CN102441727A - Gas shielded welding method for hardened and tempered low-alloy high-strength steel - Google Patents
Gas shielded welding method for hardened and tempered low-alloy high-strength steel Download PDFInfo
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Abstract
The invention belongs to the technical field of steel material welding, and relates to a gas shielded welding method for hardened and tempered low-alloy high-strength steel with yield strength not lower than 960MPa. A hardened and tempered low-alloy high-strength steel plate with yield strength not lower than 960MPa is used, the thickness of the hardened and tempered low-alloy high-strength steel plate ranges from 8mm to 30mm, and the hardened and tempered low-alloy high-strength steel plate is formed by combining and butting plates with the same thickness. Mixed gas with 80% of Ar (argon) and 20% of CO2 (carbon dioxide) is used; and a welding wire is composed of 0.08-0.10% of C (carbon), 1.60-2.0% of Mn (manganese), 0.60-0.90% of Si (silicon), 0.015% or less than 0.015% of P (phosphorus), 0.50-0.70% of Mo (molybdenum), 2.1-2.3% of Ni (nickel), 0.30-0.45% of Cr (chromium), the rest Fe (ferrum) and inevitable impurities. During fixed point butt welding and back welding, preheating is performed at the temperature of 125 DEG C before welding, continuous welding is performed, the temperature of filling and cap weld welding beads is higher than or equal to 125 DEG C, and welding heat input quantity is controlled within 1.0-1.35KJ/mm during welding. By the aid of the gas shielded welding method, welding joints can be ensured to have high strength, the high-standard design requirement that the impact toughness of the welding joints is higher than 27J at the temperature of -40 DEG C can be met, welds have excellent crack resistance, the joints have higher impact toughness reserve and safety margin, welding construction conditions are improved, and production cost is reduced.
Description
Technical field
The invention belongs to the ferrous materials welding technology field, relate to the modified low-alloy high-strength steel gas shield welding method that a kind of yield strength is not less than the 960MPa level.
Background technology
Low-alloy steel is on the carbon steel basis, adds some a spot of alloying elements again, reaches raising intensity, and improves its serviceability and one type of engineering structure growing up is used steel.The TMCP technology has been widely used in the production process of low-alloy high-strength steel at present; But for steel, modified heat treatment (quenching+tempering) production technology is still and can not be substituted for the higher key structure spare of the higher cut deal of intensity rank and stability and uniformity requirement.Simultaneously the newly-built modernized heat-treatment lines of domestic Heavy Plate Production enterprise is gone into operation in succession, for the manufacturing of the modified plate of high intensity level high-performance provides the equipment assurance.
Along with construction machinery industry develops to " three high one is big " direction; Market is increasing to the demand of Hi-Stren steel; This just to the demands for higher performance of structural steel, not only will have good comprehensive mechanical properties, and good process industrial art performance and welding performance will be arranged.Yield strength 960MPa level quenched and tempered steel integrates high strength, high tenacity, high life; The use of this rank steel grade will alleviate equipment self-weight effectively and improve the capability efficiency of engineering machinery; Therefore the demand of this steel grade increase trend is obvious; Application promise in clinical practice is arranged, and is that each cut deal producer drops into one of kind of research and development energetically at present.
As welding construction material, give full play to the performance of mother metal, the good welding point of intensity and toughness coupling must be arranged, could effectively improve the reliability and stability of Welding Structure quality.Existing practice shows; According to the alloying principle of steel, generally the intensity along with low-alloy steel improves constantly, and the carbon in its chemical composition and the mass fraction of alloying element also can correspondingly increase; When welding; Cause that easily the embrittlement of joint, the softening crackle that reaches are inclined to a series of Welding Problems such as increase, usually cause Welding Structure to be destroyed, cause heavy economic losses.Therefore; How in actual production, to take the certain process measure; Avoid the weld defect of its welding point that in welding process, exerts an influence, to obtain the high quality welding joint, for the large-scale promotion application of said material in actual production laid good basis; To help promoting the application of steel, thereby promote the core competitiveness of product.
Summary of the invention
Technical problem to be solved by this invention is that the shortcoming to above prior art exists proposes a kind of modified low-alloy high-strength steel gas-shield welding method; Guarantee that welding point has high strength; Welding point-40 ℃ impact flexibility is greater than the high standard designing requirement of 27J, and weld seam has good cracking resistance, and joint has higher impact flexibility deposit and margin of safety; The condition of welding procedure simultaneously improves, and production cost reduces.
The technical scheme that the present invention solves above technical problem is:
A kind of modified low-alloy high-strength steel gas-shield welding method selects for use yield strength to be not less than the modified low-alloy high-strength steel plate of 960MPa, and its thickness is 8mm～30mm, and is identical thickness of slab combination butt joint;
Select Ar gas and CO for use
2Mist is a protective gas, said Ar gas and CO
2Proportioning be (volume ratio): Ar gas: 80%, CO
2: 20%;
Select for use the chemical constituent and the percentage by weight of welding wire to be: C:0.08～0.10%, Mn:1.60～2.0%, Si:0.60～0.90%; P≤0.015%, S≤0.010%, Mo:0.50～0.70%; Ni:2.1～2.3%, Cr:0.30～0.45%, surplus is Fe and unavoidable impurities;
Iron rust, the greasy dirt in weld seam periphery 20mm～50mm scope removed in polishing before the weldering;
When fixing point butt welding and backing welding, carry out 125 ℃ of preheatings before the welding, continuous welding, temperature is more than or equal to 125 ℃ between filling and cap weld welding bead, and the sweating heat input quantity is controlled at 1.0～1.35KJ/mm during welding.
To influence the Thermal Cycle process because the sweating heat input quantity changes, will bring influence to the tissue and the mechanical property of welding joint welding metal and heat affected area thus.The present invention measures and analyzes than v-notch ballistic work tensile property, welding point each position-40 ℃ summer of welding joint welding metal respectively being that the modified low-alloy high-strength steel Q960E gas of 8mm and 30mm is protected the influence of weldering banjo fixing butt jointing mechanical property to thickness of slab under the different sweating heat input quantity conditions.The result shows; The sweating heat input quantity is under 1.0～1.35KJ/mm condition; 8mm, the modified low-alloy high-strength steel Q960E gas that 30mm is thick are protected weldering banjo fixing butt jointing mechanical property welding point tensile strength Rm >=1000 MPa; Joint lateral bending d=6a, 180o is qualified, weld metal, fusion area, the outer ℃ ballistic work AKv >=27J of 1mm place-40 of heat affected area melt run.
The technical scheme that the present invention further limits is:
Aforesaid modified low-alloy high-strength steel gas-shield welding method, the gas shielded arc welding groove adopts asymmetric or symmetrical two-sided X type groove, and bevel angle is 60o, and groove gap is 0～1mm, and root face is 0～1mm.
Aforesaid modified low-alloy high-strength steel gas-shield welding method is characterized in that: when carrying out 125 ℃ of preheatings before the welding, the preheating scope is no less than in each 90mm scope of bevel for welding both sides; Welding current 240～260A, arc voltage 26～28V, speed of welding 33cm/min.
Aforesaid modified low-alloy high-strength steel gas-shield welding method, the chemical constituent of welding wire and percentage by weight are: C:0.08%, Mn:2.0%, Si:0.60%; P:0.015%, S:0.010%, Mo:0.50%; Ni:2.1%, Cr:0.30%, surplus is Fe and unavoidable impurities.
Aforesaid modified low-alloy high-strength steel gas-shield welding method, the chemical constituent of welding wire and percentage by weight are: C:0.10%, Mn:1.60%, Si:0.90%; P:0.012%, S:0.008%, Mo:0.70%; Ni:2.3%, Cr:0.45%, surplus is Fe and unavoidable impurities.
Aforesaid modified low-alloy high-strength steel gas-shield welding method, the chemical constituent of welding wire and percentage by weight are: C:0.09%, Mn:1.80%, Si:0.80%; P:0.010%, S:0.007%, Mo:0.60%; Ni:2.2%, Cr:0.40%, surplus is Fe and unavoidable impurities.
The invention has the beneficial effects as follows: the present invention adopts 80%Ar+20% CO
2Mixed gas arc welding, welding material is according to the welding wire welding of the present invention of low strong matching principle, and weldering is preceding with lower preheating temperature; Postwelding is not heat-treated, and rationally controls the sweating heat input quantity, and making Q960E steel plate welding point weld structure is main with tiny bainite; Welding heat affected zone obtains tempering lath martensitic structure, thereby makes welding point have good obdurability and cracking resistance, and especially the plasticity of welding point and impact flexibility are greatly improved; Guarantee that comprehensive mechanical performance meets design requirement, and the welding process is simple relatively, has improved welding production efficiency; Improve the welding procedure condition, reduce production costs.
The specific embodiment
Embodiment 1
Present embodiment is a kind of modified low-alloy high-strength steel gas-shield welding method, and concrete technology is following:
The yield strength rank that adopts modifier treatment to produce is the high strength steel plate Q960E of 960MPa level, and slab is combined as 30mm+30mm, is of a size of 450mm * 400mm * 30mm;
Select Ar gas and CO for use
2Mist is a protective gas, said Ar gas and CO
2Proportioning be (volume ratio): Ar gas: 80%, CO
2: 20%;
Select for use the chemical constituent and the percentage by weight of welding wire to be: C:0.08%, Mn:2.0%, Si:0.60%, P:0.015%, S:0.010%, Mo:0.50%, Ni:2.1%, Cr:0.30%, surplus is Fe and unavoidable impurities;
The gas shielded arc welding groove adopts asymmetric two-sided X type groove, and bevel angle is 60o, and groove gap is 0～1mm, and root face is 0mm;
With 125 ℃ of Q960E high-strength steel preheatings to be welded, the preheating scope is no less than in each 90mm scope of bevel for welding both sides;
Welding condition: welding current 260A, arc voltage 28V, speed of welding 33cm/min, sweating heat input quantity 1.32KJ/mm; To thickness is that 30mm+30mm combined steel plate gas shielded arc welding banjo fixing butt jointing adopts multilayer multiple tracks continuous sequence, and till weld seam filled up, its weld seam interlayer temperature was not less than 125 ℃.
Through the modified low-alloy high-strength steel Q960E banjo fixing butt jointing mechanical property that adopts above-mentioned welding method welding is detected; Its joint mechanical property is: tensile strength Rm:1030MPa; Fracture position: mother metal, joint clod wash d=6a, 180o is qualified; Weld metal-40 ℃ ballistic work AKv:55J, the outer ℃ ballistic work AKv of 1mm place-40 of melt run and heat affected area melt run is respectively: 40J, 47J.
Embodiment 2
Present embodiment is a kind of modified low-alloy high-strength steel gas-shield welding method, and concrete technology is following:
The yield strength rank that adopts modifier treatment to produce is the high strength steel plate Q960E of 960MPa level, and slab is combined as 8mm+8mm, and test plate (panel) is of a size of 450mm * 400mm * 8mm;
Select Ar gas and CO for use
2Mist is a protective gas, said Ar gas and CO
2Proportioning be (volume ratio): Ar gas: 80%, CO
2: 20%;
Select for use the chemical constituent and the percentage by weight of welding wire to be: C:0.10%, Mn:1.60%, Si:0.90%, P:0.012%, S:0.008%, Mo:0.70%, Ni:2.3%, Cr:0.45%, surplus is Fe and unavoidable impurities;
The gas shielded arc welding groove adopts symmetrical two-sided X type groove, and bevel angle is 60o, and groove gap is 0～1mm, and root face is 1mm;
With 125 ℃ of Q960E high-strength steel preheatings to be welded, the preheating scope is no less than in each 75mm scope of bevel for welding both sides;
Welding condition: welding current 240A, arc voltage 26V, speed of welding 33cm/min, sweating heat input quantity 1.1KJ/cm; To thickness is that 8mm+8mm combined steel plate gas shielded arc welding banjo fixing butt jointing adopts multilayer multiple tracks continuous sequence, and till weld seam filled up, its weld seam interlayer temperature was not less than 125 ℃.
Through the high strength steel plate Q960E banjo fixing butt jointing mechanical property that adopts above-mentioned welding method welding is detected; Its joint mechanical property is: tensile strength Rm:1020MPa; Fracture position: mother metal, joint clod wash d=4a, 180o is qualified; Weld metal-40 ℃ ballistic work AKv:49J, the outer ℃ ballistic work AKv:41J of 1mm place-40 of melt run and heat affected area melt run, 46J.
Embodiment 3
Present embodiment is a kind of modified low-alloy high-strength steel gas-shield welding method, and concrete technology is following:
The yield strength rank that adopts modifier treatment to produce is the high strength steel plate Q960E of 960MPa level, and slab is combined as 15mm+15mm, and test plate (panel) is of a size of 450mm * 400mm * 15mm;
Select Ar gas and CO for use
2Mist is a protective gas, said Ar gas and CO
2Proportioning be (volume ratio): Ar gas: 80%, CO
2: 20%;
Select for use the chemical constituent and the percentage by weight of welding wire to be: C:0.09%, Mn:1.80%, Si:0.80%, P:0.010%, S:0.007%, Mo:0.60%, Ni:2.2%, Cr:0.40%, surplus is Fe and unavoidable impurities;
The gas shielded arc welding groove adopts asymmetric two-sided X type groove, and bevel angle is 60o, and groove gap is 0～1mm, and root face is 0mm;
With 125 ℃ of Q960E high-strength steel preheatings to be welded, the preheating scope is no less than in each 80mm scope of bevel for welding both sides;
Welding condition: welding current 250A, arc voltage 27V, speed of welding 33cm/min, sweating heat input quantity 1.21KJ/cm; To thickness is that 15mm+15mm combined steel plate gas shielded arc welding banjo fixing butt jointing adopts multilayer multiple tracks continuous sequence, and till weld seam filled up, its weld seam interlayer temperature was not less than 125 ℃.
Through the high strength steel plate Q960E banjo fixing butt jointing mechanical property that adopts above-mentioned welding method welding is detected; Its joint mechanical property is: tensile strength Rm:1025MPa; Fracture position: mother metal, joint clod wash d=4a, 180o is qualified; Weld metal-40 ℃ ballistic work AKv:52J, the outer ℃ ballistic work AKv:42J of 1mm place-40 of melt run and heat affected area melt run, 28J.
Except that the foregoing description, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of requirement of the present invention.
Claims (6)
1. modified low-alloy high-strength steel gas-shield welding method is characterized in that:
Select for use yield strength to be not less than the modified low-alloy high-strength steel plate of 960MPa, its thickness is 8mm～30mm, and is identical thickness of slab combination butt joint;
Select Ar gas and CO for use
2Mist is a protective gas, said Ar gas and CO
2Volume proportion be: Ar gas: 80%, CO
2: 20%;
Select for use the chemical constituent and the percentage by weight of welding wire to be: C:0.08～0.10%, Mn:1.60～2.0%, Si:0.60～0.90%; P≤0.015%, S≤0.010%, Mo:0.50～0.70%; Ni:2.1～2.3%, Cr:0.30～0.45%, surplus is Fe and unavoidable impurities;
Iron rust, the greasy dirt in weld seam periphery 20mm～50mm scope removed in polishing before the weldering;
When fixing point butt welding and backing welding, carry out 125 ℃ of preheatings before the welding, continuous welding, temperature is more than or equal to 125 ℃ between filling and cap weld welding bead, and the sweating heat input quantity is controlled at 1.0～1.35KJ/mm during welding.
2. modified low-alloy high-strength steel gas-shield welding method as claimed in claim 1 is characterized in that: the gas shielded arc welding groove adopts asymmetric or symmetrical two-sided X type groove, and bevel angle is 60o, and groove gap is 0～1mm, and root face is 0～1mm.
3. according to claim 1 or claim 2 modified low-alloy high-strength steel gas-shield welding method, it is characterized in that: when carrying out 125 ℃ of preheatings before the welding, the preheating scope is no less than in each 90mm scope of bevel for welding both sides; Welding current 240～260A, arc voltage 26～28V, speed of welding 33cm/min.
4. according to claim 1 or claim 2 modified low-alloy high-strength steel gas-shield welding method, it is characterized in that: the chemical constituent of welding wire and percentage by weight are: C:0.08%, Mn:2.0%; Si:0.60%, P:0.015%, S:0.010%; Mo:0.50%; Ni:2.1%, Cr:0.30%, surplus is Fe and unavoidable impurities.
5. according to claim 1 or claim 2 modified low-alloy high-strength steel gas-shield welding method, it is characterized in that: the chemical constituent of welding wire and percentage by weight are: C:0.10%, Mn:1.60%; Si:0.90%, P:0.012%, S:0.008%; Mo:0.70%; Ni:2.3%, Cr:0.45%, surplus is Fe and unavoidable impurities.
6. according to claim 1 or claim 2 modified low-alloy high-strength steel gas-shield welding method, it is characterized in that: the chemical constituent of welding wire and percentage by weight are: C:0.09%, Mn:1.80%; Si:0.80%, P:0.010%, S:0.007%; Mo:0.60%; Ni:2.2%, Cr:0.40%, surplus is Fe and unavoidable impurities.
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| CN113118597A (en) * | 2021-03-30 | 2021-07-16 | 湖南华菱涟钢特种新材料有限公司 | Welding method of high-strength steel |
| CN115302128A (en) * | 2022-10-12 | 2022-11-08 | 中国科学院金属研究所 | Gippel-grade low-temperature high-toughness consumable electrode gas shielded welding material for ocean engineering and application thereof |
| CN115302128B (en) * | 2022-10-12 | 2022-12-13 | 中国科学院金属研究所 | Gipah-grade low-temperature high-toughness consumable electrode gas shielded welding material for ocean engineering and application thereof |
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