CN104722883A - Novel method and novel device for ultrasonically controlling hot cracks along with welding - Google Patents
Novel method and novel device for ultrasonically controlling hot cracks along with welding Download PDFInfo
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- CN104722883A CN104722883A CN201310723810.5A CN201310723810A CN104722883A CN 104722883 A CN104722883 A CN 104722883A CN 201310723810 A CN201310723810 A CN 201310723810A CN 104722883 A CN104722883 A CN 104722883A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/12—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to investigating the properties, e.g. the weldability, of materials
- B23K31/125—Weld quality monitoring
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/18—Sheet panels
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/08—Non-ferrous metals or alloys
- B23K2103/10—Aluminium or alloys thereof
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Abstract
The invention provides a novel method and a novel device for ultrasonically controlling hot cracks along with welding. The novel device comprises a framework, a workpiece platform, a welding gun and ultrasonic impact devices. The workpiece platform is arranged on the framework and is used for carrying to-be-welded workpieces; the welding gun is arranged on the framework, is arranged above the workpiece platform in such a manner that the welding gun can move relative to the workpiece platform, and is used for welding the workpieces; the ultrasonic impact devices are arranged on the framework and are positioned at the rear of the welding gun, specific distances from the ultrasonic impact devices to the welding gun are kept, transverse squeezing strain can be applied by an impact head of each ultrasonic impact device to weld seam metal in a condensation state at a brittleness temperature interval at the rear of a weld pool, and inherent cracking stretching strain of weld seams can be offset, and accordingly the welding hot cracks can be prevented. The novel method and the novel device have the advantages that the transverse squeezing strain can be applied to the weld seam metal in the condensation state at the brittleness temperature interval at the rear of the weld pools, the inherent cracking stretching strain of the weld seams can be offset, accordingly, the weld hot cracks can be eliminated, and structures tend to be uniform.
Description
Technical field
The invention belongs to welding and ultrasonic technology field, specifically, the present invention be more particularly directed to a kind of ultrasonic wave adopting ultrasonic impact method to control HOT CRACK FOR WELDING P controls fire check new method and device with weldering.
Background technology
Aluminum-aluminum alloy has many good characteristics such as specific strength is high, light specific gravity, easy-formation, corrosion resistance, is therefore widely used in the important feature such as Aeronautics and Astronautics, machine-building.The product for civilian use such as new automobile, train is economize energy and improves performance, and adopt high-strength aluminum alloy material more and more, especially some high strength alumin ium alloy plated construction parts are more common.But due to aluminium alloy heat inherently, mechanical property, as characteristics such as wider brittle temperature range, larger linear expansion coefficient, higher thermal conductivities, when making welding processing technology be applied to aluminium alloy sheet structural member, show hot cracking tendency serious, easy generation fire check, thus bring hidden danger to welded use safety.
HOT CRACK FOR WELDING P is the FAQs existed in welding process, is also the major defect of welded unit.HOT CRACK FOR WELDING P mainly refers in welding process, and Seam and heat effected zone metal is cooled to the crackle produced during the high-temperature region near solidus, and fire check generally produces in the crystallization process of weld seam, therefore also known as solidification cracking or solidification cracking.Solidification cracking is the overwhelming majority produce in Weld pipe mill or weld seam both sides, general in genesis analysis in axis of a weld, or be curvedly distributed in center line both sides, these crackles are all distribute along the crystal boundary of primary crystallization, especially column crystal, solidification cracking is mainly caused by coring.
In order to prevent and treat HOT CRACK FOR WELDING P, generally can set about from metallurgical angle and amechanical angle.From metallurgical angle, mainly through adjusting alloying component and the crystalline structure of weld seam by welding wire, thus reduce brittle temperature range scope or improve the minimum plasiticity index of material at brittle temperature range; Or adopt and such as add the special technological measure such as rare earth element, improve Welding Metallurgy process and weld seam curing condition.Fire check length can be reduced to a certain extent from metallurgical angle, reduce the hot tearing sensitiveness of material, but can not be eliminated it completely.In addition, due to the change of crystallization condition, sometimes with weld strength reduction or solidification cracking is converted into the liquation crack of more difficult control, and welding point part serviceability is sacrificed in the membership that adds of heterogeneous welding wire, makes it have certain limitation in actual applications.
From amechanical angle, mainly reach by stress state when improving welding the object controlling HOT CRACK FOR WELDING P.The metal being in brittle temperature range in welding process in butt welded seam additionally applies certain transverse shear stress strain, to offset in weld seam fracturing elongation strain inherently, reaches the object controlling HOT CRACK FOR WELDING P.
In addition, from amechanical angle, adopt some other to control the method for HOT CRACK FOR WELDING P in addition, as trailing peening method, with weldering rolled-on method, weld with trailing impactive rolling method, electromagnetic method etc., but also all there is respective deficiency in this several method.As trailing peening method, noise is large, weldment shaping surface is bad, have that uneven discontinuous impression exists, mechanical dynamics is difficult to adjustment.With weldering rolled-on method, equipment volume is large, and rolling wheel easily beats arc with welding gun, and butt-welding fitting shape need strictly, is difficult to actual production.Weld with trailing impactive rolling method, the inconvenience of impulsive force size, frequency adjustment, and be still contact hammering, surface of the work leaves impact vestige, and the fatigue strength of joint is affected.Electromagnetic method, arc characteristic is subject to electromagnetic interference, and welding process is unstable.
Summary of the invention
A kind of ultrasonic wave is the object of the present invention is to provide to control the new method of fire check and device with weldering, to realize simple, efficient, energy-conserving and environment-protective and effectively to control HOT CRACK FOR WELDING P.
To achieve these goals, ultrasonic wave provided by the invention comprises with weldering control HOT CRACK FOR WELDING P device: frame; Work piece platform, is located in described frame, for carrying workpiece to be welded; Welding gun, is located in described frame, and can be located at relatively movably above described work piece platform, for welding work pieces with described work piece platform; Ultrasonic impact device, be located in described frame, and be positioned at the rear of described welding gun, keep specific distance, the impact head of described ultrasonic impact device is in the condensing state of brittle temperature range weld metal to welding pool rear applies a transverse shear stress strain, offset the fracturing elongation strain that weld seam is intrinsic, thus avoid the generation of HOT CRACK FOR WELDING P.
Preferably, control in HOT CRACK FOR WELDING P device at above-mentioned ultrasonic wave with weldering, also comprise: platform walking mechanism, be located in described frame, described work piece platform is located at described platform walking mechanism, described platform walking mechanism all around moves in horizontal plane for driving described work piece platform, to realize the relative movement between described work piece platform and described welding gun.
Preferably, control in HOT CRACK FOR WELDING P device with weldering at above-mentioned ultrasonic wave, described ultrasonic impact device comprises two, and the impact head of two described ultrasonic impact devices is separately positioned on the both sides with perpendicular direction, Weld pipe mill cross section.
Preferably, control in HOT CRACK FOR WELDING P device at above-mentioned ultrasonic wave with weldering, the center of described jig is provided with for the appearance of weld groove corresponding with the weld seam of workpiece to be welded, and the formation material of described appearance of weld groove be red copper, width is 4.5 ~ 8mm, the degree of depth is 0.5 ~ 1.5mm, radius is 2.5 ~ 16mm.
Preferably, control in HOT CRACK FOR WELDING P device at above-mentioned ultrasonic wave with weldering, described welding gun, ultrasonic impact device are all be located at adjustably in described frame, so that adjust between described welding gun, ultrasonic impact device and described welding gun, the distance between ultrasonic impact device and workpiece to be welded, angle.
Preferably, control in HOT CRACK FOR WELDING P device at above-mentioned ultrasonic wave with weldering, the active position of two described ultrasonic impact devices is all between the position that the welding pool central authorities of workpiece to be welded are corresponding with the ceiling temperature of brittle temperature range and lower limit temperature.
To achieve these goals, the new method that ultrasonic wave provided by the invention controls fire check with weldering comprises the following steps: the field of welding temperature determining workpiece to be welded; Determine the brittle temperature range of workpiece material to be welded; Workpiece to be welded is fixed on a workbench; Utilize welding gun to weld workpiece to be welded, and in the extension along with weld seam, lateral direction power ultrasonic wave is applied to welding pool rear, obtain transverse shear stress stress to make Weld pipe mill.
Preferably, control, in the new method of fire check, to determine that the step of workpiece field of welding temperature to be welded is as follows: get the testpieces that can reflect actual workpiece temperature field to be welded with weldering at above-mentioned ultrasonic wave; To this testpieces welding under actual welding technique, measure the field of welding temperature of this testpieces; Determine welding pool central authorities and the distance between brittle temperature range ceiling temperature and lower limit temperature on testpieces, thus determine the distance that the welding pool central authorities of workpiece to be welded are corresponding with between brittle temperature range ceiling temperature and lower limit temperature.
Preferably, control, in the new method of fire check, all to apply power ultrasonic in the both sides in the perpendicular direction in welding pool rear and Weld pipe mill cross section with weldering at above-mentioned ultrasonic wave.
Preferably, control in the new method of fire check at above-mentioned ultrasonic wave with weldering, hyperacoustic active position is between the welding pool central authorities of workpiece to be welded and the distance between the material fragility temperature range ceiling temperature of workpiece to be welded and lower limit temperature correspondence position.
Ultrasonic wave of the present invention is provided with the ultrasonic impact device for controlling HOT CRACK FOR WELDING P with weldering control HOT CRACK FOR WELDING P device, and along with welding heat source synchronizing moving, its weld metal that can be in the condensing state of brittle temperature range to rear, molten bath applies a transverse shear stress strain, offset the fracturing elongation strain that weld seam is intrinsic, thus eliminate the generation of HOT CRACK FOR WELDING P, thus meet the mechanical condition controlling HOT CRACK FOR WELDING P.
Meanwhile, the present invention, can refinement weld metal crystal grain owing to adopting ultrasonic pulse effect of vibration, and change the directionality of grain crystalline, makes tissue be tending towards more even, effectively control the generation of HOT CRACK FOR WELDING P from metallurgical crystallization and mechanics two aspects.
Secondly, the present invention is simple and reliable for structure, little by welding space constraint, efficiency is high, the size of ultrasonic vibration, easy to adjust, easily is automated; Active position away from molten bath, arc stability; Weld seam belongs to natural shaped, outward appearance is good; Belong to and control with weldering, with strong points; The change of weld structure composition can not be caused.
Accompanying drawing explanation
Fig. 1 is the structural representation of device embodiment of the present invention;
Fig. 2 is the relative position schematic diagram of weld seam embodiment illustrated in fig. 1 and ultrasonic impact device;
Fig. 3 is that cooling curve of the present invention welds cooling curve comparison diagram with conventional;
The field of welding temperature schematic diagram that Fig. 4 is formed for implementing the present invention.
As shown in Figures 1 to 4, workpiece 1 to be welded, welding gun 2, ultrasonic impact device 3,4, platform walking mechanism 5, welding gun fixture 6, ultrasonic impact device fixture 7,8, the source of welding current 9, argon bottle 10, water-circulating cooling device 11, platform walking mechanism operator 12, ultrasonic impact device generator 13,14, frame 15, workbench 16, base 17, weld jig 18, molten bath 20, the weld seam 191 welded, not yet welds the weld seam 192 of formation, brittle temperature range 200.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in further details.
As shown in Figure 1, ultrasonic wave provided by the invention comprises frame 15 with weldering control HOT CRACK FOR WELDING P device embodiment and is arranged at welding gun 2, ultrasonic impact device 3, ultrasonic impact device 4, the workbench 16 in frame 15.During application, workpiece 1 to be welded is placed on workbench 16.Preferably, arrange an appearance of weld groove in the center of jig 16, material is red copper, and the width of forming tank is 4.5 ~ 8mm, the degree of depth is 0.5 ~ 1.5mm.Welding gun 2 is arranged on position directly over weld seam 191,192 (wherein, weld seam 192 is the weld seam not yet welding formation, and weld seam 191 is the weld seam welded).Two ultrasonic impact devices 3,4 are arranged on the rear of welding gun 2, and the both sides with perpendicular direction, Weld pipe mill cross section (transverse direction) are located in symmetrical status, outside the dual-side of also i.e. workpiece 1 to be welded, as Fig. 2.Welding gun 2 connecting welding power supply 9.Ultrasonic impact device 3,4 is controlled by ultrasonic impact device generator 13,14 respectively.In welding process, welding gun 2 and ultrasonic impact device 3,4 synchronizing moving, and keep specific distance, until all welded.The weld metal that this welding manner can be in the condensing state in brittle temperature range region 200 to rear, molten bath 20 applies a transverse shear stress strain, offsets the fracturing elongation strain that weld seam 191 is intrinsic, thus eliminates the generation of HOT CRACK FOR WELDING P.Meanwhile, can refinement weld seam 191 metal grain, and change the directionality of grain crystalline, make tissue be tending towards more even, effectively control the generation of HOT CRACK FOR WELDING P from metallurgical and mechanics two aspects.
In welding process, should make, between workbench 16 and welding gun 2 and ultrasonic impact device 3,4, relative motion occurs.The present embodiment then adopts that welding gun 2 is fixing, the mode of workbench 16 movement, and the direction of the horizontal arrow of Fig. 1 and Fig. 2 is the welding direction of welding gun 2, contrary with the moving direction of workbench 16.Specifically, fixed platform walking mechanism 5 below workbench 16, platform walking mechanism 5 is controlled by platform walking operator 12, the moving direction of platform walking operator 12 parametric controller walking mechanism 5 and displacement.Preferably, workbench 16 moves by platform walking mechanism, and displacement maximum before and after it is 200mm, and the maximum displacement in left and right is 410mm.In the art, the mechanism realizing left-right and front-back movement in a plane is more, and no longer illustrating at this repeats.Platform walking operator 12 adopts the mode of Non-follow control, and this control mode also exists multiple known technology, is not also separately described in detail here.In the present embodiment, 5, platform walking mechanism is driven by motor, and the guide rail of base 17 is walked, and reached the translational speed of parametric controller walking mechanism 5 by the slewing rate regulating platform walking operator 12 to adjust motor.Preferably, the translational speed of parametric controller walking mechanism 5, between 0 ~ 8mm/s, is also that the speed of welding gun 2 welded seam 191 is between 0 ~ 8mm/s.
Welding gun 2 and ultrasonic impact device 3,4 are fixed in frame 15 respectively by welding gun fixture 6 and ultrasonic impact device fixture 7,8, frame 15 has elongated slot and guide rod etc., move in frame 15 by elongated slot etc. and fix, whereby, the relative position of welding gun 2 and ultrasonic impact device 3,4 is adjusted.
Welding gun 2 is connected with the source of welding current 9, and the source of welding current 9 is connected to argon bottle 10 and water-circulating cooling device 11.Welding gun 2 adopts welding gun fixture 6 to fix.The welding gun fixture of the present embodiment is staight shank welding gun fixture, and it can comprise for being connected to the coupling part in frame 15 and the retained part for clamping welding gun 2.Coupling part comprises the bearing be directly installed in frame 15, bearing is provided with through hole, frame 15 there are two rows be transversely arranged elongated slot, the size of elongated slot and distance corresponding with the position of through hole on bearing, be fixed in frame 15 by set bolt by staight shank welding gun fixture, staight shank welding gun fixture can slide in the horizontal guide of frame 15.Retained part is used for directly clamping welding gun, and is locked by set bolt.Staight shank welding gun can slide up and down along own axes, and adjustment welding gun height to after requiring position, then is fixed with fastening bolt.
Frame 15 comprises frame structure, counterweight (not shown) etc., and its structural shape is numerous, meets the position relationship of welding gun 2, workbench 16 and ultrasonic impact device 3,4, and does not interfere phenomenon.Preferably, bracket height is designed to adjustable, and its four pin are furnished with the height adjustment mechanism of bolt and two nut compositions.Four of frame 15 pin are secured by bolts in the middle of two nuts, by the height regulating lower nut can carry out reconditioner frame, lock top nut after specified altitude assignment to be achieved and just can play the horizontal fixation of maintenance.The method structure is simple, and the fixing effect that can be up to the standard.Frame 15 is provided with and welding gun fixture 6 and ultrasonic impact device fixture 7,8 supporting chutes and through hole.Chute provides certain displacement for welding gun fixture 6 and ultrasonic impact hammer fixture 7, to adjust welding gun 2 and ultrasonic impact hammering distance between 3,4 into shape.Counterweight part is made up of two pieces of counterweight iron blocks, and counterweight iron block is drilled with through hole, is fixed in frame by bolt and nut, reaches the object increasing frame stability.
As this area utilizes ultrasonic wave to carry out impacting the configuration of operation, ultrasonic impact device 3,4 can comprise transducer, ultrasonic transformer, vibration damping sheet, impact bar, the collar and impact first-class.Ultrasonic impact device generator 13,14 controls ultrasonic impact device 3,4 respectively, and transmitting power can be divided into 5 grades, by regulating ultrasonic impact device generator 13,14 to control the size of transmitting power, to meet experiment condition.Ultrasonic impact device 3,4 can be fixed in frame by adjustable bolt and nut.So just realize the adjustment to the adjustment of ultrasonic impact device 3,4 height and the spacing of welding gun 2 and ultrasonic impact device 3,4.
The loading width of ultrasonic impact device 3,4 on workpiece 1 to be welded is the bigger the better, the transverse shear stress stress that Weld pipe mill is obtained is enough large, generally, the minimum loading width of transverse shear stress stress should be greater than 30mm (loading centered by electric arc), more effectively could control HOT CRACK FOR WELDING P.
The field of welding temperature of welding material as shown in Figure 4, the thermal source generally for movement gets oval Gaussian Profile, wherein, T
1represent the brittle temperature range T of material to be welded
bceiling temperature, T
2represent the brittle temperature range T of material to be welded
blower limit temperature, L
1represent brittle temperature range T
bceiling temperature T
1correspondence position apart from the distance of welding pool 20 central authorities of workpiece 1 to be welded, L
2represent brittle temperature range T
blower limit temperature T
2correspondence position is apart from the distance of welding pool 20 central authorities of workpiece 1 to be welded.Different welding materials, its brittle temperature range T
bdifferent, according to the difference of material thickness to be welded, welding pool 20 central authorities and the brittle temperature range T of workpiece 1 to be welded
bceiling temperature T
1with lower limit temperature T
2between distance L
1and L
2also different.Welding material is thicker, and material heat dispersion is better, L
1numerical value is less, and the distance of ultrasonic impact device 3,4 distance welding gun 2 is also nearer.Material to be welded is thinner, and heat rating impact is comparatively large, L
1numerical value is larger, and the distance of ultrasonic impact device 3,4 distance welding gun 2 is also far away.So, as long as accurately determine L before welding
1, L
2two numerical value, just effectively can control the generation of HOT CRACK FOR WELDING P.
As shown in Figure 2, the relative position of ultrasonic impact device 3,4 and welding gun 2.Ultrasonic impact device 3,4 and workpiece to be welded 1, away from weld seam 191, can not pollute weld seam 191, also would not affect the surface quality of weld seam 191.
As shown in Figure 3, T in figure
lline is liquidus curve, T
sline is solidus, T
bfor brittle temperature range, in figure, curve 1 is with weldering ultrasonic impact welding cooling curve, curve 2 is conventional weldering cooling curve, curve 3 is the critical cooling curve not producing HOT CRACK FOR WELDING P, curve cooling velocity is less than curve 3 and can not cracks, and curve cooling velocity is greater than curve 3 and will cracks.Can obviously find out from Fig. 3, after adopting the present embodiment to weld, the weld metal being in the condensing state in brittle temperature range region 200 to rear, molten bath 20 in its welding process applies a transverse shear stress strain, offset the fracturing elongation strain that weld seam 191 is intrinsic, thus eliminate the generation of HOT CRACK FOR WELDING P.
Again as depicted in figs. 1 and 2, below the step utilizing device embodiment of the present invention to weld is described in detail.
First, the brittle temperature range T of the material of workpiece 1 to be welded is determined before welding
b.
As shown in Figure 4, the field of welding temperature of workpiece 1 to be welded is determined.
Preferably, determine that the step of field of welding temperature comprises: get the testpieces that can reflect actual workpiece to be welded 1 temperature field, to this testpieces welding under actual welding technique, measure the field of welding temperature of this testpieces, determine welding pool central authorities and brittle temperature range T on testpieces
bceiling temperature T
1with lower limit temperature T
2, thus determine welding pool central authorities and the brittle temperature range T of workpiece to be welded
bceiling temperature T
1with lower limit temperature T
2between distance L
1, L
2.
Being fixed in frame 15 by weld jig 18 by workpiece 1 to be welded and being positioned on workbench 16, weld seam 192 is corresponding with the appearance of weld groove of aforementioned operation platform 16.Welding gun 2 and ultrasonic impact device 3,4 have been moved to welding position put respectively by welding gun fixture 6, ultrasonic impact device fixture 7,8, wherein welding gun 2 overlaps with weld seam 192 central alignment, ultrasonic impact device 3,4 is positioned at the rear of welding gun 2, and with the both sides of the perpendicular direction of weld seam 192 central cross-section (transverse direction).Along the left and right directions shown in Fig. 1, adjustment welding gun fixture 6, controls the distance between ultrasonic impact hammer 3,4 and welding gun 2.Welding gun 2 has been positioned at solder joint.
Connect the power supply of the source of welding current 9, water-circulating cooling device 11, platform walking mechanism operator 12, ultrasonic impact device generator 13,14.
Adjustment welding gun 2 height, guarantees that welding gun 2 is positioned at the appropriate position (about 2mm) above workpiece 1 to be welded.If welding gun 2 from workpiece 1 to be welded excessively close to, in welding process, because the distortion of workpiece easily makes tungsten electrode and molten bath contact, formed short circuit, block welding; And a large amount of heat produced around arc column in welding process cannot distribute rapidly, the easily protection mouth of burn welding gun.If welding gun 2 is excessive from workpiece 1 to be welded, gas shield weak effect.Therefore the distance between tungsten electrode and workpiece to be welded needs strictly to control.
Start welding.Open the switch of water-circulating cooling device 11, Butt welding gun 2 leads to recirculated water and cools.Open welding machine electric power 9 and argon bottle 10, adjustment welding method, the type of cooling, regulate welding current, weldingvoltage and gas flow.Before work, first welding machine is transferred to inspection gas, reaches after requirement can work until gas flow.
Open ultrasonic impact device generator 13,14, regulate ultrasonic power.Ignite electric arc, start welding, the platform of welding job simultaneously 16 drives workpiece 1 to be welded with speed v steadily movement, when welding gun 2 leaves workpiece 1 to be welded, cut off the source of welding current 9 power supply, when ultrasonic impact device 3,4 leaves workpiece 1 to be welded completely, cut off the power supply of ultrasonic impact device generator 13,14.Cut off the power supply of platform walking mechanism operator 12 simultaneously, quit work.
The LY12 herring-bone form duralumin, hard alumin ium alloy thin plate of, 180 × 100mm thick for 2mm, corresponding required welding parameter is as follows:
Speed of welding v:3-5mm/s.
The percussion power of ultrasonic impact device 3,4: 100w.
Welding current: 80A.
Gas flow: 20L/min.
The type of cooling: water-cooled.
The distance of welding gun tungsten electrode and workpiece to be welded 1: 0 ~ 2mm.
Distance 3 ~ 10mm between welding gun 2 and ultrasonic impact device 3,4.
The loading width of ultrasonic impact device: be greater than 30mm.
Finally, close gas, open fixture, take out workpiece, after water circulation a period of time to be cooled, close water-circulating cooling device.So far, welding process all completes.
To sum up content, the present invention is in welding process, two are arranged for controlling the ultrasonic impact device of HOT CRACK FOR WELDING P with the both sides in perpendicular direction, Weld pipe mill cross section (transverse direction), and along with welding heat source synchronizing moving, the active position of ultrasonic impact device is between the welding pool central authorities of workpiece to be welded and the distance between this welding material brittle temperature range ceiling temperature and lower limit temperature correspondence position, weld metal rear, molten bath being in the condensing state of brittle temperature range applies a transverse shear stress strain, offset the fracturing elongation strain that weld seam is intrinsic, thus eliminate the generation of HOT CRACK FOR WELDING P, thus meet the mechanical condition controlling HOT CRACK FOR WELDING P.
Meanwhile, the present invention, can refinement weld metal crystal grain owing to adopting ultrasonic pulse effect of vibration, and change the directionality of grain crystalline, makes tissue be tending towards more even, effectively control the generation of HOT CRACK FOR WELDING P from metallurgical crystallization and mechanics two aspects.
This apparatus structure is simple and reliable, little by welding space constraint, efficiency is high, the size of ultrasonic vibration, easy to adjust, easily is automated; Active position away from molten bath, arc stability; Weld seam belongs to natural shaped, outward appearance is good; Belong to and control with weldering, with strong points; The change of weld structure composition can not be caused.
As known by the technical knowledge, the present invention can be realized by other the embodiment not departing from its Spirit Essence or essential feature.Therefore, above-mentioned disclosed embodiment, with regard to each side, all just illustrates, is not only.Within the scope of the present invention all or be all included in the invention being equal to the change in scope of the present invention.
Claims (10)
1. ultrasonic wave controls a HOT CRACK FOR WELDING P device with weldering, it is characterized in that, comprising:
Frame;
Work piece platform, is located in described frame, for carrying workpiece to be welded;
Welding gun, is located in described frame, and can be located at relatively movably above described work piece platform, for welding work pieces with described work piece platform;
Ultrasonic impact device, be located in described frame, and be positioned at the rear of described welding gun, keep specific distance, the impact head of described ultrasonic impact device is in the condensing state of brittle temperature range weld metal to welding pool rear applies a transverse shear stress strain, offset the fracturing elongation strain that weld seam is intrinsic, thus avoid the generation of HOT CRACK FOR WELDING P.
2. ultrasonic wave according to claim 1 controls HOT CRACK FOR WELDING P device with weldering, it is characterized in that, also comprises:
Platform walking mechanism, be located in described frame, described work piece platform is located at described platform walking mechanism, and described platform walking mechanism all around moves in horizontal plane for driving described work piece platform, to realize the relative movement between described work piece platform and described welding gun.
3. ultrasonic wave according to claim 1 controls HOT CRACK FOR WELDING P device with weldering, it is characterized in that, described ultrasonic impact device comprises two, and the impact head of two described ultrasonic impact devices is separately positioned on the both sides with perpendicular direction, Weld pipe mill cross section.
4. ultrasonic wave according to claim 1 controls HOT CRACK FOR WELDING P device with weldering, it is characterized in that, the center of described jig is provided with for the appearance of weld groove corresponding with the weld seam of workpiece to be welded, and the formation material of described appearance of weld groove be red copper, width is 4.5 ~ 8mm, the degree of depth is 0.5 ~ 1.5mm.
5. ultrasonic wave according to claim 1 controls HOT CRACK FOR WELDING P device with weldering, it is characterized in that, described welding gun, ultrasonic impact device are all be located at adjustably in described frame, so that adjust between described welding gun, ultrasonic impact device and described welding gun, the distance between ultrasonic impact device and workpiece to be welded, angle.
6. ultrasonic wave according to claim 3 controls HOT CRACK FOR WELDING P device with weldering, it is characterized in that, the active position of two described ultrasonic impact devices is all between the position that the welding pool central authorities of workpiece to be welded are corresponding with the ceiling temperature of brittle temperature range and lower limit temperature.
7. ultrasonic wave controls a new method for fire check with weldering, it is characterized in that, comprises the following steps:
Determine the field of welding temperature of workpiece to be welded;
Determine the brittle temperature range of workpiece material to be welded;
Workpiece to be welded is fixed on a workbench;
Utilize welding gun to weld workpiece to be welded, and in the formation along with weld seam, ultrasonic wave is applied to welding pool rear, obtain transverse shear stress stress to make Weld pipe mill.
8. ultrasonic wave according to claim 7 controls the new method of fire check with weldering, it is characterized in that, determines that the step of workpiece field of welding temperature to be welded is as follows:
Get the testpieces that can reflect actual workpiece temperature field to be welded;
To this testpieces welding under actual welding technique, measure the field of welding temperature of this testpieces;
Determine welding pool central authorities and the distance between brittle temperature range ceiling temperature and lower limit temperature on testpieces, thus determine the welding pool central authorities of workpiece to be welded and the distance between brittle temperature range ceiling temperature and lower limit temperature.
9. ultrasonic wave according to claim 7 controls the new method of fire check with weldering, it is characterized in that, all applies ultrasonic wave in the both sides in the perpendicular direction in welding pool rear and Weld pipe mill cross section.
10. ultrasonic wave according to claim 7 controls the new method of fire check with weldering, it is characterized in that, hyperacoustic active position is between the welding pool central authorities of workpiece to be welded and the distance between the material fragility temperature range ceiling temperature of workpiece to be welded and lower limit temperature correspondence position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310723810.5A CN104722883A (en) | 2013-12-19 | 2013-12-19 | Novel method and novel device for ultrasonically controlling hot cracks along with welding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310723810.5A CN104722883A (en) | 2013-12-19 | 2013-12-19 | Novel method and novel device for ultrasonically controlling hot cracks along with welding |
Publications (1)
| Publication Number | Publication Date |
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| CN104722883A true CN104722883A (en) | 2015-06-24 |
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| CN104931582A (en) * | 2015-06-16 | 2015-09-23 | 南车青岛四方机车车辆股份有限公司 | Thin plate overlap joint narrow weld joint ultrasound fast nondestructive testing method and device |
| CN106825964A (en) * | 2017-04-18 | 2017-06-13 | 温州大学 | A kind of ultrasonic wave argon arc welder |
| CN110860795A (en) * | 2019-12-12 | 2020-03-06 | 大连理工大学 | Laser welding method combining welding-following ultrasound and chilling |
| CN114002391A (en) * | 2021-11-22 | 2022-02-01 | 江苏科技大学 | Method and device for evaluating welding filler material solidification crack sensitivity |
| CN114193054A (en) * | 2021-12-01 | 2022-03-18 | 山海关船舶重工有限责任公司 | Welding tractor capable of eliminating welding deformation along with welding |
| CN114559149A (en) * | 2022-02-10 | 2022-05-31 | 湖北文理学院 | Welding equipment, welding system and welding control method |
| CN117283094A (en) * | 2023-11-22 | 2023-12-26 | 内蒙古工业大学 | Welding system capable of automatically tracking and applying ultrasonic assistance |
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| CN104931582A (en) * | 2015-06-16 | 2015-09-23 | 南车青岛四方机车车辆股份有限公司 | Thin plate overlap joint narrow weld joint ultrasound fast nondestructive testing method and device |
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| CN114002391B (en) * | 2021-11-22 | 2024-03-26 | 江苏科技大学 | Method and device for evaluating solidification crack sensitivity of welding filling material |
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| CN114559149B (en) * | 2022-02-10 | 2024-03-12 | 湖北文理学院 | Welding equipment, welding system and welding control method |
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| CN117283094A (en) * | 2023-11-22 | 2023-12-26 | 内蒙古工业大学 | Welding system capable of automatically tracking and applying ultrasonic assistance |
| CN117283094B (en) * | 2023-11-22 | 2024-01-26 | 内蒙古工业大学 | Welding system capable of automatically tracking and applying ultrasonic assistance |
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Application publication date: 20150624 |