CN105598596A - Non-preheating combined welding method of 1200MPa high-strength steel - Google Patents
Non-preheating combined welding method of 1200MPa high-strength steel Download PDFInfo
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- CN105598596A CN105598596A CN201610066161.XA CN201610066161A CN105598596A CN 105598596 A CN105598596 A CN 105598596A CN 201610066161 A CN201610066161 A CN 201610066161A CN 105598596 A CN105598596 A CN 105598596A
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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
- B23K28/00—Welding or cutting not covered by any of the preceding groups, e.g. electrolytic welding
- B23K28/02—Combined welding or cutting procedures or apparatus
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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
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/02—Iron or ferrous alloys
- B23K2103/04—Steel or steel alloys
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Abstract
The invention provides a non-preheating combined welding method of 1200MPa high-strength steel. The non-preheating combined welding method comprises the following steps: carrying out groove machining and preprocessing; adopting gas shielded welding to carry out backing weld, wherein welding wires are 500MPa welding wires; adopting carbon dioxide gas shielded welding which carries out mechanical automated welding wire filling to carry out filling welding, wherein the welding wires are 980MPa high-strength welding wires; carrying out carbon arc gouging back chipping; adopting mechanical automated wire filling non-melt argon shielded arc welding to carry out capping layer and end covering layer welding, wherein the welding wires are 560MPa high-strength welding wires. The combined welding method can reduce welding crack sensitivity, a welding line has attractive appearance, and the mechanical property of a welding joint is good. The mechanical automated combined welding technology has the advantages of simple processing step, convenience in operation, high practicality and good popularization and application prospect, production cost can be lowered, and production efficiency is improved.
Description
Technical field
The present invention relates to a kind of welding method of high strength steel, particularly not preheating of tensile strength 1200MPa high strength steel combinationWelding method, belongs to welding technology field.
Background technology
The high strength steel of tensile strength 1200MPa more and more comes into one's own with intensity, the good plasticity and toughness etc. of its superelevation, energyMeet the demand for development in construction machinery production field " high-end, high-tech, high added value ". Solder technology is to affect high strengthThe key factor of steel application, the work of the innovation of welding method, welding material and technique to tensile strength 1200MPa high strength steelCheng Yingyong has vital effect.
1200MPa high strength steel hardenability is large, has stronger cold crack tendency, easily occurs that cold crack and fragility are disconnected in weldingThe defect such as split, welding procedure, quality and welding point microstructure and property are had relatively high expectations. Should ensure the intensity of welding pointReduce again the cold crack sensitiveness of welding point and keep good plasticity and toughness. Weld at present 1200MPa high strength both at home and abroadThe method that steel is conventional is SMAW, gas shielded arc welding, and the selecting of welding material mostly is the strong coupling welding materials such as low Qiang Huo,But before weldering, require preheating, and postwelding requires to carry out post weld heat treatment. But the Welder of weld preheating and post weld heat treatmentSkill is more complicated, and production cost is high, and particularly, for large-scale welding engineering structural member, weld preheating and post weld heat treatment have increasedDifficulty of construction and production cost, and owing to affected by Welding Structure, preheating sometimes and post weld heat treatment are difficult to realize.
Chinese invention patent ZL200910019599.2 and CN103862184A propose 900MPa respectively and 1000MPa is high-strengthThe not preheating welding procedure of degree steel, can realize respectively the not pre-thermal weld of 900MPa and 1000MPa high strength steel. IntensityHigher, welding difficulty is larger, if can, under not preheating, not post weld heat treatment condition, realize tensile strength 1200MPaThe welding of high strength steel, to simplifying welding procedure, improves welder's working condition and will have important meaning with reduction welding production costJustice.
Summary of the invention
The object of the invention is the deficiency for the existing solder technology of tensile strength 1200MPa high strength steel, propose a kind of1200MPa preheating-free combined welding method.
Design, manufacturing process, crack sensitivity and the brittle fracture behavior of the strength matching butt joint of high-strength steel welding pointThere is material impact. The randomness that the present invention is directed to the randomness of weld seam and mother metal tensile strength and mutually combine between them,By the feature to strength matching coefficient and distribution ground experimental study, in conjunction with breaking of tensile strength 1200MPa high strength steelSplit the interaction relationship between the flaw size of toughness, material internal and the strength matching mode three of welding point, carryGo out a kind of for the welded not preheating of 1200MPa high strength steel, the Combination Welding side that does not carry out post weld heat treatmentMethod. Adopt and can reduce in this way welding crack sensibility, bead contour is attractive in appearance and welding joint mechanical property is good. ThisKind method can reduce production costs for the assembled welding process of mechanical automation, enhances productivity, practical, hasWell popularizing application prospect.
For achieving the above object, the present invention adopts following technical scheme:
A kind of 1200MPa high strength steel preheating-free combined welding method, comprising:
Groove processing, pretreatment;
Adopt carbon dioxide gas arc welding to carry out backing welding, welding wire is 500MPa welding wire;
Adopt the carbon dioxide gas arc welding of mechanical automation filler wire to fill welding, welding wire is that 980MPa is high-strengthSteel welding wire;
Carbon arc air gouging cleaning root of weld;
Non-melting electrode argon arc welding carries out capping layer and back cover layer welds to adopt mechanical automation to fill silk, and welding wire is that 560MPa is high-strengthSteel welding wire.
Technical characterstic of the present invention is: backing welding adopts the carbon dioxide of filling " low strong coupling " 500MPa welding wire to protectProtect weldering; Packed layer adopts mechanical automation to fill the carbon dioxide gas arc welding of 980MPa high-strength steel welding wire, multiple tracks multilayerFill weldering; Capping layer and back cover layer welding bead adopt mechanical automation silk filling non-melting electrode argon arc welding, fill 560MPa high-strength steelWelding wire. Strict control heat input in welding process, controlling interlayer temperature is 100～150 DEG C, realizes 1200MPa high with thisThe not preheating Combination Welding of strength steel.
Preferably, adopt the welding of multiple tracks multilayer, controlling interlayer temperature is 100～150 DEG C.
Preferably, in described filling welding process, welding condition is as follows: gage of wire 1.2mm, and arc voltage is 26～30V, welding current is 320～380A, and sweating heat input control is at 10～22kJ/cm, and shield gas flow rate is 15～25L/min。
Preferably, in backing welding welding process, welding parameter is gage of wire 1.2mm, and arc voltage is 26～30V, welderingConnecing electric current is 240～320A, and sweating heat input control is at 15～25kJ/cm, and protective gas is 100%CO2, protective gas streamAmount is 15～20L/min. Existing argon arc welding bottoming welding efficiency is low, and cost is higher. For further reducing welding cost,The present invention adopts the specialized for carbon dioxide gas protection weldering backing welding of low strong coupling welding wire, and equipment is simple, can improve welding production efficiency,Reduce welding cost. And carbon dioxide can with weld seam in diffusible hydrogen generate refractory compound and discharge molten with slag formPond, in this way can reduce the diffusible hydrogen content of welding point, be a kind of ultralow-hydrogen low welding method, be conducive to improveCrack resistance, is suitable for the welding of high strength steel.
Preferably, in cosmetic welding welding process, welding parameter is gage of wire 2.0mm, and arc voltage is 26～30V, welderingConnecing electric current is 240～280A, controls speed of welding and is advisable so that welding bead surfacing is bright and clean; Protective gas is 100%Ar, protectionGas flow is 15～25L/min.
Preferably, in back welding welding process, welding parameter is gage of wire 2.0mm, and arc voltage is 26～30V, welderingConnecing electric current is 240～300A, controls speed of welding and is advisable so that welding bead surfacing is bright and clean. Protective gas is 100%Ar (argon gas),Shield gas flow rate is 15～22L/min.
Preferably, the diameter of described 500MPa level gas shield welding wire is 1.2mm, and its deposited metal composition is with quality hundredProportion by subtraction is counted: C0.02～0.15%, Si0.55～1.10%, Mn1.40～1.90%, P≤0.030%, S≤0.030%;Deposited metal mechanical property is: tensile strength sigmab490～670MPa, yield strength σ s >=400MPa, percentage elongation δ >=18%,0 DEG C of V-notch impact absorbing energy AKV>=47J; 1200MPa high strength steel weldability is poor, easily in welding point root and fusionThere is welding cold cracking in place of district, adopts bottoming welding to coordinate the low coupling welding wire of 500MPa can improve root of weld toughness and (fallLow weld strength, improves joint plasticity and toughness), reduce welding point constraint stress, reduce welding cold crack sensitivity, improveWelding point comprehensive mechanical property.
Preferably, the diameter of described 980MPa high-strength steel gas shield welding wire is 1.2mm, and its deposited metal composition is with matterAmount percentage is counted: C0.1%, Si0.80%, Mn1.80%, Cr0.35%, Ni2.25%, Mo0.60%; Deposited goldBelonging to mechanical property is: tensile strength sigmab>=900MPa, yield strength σs>=840MPa, percentage elongation δ 16～19%, room temperatureLower V-notch impact absorbing energy AKV70～85J；
Preferably, the diameter of described 560MPa high-strength steel gas shield welding wire is 2.0mm, and its deposited metal composition is with matterAmount percentage is counted: C0.08%, Si0.85%, Mn1.50%; Deposited metal mechanical property is: tensile strength sigmab≥560MPa，Yield strength σ s >=450MPa, percentage elongation δ 25～30%, V-notch impact absorbing energy A under room temperatureKV130～180J。
Preferably, in described gas shielded arc welding process, protective gas is that purity is 99.9% carbon dioxide.
Preferably, in described cosmetic welding welding process, protective gas is the inert gas of purity 99.9%Ar.
Not preheating of 1200MPa high strength steel that the present invention proposes, do not carry out the concrete step of the assembled welding process of post weld heat treatmentRapid as follows:
(1) open V-butt in joint to be welded, bevel angle is 45 ° to 60 °, root face 2～3mm;
(2) its surperficial greasy dirt of surface removal that uses hand operated grinding wheel sheet polishing cleaning groove and groove both sides 20～30mm withIron rust, makes it expose metallic luster, with groove and surface after absolute ethyl alcohol or acetone cleaning polishing.
(3) adopt carbon dioxide gas arc welding to carry out backing welding, use " low strong coupling " 500MPa gas shield welding wire,Object is to utilize this welding wire low-intensity high tenacity to improve the crack resistance of weld metal. Welding parameter is: gage of wire 1.2mm,Arc voltage is 26～30V, and welding current is 240～320A, and sweating heat input control, at 15～25kJ/cm, is protected gasBody is 100%CO2, shield gas flow rate is 15～20L/min.
(4) in order to improve weld seam bulk strength and production efficiency, with 980MPa high-strength steel gas shield welding wire cooperation CO2GasProtect weldering and carry out mechanical automation filling welding, adopt the welding of multiple tracks multilayer, control interlayer temperature at 100 DEG C～150 DEG C. ControlWelding parameter processed is: gage of wire 1.2mm, and arc voltage is 26～30V, welding current is 320～380A, sweating heatInput control is at 10～22kJ/cm, and shield gas flow rate is 15～25L/min;
(5) clear up root of weld with carbon arc air gouging, and back of weld is polished flat with hand operated grinding wheel sheet.
(6) in order to obtain good appearance of weld, with 560MPa high-strength steel gas shield welding wire cooperation non-melt pole argon arcThe welding of mechanical automation cosmetic welding is carried out in weldering, and welding parameter is: gage of wire 2.0mm, arc voltage is 26～30V, welderingConnecing electric current is 240～300A, controls speed of welding and is advisable so that welding bead surfacing is bright and clean. Protective gas is 100%Ar (argon gas),Shield gas flow rate is 15～25L/min.
(7) adopt the non-melting electrode argon arc welding butt welded seam back side that fills silk to carry out the welding of mechanical automation back cover, fill 560MPaHigh-strength steel gas shield welding wire. Welding parameter is: gage of wire 2.0mm, and arc voltage is 26～30V, welding current is 240～280A, controls speed of welding and is advisable so that welding bead surfacing is bright and clean. Protective gas is 100%Ar (argon gas), protective gas streamAmount is 15～22L/min.
In above-mentioned 1200MPa high-strength steel preheating-free combined welding method, not preheating before weldering in whole welding process, postwelding is notCarry out post weld heat treatment. In welding process, need to keep continuous multiple tracks multilayer welding, in welding process, must not interrupt, multiple tracks is manyIn layer mechanical automation welding process, need to keep 100 DEG C～150 DEG C of interlayer temperatures.
Wherein: the described 500MPa level of step (3) gas shield welding wire (Korea S ZO-26 welding wire) preferably diameter is 1.2mm,Its deposited metal composition is by percentage to the quality: C0.02～0.15%, and Si0.55～1.10%, Mn1.40～1.90%, P≤0.030%, S≤0.030%; Deposited metal mechanical property is: tensile strength sigmab490～670MPa, bendsTake intensity σ s >=400MPa, percentage elongation δ >=18%, 0 DEG C of V-notch impact absorbing energy AKV≥47J。
Wherein: the described carbon dioxide purity of step (3) is 99.9%.
Wherein: the described 980MPa high-strength steel of step (4) gas shield welding wire (German UnionX90 welding wire) preferably diameter is1.2mm, its deposited metal composition is by percentage to the quality: C0.1%, Si0.80%, Mn1.80%, Cr0.35%,Ni2.25%, Mo0.60%; Deposited metal mechanical property is: tensile strength sigmab>=900MPa, yield strength σs≥840MPa，Percentage elongation δ 16～19%, V-notch impact absorbing energy A under room temperatureKV70～85J。
Wherein: the described carbon dioxide purity of step (4) is 99.9%.
Wherein: the described 560MPa high-strength steel of step (6) gas shield welding wire (German UnionI52 welding wire) preferably diameter is2.0mm, its deposited metal composition is by percentage to the quality: C0.08%, Si0.85%, Mn1.50%; Deposited goldBelonging to mechanical property is: tensile strength sigmab>=560MPa, yield strength σ s >=450MPa, percentage elongation δ 25～30%, room temperatureLower V-notch impact absorbing energy AKV130～180J。
Wherein: the described protective gas of step (6) and step (7) is the inert gas (argon gas) of purity 99.9%Ar.
The 1200MPa high strength steel welding point that the present invention also provides above-mentioned either method to prepare, in described welding point,The room temperature tensile strength of weld metal is greater than 750MPa, the V-notch impact test of weld metal under-40 DEG C of test temperaturesImpact absorbing energy is greater than 47J.
Not preheating of this 1200MPa high strength steel that the present invention proposes, do not carry out the combination of the mechanical automation of post weld heat treatmentWelding, can obtain surfacing welding point bright and clean and attractive in appearance, weld structure taking tiny acicular ferrite asMain, germinating and the expansion that can effectively resist welding cold cracking. Welding heat affected zone is mainly by the low-carbon (LC) Ma Shi of thin lath-shapedBody composition, intensity and toughness are good. Effectively avoid heat affected area temper softening phenomenon. Adopt this method to obtainThe tensile strength of 1200MPa high-strength steel welding point is 700～900MPa, the V-notch impact absorption of weld metal at 0 DEG CMerit is greater than 47J, can meet its instructions for use.
The mechanical automation combination Welding welding tensile strength that adopts not preheating of the present invention, do not carry out post weld heat treatment1200MPa high strength steel, can obtain smooth welding point, the defects such as flawless, pore; The chamber of weld metalTemperature tensile strength is greater than 750MPa, and under-40 DEG C of test temperatures, the impact absorbing energy of the V-notch impact test of weld metal is largeIn 47J, meet the serviceability requirement of high strength steel welding structural element.
Technical essential of the present invention is embodied in: the specialized for carbon dioxide gas protection weldering of filling " low strong coupling " 500MPa high-strength steel welding wireFor backing run; It is the specialized for carbon dioxide gas protection weldering taking 980MPa high-strength steel welding wire as deposited metal that multiple tracks multilayer is filled weld seam;Capping layer and backing run are the non-melting electrode argon arc welding of filling 560MPa high-strength steel welding wire. In welding process, control heat inputWith 100～150 DEG C of interlayer temperatures. Feature of the present invention is that " low strong coupling " backing run makes weld seam bottom form toughnessGood acicular ferrite structure, improves the toughness of weld seam bottom, and weld seam ultralow-hydrogen low is conducive to reduce crack sensitivity; FillLayer adopts " waiting strong coupling " welding wire machinery automatic welding to enhance productivity, and improves weld strength and toughness; Adopt machineryThe silk filling non-melting electrode argon arc welding capping of automation and backing run can ensure that appearance of weld is smooth bright and clean.
The not preheating that the present invention proposes, the 1200MPa high-strength steel combination Welding that does not carry out post weld heat treatment, can reduce welderingConnect crack sensitivity, bead contour is attractive in appearance and welding joint mechanical property is good. The assembled welding process of this mechanical automationCan reduce production costs, enhance productivity, practical, there is good popularizing application prospect.
Brief description of the drawings
Fig. 1 butt welded joint schematic diagram; Wherein, 1 backing run, 2 filler pass, 3 final pass, 4 back weldingRoad.
Fig. 2 corner connection welding point schematic diagram; Wherein, 1 backing run, 2 filler pass, 3 final pass, 4 back weldingRoad.
Detailed description of the invention
Embodiment 1
Thickness is the 1200MPa high-strength wearable steel butt welding of 16mm. Prime coat and packed layer adopt respectively fills 500MPaWith the carbon dioxide gas arc welding of 980MPa high-strength steel welding wire, capping layer and back cover layer adopt fills the weldering of 560MPa high-strength steelThe silk filling non-melting electrode argon arc welding of silk. Select the good contravariant welding equipment of dynamic characteristic, test piece for welding joint adopts millingMachine-tooled method is opened V-butt, and bevel angle is 50 °, root face 2mm. Adopt hand operated grinding wheel machine polishing groove face and welderingCorrosion and greasy dirt etc. within the scope of the 20mm of joint both sides, make it to expose metallic luster.
(1) adopt carbon dioxide gas arc welding as backing welding, welding material is selected 500MPa high-strength steel gas shield welding wire(Korea S ZO-26 welding wire), deposited metal composition is (wt.%): C0.08% by percentage to the quality, Si0.65%,Mn1.60%, P≤0.030%, S≤0.030%; Deposited metal mechanical property is: tensile strength sigmab490～670MPa，Yield strength σ s >=400MPa, percentage elongation δ >=18%, the V-notch impact absorbing energy A of 0 DEG CKV>=47J. Adopt 100%CO2Gas shield, welding parameter is: gage of wire is 1.2mm, stem elongation degree 30mm, arc voltage 28V, welding current 240A,Sweating heat is input as 12.5kJ/cm, shield gas flow rate 16L/min.
(2) adopt specialized for carbon dioxide gas protection weldering to fill weldering, welding material is selected 980MPa level high-strength steel gas shield welding wire (GermanyUnionX90 welding wire), its deposited metal composition is (wt.%): C0.1% by percentage to the quality, Si0.80%,Mn1.80%, Cr0.35%, Ni2.25%, Mo0.60%; Deposited metal mechanical property is: tensile strength sigmab≥900MPa，Yield strength σ s >=840MPa, percentage elongation δ 16～19%, V-notch impact absorbing energy A under room temperatureKV70～85J. AdoptUse 100%CO2Gas shield, welding parameter is: gage of wire 1.2mm, stem elongation degree 30mm, arc voltage 28V, welderingMeet electric current 280A, sweating heat is input as 16kJ/cm, shield gas flow rate 15L/min, 150 DEG C of interlayer temperatures.
(3) clear up root of weld with carbon arc air gouging, and back of weld is polished flat with hand operated grinding wheel sheet.
(4) adopt the non-melting electrode argon arc welding cosmetic welding that fills silk, welding material is selected 560MPa level high-strength steel gas shield welding wire (moralState UnionI52 welding wire), its deposited metal composition is (wt.%): C0.08% by percentage to the quality, Si0.85%,Mn1.50%; Deposited metal mechanical property is: tensile strength sigmab>=560MPa, yield strength σ s >=450MPa, extendsRate δ 25～30%, V-notch impact absorbing energy A under room temperatureKV130～180J。100％CO2Gas shield, welding parameterFor: gage of wire 2mm, stem elongation degree 30mm, arc voltage 29V, welding current 240A, sweating heat input 16kJ/cm,Shield gas flow rate 20L/min.
(5), after welding complete test plate (panel) front, upset test plate (panel), carries out back cover welding to its back side. Controlling its temperature is130 DEG C, re-use the non-melting electrode argon arc welding that fills silk and carry out back cover welding. Welding wire is selected identical with (4) with welding condition.
Postwelding welding point flat appearance is attractive in appearance, without face crack and root crack. The mechanical property of the welding point obtaining is:Tensile strength is 780MPa, and percentage elongation is that at 13% ,-40 DEG C of temperature, V-notch impact absorbing energy is greater than 47J and (is respectively68J, 76J, 89J), can meet serviceability requirement.
Embodiment 2
Thickness is the 1200MPa high-strength wearable steel of 14mm, the fillet welding joint form of box-structure. Prime coat and packed layerAdopt respectively the carbon dioxide gas arc welding of filling 500MPa and 980MPa high-strength steel welding wire, capping layer and back cover layer adoptFill the silk filling non-melting electrode argon arc welding of 560MPa high-strength steel welding wire. Select the good contravariant welding machine of dynamic characteristic, to diagonal angleJoint test piece for welding joint adopts machine-tooled method to open and cuts 45 ° of chamferings, and the chamfering length of side is 2mm. Adopt hand operated grinding wheel machine andCorrosion and greasy dirt etc. within the scope of brushing groove level welding point both sides 20mm, expose metallic luster.
(1) adopt specialized for carbon dioxide gas protection to weld as backing welding, welding material is selected 500MPa high-strength steel gas shield welding wire (Korea SproState ZO-26 welding wire), deposited metal composition is (wt.%): C0.08% by percentage to the quality, Si0.68%, Mn1.59%,P≤0.030%, S≤0.030%; Deposited metal mechanical property is: tensile strength sigmab490～670MPa, yield strengthσ s >=400MPa, percentage elongation δ >=18%, the V-notch impact absorbing energy A of 0 DEG CKV>=47J. Adopt 100%CO2GasProtection, welding parameter is: gage of wire is 1.2mm, stem elongation degree 30mm, arc voltage 27V, welding current 280A,Sweating heat is input as 13kJ/cm, shield gas flow rate 18L/min.
(2) adopt specialized for carbon dioxide gas protection weldering to fill weldering, welding material is selected 980MPa high-strength steel gas shield welding wire (GermanyUnionX90 welding wire), its deposited metal composition is (wt.%): C0.1% by percentage to the quality, Si0.80%,Mn1.80%, Cr0.35%, Ni2.25%, Mo0.60%; Deposited metal mechanical property is: tensile strength sigmab≥900MPa，Yield strength σ s >=840MPa, percentage elongation δ 16～19%, V-notch impact absorbing energy A under room temperatureKV70～85J. AdoptUse 100%CO2Gas shield, welding parameter is: gage of wire 1.2mm, stem elongation degree 30mm, arc voltage 29V, welderingMeet electric current 320A, sweating heat is input as 18kJ/cm, shield gas flow rate 16L/min, 140 DEG C of interlayer temperatures.
(3) clear up root of weld with carbon arc air gouging, and back of weld is polished flat with hand operated grinding wheel sheet.
(4) adopt the non-melting electrode argon arc welding cosmetic welding that fills silk, welding material is selected 560MPa high-strength steel gas shield welding wire (moralState UnionI52 welding wire), its deposited metal composition is (wt.%): C0.08% by percentage to the quality, Si0.85%,Mn1.50%; Deposited metal mechanical property is: tensile strength sigmab>=560MPa, yield strength σ s >=450MPa, extendsRate δ 25～30%, V-notch impact absorbing energy A under room temperatureKV130～180J. Adopt 100%CO2Gas shield, weldingParameter is: gage of wire 2mm, and stem elongation degree 30mm, arc voltage 28V, welding current 260A, sweating heat input 14kJ/cm,Shield gas flow rate 20L/min.
(5), after welding complete corner connection test plate (panel) front, upset test plate (panel), carries out back cover welding to its back side. Control its temperatureBe 150 DEG C, re-use the non-melting electrode argon arc welding that fills silk and carry out back cover welding. Welding wire is selected and welding condition and (4)Identical.
Postwelding welding point flat appearance is attractive in appearance, without defects such as face cracks. V-notch at weld metal-40 DEG C that obtainImpact absorbing energy AKVBe greater than 47J (being respectively 71J, 88J, 96J), can meet serviceability requirement.
It should be noted that and the foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, although ginsengAccording to previous embodiment, the present invention is had been described in detail, for a person skilled in the art, it still can be to frontState the technical scheme that embodiment records and modify, or part is wherein equal to replacement. Although by reference to the accompanying drawings above-mentionedThe specific embodiment of the present invention is described, but is not limiting the scope of the invention, in technology of the present inventionOn the basis of scheme, those skilled in the art do not need to pay various amendments that creative work can make or distortion still at thisIn the protection domain of invention.
Claims (10)
1. a 1200MPa high strength steel preheating-free combined welding method, is characterized in that,
Groove processing, pretreatment;
Adopt carbon dioxide gas arc welding to carry out backing welding, welding wire is 500MPa welding wire;
Adopt the carbon dioxide gas arc welding of mechanical automation filler wire to fill welding, welding wire is the weldering of 980MPa high-strength steelSilk;
Back chipping;
Non-melting electrode argon arc welding carries out capping layer and back cover layer welds to adopt mechanical automation to fill silk, and welding wire is the weldering of 560MPa high-strength steelSilk.
2. the method for claim 1, is characterized in that, fills in welding process, adopts the welding of multiple tracks multilayer, controlsInterlayer temperature is 100～150 DEG C.
3. the method for claim 1, is characterized in that, in described filling welding process, welding condition is as follows:Gage of wire 1.2mm, arc voltage is 26～30V, welding current is 320～380A, sweating heat input control 10～22kJ/cm, shield gas flow rate is 15～25L/min.
4. the method for claim 1, is characterized in that, in backing welding welding process, welding parameter is gage of wire1.2mm, arc voltage is 26～30V, and welding current is 240～320A, and sweating heat input control, at 15～25kJ/cm, is protectedGas is 100%CO2, shield gas flow rate is 15～20L/min.
5. the method for claim 1, is characterized in that, in cosmetic welding welding process, welding parameter is gage of wire2.0mm, arc voltage is 26～30V, welding current is 240～300A, control speed of welding taking welding bead surfacing bright and clean asSuitable; Protective gas is 100%Ar, and shield gas flow rate is 15～25L/min.
6. the method for claim 1, is characterized in that, in back welding welding process, welding parameter is gage of wire2.0mm, arc voltage is 26～30V, welding current is 240～280A, control speed of welding taking welding bead surfacing bright and clean asSuitable. Protective gas is 100%Ar, and shield gas flow rate is 15～22L/min.
7. the method for claim 1, is characterized in that, the diameter of described 500MPa level gas shield welding wire is 1.2mm,Its deposited metal composition is by percentage to the quality: C0.02～0.15%, and Si0.55～1.10%, Mn1.40～1.90%,P≤0.030%, S≤0.030%; Deposited metal mechanical property is: tensile strength sigmab490～670MPa, yield strengthσ s >=400MPa, percentage elongation δ >=18%, 0 DEG C of V-notch impact absorbing energy AKV≥47J；
Or the diameter of described 980MPa high-strength steel gas shield welding wire is 1.2mm, its deposited metal composition by percentage to the qualityFor: C0.1%, Si0.80%, Mn1.80%, Cr0.35%, Ni2.25%, Mo0.60%; Deposited metal mechanical property is:Tensile strength sigmab>=900MPa, yield strength σs>=840MPa, percentage elongation δ 16～19%, V-notch impact absorption under room temperatureMerit AKV70～85J；
Or the diameter of described 560MPa high-strength steel gas shield welding wire is 2.0mm, its deposited metal composition by percentage to the qualityFor: C0.08%, Si0.85%, Mn1.50%; Deposited metal mechanical property is: tensile strength sigmab>=560MPa, surrender is strongDegree σ s >=450MPa, percentage elongation δ 25～30%, V-notch impact absorbing energy A under room temperatureKV130～180J。
8. the method for claim 1, is characterized in that, described carbon dioxide purity is 99.9%.
9. the method for claim 1, is characterized in that, in described cosmetic welding welding process, protective gas is purityThe inert gas of 99.9%Ar.
10. the 1200MPa high strength steel welding point that prepared by the arbitrary described method of claim 1-9, is characterized in that described welderingIn joint, the room temperature tensile strength of weld metal is greater than 750MPa, and under-40 DEG C of test temperatures, the V-notch of weld metal impactsThe impact absorbing energy of test is greater than 47J.
Priority Applications (1)
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| CN108526664A (en) * | 2018-06-27 | 2018-09-14 | 中国有色金属工业第六冶金建设有限公司 | One kind being suitable for Q460C high-strength steel butt weld welding methods |
| CN109434244A (en) * | 2018-12-29 | 2019-03-08 | 深圳市瑞凌实业股份有限公司 | A kind of Double-wire welding method and system |
| CN110000447A (en) * | 2019-05-17 | 2019-07-12 | 广州黄船海洋工程有限公司 | A kind of not preheating gas protection soldering method of EH36 high strength steel slab |
| CN110153583A (en) * | 2019-05-24 | 2019-08-23 | 南京钢铁股份有限公司 | A method of improving Q890DQP steel welded joint obdurability |
| CN110270745A (en) * | 2019-06-28 | 2019-09-24 | 广东中泽重工有限公司 | A kind of welding method for P690QL1 steel flux-cored wire gas metal-arc welding |
| CN114131159A (en) * | 2021-11-26 | 2022-03-04 | 湖南华菱湘潭钢铁有限公司 | Welding method of ultrahigh-strength steel Q1300E steel plate |
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| CN114131159A (en) * | 2021-11-26 | 2022-03-04 | 湖南华菱湘潭钢铁有限公司 | Welding method of ultrahigh-strength steel Q1300E steel plate |
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