CN110666297A - Single-side welding butt joint method for 810 MPa-grade high-performance weather-resistant bridge steel composite weld joint liner - Google Patents
Single-side welding butt joint method for 810 MPa-grade high-performance weather-resistant bridge steel composite weld joint liner Download PDFInfo
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- CN110666297A CN110666297A CN201910839823.6A CN201910839823A CN110666297A CN 110666297 A CN110666297 A CN 110666297A CN 201910839823 A CN201910839823 A CN 201910839823A CN 110666297 A CN110666297 A CN 110666297A
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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
- B23K9/16—Arc welding or cutting making use of shielding gas
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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
Abstract
The invention discloses a 810 MPa-grade high-performance weather-proof bridge steel composite welding line liner single-side welding butt joint method, which belongs to the technical field of large-span, heavy-load, high-strength, high-toughness and high-weather-proof bridge steel welding, and adopts the technical scheme that a base material of bridge steel with the tensile strength of more than or equal to 810MPa is adopted, and the mechanical property characteristics are as follows: the yield strength ReL is more than or equal to 690MPa, the tensile strength Rm is more than or equal to 810MPa, the elongation A is more than or equal to 14 percent, and the impact energy KV2 at minus 40 ℃ is more than or equal to 120J; the bevel adopts a single-side V-shaped bevel, the bevel angle is 40 degrees, and the gap is 6 mm; firstly, assembling by adopting a code plate, arranging a ceramic liner on the back surface of the gap, bottoming by adopting gas shielded welding for three layers of joints, and then carrying out submerged arc automatic welding to fill the cover surface. The invention adopts a single-side welding butt joint method of composite welding ceramic liner, the groove size is 40 degrees, the filling amount of deposited metal of the welding line is reduced, the heat affected zone range of the welding line is reduced, and the performance of the joint is improved; the method realizes the 810MPa grade high-performance weather-resistant bridge steel, the preheating before welding is 80-100 ℃, the heat treatment is not carried out after welding, and the obtained welding line is well formed.
Description
Technical Field
The invention relates to the technical field of manufacturing and welding of thick plates of large-span and heavy-load bridges, in particular to a single-side welding butt joint method for a 810 MPa-grade high-performance weather-resistant bridge steel composite weld joint liner.
Background
The seven bridge in Jianghhan proposed in China is a bidirectional 6-lane highway bridge, and the main bridge of the seven bridge is a heavy-load highway bridge with the span of 408 meters. In order to meet the requirement of high strength, large span, heavy load and high speed development of bridge construction in China, BaoWu group develops a new generation of high strength, high toughness and high weather resistance bridge steel Q690qENH for the bridge in China, the comprehensive mechanical property of the steel reaches the level of foreign similar steel types, and particularly, the low-temperature impact toughness and the weather resistance are greatly improved while the strength is improved. The improvement of the performance of the base material puts urgent demands on the welding material and the welding process matched with the base material. Therefore, if the problems of weldability, matching welding materials and welding process of the high-performance weather-resistant bridge steel are not solved timely and effectively, the popularization and application of the bridge steel and new steel types in China are directly hindered. The method accelerates the development of the welding process of the steel for the large-span and heavy-load bridge and the research of the matched welding materials, and has great economic benefit and social benefit for the popularization and the application of the steel for the bridge in the manufacturing technology of the large-span, heavy-load and high-weather-resistance thick plate bridge structure in China.
The document of Chinese patent No. CN201210287003.9 discloses a composite welding method for LYR690 steel with high strength and low yield ratio. LYR690 steel with tensile strength Rm of more than or equal to 690MPa, yield strength ReL of more than or equal to 500MPa, yield ratio of 0.70-0.71, elongation A of more than or equal to 18% and ballistic work of-40 ℃ KV2 of more than or equal to 120J is adopted; the thickness of the welding rod is 40mm, and the welding rod is in combined butt-joint composite welding with the same plate thickness; the composite welding groove adopts a double-sided asymmetric X groove, the angle of the groove is 60 degrees, and the truncated edge is 1 mm; the tensile strength of the matched welding wires is more than or equal to 700 MPa; firstly, argon-rich gas shielded welding is adopted to carry out 6-7 times of continuous welding on the front side and the back side of the double-sided asymmetric groove respectively, the welding current is 265-270A, the welding voltage is 27-28V, the welding speed is 29-28 cm/min, the welding line energy is 15-16 kJ/cm, the argon-rich gas flow is 18-19L/min, then submerged arc welding is adopted, 4-5 times of continuous welding are carried out on the front side and the back side respectively until the welding line is filled, the diameter of a submerged arc welding wire is phi 4.0mm, the welding current is 550-560A, the welding voltage is 31V, the welding speed is 35cm/min, and the welding line energy is 29-30 kJ/cm; the interlayer temperature is controlled to be 120-150 ℃. The document has the following defects: weld deposit metal fill causes a large heat affected zone of the weld, reducing the performance of the joint.
Therefore, a 810 MPa-grade high-performance weather-resistant bridge steel composite weld joint liner single-side welding butt joint method is provided.
Disclosure of Invention
The invention mainly aims to provide a single-side welding butt joint method for a 810 MPa-grade high-performance weather-proof bridge steel composite weld joint liner, so as to solve the problems in the background technology.
In order to realize the purpose, the invention provides a single-side welding butt joint method for a 810 MPa-grade high-performance weather-proof bridge steel composite weld joint liner, which comprises the following steps:
1) the bridge steel with the tensile strength of more than or equal to 810MPa is adopted, and the mechanical property characteristics are as follows: the yield strength ReL is more than or equal to 690MPa, the tensile strength Rm is more than or equal to 810MPa, the elongation A is more than or equal to 14 percent, and the impact energy KV at the temperature of minus 40 DEG C2≥120J；
2) The bevel adopts a single-side V-shaped bevel, the bevel angle is 40 degrees, and the gap is 6 mm;
3) assembling by using a code plate, and arranging a ceramic liner on the back of the gap;
4) the welding process comprises the following steps:
a) the joint adopts three layers of gas shielded welding for priming, the interlayer temperature is controlled to be 150-180 ℃, the welding current is 250A, the welding voltage is 28V, the welding speed is 30cm/min, the welding line energy is 14KJ/cm, and 20 percent of CO by volume is adopted2The argon-rich gas with 80% of Ar is used as protective gas, and welding is carried out under the condition that the flow rate is controlled to be 20-25L/min;
b) filling the cover surface by performing submerged arc automatic welding, controlling the interlayer temperature to be 150-180 ℃, matching with a preferred welding flux, and then ensuring that the tensile strength of deposited metal is more than 810MPa and the diameter phi of a welding wire is 4.0 mm;
wherein, the welding current of the submerged automatic arc welding is 650A, the welding voltage is 31V, the welding speed is 40cm/min, and the welding line energy is 30 KJ/cm.
Furthermore, the tensile strength of the gas shielded welding wire is more than 810MPa, and the diameter of the gas shielded welding wire is phi 1.2 mm.
Further, the bevel is provided with a 2mm blunt edge.
The steel grade of the invention is improved from the prior Q370qE, Q420qE and Q500qE to Q690qE, the steel is preheated to 80-100 ℃ before welding, a heat treatment process is not carried out after welding, a large number of welding materials selected by tests and welding process parameters are matched, flaw detection is carried out, no welding defect is found, a welding joint has excellent low-temperature toughness, crack resistance and weather resistance, the-40 ℃ KV2 impact power of each area of the joint reaches 108-230J, the-40 ℃ KV2 of each area of the butt joint of bridge steel is far higher than the standard of not less than 47J welding performance, the joint has higher impact toughness reserve and safety margin, and the key technical requirements of large-span bridge steel structure manufacturing can be completely met.
By applying the technical scheme of the invention, the beneficial effects are as follows:
1. the single-side welding composite welding butt-joint process method for the bridge steel liner with the tensile strength of more than or equal to 810MPa, high strength, high toughness and high weather resistance meets the key welding process manufacturing technology of composite welding of a steel structure of seven bridges in Jianghan, proposed in China. The joint has excellent low-temperature toughness, crack resistance and weather resistance, and each area of the joint has higher impact toughness storage and safety margin;
2. the joint adopts a groove design of 40 degrees, the backing welding adopts gas shielded welding, the dry elongation of a welding wire can reach the bottom, the backing welding can be ensured, the groove angle is small, the filling amount of deposited metal of a welding line is small, the weakest heat affected zone of the welding line is small, and the performance of the joint is optimized;
3. by adopting the welding process technology, the superheat zone of the joint is mainly a bainite structure, and the weld metal is mainly a fine acicular ferrite structure, so that the weld has excellent low-temperature impact toughness, and the joint has excellent crack resistance, weather resistance and excellent comprehensive mechanical properties;
4. the gas shielded welding bottoming and submerged arc welding filling cover surface composite welding process technology realizes a welding process of preheating at 80-100 ℃ before welding in the manufacturing process of the high-strength bridge steel thick plate structure and not carrying out heat treatment after welding, and a joint has excellent crack resistance, weather resistance and comprehensive mechanical properties when multilayer and multi-channel continuous welding is adopted.
The welding process has excellent welding process performance, is simple and convenient to operate, is suitable, convenient, efficient and energy-saving, is suitable for manufacturing, popularizing and applying large-span bridge steel thick plates in factories, and meets the matched welding technical requirements of new-generation high-strength, high-toughness and high-weather-resistance bridge steel in China.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 shows a 32mm +32mm joint groove structure diagram of a 810 MPa-grade high-performance weather-proof bridge steel composite weld joint liner single-side welding butt joint method;
FIG. 2 shows a structure diagram of a 50mm +50mm joint groove of a 810 MPa-grade high-performance weather-proof bridge steel composite weld joint liner single-side welding butt joint method.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in figures 1 to 2, the invention provides a 810 MPa-grade high-performance weather-proof bridge steel composite weld joint liner single-side welding butt joint method, which comprises the following steps:
1) the bridge steel with the tensile strength of more than or equal to 810MPa is adopted, and the mechanical property characteristics are as follows: the yield strength ReL is more than or equal to 690MPa, the tensile strength Rm is more than or equal to 810MPa, the elongation A is more than or equal to 14 percent, and the impact energy KV at the temperature of minus 40 DEG C2≥120J；
2) The bevel adopts a single-side V-shaped bevel, the bevel angle is 40 degrees, and the gap is 6 mm;
3) assembling by using a code plate, and arranging a ceramic liner on the back of the gap;
4) the welding process comprises the following steps:
a) the joint adopts three layers of gas shielded welding for priming, the interlayer temperature is controlled to be 150-180 ℃, the welding current is 250A, the welding voltage is 28V, the welding speed is 30cm/min, the welding line energy is 14KJ/cm, and 20 percent of CO by volume is adopted2The argon-rich gas with 80% of Ar is used as protective gas, and welding is carried out under the condition that the flow rate is controlled to be 20-25L/min;
b) filling the cover surface by performing submerged arc automatic welding, controlling the interlayer temperature to be 150-180 ℃, matching with a preferred welding flux, and then ensuring that the tensile strength of deposited metal is more than 810MPa and the diameter phi of a welding wire is 4.0 mm;
wherein, the welding current of the submerged automatic arc welding is 650A, the welding voltage is 31V, the welding speed is 40cm/min, and the welding line energy is 30 KJ/cm.
Preferably, the gas shielded welding wire has a tensile strength > 810MPa and a diameter of 1.2 mm.
In the single-side welding butt joint method, the joint adopts a groove design of 40 degrees, backing welding adopts gas shielded welding, the dry elongation of a welding wire can reach the bottom, backing welding can be ensured, the groove angle is small, the filling amount of deposited metal of a welding seam is small, the weakest heat affected zone of the welding seam is small, and the performance of the joint is optimized.
Specifically, the groove is provided with 2mm blunt edges, so that the assembly is rapid, and accurate welding is facilitated.
Example 1
1) The base material steel grade is Q690qENH, the yield strength ReL is more than or equal to 690MPa, the tensile strength Rm is more than or equal to 810MPa, the elongation A is more than or equal to 14 percent, and the impact energy KV at the temperature of minus 40℃ is2Not less than 120J; equal-thickness bridge steel with the plate thickness combination of 32mm +32 mm;
the test panel size is 800mm multiplied by 300mm multiplied by 32 mm;
2) the bevel adopts a single-side V-shaped bevel, the bevel angle is 40 degrees, the truncated edge is 2mm, and the gap is 6 mm;
matching welding materials: the gas shielded welding wire for bottoming adopts XY-ER80QNH welding wire, the diameter of the welding wire is phi 1.2mm, and the argon-rich gas is shielded, and the argon-rich gas comprises 80% of Ar and 20% of CO2The deposited metal has mechanical properties of Rel 746MPa, Rm 833MPa, A17.5%, and KV at-40 deg.C2The impact work is 79J;
the submerged arc automatic welding adopts XY-S80QNH welding wire, the diameter of the welding wire is phi 4.0mm, XY-AF85QNH welding flux combination is matched, the mechanical property of deposited metal is Rel 770MPa, Rm 904MPa, A18.0 percent, and KV2 impact energy at minus 40 ℃ is 138J.
The welding process comprises the following steps:
a) firstly, gas shielded welding is adopted to carry out multilayer multi-channel continuous welding on a joint, the welding current is 250A, the welding voltage is 28V, the welding speed is 30cm/min, the welding line energy is 14KJ/cm, and 20 percent of CO by volume is adopted2Argon-rich gas with 80% of Ar is used as protective gas, and welding is carried out under the condition that the flow rate is controlled at 20L/min;
b) and (4) performing submerged automatic arc welding to fill the cover surface, wherein the welding current is 650A, the welding voltage is 31V, the welding speed is 40cm/min, and the welding line energy is 30 KJ/cm. The interlayer temperature is controlled at 150 ℃, the tensile strength of deposited metal is 833MPa after the interlayer temperature is matched with a welding flux, and the diameter of a welding wire is phi 4.0 mm;
the welding process is adopted to weld the mechanical properties of the 810 MPa-grade high-performance weather-resistant bridge steel butt joint, wherein the tensile strength Rm of a welding seam is 927MPa, the central impact energy of the welding seam is-40 ℃ KV2 is 108J, and the heat affected zone is (1mm) -40 ℃ KV2 is 228J.
Example 2
1) The base material steel grade is Q690qENH, the yield strength ReL is more than or equal to 690MPa, the tensile strength Rm is more than or equal to 810MPa, the elongation A is more than or equal to 14 percent, and the impact energy KV at the temperature of minus 40℃ is2Not less than 120J; the plate thickness combination is 50mm +50mm of uniform thickness bridge steel;
the test plate size is 800mm multiplied by 300mm multiplied by 50 mm;
2) the bevel adopts a single-side V-shaped bevel, the bevel angle is 40 degrees, the truncated edge is 2mm, and the gap is 6 mm;
matching welding materials: the gas shielded welding wire for bottoming adopts XY-ER80QNH welding wire, the diameter of the welding wire is phi 1.2mm, and the argon-rich gas is shielded, and the argon-rich gas comprises 80% of Ar and 20% of CO2The deposited metal has mechanical properties of Rel 746MPa, Rm 833MPa, A17.5%, and KV at-40 deg.C2The impact work is 79J;
the submerged arc automatic welding adopts XY-S80QNH welding wire, the diameter of the welding wire is phi 4.0mm, XY-AF85QNH welding flux combination is matched, the mechanical property of deposited metal is Rel 770MPa, Rm 904MPa, A18.0 percent, and KV2 impact energy at minus 40 ℃ is 138J.
The welding process comprises the following steps:
a) firstly, gas shielded welding is adopted to carry out multilayer multi-channel continuous welding on a joint, the welding current is 250A, the welding voltage is 28V, the welding speed is 30cm/min, the welding line energy is 14KJ/cm, and 20 percent of CO by volume is adopted2Argon-rich gas with 80% of Ar is used as protective gas, and welding is carried out under the condition that the flow rate is controlled at 20L/min;
b) and (4) performing submerged automatic arc welding to fill the cover surface, wherein the welding current is 650A, the welding voltage is 31V, the welding speed is 40cm/min, and the welding line energy is 30 KJ/cm. The interlayer temperature is controlled at 150 ℃, the tensile strength of deposited metal is 833MPa after the interlayer temperature is matched with a welding flux, and the diameter of a welding wire is phi 4.0 mm;
the welding process is adopted to weld the mechanical properties of the 810 MPa-grade high-performance weather-resistant bridge steel butt joint, the tensile strength Rm of a welding seam is 927MPa, and the central impact energy of the welding seam is 40 ℃ below zero KV2154J, heat affected zone (1mm) -40 KV2＝230J。
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. A810 MPa-grade high-performance weather-resistant bridge steel composite weld joint liner single-side welding butt joint method comprises the following steps:
1) the bridge steel with the tensile strength of more than or equal to 810MPa is adopted, and the mechanical property characteristics are as follows: the yield strength ReL is more than or equal to 690MPa, the tensile strength Rm is more than or equal to 810MPa, the elongation A is more than or equal to 14 percent, and the impact energy KV at the temperature of minus 40 DEG C2≥120J；
2) The bevel adopts a single-side V-shaped bevel, the bevel angle is 40 degrees, and the gap is 6 mm;
3) assembling by using a code plate, and arranging a ceramic liner on the back of the gap;
4) the welding process comprises the following steps:
a) the joint adopts three layers of gas shielded welding for priming, the interlayer temperature is controlled to be 150-180 ℃, the welding current is 250A, the welding voltage is 28V, the welding speed is 30cm/min, the welding line energy is 14KJ/cm, and 20 percent of CO by volume is adopted2The argon-rich gas with 80% of Ar is used as protective gas, and welding is carried out under the condition that the flow rate is controlled to be 20-25L/min;
b) filling the cover surface by performing submerged arc automatic welding, controlling the interlayer temperature to be 150-180 ℃, matching with a preferred welding flux, and then ensuring that the tensile strength of deposited metal is more than 810MPa and the diameter phi of a welding wire is 4.0 mm;
wherein, the welding current of the submerged automatic arc welding is 650A, the welding voltage is 31V, the welding speed is 40cm/min, and the welding line energy is 30 KJ/cm.
2. The single-side welding butt joint method for the 810 MPa-grade high-performance weather-resistant bridge steel composite weld joint liner according to claim 1, characterized in that: the tensile strength of the gas shielded welding wire is more than 810MPa, and the diameter of the gas shielded welding wire is phi 1.2 mm.
3. The single-side welding butt joint method for the 810 MPa-grade high-performance weather-resistant bridge steel composite weld joint liner according to claim 1, characterized in that: the groove is provided with a 2mm blunt edge.
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| CN112238285A (en) * | 2020-10-25 | 2021-01-19 | 广州增立钢管结构股份有限公司 | Weathering steel welding method |
| CN112620888A (en) * | 2020-12-28 | 2021-04-09 | 中铁九桥工程有限公司 | Process method for single-side welding and double-side forming of Q500qENH weathering steel in alpine region |
| CN112658437A (en) * | 2020-12-17 | 2021-04-16 | 建湖县永维阀门钻件有限公司 | Welding process of marine drilling riser |
| CN112756746A (en) * | 2020-12-28 | 2021-05-07 | 中铁九桥工程有限公司 | Process method for Q500qENH weathering steel composite butt welding in alpine region |
| CN112935601A (en) * | 2021-01-27 | 2021-06-11 | 中建三局第一建设工程有限责任公司 | Multi-layer and multi-pass welding method for Q690D low-alloy high-strength steel thick plate |
| CN113182652A (en) * | 2021-05-12 | 2021-07-30 | 南京钢铁股份有限公司 | Submerged arc welding process for thick TMCP-state high-strength low-yield-ratio bridge steel |
| CN113305404A (en) * | 2021-05-31 | 2021-08-27 | 二十二冶集团装备制造有限公司 | Single-wire submerged-arc welding process for 30-50mm thick steel plate |
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| CN114799406A (en) * | 2022-05-07 | 2022-07-29 | 广船国际有限公司 | Welding method of plate for ship |
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| CN112238285A (en) * | 2020-10-25 | 2021-01-19 | 广州增立钢管结构股份有限公司 | Weathering steel welding method |
| CN112658437A (en) * | 2020-12-17 | 2021-04-16 | 建湖县永维阀门钻件有限公司 | Welding process of marine drilling riser |
| CN112620888A (en) * | 2020-12-28 | 2021-04-09 | 中铁九桥工程有限公司 | Process method for single-side welding and double-side forming of Q500qENH weathering steel in alpine region |
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| CN112620888B (en) * | 2020-12-28 | 2022-04-19 | 中铁九桥工程有限公司 | Process method for single-side welding and double-side forming of Q500qENH weathering steel in alpine region |
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| CN112935601A (en) * | 2021-01-27 | 2021-06-11 | 中建三局第一建设工程有限责任公司 | Multi-layer and multi-pass welding method for Q690D low-alloy high-strength steel thick plate |
| CN113369727A (en) * | 2021-05-10 | 2021-09-10 | 中交二航局结构工程有限公司 | Welding method for forming double surfaces of butt weld joint in control mode |
| CN113182652A (en) * | 2021-05-12 | 2021-07-30 | 南京钢铁股份有限公司 | Submerged arc welding process for thick TMCP-state high-strength low-yield-ratio bridge steel |
| CN113305404A (en) * | 2021-05-31 | 2021-08-27 | 二十二冶集团装备制造有限公司 | Single-wire submerged-arc welding process for 30-50mm thick steel plate |
| CN113305404B (en) * | 2021-05-31 | 2022-10-25 | 二十二冶集团装备制造有限公司 | Single-wire submerged arc welding process for 30-50mm thick steel plate |
| CN114799406A (en) * | 2022-05-07 | 2022-07-29 | 广船国际有限公司 | Welding method of plate for ship |
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