Ultrasonic welding apparatus

Abstract

An ultrasonic welding device is provided that includes a base pedestal having a recess, an ultrasonic stack disposed on the base pedestal, and an adjustment housing that surrounds the ultrasonic stack and is seated in the recess, wherein the base pedestal and the adjustment housing are configured such that a spacing between the base pedestal and the adjustment housing is adjustable from one side.

Description

Technical Field

[0001] This disclosure relates to an ultrasonic welding apparatus, and more specifically to an ultrasonic welding apparatus capable of easily and precisely adjusting the horizontal position of the welding head relative to the anvil.

[0002] This application claims priority to Korean Patent Application No. 10-2024-0019386, filed on February 8, 2024, the entire contents of which are incorporated herein by reference. Background Technology

[0003] Unlike primary batteries, which cannot be recharged, secondary batteries are rechargeable and dischargeable, and are widely used in electronic devices such as mobile phones, laptops, and portable cameras, as well as in electric vehicles. In particular, lithium secondary batteries have a larger capacity and higher energy density per unit weight than nickel-cadmium or nickel-metal hydride batteries, and therefore their application is rapidly increasing.

[0004] Various manufacturing methods have been proposed and applied to the manufacture of secondary batteries, and various efforts are being made to reduce the defect rate of products. Summary of the Invention

[0005] Technical issues

[0006] The technical problem to be solved by this disclosure is to provide an ultrasonic welding apparatus that can easily and accurately adjust the horizontal position of the welding head relative to the anvil.

[0007] Technical solution

[0008] To address this technical problem, this disclosure provides an ultrasonic welding apparatus comprising: a support having a recess; an ultrasonic stack disposed on the support; and an adjustment housing surrounding the ultrasonic stack and disposed in the recess, wherein the support and the adjustment housing are configured such that the distance between the support and the adjustment housing can be adjusted on one side.

[0009] In some embodiments, the adjustment housing may include a lower housing and an upper housing, and the lower housing and the upper housing may be configured to cooperate with each other to surround the side surface of the ultrasonic stack.

[0010] In some embodiments, the lower housing may include a lower surface that corresponds to the concave surface of the recess of the support.

[0011] In some embodiments, the upper housing and the lower housing can be fastened together by housing fastening bolts.

[0012] In some embodiments, the adjustment housing can be configured to rotate relative to the axis of rotation by adjusting the distance between the support and the adjustment housing.

[0013] In some embodiments, the axis of rotation may be substantially parallel to the extension direction of the ultrasonic stack.

[0014] In some embodiments, the adjustment housing includes through holes respectively disposed on both sides of the ultrasonic stack, and the ultrasonic welding device may further include: a first bolt, which is fastened to the support through the through hole disposed in the adjustment housing on one side of the ultrasonic stack; and a second bolt, which is fastened to the support through the through hole disposed in the adjustment housing on the other side of the ultrasonic stack.

[0015] In some embodiments, a first compression spring may be inserted between the head of the first bolt and the housing of the adjusting part, and a second compression spring may be inserted between the head of the second bolt and the housing of the adjusting part.

[0016] In some embodiments, the spring constants of the first compression spring and the second compression spring may be different from each other.

[0017] In some embodiments, the spring constant of the first compression spring may be greater than the spring constant of the second compression spring.

[0018] In some embodiments, the ultrasonic welding apparatus may further include an adjusting bolt that passes through the support and is capable of contacting the adjusting housing.

[0019] In some embodiments, the adjusting bolt may be configured to advance in the direction of compressing the first compression spring by rotating on its own.

[0020] Another aspect of this disclosure provides an ultrasonic welding apparatus, the ultrasonic welding apparatus comprising: an ultrasonic stack; an adjustment housing surrounding the ultrasonic stack and having a housing protrusion on one side; a support having a support protrusion corresponding to the side of the adjustment housing and configured to at least partially support the adjustment housing; and an adjustment bolt configured to pass through the support protrusion and contact the housing protrusion, wherein the adjustment bolt is configured to adjust the distance between the support protrusion and the housing protrusion.

[0021] In some embodiments, the adjustment housing can be configured to rotate a predetermined angle relative to the axis of rotation by the forward movement of the adjustment bolt.

[0022] In some embodiments, the ultrasonic stack may include a vibration generator and a welding head.

[0023] Beneficial effects

[0024] The ultrasonic welding apparatus according to the embodiments of the present disclosure can easily and accurately adjust the horizontal position of the welding head relative to the anvil, thereby significantly improving the welding quality.

[0025] The technical effects achievable in the exemplary embodiments of this disclosure are not limited to those described above, and other effects not mentioned will be clearly understood by those skilled in the art from the following description of this disclosure. In other words, those skilled in the art can also derive unexpected effects from the exemplary embodiments of this disclosure. Attached Figure Description

[0026] Figure 1 This is a perspective view of an ultrasonic welding apparatus according to one embodiment of the present disclosure.

[0027] Figure 2 This is an exploded perspective view showing the main parts of an ultrasonic welding apparatus according to one embodiment of the present disclosure.

[0028] Figure 3 This is a side view of an ultrasonic welding device.

[0029] Figure 4 yes Figure 3 A magnified view of part A.

[0030] Figure 5 This is an exploded perspective view showing the main parts of an ultrasonic welding apparatus according to another embodiment of the present disclosure. Detailed Implementation

[0031] In the following, preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. However, embodiments of the present disclosure may be modified in various different forms and should not be construed as limiting the scope of the present disclosure to the embodiments described below. Preferably, embodiments of the present disclosure are provided for the purpose of providing a more comprehensive explanation of the disclosure to those skilled in the art. Here, the same reference numerals denote the same elements. Furthermore, various elements and areas in the drawings are shown schematically. Therefore, the present disclosure is not limited to the relative dimensions or spacing shown in the drawings.

[0032] Various components may be described using terms such as first, second, etc., but these components are not limited by these terms. These terms are used only for the purpose of distinguishing one component from another. For example, a first component may be named a second component, and vice versa, without departing from the scope of the present disclosure.

[0033] The terminology used in this specification is for illustrative purposes only and is not intended to limit the scope of this disclosure. Unless the context clearly indicates otherwise, singular expressions include plural expressions. The terms “comprising,” “including,” and “having” as used herein refer to the presence of a feature, number, step, action, component, or element or combination thereof described in the specification, and it should be understood that the possibility of the presence or addition of one or more other features, numbers, steps, actions, components, elements, or combinations thereof is not excluded in advance.

[0034] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains. Furthermore, it should be understood that terms such as those commonly defined in dictionaries shall be interpreted as having the same meaning as they have in the context of the art to which they pertain, and shall not be interpreted as having an overly formal meaning unless expressly defined herein.

[0035] A particular sequence of processes may be executed in a different order than that described when some implementations are otherwise available. For example, two processes described as consecutive may be executed substantially simultaneously, or they may be executed in the reverse order of their description.

[0036] In the accompanying drawings, variations in the depicted form may be expected, for example, depending on manufacturing techniques and / or tolerances. Therefore, embodiments of this disclosure should not be construed as limited to specific forms within the areas shown herein, but should include variations in form, for example, resulting from manufacturing processes. All terms “and / or” as used herein include each combination of one or more of the stated components. Additionally, the term “substrate” as used herein may refer to the substrate itself, or to a stacked structure comprising the substrate and any predetermined layers or films formed on its surface. Furthermore, the term “surface of substrate” as used herein may refer to the exposed surface of the substrate itself, or to the outer surface of predetermined layers or films formed on the substrate.

[0037] (First Implementation)

[0038] Figure 1 This is a perspective view of an ultrasonic welding apparatus 100 according to one embodiment of the present disclosure.

[0039] Figure 2This is an exploded perspective view showing the main parts of an ultrasonic welding apparatus 100 according to one embodiment of the present disclosure.

[0040] refer to Figure 1 and Figure 2 The ultrasonic welding apparatus 100 may include: a support 110 having a recess 114; an ultrasonic stack 190 disposed on the support 110; and an adjustment housing 120 surrounding the ultrasonic stack 190 and disposed in the recess 114.

[0041] The ultrasonic stack 190 may include a vibration generator 130 and a welding head (amplifier) ​​140. The vibration generator 130 may include a vibrator 131 that converts electrical energy into mechanical vibration energy and an amplifier 133 that reduces or amplifies the amplitude of the vibrator 131. The vibration energy of the amplifier 133 may be transmitted to the welding head 140 and used to fuse the workpiece.

[0042] The ultrasonic welding apparatus 100 can weld the workpiece by frictional heat by inserting the workpiece between the anvil 180 and the welding head 140 and then vibrating the welding head 140 while applying pressure to it.

[0043] Anvil 180 may include anvil base 181. The upper surface of anvil base 181 may extend substantially horizontally. Anvil 180 may support a workpiece pressurized by welding head 140 from below. In some embodiments, the upper portion of anvil 180 may be configured to be detachable from anvil base 181.

[0044] The vertical distance between the anvil 180 and the welding head 140 can be adjusted. In other words, the vertical distance between the anvil 180 and the welding head 140 can be adjusted by adjusting their relative distance. In some embodiments, the relative distance between them can be adjusted by moving at least one of the anvil 180 and the welding head 140 in the vertical direction. For this purpose, at least one of the anvil 180 and the welding head 140 can be configured to be height-adjustable.

[0045] The welding head 140 can be positioned above the anvil 180. In some embodiments, the welding head 140 can be in the form of a rectangular plate, and the bottom of the welding head 140 can extend longer in one direction (e.g., the X-axis direction). The workpiece can be pressurized and welded between the bottom of the welding head 140 and the anvil 180.

[0046] In some embodiments, at least one of the bottom surface of the welding head 140 and the upper surface of the anvil 180 may be provided with protrusions to improve contact with the workpiece. In this case, markings corresponding to the protrusions may be retained on the workpiece after welding is completed.

[0047] To ensure excellent welding quality, the upper surface of the anvil 180 and the bottom surface of the welding head 140 should remain parallel to each other. The ultrasonic welding apparatus 100 according to an embodiment of this disclosure is configured to adjust the horizontal position of the bottom surface of the welding head 140 corresponding to the upper surface of the anvil 180. Here, the horizontal position of the bottom surface of the welding head 140 can represent an absolute horizontal position associated with an absolute reference (e.g., the direction of gravity), but it can also represent a relative horizontal position relative to the upper surface of the anvil 180.

[0048] As described above, the vibration generator 130 may include a vibrator 131 and an amplifier 133. The vibrator 131 and amplifier 133 may generally have a cylindrical shape. The vibrator 131, amplifier 133, and welding head 140 may be arranged in a linear sequence in a predetermined direction (e.g., the Y-axis direction), and the ultrasonic stack 190 may extend along the predetermined direction. Furthermore, the vibrator 131, amplifier 133, and welding head 140 may have a common central axis.

[0049] The adjustment housing 120 may surround the ultrasonic stack 190. In some embodiments, the adjustment housing 120 may include an upper housing 122 and a lower housing 124, which are fastened to each other with the ultrasonic stack 190 located therebetween. The upper housing 122 and the lower housing 124 may be configured to cooperate with each other to at least partially surround the side surface of the ultrasonic stack 190. In some embodiments, the adjustment housing 120 may be configured to surround the side surface of the vibration generator 130.

[0050] The adjusting housing 120 may further include a fastening member 128 for securing the upper housing 122 and the lower housing 124. In some embodiments, the fastening member 128 may be a housing fastening bolt. The upper housing 122 may have a through hole through which the housing fastening bolt can pass. The lower housing 124 may have a fastening hole corresponding to the through hole, into which the housing fastening bolt can engage.

[0051] The support 110 may have a recess 114 that can partially accommodate the adjustment housing 120. In some embodiments, the recess 114 may have an arcuate cross-section. The lower portion of the adjustment housing 120 may have a shape adapted to be disposed in the recess 114. In other words, the lower surface 124b of the adjustment housing 120 may have a shape corresponding to the concave surface of the recess 114. In some embodiments, the shape corresponding to the concave surface may be a shape complementary to the concave surface.

[0052] In some embodiments, the support 110 and the adjustment housing 120 can be configured such that the distance between them is adjustable on one side. By adjusting the distance between the support 110 and the adjustment housing 120 on one side, the adjustment housing 120 can be rotated relative to the support 110. By rotating the adjustment housing 120 relative to the support 110, the horizontal position of the welding head 140 can be adjusted.

[0053] The axis of rotation of the adjustment housing 120 can be substantially parallel to the extension direction of the ultrasonic stack 190. In some embodiments, the vibrator 131, amplifier 133, and welding head 140 have a common central axis, and the axis of rotation can coincide with the central axis.

[0054] The adjustment housing 120 may have through holes 124h1 and 124h2 respectively provided on both sides of the ultrasonic stack 190. Specifically, the adjustment housing 120 may have a first through hole 124h1, through which a first bolt 151 can pass through on one side of the ultrasonic stack 190. Furthermore, the adjustment housing 120 may have a second through hole 124h2, through which a second bolt 153 can pass through on the other side of the ultrasonic stack 190. The first bolt 151 can pass through the first through hole 124h1 and be fastened to the support 110. Similarly, the second bolt 153 can pass through the second through hole 124h2 and be fastened to the support 110.

[0055] The first bolt 151 can pass through the first through hole 124h1, but may not be threaded into the adjusting housing 120. Similarly, the second bolt 153 can pass through the second through hole 124h2, but may not be threaded into the adjusting housing 120. In this configuration, the adjusting housing 120 can move vertically (e.g., along the Z-axis) along the shank of the first bolt 151.

[0056] exist Figure 1 and Figure 2 In the diagram, the first through hole 124h1 and the second through hole 124h2 are shown as being disposed in the lower housing 124, but this disclosure is not limited thereto. In some embodiments, the through holes may be disposed in the upper housing 122.

[0057] Figure 3 This is a side view of the ultrasonic welding device 100.

[0058] Reference Figure 2 and Figure 3 The first compression spring 151sp can be disposed between the head H of the first bolt 151 and the adjusting housing 120. Furthermore, the second compression spring 153sp can be disposed between the head H of the second bolt 153 and the adjusting housing 120.

[0059] The first compression spring 151sp can apply a force to the adjusting housing 120 in a vertical direction (e.g., the Z-axis direction) between the head H of the first bolt 151 and the adjusting housing 120. Since the first bolt 151 is fastened to the support 110, the head H of the first bolt 151 receives the force from the first compression spring 151sp, but does not move vertically by this force. Simultaneously, the adjusting housing 120 receives the force from the first compression spring 151sp and can move by this force.

[0060] The second compression spring 153sp can apply a force to the adjusting housing 120 in a vertical direction (e.g., the Z-axis direction) between the head H of the second bolt 153 and the adjusting housing 120. Since the second bolt 153 is fastened to the support 110, the head H of the second bolt 153 receives the force from the second compression spring 153sp, but does not move vertically by this force. Simultaneously, the adjusting housing 120 receives the force from the second compression spring 153sp and can move by this force.

[0061] In some embodiments, the spring constant of the first compression spring 151sp may be the same as the spring constant of the second compression spring 153sp.

[0062] In other embodiments, the spring constant of the first compression spring 151sp may be different from the spring constant of the second compression spring 153sp. In some embodiments, the first compression spring 151sp may have a larger spring constant than the second compression spring 153sp. Therefore, the force required for the first compression spring 151sp to compress the same length is greater than the force required for the second compression spring 153sp. Because the spring constant of the first compression spring 151sp is greater than the spring constant of the second compression spring 153sp, the adjusting housing 120 can be based on... Figure 3 The diagram shown receives a force in the counterclockwise direction (in other words, direction 2).

[0063] The ultrasonic welding apparatus 100 may further include an adjusting bolt 160 that penetrates the support 110 and contacts the adjusting housing 120. In some embodiments, the adjusting bolt 160 may contact the lower surface of the housing protrusion 126 of the adjusting housing 120. In some embodiments, the support 110 has a support protrusion 116 corresponding to the housing protrusion 126, and the adjusting bolt 160 may penetrate the support protrusion 116 and contact the housing protrusion 126.

[0064] Figure 4 yes Figure 3 A magnified view of part A.

[0065] refer to Figure 3 and Figure 4The adjusting bolt 160 can be advanced or retracted in the vertical direction (e.g., the Z-axis direction) by rotation. The adjusting bolt 160 can be configured to move in the direction of compressing the first compression spring 151sp by rotation in one direction. Moreover, the adjusting bolt 160 can be configured to move in the direction of relaxing the first compression spring 151sp by rotation in the opposite direction.

[0066] Specifically, when the adjusting bolt 160 advances in the vertical direction (in other words, direction 1) by rotation, that is, when the adjusting bolt 160 is in... Figure 3 When the housing rises in the +Z direction, the housing protrusion 126, which contacts the adjusting bolt 160, receives an upward force, and the adjusting housing 120 rises upward. As a result, the distance G between the adjusting housing 120 and the support 110 increases, and the first compression spring 151sp can be compressed. Because the housing protrusion 126 is subjected to an upward force, the adjusting housing 120 can rotate clockwise by a predetermined angle relative to the axis of rotation.

[0067] Conversely, when the adjusting bolt 160 retracts in the vertical direction (in other words, direction 2) by rotation, that is, when the adjusting bolt 160 is in... Figure 3 When the housing protrusion 126 descends in the -Z direction, it receives a downward force through the first compression spring 151sp, and the adjusting housing 120 descends. As a result, the distance G between the adjusting housing 120 and the support 110 decreases, and the first compression spring 151sp can relax. Because the housing protrusion 126 receives a downward force, the adjusting housing 120 can rotate as a whole counterclockwise by a predetermined angle relative to the rotation axis CL.

[0068] Therefore, by adjusting the advancing and retracting of the adjusting bolt 160 in the vertical direction, the adjusting housing 120 can be rotated clockwise or counterclockwise by a predetermined angle. This allows adjustment of the horizontal position of the welding head 140.

[0069] The adjusting bolt 160 can be threaded onto the support nut portion 117, allowing the adjusting bolt 160 to advance or retract vertically by rotation. The support nut portion 117 can be part of the support 110. Figure 4 In the diagram, the support nut portion 117 is shown exposed to the outside, but the support nut portion 117 may be provided on the inner surface of the through hole through which the adjusting bolt 160 passes in the support 110.

[0070] (Second Implementation)

[0071] Figure 5 This is an exploded perspective view showing the main parts of an ultrasonic welding apparatus 100 according to another embodiment of the present disclosure. Figure 5 The implementation shown is basically the same as Figures 1 to 3 The embodiments shown are the same, except that they also include stops 171 and 173. Therefore, the following description will focus on these differences.

[0072] refer to Figure 5 The first stop 171 can be arranged adjacent to the first bolt 151.

[0073] In some embodiments, the first stop 171 can be connected to the support 110 by extending through one side of the adjustment housing 120. Furthermore, the first stop 171 can prevent the adjustment housing 120 from being lifted upwards. Figure 5 In the illustration, the first stop 171 is shown as comprising a bolt and a nut, but this disclosure is not limited thereto. The first stop 171 may comprise a bolt, or may employ other constructions used as stops in the art.

[0074] When welding is performed using the ultrasonic welding apparatus 100, the welding head 140 can apply a predetermined pressure to the workpiece. In response to this pressure, the welding head 140 and the adjustment housing 120 surrounding the welding head 140 can be subjected to an upward force, thereby allowing the adjustment housing 120 to be lifted from the support 110. A first stop 171 can be used to restrict the movement of the adjustment housing 120, preventing the welding head 140 and the adjustment housing 120 from being lifted from the support 110.

[0075] After fixing the welding head 140 to a horizontal position, the first stop 171 can be installed on the adjustment housing 120 and the support 110.

[0076] In some embodiments, a second stop 173 may also be provided adjacent to the second bolt 153.

[0077] The second stop 173 can be connected to the support 110 by passing through the adjustment housing 120 from the other side of the adjustment housing 120. Furthermore, the second stop 173 can prevent the adjustment housing 120 from being lifted upwards. Figure 5 In the illustration, the second stop 173 is shown as comprising a bolt and a nut, but this disclosure is not limited thereto. The second stop 173 may comprise a bolt, or may employ other constructions used as stops in the art.

[0078] The second stop 173 can perform the same action as the first stop 171. In other words, the second stop 173 can be used to restrict the movement of the adjustment housing 120, so that the welding head 140 and the adjustment housing 120 are not lifted from the support 110.

[0079] After fixing the welding head 140 to a horizontal position, the second stop 173 can be installed on the adjustment housing 120 and the support 110.

[0080] The ultrasonic welding device 100 described above can easily and accurately adjust the horizontal position of the welding head relative to the anvil, thereby significantly improving the welding quality.

[0081] As described above, although embodiments of the present disclosure have been described in detail, those skilled in the art will be able to implement the present disclosure in various modifications without departing from the spirit and scope of the present disclosure as defined in the appended claims. Therefore, further modifications to embodiments of the present disclosure will not depart from the technology of the present disclosure.

[0082] [Explanation of reference numerals in the attached figures]

[0083] 100: Ultrasonic welding equipment

[0084] 110: Support

[0085] 114: concave part

[0086] 116: Support protrusion

[0087] 120: Adjustment unit housing

[0088] 122: Upper shell

[0089] 124: Lower shell

[0090] 124h1: First through hole

[0091] 124h2: Second through hole

[0092] 126: Shell protrusion

[0093] 130: Vibration Generator

[0094] 131: Vibrator

[0095] 133: Amplifier

[0096] 140: Welding head

[0097] 151: First bolt

[0098] 151sp: First compression spring

[0099] 153: Second bolt

[0100] 153sp: Second compression spring

[0101] 160: Adjusting bolt

[0102] 180: Anvil

[0103] 181: Base of the anvil

[0104] 190: Ultrasonic stack

Claims

1. An ultrasonic welding apparatus, the ultrasonic welding apparatus comprising: Supports with recesses; An ultrasonic stack body is disposed on the support; as well as An adjustment housing surrounds the ultrasonic stack and is disposed within the recess. The support and the adjustment housing are configured such that the distance between the support and the adjustment housing can be adjusted on one side.

2. The ultrasonic welding apparatus according to claim 1, wherein, The adjusting housing includes a lower housing and an upper housing, and The lower housing and the upper housing are configured to cooperate with each other to surround the side surface of the ultrasonic stack.

3. The ultrasonic welding apparatus according to claim 2, wherein, The lower housing includes a lower surface that corresponds to the concave surface of the recess in the support.

4. The ultrasonic welding apparatus according to claim 2, wherein, The upper housing and the lower housing are fastened together by housing fastening bolts.

5. The ultrasonic welding apparatus according to claim 1, wherein, The adjustment housing is configured to rotate relative to the axis of rotation by adjusting the distance between the support and the adjustment housing.

6. The ultrasonic welding apparatus according to claim 5, wherein, The axis of rotation is substantially parallel to the extension direction of the ultrasonic stack.

7. The ultrasonic welding apparatus according to claim 1, wherein, The adjustment housing includes through holes respectively disposed on both sides of the ultrasonic stack body, and The ultrasonic welding device further includes: a first bolt, which is fastened to the support through a through hole provided in the adjustment housing on one side of the ultrasonic stack; and a second bolt, which is fastened to the support through a through hole provided in the adjustment housing on the other side of the ultrasonic stack.

8. The ultrasonic welding apparatus according to claim 7, wherein, A first compression spring is inserted between the head of the first bolt and the housing of the adjusting part, and a second compression spring is inserted between the head of the second bolt and the housing of the adjusting part.

9. The ultrasonic welding apparatus according to claim 8, wherein, The spring constants of the first compression spring and the second compression spring are different from each other.

10. The ultrasonic welding apparatus according to claim 9, wherein, The spring constant of the first compression spring is greater than the spring constant of the second compression spring.

11. The ultrasonic welding apparatus according to claim 8, further comprising an adjusting bolt, the adjusting bolt passing through the support and capable of contacting the adjusting housing.

12. The ultrasonic welding apparatus according to claim 11, wherein, The adjusting bolt is configured to advance in the direction of compressing the first compression spring by rotating on its own.

13. An ultrasonic welding apparatus, the ultrasonic welding apparatus comprising: Ultrasonic stack; An adjustment housing surrounds the ultrasonic stack and has a housing protrusion on one side; A support having a support protrusion corresponding to one side of the adjustment housing and configured to at least partially support the adjustment housing; as well as An adjusting bolt, configured to pass through the support protrusion and contact the housing protrusion. The adjusting bolt is configured to adjust the distance between the support protrusion and the housing protrusion.

14. The ultrasonic welding apparatus according to claim 13, wherein, The adjustment housing is configured to rotate by a predetermined angle relative to the axis of rotation by the forward movement of the adjustment bolt.

15. The ultrasonic welding apparatus according to claim 13, wherein, The ultrasonic stack includes a vibration generator and a welding head.

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