A device and method for controlling residual stress of a dissimilar welded pipe

Abstract

The application provides a device and method for controlling residual stress of a heterogeneous welded pipe. The device comprises a fixing support, a magnetic switch, a magnetic conductive block, an ultrasonic exciter, a fixed flange and a wedge. The fixing support is provided with a groove for installing the heterogeneous welded pipe to be controlled. The fixing support is provided with a first through hole, and the magnetic switch is fixed in the first through hole. The first contact surface of the magnetic conductive block is adsorbed to the end of the magnetic switch. The fixing support is provided with a second through hole, and a plurality of fixing holes are arranged around the second through hole on the fixing support. The center of the fixed flange is provided with a third through hole, and a longitudinal through hole is arranged around the third through hole on the fixed flange. The longitudinal through hole is matched with the fixing hole, and is used for fixing the fixed flange to the fixing support. The ultrasonic exciter passes through the third through hole and the second through hole, and is fixed to the fixing support. The end of the ultrasonic exciter is connected with the first contact surface of the wedge. The device provided by the application has a simple structure, and can quickly and efficiently perform ultrasonic control on the weld stress of the heterogeneous welded pipe.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of material performance, in particular to a device and method for regulating residual stress of a heterogeneous welded pipe. BACKGROUND

[0002] With the development of technology, the pipeline of single performance material has been unable to meet the needs of certain specific scenarios, so various industries are widely seeking heterogeneous welded pipes to take into account the performance of various materials, so as to meet the needs of different scenarios. However, in the process of welding the heterogeneous pipe, due to the large difference in performance of the heterogeneous materials, it is inevitable that a non-uniformly distributed residual stress field will be generated at the weld. Stress concentration will cause deformation, cracking, corrosion at the welded joint of the heterogeneous pipe, and even seriously affect the stability, mechanical properties and service life of the pipeline during subsequent use.

[0003] Traditional methods for regulating residual stress include natural aging, heat treatment, mechanical impact and the like. However, the natural aging method takes a long time, occupies a large amount of space, and the regulating effect is uncontrollable. The heat treatment method has high energy consumption, serious pollution, and is difficult to handle large pipelines. The mechanical impact method is easy to cause damage to the surface of the pipeline components. Therefore, the traditional residual stress regulating method is no longer used today. SUMMARY

[0004] In view of the above problems of the prior art, the present application provides a device for regulating residual stress of a heterogeneous welded pipe, comprising: a fixed support, a magnetic switch, a magnetic block, an ultrasonic exciter, a fixed flange, and a wedge; one side of the fixed support is provided with a groove for installing the heterogeneous welded pipe to be regulated; the fixed support is provided with a first through hole matched in shape with the magnetic switch, the magnetic switch is fixed in the first through hole, the first contact surface of the magnetic block is adsorbed at the end of the magnetic switch, and the second contact surface of the magnetic block is in the shape of the groove; the fixed support is provided with a second through hole matched in shape with the ultrasonic exciter, and a plurality of fixing holes are arranged around the second through hole on the fixed support; the center of the fixed flange is provided with a third through hole matched in shape with the ultrasonic exciter, at least one longitudinal through hole is arranged around the third through hole on the fixed flange, the longitudinal through hole is matched with the fixing hole for fixing the fixed flange to the fixed support; the ultrasonic exciter passes through the third through hole and the second through hole and is fixed to the fixed support through the fixed flange, the end of the ultrasonic exciter is connected with the first contact surface of the wedge, and the second contact surface of the wedge is in the shape of the groove.

[0005] According to the above, the residual stress regulating device of the heterogeneous welded pipe can fix the heterogeneous welded pipe to be regulated through the magnetic attraction switch and the magnetic conductive block, and then inject high-energy ultrasonic waves to the stress concentration area through the cooperation of the ultrasonic exciter and the wedge, so as to achieve the effect of reducing and homogenizing the welding residual stress. Based on the device provided in the aspect, the residual stress can be reduced and homogenized without changing the existing welding process of the heterogeneous pipe. The device is small in size, light in weight, and easy to use. The magnetic attraction switch is used to adsorb the heterogeneous pipe, which can effectively realize the firm installation of the heterogeneous pipe and does not cause secondary damage such as indentation and deformation to the pipe. In addition, the ultrasonic exciter is fixed to the fixed support through the fixed flange, and the pre-tightening force during the fixing is adjustable, so that the regulation signal can be effectively transmitted to the inside of the stress concentration area of the heterogeneous pipe, thereby improving the regulation effect.

[0006] As an optional implementation manner of the first aspect, the side wall of the fixed flange is provided with at least one horizontal threaded hole, the threaded hole is perpendicular to the third through hole, and the threaded hole is used to fasten the ultrasonic exciter to the fixed flange through a fastener.

[0007] According to the above, the ultrasonic exciter can be fastened to the fixed flange through the cooperation of the fastener and the threaded hole.

[0008] As an optional implementation manner of the first aspect, the contact surface of the ultrasonic exciter and the wedge is coated with a coupling agent; and the contact surface of the wedge and the heterogeneous welded pipe to be regulated is coated with a coupling agent.

[0009] According to the above, the coupling agent is applied to the contact surface of the ultrasonic exciter and the wedge, and the coupling agent is applied to the contact surface of the wedge and the heterogeneous welded pipe to be regulated, so that the ultrasonic energy loss generated by the ultrasonic exciter can be reduced, and the ultrasonic energy can be input into the heterogeneous pipe as much as possible.

[0010] As an optional implementation manner of the first aspect, the stress concentration area of the heterogeneous welded pipe to be regulated is in contact with the second contact surface of the wedge.

[0011] According to the above, the stress concentration area of the heterogeneous welded pipe to be regulated is in contact with the second contact surface of the wedge, so that the ultrasonic energy can be input into the heterogeneous pipe as much as possible, and the regulation effect is improved.

[0012] As an optional implementation manner of the first aspect, the number of the magnetic attraction switches is at least one; and when the number of the magnetic attraction switches is multiple, the multiple magnetic attraction switches are located on the same side of the fixed support.

[0013] As an optional implementation of the first aspect, the parameters of the control signal emitted by the ultrasonic exciter are adjustable to adapt to different heterogeneous welded pipes to be controlled, wherein the parameters include frequency, amplitude, phase, waveform, and / or incident angle.

[0014] Therefore, by adjusting the parameters of the control signal to achieve optimal residual stress elimination and homogenization effect, the residual stress control precision is improved.

[0015] As an optional implementation of the first aspect, the length of the fixing support is adjustable to adapt to different lengths of the heterogeneous welded pipe to be controlled.

[0016] Therefore, by setting the length of the fixing support to be adjustable, different lengths of the heterogeneous pipe can be adapted, and the adaptability of the device is improved.

[0017] The second aspect of the present application provides a method for controlling residual stress of a heterogeneous welded pipe based on the above-mentioned first aspect of the residual stress control device, comprising: fixing the heterogeneous welded pipe to be controlled in the groove of the control device; and emitting a control signal to the heterogeneous welded pipe to be controlled by the ultrasonic exciter until the residual stress of the heterogeneous welded pipe to be controlled meets the requirements.

[0018] As an optional implementation of the second aspect, the fixing of the heterogeneous welded pipe to be controlled in the groove of the control device comprises: selecting a groove, a magnetic guide block, and a wedge block of a fixing support with appropriate curvature according to the curvature of the heterogeneous welded pipe to be controlled; fixing the heterogeneous welded pipe to be controlled in the device by controlling the adsorption force of the magnetic attraction switch, and pressing the ultrasonic exciter on the stress concentration area of the heterogeneous welded pipe to be controlled through the wedge block.

[0019] The effective effects of the present aspect can refer to the beneficial effects of each item of the first aspect.

[0020] These and other aspects of the present application will be more apparent from the following description of the (multiple) embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0021] The various technical features of the present application and the relationship between them will be further described below with reference to the accompanying drawings. The drawings are exemplary, some technical features are not shown in actual proportion, and some technical features in the drawings can be omitted, which are conventional in the technical field to which the present application belongs and are not essential for understanding and implementing the present application, or additional technical features are shown, which are not essential for understanding and implementing the present application, that is, the combination of various technical features shown in the drawings is not used to limit the present application. In addition, the same reference signs refer to the same contents throughout the present application. The specific drawings are as follows:

[0022] Figure 1 A structural schematic diagram of a residual stress regulation device for a heterogeneous welded pipe provided by the embodiment of the present application is shown in FIG. 1.

[0023] Figure 2a A front view of the residual stress regulation device for the heterogeneous welded pipe provided by the embodiment of the present application is shown in FIG. 2.

[0024] Figure 2b A top view of the residual stress regulation device for the heterogeneous welded pipe provided by the embodiment of the present application is shown in FIG. 3.

[0025] Figure 2c A left view of the residual stress regulation device for the heterogeneous welded pipe provided by the embodiment of the present application is shown in FIG. 4.

[0026] Figure 3 A flow chart of a residual stress regulation method for the heterogeneous welded pipe provided by the embodiment of the present application is shown in FIG. 5. DETAILED DESCRIPTION

[0027] In order to make the objectives, technical solutions and advantages of the present application clearer, the embodiments of the present application will be further described in detail below with reference to the accompanying drawings.

[0028] It should be understood that the embodiments of the present application provide a residual stress regulation device and method for a heterogeneous welded pipe, and since the principles of the technical solutions for solving the problems are the same or similar, in the following introduction of specific embodiments, some repeated parts can not be described again, but should be regarded as mutual reference and mutual combination between the specific embodiments.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. If there is an inconsistency, the meaning as explained in the specification or derived from the content described in the specification shall prevail. In addition, the terms used herein are only for the purpose of describing the embodiments of the present application and are not intended to limit the present application.

[0030] The residual stress regulation device for a heterogeneous welded pipe provided by the embodiments of the present application will be described in detail below with reference to the accompanying drawings. Among them, Figure 1 A structural schematic diagram of a residual stress regulation device for a heterogeneous welded pipe provided by the embodiment of the present application is shown in FIG. 1. Figure 2a A front view of the residual stress regulation device for the heterogeneous welded pipe provided by the embodiment of the present application is shown in FIG. 2. Figure 2b A top view of the residual stress regulation device for the heterogeneous welded pipe provided by the embodiment of the present application is shown in FIG. 3. Figure 2c A left view of the residual stress regulation device for the heterogeneous welded pipe provided by the embodiment of the present application is shown in FIG. 4.

[0031] Referring to the accompanying drawings, the residual stress control device 10 for the heterogeneous welded pipe includes a fixed bracket 110, a magnetic switch 120, a magnetic block 130, an ultrasonic exciter 140, a fixed flange 150, and a wedge 160.

[0032] The fixed bracket 110 has a groove a on one side for mounting the dissimilar welded pipe P to be adjusted. For ease of description, the side with the groove is defined as the lower surface of the fixed bracket 110, and the side opposite to it is the upper surface. It should be understood that the concepts of upper and lower surfaces are defined only for ease of description and do not constitute a limitation on the technical solution of this application.

[0033] The fixed bracket 110 is provided with a first through hole that matches the shape of the magnetic switch 120. In this embodiment, the magnetic switch 120 is fixed in the first through hole by bolts.

[0034] In some embodiments, the number of magnetic switches 120 can be one or more, and the more magnetic switches 120 there are, the stronger the magnetic attraction, thereby more firmly fixing the heterogeneous welded pipe P to be controlled. The number of first through holes can be determined according to the number of magnetic switches 120; that is, the fixing bracket 110 is provided with a corresponding number of first through holes based on the number of magnetic switches 120 included in the device. In this embodiment, as... Figure 1 The structural diagram shown indicates that the number of magnetic switches 120 can be set to 2. Correspondingly, the number of first through holes is also 2.

[0035] As one implementation, when there are multiple magnetic switches 120, they can be placed on the same side of the fixed bracket 110, so that the ultrasonic exciter 140 can be placed on the other side of the fixed bracket 110. This allows the ultrasonic exciter 140 to be close to the weld area where the stress of the heterogeneous welded pipe P is concentrated, thereby effectively transmitting the control signal emitted by the ultrasonic exciter 140 to the stress concentration area to improve the stress control effect.

[0036] like Figure 2a As shown, the first contact surface of the magnetic block 130 is magnetically attracted to the end of the magnetic switch 120, wherein the end of the magnetic switch 120 is located on the lower surface of the fixed bracket 110, and correspondingly, the switching end of the magnetic switch 120 is located on the upper surface of the fixed bracket 110. The second contact surface of the magnetic block 130 matches the shape of the groove a and is used to attract the heterogeneous welded tube P to be controlled.

[0037] In some embodiments, the magnetic attraction switch 120 can control its magnetism by switch state, i.e., opening the magnetic attraction switch 120 to generate strong magnetism to attract the heterogeneous welding pipe P to be regulated at the beginning of work, and closing the magnetic attraction switch 120 to make the magnetic attraction force disappear at the end of work, so as to unload the heterogeneous welding pipe P to be regulated.

[0038] The fixed support 110 is provided with a second through hole matched with the shape of the ultrasonic exciter 140, and a plurality of fixing holes are further arranged around the second through hole on the fixed support 110.

[0039] The center of the fixed flange 150 is provided with a third through hole matched with the shape of the ultrasonic exciter 140, and a longitudinal through hole is arranged around the third through hole on the fixed flange 150, which is matched with the fixing hole on the fixed support 110, and is used to press the fixed flange 150 to the fixed support 110 by the fastening bolt and the spring. In this embodiment, the number of fixing holes and longitudinal through holes is matched, as shown. Figure 2c In other embodiments, the number can be changed.

[0040] The ultrasonic exciter 140 passes through the third through hole on the fixed flange 150 and the second through hole on the fixed support 110, and is fixed to the fixed support 110 by the fixed flange 150 with a certain pre-tightening force generated by the fastening bolt and the spring that press the fixed flange 150 to the fixed support 110.

[0041] As an implementation manner, the side wall of the fixed flange 150 can also be provided with a horizontal threaded hole, which is perpendicular to the third through hole in the center of the fixed flange 150, and is used to fasten the ultrasonic exciter 140 to the fixed flange 150 by screwing a jackscrew into the threaded hole. In some embodiments, the number of threaded holes can be set arbitrarily according to actual needs, as long as the ultrasonic exciter 140 can be fastened to the fixed flange 150.

[0042] As Figure 2aAs shown, the first contact surface of the wedge 160 is connected to the end of the ultrasonic exciter 140 by a bolt or a stud bolt. The end of the ultrasonic exciter 140 is located at the lower surface of the fixed support 110. The second contact surface of the wedge 160 matches the shape of the groove a and is used to adsorb the heterogeneous welded pipe P to be regulated. In some embodiments, the contact surfaces of the ultrasonic exciter 140 and the wedge 160 can be coated with a coupling agent, and the contact surface of the wedge 160 and the heterogeneous welded pipe P to be regulated can also be coated with a coupling agent. Thus, the high-energy ultrasonic waves generated by the ultrasonic exciter 140 can be injected into the wedge 160 through the coupling agent, and the wedge 160 can input the high-energy ultrasonic waves to the weld of the heterogeneous welded pipe P to be regulated through the coupling agent to reduce and homogenize the residual stress.

[0043] As an implementation, the groove a, the magnetic conducting block 130, and the wedge 160 are replaceable, so that the groove a, the magnetic conducting block 130, and the wedge 160 of the fixed support with different curvatures are replaced to adapt to the curvature and shape of the heterogeneous welded pipe P to be regulated, so that the device 10 closely fits the heterogeneous welded pipe P to be regulated.

[0044] As an implementation, the length of the fixed support 110 can be adjusted, so that it can adapt to different lengths of the heterogeneous welded pipe P to be regulated, and the stress concentration area of the heterogeneous welded pipe P to be regulated can be in contact with the second contact surface of the wedge 160, so that the high-energy ultrasonic waves generated by the ultrasonic exciter 140 can be injected into the stress concentration area to the maximum extent, thereby reducing or homogenizing the residual stress.

[0045] As an implementation, the fixed support 110 can be set as a telescopic structure, for example, the connection between the side of the magnetic attraction switch 120 and the side of the ultrasonic exciter 140 can be set as a telescopic structure. When the length of the fixed support 110 is stretched to match the length of the heterogeneous welded pipe P to be regulated, the length can be fixed by a bolt or the like, so that the length of the fixed support 110 can be adjusted.

[0046] As an implementation, the number of ultrasonic exciters 140 is variable. The present application only takes one ultrasonic exciter 140 in the device 10 as an example for description. Multiple ultrasonic exciters can be set according to actual needs, and only the structures related to the ultrasonic exciter 140 need to be duplicated.

[0047] In some embodiments, the high-energy ultrasonic waves (i.e., the regulation signal) emitted by the ultrasonic exciter 140 can be a transverse wave and / or a longitudinal wave. The parameters of the high-energy ultrasonic waves can be adjusted according to different materials and / or different wall thicknesses of the heterogeneous pipe, etc. The parameters can include frequency, amplitude, phase, waveform, and / or incident angle.

[0048] As an implementation manner, the ultrasonic exciter 140 can be in communication connection with the controller (both in the form of signal line connection and wireless connection), and the controller sends a control signal to the ultrasonic exciter 140, and the ultrasonic exciter 140 performs residual stress ultrasonic control processing work of corresponding waveform, frequency, amplitude, phase, etc. after receiving the control signal.

[0049] Specifically, the high-energy ultrasonic wave reduces and homogenizes the residual stress according to the elastic-plastic ultrasonic induction theory and the particle properties of elastic waves. When the high-energy ultrasonic wave propagates in the material in the form of reciprocal vibration of particles, the focusing energy of the ultrasonic wave reaches a certain degree, which also reduces and dissipates the constraint force between the lattices or particles in the material, thereby changing the constraint state of the residual stress between the lattices in the material, achieving the purpose of directional and quantitative reduction and homogenization of the residual stress. Adjusting the residual stress by high-energy ultrasonic waves has many advantages such as short time consumption, low energy consumption, and no damage to the components.

[0050] Since the high-energy ultrasonic wave has certain beam pointing characteristics, the residual stress control device 10 provided in the embodiment is used to emit multiple beams of high-energy ultrasonic waves in a certain range by the ultrasonic exciter 140, and by effectively adjusting the parameters of the high-energy ultrasonic waves, the high-energy ultrasonic waves are injected into the specified position of the device material to be controlled, so that the purpose of reducing and homogenizing the residual stress can be achieved without changing the original material lattice texture and mechanical physical properties. In addition, since the parameters of the high-energy ultrasonic wave are adjustable in real time, the problem of material performance degradation caused by excessive energy in the focusing area of the high-energy ultrasonic beam can be avoided, and the performance of the material is ensured.

[0051] Another embodiment of the present application provides a method for residual stress control by using the residual stress control device 10 of the heterogeneous welded pipe, as shown in Figure 3 The method includes steps S310-S320, and each step will be described in detail below.

[0052] S310: Fix the heterogeneous welded pipe to be controlled in the groove of the residual stress control device of the heterogeneous welded pipe.

[0053] Specifically, the groove of the fixing bracket, the magnetic block and the wedge block with appropriate curvature are selected according to the curvature of the heterogeneous welded pipe to be controlled, so that the heterogeneous welded pipe to be controlled is tightly fitted with the groove, the magnetic block and the wedge block.

[0054] The residual stress of the heterogeneous welded pipe to be controlled is detected by an external detection device to determine the residual stress concentration area of the heterogeneous welded pipe to be controlled.

[0055] By controlling the opening and closing state of the magnetic attraction switch, the fixed support is attracted to the heterogeneous welding pipe to be controlled through the magnetic attraction switch and the magnetic conductive block. It should be noted that the stress concentration area of the heterogeneous welding pipe to be controlled is tightly attached to the ultrasonic exciter and the wedge through the coupling agent, and then the ultrasonic exciter and the wedge are pressed against the outside surface of the heterogeneous pipe weld with a certain pre-tightening force through the adjusting bolt and the spring, so as to realize the stable clamping of the heterogeneous welding pipe to be controlled.

[0056] S320: The ultrasonic exciter sends a control signal to the heterogeneous welding pipe to be controlled until the residual stress of the heterogeneous welding pipe to be controlled meets the requirements.

[0057] Specifically, the working parameters of the control signal are determined according to the material and / or wall thickness of the heterogeneous welding to be controlled, the control instruction is sent by the upper computer, and the controller sends the control signal to the ultrasonic exciter after receiving the control instruction, so as to make the ultrasonic exciter emit corresponding high-energy ultrasonic waves.

[0058] The high-energy ultrasonic waves are injected into the wedge through the coupling agent between the wedge and the first contact surface, and the wedge inputs the high-energy ultrasonic waves into the stress concentration area of the heterogeneous welding pipe to be controlled through the coupling agent between the wedge and the heterogeneous welding pipe to be controlled for stress reduction and homogenization.

[0059] As an implementation manner, the residual stress of the heterogeneous welding pipe to be controlled can be detected in real time by an external detection device, so as to determine whether the residual stress meets the requirements. If the preset standard is reached, the reduction and homogenization of the residual stress are completed, at this time the magnetic attraction switch is closed to cancel the attraction force, the heterogeneous pipe is taken off from the surface of the heterogeneous welding pipe residual stress control device, and the disassembly is completed.

[0060] In addition, the words "first, second, third, etc." or modules A, modules B, modules C and the like in the specification and claims are only used to distinguish similar objects, and do not represent a specific order of the objects. It can be understood that the specific order or sequence can be interchanged as long as it is allowed, so that the application described herein can be implemented in an order other than that illustrated or described herein.

[0061] In the above description, the labels representing steps, such as S110, S120, etc., do not necessarily mean that the steps are executed in this order, and the order of the steps can be interchanged or executed simultaneously as long as it is allowed.

[0062] The term "comprising" as used in the specification and in claims includes everything within the scope of the word "comprising" and does not exclude other elements or steps. Thus, it should be interpreted to cover the terms "consisting of" or "consisting essentially of" in addition to "comprising". Accordingly, the expression "a device comprising means A and B" should not be interpreted as being confined to devices consisting only of component A and B, but also to devices consisting of only component A or of only component B, or devices consisting of more than one component A and more than one component B.

[0063] Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. Thus, appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment, but can refer to different embodiments. Furthermore, the particular features, structures, or characteristics can be combined in any suitable manner in one or more embodiments.

[0064] It is noted that the foregoing are merely preferred embodiments of the present application and the principles of technology used. It is understood by those skilled in the art that the present application is not limited to the specific embodiments described herein, and that various obvious changes, adjustments and substitutions can be made by those skilled in the art without departing from the scope of the present application. Therefore, although the present application has been described in detail through the above embodiments, the present application is not limited to the above embodiments, and more other equivalent embodiments can be included without departing from the concept of the present application, and all fall within the scope of the present application.

Claims

1. A device for regulating residual stress in heterogeneous welded pipes, characterized in that, include: Fixed bracket, magnetic switch, magnetic block, ultrasonic exciter, fixed flange, and wedge; One side of the fixed bracket is provided with a groove, which is used to install the heterogeneous welded pipe to be controlled; The fixing bracket is provided with a first through hole that matches the shape of the magnetic switch. The magnetic switch is fixed to the first through hole. The first contact surface of the magnetic block is attracted to the end of the magnetic switch. The second contact surface of the magnetic block is the shape of the groove. The fixed bracket is provided with a second through hole that matches the shape of the ultrasonic exciter, and a plurality of fixing holes are provided on the fixed bracket around the second through hole; The fixed flange has a third through hole at its center that matches the shape of the ultrasonic exciter. Around the third through hole, at least one longitudinal through hole is provided on the fixed flange. The longitudinal through hole matches the fixed hole and is used to fix the fixed flange to the fixed bracket. The ultrasonic actuator passes through the third through hole and the second through hole, and is fixed to the fixed bracket by the fixed flange. The end of the ultrasonic actuator is connected to the first contact surface of the wedge, and the second contact surface of the wedge is the shape of the groove. The length of the fixed bracket is adjustable to accommodate heterogeneous welded pipes of different lengths.

2. The apparatus according to claim 1, characterized in that, The side wall of the fixed flange is provided with at least one horizontal threaded hole, which intersects perpendicularly with the third through hole. The threaded hole is used to fasten the ultrasonic exciter to the fixed flange with fasteners.

3. The apparatus according to claim 1, characterized in that, The contact surfaces of the ultrasonic exciter and the wedge are coated with a coupling agent; The contact surface between the wedge and the heterogeneous welded pipe to be controlled is coated with a coupling agent.

4. The apparatus according to claim 1, characterized in that, The stress concentration area of ​​the heterogeneous welded pipe to be regulated comes into contact with the second contact surface of the wedge.

5. The apparatus according to claim 1, characterized in that, The number of magnetic switches is at least one; When there are multiple magnetic switches, the multiple magnetic switches are located on the same side of the fixed bracket.

6. The apparatus according to claim 1, characterized in that, The parameters of the control signal emitted by the ultrasonic exciter are adjustable to adapt to different heterogeneous welded tubes to be controlled, wherein the parameters include frequency, amplitude, phase, waveform, and / or incident angle.

7. A method for controlling residual stress using the device for controlling residual stress in dissimilar welded pipes according to any one of claims 1-6, characterized in that, include: The heterogeneous welded tube to be regulated is fixed in the groove of the regulating device; An ultrasonic exciter sends a control signal to the heterogeneous welded tube to be controlled until the residual stress of the heterogeneous welded tube meets the requirements.

8. The method according to claim 7, characterized in that, The step of fixing the heterogeneous welded tube to be regulated in the groove of the regulating device includes: Select the groove, magnetic block, and wedge of the fixing bracket with appropriate curvature according to the curvature of the heterogeneous welded pipe to be controlled; The heterogeneous welded tube to be regulated is fixed to the device by controlling the adsorption force of the magnetic switch, and the ultrasonic exciter is pressed against the stress concentration area of ​​the heterogeneous welded tube by the wedge.

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