CN102601502A - 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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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 the high-strength steel welding field.
Background technology
The 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 about 30%.The phosphorus content of this steel is about 0.78%; 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 preparation holding temperature) isothermal transformation a couple of days (material preparation required time), microstructure is the nano-sheet austenite (nanometer bainite structure) of 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 the nanometer bainitic steel that the 1500MPa level is above does not appear in the newspapers especially at present.
Summary of the invention
The objective of the invention is to organize and very easily change hard crisp martensitic structure into, thereby cause the problem of cold crack, and then a kind of welder of nanometer again and method of nanometer bainitic steel are provided in order to solve conventional welding line and heat affected area.
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 preceding temperature sensor, a plurality of backs temperature sensor, two groups of infrared ray electric heating plates, a plurality of cooler and two jigs;
The both sides of workpiece respectively adopt an anchor clamps clamping on the welding job platform; The both sides of workpiece weld seam respectively are furnished with one group of infrared ray electric heating plate; Two groups of infrared ray electric heating plates are along the axis of a weld symmetric arrangement; Every group of infrared ray electric heating plate comprises that a plurality of electric heating sheets are individual; A plurality of electric heating sheets individualities are arranged along the axis of a weld direction, and two adjacent electric heating sheets individualities join end to end, and each electric heating sheets individuality is equipped with a preceding temperature sensor near the front end of the side of weld seam; Temperature sensor after each electric heating sheets individuality is equipped with one near the rear end of the side of weld seam; Each electric heating sheets individuality top is equipped with a cooler near a side of weld seam, and temperature sensor, each back temperature sensor all are connected with slave computer through holding wire with each cooler before each, is connected through holding wire between slave computer and the host computer.
Technical scheme two of the present invention is: the welding method of nanometer again of nanometer bainitic steel, and the concrete steps of this method are:
Step a:, confirm corresponding austenite transformation temperature Ac according to selecting the corresponding welding CCT figure of welding material
1, bainite transformation temperature Bs, martensite transformation temperature Ms and do not produce the critical cooling rate v of pearlite P;
Step b: according to welding condition, measure corresponding field of welding temperature, confirm under its quasi stationary temperature field on the axis of a weld between the electric arc central peak temperature spot O and rear, molten bath bainite transformation temperature Bs point apart from being L1; Distance on the axis of a weld between electric arc central peak temperature spot O and rear, the molten bath martensite transformation temperature Ms point is L2, sets the 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 the intersection point Q, and the individual length of electric heating sheets is chosen as L2-L1, and the individual inboard vertical range apart from axis of a weld of electric heating sheets is L3;
Step c:, guarantee that the weld seam of postwelding is cooled fast to the bainitic transformation temperature range according to not producing the power that cooler is confirmed in the input of pearlitic critical cooling rate v and sweating heat;
Steps d: through the switch of preceding temperature sensor with two groups of infrared ray electric heating plates of temperature field information timely adjustment of back temperature sensor feedback; Welding weld seam and quench zone afterwards is incubated at preset temperature; Before the welding beginning; Open two groups of infrared ray electric heating plate switch butt welded seams and be preheating to 200 ℃, then Close All; After the welding beginning, the Current Temperatures sensor monitors weld seam temperature when beginning to descend, and slave computer sends instruction starts working cooler; Workpiece is cooled off, and when weld seam and the heat affected area temperature of back temperature sensor monitors were lower than Ms+20 ℃, slave computer sends instruction quit work cooler; Make the infrared ray electric heating plate begin heating simultaneously, the Current Temperatures sensor monitors weld seam and heat affected area temperature when surpassing Bs-20 ℃, and slave computer sends instruction quits work the infrared ray electric heating plate; So back and forth; After whole welding line and heat affected area all are between Bs-20 ℃ to Ms+20 ℃, whole weldment to be put into holding furnace be incubated, holding temperature is the material preparation temperature; Temperature retention time is the material preparation required time, and the structural transformation that finally makes welding point is the nanometer bainite structure.
Welding method in the present technique scheme is based on that the welder of nanometer again of the nanometer bainitic steel described in the technical scheme one realizes.
The present invention compared with prior art has following beneficial effect: adopt welder of the present invention and method to realize the nanometer bainitic steel; The particularly above nanometer bainitic steel high-quality welding of 1500MPa level; Make nanometer bainitic steel organizing after welding fusing or high temperature austeniteization change the nanometer bainite once more into; Not only can control the generation of welding cold cracking, and the weld seam after can guaranteeing to weld is consistent with mother metal with the quench zone tissue, has guaranteed the performance of welding point; Also give full play to nanometer bainite material excellent mechanical property, widened the application of material.
Description of drawings
Fig. 1 is the overall structure figure of the welder of nanometer again of nanometer bainitic steel of the present invention; Fig. 2 be Combination Welding workbench 5, preceding temperature sensor 6,, the position annexation front view between back temperature sensor 9, infrared ray electric heating plate 1, cooler 2 and two jigs 8, Fig. 3 is that (10 represent that pearlite form critical chilling temperature curve among the figure, and 11 represent nanometer temperature curve again with conventional welding temperature curve comparison diagram in nanometer welding again; The conventional weldering of 12 expressions temperature curve; A representes austenite, and B representes bainite, and M representes martensite; P representes pearlite, Ac
1The expression austenite transformation temperature, Ms representes martensite transformation temperature); Fig. 4 is conventional weldering temperature field pattern (13 expression Ms thermoisopleths among the figure, 14 expression Ac
1Thermoisopleth, 15 expression Bs thermoisopleths, 16 expression welding center lines).
The specific embodiment
The specific embodiment one: combine Fig. 1 and Fig. 2 that this embodiment is described, the welder of nanometer again of the nanometer bainitic steel of this embodiment comprise Combination Welding workbench 5, slave computer 3, host computer 4, a plurality of before temperature sensor 6, a plurality of temperature sensor afterwards 9, two groups of infrared ray electric heating plates 1, a plurality of cooler 2 and two jigs 8;
The both sides of workpiece 7 respectively adopt anchor clamps 8 clampings on welding job platform 5; The both sides of workpiece 7 weld seams respectively are furnished with one group of infrared ray electric heating plate 1; Two groups of infrared ray electric heating plates 1 are along the axis of a weld symmetric arrangement; Every group of infrared ray electric heating plate 1 comprises that a plurality of electric heating sheets are individual; A plurality of electric heating sheets individualities are arranged along the axis of a weld direction, and two adjacent electric heating sheets individualities join end to end, and each electric heating sheets individuality is equipped with a preceding temperature sensor 6 near the front end of the side of weld seam; Temperature sensor 9 after each electric heating sheets individuality is equipped with one near the rear end of the side of weld seam; Each electric heating sheets individuality top is equipped with a cooler 2 near a side of weld seam, and temperature sensor 6, each back temperature sensor 9 all are connected with slave computer 3 through holding wire with each cooler 2 before each, is connected through holding wire between slave computer 3 and the host computer 4.
The specific embodiment two: combine Fig. 1 and Fig. 2 that this embodiment is described, the cooler 2 of this embodiment is jet-propelled cooler.Other composition is identical with the specific embodiment one with annexation.
The specific embodiment three: combine Fig. 1 to Fig. 4 that this embodiment is described, the concrete steps of the welding method of nanometer again of the nanometer bainitic steel of this embodiment are:
Step a:, confirm corresponding austenite transformation temperature Ac according to selecting the corresponding welding CCT figure (welding continuous cooling transformation (CCT) diagram) of welding material
1, bainite transformation temperature Bs, martensite transformation temperature Ms and do not produce the critical cooling rate v of pearlite P;
Step b: according to welding condition, measure corresponding field of welding temperature, confirm under its quasi stationary temperature field on the axis of a weld between the electric arc central peak temperature spot O and rear, molten bath bainite transformation temperature Bs point apart from being L1; Distance on the axis of a weld between electric arc central peak temperature spot O and rear, the molten bath martensite transformation temperature Ms point is L2, sets the 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 the intersection point Q, and the individual length of electric heating sheets is chosen as L2-L1, and the individual inboard vertical range apart from axis of a weld of electric heating sheets is L3;
Step c:, guarantee that the weld seam of postwelding is cooled fast to the bainitic transformation temperature range according to not producing the power that jet-propelled cooler 2 is confirmed in the input of pearlitic critical cooling rate v and sweating heat;
Steps d: through the switch of preceding temperature sensor 6 with two groups of infrared ray electric heating plates 1 of temperature field information timely adjustment of back temperature sensor 9 feedbacks; Welding weld seam and quench zone afterwards is incubated at preset temperature; Before the welding beginning; Open two groups of infrared ray electric heating plates, 1 switch butt welded seam and be preheating to 200 ℃, then Close All; After the welding beginning, Current Temperatures sensor 6 monitors weld seam temperature when beginning to descend, and slave computer 3 sends instruction starts working cooler 2; Workpiece 7 is cooled off, and when the weld seam of back temperature sensor 9 monitoring and heat affected area temperature were lower than Ms+20 ℃, slave computer 3 sends instruction quit work cooler 2; Make infrared ray electric heating plate 1 begin heating simultaneously; Current Temperatures sensor 6 monitors weld seam and heat affected area temperature when surpassing Bs-20 ℃, and slave computer 3 sends instruction quits work infrared ray electric heating plate 1, accomplishes welding; So reciprocal, thus guarantee that weld seam and quench zone after the welding are incubated at preset temperature.
After welding finishes; After whole welding line and heat affected area all are between Bs-20 ℃ to Ms+20 ℃; Whole weldment is put into holding furnace to be incubated; Holding temperature is the material preparation temperature, and temperature retention time is the material preparation required time, and the structural transformation that finally makes welding point is the nanometer bainite structure.
Welding method in this embodiment is based on that the welder of nanometer again of the nanometer bainitic steel described in the specific embodiment one or two realizes.
The principle of the invention is: because the nanometer bainite structure is other tissue of maximum intensity level that exists at present, therefore only make the tissue of welding point after the sweating heat process, still keep the nanometer bainite structure, could guarantee not loss of material property.Using for reference through suitable temperature (the bainite transformation temperature range of martensite transformation temperature) insulation to make tissue change the method for nanometer bainite (nanometer bainite material preparation process) into from the uniform austenite of composition; Through control welding cooling course in the welding cooling procedure; Make through welding high temperature melting and austenitizing and must organize; 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 and be the nanometer bainite structure consistent, thereby guaranteed the premium properties of joint with the mother metal tissue.
Claims (3)
1. the welder of nanometer again of a nanometer bainitic steel is characterized in that: the welder of nanometer again of nanometer bainitic steel comprise Combination Welding workbench (5), slave computer (3), host computer (4), a plurality of before temperature sensor (6), a plurality of backs temperature sensor (9), two groups of infrared ray electric heating plates (1), a plurality of cooler (2) and two jigs (8);
The both sides of workpiece (7) respectively adopt anchor clamps (8) clamping on welding job platform (5); The both sides of workpiece (7) weld seam respectively are furnished with one group of infrared ray electric heating plate (1); Two groups of infrared ray electric heating plates (1) are along the axis of a weld symmetric arrangement; Every group of infrared ray electric heating plate (1) comprises that a plurality of electric heating sheets are individual; A plurality of electric heating sheets individualities are arranged along the axis of a weld direction, and two adjacent electric heating sheets individualities join end to end, and each electric heating sheets individuality is equipped with a preceding temperature sensor (6) near the front end of the side of weld seam; Temperature sensor (9) after each electric heating sheets individuality is equipped with one near the rear end of the side of weld seam; Each electric heating sheets individuality top is equipped with a cooler near a side of weld seam, and temperature sensor (6), each back temperature sensor (9) all are connected with slave computer (3) through holding wire with each cooler (2) before each, is connected through holding wire between slave computer (3) and the host computer (4).
2. the welder of nanometer again of nanometer bainitic steel according to claim 1 is characterized in that: cooler (2) is jet-propelled cooler.
3. carry out the welding method of nanometer again of nanometer bainitic steel based on the welder of nanometer again of claim 1 or 2 described nanometer bainitic steels, it is characterized in that: the concrete steps of this method are:
Step a:, confirm corresponding austenite transformation temperature Ac according to selecting the corresponding welding CCT figure of welding material
1, bainite transformation temperature Bs, martensite transformation temperature Ms and do not produce the critical cooling rate v of pearlite P;
Step b: according to welding condition, measure corresponding field of welding temperature, confirm under its quasi stationary temperature field on the axis of a weld between the electric arc central peak temperature spot O and rear, molten bath bainite transformation temperature Bs point apart from being L1; Distance on the axis of a weld between electric arc central peak temperature spot O and rear, the molten bath martensite transformation temperature Ms point is L2, sets the 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 the intersection point Q, and the individual length of electric heating sheets is chosen as L2-L1, and the individual inboard vertical range apart from axis of a weld of electric heating sheets is L3;
Step c:, guarantee that the weld seam of postwelding is cooled fast to the bainitic transformation temperature range according to not producing the power that cooler (2) is confirmed in the input of pearlitic critical cooling rate v and sweating heat;
Steps d: through two groups of infrared ray electric heating plate (switches of 10 of temperature field information timely adjustment of preceding temperature sensor (6) and back temperature sensor (9) feedback; Welding weld seam and quench zone afterwards is incubated at preset temperature; Before the welding beginning; Open two groups of infrared ray electric heating plates (1) switch butt welded seam and be preheating to 200 ℃, then Close All; After the welding beginning, Current Temperatures sensor (6) monitors weld seam temperature when beginning to descend, and slave computer (3) sends instruction starts working cooler (2); Workpiece (7) is cooled off; When weld seam and the heat affected area temperature of back temperature sensor (9) monitoring were lower than Ms+20 ℃, slave computer (3) sends instruction quit work cooler (2), makes infrared ray electric heating plate (1) begin heating simultaneously; Current Temperatures sensor (6) monitors weld seam and heat affected area temperature when surpassing Bs-20 ℃; Slave computer (3) sends instruction quits work infrared ray electric heating plate (1), so back and forth, and after whole welding line and heat affected area all are between Bs-20 ℃ to Ms+20 ℃; Whole weldment is put into holding furnace to be incubated; Holding temperature is the material preparation temperature, and temperature retention time is the material preparation required time, and the structural transformation that finally makes welding point is the nanometer bainite structure.
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| CN201210096057.7A CN102601502B (en) | 2012-04-01 | 2012-04-01 | Re-nanocrystallization welding device for nanometer bainite steel and method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103862148A (en) * | 2014-04-01 | 2014-06-18 | 哈尔滨工业大学 | Method of austenite grain refinement and re-nanocrystallization acceleration for nano-bainitic steel |
| 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 |
| CN107052597A (en) * | 2016-12-20 | 2017-08-18 | 江苏大学 | A kind of method for laser welding and device for making up dissimilar metal welding line bath temperature difference |
| 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 |
| CN112077419A (en) * | 2019-06-14 | 2020-12-15 | 南京理工大学 | Device and method for actively controlling temperature of arc additive manufacturing straight wall |
| CN112251587A (en) * | 2020-10-23 | 2021-01-22 | 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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| CN103862148A (en) * | 2014-04-01 | 2014-06-18 | 哈尔滨工业大学 | Method of austenite grain refinement and re-nanocrystallization acceleration for nano-bainitic steel |
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| CN107052597A (en) * | 2016-12-20 | 2017-08-18 | 江苏大学 | A kind of method for laser welding and device for making up dissimilar metal welding line bath temperature difference |
| CN112077419A (en) * | 2019-06-14 | 2020-12-15 | 南京理工大学 | Device and method for actively controlling temperature of arc additive manufacturing straight wall |
| 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 |
| CN112251587A (en) * | 2020-10-23 | 2021-01-22 | 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 |
| 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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