CN112372117A - Large heat input submerged arc welding method for refractory steel with yield strength of 460MPa and thickness of 60mm - Google Patents
Large heat input submerged arc welding method for refractory steel with yield strength of 460MPa and thickness of 60mm Download PDFInfo
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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
- B23K9/00—Arc welding or cutting
- B23K9/235—Preliminary treatment
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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
- B23K35/3073—Fe as the principal constituent with Mn as next major constituent
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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
- B23K9/00—Arc welding or cutting
- B23K9/18—Submerged-arc welding
- B23K9/186—Submerged-arc welding making use of a consumable electrodes
- B23K9/188—Submerged-arc welding making use of a consumable electrodes making use of several electrodes
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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
- B23K9/00—Arc welding or cutting
- B23K9/23—Arc welding or cutting taking account of the properties of the materials to be welded
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Abstract
The invention discloses a high heat input submerged arc welding method for 60mm thick refractory steel with 460MPa grade yield strength, which adopts welding materials matched with 60mm thick refractory structural steel with excellent obdurability; the groove type is a double U-shaped groove; preheating at 100 ℃ before welding, baking the submerged arc welding flux at 150 ℃ for 2h, and combining single-wire backing welding with double-wire filling welding; and welding by adopting multilayer and multi-pass submerged arc welding, and controlling the temperature between welding seam layers to be 80-120 ℃. The invention overcomes the technical barriers of a submerged-arc welding process of the refractory steel with the yield strength of 460MPa grade and the thickness of 60mm under the condition of high heat input of 80-120 kJ/cm, solves the problem that the low-temperature toughness, the room temperature and high-temperature strength and the cold-bending forming performance of a thick-specification refractory steel welding joint are difficult to be considered under the condition of high heat input, achieves the high standard requirement that the impact toughness at the temperature of minus 40 ℃ is higher than 130J, and has excellent toughness matching degree and cold-bending forming performance.
Description
Technical Field
The invention belongs to the field of welding of steel materials, and particularly relates to a large-heat-input submerged-arc welding process for refractory steel with yield strength of 460MPa and thickness of 60 mm.
Background
With the rapid development of high-rise and large-scale public building industries, factors such as the safety, the economy, the appearance of the building structure, the space utilization rate and the like attract wide attention. As a novel steel material, the fire-resistant steel can reduce the use of fire-resistant paint and has the performance advantages of high strength, light weight, fire resistance, shock resistance and the like, so that the fire-resistant steel becomes a preferred material for large fire-resistant building structures in various countries.
Welding is an important technological process in the research and development process of refractory steel, and along with the improvement of the strength of steel, the welding quality requirement of the steel is improved. The welding joint is an important component of a fireproof building structure, the quality of the welding joint directly influences the use safety and reliability of the building structure, the toughness of the joint is determined by the components and the conditions of welding heat circulation and the like, different welding processes can cause different structures of a welding line and a heat affected zone, and the welding heat input is the key for influencing the impact toughness and the strength of the welding joint. The welding seam has high cladding rate and large fusion depth under the condition of large heat input, welding stress, air hole slag inclusion and the like can quickly overflow, and large heat input welding is also generally adopted to improve the welding efficiency especially in the application of thick refractory steel. However, it is worth noting that under the condition of high heat input, coarse pro-eutectoid ferrite is easily generated in weld metal, coarse lath bainite and granular bainite are easily generated in a coarse crystal region, which can cause embrittlement of a refractory steel joint, and meanwhile, softening of two phase regions can affect the strength of the joint, so that the high-temperature performance of the joint is difficult to guarantee, which brings difficulty to welding construction of steel for a refractory structure.
In the existing large heat input welding research of refractory steel, although the welding heat input is up to 120kJ/cm, the thickness specification is generally limited to about 30mm, the highest level is only 420MPa, and the comprehensive mechanical properties (low-temperature toughness, room temperature and high-temperature strength and the like) and the cold-bending forming property of the joint are difficult to be considered simultaneously. In order to ensure various performances of a thick-specification refractory steel welding joint under a large heat input condition, development of high-performance refractory steel, reasonable matching of welding materials and selection of welding process parameters are technical keys, Nanjing Steel Joint Limited company adopts low-carbon, Nb, Mo and other multi-element (micro) alloying technologies, and utilizes precipitation strengthening, solid solution strengthening and fine grain strengthening effects to develop and produce steel for a 60mm thick refractory structure with excellent obdurability and qualified cold bending performance, the physical level is 470-490 MPa of upper yield strength ReH, 580-600 MPa of tensile strength Rm, 20-23% of elongation A, Akv of impact work at 40 ℃ below zero is more than or equal to 300J, RP of plastic elongation at 600 ℃ is more than or equal to 330MPa, meanwhile, normal temperature and high temperature strength of the joint under large heat input (80-120 kJ/cm) are ensured, Akv of low temperature at each part at 40 ℃ is more than or equal to 130J, cold bending forming performance is qualified, and the technology is required to be the highest in the current national same-grade refractory steel, is also the world advanced level.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a large heat input submerged-arc welding process for refractory steel with the yield strength of 460MPa grade and the thickness of 60 mm.
In order to achieve the purpose, the invention specifically adopts the following technical scheme:
a large heat input submerged arc welding method for refractory steel with yield strength of 460MPa and thickness of 60mm is characterized in that:
(1) the welding material matched with the steel for the refractory structure with the thickness of 60mm and excellent obdurability is adopted, the welding wire is marked with BHM-9, the diameter is phi 4mm, the tensile strength is more than or equal to 580MPa, and the flux is marked with XUN 121;
(2) the bevel type is a double U-shaped bevel, the bevel angles of the front bevel and the back bevel are both 20 degrees, and the root part is provided with a truncated edge of 6 mm;
(3) technological parameters of submerged arc welding are as follows: preheating at 100 ℃ before welding, baking the submerged arc welding flux at 150 ℃ for 2h, wherein the single-wire backing welding current is 490-510A, the arc voltage is 29-31V, the welding speed is 500mm/min, and the single-wire backing welding heat input is 18 kJ/cm; the method comprises the following steps of filling double wires with welding current of 650-730A, arc voltage of 30-42V and welding speed of 300mm/min, wherein a direct-current reverse connection power supply is adopted for a front wire, an alternating-current power supply is adopted for a rear wire, the front wire is perpendicular to the surface of a test plate, the rear wire inclines in the opposite welding direction by 15 degrees, the distance between two welding wires is 25-30 mm, and heat input of the filling welding of the double wires is 80-120 kJ/cm; and welding by adopting multilayer and multi-pass submerged arc welding, and controlling the temperature between welding seam layers to be 80-120 ℃.
Preferably, the steel with the thickness of 60mm and excellent obdurability is a low-carbon high-niobium low-molybdenum component system, the upper yield strength ReH is 470-490 MPa, the tensile strength Rm is 580-600 MPa, the elongation A is 20-23%, the impact energy Akv at the temperature of minus 40 ℃ is more than or equal to 300J, and the plastic elongation strength RP at the temperature of 600 ℃ is more than or equal to 330 MPa.
Preferably, the welding wire comprises the following chemical components in percentage by weight: c: 0.05-0.1%, Mn: 1.0-1.5%, Si: 0.3-0.5%, S: less than or equal to 0.003 percent, P: less than or equal to 0.005 percent, Ni: 0.5-0.9%, Mo: 0.3 to 0.7%, and the balance of Fe and unavoidable impurities.
Preferably, the room-temperature tensile strength Rm of the submerged-arc welding joint is more than or equal to 590MPa, the high-temperature tensile strength Rm is more than or equal to 330MPa, and the fracture positions of room-temperature and high-temperature tensile tests are positioned at the base metal; the joint side bending d is 3a, the angle is 180 degrees, and the impact energy Akv is more than or equal to 130J at the positions of 1mm, 2mm and 5mm outside the welding line, the fusion line and the 1/2-thick welding line and the fusion line on the surface layer of the steel plate at minus 40 ℃.
The manufacturing method and the reason of the high heat input submerged arc welding process of the refractory steel with the yield strength of 460MPa and the thickness of 60mm are as follows:
(1) welding material
When selecting welding materials, firstly considering that the strength and the-40 ℃ impact toughness of weld metal are matched with those of a base metal as much as possible, selecting a submerged arc welding wire with the tensile strength Rm of more than or equal to 580MPa, and using welding wires with the chemical components and the weight percentage as follows: c: 0.05-0.1%, Mn: 1.0-1.5%, Si: 0.3-0.5%, S: less than or equal to 0.003 percent, P: less than or equal to 0.005 percent, Ni: 0.5-0.9%, Mo: 0.3 to 0.7%, and the balance of Fe and unavoidable impurities. The formed welding seam has high metal purity by using the sintering agent XUN121 as a welding material, and the welding seam structure mainly comprises fine acicular ferrite and has high toughness.
(2) Preheating temperature for welding
The method is characterized in that a controlled thermal restraint (CTS) test is carried out according to the specification of EN10225-2009 annex G standard and is used for evaluating the hydrogen induced crack sensitivity of a steel welding heat affected zone; performing a welding crack test according to API RP 2Z-2005 standard for evaluating the sensitivity of the root crack of the welding heat affected zone of the butt joint; a surfacing hardness test was carried out according to the provisions of EN10225-2009 appendix F standard for evaluating the welding cold crack tendency of steel. Through different pre-welding preheating temperature tests, the low-temperature preheating of 100 ℃ is determined under the condition of high heat input submerged arc welding constraint of the used refractory steel with the yield strength of 460MPa and the thickness of 60 mm.
(3) Groove form
Compared with other forms of grooves such as X-shaped grooves, V-shaped grooves and the like, the U-shaped grooves are wider in root parts, less in welded metal amount and less in welding deformation, and are more beneficial to weld forming and cost reduction.
(4) Welding heat input
Because the welding heat input directly influences the cost, particularly for thicker specification steel, the lower heat input greatly reduces the multi-layer multi-channel submerged arc welding efficiency to increase the cost, and meanwhile, the welding seam cladding rate is high and the penetration depth is large under the condition of large heat input, and welding stress, air hole slag inclusion and the like can quickly overflow, so the invention researches the structure performance of a 60mm thick refractory steel Q460FRE joint under the condition of large heat input of 80-120 kJ/cm, and measures the room temperature and high temperature tensile property of the joint, the charpy V-shaped notch impact power of each part at-40 ℃ and the cold bending property of the joint.
The invention has the beneficial effects that:
(1) the invention overcomes the technical barriers of a submerged-arc welding process of refractory steel with the yield strength of 460MPa grade and the thickness of 60mm under the condition of high heat input of 80-120 kJ/cm, solves the problem that the low-temperature toughness, the room-temperature strength, the high-temperature strength and the cold-bending forming performance of a thick-specification refractory steel welding joint are difficult to give consideration to at the same time under the condition of high heat input by adopting welding materials and welding process parameters matched with high-performance refractory steel, achieves the high standard requirement that the impact toughness at minus 40 ℃ is higher than 130J, and has excellent strength-toughness matching degree and cold-bending forming performance.
(2) The invention realizes the low-temperature preheating before welding and the heat treatment-free process after welding in the submerged arc welding manufacturing process of the refractory steel Q460FRE with the thickness of 60mm, can achieve the effects of excellent performance of a welding joint and high welding efficiency in the implementation process, has strong practicability, high efficiency, energy conservation and obvious economic benefit, and is suitable for popularization and application of the high-strength refractory steel for high-rise and large-scale public buildings.
Drawings
FIG. 1 is a double U-groove version of the invention.
Detailed Description
The process of the present invention is described in further detail below with reference to specific examples.
Example 1
A large heat input submerged arc welding method for refractory steel with yield strength of 460MPa and thickness of 60mm comprises the following steps:
(1) the steel for the refractory structure with 60mm thickness and excellent obdurability is produced by adopting thermo-mechanical controlled rolling (TMCP), the welding test plate combination is 60mm +60mm, and the test plate size is 800mm (length) x 200mm (width) x 60mm (thickness);
(2) matched welding materials: the welding wire comprises the following chemical components in percentage by weight: c: 0.05-0.1%, Mn: 1.0-1.5%, Si: 0.3-0.5%, S: less than or equal to 0.003 percent, P: less than or equal to 0.005 percent, Ni: 0.5-0.9%, Mo: 0.3 to 0.7%, and the balance of Fe and unavoidable impurities. The welding wire is marked with BHM-9, the diameter is phi 4mm, the tensile strength is more than or equal to 580MPa, and the flux is marked with XUN 121;
(3) and (3) submerged arc welding groove: adopting double U-shaped grooves, wherein the bevel edge angles of the front groove and the back groove are both 20 degrees, and the root part is provided with a truncated edge of 6 mm;
(4) welding technological parameters are as follows: preheating at 100 ℃ before welding; the welding current of the single-wire backing welding is 490-510A, the arc voltage is 29-31V, the welding speed is 500mm/min, and the heat input of the single-wire backing welding is 18 kJ/cm; the method comprises the following steps of filling double wires with welding current of 650-660A, arc voltage of 30-33V and welding speed of 300mm/min, wherein a direct-current reverse connection power supply is adopted for a front wire, an alternating-current power supply is adopted for a rear wire, the front wire is perpendicular to the surface of a test plate, the rear wire inclines in the opposite welding direction by 15 degrees, the distance between two welding wires is 25-30 mm, and the heat input quantity of the filling welding of the double wires is 80 kJ/cm; the flux baking system is 150 ℃ multiplied by 2 h; and (3) adopting multilayer multi-pass submerged arc welding for the butt joint of the combined steel plate with the thickness of 60mm +60mm, and controlling the temperature between welding seam layers to be 80-120 ℃.
Example 2
A large heat input submerged arc welding method for refractory steel with yield strength of 460MPa and thickness of 60mm comprises the following steps:
(1) the steel for the refractory structure with 60mm thickness and excellent obdurability is produced by adopting thermo-mechanical controlled rolling (TMCP), the welding test plate combination is 60mm +60mm, and the test plate size is 800mm (length) x 200mm (width) x 60mm (thickness);
(2) matched welding materials: the welding wire comprises the following chemical components in percentage by weight: c: 0.05-0.1%, Mn: 1.0-1.5%, Si: 0.3-0.5%, S: less than or equal to 0.003 percent, P: less than or equal to 0.005 percent, Ni: 0.5-0.9%, Mo: 0.3 to 0.7%, and the balance of Fe and unavoidable impurities. The welding wire is marked with BHM-9, the diameter is phi 4mm, the tensile strength is more than or equal to 580MPa, and the flux is marked with XUN 121;
(3) and (3) submerged arc welding groove: adopting double U-shaped grooves, wherein the bevel edge angles of the front groove and the back groove are both 20 degrees, and the root part is provided with a truncated edge of 6 mm;
(4) welding technological parameters are as follows: preheating at 100 ℃ before welding; the welding current of the single-wire backing welding is 490-510A, the arc voltage is 29-31V, the welding speed is 500mm/min, and the heat input of the single-wire backing welding is 18 kJ/cm; the double-wire filling welding current is 700-710A, the arc voltage is 34-36V, and the welding speed is 300mm/min, wherein the front wire adopts a direct-current reverse connection power supply, the rear wire adopts an alternating-current power supply, the front wire is vertical to the surface of a test plate, the rear wire inclines 15 degrees in the opposite direction of welding, the distance between the two welding wires is 25-30 mm, and the double-wire filling welding heat input is 100 kJ/cm; the flux baking system is 150 ℃ multiplied by 2 h; and (3) adopting multilayer multi-pass submerged arc welding for the butt joint of the combined steel plate with the thickness of 60mm +60mm, and controlling the temperature between welding seam layers to be 80-120 ℃.
Example 3
A large heat input submerged arc welding method for refractory steel with yield strength of 460MPa and thickness of 60mm comprises the following steps:
(1) the steel for the refractory structure with 60mm thickness and excellent obdurability is produced by adopting thermo-mechanical controlled rolling (TMCP), the welding test plate combination is 60mm +60mm, and the test plate size is 800mm (length) x 200mm (width) x 60mm (thickness);
(2) matched welding materials: the welding wire comprises the following chemical components in percentage by weight: c: 0.05-0.1%, Mn: 1.0-1.5%, Si: 0.3-0.5%, S: less than or equal to 0.003 percent, P: less than or equal to 0.005 percent, Ni: 0.5-0.9%, Mo: 0.3 to 0.7%, and the balance of Fe and unavoidable impurities. The welding wire is marked with BHM-9, the diameter is phi 4mm, the tensile strength is more than or equal to 580MPa, and the flux is marked with XUN 121;
(3) and (3) submerged arc welding groove: adopting double U-shaped grooves, wherein the bevel edge angles of the front groove and the back groove are both 20 degrees, and the root part is provided with a truncated edge of 6 mm;
(4) welding technological parameters are as follows: preheating at 100 ℃ before welding; the welding current of the single-wire backing welding is 490-510A, the arc voltage is 29-31V, the welding speed is 500mm/min, and the heat input of the single-wire backing welding is 18 kJ/cm; the method comprises the following steps of filling welding current 710-720A with double wires, arc voltage 37-39V and welding speed 300mm/min, wherein a direct-current reverse connection power supply is adopted for a front wire, an alternating-current power supply is adopted for a rear wire, the front wire is perpendicular to the surface of a test plate, the rear wire inclines in the opposite direction of welding by 15 degrees, the distance between two welding wires is 25-30 mm, and the heat input quantity of filling welding with double wires is 110 kJ/cm; the flux baking system is 150 ℃ multiplied by 2 h; and (3) adopting multilayer multi-pass submerged arc welding for the butt joint of the combined steel plate with the thickness of 60mm +60mm, and controlling the temperature between welding seam layers to be 80-120 ℃.
Example 4
A large heat input submerged arc welding method for refractory steel with yield strength of 460MPa and thickness of 60mm comprises the following steps:
(1) the steel for the refractory structure with 60mm thickness and excellent obdurability is produced by adopting thermo-mechanical controlled rolling (TMCP), the welding test plate combination is 60mm +60mm, and the test plate size is 800mm (length) x 200mm (width) x 60mm (thickness);
(2) matched welding materials: the welding wire comprises the following chemical components in percentage by weight: c: 0.05-0.1%, Mn: 1.0-1.5%, Si: 0.3-0.5%, S: less than or equal to 0.003 percent, P: less than or equal to 0.005 percent, Ni: 0.5-0.9%, Mo: 0.3 to 0.7%, and the balance of Fe and unavoidable impurities. The welding wire is marked with BHM-9, the diameter is phi 4mm, the tensile strength is more than or equal to 580MPa, and the flux is marked with XUN 121;
(3) and (3) submerged arc welding groove: adopting double U-shaped grooves, wherein the bevel edge angles of the front groove and the back groove are both 20 degrees, and the root part is provided with a truncated edge of 6 mm;
(4) welding technological parameters are as follows: preheating at 100 ℃ before welding; the welding current of the single-wire backing welding is 490-510A, the arc voltage is 29-31V, the welding speed is 500mm/min, and the heat input of the single-wire backing welding is 18 kJ/cm; 720-730A of double-wire filling welding current, 40-42V of arc voltage and 300mm/min of welding speed, wherein the front wire adopts a direct-current reverse connection power supply, the rear wire adopts an alternating-current power supply, the front wire is vertical to the surface of a test plate, the rear wire inclines in the opposite direction of welding by 15 degrees, the distance between the two welding wires is 25-30 mm, and the heat input quantity of the double-wire filling welding is 120 kJ/cm; the flux baking system is 150 ℃ multiplied by 2 h; and (3) adopting multilayer multi-pass submerged arc welding for the butt joint of the combined steel plate with the thickness of 60mm +60mm, and controlling the temperature between welding seam layers to be 80-120 ℃.
After the refractory steel Q460FRE with the thickness of 60mm is subjected to submerged arc welding by the welding method of the above embodiments 1 to 4, the performance of the welded joint is detected. The room temperature tensile properties and cold bending properties of the welded joints are shown in Table 1, the impact properties are shown in Table 2, and the high temperature tensile properties are shown in Table 3.
TABLE 1 tensile and Cold bending Properties of welded joints
TABLE 2 impact properties of the weld joints
TABLE 3 high temperature tensile Properties of welded joints
Therefore, the welding joints obtained in the embodiments 1 to 4 have excellent comprehensive mechanical properties, have good strength and toughness matching degree at room temperature, and simultaneously ensure higher high-temperature strength and qualified cold-bending forming performance. The tensile strength Rm of the joint at room temperature is more than or equal to 590MPa, the average value Akv of the impact energy at-40 ℃ is more than or equal to 130J, and the tensile strength Rm at high temperature of 600 ℃ is more than or equal to 330 MPa.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (6)
1. A large heat input submerged arc welding method for refractory steel with yield strength of 460MPa and thickness of 60mm is characterized in that:
(1) the welding material matched with the steel for the refractory structure with the thickness of 60mm and excellent obdurability is adopted, the welding wire is marked with BHM-9, the diameter is phi 4mm, the tensile strength is more than or equal to 580MPa, and the flux is marked with XUN 121;
(2) the bevel type is a double U-shaped bevel, the bevel angles of the front bevel and the back bevel are both 20 degrees, and the root part is provided with a truncated edge of 6 mm;
(3) technological parameters of submerged arc welding are as follows: preheating at 100 ℃ before welding, baking the submerged arc welding flux at 150 ℃ for 2h, wherein the single-wire backing welding current is 490-510A, the arc voltage is 29-31V, the welding speed is 500mm/min, and the single-wire backing welding heat input is 18 kJ/cm; the method comprises the following steps of filling double wires with welding current of 650-730A, arc voltage of 30-42V and welding speed of 300mm/min, wherein a direct-current reverse connection power supply is adopted for a front wire, an alternating-current power supply is adopted for a rear wire, the front wire is perpendicular to the surface of a test plate, the rear wire inclines in the opposite welding direction by 15 degrees, the distance between two welding wires is 25-30 mm, and heat input of the filling welding of the double wires is 80-120 kJ/cm; and welding by adopting multilayer and multi-pass submerged arc welding, and controlling the temperature between welding seam layers to be 80-120 ℃.
2. The submerged arc welding method with high heat input for the refractory steel with yield strength of 460MPa grade and thickness of 60mm as claimed in claim 1, characterized in that the steel with yield strength of 460MPa grade and thickness of 60mm is a low-carbon high-niobium low-molybdenum component system, the steel with yield strength of 60mm is with upper yield strength ReH 470-490 MPa, tensile strength Rm 580-600 MPa, elongation A20-23%, impact energy Akv at-40 ℃ is not less than 300J, and plastic elongation strength RP0.2 at 600 ℃ is not less than 330 MPa.
3. The large heat input submerged arc welding method for refractory steel with yield strength of 460MPa grade and thickness of 60mm as claimed in claim 1, characterized in that the chemical components and weight percentage of the welding wire are as follows: c: 0.05-0.1%, Mn: 1.0-1.5%, Si: 0.3-0.5%, S: less than or equal to 0.003 percent, P: less than or equal to 0.005 percent, Ni: 0.5-0.9%, Mo: 0.3 to 0.7%, and the balance of Fe and unavoidable impurities.
4. The large heat input submerged arc welding method for refractory steel with yield strength of 460MPa grade and thickness of 60mm as claimed in claim 1, characterized in that the tensile strength Rm at room temperature of the submerged arc welding joint is not less than 590MPa, the tensile strength Rm at high temperature is not less than 330MPa, and the fracture positions of the room temperature and high temperature tensile tests are at the base material; the joint side bending d =3a, 180 degrees is qualified, and the impact energy Akv is more than or equal to 130J at the positions of 1mm, 2mm and 5mm outside the welding line, the fusion line and the 1/2-thick welding line and the fusion line on the surface layer of the steel plate at minus 40 ℃.
5. The submerged arc welding method with large heat input for refractory steel with yield strength of 460MPa grade and thickness of 60mm as claimed in claim 1, characterized in that the heat input for refractory steel is 80-120 kJ/cm.
6. The large heat input submerged arc welding method for refractory steel with yield strength of 460MPa grade and thickness of 60mm according to claim 1, characterized in that Q460FRE steel plate with thickness of 60mm is adopted for combined butt joint.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113857620A (en) * | 2021-10-25 | 2021-12-31 | 天津新松机器人自动化有限公司 | Robot double-wire welding method |
| WO2022267149A1 (en) * | 2021-06-23 | 2022-12-29 | 南京钢铁股份有限公司 | 460 mpa-grade all-position gas shielded welding wire for building resistant to secondary fire and manufacturing method |
| WO2023029279A1 (en) * | 2021-09-01 | 2023-03-09 | 南京钢铁股份有限公司 | Multi-wire submerged arc welding method for q370qe thick plate |
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| WO2023029279A1 (en) * | 2021-09-01 | 2023-03-09 | 南京钢铁股份有限公司 | Multi-wire submerged arc welding method for q370qe thick plate |
| CN113857620A (en) * | 2021-10-25 | 2021-12-31 | 天津新松机器人自动化有限公司 | Robot double-wire welding method |
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