A device for optimizing weld quality by applying ultrasonic impact and electromagnetic auxiliary heating

Abstract

The utility model relates to a device of additional ultrasonic impact and electromagnetic auxiliary heating optimization weld quality belongs to the technical field of weld optimization, it includes welding module, electromagnetic induction heating module and ultrasonic impact module, welding module includes three -axis guide rail, welding torch and welding platform, three -axis guide rail sets up on welding mechanical arm, welding torch sets up on three -axis guide rail, and welding platform is used for placing welding work piece, electromagnetic induction heating module includes electromagnetic induction heater, and electromagnetic induction heater sets up with welding work piece corresponding, ultrasonic impact module includes ultrasonic impact gun, and ultrasonic impact gun can be adjusted and sets up on three -axis guide rail, the utility model discloses device simple structure, high production efficiency, low production cost, and it can solve the problem that the organization grain coarsens, welding residual stress and welding defect etc. in the welding process, thereby strengthening weld structure and mechanical property, prolongs the service life of the welding structure.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of weld optimization, and particularly relates to a device for optimizing weld quality by applying ultrasonic impact and electromagnetic auxiliary heating. BACKGROUND

[0002] Welding has the advantages of excellent connection performance, large rigidity, simple structure and no damage to the cross section of the component, and is an effective and economical connection method in practical engineering applications, and has been widely used in industrial production fields such as urban construction, national defense and military, aerospace and the like. Welding is a rapid heating and rapid cooling process, and the grain of the weld area will be severely coarsened, and residual tensile stress will be generated inside. Due to the influence of subjective and objective factors, welding defects and stress concentration are easily formed in the welding process, so that the weld area becomes a weak part of the entire welded structure, and is prone to fracture failure in the service process, causing serious safety accidents and economic losses. Therefore, it is necessary to perform grain refinement, residual stress elimination and welding defect reduction on the weld area, so as to improve the organization and mechanical properties of the weld, and prolong the service life thereof.

[0003] In order to obtain a weld with excellent performance, domestic and foreign scholars have proposed a variety of methods and devices for optimizing the weld through research. Common mechanical treatment devices include a welding roller device, a welding hammering device, a welding impact roller device and a post-weld shot blasting device. However, these devices also have disadvantages in strengthening the weld, for example: the welding roller device is complex to manufacture and has a high cost, and the roller is prone to interference with the welding torch, causing arcing; the welding hammering device has large hammer head deflection and vibration, the hammering position cannot be accurately controlled, and a specific guide mechanism needs to be added during work; the welding impact roller device can solve the problems of the welding roller and welding impact devices, but it still uses mechanical force to directly impact the surface of the workpiece, the impact force cannot be accurately controlled, and the impact roller needs to be redesigned as the material and shape of the workpiece change.

[0004] Ultrasonic impact technology is to use high-energy ultrasonic waves to drive the ultrasonic impact head to hit the surface of the metal material at a high speed in a very short time. On the one hand, it can produce a certain thickness of nanocrystalline in the material surface layer; on the other hand, it can produce a plastic deformation layer in a certain thickness range, and introduce a residual compressive stress field. Both nanocrystalline and residual compressive stress can improve the hardness, strength and fatigue life of the material. Compared with other mechanical treatment methods, it has the advantages of simple and compact equipment, no pellet recovery, low energy consumption, high efficiency, no restriction on material size, shape and site environment, etc. It is an effective method to eliminate welding residual stress. Electromagnetic induction heating technology is to pass alternating current through the coil to form an alternating magnetic field around the coil. The induced electromotive force will be generated in the workpiece in the alternating magnetic field. Due to the existence of induced electromotive force, induced current will be formed in the workpiece, and then heat will be generated on the workpiece. Compared with traditional heat treatment process, electromagnetic induction heating has the advantages of high power utilization rate, simple operation, fast heating speed and selective local heating. It is a safe, energy-saving and environmentally friendly heat treatment technology.

[0005] Patent CN202011331477.X proposes a device for optimizing ultrasonic magnetic field impact rolling of straight weld of plate, which uses ultrasonic waves to impact and roll the weld. Although this device can solve the problems existing in traditional mechanical impact, the cooling speed during welding is fast, the single impact and rolling effect is general, and in addition, the device also needs to be provided with a special walking mechanism, which occupies a large space and wastes resources.

[0006] Patent CN201010255136.9 discloses an electromagnetic induction heating auxiliary welding impact and rolling weld shaping device, which uses induction heating and welding rolling to optimize the weld. The device provided by the invention needs to provide a cooling system, occupies a large space, and the heating coil how to walk with the welding is not illustrated, which is easy to interfere with the rolling device. In addition, the rolling device is relatively traditional, the rolling effect is general, and the overall working efficiency is low. SUMMARY

[0007] In view of the above problems existing in the prior art, the purpose of the present application is to provide a device for optimizing weld quality by welding ultrasonic impact and electromagnetic auxiliary heating, which has the advantages of simple structure, high production efficiency, low cost and compliance with the concept of low-carbon environmental protection. It can solve the problems of grain coarsening, welding residual stress and welding defects during welding, thereby strengthening the weld structure and mechanical properties, and prolonging the service life of the welded structure.

[0008] The present application provides the following technical solutions:

[0009] The device for optimizing weld quality by external ultrasonic impact and electromagnetic auxiliary heating comprises a welding module, an electromagnetic induction heating module and an ultrasonic impact module; the welding module comprises three-axis guide rails, a welding torch and a welding platform, the three-axis guide rails are arranged on a welding mechanical arm, the welding torch is arranged on the three-axis guide rails, and the welding platform is used for placing a welding workpiece; the electromagnetic induction heating module comprises an electromagnetic induction heater which is arranged correspondingly to the welding workpiece; the ultrasonic impact module comprises an ultrasonic impact gun which is adjustably arranged on the three-axis guide rails. A telescopic rod is mounted on one of the three-axis guide rails, the upper end of the telescopic rod is connected with the guide rail, and the lower end of the telescopic rod is connected with a single-axis guide rail.

[0010] Further, the end of the telescopic rod in the three-axis guide rail is provided with a single-axis guide rail, and the electromagnetic induction heater is slidably arranged on the single-axis guide rail; the electromagnetic induction heater comprises a coil holder, a group of limiting columns are arranged on the coil holder, and a heating coil is wound on the group of limiting columns; the heating coil comprises two groups of oppositely arranged coils, the coils are made of high-frequency copper wires twisted by a plurality of fine copper wires, and the rated load current of the high-frequency copper wire is higher than the working current, so that an additional forced cooling system is not needed, thereby reducing the volume of the overall device. The coils are combined coils, and two semicircles are wound in the coil holder, and the two semicircles are connected through a copper plug, thereby avoiding the problems of complexity and large space occupation of overall winding.

[0011] The coils are connected with an external induction heating power supply, the output end of the induction heating power supply adopts a crystal joint, can be directly inserted into the end of the coil holder, and is connected with the receiving end of the coil through a conductive metal sheet, thereby reducing the influence of the external environment on the connection part and enhancing the sealing property.

[0012] Further, the coils are wound on the same plane, the number of turns is 3-10 turns, and the outer diameter of the coil is 10-25 mm.

[0013] Further, the heating coil is arranged between a distance L1 between a highest temperature point of a fusion line and an austenite transformation temperature A1 point behind a molten pool and a distance L2 between the highest temperature point of the fusion line and a martensite transformation temperature Ms point behind the molten pool, and the distance between the upper surface of the heating coil and the lower surface of a weld on the welding workpiece is 1-5 mm.

[0014] Further, the coil holder is provided with a conductive metal sheet and a wire slot, the input section of the heating coil is fixed in the wire slot 1404, so that the copper wires are prevented from interfering with each other and short-circuiting, and the front end of the heating coil is in contact with the conductive metal sheet, so as to increase the sealing property of the connection part between the output end and the input end.

[0015] Further, the ultrasonic impact gun comprises a front end cover, a piezoelectric ceramic wafer, an electrode sheet, a variable amplitude rod and an ultrasonic impact head connected in sequence; the variable amplitude rod adopts a stepped integrated structure, and a spiral groove is formed on the variable amplitude rod to provide longitudinal vibration amplitude and torsional vibration amplitude.

[0016] The material of the variable amplitude rod 704 is titanium alloy, the total axial length of which is 1 / 2 of the sound wave length in titanium alloy, the outer diameter of the upper cylindrical segment is consistent with the piezoelectric ceramic wafer, which is 50 mm, the diameter of the transition between the middle circular cone segment and the transition segment is 40 mm, and the outer diameter of the end is 20 mm. The resonance frequency of the variable amplitude rod is 18-20 KHz, and the amplitude amplification coefficient is 16.

[0017] Further, the connection between the front end cover, the piezoelectric ceramic wafer and the electrode sheet is sealed by epoxy resin, and the combination forms a transducer, the transducer is connected with the variable amplitude rod through a pre-tightening screw rod, and the ultrasonic impact head is threadedly fastened on the end of the variable amplitude rod.

[0018] Further, the lower surface of the ultrasonic impact head is a plane structure, and the lower surface directly contacts the upper surface of the weld seam.

[0019] Further, a sliding block a is arranged on the long axis of the three-axis guide rail in sliding mode, and an ultrasonic fastening device is fixedly arranged on the sliding block a, and a damping rubber pad is arranged between the ultrasonic fastening device and the sliding block a; the ultrasonic fastening device is located at the contact position of the piezoelectric ceramic wafer and the front end cover and the spiral groove.

[0020] Further, a through groove is arranged in the middle of the welding platform to prevent metal pollution of the workpiece during the welding process.

[0021] By adopting the above technology, compared with the prior art, the beneficial effects of the present application are as follows:

[0022] 1) The present application combines ultrasonic impact and electromagnetic induction heating, and an external magnetic field is applied in the welding process to generate heat in the weld area, thereby increasing the temperature of the local area of the weld, reducing the temperature gradient of the molten pool to increase the composition undercooling area, thereby accelerating the crystallization rate of the weld area, which is beneficial to the formation of uniform and fine equiaxed crystals; at the same time, the contact type ultrasonic impact technology is adopted to periodically impact the weld, thereby introducing ultrasonic energy into the welding molten pool, and the microstructure grains in the weld area are refined again by means of ultrasonic cavitation, mechanical action and thermal effect, which can also effectively prevent the generation of welding cracks, pores and other defects;

[0023] 2) In the present application, the slow cooling mode during welding can reduce quenched structure and improve toughness, effectively enhance the plastic deformation capacity of the weld area, and the ultrasonic impact can relax and redistribute the residual stress of the weld, reduce the welding deformation, and further improve the plastic deformation capacity;

[0024] 3) In the present application, electromagnetic auxiliary heating and ultrasonic impact act on the weld at the same time, the single treatment effect can reach the effect of multiple treatments of other weld optimization technologies, the work efficiency is high, and the induction heating power and the ultrasonic vibration frequency and the impact energy can be accurately controlled through device parameter regulation, the energy consumption can be greatly reduced, and the weld treatment cost can be reduced;

[0025] 4) In the present application, a combined induction coil is used, no cooling device is needed, the device as a whole adopts an integrated structure, so that the device is compact, occupies small space and is flexible to operate;

[0026] 5) In the present application, a spiral groove is formed on the surface of the amplitude transformer, longitudinal torsional vibration is provided, compared with ordinary amplitude transformers, the amplitude can be increased, and the energy output is reduced; and the displacement constraint is fixed at the common node, so that the energy loss in the longitudinal torsional ultrasonic working process is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is the overall structure schematic diagram of the weld optimization device of the present application;

[0028] Figure 2 It is the structure schematic diagram of the ultrasonic impact gun of the present application;

[0029] Figure 3 It is the structure schematic diagram of the ultrasonic fastening device of the present application;

[0030] Figure 4 It is the structure schematic diagram of the electromagnetic induction coil and the coil fixator of the present application, wherein Figure 4 a is the structure schematic diagram of the electromagnetic induction coil, Figure 4 b is the structure schematic diagram of the coil fixator;

[0031] Figure 5 It is the schematic diagram of the device support arm and the moving guide rail of the present application. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and examples of the present application. It should be understood that the specific examples described herein are only used to explain the present application, and are not used to limit the present application.

[0033] On the contrary, the present application covers any substitution, modification, equivalent method and scheme made on the essence and scope of the present application defined by the claims. Further, in order to make the public have a better understanding of the present application, some specific details are described in detail in the following detailed description of the present application. The present application can also be completely understood without the description of these details by those skilled in the art.

[0034] Please refer to Figures 1-5The device for optimizing weld quality by external ultrasonic impact and electromagnetic auxiliary heating mainly comprises three working modules of welding, electromagnetic induction heating and ultrasonic impact. The welding module comprises a welding gun 2, a three-axis guide rail 1 and a welding platform 8, wherein the welding platform 8 has a 3cm-wide vacancy in the middle to prevent metal pollution of the workpiece during welding. The welding gun 2 is installed in the middle of the short shaft of the three-axis guide rail 1 and is tightly connected with a welding mechanical arm 3.

[0035] The three-axis guide rail 1 is made of chromium bearing steel, and one side of the middle short shaft is tightly connected with the welding mechanical arm 3, and the other two sides are respectively connected with an ultrasonic impact support guide rail 103 and an induction heating support guide rail 102. The ultrasonic impact support guide rail 103 is matched with a square slide block to facilitate adjustment of the distance between the welding gun and an ultrasonic impact gun 7. The electromagnetic induction support guide rail 102 provides a route for forward and backward translation to adjust the distance between the coil and the center of the weld, and a telescopic rod 10 connected therewith adjusts the distance between the coil and the lower surface of the weld.

[0036] The main working element of the electromagnetic induction heating module is an electromagnetic induction heater 14. When an induction heating power supply 16 supplies power to the electromagnetic induction heater 14, an alternating magnetic field is generated around the electromagnetic induction heater 14, and the welding workpiece 9 is inducted to generate heat inside. The electromagnetic induction heater 14 is installed on a single-axis guide rail 11 at the end of the telescopic rod 10 through a slide block b12, and the position of the electromagnetic induction heater 14 can be adjusted according to the working condition (preheating before welding or slow cooling after welding). The upper end of the telescopic rod 10 is connected with the induction heating support guide rail 102. The ultrasonic impact module comprises an ultrasonic power supply 15, an ultrasonic impact gun 7 and an ultrasonic fastening device 5. The ultrasonic impact gun 7 can convert the current signal provided by the ultrasonic power supply 15 into a vibration energy source and introduce it into the local area of the weld 901, so as to achieve the purpose of optimizing the weld 901. The ultrasonic impact gun 7 is first installed on the ultrasonic fastening device 5, and then is installed on the ultrasonic impact support guide rail 103 through a slide block a4. In order to ensure the compactness of the overall structure of the device, the three working modules are integrated by means of three-axis connection, so that the welding mechanical arm 3 becomes the only power source, avoiding the problems of resource waste and large space occupation.

[0037] As shown in Figure 2 the amplitude bar 704 of the ultrasonic impact gun 7 in the embodiment is a stepped integrated structure, which reduces stress concentration and ensures the sealing property of the ultrasonic energy transmission process. A spiral groove 705 is formed in the middle section of the amplitude bar 704, the cut radius of the spiral groove 705 is 12mm, and the rotation angle is 108°. This design can make the ultrasonic impact gun 7 generate longitudinal vibration amplitude and torsional vibration amplitude, and can improve the working efficiency of the ultrasonic impact gun 7.

[0038] The transducer adopts a piezoelectric ceramic transducer, which is mainly composed of a front end cover 702, a piezoelectric ceramic wafer 703 and electrode sheets. The piezoelectric ceramic wafer 703 is made of PZT-8 commonly used in engineering, the front end cover 702 is made of hard aluminum LY-12, and the electrode sheets are made of copper material with good conductivity and are arranged between adjacent piezoelectric ceramic wafers 703 for receiving the current signal transmitted by the ultrasonic power supply 15. The transducer is connected with the amplitude transformer 704 through the pre-tightening screw 701, and the front end cover 702, the electrode sheets and the piezoelectric ceramic wafer 703 are glued by epoxy resin to enhance the sealing and improve the ultrasonic transmission efficiency. The ultrasonic impact head 706 is connected with the end of the amplitude transformer 704 through a threaded knob, and the lower surface of the ultrasonic impact head 706 is rectangular with a width of 5-10 mm and a length of 10-20 mm. During work, the ultrasonic impact head 706 can be replaced according to the shape and size of the weld 901.

[0039] In the present embodiment, in order to prevent the ultrasonic vibration from affecting the working process of the welding gun 2, the ultrasonic fastening device 5 is used to fix it, and a layer of rubber shock pad 6 is fixed between the sliding block a4 and the support plate 501 using the bolt 503, so as to avoid the transmission of vibration. And the metal clamp 502 is used to constrain the contact position of the two common displacement nodes, the front end cover 702 and the piezoelectric ceramic wafer 703, and the spiral groove 705, which can greatly reduce the loss of ultrasonic energy during work.

[0040] In the present embodiment, the induction heating power supply 16 adopts an IGBT medium frequency heating power supply, which can convert three-phase alternating current of power frequency 50 Hz into single-phase alternating current of 10-30 kHz. The induction heating power supply 16 transmits current to the electromagnetic induction heater 14 through a cable, and the output end of the cable adopts a crystal head connection mode, which can be directly inserted into the conductive metal sheet 1403 to avoid problems such as poor contact during work. The main element of the electromagnetic induction heater 14 is the heating coil 1401, which is made of copper wire twisted from multiple thin copper wires. In the present embodiment, the copper wire is wound on the limiting column 1405, and the number of turns is determined according to the working requirement, which is 3-10 turns. The outer diameter of the heating coil 1402 is 10-25 mm. The winding method adopts symmetrical winding, which avoids the complexity of overall winding and keeps the two ends of the coil on the same horizontal line, reducing the space occupation. The two wound semicircular coils are connected through a copper plug 1402 with good conductivity, thereby forming a complete heating coil 1401, and four insulation treatment methods are adopted for insulation treatment of the heating coil 1401. The input section of the heating coil 1401 is fixed in the wire slot 1404 to prevent the copper wires from interfering with each other and causing short circuit. The front end is in contact with the conductive metal sheet 1403, which increases the sealing of the connection between the output end and the input end.

[0041] The electromagnetic induction heating module in the embodiment does not need to be provided with a water cooling device, the size of the space occupied by the equipment is reduced, the temperature of the equipment is quickly conducted, the temperature rising speed is 35-50 ℃ / min, the heating is uniform, and the efficiency of the welding heat treatment can be greatly improved. And the overall working element is fixed by using bolts through the bolt holes 1406, avoiding the influence of the ultrasonic impact module.

[0042] In actual operation, first, according to the welding CCT diagram, the austenite transformation temperature A1 and the martensite transformation temperature Ms of the to-be-welded material are determined. An experimental sample is prepared from the to-be-welded workpiece, and the temperature field of the workpiece surface is determined in combination with the welding process parameters, so as to determine the distance L1 between the highest temperature point on the fusion line and the austenite transformation temperature A1 point behind the molten pool and the distance L2 between the highest temperature point on the fusion line and the martensite transformation temperature Ms point behind the molten pool. The heating coil 1401 should be placed between L1 and L2, and after the position is determined, it is adjusted by the sliding block b12 and fixed by the positioning bolt c13. The upper surface of the heating coil 1401 is 1-5 mm away from the lower surface of the weld, which can be realized by adjusting the telescopic rod 10 according to the working condition requirement, and is fixed by the positioning bolt b101. In order to ensure that the weld and the heat affected zone can have sufficient phase transformation time, the diameter dd of the heating coil can be determined according to the welding speed V and the shortest time t for forming 0% martensite. The induction heating power supply 16 has the characteristics of high heating frequency, which can effectively avoid the influence of skin effect on the heating process. The ultrasonic impact gun 7 is arranged behind the welding gun 2, and the distance between the center of the ultrasonic impact head 706 and the center of the welding gun 2 is 25-40 mm. According to the welding seam optimization requirement, the distance between the ultrasonic impact gun 7 and the welding gun 2 is adjusted by adjusting the sliding block a4, and is fixed by the positioning bolt a401. The working frequency of the ultrasonic power supply 15 is 17 KHz, the current is 0.5 A, and the amplitude is 0.006 mm. The ultrasonic impact head 706 can be made according to the forming surface width of the weld 901, and can be replaced at will according to the requirement, and the operation is flexible. In the working process, the ultrasonic impact head 706 applies a certain amplitude of ultrasonic vibration on the surface of the weld 901 in the direction of the weld 901, induces the surface layer to proliferate a large number of dislocations, lattice distortion and grain boundary migration, and promotes the molten pool grain to be greatly refined, and even produces nanocrystalline. And the ultrasonic impact can introduce compressive stress in the weld pool to reduce the welding residual stress, eliminate stress concentration and inhibit the expansion of welding cracks, etc. The electromagnetic induction heater 14 can also be moved to the front of the welding gun 2 by moving the sliding block b12, which plays a role in preheating before welding. The heating coil 1401 is 25-50 mm away from the center of the welding gun, which can uniformly heat the regions on both sides of the groove, prevent the generation of welding cold cracks, hardened structures and stress concentration, and also reduce the output of welding energy.

[0043] The present application utilizes electromagnetic heating and ultrasonic impact to regulate the weld forming process in the welding process, which can effectively slow down the heat dissipation of the weld pool area, release the welding residual stress, eliminate the welding defects, thereby improving the plastic deformation capacity of the welded joint, strengthening the performance of the welded joint, and prolonging the service life. The present application has the advantages of compact structure, small space occupation, low construction cost, high energy utilization rate, fast heating speed, uniform processing and flexible operation in the use process, which makes the present application have the advantages of high efficiency, practicality and energy saving in the aspect of weld optimization, and has a very good prospect in the field.

[0044] The above merely describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A device for optimizing the quality of a weld seam with the application of ultrasonic impact and electromagnetic auxiliary heating, characterized in that it comprises: The welding module, the electromagnetic induction heating module and the ultrasonic impact module; the welding module comprises a three-axis guide rail, a welding gun and a welding platform, the three-axis guide rail is arranged on a welding mechanical arm, the welding gun is arranged on the three-axis guide rail, and the welding platform is used for placing a welding workpiece; the electromagnetic induction heating module comprises an electromagnetic induction heater which is arranged correspondingly to the welding workpiece; the ultrasonic impact module comprises an ultrasonic impact gun which is adjustably arranged on the three-axis guide rail; The end of the telescopic rod in the three-axis guide rail is provided with a single-axis guide rail, and the electromagnetic induction heater is slidably arranged on the single-axis guide rail; the electromagnetic induction heater comprises a coil holder, a plurality of limiting columns are arranged on the coil holder, a heating coil is wound on the plurality of limiting columns; the heating coil is arranged between a distance L1 between a highest temperature point of a fusion line and an austenite transformation temperature A1 point behind a molten pool and a distance L2 between the highest temperature point of the fusion line and a martensite transformation temperature Ms point behind the molten pool, and the distance between the upper surface of the heating coil and the lower surface of a weld on the welding workpiece is 1-5 mm; The ultrasonic impact gun comprises a front end cover, a piezoelectric ceramic wafer, an electrode sheet, an amplitude transformer and an ultrasonic impact head which are connected in sequence; the amplitude transformer adopts a stepped integrated structure, and a spiral groove is formed in the amplitude transformer to provide longitudinal vibration amplitude and torsional vibration amplitude.

2. The device for optimizing the quality of a weld with the application of ultrasonic impact and electromagnetic auxiliary heating according to claim 1, characterized in that The heating coil comprises two groups of oppositely arranged coils, the coils adopt a combined winding mode to form a semicircular winding structure, and the two groups of coils are connected through a copper plug.

3. The device for optimizing the quality of a weld with the application of ultrasonic impact and electromagnetic auxiliary heating according to claim 2, characterized in that The coils are wound on the same plane, the number of turns is 3-10 turns, and the outer diameter of the coil is 10-25 mm.

4. The device for optimizing the quality of a weld with the aid of ultrasonic impact and electromagnetic supplementary heating according to claim 1, characterized in that The coil holder is provided with a conductive metal sheet and a wire slot, the input section of the heating coil is fixed in the wire slot to prevent the copper wires from interfering with each other and causing short circuit, and the front end of the heating coil is in contact with the conductive metal sheet to increase the sealing property of the connection between the output end and the input end.

5. The device for optimizing the quality of a weld with the application of ultrasonic impact and electromagnetic auxiliary heating according to claim 4, characterized in that The connection between the front end cover, the piezoelectric ceramic wafer and the electrode sheet is sealed by epoxy resin to form a transducer, the transducer is connected with the amplitude transformer through a pre-tightening screw rod, and the ultrasonic impact head is threadedly fastened to the end of the amplitude transformer.

6. The device for optimizing the quality of a weld with the application of ultrasonic impact and electromagnetic auxiliary heating according to claim 5, characterized in that The lower surface of the ultrasonic impact head is a plane structure, and the lower surface is directly in contact with the upper surface of the weld.

7. The device for optimizing the quality of a weld with the aid of ultrasonic impact and electromagnetic supplementary heating according to claim 6, characterized in that A sliding block a is slidably arranged on the long axis of the three-axis guide rail, an ultrasonic fastening device is fixedly arranged on the sliding block a, and a damping rubber pad is arranged between the ultrasonic fastening device and the sliding block a; the ultrasonic fastening device is located at the contact position of the piezoelectric ceramic wafer and the front end cover and the spiral groove.

8. The device for optimizing the quality of a weld with the application of ultrasonic impact and electromagnetic auxiliary heating according to claim 1, characterized in that A through groove is arranged in the middle of the welding platform to prevent metal pollution of the workpiece during welding.

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