CN102441727B - 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 ferrous materials welding technology field, relate to a kind of yield strength and be not less than the modified low-alloy high-strength steel gas shield welding method of 960MPa level.
Background technology
Low-alloy steel is on carbon steel basis, then adds some a small amount of alloying elements, reaches raising intensity, and improves its serviceability and the class Kind of Steels Used in Engineering Structures that grows up.TMCP technology has been widely used in the production process of low-alloy high-strength steel at present, but with for steel, modified heat treatment (quenching+tempering) production technology is still and can not be substituted for the higher cut deal of intensity rank and stability and the higher key structure part of uniformity requirement.The newly-built modernization heat-treatment lines of Domestic Plate manufacturing enterprise is gone into operation in succession simultaneously, guarantees for the manufacture of the modified plate of high intensity level high-performance provides equipment.
Along with construction machinery industry is to " three high one large " future development, market is increasing to the demand of Hi-Stren steel, this just has higher requirement to the performance of structural steel, not only will have good comprehensive mechanical property, and will have good process industrial art performance and welding performance.Yield strength 960MPa level quenched and tempered steel integrates high strength, high tenacity, high life, the use of this rank steel grade will effectively alleviate equipment self-weight and improve the capability efficiency of engineering machinery, therefore the demand of this steel grade increase trend is obvious, having good application prospect, is that current each cut deal producer drops into one of kind of research and development energetically.
As welding construction material, give full play to the performance of mother metal, must there be intensity and toughness to mate good welding point, could effectively improve the reliability and stability of Welding Structure quality.Existing practice shows, according to the alloying principle of steel, general along with the intensity of low-alloy steel improves constantly, carbon in its chemical composition and the mass fraction of alloying element also can correspondingly increase, in the time of welding, easily cause a series of Welding Problems such as the embrittlement of joint, softening and crackle tendency increase, usually cause Welding Structure to be destroyed, cause heavy economic losses.Therefore, how in actual production, to take certain technological measure, avoid the weld defect of its welding point that exerts an influence in welding process, to obtain high-quality welding point, for the large-scale promotion application of such material in actual production laid good basis, to be conducive to promote the application of steel, thus the core competitiveness of improving product.
Summary of the invention
Technical problem to be solved by this invention is; the shortcoming existing for above prior art; a kind of modified low-alloy high-strength steel gas-shield welding method is proposed; guarantee that welding point has high strength; welding point-40 ℃ impact flexibility is greater than the design 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 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 docking;
Select Ar gas and CO
2mist is protective gas, described Ar gas and CO
2proportioning be (volume ratio): Ar gas: 80%, CO
2: 20%;
Select 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 inevitable impurity;
Before weldering, iron rust, the greasy dirt within the scope of weld seam periphery 20mm～50mm removed in polishing;
When fixing point butt welding and backing welding, before welding, carry out 125 ℃ of preheatings, continuous welding, between filling and cap weld welding bead, temperature is more than or equal to 125 ℃, and when welding, sweating heat input control is at 1.0～1.35KJ/mm.
To affect Thermal Cycle process because sweating heat input quantity changes, thus the tissue of Welded Joints weld metal and heat affected area and mechanical property be brought to impact.The present invention protects the impact of weldering banjo fixing butt jointing mechanical property on the modified low-alloy high-strength steel Q960E gas that is 8mm and 30mm on thickness of slab under different sweating heat input quantity conditions, the tensile property of Welded Joints weld metal, each position-40 of welding point ℃ summer are measured and analyze than v-notch ballistic work respectively.Result shows, sweating heat input quantity is under 1.0～1.35KJ/mm condition, the modified low-alloy high-strength steel Q960E gas that 8mm, 30mm are thick is 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 1mm place-40 ℃ ballistic work AKv >=27J 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, 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: while carrying out 125 ℃ of preheatings before welding, pre-heat rating is no less than within the scope of the each 90mm in 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 inevitable impurity.
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 inevitable impurity.
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 inevitable impurity.
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, weldering is front with lower preheating temperature, postwelding is not heat-treated, rationally control sweating heat input quantity, make Q960E Plate Welding joint welding metal structure take tiny bainite as main, welding heat affected zone obtains tempering lath martensitic structure, thereby make welding point there is good obdurability and cracking resistance, especially the plasticity of welding point and impact flexibility are greatly improved, guarantee that comprehensive mechanical performance meets design requirement, and welding process is relatively simple, improve welding production efficiency, improve welding procedure condition, reduce production costs.
The specific embodiment
embodiment 1
The present embodiment is a kind of modified low-alloy high-strength steel gas-shield welding method, and concrete technology is as follows:
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
2mist is protective gas, described Ar gas and CO
2proportioning be (volume ratio): Ar gas: 80%, CO
2: 20%;
Select 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 inevitable impurity;
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;
By 125 ℃ of Q960E high-strength steel preheatings to be welded, pre-heat rating is no less than within the scope of the each 90mm in 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; Be that 30mm+30mm combined steel plate gas shielded arc welding banjo fixing butt jointing adopts multilayer multiple tracks continuous sequence to thickness, until weld seam fills up, its weld seam interlayer temperature is 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 1mm place-40 ℃ ballistic work AKv of melt run and heat affected area melt run is respectively: 40J, 47J.
embodiment 2
The present embodiment is a kind of modified low-alloy high-strength steel gas-shield welding method, and concrete technology is as follows:
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
2mist is protective gas, described Ar gas and CO
2proportioning be (volume ratio): Ar gas: 80%, CO
2: 20%;
Select 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 inevitable impurity;
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;
By 125 ℃ of Q960E high-strength steel preheatings to be welded, pre-heat rating is no less than within the scope of the each 75mm in 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; Be that 8mm+8mm combined steel plate gas shielded arc welding banjo fixing butt jointing adopts multilayer multiple tracks continuous sequence to thickness, until weld seam fills up, its weld seam interlayer temperature is 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 1mm of melt run and heat affected area melt run place-40 ℃ ballistic work AKv:41J, 46J.
embodiment 3
The present embodiment is a kind of modified low-alloy high-strength steel gas-shield welding method, and concrete technology is as follows:
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
2mist is protective gas, described Ar gas and CO
2proportioning be (volume ratio): Ar gas: 80%, CO
2: 20%;
Select 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 inevitable impurity;
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;
By 125 ℃ of Q960E high-strength steel preheatings to be welded, pre-heat rating is no less than within the scope of the each 80mm in 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; Be that 15mm+15mm combined steel plate gas shielded arc welding banjo fixing butt jointing adopts multilayer multiple tracks continuous sequence to thickness, until weld seam fills up, its weld seam interlayer temperature is 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 1mm of melt run and heat affected area melt run place-40 ℃ ballistic work AKv:42J, 28J.
In addition to the implementation, 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. a modified low-alloy high-strength steel gas-shield welding method, is characterized in that:
Select yield strength to be not less than the modified low-alloy high-strength steel plate Q960E of 960MPa, its thickness is 8mm～30mm, and is identical thickness of slab combination docking;
Select Ar gas and CO
2mist is protective gas, described Ar gas and CO
2volume proportion be: Ar gas: 80%, CO
2: 20%;
Select 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 inevitable impurity;
Before weldering, iron rust, the greasy dirt within the scope of weld seam periphery 20mm～50mm removed in polishing;
When fixing point butt welding and backing welding, before welding, carry out 125 ℃ of preheatings, continuous welding, between filling and cap weld welding bead, temperature is more than or equal to 125 ℃, and when welding, sweating heat input control is at 1.0～1.35KJ/mm.
2. modified low-alloy high-strength steel gas-shield welding method as claimed in claim 1, is characterized in that: 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. modified low-alloy high-strength steel gas-shield welding method as claimed in claim 1 or 2, is characterized in that: while carrying out 125 ℃ of preheatings before welding, pre-heat rating is no less than the each 90mm scope in bevel for welding both sides; Welding current 240～260A, arc voltage 26～28V, speed of welding 33cm/min.
4. modified low-alloy high-strength steel gas-shield welding method as claimed in claim 1 or 2; 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 inevitable impurity.
5. modified low-alloy high-strength steel gas-shield welding method as claimed in claim 1 or 2; 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 inevitable impurity.
6. modified low-alloy high-strength steel gas-shield welding method as claimed in claim 1 or 2; 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 inevitable impurity.
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| CN102441727B true CN102441727B (en) | 2014-05-28 |
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