CN102380688A - Method and device for controlling welding hot cracking during welding by performing electromagnetic induction heating - Google Patents
Method and device for controlling welding hot cracking during welding by performing electromagnetic induction heating Download PDFInfo
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- CN102380688A CN102380688A CN2010102699879A CN201010269987A CN102380688A CN 102380688 A CN102380688 A CN 102380688A CN 2010102699879 A CN2010102699879 A CN 2010102699879A CN 201010269987 A CN201010269987 A CN 201010269987A CN 102380688 A CN102380688 A CN 102380688A
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Abstract
The invention relates to a method and device for controlling welding hot cracking during welding by performing electromagnetic induction heating. A preheating coil for preheating a workpiece to be welded is arranged in front of a welding gun; an after heating coil for heating a quickly-cooled welding seam for realizing slow cooling is arranged behind the welding gun; and the center of the after heating coil is positioned between positions which are in the center of a welding pool for the workpiece to be welded and are L1 and L2 distances away from corresponding positions of the upper limit temperature T1 and lower limit temperature T2 of the brittleness temperature rang TB of a welding material. In the invention, preheating before welding and slow cooling after welding are realized, so that the strain rate of the welding seam in the brittleness temperature rang is reduced, and welding hot cracking is controlled effectively on the aspects of metallurgy and mechanics; and moreover, the device has a simple structure, high production efficiency and low cost, is easy to realize, and contributes to energy saving and environmental protection.
Description
Technical field
The present invention relates to a kind of method and apparatus that when welding, is used to control HOT CRACK FOR WELDING P, particularly a kind of method and apparatus that adopts electromagnetic-induction heating method control HOT CRACK FOR WELDING P belongs to welding technology field.
Background technology
HOT CRACK FOR WELDING P is the FAQs of the existence in the welding process, is the main shortcoming of welded unit.HOT CRACK FOR WELDING P mainly is meant in the welding process, and the crackle that weld seam and heat affected area metal are produced when being cooled near the high-temperature region the solidus is wherein common with solidification cracking.Solidification cracking only is present on the weld seam, and one is and vertically is distributed in axis of a weld, or the curved center line both sides that are distributed in, and these crackles all are that the crystal boundary along primary crystallization distributes, column crystal especially, and solidification cracking mainly is to be caused by coring.
In order to prevent and treat HOT CRACK FOR WELDING P, one can be set about from metallurgy factor aspect and mechanics factor aspect.From the metallurgy factor aspect, mainly through adjusting the weld seam alloy system or in metal, adding alterant, this method cycle is longer, and cost is high.Controlling from the mechanics factor aspect, mainly is the purpose that stress state when improving welding reaches the control HOT CRACK FOR WELDING P.Suitably increase weld heat input and improve the hot cracking tendency that preheat temperature can both reduce weld metal, but increasing weld heat input can make the metal in nearly seam district overheated, improve preheat temperature and can worsen working condition again.
In addition, for addressing this problem, adopt the method for some other control HOT CRACK FOR WELDING P both at home and abroad in addition, like static and dynamic temperature difference pulling method, with weldering rolled-on method, weld with trailing impactive rolling method etc., but also all there is shortcoming separately in this several method.Like static thermal tension method, for reaching the required temperature difference, need long heat time heating time, cause the softening of thermal treatment zone metal easily, production efficiency is low, and production cost is high.The dynamic temperature difference pulling method if the water spray cooling can be polluted welding pool, causes the weld seam shortcoming, influences quality of weld joint, and with the flexible contact cooling of liquid nitrogen, then causes cost too high.With the weldering rolled-on method, complex equipments, manufacturing cost is high, and is relatively stricter to the welded part shape need, and rolling wheel interferes generation to beat the arc phenomenon with welding gun easily.The weld with trailing impactive rolling method only is applicable to plate sheet welding, and energy can't accurately control, and along with the variation of welding conditions and welding material, the size of impacting roll milling wheel need design and prepare again.
Summary of the invention
Main purpose of the present invention is to address the above problem and is not enough, provides a kind of and can effectively control HOT CRACK FOR WELDING P, increases substantially production efficiency, and realization reduces cost, the method with weldering electromagnetic induction heating control HOT CRACK FOR WELDING P of energy-conserving and environment-protective purpose.
Another object of the present invention is, provide a kind of simple in structure, production efficiency is high, cost is low, the device with weldering electromagnetic induction heating control HOT CRACK FOR WELDING P of energy-conserving and environment-protective.
For realizing above-mentioned purpose, technical scheme of the present invention is:
A kind of method with weldering electromagnetic induction heating control HOT CRACK FOR WELDING P is before welding, at first confirms the brittle temperature range T of workpiece to be welded
B, simultaneously, confirm brittle temperature range T
BCeiling temperature T1 and lower limit temperature T2 correspondence position apart from the distance L of the welding pool central authorities of workpiece to be welded
1And L
2In the place ahead of welding gun one preheating coil is set, a back heat coil is set at the rear of welding gun, said welding gun, preheating coil and back heat coil all be arranged on weld seam directly over the position, wherein make the preheating coil be positioned at solder joint; In the welding process, the weld seam that said preheating coil is at first treated welding work pieces carries out preheating, and when welding gun moved to the welding starting point, the electric arc that ignites began welding, simultaneously, detected the temperature of weld seam, when weld seam temperature is in brittle temperature range T
BIn the time of in the scope, move the back heat coil to said distance L
1To L
2Between scope in, the weld seam that is cooling off is heated the realization slow cooling, accomplish until whole welding.
Wherein, confirm the welding pool central authorities of workpiece to be welded and the distance L between brittle temperature range ceiling temperature T1 and lower limit temperature T2
1And L
2Method; Be before welding; Get a testpieces that can reflect actual workpiece temperature to be welded field; Under actual welding technology,, measure the field of welding temperature of this testpieces, the distance L on the confirmed test part between welding pool central authorities and brittle temperature range ceiling temperature T1 and lower limit temperature T2 to this testpieces welding
1And L
2Thereby, confirm the welding pool central authorities of workpiece to be welded and the distance L between brittle temperature range ceiling temperature T1 and lower limit temperature T2
1And L
2
A kind of device that adopts said method; Comprise welding gun; In the place ahead of said welding gun one preheating coil is set, a back heat coil is set at the rear of said welding gun, said welding gun, preheating coil and back heat coil all be arranged on weld seam directly over the position; On said welding gun, preheating coil and back heat coil, be fixedly connected a running mechanism respectively; Said running mechanism is controlled by manipulator, and said preheating coil and back heat coil are connected with the respective coil firing equipment respectively, on the heat coil of said back, a temperature sensor is set again; Said temperature sensor is connected with the input of controller, and the output of said controller is connected with the firing equipment of said manipulator and back heat coil.
Said coil heats equipment is formed by induction coil heating apparatus and for this heater provides water-cooled water-circulating cooling device.
Said preheating coil and back heat coil are processed by the red copper material.
The centre distance of the center of said preheating coil to said welding gun electric arc is 25mm to 60mm.
The welding pool central authorities and this welding material brittle temperature range T that are centered close to workpiece to be welded of said back heat coil
BDistance L between ceiling temperature T1 and lower limit temperature T2 correspondence position
1And L
2Between.
Distance between the lower surface distance upper surface of workpiece to be welded of said preheating coil and back heat coil is 1-5mm.
The diameter of said preheating coil and back heat coil is 30-50mm.
Content to sum up; Method and apparatus with weldering electromagnetic induction heating control HOT CRACK FOR WELDING P of the present invention can be realized preheating in welding process, not only can not worsen condition of work; Can also use less current to weld, reduce welding hot crack tendency.Simultaneously, avoided improving weld heat input for preventing and treating HOT CRACK FOR WELDING P, it is overheated that nearly seam district is organized, and reduce nearly seam district organization mechanics performance.In addition, the present invention also carries out slow cooling to the weld seam that is cooling off in welding process, reduces the strain rate of weld seam in brittle temperature range, thereby has satisfied the mechanical condition of control HOT CRACK FOR WELDING P.
The present invention is owing to carry out preheating and slow cooling in welding process; Can accurately control induction heating power; Can accurately control preheat temperature and postheat temperature for material different; Whole or the local thermograde of welding work pieces is reduced, be of value to and prevent generation thick, the tangible column crystal of crystallization direction, controlled the generation of HOT CRACK FOR WELDING P from metallurgical and two aspects of mechanics effectively.
This apparatus structure is simple, is easy to realize that coil and surface of the work noncontact can not polluted weld seam, do not influence the surface quality of weld seam, also can increase substantially production efficiency, reduce cost.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is weld seam of the present invention and coil relative position sketch map;
Fig. 3 is cooling curve of the present invention and conventional weldering cooling curve comparison diagram;
Fig. 4 is a field of welding temperature sketch map of the present invention.
Extremely shown in Figure 4 like Fig. 1, workpiece 1 to be welded, welding gun 2, preheating coil 3, back heat coil 4; Running mechanism 5,6,7, manipulator 8, coil heats equipment 9,10, temperature sensor 11, controller 12; Induction coil heating apparatus 13, water-circulating cooling device 14, welding job platform 15, the source of welding current 16.
The specific embodiment
Below in conjunction with the accompanying drawing and the specific embodiment the present invention is described in further detail:
As shown in Figure 1; A kind of device with weldering electromagnetic induction heating control HOT CRACK FOR WELDING P comprises welding gun 2, and a preheating coil 3 is set in the place ahead of welding gun 2; One back heat coil 4 is set at the rear of welding gun 2; Welding gun 2, preheating coil 3 and back heat coil 4 all be arranged on weld seam directly over the position, vertically arrange setting along axis of a weld, welding gun 2 connects a source of welding current 16.In the welding process; The weld seam that preheating coil 3 is at first treated welding work pieces 1 carries out preheating, and 4 pairs of weld seams that cooling off of back heat coil are heated and reached the purpose of slow cooling, accomplishes until whole welding; This welding manner; Whole or the local thermograde of welding work pieces is reduced, be of value to and prevent generation thick, the tangible column crystal of crystallization direction, can effectively control the generation of HOT CRACK FOR WELDING P from metallurgical and two aspects of mechanics.
On welding gun 2, be fixedly connected a running mechanism 5; On preheating coil 3, be fixedly connected a running mechanism 6; Also be fixedly connected 7, three running mechanisms of a running mechanism 5,6,7 in the back on the heat coil 4 and control the moving direction and the displacement of manipulator 8 control running mechanisms 5,6,7 by manipulator 8; After moving into place, also play a part fixing simultaneously.Walking mechanism 5,6 and 7 is walked on the guide rail of manipulator 8 cantilevers through the drive of motor; Walking mechanism 5,6 can be fixedly connected through the adjustable metal ring clamper (not shown) of the diameter on the running mechanism 5,6,7 with welding gun 2, preheating coil 3 and back with 7 being connected of heat coil 4, and the internal diameter of metal ring clamper can be adjusted according to welding gun 2 and the preheating coil 3 and the diameter of back heat coil 4 copper cash pipes.But manipulator 8 computer controlled automatic also can adopt the mode of manual control, and this control mode is a known technology, does detailed description here no longer in addition.
Preheating coil 3 is furnished with a cover coil heats equipment 9; Back heat coil 4 is also corresponding is furnished with a cover coil heats equipment 10; Coil heats equipment 9,10 is controlled eddy-current heating frequency, heating-up temperature and the heat time heating time etc. of preheating coil 3 and back heat coil 4 respectively, and coil heats equipment 9,10 is formed by induction coil heating apparatus 13 and for this heater 13 provides water-cooled water-circulating cooling device 14.Like this, can be according to the character of material to be welded, the temperature of needs preheating, the brittle temperature range T of welding material
B, parameter such as speed of welding v; With the exacting terms that is prone to most HOT CRACK FOR WELDING P be as the criterion calculate definite; Thereby accurately control eddy-current heating frequency, heating-up temperature and the heat time heating time etc. of preheating coil 3 and back heat coil 4; Enhance productivity, can effectively control the generation of HOT CRACK FOR WELDING P simultaneously.Be used to control the induction coil heating apparatus 13 of preheating coil 3 and back heat coil 4, can be divided into several grades of settings,, can simplify technology, easy operating based on different welding condition stepping control.
For detecting the temperature of weld seam, on the heat coil 4 of back, a temperature sensor 11 is set again, temperature sensor 11 is connected with the input of controller 12, and the output of controller 12 is connected with manipulator 8, also is connected with the firing equipment 10 of back heat coil 4 simultaneously.Temperature sensor 11 is passed to controller 12 with detected temperature signal, stores the brittle temperature range T of material to be welded in the controller 12 in advance
BRelevant parameter, be in brittle temperature range T when temperature sensor 11 detects weld seam temperature
BWhen interior, with signal feedback to controller 12, controller 12 is received signal, sends instruction for manipulator 8, and manipulator 8 moves to back heat coil 4 through running mechanism 7 the brittle temperature range T of welding material
BCeiling temperature T1 and the scope between the lower limit temperature T2 correspondence position in, just as shown in Figure 4, back heat coil 4 is positioned at L
1To L
2Between scope in, be used for carrying out slow cooling to the heating of the weld seam of fast cooling, reduce weld seam at brittle temperature range T
BInterior strain rate, thus satisfy the mechanical condition of controlling HOT CRACK FOR WELDING P.
As shown in Figure 4, the field of welding temperature of expression welding material, one gets oval Gaussian distribution for the thermal source that moves, and wherein, T1 represents the brittle temperature range T of material to be welded
BCeiling temperature, T2 represents the lower limit temperature of the brittle temperature range of material to be welded, L
1Represent brittle temperature range T
BCeiling temperature T1 correspondence position is apart from the distance of the welding pool central authorities of workpiece 1 to be welded, L
2Represent brittle temperature range T
BLower limit temperature T2 correspondence position is apart from the distance of the welding pool central authorities of workpiece 1 to be welded.Different welding materials, its brittle temperature range T
BBe different, according to the difference of material thickness to be welded, the welding pool of workpiece 1 to be welded central authorities and brittle temperature range T
BDistance L between ceiling temperature T1 and lower limit temperature T2
1And L
2Also different.Welding material is thick more, and the material heat dispersion is good more, L
1Numerical value is just more little, and the heating frequency of back heat coil 4 that is used for slow cooling is just higher relatively, and heating-up temperature and heat time heating time are also longer, and back heat coil 4 is also nearer apart from the distance of welding gun 2.Material to be welded is thin more, and the heat rating influence is bigger, L
1Numerical value is just big more, and the heating frequency of back heat coil 4 that is used for slow cooling is just on the low side relatively, and heating-up temperature and heat time heating time are also shorter, and back heat coil 4 is also far away apart from the distance of welding gun 2.So this device can be suitable for the metal of the various materials of welding, all thickness, as long as accurately confirm L before the welding
1And L
2Two numerical value just can effectively be controlled the generation of HOT CRACK FOR WELDING P.
Preheating coil 3 and back heat coil 4 are processed by copper tube, because red copper resistance is low little to the loss of electric energy, logical recirculated water cools off in the copper tube, outsidely twine with insulating materials such as enamel-covered wire etc.
As shown in Figure 2, one is chosen in the diameter of preheating coil 3 and back heat coil 4 in the 30-50mm scope.
Preheating coil 3 is good more closely more with the distance of welding gun 2, can use less current to weld like this, and can accurately control the induction heating power of preheating coil 3; Simultaneously, can corresponding reduction induction heating power, energy-conserving and environment-protective; But arc temperature is higher during owing to welding, and preheating coil 3 is near excessively apart from electric arc, and preheating coil 3 is burnt; Under one situation, guarantee more than the edge 10mm of Edge Distance welding gun 1 electric arc of preheating coil 3.Be to guarantee welding quality, the centre distance of the center of preheating coil 3 to welding gun 1 electric arc at least will be more than 25mm, but also is difficult for surpassing 60mm, can select the arbitrary value in this scope according to parameters such as welding material, welding temperature, speeds of welding.
Preheating coil 3 and back heat coil 4 directly do not contact with workpiece 1 to be welded, can not pollute weld seam, also just can not influence the surface quality of weld seam.Distance h 1 between the lower surface distance upper surface of workpiece 1 to be welded of preheating coil 3 and back heat coil 4 is respectively 1-5mm with h2; In order to improve preheating and slow cooling effect; This distance is good more closely more, so h1 and h2 are preferably 1-2mm, the numerical value of h1 and h2 can be identical; Also can be different, this need control respectively according to parameters such as welding material, field of welding temperature, speeds of welding.
As shown in Figure 3, T among the figure
LThe line liquidus curve, T
SThe line solidus, T
BBe brittle temperature range; Curve I is the eddy-current heating cooling curve among the figure, and curve II is conventional weldering cooling curve, and curve III is not for producing the critical cooling curve of HOT CRACK FOR WELDING P; The curve cooling velocity can not crack less than curve III, and the curve cooling velocity will crack greater than curve III.From Fig. 3, can obviously find out, adopt welding method of the present invention after, thermograde reduces and is out of shape lessly in its welding process, also just the generation of HOT CRACK FOR WELDING P can be effectively controlled in representative.
Below welding method of the present invention and step are described in detail.
1, before welding, at first confirms the brittle temperature range T of material to be welded
B
2, as shown in Figure 4, confirm the field of welding temperature of workpiece 1 to be welded.
The method of confirming field of welding temperature is; Get a testpieces that can reflect actual workpiece to be welded 1 temperature field; Under actual welding technology,, measure the field of welding temperature of this testpieces, welding pool central authorities and brittle temperature range T on the confirmed test part to this testpieces welding
BDistance L between ceiling temperature T1 and lower limit temperature T2
1And L
2Thereby, the welding pool central authorities and the brittle temperature range T of definite workpiece to be welded
BDistance L between ceiling temperature T1 and lower limit temperature T2
1And L
2
3, with the brittle temperature range T of material to be welded
BStore in advance in the controller 12, distance L
1And L
2Numerical value store in advance to manipulator 8.
4, be as the criterion with the exacting terms that is prone to most HOT CRACK FOR WELDING P, according to the preheat temperature and the distance L that will reach
1And L
2, under certain speed of welding v, select the eddy-current heating parameter of suitable preheating coil 3 and back heat coil 4, parameter to comprise the distance h of 1 of distance, preheating coil 3 and the workpiece to be welded of 2 of eddy-current heating frequency, preheating coil 3 and the welding guns of preheating coil 3
1, the distance of 2 of back heat coil 4 and welding guns, the back distance h of 1 of heat coil 4 and workpiece to be welded
2, back heat coil 4 diameter and the diameter of back heat coil 4 etc. of eddy-current heating frequency, preheating coil 3, these parameters can be selected the arbitrary value in aforementioned each parameter area.
Floor in the railway car, one is the butt joint of two aluminium alloy sheets, corresponding needed welding parameter is following:
The brittle temperature range of aluminium alloy is: 476 ℃-635 ℃
Distance L
1For: change difference to some extent according to factors such as hot input quantity, welding material, speeds of welding, can be through measuring Thermal Cycle, obtain according to the brittle temperature range of aluminium alloy
Distance L
2For: change difference to some extent according to factors such as hot input quantity, welding material, speeds of welding, can be through measuring Thermal Cycle, obtain according to the brittle temperature range of aluminium alloy
Speed of welding v is: look material to be welded, thickness of slab, hot input quantity and decide
The eddy-current heating frequency of preheating coil 3: 30-100kHz
The distance at the center of preheating coil 3 and welding gun 2 centers: 25-60mm
The distance h that preheating coil 3 and workpiece to be welded are 1
1: 1～5mm
The distance h that back heat coil 4 and workpiece to be welded are 1
2: 1～5mm
The eddy-current heating frequency of back heat coil 4: 30-100kHz
The diameter of preheating coil 3: 30-50mm
The diameter of back heat coil 4: 30-50mm
5, workpiece 1 to be welded is fixed on the welding job platform 15 through Clamp for welding; Open two water-circulating cooling devices 14; Respectively the logical recirculated waters of two induction coil heating apparatus 13 are cooled off making operation machine 8, induction coil heating apparatus 13, controller 12, the source of welding current 16, and the power supply of temperature sensor 11.
Preheating coil 3, welding gun 2, back heat coil 4 have been moved to welding position respectively through the running mechanism on the manipulator 86,5,7 and put; Wherein, Preheating coil 3 is positioned at directly over the weld seam and is positioned at the place ahead of welding gun 2; Back heat coil 4 is positioned at directly over the weld seam and is positioned at the rear of welding gun 2, and preheating coil 3 has been positioned at solder joint.
When 6, beginning welding process, the coil heats equipment 9 of preheating coil 3 gives the preheating coil 3 energisings, and simultaneously, welding job platform 15 drives workpiece 1 to be welded and steadily moves with speed v, and the weld seam that preheating coil 3 is at first treated welding work pieces 1 carries out preheating.Be positioned at welding during starting point when welding gun 2 moves to, the electric arc that ignites begins welding.
Simultaneously, temperature sensor 11 detects the temperature of weld seam, is in the brittle temperature range T of workpiece 1 to be welded when weld seam temperature
BWhen interior, with signal feedback to controller 12, controller 12 is received signal, sends instruction for manipulator 8, and manipulator 8 moves on to distance L through running mechanism 7 with back heat coil 4
1To L
2Between scope in, simultaneously, controller 12 sends instruction for the induction coil heating apparatus 13 of back heat coil 4, induction coil heating apparatus 13 wherein gives the back heat coil 4 energisings, is used for the weld seam heating to fast cooling, carries out slow cooling.
When preheating coil 3 leaves workpiece 1 to be welded, cut off the power supply of the coil heats equipment 9 of preheating coil 3, when back heat coil 4 leaves workpiece 1 to be welded fully, cut off the power supply of the coil heats equipment 10 of back heat coil 4.
So far, welding process is all accomplished.
As stated, in conjunction with the given scheme content of accompanying drawing, can derive the similar techniques scheme.In every case be the content that does not break away from technical scheme of the present invention, to any simple modification, equivalent variations and modification that above embodiment did, all still belong in the scope of technical scheme of the present invention according to technical spirit of the present invention.
Claims (10)
1. method with weldering electromagnetic induction heating control HOT CRACK FOR WELDING P is characterized in that:
Before welding, at first confirm the brittle temperature range T of workpiece to be welded (1)
B, simultaneously, confirm brittle temperature range T
BCeiling temperature T1 and lower limit temperature T2 correspondence position apart from the distance L of the welding pool central authorities of workpiece to be welded (1)
1And L
2
In the place ahead of welding gun (2) one preheating coil (3) is set, a back heat coil (4) is set at the rear of welding gun (2), said welding gun (2), preheating coil (3) and back heat coil (4) all be arranged on weld seam directly over the position, wherein make preheating coil (3) be positioned at solder joint;
In the welding process, the weld seam that said preheating coil (3) is at first treated welding work pieces (1) carries out preheating, and when welding gun (2) moved to the welding starting point, the electric arc that ignites began welding, simultaneously, detected the temperature of weld seam, when weld seam temperature is in brittle temperature range T
BIn the time of in the scope, move back heat coil (4) to said distance L
1To L
2Between scope in, the weld seam that is cooling off is heated the realization slow cooling, accomplish until whole welding.
2. the method with weldering electromagnetic induction heating control HOT CRACK FOR WELDING P according to claim 1; It is characterized in that: before welding; Get a testpieces that can reflect actual workpiece to be welded (1) temperature field; Under actual welding technology,, measure the field of welding temperature of this testpieces, the distance L on the confirmed test part between welding pool central authorities and brittle temperature range ceiling temperature T1 and lower limit temperature T2 to this testpieces welding
1And L
2Thereby, confirm the welding pool central authorities of workpiece to be welded (1) and the distance L between brittle temperature range ceiling temperature T1 and lower limit temperature T2
1And L
2
3. one kind is adopted the device of method according to claim 1; It is characterized in that: comprise welding gun (2); One preheating coil (3) is set in the place ahead of said welding gun (2); One back heat coil (4) is set at the rear of said welding gun (2); Said welding gun (2), preheating coil (3) and back heat coil (4) all be arranged on weld seam directly over the position, on said welding gun (2), preheating coil (3) and back heat coil (4), be fixedly connected a running mechanism (5,6,7) respectively, said running mechanism (5,6,7) is controlled by manipulator (8); Said preheating coil (3) and back heat coil (4) are connected with respective coil firing equipment (9,10) respectively; On said back heat coil (4), a temperature sensor (11) is set again, said temperature sensor (11) is connected with the input of controller (12), and the output of said controller (12) is connected with the firing equipment (10) of said manipulator (8) and back heat coil.
4. device according to claim 3 is characterized in that: said coil heats equipment (9,10) is formed by induction coil heating apparatus (13) and for this heater (13) provides water-cooled water-circulating cooling device (14).
5. device according to claim 3 is characterized in that: said preheating coil (3) and back heat coil (4) are processed by the red copper material.
6. device according to claim 3 is characterized in that: the centre distance of the center of said preheating coil (3) to said welding gun (2) electric arc is 25mm to 60mm.
7. device according to claim 3 is characterized in that: the welding pool central authorities and this welding material brittle temperature range T that are centered close to workpiece to be welded (1) of said back heat coil (4)
BDistance L between ceiling temperature T1 and lower limit temperature T2 correspondence position
1And L
2Between.
8. device according to claim 3 is characterized in that: the distance between the upper surface of the lower surface distance workpiece to be welded (1) of said preheating coil (3) and back heat coil (4) is 1-5mm.
9. device according to claim 8 is characterized in that: the distance between the upper surface of the lower surface distance workpiece to be welded (1) of said preheating coil (3) and back heat coil (4) is 1-2mm.
10. device according to claim 3 is characterized in that: the diameter of said preheating coil (3) and back heat coil (4) is 30-50mm.
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|---|---|---|---|
| CN2010102699879A CN102380688A (en) | 2010-09-02 | 2010-09-02 | Method and device for controlling welding hot cracking during welding by performing electromagnetic induction heating |
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|---|---|---|---|
| CN2010102699879A CN102380688A (en) | 2010-09-02 | 2010-09-02 | Method and device for controlling welding hot cracking during welding by performing electromagnetic induction heating |
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| CN114734129A (en) * | 2022-03-02 | 2022-07-12 | 上海工程技术大学 | Electric arc welding pre-welding preheating and post-welding slow cooling device |
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| CN115846920A (en) * | 2022-11-28 | 2023-03-28 | 厦门海辰储能科技股份有限公司 | Welding method of battery sealing nail |
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