CN103028851A - Welding method, thermal treatment device and welding system - Google Patents
Welding method, thermal treatment device and welding system Download PDFInfo
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- CN103028851A CN103028851A CN2012104992488A CN201210499248A CN103028851A CN 103028851 A CN103028851 A CN 103028851A CN 2012104992488 A CN2012104992488 A CN 2012104992488A CN 201210499248 A CN201210499248 A CN 201210499248A CN 103028851 A CN103028851 A CN 103028851A
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Abstract
The invention discloses a welding method, which comprises the following steps: a welding step of welding parent materials (10) together and forming a welding joint (11); a thermal treatment step: cooling the material at the welding joint (11) from a predetermined temperature (T) to a lower bainite transformation-starting temperature (T0) of the parent materials (10); keeping the temperature of the material at the welding joint (11) to the lower bainite transformation-starting temperature (T0), wherein the heat preservation time is predetermined time (t). The invention further discloses a thermal treatment device (100) for carrying out the thermal treatment step and a welding system for carrying out the welding method. During welding, the welding joint is cooled to the bainite transformation-starting temperature for not generating a martensitic structure at the welding joint, so that the cold crack sensitivity of the welding joint is improved; and mechanical properties of the joint are improved.
Description
Technical field
The present invention relates to welding field, particularly, relate to annealing device and a kind of welding system of implementing described welding method of a kind of welding method and a kind of heat treatment step for implementing this welding method.
Background technology
Along with maximization and the heavy loading of modern project machinery, increasing high-strength steel Welding Structure is applied in the engineering machinery.But owing to contain more carbon and alloying element in the high-strength steel, carbon equivalent is higher, welding point very easily generates hardened structure when naturally cooling off, make the mechanical properties decrease of welding point, cold crack sensitiveness increases, thereby has seriously restricted the application of high-strength steel in Welding Structure.
For fear of the generation of hardened structure, usually to before welding, carry out preheating to mother metal to be welded, and after welding is finished, also will carry out the postwelding after heat.But too much inhomogeneous hot input can cause that welding point is softening, intensity descends, and also can increase welding deformation simultaneously.
Can not increase welding deformation when therefore, how the welding point place generates hardened structure after avoiding welding and become the technical problem that this area needs to be resolved hurrily.
Summary of the invention
The purpose of this invention is to provide a kind of welding method and a kind of welding system of implementing this welding method, this welding method can be avoided welding rear welding point place and be generated hardened structure, and can not increase welding deformation.
To achieve these goals, as one aspect of the present invention, provide a kind of welding method, wherein, the method comprises:
Welding step: mother metal is welded together, and form welding point;
Heat treatment step: make the material at described welding point place begin transition temperature from the lower bainite that predetermined temperature is cooled to described mother metal, the temperature of the material at described welding point place is remained on described lower bainite begin transition temperature, temperature retention time is the scheduled time.
Preferably, in described heat treatment step, the cooling velocity of the material at described welding point place is cooled to the minimum cooling velocity that begins perlitic transformation greater than described mother metal from welding temperature, so that the material at institute welding point place has part lower bainite tissue at least.
Preferably, in described heat treatment step, the cooling velocity of the material at described welding point place is greater than the critical cooling rate of described mother metal, so that the material at described welding point place all has the lower bainite tissue.
Preferably, described mother metal is high-strength steel.
Preferably, the described scheduled time is 10s to 50s.
As another aspect of the present invention, a kind of annealing device also is provided, this annealing device is used for implementing the described heat treatment step of above-mentioned welding method provided by the present invention, described annealing device comprises the hot processing chamber with opening, heat-treatment medium in this hot processing chamber can contact from described opening outflow and with described welding point, and the temperature of described heat-treatment medium is that the lower bainite of described mother metal begins transition temperature.
Preferably, described annealing device also comprises heat exchange chamber, this heat exchange chamber optionally is communicated with described hot processing chamber, and described heat-treatment medium is heated or cooled in described heat exchange chamber after described lower bainite begins transition temperature and sends into described hot processing chamber.
Preferably, described annealing device also comprises medium recovery device, and described medium recovery device is used for sending the heat-treatment medium of described hot processing chamber back to described heat exchange chamber.
Preferably, described annealing device comprises the housing that the lower end is open and holds the bath salt pond of described heat-treatment medium, this bath salt pond is arranged in the inner space of described housing, the part that is positioned at below, described bath salt pond in the described housing forms described hot processing chamber, described heat-treatment medium has the first gap between the sidewall in described bath salt pond and the described housing, so that can arrive described hot processing chamber by described the first gap.
Preferably, be provided with switch valve and/or filtration members in described the first gap.
Preferably, described medium recovery device comprises suction pump and is arranged on carrier pipe in the described bath salt pond, the lower end of this carrier pipe communicates with described hot processing chamber, and described suction pump is arranged in the described carrier pipe, so that the heat-treatment medium in the described hot processing chamber is recycled in the described bath salt pond.
Preferably, described medium recovery device also comprises the check valve that is arranged in the described carrier pipe, and this check valve is positioned at the below of described suction pump, only allows described heat-treatment medium to flow to the top of this check valve from the below of this check valve.
Preferably, described medium recovery device also comprises sleeve and gas source, described jacket casing is in described hull outside, and the top of described sleeve is connected with described housing seal, the below of described sleeve is open, and the lower limb of described sleeve surpasses the lower limb of described housing, and the gas that described gas source produces passes into the second gap between described sleeve and the described housing.
Preferably, described gas source can provide carbon dioxide.
Preferably, be provided with heater and cooling device in the described bath salt pond.
Preferably, described bath salt is provided with temperature sensor in the pond, and this temperature sensor is electrically connected with described heater and described cooling device.
Preferably, described annealing device also comprises medium feeding apparatus, and this medium feeding apparatus is used for that described heat exchange chamber is heated to the heat-treatment medium that described lower bainite begins transition temperature and is delivered to described hot processing chamber.
Preferably, the composition of described heat-treatment medium comprises KOH, NaOH and H
2O.
Preferably, the composition of described heat-treatment medium also comprises NaNO
2
Preferably, the composition of described heat-treatment medium also comprises Na
2CO
3
Preferably, in described heat-treatment medium, the weight ratio of KOH is 35-40%, and the weight ratio of NaOH is 40-45%, NaNO
2Weight ratio be 5-10%, Na
2CO
3Weight ratio be 5-8%, H
2The weight ratio of O is 10-13%.
As another aspect of the present invention, a kind of welding system is provided, wherein, this welding system is used for implementing above-mentioned welding method provided by the present invention, described welding system comprises be used to the welding gun of implementing described welding step with for the annealing device of implementing described heat treatment step, this annealing device and the welding gun that carries out described welding step are along the welding direction synchronizing moving, and described annealing device is above-mentioned annealing device provided by the present invention.
Preferably, the distance between the center of an end of the close described welding gun of described hot processing chamber and this welding gun is 30-50mm.
In when welding, welding point is cooled to bainite begins transition temperature so that the welding point place can not produce martensitic structure, thereby the cold crack sensitiveness at welding point place has improved the mechanical property of joint.
Other features and advantages of the present invention will partly be described in detail in the specific embodiment subsequently.
Description of drawings
Accompanying drawing is to be used to provide a further understanding of the present invention, and consists of the part of specification, is used from explanation the present invention with the following specific embodiment one, but is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the schematic diagram of welding method of the present invention, and this principle there is shown a kind of annealing device of embodiment;
Fig. 2 is the schematic diagram of welding method of the present invention, and this principle there is shown the annealing device of another kind of embodiment;
Fig. 3 is the cutaway view of the annealing device shown in Fig. 2;
Fig. 4 is the enlarged drawing at I place among Fig. 3;
Fig. 5 is the enlarged drawing at II place among Fig. 3;
Fig. 6 is the enlarged drawing at III place among Fig. 3;
Fig. 7 is the enlarged drawing at IV place among Fig. 3.
Description of reference numerals
10 mother metals, 11 welding points
100 annealing devices, 110 hot processing chambers
120 heat exchange chambers, 130 housings
140 bath salt ponds, 141 carrier pipes
142 check valves, 143 heaters
144 cooling devices, 145 temperature sensors
146 thermometers, 150 first gaps
160 suction pumps of 151 switch valves
170 sleeves, 171 second gaps
The 110a opening
The specific embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is elaborated.Should be understood that the specific embodiment described herein only is used for description and interpretation the present invention, is not limited to the present invention.
As one aspect of the present invention, as shown in Figure 1, provide a kind of welding method, wherein, the method comprises:
Welding step: mother metal 10 is welded together, and form welding point 11;
Heat treatment step: make the material at welding point 11 places from predetermined temperature T
1The lower bainite that is cooled to mother metal 10 begins transition temperature T
0, the temperature of the material at welding point 11 places is remained on lower bainite begins transition temperature T
0, temperature retention time is scheduled time t.
The lower bainite of material begins transition temperature T
0The martensite that is higher than material begins transition temperature, and therefore, after Welded Joints after the welding carried out described treatment step, welding point 11 places can produce lower bainite tissue and/or pearlitic structrure, and can not produce the martensite hardened structure.Lower bainite tissue and pearlitic structrure all have good toughness, thereby have reduced the risk of welding point place generation crackle.And Welded Joints 11 carries out described heat treatment step also can produce the thermal tension effect, thereby can effectively reduce the distortion at welding point 11 places.
In the present invention, described predetermined temperature T
1Can be the welding temperature in the described welding step, also can be lower than the welding temperature in the described welding step.Usually, described predetermined temperature T
1Can be than low 50 ℃ to 100 ℃ of the welding temperature in the described welding step.Different mother metals 10 has different lower bainites and begins transition temperature T
0
The length of insulation scheduled time t in described heat treatment step can change into pearlite and/or the required time of lower bainite decides from austenite fully according to the material of mother metal 10.
Be understood that easily, when carrying out described heat treatment step, utilize temperature to begin transition temperature T for the lower bainite of mother metal 10
0Heat-treatment medium Welded Joints 11 heat-treat, the concrete composition of described heat-treatment medium will specifically describe hereinafter, repeat no more here.
If in described heat treatment step, the cooling velocity v of the material at welding point 11 places is cooled to the minimum cooling velocity that begins perlitic transformation less than mother metal 10 from welding temperature, and the tissue at welding point 11 places all is pearlitic structrure so.Pearlitic structrure has preferably toughness, is not easy to crack.
Preferably, in described heat treatment step, the cooling velocity v of the material at welding point 11 places is cooled to the minimum cooling velocity that begins perlitic transformation greater than mother metal 10 from welding temperature, so that the material at welding point 11 places has part lower bainite tissue at least.
The lower bainite tissue has higher-strength and toughness preferably, and welding point 11 places exist the lower bainite tissue can improve simultaneously intensity and the toughness of welding point 11.
The lower bainite that obtains in the material at the larger then weldment of material cooled speed v joint 11 places at welding point 11 places is organized more, and the intensity of welding point 11 is higher.
In order to make welding point 11 places obtain lower bainite tissue as much as possible, preferably in heat treatment step, the cooling velocity v of the material at welding point 11 places is greater than the critical cooling rate of mother metal 10, so that the material at welding point 11 places all has the lower bainite tissue.One skilled in the art will appreciate that so-called " critical cooling rate " material required minimum cooling velocity when when cooling, structural transformation was complete martensitic structure.The material at welding point 11 places can make this place obtain more bainite structure tissue to cool off greater than critical cooling rate, makes welding point 11 have higher intensity and toughness preferably concurrently.
When mother metal 10 was high-strength steel, critical cooling rate was approximately 138.5 ℃/s, and therefore in described heat treatment step, the cooling velocity v the during material at cooling welding joint 11 places can be greater than 138.5 ℃/s.One skilled in the art will appreciate that described " high-strength steel " refers to that yield strength is greater than the ferrous materials of 345MPa.
As indicated above, the length of the insulation scheduled time t in described heat treatment step can change into pearlite and/or the required time of lower bainite decides from austenite fully according to the material of mother metal 10.Temperature retention time is longer, and then the structural transformation of the material at welding point 11 places is more complete.Preferably, scheduled time t can be 10s to 50s.When welding point 11 was incubated 10s to 50s in described heat treatment step after, the material at welding point 11 places can change pearlitic structrure or lower bainite tissue into fully from austenite structure.
As another aspect of the present invention, as shown in Fig. 1 to Fig. 7, a kind of annealing device 100 also is provided, wherein, this annealing device 100 is used for implementing the heat treatment step of above-mentioned welding method provided by the present invention, annealing device 100 comprises the hot processing chamber 110 with opening 110a, and the heat-treatment medium in this hot processing chamber 110 can directly contact from opening 110a outflow and with welding point 11, and the temperature of heat-treatment medium is that the lower bainite of mother metal 10 begins transition temperature T
0
When carrying out described welding method, annealing device 100 is arranged on welding gun 200 rears of carrying out described welding step, and with welding gun 200 synchronizing movings.
As shown in Fig. 1 and Fig. 3, when carrying out described heat treatment step, welding point 11 is exposed in the hot processing chamber 110, and the heat-treatment medium in the Re Chu chamber 110 contacts, with the material at welding point 11 places from predetermined temperature T
1Be reduced to lower bainite and begin transition temperature T
0
In the present invention, the length (along the length of moving direction) of the hot processing chamber 110 by the control translational speed of annealing device 100 and described annealing device 100 can be controlled the described scheduled time t of the insulation in the described heat treatment step.The translational speed of the length/annealing device 100 of scheduled time t=hot processing chamber 110.Therefore, value that can be by scheduled time t and the translational speed of annealing device 100 are determined the length of hot processing chamber 110.
In the present invention, annealing device 100 can be linked to each other with the container that holds heat-treatment medium, the heat-treatment medium in the described container be introduced in the hot processing chamber 110 getting final product by equipment such as suction pumps.In order to save heat-treatment medium, be convenient to heat-treatment medium is sent in the hot processing chamber 110, preferably, annealing device 100 can also comprise heat exchange chamber 120, this heat exchange chamber 120 optionally is communicated with hot processing chamber 110, and heat-treatment medium is heated or cooled in heat exchange chamber 120 to lower bainite and begins transition temperature T
0After send into hot processing chamber 110.
Before carrying out described heat treatment step, heat-treatment medium is stored in the heat exchange chamber 120, the lower bainite that then heat-treatment medium is heated to mother metal 10 begins transition temperature T
0, when described heat treatment step begins, the heat-treatment medium in the heat exchange chamber 120 is passed in the hot processing chamber 110.Behind the insulation scheduled time t, the heat-treatment medium temperature raises, and can be recycled to the heat-treatment mediums in the hot processing chamber 110 in the heat exchange chamber 120 this moment, and the lower bainite that is cooled to mother metal 10 in heat exchange chamber 120 begins transition temperature T
0
For the ease of the heat-treatment medium in the hot processing chamber 110 is recycled, preferably, annealing device 100 can also comprise medium recovery device, and medium recovery device is used for sending the described heat-treatment medium of hot processing chamber 110 back to heat exchange chamber 120.
Hereinafter will introduce in detail the structure of the annealing device 100 shown in Fig. 2 and Fig. 3.As shown in FIG., annealing device 100 can comprise the open housing in lower end 130 and hold the bath salt pond 140 of heat-treatment medium, this bath salt pond 140 is arranged in the inner space of housing 130, the part that is positioned at 140 belows, bath salt pond in the housing 130 forms hot processing chamber 110, heat-treatment medium has the first gap 150 between the sidewall in bath salt pond 140 and the housing 130, so that can arrive hot processing chamber 110 by the first gap 150.
In order to realize " optionally being communicated with " between hot processing chamber 110 and the heat exchange chamber 120, as shown in Figure 5, preferably, can be at the first gap 150 interior switch valves 151 that arrange.Heat treatments in the heat exchange chamber 120 heating or the lower bainite that is cooled to mother metal are begun transition temperature T
0After, switch valve 151 is opened, heat-treatment medium is flow in the hot processing chamber 110 by the first gap 150.
Further preferably, can also be in the first gap 150 interior filter element (such as, filter screen etc.) be set, thereby preventing that impurity in the heat-treatment medium from entering stops up this first gap 150 in the first gap 150.
For the ease of the heat-treatment medium in the hot processing chamber 110 is reclaimed, preferably, described medium recovery device can comprise suction pump 160 and the carrier pipe 141 that is arranged in the bath salt pond 140, the lower end of this carrier pipe 141 communicates with hot processing chamber 110, suction pump 160 is arranged in the carrier pipe 141, so that the heat-treatment medium in the hot processing chamber 110 is recycled in the bath salt pond 140.
In order to prevent that the liquid in the carrier pipe 141 from flowing back to hot processing chamber again, as shown in Fig. 3 and Fig. 7, preferably, described medium recovery device can also comprise the check valve 142 that is arranged in the carrier pipe 141, this check valve 142 is positioned at the below of suction pump 160, only allows heat-treatment medium to flow to the top of this check valve 142 from the below of this check valve 142.When suction pump 160 work, heat-treatment medium can upwards flow by check valve, and when suction pump 160 quit work, the fluid in the carrier pipe 141 can not flow back in the hot processing chamber 110 again by check valve 142.
Because annealing device 100 is mobile simultaneously with welding gun 200, therefore, for the ease of with hot processing chamber 110, preferably, medium recovery device also comprises sleeve 170 and gas source, and sleeve 170 is enclosed within housing 130 outsides, and the top of sleeve 170 and housing 130 are tightly connected, the below of sleeve 170 is open, and the lower limb of sleeve 170 surpasses the lower limb of housing 130, and the gas that gas source produces passes into the second gap 171 between sleeve 170 and the housing 130.Be understood that easily, the second gap 171 is around housing 130, gas blows to the heat-treatment medium in the hot processing chamber 110 in the outside of hot processing chamber 110 center of hot processing chamber 110, thereby be convenient to suction pump 160 heat-treatment medium is pumped in the carrier pipe 141, and sends back in the heat exchange chamber 120.
When carrying out welding method of the present invention, the lower limb of sleeve 170 can contact with mother metal 10, thereby can better heat-treatment medium be reclaimed.Certainly, the lower limb of sleeve 170 also can and mother metal 10 between keep certain gap, to prevent wearing and tearing sleeve 170 in welding process.Preferably, the lower limb of sleeve 170 and the gap between the mother metal can be less than 5mm, thereby can either guarantee that the gas that gas source produces can blow heat-treatment medium to the center of hot processing chamber 110, can guarantee that also sleeve 170 is not worn.
As shown in Figure 3, the gas of gas source generation passes in the second gap 171 by pipeline.Can switch valve be set at described pipeline, can control the flow velocity that passes into the gas in the second gap 171 by the aperture of adjustment switch valve and the air pressure of gas source.
In the present invention, the gas that gas source provides can be air, inert gas etc., and is oxidized in order to prevent welding point, and reduce cost, and preferably, gas source is set to provide carbon dioxide.
Temperature for the ease of control bath salt pond 140 interior heat-treatment mediums preferably, can be provided with heater 143 and cooling device 144 in bath salt pond 140.Before carrying out described heat treatment step, utilize heater 143 that the lower bainite that described heat-treatment medium is heated to mother metal 10 is begun transition temperature T
0, after medium recovery device is recycled to heat-treatment medium in the heat exchange chamber 120, can begin transition temperature T with the lower bainite that cooling device 144 is down to mother metal 10 with the temperature of heat-treatment medium from hot processing chamber 110
0For the ease of observing the temperature of the heat-treatment medium in the hot processing chamber 110, preferably, as shown in Figure 4, can be in heat exchange chamber 120 set temperature meter 146.In the present invention, heater 143 can comprise resistance wire, and cooling device 144 can comprise water cooling tube.
For the ease of the temperature of control heat-treatment medium, preferably, can be in the bath salt pond 140 interior set temperature sensors 145.This temperature sensor 145 and heater 143 and cooling device 144 are electrically connected.Should be understood that described annealing device also comprises the controller that is electrically connected with temperature sensor 145, this controller is electrically connected with described heater 143 and cooling device 144.When the lower bainite that the temperature that detects heat-treatment medium when temperature sensor 145 is higher or lower than mother metal 10 begins transition temperature T0, temperature signal is passed to controller, controller is according to concrete temperature value control open cold radiator cooler 144 or heater 143, heat-treatment medium is cooled off or heat.
For the ease of described heat-treatment medium is delivered to hot processing chamber, preferably, described annealing device 100 can also comprise medium feeding apparatus, and this medium feeding apparatus begins transition temperature T for the lower bainite that heat exchange chamber 120 is heated to mother metal 10
0Heat-treatment medium be delivered to hot processing chamber 110.Usually, medium feeding apparatus also can comprise suction pump.
In the present invention, described heat-treatment medium should have good cooling capacity.And can control the cooling velocity of described heat treatment step by the composition of control heat-treatment medium.In the present invention, because described predetermined temperature T
1Higher (be lower than in the described welding step welding temperature 50 to 100 ℃), described heat-treatment medium at high temperature should be more stable, can not decompose.Preferably, the composition of described heat-treatment medium can comprise KOH, NaOH and H
2O.KOH and NaOH are ionic crystals, generate the lower mixture of fusing point after mixing.And KOH and NaOH have good water-soluble, and stable chemical nature, are in for a long time under the hot environment and can decompose, and can not produce toxic gas.H in the heat-treatment medium
2O can strengthen cooling capacity and the flowability of this heat-treatment medium, is convenient to described heat-treatment medium is reclaimed rear utilization.
In order to increase the flowability of described heat-treatment medium, be convenient to recycle, preferably, the composition of described heat-treatment medium can also comprise NaNO
2
When the gas that provides when described gas source was carbon dioxide, preferably, the composition of described heat-treatment medium also comprised Na
2CO
3, react with carbon dioxide to prevent the alkaline bath salt (KOH, NaOH) in the described heat-treatment medium.That is, can prevent KOH and H
2O, CO
2Reaction generates KHCO
3, perhaps prevent KOH and CO
2Reaction generates K
2CO
3, and can prevent NaOH and H
2O, CO
2Reaction generates NaHCO
3, perhaps can prevent NaOH and CO
2Reaction generates Na
2CO
3
In order to make described heat-treatment medium have optimum cooling performance and flowability, preferably, in described heat-treatment medium, the weight ratio of KOH is 35-40%, and the weight ratio of NaOH is 40-45%, NaNO
2Weight ratio be 5-10%, Na
2CO
3Weight ratio be 5-8%, H
2The weight ratio of O is 10-13%.Operating temperature with described heat-treatment medium of mentioned component is 160 ℃ to 350 ℃.
As another aspect of the present invention, a kind of welding system also is provided, wherein, this welding system is used for implementing above-mentioned welding method provided by the present invention, described welding system comprises be used to the welding gun 200 of implementing described welding step with for the annealing device 100 of implementing described heat treatment step, this annealing device 100 and the welding gun 200 that carries out welding step are along the welding direction synchronizing moving, and annealing device 100 is above-mentioned annealing device provided by the present invention.
Preferably, the distance between the center of an end of the close welding gun 200 of hot processing chamber 110 and welding gun 200 is 30-50mm.In this case, the temperature of the welding point of the front end of hot processing chamber 110 is lower about 50 to 100 ℃ than welding temperature.
In when welding, welding point is cooled to bainite begins transition temperature so that the welding point place can not produce martensitic structure, thereby reduces the cold crack sensitiveness at welding point place, improved the mechanical property of joint.
Below describe by reference to the accompanying drawings preferred embodiment of the present invention in detail; but; the present invention is not limited to the detail in the above-mentioned embodiment; in technical conceive scope of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
Need to prove that in addition each the concrete technical characterictic described in the above-mentioned specific embodiment in reconcilable situation, can make up by any suitable mode.For fear of unnecessary repetition, the present invention is to the no longer separately explanation of various possible combinations.
In addition, also can carry out any combination between the various embodiment of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (23)
1. welding method is characterized in that the method comprises:
Welding step: mother metal (10) is welded together, and form welding point (11);
Heat treatment step: make material that described welding point (11) locates from predetermined temperature (T
1) lower bainite that is cooled to described mother metal (10) begins transition temperature (T
0), the temperature of the material that described welding point (11) is located remains on described lower bainite and begins transition temperature (T
0), temperature retention time is the scheduled time (t).
2. welding method according to claim 1, it is characterized in that, in described heat treatment step, the cooling velocity of the material that described welding point (11) is located (v) is cooled to the minimum cooling velocity that begins perlitic transformation greater than described mother metal (10) from welding temperature, so that the material that institute's welding point (11) is located has part lower bainite tissue at least.
3. welding method according to claim 2, it is characterized in that, in described heat treatment step, the cooling velocity of the material that described welding point (11) is located is (v) greater than the critical cooling rate of described mother metal (10), so that the material that described welding point (11) is located all has the lower bainite tissue.
4. welding method according to claim 3 is characterized in that, described mother metal (10) is high-strength steel.
5. the described welding method of any one in 4 according to claim 1 is characterized in that the described scheduled time (t) is 10s to 50s.
6. annealing device, it is characterized in that, this annealing device is used for the described heat treatment step in the described welding method of enforcement claim 1 to 5 any one, described annealing device comprises the have opening hot processing chamber (110) of (110a), heat-treatment medium in this hot processing chamber (110) can contact from described opening (110a) outflow and with described welding point (11), and the temperature of described heat-treatment medium is that the lower bainite of described mother metal (10) begins transition temperature (T
0).
7. annealing device according to claim 6, it is characterized in that, this annealing device also comprises heat exchange chamber (120), this heat exchange chamber (120) optionally is communicated with described hot processing chamber (110), and described heat-treatment medium is heated or cooled in described heat exchange chamber (120) to described lower bainite and begins transition temperature (T
0) after send into described hot processing chamber (110).
8. annealing device according to claim 7 is characterized in that, this annealing device also comprises medium recovery device, and described medium recovery device is used for sending the heat-treatment medium of described hot processing chamber (110) back to described heat exchange chamber (120).
9. annealing device according to claim 8, it is characterized in that, this annealing device comprises the housing (130) that the lower end is open and holds the bath salt pond (140) of described heat-treatment medium, this bath salt pond (140) is arranged in the inner space of described housing (130), the part that is positioned at below, described bath salt pond (140) in the described housing (130) forms described hot processing chamber (110), described heat-treatment medium has the first gap (150) between the sidewall in described bath salt pond (140) and the described housing (130), so that can arrive described hot processing chamber (110) by described the first gap (150).
10. annealing device according to claim 9 is characterized in that, is provided with switch valve (151) and/or filter element in described the first gap (150).
11. annealing device according to claim 9, it is characterized in that, described medium recovery device comprises suction pump (160) and is arranged on the interior carrier pipe (141) in described bath salt pond (140), the lower end of this carrier pipe (141) communicates with described hot processing chamber (110), described suction pump (160) is arranged in the described carrier pipe (141), so that the heat-treatment medium in the described hot processing chamber (110) is recycled in the described bath salt pond (140).
12. annealing device according to claim 11, it is characterized in that, described medium recovery device also comprises the check valve (142) that is arranged in the described carrier pipe (141), this check valve (142) is positioned at the below of described suction pump (160), only allows described heat-treatment medium to flow to the top of this check valve (142) from the below of this check valve (142).
13. annealing device according to claim 11, it is characterized in that, described medium recovery device also comprises sleeve (170) and gas source, described sleeve (170) is enclosed within described housing (130) outside, and the top of described sleeve (170) and described housing (130) are tightly connected, the below of described sleeve (170) is open, the lower limb of described sleeve (170) surpasses the lower limb of described housing (130), and the gas that described gas source produces passes into the second gap (171) between described sleeve (170) and the described housing (130).
14. annealing device according to claim 13 is characterized in that, described gas source can provide carbon dioxide.
15. annealing device according to claim 9 is characterized in that, is provided with heater (143) and cooling device (144) in the described bath salt pond (140).
16. annealing device according to claim 15 is characterized in that, is provided with temperature sensor (145) in the described bath salt pond (140), this temperature sensor (145) is electrically connected with described heater (143) and described cooling device (144).
17. annealing device according to claim 8 is characterized in that, this annealing device also comprises medium feeding apparatus, and this medium feeding apparatus is used for the heat-treatment medium of described heat exchange chamber is delivered to described hot processing chamber.
18. the described annealing device of any one in 17 is characterized in that the composition of described heat-treatment medium comprises KOH, NaOH and H according to claim 6
2O.
19. annealing device according to claim 18 is characterized in that, the composition of described heat-treatment medium also comprises NaNO
2
20. annealing device according to claim 19 is characterized in that, the composition of described heat-treatment medium also comprises Na
2CO
3
21. annealing device according to claim 20 is characterized in that, in described heat-treatment medium, the weight ratio of KOH is 35-40%, and the weight ratio of NaOH is 40-45%, NaNO
2Weight ratio be 5-10%, Na
2CO
3Weight ratio be 5-8%, H
2The weight ratio of O is 10-13%.
22. welding system, it is characterized in that, this welding system is used for implementing the described welding method of claim 1 to 5 any one, described welding system comprises be used to the welding gun of implementing described welding step (200) with for the annealing device (100) of implementing described heat treatment step, this annealing device (100) and the welding gun (200) that carries out described welding step are along the welding direction synchronizing moving, and described annealing device is the described annealing device of any one in the claim 6 to 21.
23. welding system according to claim 22 is characterized in that, the distance between an end of the close described welding gun (200) of described hot processing chamber (110) and the center of this welding gun (200) is 30-50mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210499248.8A CN103028851B (en) | 2012-11-29 | 2012-11-29 | Thermal treatment device and welding system |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS517628B2 (en) * | 1972-09-14 | 1976-03-09 | ||
| JPS53118242A (en) * | 1977-03-25 | 1978-10-16 | Hitachi Ltd | Method of manufacturing welding structure |
| CN1050409A (en) * | 1990-11-03 | 1991-04-03 | 机械电子工业部哈尔滨焊接研究所 | Friction welding joint deformation heat treatment method and device |
| CN2613488Y (en) * | 2003-03-20 | 2004-04-28 | 东风汽车公司 | Intenral heating-cooling nitrate quenching furnace |
| CN101622365A (en) * | 2007-01-17 | 2010-01-06 | Kva公司 | Use postweld heat treatment to improve the method for a seam welding performance |
-
2012
- 2012-11-29 CN CN201210499248.8A patent/CN103028851B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS517628B2 (en) * | 1972-09-14 | 1976-03-09 | ||
| JPS53118242A (en) * | 1977-03-25 | 1978-10-16 | Hitachi Ltd | Method of manufacturing welding structure |
| CN1050409A (en) * | 1990-11-03 | 1991-04-03 | 机械电子工业部哈尔滨焊接研究所 | Friction welding joint deformation heat treatment method and device |
| CN2613488Y (en) * | 2003-03-20 | 2004-04-28 | 东风汽车公司 | Intenral heating-cooling nitrate quenching furnace |
| CN101622365A (en) * | 2007-01-17 | 2010-01-06 | Kva公司 | Use postweld heat treatment to improve the method for a seam welding performance |
Non-Patent Citations (3)
| Title |
|---|
| 中国机械工程学会焊接学会: "《焊接手册第3版第1卷：焊接方法及设备》", 30 January 2008, article "材料摩擦焊的焊接性" * |
| 余洪波: "工具钢热处理盐浴综述", 《电子工艺技术》, vol. 25, no. 3, 30 May 2004 (2004-05-30) * |
| 崔忠圻: "《金属学与热处理原理》", 30 September 1998, article "贝氏体转变" * |
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