calcium metasilicate is converted into β calcium metasilicate, and because the two coefficient of expansion is different, slag is crisp, and the removability of slag is improved greatly, is particularly conducive to de-slag in groove.But SiO
2when content is more than 8%, viscosity coefficient of dross can be made excessive, hinder the effect of mass transmitting between slag and liquid metal, affect metallurgical reaction and fully carry out, hinder molten pool gas effusion, easily produce pore, meanwhile, splash comparatively large, explosive sound is remarkable.And SiO
2content lower than 4% time, viscosity coefficient of dross is too small again, slag can be made again to cover uneven, lose due protective effect, the too small all positon welding also directly affecting welding rod of viscosity.
Add ferrosilicon in coating and mainly make deoxidier, adding of ferrosilicon can make appearance of weld attractive in appearance, and ripple is careful; Si-Fe content is 4 ~ 10%, when Si-Fe content in coating lower than 4% time, deoxidation is insufficient, in weld seam oxygen content increase, weld metal impact flexibility and percentage elongation all reduce, when Si-Fe content in coating higher than 10% time, weld metal intensity increases severely, toughness declines, and weld metal graphitization is serious simultaneously, and oxidation generates SiO
2the viscosity of slag is increased, and gas is not easily overflowed.
And Mn is Transition-metal Alloys, participates in de-S reaction, and by solution strengthening, increase acicular ferrite content, improve the effect of weld metal intensity and toughness.Mn content higher than 7% time, weld metal ductility, degraded toughness; Mn content lower than 2% time, acicular ferrite is few, forms thick ferrite crystal grain, can not organize crack propagation, not reach strengthening effect;
The effect of Mo-Fe improves weld metal intensity, adjustable height low-temperature impact toughness within the specific limits.When Mo-Fe content is greater than 2.5%, On Impact Toughness is totally unfavorable, Mo-Fe content lower than 0.5% time, strengthening effect is not obvious.
Ni is alloying element important in weld metal, can improve the low-temperature flexibility of weld metal, and reduce ductile-brittle transition temperature, Ni itself also has good decay resistance.And when Ni content lower than 3% time, little to the effect of raising ferrite matrix toughness, good low-temperature flexibility can not be obtained, Ni content higher than 6% time, easily producing stress corrosion cracking (SCC), in order to obtain excellent low-temperature flexibility, in coating, adding 3% ~ 6%Ni.
Na is added in coating
2cO
3, CMC effectively can improve the extrusion performance of welding rod.
The effect adding rare earth element in coating is purification weld seam, reduces non-metallic inclusion in weld seam, strengthens coating reproducibility simultaneously, improve the transfer coefficient of alloying element, but rare earth element is expensive, addition is less, therefore, controls its addition 1 ~ 2%.
In addition, present invention also offers a kind of method preparing above-mentioned welding rod, comprise the steps:
1) each component taking coating according to described amount mixes;
2) using step 1) blending ingredients of gained adopts K:Na to be that the waterglass of 2:1 is as adhesive bond;
3) by step 2) binding of gained is coated on core wire by hydraulic press, after natural environment airing is stiff to coating, put into drying oven again and be heated to 120 DEG C of insulations two hours, continue to be heated to 250 DEG C of insulations two hours, then be heated to 360 DEG C ~ 380 DEG C oven dry two hours.
Beneficial effect of the present invention:
(1) this welding rod for high-strength steel welding provided by the invention adopts CaO-CaF
2-TiO
2-SiO
2type basic slag system, is conducive to alloy transfer and removes the objectionable impurities such as O, N, S, P, welding rod welding technological properties and good mechanical properties, meet the requirement of 460MPa level high-strength steel welding, deposited metal yield strength>=500MPa, tensile strength>=600MPa, deposited metal Charpy impact KV
2(-40 DEG C)>=100J, and the content of welding rod deposited metal diffusible hydrogen reaches the level of ultralow-hydrogen low.
(2) this core diameter for high-strength steel welding provided by the invention is little, and welding technological properties is excellent, is applicable to all-position welding.
(3) this welding rod for high-strength steel welding provided by the invention not only has good welds operating procedure performance, simultaneously under heavy thickness, high constraint (restraint) degree condition, there is good cracking resistance, good tough combination property and good decay resistance.
Detailed description of the invention
Embodiment 1:
The present embodiment specifically provides a kind of welding rod for high-strength steel welding, and comprise core wire and coating, described coating is made up of the component of following percentage by weight: marble (CaCO
3): 34%, fluorite (CaF
2): 14%, rutile (TiO
2): 9%, silicon powder (SiO
2): 8%, electrolytic manganese (Mn): 7%, ferrosilicon (Si-Fe): 10%, nickel powder (Ni): 4.5%, molybdenum-iron (Mo-Fe): 2.5%, graphite (C): 0.5%, soda ash (Na
2cO
3): 1.0%, microcrystalline cellulose (CMC): 1.0%, rare earth metal (Re): 1.0%, surplus is iron powder and inevitable impurity.
Wherein, core wire is the H08T carbon steel steel core that S, P content is lower, and it is C:0.071%, Si:0.11%, Mn:0.42%, S:0.004%, P:0.005% that its chemical composition accounts for core wire percentage by weight, and all the other are iron.
Welding rod is prepared according to following step:
1) each component taking coating according to above-mentioned amount mixes;
2) using step 1) blending ingredients of gained adopts K:Na to be that the waterglass of 2:1 is as adhesive bond;
3) by step 2) binding of gained is coated on core wire by hydraulic press, after natural environment airing is stiff to coating, put into drying oven again and be heated to 120 DEG C of insulations two hours, continue to be heated to 250 DEG C of insulations two hours, then be heated to 360 DEG C ~ 380 DEG C oven dry two hours.
Adopt the chemical composition of the deposited metal of the present embodiment welding rod as shown in table 1, the actual measured value of the deposited metal composition of welding rod is all within the scope of guarantee value.The deposited metal mechanical property of this welding rod is as shown in table 2, and the actual measured value of the deposited metal mechanical property of welding rod is all within the scope of guarantee value.
Adopt the banjo fixing butt jointing mechanical property of the present embodiment welding rod as shown in table 3, the actual measured value of the banjo fixing butt jointing mechanical property of welding rod is all within the scope of guarantee value.
Adopt the deposited metal diffusible hydrogen content (mercury process) of the present embodiment welding rod as shown in table 4, detect through repeatedly actual, the actual value of the deposited metal diffusible hydrogen content of this welding rod is within the scope of guarantee value.
CTOD (crack tip opening displacement) test data of the present embodiment welding rod is as shown in table 5, and the CTOD characteristic value of welding rod is greater than 0.15mm, and index meets design requirement.Welding rod oblique Y test data is as shown in table 6.
Embodiment 2:
The present embodiment specifically provides a kind of welding rod for high-strength steel welding, and comprise core wire and coating, described coating is made up of the component of following percentage by weight: marble (CaCO
3): 42%, fluorite (CaF
2): 18%, rutile (TiO
2): 7%, silicon powder (SiO
2): 4%, electrolytic manganese (Mn): 5%, ferrosilicon (Si-Fe): 6%, nickel powder (Ni): 7%, molybdenum-iron (Mo-Fe): 1.3%, graphite (C): 0.3%, soda ash (Na
2cO
3): 2%, microcrystalline cellulose (CMC): 0.5%, rare-earth oxide (ReO): 1.5%, surplus is iron powder and inevitable impurity.
Wherein, core wire is the H08T carbon steel steel core that S, P content is lower, and it is C:0.071%, Si:0.11%, Mn:0.42%, S:0.004%, P:0.005% that its chemical composition accounts for core wire percentage by weight, and all the other are iron.
Welding rod is prepared according to following step:
1) each component taking coating according to above-mentioned amount mixes;
2) using step 1) blending ingredients of gained adopts K:Na to be that the waterglass of 2:1 is as adhesive bond;
3) by step 2) binding of gained is coated on core wire by hydraulic press, after natural environment airing is stiff to coating, put into drying oven again and be heated to 120 DEG C of insulations two hours, continue to be heated to 250 DEG C of insulations two hours, then be heated to 360 DEG C ~ 380 DEG C oven dry two hours.
Adopt the chemical composition of the deposited metal of the present embodiment welding rod as shown in table 1, the actual measured value of the deposited metal composition of welding rod is all within the scope of guarantee value.The deposited metal mechanical property of this welding rod is as shown in table 2, and the actual measured value of the deposited metal mechanical property of welding rod is all within the scope of guarantee value.
Adopt the banjo fixing butt jointing mechanical property of the present embodiment welding rod as shown in table 3, the actual measured value of the banjo fixing butt jointing mechanical property of welding rod is all within the scope of guarantee value.
Adopt the deposited metal diffusible hydrogen content (mercury process) of the present embodiment welding rod as shown in table 4, detect through repeatedly actual, the actual value of the deposited metal diffusible hydrogen content of this welding rod is within the scope of guarantee value.
CTOD (crack tip opening displacement) test data of the present embodiment welding rod is as shown in table 5, and the CTOD characteristic value of welding rod is greater than 0.15mm, and index meets design requirement.Welding rod oblique Y test data is as shown in table 6.
Embodiment 3:
The present embodiment specifically provides a kind of welding rod for high-strength steel welding, and comprise core wire and coating, described coating is made up of the component of following percentage by weight: marble (CaCO
3): 48%, fluorite (CaF
2): 23%, rutile (TiO
2): 4%, silicon powder (SiO
2): 6%, electrolytic manganese (Mn): 2%, ferrosilicon (Si-Fe): 4%, nickel powder (Ni): 2%, molybdenum-iron (Mo-Fe): 0.5%, graphite (C): 0.1%, soda ash (Na
2cO
3): 1.5%, microcrystalline cellulose (CMC): 0.5%, rare-earth oxide (ReO): 2%, surplus is iron powder and inevitable impurity.
Wherein, core wire is the H08T carbon steel steel core that S, P content is lower, and it is C:0.071%, Si:0.11%, Mn:0.42%, S:0.004%, P:0.005% that its chemical composition accounts for core wire percentage by weight, and all the other are iron.
Welding rod is prepared according to following step:
1) each component taking coating according to above-mentioned amount mixes;
2) using step 1) blending ingredients of gained adopts K:Na to be that the waterglass of 2:1 is as adhesive bond;
3) by step 2) binding of gained is coated on core wire by hydraulic press, after natural environment airing is stiff to coating, put into drying oven again and be heated to 120 DEG C of insulations two hours, continue to be heated to 250 DEG C of insulations two hours, then be heated to 360 DEG C ~ 380 DEG C oven dry two hours.
Adopt the chemical composition of the deposited metal of the present embodiment welding rod as shown in table 1, the actual measured value of the deposited metal composition of welding rod is all within the scope of guarantee value.The deposited metal mechanical property of this welding rod is as shown in table 2, and the actual measured value of the deposited metal mechanical property of welding rod is all within the scope of guarantee value.
Adopt the banjo fixing butt jointing mechanical property of the present embodiment welding rod as shown in table 3, the actual measured value of the banjo fixing butt jointing mechanical property of welding rod is all within the scope of guarantee value.
Adopt the deposited metal diffusible hydrogen content (mercury process) of the present embodiment welding rod as shown in table 4, detect through repeatedly actual, the actual value of the deposited metal diffusible hydrogen content of this welding rod is within the scope of guarantee value.
CTOD (crack tip opening displacement) test data of the present embodiment welding rod is as shown in table 5, and the CTOD characteristic value of welding rod is greater than 0.15mm, and index meets design requirement.Welding rod oblique Y test data is as shown in table 6.
Embodiment 4:
The present embodiment specifically provides a kind of welding rod for high-strength steel welding, and comprise core wire and coating, described coating is made up of the component of following percentage by weight: marble (CaCO
3): 48%, fluorite (CaF
2): 13%, rutile (TiO
2): 6%, silicon powder (SiO
2): 5%, electrolytic manganese (Mn): 4%, ferrosilicon (Si-Fe): 8%, nickel powder (Ni): 3.5%, molybdenum-iron (Mo-Fe): 1%, graphite (C): 0.8%, soda ash (Na
2cO
3): 0.8%, microcrystalline cellulose (CMC): 1.5%, rare-earth oxide (ReO): 2%, surplus is iron powder and inevitable impurity.
Wherein, core wire is the H08T carbon steel steel core that S, P content is lower, and it is C:0.071%, Si:0.11%, Mn:0.42%, S:0.004%, P:0.005% that its chemical composition accounts for core wire percentage by weight, and all the other are iron.
Welding rod is prepared according to following step:
1) each component taking coating according to above-mentioned amount mixes;
2) using step 1) blending ingredients of gained adopts K:Na to be that the waterglass of 2:1 is as adhesive bond;
3) by step 2) binding of gained is coated on core wire by hydraulic press, after natural environment airing is stiff to coating, put into drying oven again and be heated to 120 DEG C of insulations two hours, continue to be heated to 250 DEG C of insulations two hours, then be heated to 360 DEG C ~ 380 DEG C oven dry two hours.
Adopt the chemical composition of the deposited metal of the present embodiment welding rod as shown in table 1, the actual measured value of the deposited metal composition of welding rod is all within the scope of guarantee value.The deposited metal mechanical property of this welding rod is as shown in table 2, and the actual measured value of the deposited metal mechanical property of welding rod is all within the scope of guarantee value.
Adopt the banjo fixing butt jointing mechanical property of the present embodiment welding rod as shown in table 3, the actual measured value of the banjo fixing butt jointing mechanical property of welding rod is all within the scope of guarantee value.
Adopt the deposited metal diffusible hydrogen content (mercury process) of the present embodiment welding rod as shown in table 4, detect through repeatedly actual, the actual value of the deposited metal diffusible hydrogen content of this welding rod is within the scope of guarantee value.
CTOD (crack tip opening displacement) test data of the present embodiment welding rod is as shown in table 5, and the CTOD characteristic value of welding rod is greater than 0.15mm, and index meets design requirement.Welding rod oblique Y test data is as shown in table 6.
Embodiment 5:
The present embodiment specifically provides a kind of welding rod for high-strength steel welding, and comprise core wire and coating, described coating is made up of the component of following percentage by weight: marble (CaCO
3): 45%, fluorite (CaF
2): 18%, rutile (TiO
2): 5%, silicon powder (SiO
2): 7%, electrolytic manganese (Mn): 3%, ferrosilicon (Si-Fe): 4%, nickel powder (Ni): 5%, molybdenum-iron (Mo-Fe): 2.5%, graphite (C): 0.5%, soda ash (Na
2cO
3): 0.5%, microcrystalline cellulose (CMC): 2%, rare-earth oxide (ReO): 1.5%, surplus is iron powder and inevitable impurity.
Wherein, core wire is the H08T carbon steel steel core that S, P content is lower, and it is C:0.071%, Si:0.11%, Mn:0.42%, S:0.004%, P:0.005% that its chemical composition accounts for core wire percentage by weight, and all the other are iron.
Welding rod is prepared according to following step:
1) each component taking coating according to above-mentioned amount mixes;
2) using step 1) blending ingredients of gained adopts K:Na to be that the waterglass of 2:1 is as adhesive bond;
3) by step 2) binding of gained is coated on core wire by hydraulic press, after natural environment airing is stiff to coating, put into drying oven again and be heated to 120 DEG C of insulations two hours, continue to be heated to 250 DEG C of insulations two hours, then be heated to 360 DEG C ~ 380 DEG C oven dry two hours.
Adopt the chemical composition of the deposited metal of the present embodiment welding rod as shown in table 1, the actual measured value of the deposited metal composition of welding rod is all within the scope of guarantee value.The deposited metal mechanical property of this welding rod is as shown in table 2, and the actual measured value of the deposited metal mechanical property of welding rod is all within the scope of guarantee value.
Adopt the banjo fixing butt jointing mechanical property of the present embodiment welding rod as shown in table 3, the actual measured value of the banjo fixing butt jointing mechanical property of welding rod is all within the scope of guarantee value.
Adopt the deposited metal diffusible hydrogen content (mercury process) of the present embodiment welding rod as shown in table 4, detect through repeatedly actual, the actual value of the deposited metal diffusible hydrogen content of this welding rod is within the scope of guarantee value.
CTOD (crack tip opening displacement) test data of the present embodiment welding rod is as shown in table 5, and the CTOD characteristic value of welding rod is greater than 0.15mm, and index meets design requirement.Welding rod oblique Y test data is as shown in table 6.
Table 1: the chemical composition of the deposited metal of various embodiments of the present invention welding rod
Table 2: the deposited metal mechanical property of various embodiments of the present invention welding rod
Table 3: the banjo fixing butt jointing mechanical property of various embodiments of the present invention welding rod
Table 4: the deposited metal diffusible hydrogen content of various embodiments of the present invention welding rod
Table 5: the CTOD test data of various embodiments of the present invention welding rod
| Thickness/mm | Width/mm | δm/mm | Gap position | |
| Experimental example 1 | 15.96 | 31.92 | 0.560 | Weld pipe mill |
| Experimental example 2 | 15.86 | 31.86 | 0.565 | Weld pipe mill |
| Experimental example 3 | 15.86 | 32.00 | 0.513 | Weld pipe mill |
| Experimental example 4 | 15.92 | 32.15 | 0.557 | Weld pipe mill |
| Experimental example 5 | 15.89 | 31.09 | 0.504 | Weld pipe mill |
Table 6: the oblique Y test data of various embodiments of the present invention welding rod
In sum, chemical composition, mechanical property, the expansion hydrogen content of the deposited metal of this welding rod for high-strength steel welding provided by the invention, and banjo fixing butt jointing mechanical property, CTOD test data, oblique Y test data, all within the scope of guarantee value, is applicable to 460MPa level process for welding high-strength steel.
More than exemplifying is only illustrate of the present invention, does not form the restriction to protection scope of the present invention, everyly all belongs within protection scope of the present invention with the same or analogous design of the present invention.
Claims (7)
1., for a welding rod for high-strength steel welding, comprise core wire and coating, it is characterized in that: described coating is made up of the component of following percentage by weight: CaCO
3: 34 ~ 48%, CaF
2: 13 ~ 23%, TiO
2: 4 ~ 9%, SiO
2: 4 ~ 8%, Mn:2 ~ 7%, Si-Fe:4 ~ 10%, Ni:2 ~ 7%, Mo-Fe:0.5 ~ 2.5%, C:0.1 ~ 0.8%, Na
2cO
3: 0.5 ~ 2%, CMC:0.5 ~ 2%, rare earth metal or its oxide: 1 ~ 2%, surplus is iron powder and inevitable impurity.
2., as claimed in claim 1 for the welding rod of high-strength steel welding, it is characterized in that: described coating is made up of the component of following percentage by weight: CaCO
3: 48%, CaF
2: 23%, TiO
2: 4%, SiO
2: 6%, Mn:2%, Si-Fe:4%, Ni:2%, Mo-Fe:0.5%, C:0.1%, Na
2cO
3: 1.5%, CMC:0.5%, rare-earth oxide: 2%, surplus is iron powder and inevitable impurity.
3., as claimed in claim 1 for the welding rod of high-strength steel welding, it is characterized in that: described coating is made up of the component of following percentage by weight: CaCO
3: 45%, CaF
2: 18%, TiO
2: 5%, SiO
2: 7%, Mn:3%, Si-Fe:4%, Ni:5%, Mo-Fe:2.5%, C:0.5%, Na
2cO
3: 0.5%, CMC:2%, rare-earth oxide: 1.5%, surplus is iron powder and inevitable impurity.
4. the welding rod for high-strength steel welding as described in claim 1 or 2 or 3, is characterized in that: CaCO in described coating
3with CaF
2weight ratio be 1.5 ~ 2.5.
5. the welding rod for high-strength steel welding as described in claim 1 or 2 or 3, is characterized in that: described core wire adopts H08T carbon steel steel core, and it is C:0.071% that its chemical composition accounts for core wire percentage by weight, Si:0.11%, Mn:0.42%, S:0.004%, P:0.005%, all the other are iron.
6. the preparation method of the welding rod for high-strength steel welding as described in any one of Claims 1 to 5, is characterized in that: comprise the steps:
1) each component taking coating according to described amount mixes;
2) using step 1) blending ingredients of gained adopts K:Na to be that the waterglass of 2:1 is as adhesive bond;
3) by step 2) binding of gained is coated on core wire by hydraulic press, after natural environment airing is stiff to coating, put into drying oven again and be heated to 120 DEG C of insulations two hours, continue to be heated to 250 DEG C of insulations two hours, then be heated to 360 DEG C ~ 380 DEG C oven dry two hours.
7. the purposes of the welding rod for high-strength steel welding as described in any one of Claims 1 to 5, is characterized in that: described welding rod is used for the welding of ocean platform 460MPa level high-strength steel.
Priority Applications (1)
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| CN105710559A (en) * | 2016-04-19 | 2016-06-29 | 南通豪泰焊材有限公司 | Nickel-based alloy welding rod and manufacturing method thereof |
| CN105834614A (en) * | 2016-05-26 | 2016-08-10 | 武汉铁锚焊接材料股份有限公司 | Low alloy heat-resisting steel electrode containing vanadium |
| CN105880870A (en) * | 2016-05-24 | 2016-08-24 | 武汉铁锚焊接材料股份有限公司 | High-toughness heat-resisting steel welding rod |
| CN106078004A (en) * | 2016-06-23 | 2016-11-09 | 武汉铁锚焊接材料股份有限公司 | A kind of low temperature spherical tank ultralow-hydrogen low high-tenacity welding electrodes |
| CN106425164A (en) * | 2016-12-15 | 2017-02-22 | 昆山京群焊材科技有限公司 | High-strength steel electrode used for minus 50 DEG C low temperature spherical tank |
| CN108188614A (en) * | 2017-12-25 | 2018-06-22 | 昆山京群焊材科技有限公司 | A kind of 650 DEG C of ultra supercritical coal-fired units coating transiens heat resistant steel electrode |
| CN110977240A (en) * | 2019-11-18 | 2020-04-10 | 天津大桥焊材集团有限公司 | Welding rod special for 80 kg-grade weathering steel and production method thereof |
| CN112496597A (en) * | 2021-02-05 | 2021-03-16 | 四川西冶新材料股份有限公司 | High-strength high-toughness coating of hydrogen-resistant steel, welding rod and preparation method of welding rod |
| CN112570927A (en) * | 2020-12-03 | 2021-03-30 | 天津大桥龙兴焊接材料有限公司 | Ultralow-hydrogen electrode for welding ultrahigh-strength wear-resistant steel and preparation method thereof |
| CN115338559A (en) * | 2022-08-18 | 2022-11-15 | 四川大西洋焊接材料股份有限公司 | Coating, welding rod and deposited metal |
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|---|---|---|---|---|
| CN105665958A (en) * | 2016-03-18 | 2016-06-15 | 武汉铁锚焊接材料股份有限公司 | Matched welding rod suitable for ocean platform 690 MPa grade rack steel |
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| CN105880870B (en) * | 2016-05-24 | 2018-03-20 | 武汉铁锚焊接材料股份有限公司 | A kind of high-tenacity heat-resistant steel electrode |
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| CN106078004A (en) * | 2016-06-23 | 2016-11-09 | 武汉铁锚焊接材料股份有限公司 | A kind of low temperature spherical tank ultralow-hydrogen low high-tenacity welding electrodes |
| CN106078004B (en) * | 2016-06-23 | 2018-10-02 | 武汉铁锚焊接材料股份有限公司 | A kind of low temperature spherical tank ultralow-hydrogen low high-tenacity welding electrodes |
| CN106425164A (en) * | 2016-12-15 | 2017-02-22 | 昆山京群焊材科技有限公司 | High-strength steel electrode used for minus 50 DEG C low temperature spherical tank |
| CN108188614A (en) * | 2017-12-25 | 2018-06-22 | 昆山京群焊材科技有限公司 | A kind of 650 DEG C of ultra supercritical coal-fired units coating transiens heat resistant steel electrode |
| CN110977240A (en) * | 2019-11-18 | 2020-04-10 | 天津大桥焊材集团有限公司 | Welding rod special for 80 kg-grade weathering steel and production method thereof |
| CN112570927A (en) * | 2020-12-03 | 2021-03-30 | 天津大桥龙兴焊接材料有限公司 | Ultralow-hydrogen electrode for welding ultrahigh-strength wear-resistant steel and preparation method thereof |
| CN112496597A (en) * | 2021-02-05 | 2021-03-16 | 四川西冶新材料股份有限公司 | High-strength high-toughness coating of hydrogen-resistant steel, welding rod and preparation method of welding rod |
| CN115338559A (en) * | 2022-08-18 | 2022-11-15 | 四川大西洋焊接材料股份有限公司 | Coating, welding rod and deposited metal |
| CN115338559B (en) * | 2022-08-18 | 2024-01-26 | 四川大西洋焊接材料股份有限公司 | Coating, welding rod and deposited metal |
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