CN102601502B - Re-nanocrystallization welding device for nanometer bainite steel and method - Google Patents
Re-nanocrystallization welding device for nanometer bainite steel and method Download PDFInfo
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- CN102601502B CN102601502B CN201210096057.7A CN201210096057A CN102601502B CN 102601502 B CN102601502 B CN 102601502B CN 201210096057 A CN201210096057 A CN 201210096057A CN 102601502 B CN102601502 B CN 102601502B
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Abstract
A re-nanocrystallization welding device for nanometer bainite steel and a method belong to the field of welding of high-strength steel and solve the problem of cold crack due to the fact that conventional weld joints of bainite steel and textures of heat affected zones are easily turned to be hard and brittle. Infrared electric heating plates are distributed on two sides of a weld joint of a workpiece, coolers are mounted on the upper end surfaces of the infrared electric heating plates, a plurality of single electric heating plates are arranged along the direction of the central line of the weld joint and are connected end to end, a temperature sensor is mounted at each of the front end and the rear end of each single electric heating plate and is close to a side surface of the weld joint, the temperature sensors and the coolers are connected with a lower computer by signal wires, and the lower computer is connected with an upper computer by a signal wire. The weld joint and high-temperature metal in a heat affected zone are quickly cooled down, the temperature of the weld joint and the temperature of the high-temperature metal in the heat affected zone are reduced to a bainite phase change interval before ferrite phase change and pearlite phase change are caused, isothermal treatment is carried out for a certain period of time, and the weld joint and a texture of the heat affected zone are converted into nanometer bainite textures assuredly. The re-nanocrystallization welding device and the method are used for welding.
Description
Technical field
The present invention relates to a kind of bainitic steel welder and method, be specifically related to a kind of welder of nanometer again and method of nanometer bainitic steel, belong to high-strength steel welding field.
Background technology
Nanometer bainitic steel be exist at present have other steel grade of new generation of maximum intensity level, its ultimate tensile strength can reach 2.5GPa, yield strength reaches 1.7GPa, hardness is 600～700HV, fracture toughness is 30～40MPam
1/2, percentage elongation reaches 30% left and right.The phosphorus content of this steel is in 0.78% left and right, and the element silicon that contains certain content is to suppress separating out of carbide, be to obtain in a little higher than martensite transformation temperature (material is prepared holding temperature) isothermal transformation a couple of days (material is prepared required time), microstructure is the nano-sheet austenite (nanometer bainite structure) of the carbides-free nano-sheet bainite of separating out and residual a large amount of carbons of solid solution.Because carbon equivalent is very high, the weldability extreme difference of this steel, the performance of welding point is compared severe exacerbation with mother metal, and its conventional welding line and heat affected area are organized and are very easily changed hard crisp martensitic structure into, thereby cause the generation of cold crack.In the world to the also rare research of the Welding Problems of this steel, the welding of nanometer bainitic steel more than 1500MPa level has no report especially at present.
Summary of the invention
The object of the invention is to organize and very easily change hard crisp martensitic structure in order to solve conventional welding line and heat affected area, thereby cause the problem of cold crack, and then a kind of welder of nanometer again and method of nanometer bainitic steel are provided.
Technical scheme one of the present invention is: the welder of nanometer again of nanometer bainitic steel comprises Combination Welding workbench, slave computer, host computer, a plurality of front temperature sensor, a plurality of rear temperature sensor, two groups of infrared electric-heating sheets, a plurality of cooler and two fixtures;
The both sides of workpiece respectively adopt a fixture clamping on welding job platform, the both sides of workpiece weld seam are respectively furnished with one group of infrared electric-heating sheet, two groups of infrared electric-heating sheets are arranged symmetrically with along axis of a weld, every group of infrared electric-heating sheet comprises that a plurality of electric heating sheets are individual, a plurality of electric heating sheets individualities are arranged along axis of a weld direction, two adjacent electric heating sheets individualities join end to end, the front end of the individual side near weld seam of each electric heating sheets is provided with a front temperature sensor, temperature sensor after the rear end of the individual side near weld seam of each electric heating sheets is provided with one, each electric heating sheets individuality top is provided with a cooler near a side of weld seam, temperature sensor before each, after each, temperature sensor is all connected with slave computer by holding wire with each cooler, between slave computer and host computer, by holding wire, be connected.
Technical scheme two of the present invention is: the welding method of nanometer again of nanometer bainitic steel, and the concrete steps of the method are:
Step a: according to selecting CCT of welding figure corresponding to welding material, determine corresponding austenite transformation temperature Ac
1, bainite transformation temperature Bs, martensite transformation temperature Ms and do not produce the critical cooling rate ν of pearlite P;
Step b: according to welding condition, measure corresponding field of welding temperature, determine under its quasi stationary temperature field on axis of a weld between electric arc central peak temperature spot O and rear, molten bath bainite transformation temperature Bs point that distance is L1; Distance on axis of a weld between electric arc central peak temperature spot O and rear, molten bath martensite transformation temperature Ms point is L2, sets normal and the Ac of the axis of a weld of the peak temperature point O of arc center
1isothermal intersection point is Q, and the peak temperature point O of arc center is L3 to the air line distance between intersection point Q, and the length of electric heating sheets individuality is chosen as L2-L1, and electric heating sheets individuality inner side is L3 apart from the vertical range of axis of a weld;
Step c: the power according to not producing pearlitic critical cooling rate ν and the definite cooler of sweating heat input, guarantees that the weld seam of postwelding is cooled fast to bainitic transformation temperature range;
Steps d: the switch of the two groups of infrared electric-heating sheets of temperature field information timely adjustment that feed back by front temperature sensor and rear temperature sensor, welding weld seam and quench zone is afterwards incubated at preset temperature, before welding starts, open two groups of infrared electric-heating sheet switch butt welded seams and be preheating to 200 ℃, then Close All, after welding starts, when Current Temperatures Sensor monitoring starts to decline to weld seam temperature, slave computer sends instruction starts working cooler, to workpiece, carry out cooling, when the weld seam of rear temperature sensor monitors and heat affected area temperature are during lower than Ms+20 ℃, slave computer sends instruction quits work cooler, make infrared electric-heating sheet start heating simultaneously, when Current Temperatures Sensor monitoring surpasses Bs-20 ℃ to weld seam and heat affected area temperature, slave computer sends instruction quits work infrared electric-heating sheet, and so forth, when whole weld seam and heat affected area are all after between Bs-20 ℃ to Ms+20 ℃, whole weldment is put into holding furnace to be incubated, holding temperature is material preparation temperature, temperature retention time is that material is prepared required time, the structural transformation that finally makes welding point is nanometer bainite structure.
Welding method in the technical program is that the welder of nanometer again of the nanometer bainitic steel based on described in technical scheme one is realized.
The present invention compared with prior art has following beneficial effect: adopt welder of the present invention and method to realize nanometer bainitic steel, particularly nanometer bainitic steel high-quality more than 1500MPa level welding, make nanometer bainitic steel organizing after welding fusing or influence of high austenizing temp again change nanometer bainite into, not only can control the generation of welding cold cracking, and can guarantee that the weld seam after welding is consistent with mother metal with quench zone tissue, guaranteed the performance of welding point, also given full play to the good mechanical property of nanometer bainite material, widened the application of material.
Accompanying drawing explanation
Fig. 1 is the overall structure figure of the welder of nanometer again of nanometer bainitic steel of the present invention, Fig. 2 is Combination Welding workbench 5, front temperature sensor 6, , rear temperature sensor 9, infrared electric-heating sheet 1, position annexation front view between cooler 2 and two fixtures 8, Fig. 3 is again that (in figure, 10 represent that pearlite forms critical chilling temperature curve with normal welding temperature curve comparison diagram in nanometer welding, 11 represent nanometer temperature curve again, 12 represent conventional weldering temperature curve, A represents austenite, B represents bainite, M represents martensite, P represents pearlite, Ac
1represent austenite transformation temperature, Ms represents martensite transformation temperature), Fig. 4 is that (in figure, 13 represent Ms thermoisopleth to conventional weldering temperature field pattern, and 14 represent Ac
1thermoisopleth, 15 represent Bs thermoisopleth, 16 represent welding center line).
The specific embodiment
The specific embodiment one: in conjunction with Fig. 1 and Fig. 2, present embodiment is described, the welder of nanometer again of the nanometer bainitic steel of present embodiment comprises Combination Welding workbench 5, slave computer 3, host computer 4, a plurality of front temperature sensor 6, a plurality of rear temperature sensor 9, two groups of infrared electric-heating sheets 1, a plurality of cooler 2 and two fixtures 8;
The both sides of workpiece 7 respectively adopt fixture 8 clampings on welding job platform 5, the both sides of workpiece 7 weld seams are respectively furnished with one group of infrared electric-heating sheet 1, two groups of infrared electric-heating sheets 1 are arranged symmetrically with along axis of a weld, every group of infrared electric-heating sheet 1 comprises that a plurality of electric heating sheets are individual, a plurality of electric heating sheets individualities are arranged along axis of a weld direction, two adjacent electric heating sheets individualities join end to end, the front end of the individual side near weld seam of each electric heating sheets is provided with a front temperature sensor 6, temperature sensor 9 after the rear end of the individual side near weld seam of each electric heating sheets is provided with one, each electric heating sheets individuality top is provided with a cooler 2 near a side of weld seam, temperature sensor 6 before each, after each, temperature sensor 9 is all connected with slave computer 3 by holding wire with each cooler 2, between slave computer 3 and host computer 4, by holding wire, be connected.
The specific embodiment two: in conjunction with Fig. 1 and Fig. 2, present embodiment is described, the cooler 2 of present embodiment is jet-propelled cooler.Other composition and annexation are identical with the specific embodiment one.
The specific embodiment three: in conjunction with Fig. 1 to Fig. 4, present embodiment is described, the concrete steps of the welding method of nanometer again of the nanometer bainitic steel of present embodiment are:
Step a: according to selecting CCT of welding figure (welding continuous cooling transformation (CCT) diagram) corresponding to welding material, determine corresponding austenite transformation temperature Ac
1, bainite transformation temperature Bs, martensite transformation temperature Ms and do not produce the critical cooling rate ν of pearlite P;
Step b: according to welding condition, measure corresponding field of welding temperature, determine under its quasi stationary temperature field on axis of a weld between electric arc central peak temperature spot O and rear, molten bath bainite transformation temperature Bs point that distance is L1; Distance on axis of a weld between electric arc central peak temperature spot O and rear, molten bath martensite transformation temperature Ms point is L2, sets normal and the Ac of the axis of a weld of the peak temperature point O of arc center
1isothermal intersection point is Q, and the peak temperature point O of arc center is L3 to the air line distance between intersection point Q, and the length of electric heating sheets individuality is chosen as L2-L1, and electric heating sheets individuality inner side is L3 apart from the vertical range of axis of a weld;
Step c: the power according to not producing pearlitic critical cooling rate ν and the definite jet-propelled cooler 2 of sweating heat input, guarantees that the weld seam of postwelding is cooled fast to bainitic transformation temperature range;
Steps d: the switch of the two groups of infrared electric-heating sheets 1 of temperature field information timely adjustment that feed back by front temperature sensor 6 and rear temperature sensor 9, welding weld seam and quench zone is afterwards incubated at preset temperature, before welding starts, open two groups of infrared electric-heating sheets, 1 switch butt welded seam and be preheating to 200 ℃, then Close All, after welding starts, Current Temperatures sensor 6 monitors weld seam temperature while starting to decline, slave computer 3 sends instruction starts working cooler 2, to workpiece 7, carry out cooling, when the weld seam of rear temperature sensor 9 monitorings and heat affected area temperature are during lower than Ms+20 ℃, slave computer 3 sends instruction quits work cooler 2, make infrared electric-heating sheet 1 start heating simultaneously, when Current Temperatures sensor 6 monitors weld seam and heat affected area temperature and surpasses Bs-20 ℃, slave computer 3 sends instruction quits work infrared electric-heating sheet 1, complete welding, and so forth, thereby guarantee that weld seam and quench zone after welding are incubated at preset temperature.
After welding finishes, when whole weld seam and heat affected area are all after between Bs-20 ℃ to Ms+20 ℃, whole weldment is put into holding furnace to be incubated, holding temperature is material preparation temperature, temperature retention time is that material is prepared required time, and the structural transformation that finally makes welding point is nanometer bainite structure.
Welding method in present embodiment is that the welder of nanometer again of the nanometer bainitic steel based on described in the specific embodiment one or two is realized.
The principle of the invention is: because nanometer bainite structure is other tissue of maximum intensity level existing at present, therefore only make the tissue of welding point after sweating heat process, still keep nanometer bainite structure, guarantee material property is loss not.Using for reference by suitable temperature (the bainite transformation temperature range of martensite transformation temperature) insulation to make tissue from the uniform austenite of composition, change the method for nanometer bainite (nanometer bainite material preparation process) into, by control the cooling course of welding in welding cooling procedure, make must organize through welding high temperature melting and austenitizing, through being cooled fast to the bainitic transformation temperature range of a little higher than martensite transformation temperature and being incubated processing, be finally converted into as organizing consistent nanometer bainite structure with mother metal, thereby guaranteed the premium properties of joint.
Claims (1)
1. the welding method of nanometer again of nanometer bainitic steel, the welder of nanometer again of nanometer bainitic steel comprises Combination Welding workbench (5), slave computer (3), host computer (4), a plurality of front temperature sensor (6), a plurality of rear temperature sensor (9), two groups of infrared electric-heating sheets (1), a plurality of cooler (2) and two fixtures (8), the both sides of workpiece (7) respectively adopt a fixture (8) clamping on welding job platform (5), the both sides of workpiece (7) weld seam are respectively furnished with one group of infrared electric-heating sheet (1), two groups of infrared electric-heating sheets (1) are arranged symmetrically with along axis of a weld, every group of infrared electric-heating sheet (1) comprises that a plurality of electric heating sheets are individual, a plurality of electric heating sheets individualities are arranged along axis of a weld direction, two adjacent electric heating sheets individualities join end to end, the front end of the individual side near weld seam of each electric heating sheets is provided with a front temperature sensor (6), temperature sensor (9) after the rear end of the individual side near weld seam of each electric heating sheets is provided with one, each electric heating sheets individuality top is provided with a cooler near a side of weld seam, temperature sensor (6) before each, after each, temperature sensor (9) is all connected with slave computer (3) by holding wire with each cooler (2), between slave computer (3) and host computer (4), by holding wire, be connected, it is characterized in that: the concrete steps of described method are as follows:
Step a: according to selecting CCT of welding figure corresponding to welding material, determine corresponding austenite transformation temperature Ac
1, bainite transformation temperature Bs, martensite transformation temperature Ms and do not produce the critical cooling rate ν of pearlite P;
Step b: according to welding condition, measure corresponding field of welding temperature, determine under its quasi stationary temperature field on axis of a weld between electric arc central peak temperature spot O and rear, molten bath bainite transformation temperature Bs point that distance is L1; Distance on axis of a weld between electric arc central peak temperature spot O and rear, molten bath martensite transformation temperature Ms point is L2, sets normal and the Ac of the axis of a weld of the peak temperature point O of arc center
1isothermal intersection point is Q, and the peak temperature point O of arc center is L3 to the air line distance between intersection point Q, and the length of electric heating sheets individuality is chosen as L2-L1, and electric heating sheets individuality inner side is L3 apart from the vertical range of axis of a weld;
Step c: the power according to not producing pearlitic critical cooling rate ν and the definite cooler (2) of sweating heat input, guarantees that the weld seam of postwelding is cooled fast to bainitic transformation temperature range;
Steps d: the switch of the two groups of infrared electric-heating sheets of temperature field information timely adjustment (1) that feed back by front temperature sensor (6) and rear temperature sensor (9), welding weld seam and quench zone is afterwards incubated at preset temperature, before welding starts, open two groups of infrared electric-heating sheets (1) switch butt welded seam and be preheating to 200 ℃, then Close All, after welding starts, Current Temperatures sensor (6) monitors weld seam temperature while starting to decline, slave computer (3) sends instruction starts working cooler (2), to workpiece (7), carry out cooling, when the weld seam of rear temperature sensor (9) monitoring and heat affected area temperature are during lower than Ms+20 ℃, slave computer (3) sends instruction quits work cooler (2), make infrared electric-heating sheet (1) start heating simultaneously, when Current Temperatures sensor (6) monitors weld seam and heat affected area temperature and surpasses Bs-20 ℃, slave computer (3) sends instruction quits work infrared electric-heating sheet (1), and so forth, when whole weld seam and heat affected area are all after between Bs-20 ℃ to Ms+20 ℃, whole weldment is put into holding furnace to be incubated, holding temperature is material preparation temperature, temperature retention time is that material is prepared required time, the structural transformation that finally makes welding point is nanometer bainite structure.
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| CN103862148B (en) * | 2014-04-01 | 2015-08-19 | 哈尔滨工业大学 | Nanometer bainitic steel Austenite Grain Refinement accelerates the method for nanometer again |
| CN105945444A (en) * | 2016-06-29 | 2016-09-21 | 中车青岛四方机车车辆股份有限公司 | Real-time monitoring method and system for incomplete welding |
| CN107052597B (en) * | 2016-12-20 | 2018-11-09 | 江苏大学 | A kind of method for laser welding and device making up dissimilar metal welding line bath temperature difference |
| CN112077419B (en) * | 2019-06-14 | 2021-11-09 | 南京理工大学 | Device and method for actively controlling temperature of arc additive manufacturing straight wall |
| CN111496429A (en) * | 2020-04-20 | 2020-08-07 | 唐山松下产业机器有限公司 | Welding system and welding data processing method |
| CN112251587B (en) * | 2020-10-23 | 2022-03-22 | 攀钢集团攀枝花钢铁研究院有限公司 | Heat treatment method for welded joint of bainite steel rail and eutectoid pearlite steel rail |
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| JP4853575B2 (en) * | 2009-02-06 | 2012-01-11 | Ｊｆｅスチール株式会社 | High strength steel pipe for low temperature excellent in buckling resistance and weld heat affected zone toughness and method for producing the same |
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