CN111992862A - Flash welding method for HRB600 high-strength hot-rolled steel bar - Google Patents
Flash welding method for HRB600 high-strength hot-rolled steel bar Download PDFInfo
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- CN111992862A CN111992862A CN202010714750.0A CN202010714750A CN111992862A CN 111992862 A CN111992862 A CN 111992862A CN 202010714750 A CN202010714750 A CN 202010714750A CN 111992862 A CN111992862 A CN 111992862A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 115
- 239000010959 steel Substances 0.000 title claims abstract description 115
- 238000003466 welding Methods 0.000 title claims abstract description 102
- 238000000034 method Methods 0.000 title claims abstract description 48
- 230000006698 induction Effects 0.000 claims abstract description 40
- 238000010438 heat treatment Methods 0.000 claims abstract description 37
- 238000001816 cooling Methods 0.000 claims abstract description 8
- 238000012423 maintenance Methods 0.000 claims abstract 4
- 238000009721 upset forging Methods 0.000 claims abstract 2
- 238000005498 polishing Methods 0.000 claims description 6
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 5
- 230000000149 penetrating effect Effects 0.000 claims description 5
- 229910001562 pearlite Inorganic materials 0.000 abstract description 9
- 229910001568 polygonal ferrite Inorganic materials 0.000 abstract description 9
- 229910000859 α-Fe Inorganic materials 0.000 abstract description 9
- 229910052799 carbon Inorganic materials 0.000 abstract description 4
- 239000010953 base metal Substances 0.000 description 11
- 230000000694 effects Effects 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
- 229910001566 austenite Inorganic materials 0.000 description 6
- 238000010276 construction Methods 0.000 description 6
- 238000005452 bending Methods 0.000 description 5
- 230000004927 fusion Effects 0.000 description 5
- 238000009864 tensile test Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 210000001519 tissue Anatomy 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 210000005067 joint tissue Anatomy 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
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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
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/04—Flash butt welding
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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
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/16—Resistance welding; Severing by resistance heating taking account of the properties of the material to be welded
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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
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/34—Preliminary treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/36—Auxiliary equipment
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Abstract
The invention discloses a flash welding method of HRB600 high-strength hot-rolled steel bars, which comprises the following steps: (1) pretreating the welding end face of the steel bar to be welded; (2) clamping and fixing the steel bar to be welded and adjusting the welding gap distance and the upsetting length; (3) setting flash welding technological parameters matched with the specifications of the steel bars to be welded; (4) starting a welding machine, and completing welding after sequentially carrying out welding area induction heating, flash discharge, pressure upset forging and pressure maintenance on the steel bar to be welded; (5) and air-cooling to room temperature after welding. The invention can realize the flash welding of the high-carbon equivalent HRB600 high-strength hot-rolled steel bar, and the welding joint is acicular ferrite, polygonal ferrite and pearlite with better obdurability, thereby meeting the requirements of quick, simple and reliable welding in the building industry.
Description
Technical Field
The invention belongs to the technical field of welding, and particularly relates to a flash welding method of HRB600 high-strength hot-rolled steel bars.
Background
In recent years, the rapid development of Chinese economic construction makes the construction industry put forward higher requirements on hot rolled steel bars. HRB600 high-strength steel bars with higher strength level are adopted to replace HRB400 steel bars to serve as steel bars for construction, so that the using amount of steel can be saved, the self weight of the structure can be reduced, the construction safety can be improved, and the steel bars are energy-saving, emission-reducing and environment-friendly. At present, the carbon equivalent Ceq of the HRB600 high-strength steel bars is calculated to be more than or equal to 0.50, and the steel bars belong to steel bars difficult to weld; meanwhile, as the strength and the plasticity of the base metal are good, the welding joint needs higher toughness. Aiming at the high-strength difficult-to-weld steel bars, the construction site is mainly connected through a mechanical sleeve, the technological process comprises the steps of steel bar end flattening and polishing, cold heading and coarsening, rib removing, tapping and sleeve butt joint, although the connection effect is reliable and durable, the process is complex and tedious, the efficiency is low, and the production cost is overhigh.
Flash butt welding is a simple, convenient, efficient and reliable automated solid-phase fusion welding process, and is widely applied to connection of common-grade steel bars (such as HRB 400). However, the flash welding process matched with the HRB600 of the high-strength high-carbon equivalent steel bar is not reported. Patent CN106112241B discloses a flash welding method for high corrosion resistance and high strength steel bars, which is only suitable for high alloy amount corrosion resistance steel bars, and has high alloy addition amount but low strength level, slow preheating before welding and low temperature requirement, and needs tempering to eliminate abnormal structures after welding, and the whole welding process has long time. The HRB600 high-strength steel bar has high carbon equivalent and the tensile strength of the base metal reaches more than 800MPa, and the strength of a welded joint is required to be far more than 800MPa after welding and the welded joint has good toughness. Therefore, it is necessary to develop a flash welding method for HRB600 high-strength hot-rolled steel bars, which meets the requirements of the construction industry for quick, simple and reliable welding.
Disclosure of Invention
The invention aims to provide a flash welding method of HRB600 high-strength hot-rolled steel bars, which is characterized in that flash welding process parameters matched with the specifications of the steel bars to be welded are found out through experiments, the flash welding process parameters comprise key process parameters such as induction heating temperature, induction heating time, flash heat, flash distance, flash time, flash speed, upsetting pressure and the like, and welding is completed after the processes of induction heating, flash discharge, pressure upsetting and pressure maintaining in a welding area. The welded joint is stable and reliable, the structure is acicular ferrite, polygonal ferrite and pearlite with good obdurability, and the requirements of JGJ 18-2003 'specification of steel bar welding and acceptance on the performance of the welded joint' are met.
In order to realize the invention, the technical scheme is as follows:
a flash welding method for HRB600 high-strength hot-rolled steel bars comprises the following steps:
(1) pre-welding pretreatment: polishing the end face of the steel bar to be welded, and removing rust and oxide skin to ensure that the steel bar is smooth and clean;
(2) clamping the steel bars to be welded: and clamping two end surfaces of the steel bar to be welded in the electrode chuck and penetrating through the induction coil, ensuring that the transverse rib of the steel bar to be welded is through and the longitudinal ribs are relatively parallel, controlling the contact gap distance of the two end surfaces to be 1-8mm, and adjusting the upsetting length to be 10-40 mm.
(3) Setting a flash welding process: the method comprises the following steps of setting matched welding processes according to different steel bar specifications, specifically:
the flash welding process of 10-14mm HRB600 steel bars comprises the following steps: the induction heating temperature is 900 ℃ and 950 ℃, the induction heating time is 3-8s, the flash heat is 15-50kJ, the flash distance is 5-10mm, the flash speed is 1.5-2.5mm/s, the upsetting pressure is 0.25-0.5MPa, the upsetting time is less than or equal to 0.5s, and the pressure maintaining time is 1-10 s.
The flash welding process of the 16-20mm HRB600 steel bar comprises the following steps: the induction heating temperature is 950-.
The flash welding process of HRB600 steel bars with the thickness of not less than 22mm comprises the following steps: the induction heating temperature is 1000-.
(4) And (3) switching on a power supply and starting a program, and completing welding after sequentially carrying out welding area induction heating, flash discharge, pressure upsetting and pressure maintaining processes on the steel bar to be welded.
(5) And air cooling the welded steel bars to room temperature.
The design of key flash welding process parameters in the present invention is explained as follows:
heating parameters are as follows: the high-temperature induction heating process can enable the welding area base metal structure to be completely austenitized in a short time, so that a semi-molten austenite structure can be obtained easily after subsequent flashing, and the flash fusion effect of the whole welding is improved. Setting the induction heating temperature of the steel bar of 10-14mm at 900-; the induction heating temperature of the steel bar with the thickness of 16-20mm is 950-; the induction heating temperature of the steel bar with the length of more than or equal to 22mm is 1000-1050 ℃, and the induction heating time is 15-25 s.
Flash heat: the flash heat determines the flash fusion effect of the welding sample, thereby influencing the welding seam binding force after upsetting. The flash heat is too small, the end part of the sample is not flashed to a semi-molten austenite state, and the fusion is insufficient after upsetting, so that the strength of the weld joint structure is insufficient; the flash heat is too large, the semi-molten austenite structure formed by flash is too much, the molten austenite structure is easy to splash and drip, the operation danger is increased, and the welding seam is attractive. Therefore, the flash heat quantity should be increased along with the increase of the specification of the steel bar and cannot be too large, namely, the flash heat quantity of the steel bar with the thickness of 10-14mm is 15-50 kJ; the flash heat of the 16-20mm steel bar is 50-85 kJ; the flash heat of the steel bar with the length of more than or equal to 22mm is 85-125 kJ.
Flash distance and flash speed: the flash duration is determined by the flash distance and the flash speed together, and if the flash duration is too short, the flash heating of the sample is insufficient, so that the bonding force of the welding seam after upsetting is influenced; too long a flash time results in a large amount of splashing and dripping of high temperature austenite for a long time, increasing the operational risk. Because the semi-molten austenite structure proportion needs to be ensured, the flashing distance is increased along with the increase of the specification of the steel bar, the flashing speed is gradually reduced, and the whole flashing time is continuously prolonged. The flashing distance of the 10-14mm steel bar is 5-10mm, and the flashing speed is 1.5-2.5 mm/s; the flashing distance of the 16-20mm steel bar is 10-18mm, and the flashing speed is 0.8-1.5 mm/s; the flash distance of the steel bar is more than or equal to 22mm and is 15-30mm, and the flash speed is 0.1-0.8 mm/s.
Upsetting parameters: including upset pressure, upset time, and pressure hold time. Enough upsetting pressure and shorter upsetting time can rapidly extrude redundant high-temperature austenitizing tissues, reduce axial temperature gradient and uniformly precipitate acicular ferrite. And a short-time pressure maintaining process is adopted after upsetting so as to ensure that the welding seam core is fully fused after upsetting, and the cooling phase change effect of the welded joint is improved, so that the joint tissue is acicular ferrite, polygonal ferrite and pearlite with better obdurability. The upsetting air pressure of the 10-14mm steel bar is 0.25-0.5MPa, the upsetting time is less than or equal to 0.5s, and the pressure maintaining time is 1-10 s; the upsetting air pressure of the 16-20mm steel bar is 0.5-0.85MPa, the upsetting time is less than or equal to 1s, and the pressure maintaining time is 8-18 s; the upsetting air pressure of the steel bar with the thickness of more than or equal to 22mm is 0.7-1.25MPa, the upsetting time is less than or equal to 1.5s, and the pressure maintaining time is 15-25 s.
Advantageous effects
Compared with the prior art, the invention has the beneficial effects that:
1. the welding joint has high strength, high toughness, reliability and safety, the operation process is simple and efficient, the automatic operation can be realized, and the applicability is strong. Meanwhile, the welding process does not need additional welding materials and connecting piece assistance, and cost is saved.
2. The welding zone is subjected to rapid high-temperature induction heating before welding, so that the tissue austenitization of the welding zone before welding can be ensured to be sufficient, the flash fusion effect in the welding process is improved, and the overall welding time is saved.
3. And immediately maintaining short-time upsetting pressure after welding to ensure that a welding area is fully fused and the cooling phase change effect is improved, wherein the tissues of the welding area are acicular ferrite, polygonal ferrite and pearlite with better toughness.
Drawings
FIG. 1 is a metallographic structure diagram of HRB600 steel bar base metal
FIG. 2 is the macroscopic structure diagram of the flash welded joint of the HRB600 steel bar in example 1
FIG. 3 is the metallographic structure diagram of the flash welded joint of HRB600 steel bar in example 1
FIG. 4 is a drawing of a tensile sample of the flash welding of the HRB600 steel bars in example 1
FIG. 5 is the flash welding cold bending sample drawing of HRB600 steel bar in example 1
Detailed Description
Technical solutions in the embodiments of the present invention will be described in detail below, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Taking flash welding of a certain grade of HRB600 high-strength steel bar as an example, the structure of the parent material is polygonal ferrite + pearlite, as shown in figure 1.
Example 1
Carrying out flash butt welding on HRB600 steel bars with diameter of 20 mm:
the HRB600 steel bar mainly comprises C0.25, Si 0.62, Mn 1.55, V0.15 and Ceq 0.52.
(1) Pre-welding pretreatment: polishing the end face of the steel bar to be welded, and removing rust and oxide skin to ensure that the steel bar is smooth and clean;
(2) clamping the steel bars to be welded: and clamping two end surfaces of the steel bar to be welded in the electrode chuck and penetrating through the induction coil, ensuring that the transverse rib of the steel bar to be welded is through and the longitudinal ribs are relatively parallel, controlling the contact gap distance of the two end surfaces to be 5mm, and adjusting the upsetting length to be 25 mm.
(3) Setting a flash welding process: the induction heating temperature is 980 ℃, the induction heating time is 15s, the flash heat is 75kJ, the flash distance is 16mm, the flash speed is 1.5mm/s, the upsetting pressure is 0.75MPa, the upsetting time is less than or equal to 1s, and the pressure maintaining time is 15 s.
(4) And (3) switching on a power supply and starting a program, and completing welding after sequentially carrying out welding area induction heating, flash discharge, pressure upsetting and pressure maintaining processes on the steel bar to be welded.
(5) And air cooling the welded steel bars to room temperature.
The macroscopic picture of the welded joint at low power can obviously show a welding seam area, a heat engine affected area and a base metal, and the metallographic structure is acicular ferrite, polygonal ferrite and pearlite with better obdurability, as shown in figure 2.
After the HRB600 steel bar is butt-welded, the tensile test is performed, the welded joint is intact, and a fracture occurs in the base material, as shown in fig. 3.
And (3) performing a cold bending test on the HRB600 steel bar subjected to butt welding, wherein the test is good and has no fracture, and a welded joint has no crack, as shown in figure 4.
Example 2
And (3) carrying out flash butt welding on the HRB600 steel bars with diameter 28mm specification:
the HRB600 steel bar mainly comprises C0.27, Si 0.71, Mn 1.35, V0.18 and Ceq 0.53.
(1) Pre-welding pretreatment: polishing the end face of the steel bar to be welded, and removing rust and oxide skin to ensure that the steel bar is smooth and clean;
(2) clamping the steel bars to be welded: and clamping two end surfaces of the steel bar to be welded in the electrode chuck and penetrating through the induction coil, ensuring that the transverse rib of the steel bar to be welded is through and the longitudinal ribs are relatively parallel, controlling the contact gap distance of the two end surfaces to be 8mm, and adjusting the upsetting length to be 40 mm.
(3) Setting a flash welding process: the induction heating temperature is 1040 ℃, the induction heating time is 22s, the flash heat is 120kJ, the flash distance is 30mm, the flash speed is 0.2mm/s, the upsetting pressure is 1.25MPa, the upsetting time is less than or equal to 1.5s, and the pressure maintaining time is 30 s.
(4) And (3) switching on a power supply and starting a program, and completing welding after sequentially carrying out welding area induction heating, flash discharge, pressure upsetting and pressure maintaining processes on the steel bar to be welded.
(5) And air cooling the welded steel bars to room temperature.
The macroscopic picture of the welded joint can obviously show a welding seam area, a heat engine influence area and a base metal, and the metallographic structure is acicular ferrite, polygonal ferrite and pearlite with better obdurability.
And (4) performing a tensile test on the HRB600 steel bar subjected to butt welding, wherein a welded joint is intact, and fracture occurs in a base metal.
And (3) performing a cold bending test on the HRB600 steel bar after butt welding, wherein the test is good and has no fracture, and a welded joint has no crack.
Example 3
Carrying out flash butt welding on HRB600 steel bars with diameter 12mm specification:
the HRB600 steel bar mainly comprises C0.24, Si 0.57, Mn 1.40, V0.14 and Ceq 0.50.
(1) Pre-welding pretreatment: polishing the end face of the steel bar to be welded, and removing rust and oxide skin to ensure that the steel bar is smooth and clean;
(2) clamping the steel bars to be welded: and clamping two end surfaces of the steel bar to be welded in the electrode chuck and penetrating through the induction coil, ensuring that the transverse rib of the steel bar to be welded is through and the longitudinal ribs are relatively parallel, controlling the contact gap distance of the two end surfaces to be 3mm, and adjusting the upsetting length to be 15 mm.
(3) Setting a flash welding process: the induction heating temperature is 920 ℃, the induction heating time is 6s, the flash heat is 40kJ, the flash distance is 8mm, the flash speed is 2.0mm/s, the upsetting pressure is 0.35MPa, the upsetting time is less than or equal to 0.5s, and the pressure maintaining time is 5 s.
(4) And (3) switching on a power supply and starting a program, and completing welding after sequentially carrying out welding area induction heating, flash discharge, pressure upsetting and pressure maintaining processes on the steel bar to be welded.
(5) And air cooling the welded steel bars to room temperature.
The macroscopic picture of the welded joint can obviously show a welding seam area, a heat engine influence area and a base metal, and the metallographic structure is acicular ferrite, polygonal ferrite and pearlite with better obdurability.
And (4) performing a tensile test on the HRB600 steel bar subjected to butt welding, wherein a welded joint is intact, and fracture occurs in a base metal.
And (3) performing a cold bending test on the HRB600 steel bar after butt welding, wherein the test is good and has no fracture, and a welded joint has no crack.
Therefore, the process method can realize the flash welding of HRB600 steel bars with different specifications, and the welded joint tissue is acicular ferrite, polygonal ferrite and pearlite with better obdurability. The strength of the welding joint is higher than that of the base metal, and the tensile test results are all broken from the base metal. The welding joint has good toughness, and no crack or even fracture occurs in a cold bending test.
The foregoing is merely a detailed description of the present application, and it should be noted that modifications and embellishments could be made by those skilled in the art without departing from the principle of the present application, and these should also be considered as the protection scope of the present application.
Claims (3)
1. A flash welding method of HRB600 high-strength hot-rolled steel bars is characterized in that: the flash welding method comprises the following steps:
(1) pre-welding pretreatment: polishing the end face of the steel bar to be welded, and removing rust and oxide skin to ensure that the steel bar is smooth and clean;
(2) clamping the steel bars to be welded: clamping two end surfaces of a steel bar to be welded in an electrode chuck and penetrating through an induction coil, ensuring that a transverse rib of the steel bar to be welded is through and longitudinal ribs are relatively parallel, controlling the contact gap distance of the two end surfaces to be 1-8mm, and adjusting the upsetting length to be 10-40 mm;
(3) setting a flash welding process: the method comprises the following steps of setting a matched welding process according to the specification of the steel bar:
the flash welding process of 10-14mm HRB600 steel bars comprises the following steps: induction heating with flash heat of 15-50kJ, flash distance of 5-10mm, flash speed of 1.5-2.5mm/s, upsetting pressure of 0.25-0.5MPa and upsetting time of less than or equal to 0.5s, and maintaining pressure after upsetting;
the flash welding process of the 16-20mm HRB600 steel bar comprises the following steps: induction heating is carried out, the flash heat is 50-85kJ, the flash distance is 10-18mm, the flash speed is 0.8-1.5mm/s, the upsetting air pressure is 0.5-0.85MPa, the upsetting time is less than or equal to 1s, and the pressure is maintained immediately after the upsetting is finished;
the flash welding process of HRB600 steel bars with the thickness of not less than 22mm comprises the following steps: induction heating is carried out, the flash heat is 85-125kJ, the flash distance is 15-30mm, the flash speed is 0.1-0.8mm/s, the upsetting air pressure is 0.7-1.25MPa, the upsetting time is less than or equal to 1.5s, and the pressure is maintained immediately after the upsetting is finished;
(4) switching on a power supply and starting a program, and completing welding after sequentially carrying out welding area induction heating, flash discharge, pressure upsetting and pressure maintaining processes on the steel bar to be welded;
(5) and air cooling the welded steel bars to room temperature.
2. The flash welding method for HRB600 high-strength hot-rolled steel bars as claimed in claim 1, wherein during induction heating, the induction heating time of HRB600 steel bars of 10-14mm is 3-8s, and the induction heating temperature is 900-950 ℃; the induction heating time of HRB600 steel bars with the thickness of 16-20mm is 8-15s, and the induction heating temperature is 950-; the induction heating time of HRB600 steel bars which are more than or equal to 22mm is 15-25s, and the induction heating temperature is 1000-.
3. A flash welding method for HRB600 high-strength hot-rolled steel bars as claimed in claim 1, wherein after the upset forging is completed, the HRB600 steel bars of 10-14mm are immediately subjected to pressure maintenance for 1-10 s; the HRB600 steel bars with the thickness of 16-20mm are immediately subjected to pressure maintenance for 8-18 s; the HRB600 steel bar with the diameter being more than or equal to 22mm is immediately subjected to pressure maintenance for 15-25 s.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113210820A (en) * | 2021-04-25 | 2021-08-06 | 成都交大焊接科技有限公司 | Flash welding method |
| CN115401299A (en) * | 2022-09-22 | 2022-11-29 | 东北大学 | Flash butt welding method for corrosion-resistant steel with yield strength of 600MPa under acid service environment |
| CN115502531A (en) * | 2022-11-01 | 2022-12-23 | 江苏省沙钢钢铁研究院有限公司 | Flash butt welding method for low-temperature steel bars |
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| CN106112241A (en) * | 2016-06-24 | 2016-11-16 | 江苏省沙钢钢铁研究院有限公司 | Flash welding method for high-corrosion-resistance high-strength steel bar |
| CN109676227A (en) * | 2019-01-04 | 2019-04-26 | 山东金恒力机械制造有限公司 | 900MPa high intensity loop chain pulsed flashing butt welding technique |
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| CN113210820A (en) * | 2021-04-25 | 2021-08-06 | 成都交大焊接科技有限公司 | Flash welding method |
| CN113210820B (en) * | 2021-04-25 | 2023-03-21 | 成都交大焊接科技有限公司 | Flash welding method |
| CN115401299A (en) * | 2022-09-22 | 2022-11-29 | 东北大学 | Flash butt welding method for corrosion-resistant steel with yield strength of 600MPa under acid service environment |
| CN115502531A (en) * | 2022-11-01 | 2022-12-23 | 江苏省沙钢钢铁研究院有限公司 | Flash butt welding method for low-temperature steel bars |
| CN115502531B (en) * | 2022-11-01 | 2023-10-27 | 江苏省沙钢钢铁研究院有限公司 | Flash butt welding method for low-temperature steel bars |
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Denomination of invention: A Flash Welding Method for HRB600 High Strength Hot Rolled Steel Bars Effective date of registration: 20230718 Granted publication date: 20220218 Pledgee: China Construction Bank Zhangjiagang branch Pledgor: INSTITUTE OF RESEARCH OF IRON & STEEL,SHAGANG,JIANGSU PROVINCE Registration number: Y2023980048904 |