CN112756746A - Process method for Q500qENH weathering steel composite butt welding in alpine region - Google Patents
Process method for Q500qENH weathering steel composite butt welding in alpine region Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- 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
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Abstract
The invention discloses a Q500qENH weather-resistant steel composite butt welding process method in a high and cold area, which can overcome the adverse effect of the high and cold environment of the plateau on welding performance, improve the low-temperature toughness, the crack resistance and the weather resistance of a welding joint, thereby obtaining the welding joint with good mechanical properties and weather resistance, realizing the matched welding of large-span, heavy-load, high-strength, high-toughness and high-weather-resistant bridge steel in the high and cold area of the plateau, simultaneously avoiding the preheating before welding and the heat treatment after welding, improving the production efficiency, reducing the energy consumption, and being particularly suitable for the welding of steel for thick plate structures of high-strength bridge engineering.
Description
Technical Field
The invention relates to a process method for manufacturing and welding a heavy-duty bridge, in particular to a process method for composite butt welding of Q500qENH weathering steel in a severe cold area.
Background
According to research, weathering steel bridges are widely used in the United states and Japan, more than 23000 U.S. weathering steel bridges are accumulated in 1993, and coating-free weathering steel is adopted in 7% of U.S. weathering steel bridges and 45% of U.S. steel bridges in Japan and Japan in 2000. The development of the weather-resistant steel bridge in China is in the initial stage, the related technology generally refers to the American standard, and meanwhile, the control problems of the durability of the coating-free weather-resistant steel bridge and the like are solved.
The national key engineering Sichuan-Tibet railway is designed to be at the middle section (Yaan to Linzhi) of China, with the double line level 1, the motor train unit speed per hour of 120-200 km, the length of the front line of 1011 kilometers, and spanning river areas such as big river, Yazheng river, Jinsha river, billu river, Nuangjiang river and the like, and the control engineering comprises a plurality of super-large-span steel bridges. The engineering design and construction difficulty is extremely high under the severe geographical conditions of high plateau ultraviolet rays, high cold and oxygen deficiency, permafrost, collapse, dislocation, landslide, earthquake, geothermy, rockburst and the like, but the air quality is excellent, the humidity is overall moderate (local high humidity in the forest and glossy ganoderma region in summer), the method belongs to the typical rural atmospheric environment, and the method is suitable for constructing a coating-free weather-resistant steel bridge.
At present, Q500qENH weather-resistant bridge steel is a main steel material of a coating-free weather-resistant steel bridge, and a welding joint of the steel is required to have excellent low-temperature toughness, crack resistance and weather resistance in construction, and the method specifically comprises the following steps: the yield strength is more than or equal to 500 Mpa; the tensile strength is more than or equal to 630 Mpa; the elongation is more than or equal to 18 percent; the low-temperature impact energy of-40 ℃ KV2 is more than or equal to 54J.
However, the technical problems to be solved at present are that the Q500qENH weather-resistant bridge steel is increased along with the alloy content, the carbon equivalent is correspondingly improved, and the welding performance is poor; meanwhile, the requirements of the preheating process before welding and the heat treatment process after welding in the alpine environment of the plateau are more strict; the conventional welding process method and measures are difficult to meet the standards.
The invention discloses a Q500qENH weathering steel composite butt welding process method in alpine regions, which can overcome the adverse effect of alpine environments in plateau on welding performance, is particularly suitable for welding steel for a thick plate structure of high-strength bridge engineering, and can improve the low-temperature toughness, crack resistance and weather resistance of a welding joint, thereby obtaining the welding joint with good mechanical properties and weather resistance, realizing the matched welding of large-span, heavy-load, high-strength, high-toughness and high-weather resistance bridge steel in the alpine regions in plateau, and simultaneously avoiding the preheating before welding and the heat treatment after welding, improving the production efficiency and reducing the energy consumption.
Disclosure of Invention
The invention develops a process method for the Q500qENH weathering steel composite butt welding in the alpine region, the low-temperature toughness, the crack resistance and the weathering resistance of the welding joint obtained by the process method are extremely excellent, and the pre-welding preheating and the post-welding heat treatment are not needed, so that the production efficiency is improved, the energy consumption is reduced, and the process method is particularly suitable for the welding of the steel for the thick plate structure of the high-strength bridge engineering.
The invention discloses a process method for composite butt welding of Q500qENH weathering steel in alpine regions, which comprises the following steps:
(I) pretreatment of the weld face
(1) Polishing the welding surface and the adjacent area to remove impurities such as rust on the surface;
(II) cutting treatment of welding surface
(2) When the plate thickness is less than or equal to 20mm, the groove adopts a Y-shaped symmetrical groove, the angle of the groove is 50-60 degrees, and the height of the truncated edge is 2 mm;
(3) polishing again to remove metal scraps, and butting the truncated edges at the two sides together in a Y-shaped lower half sample;
(III) composite butt welding forming process
(4) And (3) welding and bottoming: the priming adopts a welding wire with the tensile strength of deposited metal being more than or equal to 650MPa, and gas shielded welding is adopted for priming;
(5) welding and filling: welding and filling the residual area, and filling by adopting a welding wire and a matched welding flux with the tensile strength of deposited metal being more than or equal to 650MPa by a submerged arc automatic welding method;
(6) and (3) controlling the inter-channel temperature of the priming layer in the step (4) and the welding filling layer in the step (5) to be 80-180 ℃.
Further, in the gas shielded welding used in the welding backing in the step (4), the welding wire is JQ.TH 650 EW-II or 202010907383.6 named as C02 gas shielded welding wire and wire rod with 650 MPa-level tensile strength for coating-free weather-resistant steel bridge, and the shielding gas is CO2(ii) a The technological parameters of the gas shielded welding are that the holding current is 180A-280A, the voltage is 25V-30V, and the welding is carried outThe speed is 30cm/min to 35cm/min, the flow of protective gas is 15L/min to 25L/min, and the linear energy is 14KJ/cm to 16 KJ/cm.
Furthermore, the welding wire used in the welding and filling in the step (5) is SD-H08Mn2E or the welding wire with the patent number of 202010907395.9 and the invention name of 'coating-free weather-resistant steel bridge used submerged arc automatic welding wire and wire rod with the tensile strength of 650MPa grade', and the matched welding flux is SJ105 Nq; the technological parameters of the automatic submerged arc welding are that the current is kept between 650A and 700A, the voltage is kept between 30V and 35V, the welding speed is kept between 35cm/min and 40cm/min, and the linear energy is kept between 30KJ/cm and 32 KJ/cm.
The invention relates to a second technical method for composite butt welding of Q500qENH weathering steel in alpine regions, which comprises the following steps:
(I) pretreatment of the weld face
(1) Polishing the welding surface and the adjacent area to remove impurities such as rust on the surface;
(II) cutting treatment of welding surface
(2) When the plate thickness is more than or equal to 20mm, the groove adopts an X-shaped asymmetric groove, the height of the truncated edge is 2mm, and the upper edge of the truncated edge is positioned on the central line of the steel plate, so that the X-shaped asymmetric groove is in a shape with a large upper end and a small lower end; the bevel angle at two sides is 50-60 degrees;
(3) polishing again to remove metal scraps, and butting X-shaped truncated edges at two sides together;
(III) composite butt welding forming process
(4) And (3) welding and bottoming: the priming adopts a welding wire with the tensile strength of deposited metal being more than or equal to 650MPa, and gas shielded welding is adopted for priming;
(5) welding and filling: welding and filling the residual area, and filling by adopting a welding wire and a matched welding flux with the tensile strength of deposited metal being more than or equal to 650MPa by a submerged arc automatic welding method;
(6) controlling the inter-channel temperature of the priming layer in the step (4) and the welding filling layer in the step (5) to be 80-180 ℃;
(7) after the upper end groove of the X-shaped asymmetric groove is welded by the process, the steel plate is turned over, and then the lower end groove of the X-shaped asymmetric groove is continuously welded.
Further, in the gas shielded welding used in the welding backing in the step (4), the welding wire is JQ.TH 650 EW-II or 202010907383.6 named as C02 gas shielded welding wire and wire rod with 650 MPa-level tensile strength for coating-free weather-resistant steel bridge, and the shielding gas is CO2(ii) a The technological parameters of the gas shielded welding are that the current is kept between 180A and 280A, the voltage is kept between 25V and 30V, the welding speed is kept between 30cm/min and 35cm/min, the flow of the shielding gas is kept between 15L/min and 25L/min, and the linear energy is kept between 14KJ/cm and 16 KJ/cm.
Furthermore, the welding wire used in the welding and filling in the step (5) is SD-H08Mn2E or the welding wire with the patent number of 202010907395.9 and the invention name of 'coating-free weather-resistant steel bridge used submerged arc automatic welding wire and wire rod with the tensile strength of 650MPa grade', and the matched welding flux is SJ105 Nq; the technological parameters of the automatic submerged arc welding are that the current is kept between 650A and 700A, the voltage is kept between 30V and 35V, the welding speed is kept between 35cm/min and 40cm/min, and the linear energy is kept between 30KJ/cm and 32 KJ/cm.
Further, in the 2 processes, before the welding is performed in the third composite butt welding forming process, a liner is added to the bottom of the groove, and the liner can adapt to the shape of the groove.
Further, the pad comprises a first load bearing area 1, a second load bearing area 2 and a heat dissipation area 3, wherein the heat dissipation area 3 is composed of 3 layers: the uppermost layer is a microporous breathable layer 31, the middle layer is a bearing sealing layer 32, and the lowermost layer is a bottom sealing layer 33; the microporous gas-permeable layer 31 and the load-bearing sealing layer 32 form CO2A generation chamber 4 for the CO2The generation chamber 4 is filled with CO which can be decomposed by heat and released2Of the substance of (1), said CO2 A sealing plate 41 which can be opened and closed and sealed is arranged on the side of the generating cavity 4; the bearing sealing layer 32 and the bottom sealing layer 33 form a bottom heat absorption cavity 5, and the bottom heat absorption cavity 5 is filled with reversible heat absorption substances.
Further, the thermal decomposable release CO2The substance of (a) is sodium bicarbonate.
Further, the reversible heat-absorbing substance is sodium sulfate decahydrate.
Further, the material of the liner is ceramic or steel.
The invention has the advantages that:
1. the Q500qENH high-performance weather-resistant bridge steel is not preheated before welding and does not undergo a heat treatment process after welding, and a welding joint of the high-performance weather-resistant bridge steel has excellent low-temperature toughness, crack resistance and weather resistance, and specifically comprises the following steps: the yield strength is more than or equal to 550Mpa, the tensile strength is more than or equal to 650Mpa, the elongation is more than or equal to 20 percent, the low-temperature impact energy of 40 ℃ KV2 is more than or equal to 80J, the yield strength is more than or equal to 500Mpa, the tensile strength is more than or equal to 630Mpa, the elongation is more than or equal to 18 percent, and the low-temperature impact energy of 40 ℃ KV2 is more than or equal to 54J. The invention has the advantages that a large number of tests are carried out, flaw detection is carried out, the phenomenon of crack generation is not found, the joint has higher impact toughness storage and safety margin, and the key technical requirements of manufacturing a large-span bridge steel structure in a severe cold area can be completely met.
2. The invention discloses a process method for Q500qENH weathering steel composite butt welding forming in a high and cold area, which is extremely suitable for welding thick plates of Q500qENH weathering steel and fills up the blank of the welding process manufacturing technology in the high and cold area proposed in China.
3. The welding process disclosed by the invention has excellent welding process performance, is simple and convenient to operate, is suitable for being used conveniently, is efficient and energy-saving, can adapt to the climatic characteristics of Sichuan-Tibet areas, and particularly has obvious effects of improving the low-temperature toughness, the crack resistance and the weather resistance of a welding joint when the ambient temperature is 0-5 ℃ and the relative humidity is less than 80%. The welding method is suitable for manufacturing, popularizing and applying the high-performance weather-resistant bridge steel of the large-span bridge in the alpine region, is particularly suitable for welding the steel for the thick plate structure of the high-strength bridge engineering, and meets the technical requirements of the matching welding of the new-generation high-strength, high-toughness and high-weather-resistant bridge steel in China.
4. Compared with the common welding process of pre-heating before welding and heat treatment after welding, the welding process is suitable for welding the Q500qENH weather-resistant bridge steel in the plateau high-cold environment, overcomes the adverse effect of the plateau high-cold environment on the welding performance, improves the low-temperature toughness, the crack resistance and the weather resistance of a welding joint, improves the production efficiency and reduces the energy consumption.
5. The key control point of the invention is that the temperature between the roads is controlled to be 80-180 ℃, wherein the gasket has the functions of bearing and heat conduction, and the CO arranged on the gasket2The generation chamber can release CO from the bottom layer of the welded joint2The protective gas improves the welding quality of gas shielded welding; the bottom heat absorption cavity arranged on the liner can further absorb welding heat, reduce the inter-channel temperature, simultaneously has the function of relieving the too fast temperature reduction speed of a welding joint, is beneficial to the generation of a bainite structure and an acicular ferrite structure, improves the control of the inter-channel temperature by the process disclosed by the invention, and greatly improves the quality of the whole welding process.
6. The invention utilizes the liner to fix the groove and relieve the welding stress, and simultaneously utilizes the liner which can be decomposed by heat to release CO2The substances absorb the strong heat of welding and decompose CO2So as to realize the omnibearing protection of welding and realize the function of rapid temperature reduction between the tracks; meanwhile, welding waste heat is absorbed by a reversible heat absorbing substance, so that the temperature between the channels does not continuously and rapidly decrease when reaching 80-180 ℃, the control of the temperature between the channels is more stable, and the working time window is effectively increased; the invention can prevent the welding line from overheating and blackening, is beneficial to the generation of acicular ferrite tissues of the welding line, enhances various performances of a welding joint, and is particularly suitable for welding weather-resistant bridge steel in alpine regions.
7. The X-shaped groove is designed in an asymmetric mode, so that the stress generated on two sides of the steel plate can be relieved during turn-over welding, and the low-temperature toughness, the crack resistance and the weather resistance of a welding joint are improved.
Drawings
FIG. 1 is a diagram showing the welding effect of example 6 of the present invention at 0 ℃;
FIG. 2 is a schematic groove of example 2 of the present invention;
FIG. 3 is a schematic groove of example 6 of the present invention;
FIG. 4 is a cross-sectional view of a gasket according to example 2 of the present invention (the gasket is placed under a symmetrical groove of "Y";
FIG. 5 is a front view of a sealing plate according to embodiment 2 of the present invention;
FIG. 6 is a cross-sectional view of the gasket of example 6 of the present invention (the gasket is wedged into the lower end groove of the "X" type asymmetric groove);
FIG. 7 is a front view of a sealing plate according to embodiment 6 of the present invention;
in the figure, the truncated edge is the vertical part of the bottom of the "Y" shape in the bevel diagram of FIG. 2 and the vertical part of the middle of the "X" shape in the bevel diagram of FIG. 3; the height of the truncated edge is marked as "H"; the bevel angle is marked as "α";
in the figure, 1-the first load-bearing zone, 2-the second load-bearing zone, 3-the heat-dissipating zone, 31-the microporous breathable layer, 32-the load-bearing sealing layer, 33-the bottom sealing layer, 4-CO2Generation chamber, 41-sealing plate, 5-bottom heat absorption chamber
Detailed Description
Example 1
A process method for Q500qENH weathering steel composite butt welding in alpine regions comprises the following steps:
(I) pretreatment of the weld face
(1) Polishing the welding surface and the adjacent area to remove impurities such as rust on the surface;
(II) cutting treatment of welding surface
(2) When the plate thickness is less than or equal to 20mm, the groove adopts a Y-shaped symmetrical groove, the angle of the groove is 50 degrees, and the height of the truncated edge is 2 mm;
(3) polishing again to remove metal scraps, and butting the truncated edges at the two sides together in a Y-shaped lower half sample;
(III) composite butt welding forming process
(4) And (3) welding and bottoming: the priming adopts a welding wire with the tensile strength of deposited metal being more than or equal to 650MPa, and gas shielded welding is adopted for priming;
(5) welding and filling: welding and filling the residual area, and filling by adopting a welding wire and a matched welding flux with the tensile strength of deposited metal being more than or equal to 650MPa by a submerged arc automatic welding method;
(6) and (3) controlling the inter-channel temperature of the priming layer in the step (4) and the welding filling layer in the step (5) to be 180 ℃.
The gas shielded welding used for the welding backing in the step (4) is JQ.TH 650 EW-II, and the shielding gas is CO2. The technological parameters of the gas shielded welding are that the current is kept at 180A, the voltage is 25V, the welding speed is 30cm/min, the flow of the shielding gas is 15L/min, and the linear energy is 14 KJ/cm.
And (3) welding wires used in the welding and filling in the step (5) are SD-H08Mn2E, and the matched flux is SJ105 Nq. The technological parameters of the automatic submerged arc welding are that the current is kept at 650A, the voltage is 30V, the welding speed is 35cm/min, and the linear energy is 30 KJ/cm.
In the process, before the third step of composite butt welding forming process is used for welding, the gasket is added at the bottom of the groove, and the gasket can adapt to the shape of the groove.
The pad comprises a first load bearing area 1, a second load bearing area 2 and a heat dissipation area 3, wherein the heat dissipation area 3 consists of 3 layers: the uppermost layer is a microporous breathable layer 31, the middle layer is a bearing sealing layer 32, and the lowermost layer is a bottom sealing layer 33; the microporous gas-permeable layer 31 and the load-bearing sealing layer 32 form CO2A generation chamber 4 for the CO2The generation chamber 4 is filled with CO which can be decomposed by heat and released2Of the substance of (1), said CO2 A sealing plate 41 which can be opened and closed and sealed is arranged on the side of the generating cavity 4; the bearing sealing layer 32 and the bottom sealing layer 33 form a bottom heat absorption cavity 5, and the bottom heat absorption cavity 5 is filled with reversible heat absorption substances.
The thermally decomposable release of CO2The substance of (a) is sodium bicarbonate.
The reversible heat-absorbing substance is sodium sulfate decahydrate.
The material of the liner is ceramic.
Example 2
A process method for Q500qENH weathering steel composite butt welding in alpine regions comprises the following steps:
(I) pretreatment of the weld face
(1) Polishing the welding surface and the adjacent area to remove impurities such as rust on the surface;
(II) cutting treatment of welding surface
(2) When the plate thickness is less than or equal to 20mm, the groove adopts a Y-shaped symmetrical groove, the angle of the groove is 60 degrees, and the height of the truncated edge is 2 mm;
(3) polishing again to remove metal scraps, and butting the truncated edges at the two sides together in a Y-shaped lower half sample;
(III) composite butt welding forming process
(4) And (3) welding and bottoming: the priming adopts a welding wire with the tensile strength of deposited metal being more than or equal to 650MPa, and gas shielded welding is adopted for priming;
(5) welding and filling: welding and filling the residual area, and filling by adopting a welding wire and a matched welding flux with the tensile strength of deposited metal being more than or equal to 650MPa by a submerged arc automatic welding method;
(6) and (3) controlling the inter-channel temperature of the priming layer in the step (4) and the welding filling layer in the step (5) to be 130 ℃.
The welding wire used for the backing welding in the step (4) is the welding wire with the patent number of 202010907383.6 and the invention name of C02 gas shielded welding wire and wire rod with the tensile strength of 650MPa for the coating-free weather-resistant steel bridge, and the shielding gas is CO2. The technological parameters of the gas shielded welding are that the current is kept to be 250A, the voltage is 28V, the welding speed is 30cm/min, the flow of the shielding gas is 20L/min, and the linear energy is 14 KJ/cm.
The welding wire used in the step (5) for filling welding is the welding wire with the patent number of 202010907395.9 and the invention name of 'coating-free weather-resistant steel bridge submerged arc automatic welding wire and wire rod with the tensile strength of 650MPa grade', and the matched welding flux is SJ105 Nq. The technological parameters of the automatic submerged arc welding are that the current is kept at 650A, the voltage is 31V, the welding speed is 40cm/min, and the linear energy is 30 KJ/cm.
In the process, before the third step of composite butt welding forming process is used for welding, the gasket is added at the bottom of the groove, and the gasket can adapt to the shape of the groove.
The pad comprises a first load bearing area 1, a second load bearing area 2 and a heat dissipation area 3, wherein the heat dissipation area 3 consists of 3 layers: the uppermost layer is a microporous breathable layer 31, the middle layer is a bearing sealing layer 32, and the lowermost layer is a bottom sealing layer 33; the microporous gas-permeable layer 31 and the load-bearing sealing layer 32 form CO2A generation chamber 4 for the CO2The generating chamber 4 is provided with a heat decomposable releaseCO discharge2Of the substance of (1), said CO2 A sealing plate 41 which can be opened and closed and sealed is arranged on the side of the generating cavity 4; the bearing sealing layer 32 and the bottom sealing layer 33 form a bottom heat absorption cavity 5, and the bottom heat absorption cavity 5 is filled with reversible heat absorption substances.
The thermally decomposable release of CO2The substance of (a) is sodium bicarbonate.
The reversible heat-absorbing substance is sodium sulfate decahydrate.
The material of the liner is ceramic.
Example 3
A process method for Q500qENH weathering steel composite butt welding in alpine regions comprises the following steps:
(I) pretreatment of the weld face
(1) Polishing the welding surface and the adjacent area to remove impurities such as rust on the surface;
(II) cutting treatment of welding surface
(2) When the plate thickness is less than or equal to 20mm, the groove adopts a Y-shaped symmetrical groove, the angle of the groove is 60 degrees, and the height of the truncated edge is 2 mm;
(3) polishing again to remove metal scraps, and butting the truncated edges at the two sides together in a Y-shaped lower half sample;
(III) composite butt welding forming process
(4) And (3) welding and bottoming: the priming adopts a welding wire with the tensile strength of deposited metal being more than or equal to 650MPa, and gas shielded welding is adopted for priming;
(5) welding and filling: welding and filling the residual area, and filling by adopting a welding wire and a matched welding flux with the tensile strength of deposited metal being more than or equal to 650MPa by a submerged arc automatic welding method;
(6) and (3) controlling the inter-channel temperature of the priming layer in the step (4) and the welding filling layer in the step (5) to be 80 ℃.
The welding wire used for the backing welding in the step (4) is the welding wire with the patent number of 202010907383.6 and the invention name of C02 gas shielded welding wire and wire rod with the tensile strength of 650MPa for the coating-free weather-resistant steel bridge, and the shielding gas is CO2. The technological parameter of the gas shielded welding keeps the current to be 280A, 30V of voltage, 35cm/min of welding speed, 25L/min of protective gas flow and 16KJ/cm of linear energy.
The welding wire used in the step (5) for filling welding is the welding wire with the patent number of 202010907395.9 and the invention name of 'coating-free weather-resistant steel bridge submerged arc automatic welding wire and wire rod with the tensile strength of 650MPa grade', and the matched welding flux is SJ105 Nq. The technological parameters of the automatic submerged arc welding are that the current is kept at 700A, the voltage is 35V, the welding speed is 40cm/min, and the linear energy is 32 KJ/cm.
In the process, before the third step of composite butt welding forming process is used for welding, the gasket is added at the bottom of the groove, and the gasket can adapt to the shape of the groove.
The pad comprises a first load bearing area 1, a second load bearing area 2 and a heat dissipation area 3, wherein the heat dissipation area 3 consists of 3 layers: the uppermost layer is a microporous breathable layer 31, the middle layer is a bearing sealing layer 32, and the lowermost layer is a bottom sealing layer 33; the microporous gas-permeable layer 31 and the load-bearing sealing layer 32 form CO2A generation chamber 4 for the CO2The generation chamber 4 is filled with CO which can be decomposed by heat and released2Of the substance of (1), said CO2 A sealing plate 41 which can be opened and closed and sealed is arranged on the side of the generating cavity 4; the bearing sealing layer 32 and the bottom sealing layer 33 form a bottom heat absorption cavity 5, and the bottom heat absorption cavity 5 is filled with reversible heat absorption substances.
The thermally decomposable release of CO2The substance of (a) is sodium bicarbonate.
The reversible heat-absorbing substance is sodium sulfate decahydrate.
The gasket is made of steel.
Example 4
A process method for Q500qENH weathering steel composite butt welding in alpine regions comprises the following steps:
(I) pretreatment of the weld face
(1) Polishing the welding surface and the adjacent area to remove impurities such as rust on the surface;
(II) cutting treatment of welding surface
(2) When the plate thickness is less than or equal to 20mm, the groove adopts a Y-shaped symmetrical groove, the angle of the groove is 45 degrees, and the height of the truncated edge is 1 mm;
(3) polishing again to remove metal scraps, and butting the truncated edges at the two sides together in a Y-shaped lower half sample;
(III) composite butt welding forming process
(4) And (3) welding and bottoming: the priming adopts a welding wire with the tensile strength of deposited metal being more than or equal to 650MPa, and gas shielded welding is adopted for priming;
(5) welding and filling: welding and filling the residual area, and filling by adopting a welding wire and a matched welding flux with the tensile strength of deposited metal being more than or equal to 650MPa by a submerged arc automatic welding method;
(6) and (3) controlling the inter-channel temperature of the priming layer in the step (4) and the welding filling layer in the step (5) to be 70 ℃.
The welding wire used for the backing welding in the step (4) is the welding wire with the patent number of 202010907383.6 and the invention name of C02 gas shielded welding wire and wire rod with the tensile strength of 650MPa for the coating-free weather-resistant steel bridge, and the shielding gas is CO2. The technological parameters of the gas shielded welding are that the current is kept at 170A, the voltage is 24V, the welding speed is 40cm/min, the flow of the shielding gas is 14L/min, and the linear energy is 12 KJ/cm.
The welding wire used in the step (5) for filling welding is the welding wire with the patent number of 202010907395.9 and the invention name of 'coating-free weather-resistant steel bridge submerged arc automatic welding wire and wire rod with the tensile strength of 650MPa grade', and the matched welding flux is SJ105 Nq. The technological parameters of the automatic submerged arc welding are that the current is kept at 620A, the voltage is 28V, the welding speed is 45cm/min, and the linear energy is 28 KJ/cm.
In the process, before the third step of composite butt welding forming process is used for welding, the gasket is added at the bottom of the groove, and the gasket can adapt to the shape of the groove.
The pad comprises a first load bearing area 1, a second load bearing area 2 and a heat dissipation area 3, wherein the heat dissipation area 3 consists of 3 layers: the uppermost layer is a microporous breathable layer 31, the middle layer is a bearing sealing layer 32, and the lowermost layer is a bottom sealing layer 33; the microporous gas-permeable layer 31 and the load-bearing sealing layer 32 form CO2A generation chamber 4 for the CO2The generation chamber 4 is filled with CO which can be decomposed by heat and released2Of the substance of (1), said CO2 A sealing plate 41 which can be opened and closed and sealed is arranged on the side of the generating cavity 4; the bearing sealing layer 32 and the bottom sealing layer 33 form a bottom heat absorption cavity 5, and the bottom heat absorption cavity 5 is filled with reversible heat absorption substances.
The thermally decomposable release of CO2The substance of (a) is sodium bicarbonate.
The reversible heat-absorbing substance is sodium sulfate decahydrate.
The gasket is made of steel.
Example 5
A process method for Q500qENH weathering steel composite butt welding in alpine regions comprises the following steps:
(I) pretreatment of the weld face
(1) Polishing the welding surface and the adjacent area to remove impurities such as rust on the surface;
(II) cutting treatment of welding surface
(2) When the plate thickness is more than or equal to 20mm, the groove adopts an X-shaped asymmetric groove, the height of the truncated edge is 2mm, and the upper edge of the truncated edge is positioned on the central line of the steel plate, so that the X-shaped asymmetric groove is in a shape with a large upper end and a small lower end; the bevel angle on the two sides is 50 degrees;
(3) polishing again to remove metal scraps, and butting X-shaped truncated edges at two sides together;
(III) composite butt welding forming process
(4) And (3) welding and bottoming: the priming adopts a welding wire with the tensile strength of deposited metal being more than or equal to 650MPa, and gas shielded welding is adopted for priming;
(5) welding and filling: welding and filling the residual area, and filling by adopting a welding wire and a matched welding flux with the tensile strength of deposited metal being more than or equal to 650MPa by a submerged arc automatic welding method;
(6) controlling the inter-channel temperature of the priming layer in the step (4) and the welding filling layer in the step (5) to be 180 ℃;
(7) after the upper end groove of the X-shaped asymmetric groove is welded by the process, the steel plate is turned over, and then the lower end groove of the X-shaped asymmetric groove is continuously welded.
The gas protector used for the step (4) of welding and primingWelding with JQ & TH650 EW-II welding wire and CO as protective gas2. The technological parameters of the gas shielded welding are that the current is kept at 180A, the voltage is 25V, the welding speed is 30cm/min, the flow of the shielding gas is 15L/min, and the linear energy is 14 KJ/cm.
And (3) welding wires used in the welding and filling in the step (5) are SD-H08Mn2E, and the matched flux is SJ105 Nq. The technological parameters of the automatic submerged arc welding are that the current is kept at 650A, the voltage is 30V, the welding speed is 35cm/min, and the linear energy is 30 KJ/cm.
In the process, before the third step of composite butt welding forming process is used for welding, the gasket is added at the bottom of the groove, and the gasket can adapt to the shape of the groove.
The pad comprises a first load bearing area 1, a second load bearing area 2 and a heat dissipation area 3, wherein the heat dissipation area 3 consists of 3 layers: the uppermost layer is a microporous breathable layer 31, the middle layer is a bearing sealing layer 32, and the lowermost layer is a bottom sealing layer 33; the microporous gas-permeable layer 31 and the load-bearing sealing layer 32 form CO2A generation chamber 4 for the CO2The generation chamber 4 is filled with CO which can be decomposed by heat and released2Of the substance of (1), said CO2 A sealing plate 41 which can be opened and closed and sealed is arranged on the side of the generating cavity 4; the bearing sealing layer 32 and the bottom sealing layer 33 form a bottom heat absorption cavity 5, and the bottom heat absorption cavity 5 is filled with reversible heat absorption substances.
The thermally decomposable release of CO2The substance of (a) is sodium bicarbonate.
The reversible heat-absorbing substance is sodium sulfate decahydrate.
The material of the liner is ceramic.
Example 6
A process method for Q500qENH weathering steel composite butt welding in alpine regions comprises the following steps:
(I) pretreatment of the weld face
(1) Polishing the welding surface and the adjacent area to remove impurities such as rust on the surface;
(II) cutting treatment of welding surface
(2) When the plate thickness is more than or equal to 20mm, the groove adopts an X-shaped asymmetric groove, the height of the truncated edge is 2mm, and the upper edge of the truncated edge is positioned on the central line of the steel plate, so that the X-shaped asymmetric groove is in a shape with a large upper end and a small lower end; the bevel angle on the two sides is 60 degrees;
(3) polishing again to remove metal scraps, and butting X-shaped truncated edges at two sides together;
(III) composite butt welding forming process
(4) And (3) welding and bottoming: the priming adopts a welding wire with the tensile strength of deposited metal being more than or equal to 650MPa, and gas shielded welding is adopted for priming;
(5) welding and filling: welding and filling the residual area, and filling by adopting a welding wire and a matched welding flux with the tensile strength of deposited metal being more than or equal to 650MPa by a submerged arc automatic welding method;
(6) controlling the inter-channel temperature of the priming layer in the step (4) and the welding filling layer in the step (5) to be 130 ℃;
(7) after the upper end groove of the X-shaped asymmetric groove is welded by the process, the steel plate is turned over, and then the lower end groove of the X-shaped asymmetric groove is continuously welded.
The welding wire used for the backing welding in the step (4) is the welding wire with the patent number of 202010907383.6 and the invention name of C02 gas shielded welding wire and wire rod with the tensile strength of 650MPa for the coating-free weather-resistant steel bridge, and the shielding gas is CO2. The technological parameters of the gas shielded welding are that the current is kept to be 250A, the voltage is 28V, the welding speed is 30cm/min, the flow of the shielding gas is 20L/min, and the linear energy is 14 KJ/cm.
The welding wire used in the step (5) for filling welding is the welding wire with the patent number of 202010907395.9 and the invention name of 'coating-free weather-resistant steel bridge submerged arc automatic welding wire and wire rod with the tensile strength of 650MPa grade', and the matched welding flux is SJ105 Nq. The technological parameters of the automatic submerged arc welding are that the current is kept at 650A, the voltage is 31V, the welding speed is 40cm/min, and the linear energy is 30 KJ/cm.
In the process, before the third step of composite butt welding forming process is used for welding, the gasket is added at the bottom of the groove, and the gasket can adapt to the shape of the groove.
The pad comprises a first bearing area 1, a second bearing area 2 and a heat dissipation area 3, wherein the heat dissipation area 3 consists of 3 layersConsists of the following components: the uppermost layer is a microporous breathable layer 31, the middle layer is a bearing sealing layer 32, and the lowermost layer is a bottom sealing layer 33; the microporous gas-permeable layer 31 and the load-bearing sealing layer 32 form CO2A generation chamber 4 for the CO2The generation chamber 4 is filled with CO which can be decomposed by heat and released2Of the substance of (1), said CO2 A sealing plate 41 which can be opened and closed and sealed is arranged on the side of the generating cavity 4; the bearing sealing layer 32 and the bottom sealing layer 33 form a bottom heat absorption cavity 5, and the bottom heat absorption cavity 5 is filled with reversible heat absorption substances.
The thermally decomposable release of CO2The substance of (a) is sodium bicarbonate.
The reversible heat-absorbing substance is sodium sulfate decahydrate.
The material of the liner is ceramic.
Example 7
A process method for Q500qENH weathering steel composite butt welding in alpine regions comprises the following steps:
(I) pretreatment of the weld face
(1) Polishing the welding surface and the adjacent area to remove impurities such as rust on the surface;
(II) cutting treatment of welding surface
(2) When the plate thickness is more than or equal to 20mm, the groove adopts an X-shaped asymmetric groove, the height of the truncated edge is 2mm, and the upper edge of the truncated edge is positioned on the central line of the steel plate, so that the X-shaped asymmetric groove is in a shape with a large upper end and a small lower end; the bevel angle on the two sides is 60 degrees;
(3) polishing again to remove metal scraps, and butting X-shaped truncated edges at two sides together;
(III) composite butt welding forming process
(4) And (3) welding and bottoming: the priming adopts a welding wire with the tensile strength of deposited metal being more than or equal to 650MPa, and gas shielded welding is adopted for priming;
(5) welding and filling: welding and filling the residual area, and filling by adopting a welding wire and a matched welding flux with the tensile strength of deposited metal being more than or equal to 650MPa by a submerged arc automatic welding method;
(6) controlling the inter-channel temperature of the priming layer in the step (4) and the welding filling layer in the step (5) to be 80 ℃;
(7) after the upper end groove of the X-shaped asymmetric groove is welded by the process, the steel plate is turned over, and then the lower end groove of the X-shaped asymmetric groove is continuously welded.
The welding wire used for the backing welding in the step (4) is the welding wire with the patent number of 202010907383.6 and the invention name of C02 gas shielded welding wire and wire rod with the tensile strength of 650MPa for the coating-free weather-resistant steel bridge, and the shielding gas is CO2. The technological parameters of the gas shielded welding are that the current is kept at 280A, the voltage is 30V, the welding speed is 35cm/min, the flow of the shielding gas is 25L/min, and the linear energy is 16 KJ/cm.
The welding wire used in the step (5) for filling welding is the welding wire with the patent number of 202010907395.9 and the invention name of 'coating-free weather-resistant steel bridge submerged arc automatic welding wire and wire rod with the tensile strength of 650MPa grade', and the matched welding flux is SJ105 Nq. The technological parameters of the automatic submerged arc welding are that the current is kept at 700A, the voltage is 35V, the welding speed is 40cm/min, and the linear energy is 32 KJ/cm.
In the process, before the third step of composite butt welding forming process is used for welding, the gasket is added at the bottom of the groove, and the gasket can adapt to the shape of the groove.
The pad comprises a first load bearing area 1, a second load bearing area 2 and a heat dissipation area 3, wherein the heat dissipation area 3 consists of 3 layers: the uppermost layer is a microporous breathable layer 31, the middle layer is a bearing sealing layer 32, and the lowermost layer is a bottom sealing layer 33; the microporous gas-permeable layer 31 and the load-bearing sealing layer 32 form CO2A generation chamber 4 for the CO2The generation chamber 4 is filled with CO which can be decomposed by heat and released2Of the substance of (1), said CO2 A sealing plate 41 which can be opened and closed and sealed is arranged on the side of the generating cavity 4; the bearing sealing layer 32 and the bottom sealing layer 33 form a bottom heat absorption cavity 5, and the bottom heat absorption cavity 5 is filled with reversible heat absorption substances.
The thermally decomposable release of CO2The substance of (a) is sodium bicarbonate.
The reversible heat-absorbing substance is sodium sulfate decahydrate.
The gasket is made of steel.
Example 8
A process method for Q500qENH weathering steel composite butt welding in alpine regions comprises the following steps:
(I) pretreatment of the weld face
(1) Polishing the welding surface and the adjacent area to remove impurities such as rust on the surface;
(II) cutting treatment of welding surface
(2) When the plate thickness is more than or equal to 20mm, the groove adopts an X-shaped asymmetric groove, the height of the truncated edge is 1mm, and the upper edge of the truncated edge is positioned on the central line of the steel plate, so that the X-shaped asymmetric groove is in a shape with a large upper end and a small lower end; the bevel angle on the two sides is 45 degrees;
(3) polishing again to remove metal scraps, and butting X-shaped truncated edges at two sides together;
(III) composite butt welding forming process
(4) And (3) welding and bottoming: the priming adopts a welding wire with the tensile strength of deposited metal being more than or equal to 650MPa, and gas shielded welding is adopted for priming;
(5) welding and filling: welding and filling the residual area, and filling by adopting a welding wire and a matched welding flux with the tensile strength of deposited metal being more than or equal to 650MPa by a submerged arc automatic welding method;
(6) controlling the inter-channel temperature of the priming layer in the step (4) and the welding filling layer in the step (5) to be 190 ℃;
(7) after the upper end groove of the X-shaped asymmetric groove is welded by the process, the steel plate is turned over, and then the lower end groove of the X-shaped asymmetric groove is continuously welded.
The welding wire used for the backing welding in the step (4) is the welding wire with the patent number of 202010907383.6 and the invention name of C02 gas shielded welding wire and wire rod with the tensile strength of 650MPa for the coating-free weather-resistant steel bridge, and the shielding gas is CO2. The technological parameters of the gas shielded welding are that the current is kept at 170A, the voltage is 24V, the welding speed is 40cm/min, the flow of the shielding gas is 14L/min, and the linear energy is 12 KJ/cm.
The welding wire used in the step (5) for filling welding is the welding wire with the patent number of 202010907395.9 and the invention name of 'coating-free weather-resistant steel bridge submerged arc automatic welding wire and wire rod with the tensile strength of 650MPa grade', and the matched welding flux is SJ105 Nq. The technological parameters of the automatic submerged arc welding are that the current is kept at 620A, the voltage is 28V, the welding speed is 45cm/min, and the linear energy is 28 KJ/cm.
In the process, before the third step of composite butt welding forming process is used for welding, the gasket is added at the bottom of the groove, and the gasket can adapt to the shape of the groove.
The pad comprises a first load bearing area 1, a second load bearing area 2 and a heat dissipation area 3, wherein the heat dissipation area 3 consists of 3 layers: the uppermost layer is a microporous breathable layer 31, the middle layer is a bearing sealing layer 32, and the lowermost layer is a bottom sealing layer 33; the microporous gas-permeable layer 31 and the load-bearing sealing layer 32 form CO2A generation chamber 4 for the CO2The generation chamber 4 is filled with CO which can be decomposed by heat and released2Of the substance of (1), said CO2 A sealing plate 41 which can be opened and closed and sealed is arranged on the side of the generating cavity 4; the bearing sealing layer 32 and the bottom sealing layer 33 form a bottom heat absorption cavity 5, and the bottom heat absorption cavity 5 is filled with reversible heat absorption substances.
The thermally decomposable release of CO2The substance of (a) is sodium bicarbonate.
The reversible heat-absorbing substance is sodium sulfate decahydrate.
The gasket is made of steel.
Comparative example 1
A process method for Q500qENH weathering steel composite butt welding in alpine regions is characterized in that a groove angle alpha is 45 degrees, and the height of a truncated edge is 1 mm; the rest is the same as example 2.
Comparative example 2
A technological method for Q500qENH weathering steel composite butt welding in alpine regions is characterized in that a groove angle alpha is 65 degrees, and a truncated edge height H is 3 mm; the rest is the same as example 2.
Comparative example 3
A process method for Q500qENH weathering steel composite butt welding in alpine regions is characterized in that the temperature between the base layer in the step (4) and the welding filling layer in the step (5) in the step (6) is controlled at 70 ℃, and the rest is the same as that in the embodiment 2.
Comparative example 4
A process method for Q500qENH weathering steel composite butt welding in alpine regions is characterized in that the temperature between the base layer in the step (4) and the welding filling layer in the step (5) in the step (6) is controlled at 190 ℃, and the rest is the same as that in the embodiment 2.
Comparative example 5
A process method for Q500qENH weathering steel composite butt welding in alpine regions is characterized in that gas shielded welding is used for backing in the step (4), welding wires are the welding wires with the patent number of 202010907383.6 and the invention name of C02 gas shielded welding wires and wire rods with the tensile strength of 650MPa for coating-free weathering steel bridges, and shielding gas is CO2. The process parameters of the gas shielded welding were kept at a current of 170A, a voltage of 24V, a welding speed of 40cm/min, a shielding gas flow of 14L/min, and a linear energy of 12KJ/cm, as in example 2.
Comparative example 6
A process method for Q500qENH weathering steel composite butt welding in alpine regions is characterized in that welding wires used for welding and filling in the step (5) are 202010907395.9 and named as' coating-free weathering steel bridge submerged arc automatic welding wires and wire rods with 650MPa tensile strength, and a matched welding flux is SJ105 Nq. The process parameters of the automatic submerged arc welding are that the current is kept at 620A, the voltage is 28V, the welding speed is 45cm/min, and the linear energy is 28KJ/cm, and the rest is the same as the example 2.
Comparative example 7
A process method for composite butt welding of Q500qENH weathering steel in alpine regions is characterized in that the flux matched in the step (5) is SJ101, and the rest is the same as that in the example 2.
Comparative example 8
A process method for Q500qENH weathering steel composite butt welding in alpine regions is the same as the embodiment 2 except that no liner is added at the bottom of a groove during welding.
Comparative example 9
A process method for Q500qENH weathering steel composite butt welding in alpine regions is the same as that in the embodiment 2 except that a solid ceramic liner is added at the bottom of a groove during welding.
Comparative example 10
Q500qENH weathering steel composite butt welding in alpine regionThe process method of (1) is that the gasket added at the bottom of the groove is only CO during welding2The ceramic lining of the chamber occurs, as in example 2.
Comparative example 11
A process method for Q500qENH weathering steel composite butt welding in alpine regions is the same as the embodiment 2 except that a liner added at the bottom of a groove is a ceramic liner only with a bottom heat absorption cavity during welding.
Comparative example 12
A process method for Q500qENH weathering steel composite butt welding in alpine regions is characterized in that a groove angle alpha is 45 degrees, and the height of a truncated edge is 1 mm; the rest is the same as example 6.
Comparative example 13
A technological method for Q500qENH weathering steel composite butt welding in alpine regions is characterized in that a groove angle alpha is 65 degrees, and a truncated edge height H is 3 mm; the rest is the same as example 6.
Comparative example 14
A process method for Q500qENH weathering steel composite butt welding in alpine regions is characterized in that the center of a truncated edge is positioned on the central line of a steel plate, so that an X shape is in a groove shape with equal-size and symmetrical upper and lower parts; the rest is the same as example 6.
Comparative example 15
A process method for Q500qENH weathering steel composite butt welding in alpine regions is characterized in that the temperature between the base layer in the step (4) and the welding filling layer in the step (5) in the step (6) is controlled at 70 ℃, and the rest is the same as that in the example 6.
Comparative example 16
A process method for Q500qENH weathering steel composite butt welding in alpine regions is characterized in that the temperature between the base layer in the step (4) and the welding filling layer in the step (5) in the step (6) is controlled at 190 ℃, and the rest is the same as in the example 6.
Comparative example 17
A process method for Q500qENH weathering steel composite butt welding in alpine regions is characterized in that gas shielded welding is used for backing in the step (4), welding wires are the welding wires with the patent number of 202010907383.6 and the invention name of C02 gas shielded welding wires and wire rods with the tensile strength of 650MPa for coating-free weathering steel bridges, and shielding gas is CO2. The gas shielded arc welding toolThe process parameters were kept at a current of 170A, a voltage of 24V, a welding speed of 40cm/min, a shielding gas flow of 14L/min, and a linear energy of 12KJ/cm, as in example 6.
Comparative example 18
A process method for Q500qENH weathering steel composite butt welding in alpine regions is characterized in that welding wires used for welding and filling in the step (5) are 202010907395.9 and named as' coating-free weathering steel bridge submerged arc automatic welding wires and wire rods with 650MPa tensile strength, and a matched welding flux is SJ105 Nq. The process parameters of the automatic submerged arc welding are that the current is kept at 620A, the voltage is 28V, the welding speed is 45cm/min, the linear energy is 28KJ/cm, and the rest is the same as the example 6.
Comparative example 19
A process method for composite butt welding of Q500qENH weathering steel in alpine regions is characterized in that the flux matched in the step (5) is SJ101, and the rest is the same as that in the example 6.
Comparative example 20
A process method for Q500qENH weathering steel composite butt welding in alpine regions is the same as that in the embodiment 6 except that no liner is added at the bottom of a groove during welding.
Comparative example 21
A process method for Q500qENH weathering steel composite butt welding in alpine regions is the same as that in example 6, wherein a solid ceramic liner is added at the bottom of a groove during welding.
Comparative example 22
A composite butt welding process for the Q500qENH weathering steel in high-cold area features that only CO is added to the liner at the bottom of bevel2The ceramic lining of the chamber occurs, as in example 6.
Comparative example 23
A process method for Q500qENH weathering steel composite butt welding in alpine regions is the same as that in example 6 except that a liner added at the bottom of a groove is a ceramic liner only with a bottom heat absorption cavity.
Detection and analysis:
the welding was carried out according to the procedure described in the examples and comparative examples, maintaining a relative humidity of 80% at 0 ℃ and 25 ℃ respectively. The thickness of the welded Q500qENH weather-resistant steel plate is 20mm +20mm, the Q500qENH weather-resistant steel plate with the specification is welded, and various physical and mechanical properties of a welded joint are tested: yield strength, tensile strength, elongation percentage, KV2 low-temperature impact energy at-40 ℃. The welding was repeated 5 times for each of the examples and comparative examples, and the physical mechanical properties were averaged.
Wherein, the test method of the yield strength, the tensile strength and the elongation rate is GB/T2652 and 2008 'weld joint and deposited metal tensile test method'; the testing method of the low-temperature impact energy of KV2 at the temperature of minus 40 ℃ is GB/T2650-2008 'welding joint impact test method'.
The specification of the groove, the control of the temperature between the roads, the selection of welding materials and welding flux and process parameters are preferably obtained after a large number of experiments, and the improved gasket is matched, so that the Q500qENH high-performance weather-resistant bridge steel can have excellent low-temperature toughness, crack resistance and weather resistance under the conditions of no preheating before welding and no heat treatment after welding, the welding joint has higher impact toughness reserve and safety margin, the key technical requirements of manufacturing a large-span bridge steel structure in a high-cold area can be completely met, the production efficiency is improved, the energy consumption is reduced, and the welding method is particularly suitable for welding the steel for the thick plate structure of the high-strength bridge engineering;
meanwhile, as can be seen from the above table, the welding process of the invention can weld the Q500qENH high-performance weather-resistant bridge steel when the ambient temperature is 0 ℃ and the relative humidity reaches 80%, and the low-temperature impact toughness still keeps higher safety margin under the conditions of no preheating before welding and no heat treatment after welding, can adapt to the climate characteristics of Sichuan-Tibet areas, and is simple and convenient to operate, convenient to apply, efficient and energy-saving; the invention can meet the technical requirements of the matching welding of a new generation of high-strength, high-toughness and high-weatherability bridge steel grade in China, and fills the blank of the welding process manufacturing technology in the severe cold areas proposed in China;
the key control point of the invention lies in the control of the inter-laneThe temperature is 80-180 ℃, wherein the liner has the functions of bearing and heat conduction, and the liner is provided with CO2The generation chamber can release CO from the bottom layer of the welded joint2The protective gas is used as protective gas to realize the omnibearing protection of welding, so that the welding quality of gas shielded welding is improved; the bottom heat absorption cavity arranged on the liner can further absorb welding heat, reduce the inter-channel temperature, simultaneously has the function of relieving the too high temperature reduction speed of a welding joint, is beneficial to the generation of a bainite structure and an acicular ferrite structure, improves the control of the inter-channel temperature by the process disclosed by the invention, and greatly improves the quality of the whole welding process; meanwhile, the invention can prevent the welding line from being overheated and blackened, is beneficial to the generation of acicular ferrite tissues of the welding line, enhances various performances of a welding joint and is particularly suitable for welding weather-resistant bridge steel in alpine regions.
The second process method for the Q500qENH weathering steel composite butt welding in the alpine region is extremely effective for thick plates, welding is carried out on Q500qENH weathering steel plates with the thickness of 50mm +50mm and 80mm +80mm, and the physical and mechanical properties of the steel plates also follow the rules in the table.
And finally: the above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that are within the spirit and principle of the present invention are intended to be included in the scope of the present invention.
Claims (10)
1. A process method for Q500qENH weathering steel composite butt welding in alpine regions is characterized by comprising the following steps: the process method comprises the following steps:
(I) pretreatment of the weld face
(1) Polishing the welding surface and the adjacent area to remove impurities such as rust on the surface;
(II) cutting treatment of welding surface
(2) When the plate thickness is less than or equal to 20mm, the groove adopts a Y-shaped symmetrical groove, the angle of the groove is 50-60 degrees, and the height of the truncated edge is 2 mm;
(3) polishing again to remove metal scraps, and butting the truncated edges at the two sides together in a Y-shaped lower half sample;
(III) composite butt welding forming process
(4) And (3) welding and bottoming: the priming adopts a welding wire with the tensile strength of deposited metal being more than or equal to 650MPa, and gas shielded welding is adopted for priming;
(5) welding and filling: welding and filling the residual area, and filling by adopting a welding wire and a matched welding flux with the tensile strength of deposited metal being more than or equal to 650MPa by a submerged arc automatic welding method;
(6) and (3) controlling the inter-channel temperature of the priming layer in the step (4) and the welding filling layer in the step (5) to be 80-180 ℃.
2. The composite butt welding process method for the Q500qENH weathering steel in the alpine region according to claim 1, characterized by comprising the following steps: the welding wire is JQ.TH 650 EW-II or 202010907383.6 in the gas shielded welding used for the welding and backing in the step (4), and the shielding gas is CO in the invention named as C02 gas shielded welding wire and wire rod with 650MPa tensile strength for coating-free weather-resistant steel bridges2(ii) a The technological parameters of the gas shielded welding are that the current is kept between 180A and 280A, the voltage is kept between 25V and 30V, the welding speed is kept between 30cm/min and 35cm/min, the flow of the shielding gas is kept between 15L/min and 25L/min, and the linear energy is kept between 14KJ/cm and 16 KJ/cm.
3. The composite butt welding process method for the Q500qENH weathering steel in the alpine region according to claim 1, characterized by comprising the following steps: the welding wire used for the welding and filling in the step (5) is SD-H08Mn2E or a welding wire with the patent number of 202010907395.9 and the invention name of 'coating-free weather-resistant steel bridge submerged arc automatic welding wire and wire rod with the tensile strength of 650MPa grade', and the matched welding flux is SJ105 Nq; the technological parameters of the automatic submerged arc welding are that the current is kept between 650A and 700A, the voltage is kept between 30V and 35V, the welding speed is kept between 35cm/min and 40cm/min, and the linear energy is kept between 30KJ/cm and 32 KJ/cm.
4. A process method for Q500qENH weathering steel composite butt welding in alpine regions is characterized by comprising the following steps: the process method comprises the following steps:
(I) pretreatment of the weld face
(1) Polishing the welding surface and the adjacent area to remove impurities such as rust on the surface;
(II) cutting treatment of welding surface
(2) When the plate thickness is more than or equal to 20mm, the groove adopts an X-shaped asymmetric groove, the height of the truncated edge is 2mm, and the upper edge of the truncated edge is positioned on the central line of the steel plate, so that the X-shaped asymmetric groove is in a shape with a large upper end and a small lower end; the bevel angle at two sides is 50-60 degrees;
(3) polishing again to remove metal scraps, and butting X-shaped truncated edges at two sides together;
(III) composite butt welding forming process
(4) And (3) welding and bottoming: the priming adopts a welding wire with the tensile strength of deposited metal being more than or equal to 650MPa, and gas shielded welding is adopted for priming;
(5) welding and filling: welding and filling the residual area, and filling by adopting a welding wire and a matched welding flux with the tensile strength of deposited metal being more than or equal to 650MPa by a submerged arc automatic welding method;
(6) controlling the inter-channel temperature of the priming layer in the step (4) and the welding filling layer in the step (5) to be 80-180 ℃;
(7) after the upper end groove of the X-shaped asymmetric groove is welded by the process, the steel plate is turned over, and then the lower end groove of the X-shaped asymmetric groove is continuously welded.
5. The composite butt welding process method for Q500qENH weathering steel in alpine regions according to claim 4, characterized by comprising the following steps: the welding wire is JQ.TH 650 EW-II or 202010907383.6 in the gas shielded welding used for the welding and backing in the step (4), and the shielding gas is CO in the invention named as C02 gas shielded welding wire and wire rod with 650MPa tensile strength for coating-free weather-resistant steel bridges2(ii) a The technological parameters of the gas shielded welding are that the current is kept between 180A and 280A, the voltage is kept between 25V and 30V, the welding speed is kept between 30cm/min and 35cm/min, the flow of the shielding gas is kept between 15L/min and 25L/min, and the linear energy is kept between 14KJ/cm and 16 KJ/cm.
6. The composite butt welding process method for Q500qENH weathering steel in alpine regions according to claim 4, characterized by comprising the following steps: the welding wire used for the welding and filling in the step (5) is SD-H08Mn2E or a welding wire with the patent number of 202010907395.9 and the invention name of 'coating-free weather-resistant steel bridge submerged arc automatic welding wire and wire rod with the tensile strength of 650MPa grade', and the matched welding flux is SJ105 Nq; the technological parameters of the automatic submerged arc welding are that the current is kept between 650A and 700A, the voltage is kept between 30V and 35V, the welding speed is kept between 35cm/min and 40cm/min, and the linear energy is kept between 30KJ/cm and 32 KJ/cm.
7. The composite butt welding process method for Q500qENH weathering steel in alpine regions according to any one of claims 1-6, characterized by comprising the following steps: in the process, before the third step of composite butt welding forming process is used for welding, a liner is added at the bottom of the groove, and the liner can adapt to the shape of the groove.
8. The process method for the Q500qENH weathering steel composite butt welding in the alpine region according to claim 7, characterized in that: the pad comprises a first load bearing area (1), a second load bearing area (2) and a heat dissipation area (3), wherein the heat dissipation area (3) consists of 3 layers: the uppermost layer is a microporous breathable layer (31), the middle layer is a bearing sealing layer (32), and the lowermost layer is a bottom sealing layer (33); the microporous gas-permeable layer (31) and the load-bearing sealing layer (32) form CO2A generation chamber (4), said CO2The generation cavity (4) is provided with a material which can be decomposed by heat to release CO2Of the substance of (1), said CO2A sealing plate (41) which can be opened and closed and sealed is arranged on the side of the generating cavity (4); the bearing sealing layer (32) and the bottom sealing layer (33) form a bottom heat absorption cavity (5), and reversible heat absorption substances are filled in the bottom heat absorption cavity (5).
9. The process method for the Q500qENH weathering steel composite butt welding in the alpine region according to claim 8, characterized in that: the thermally decomposable release of CO2The substance of (1) is sodium bicarbonate, and the reversible endothermic substance is sodium sulfate decahydrate.
10. The process method for the Q500qENH weathering steel composite butt welding in the alpine region according to claim 8, characterized in that: the material of the liner is ceramic or steel.
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