Micro TO device welding method

Abstract

The invention discloses a micro TO device welding method, a tube socket and a tube cap are positioned and welded through a welding device, the welding device comprises an upper electrode, a lower electrode and a limiting cylinder, the lower electrode is provided with a first through hole, the upper electrode is provided with a second through hole, the first through hole is coaxially communicated with the second through hole, the tube socket comprises a socket body and a pin, and the pin is arranged in the socket body. The inner diameter of the second through hole is larger than the outer diameter of the main body and smaller than the outer diameter of the flange; the micro TO device is assembled in the mode that the tube base is arranged on the lower portion and the tube cap is arranged on the upper portion, the upper electrode and the lower electrode jointly press the assembled micro TO device, the limiting cylinder is arranged to limit and fix the upper electrode and the lower electrode so that the upper electrode, the lower electrode, the tube base and the tube cap can form a stable whole, and therefore welding is convenient and fast. The tube seat and the tube cap can be better protected; and meanwhile, the upper electrode for pressing the pipe cap is also provided with an arc chamfer matched with the arc angle of the pipe cap, so that the pipe cap is further protected from being damaged in the welding process.

Description

Technical Field

[0001] The invention relates to the technical field of TO device welding, and in particular to a micro TO device welding method. Background Art

[0002] Micro TO (Transistor Outline) gold-plated devices refer to small semiconductor devices that use TO (transistor outline) packaging. They are characterized by small size and stable performance and are often used in high-frequency or high-reliability electronic circuits. In the energy storage welding process of micro TO gold-plated devices, welding quality is crucial to the performance and reliability of the device.

[0003] At present, the process uses a specific device and method to achieve resistance welding of the tube cap and the tube seat. Specifically, the tube cap is placed on the lower electrode without chamfering, and the lower electrode is fixed on the lower base of the equipment. The tube seat is placed upside down on the tube cap, and the upper electrode is fixed on the upper base of the equipment. Through the descending action of the cylinder, the upper electrode is closely in contact with the tube seat, and under a certain pressure, the energy storage welding equipment is instantly discharged to achieve the sealing welding of the tube cap and the tube seat.

[0004] However, the welding method in the prior art has defects. Since the pins of the device socket are long, they are prone to be skewed during the initial processing, resulting in serious eccentricity between the pins and the inner hole of the upper electrode. During the lowering process of the upper electrode, this eccentricity can easily cause the pins to be bent or even flattened, affecting the welding quality and the reliability of the device. Summary of the invention

[0005] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is: to provide a micro TO device welding method to solve the problem of pins being bent and flattened due to pin skew during welding, improve welding quality, reduce device scrap rate, and improve production efficiency.

[0006] In order to solve the above technical problems, a technical solution adopted by the present invention is: providing a micro TO device welding method, positioning welding a tube seat and a tube cap by a welding device, the welding device comprising an upper electrode, a lower electrode and a limiting cylinder for limiting and fixing the upper electrode and the lower electrode, the lower electrode is provided with a first through hole for limiting the tube seat, the upper electrode is provided with a second through hole for limiting the tube cap, the first through hole and the second through hole can be coaxially connected, the tube seat comprises a seat body and a pin coaxially arranged with the seat body, the inner diameter of the first through hole is larger than the outer diameter of the pin and smaller than the outer diameter of the seat body, the tube cap has a main body and a flange coaxially arranged with the main body, the inner diameter of the second through hole is larger than the outer diameter of the main body and smaller than the outer diameter of the flange, the method comprises the following steps:

[0007] S100: placing the lower electrode in the limiting cylinder;

[0008] S200: inserting the tube holder into the limiting cylinder with the pin facing downward, so that the pin is inserted into the first through hole, and the holder is limited to the upper end surface of the lower electrode;

[0009] S300: Covering the pipe cap on the base with the flange facing downward;

[0010] S400: placing the upper electrode in the limiting cylinder, and accommodating the seat body in the second through hole, and pressing the seat body and the flange tightly together with the upper electrode and the lower electrode;

[0011] S500: Place the assembled pipe seat, pipe cap and welding device on the energy storage welding equipment for welding.

[0012] Furthermore, the limiting cylinder includes a cylinder wall and a limiting cavity formed in the cylinder wall, and the outer diameter of the upper electrode and the outer diameter of the lower electrode both match the inner diameter of the limiting cavity so as to be able to be limited therein.

[0013] Further, the limiting cavity passes through the limiting cylinder, and the limiting cavity includes a first cavity and a second cavity, the first cavity passes through the upper end surface of the limiting cylinder, the second cavity is located at the lower end of the first cavity and is connected to the first cavity, the inner diameter of the second cavity is smaller than the inner diameter of the first cavity, and a first step surface is formed between the second cavity and the first cavity, the lower electrode has a guide section matching the first cavity and a limiting section matching the second cavity, the outer diameter of the limiting section is smaller than the outer diameter of the guide section, and a second step surface is formed between the guide section;

[0014] In step S100, when the lower electrode is placed in the limiting cylinder, the first step surface contacts the second step surface to limit the lower electrode in the axial direction.

[0015] Furthermore, a circular arc angle with a natural transition is formed between the main body and the flange, and a circular arc chamfer matching the circular arc angle is provided at the intersection of the lower end surface of the upper electrode and the second through hole;

[0016] In step S400, when the upper electrode presses the tube cap onto the tube seat, the arc chamfer matches and fits with the arc angle.

[0017] Furthermore, the sum of the height of the upper electrode and the height of the lower electrode is greater than the height of the limiting cylinder;

[0018] In step S400, when the upper electrode and the lower electrode are extremely located in the limiting cylinder, the upper end of the upper electrode extends upward from the first cavity, and the lower end of the limiting segment extends downward from the second cavity, so that the upper electrode and the lower electrode are connected to the energy storage welding equipment.

[0019] Furthermore, the upper end surface of the limiting cylinder is concavely provided with a slot, the slot is communicated with the first cavity, and the outer peripheral wall of the upper electrode is convexly provided with a block matching the slot, and the block can slide vertically in the slot;

[0020] In step S400, the upper electrode is placed in the limiting cylinder in a state where the clamping block is aligned with the clamping slot so that the upper electrode is placed more stably and does not rotate.

[0021] Furthermore, the limiting cylinder is also provided with a limiting assembly, and the limiting assembly is used to limit the card block in the card slot;

[0022] In step S400, the limiting assembly cooperates with the clamping block and the clamping slot to axially limit the upper electrode.

[0023] Furthermore, the limiting assembly includes a limiting plate, and a horizontal groove is formed on the side wall of the card slot at a position corresponding to the upper end surface of the card block, and the limiting plate slides horizontally in the groove;

[0024] In step S400, after the upper electrode is assembled in the limiting cylinder, the limiting plate is rotated to move from the groove into the clamping slot to axially limit the clamping block.

[0025] Furthermore, the card slots and the card blocks have several groups, and the card slots and the card blocks of the several groups are evenly distributed in a circle with the axis of the limiting cavity as the center, and the limiting plates also have several corresponding to the several groups of card slots and the card blocks.

[0026] Furthermore, the limit assembly further comprises a rotating ring, a plurality of the limit plates are evenly spaced and arranged on the inner peripheral wall of the rotating ring, an annular groove communicating with the plurality of the grooves is provided in the position of the limit cylinder corresponding to the groove, and the rotating ring is rotatably mounted in the annular groove;

[0027] In step S400, the rotating ring is rotated to simultaneously drive a plurality of the limiting plates to rotate, thereby axially limiting each of the clamping blocks.

[0028] The micro TO device welding method of the present invention has at least the following beneficial effects: the micro TO device is assembled in a manner that the tube seat is at the bottom and the tube cap is at the top, so that the upper electrode and the lower electrode jointly press the assembled micro TO device, and a limiting cylinder is provided to limit and fix the upper electrode and the lower electrode so that the upper electrode, the lower electrode, the tube seat and the tube cap form a stable whole, so that welding can better protect the tube seat and the tube cap; at the same time, the upper electrode used for pressing the tube cap is also provided with an arc chamfer matching the arc angle of the tube cap, so as to further protect the tube cap from being damaged during the welding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0030] Figure 1 It is a structural schematic diagram of a TO device in Embodiment 1 of the micro TO device welding method of the present invention;

[0031] Figure 2 It is a structural schematic diagram of Embodiment 1 of the micro TO device welding method of the present invention;

[0032] Figure 3 It is a cross-sectional structural schematic diagram of Embodiment 1 of the micro TO device welding method of the present invention;

[0033] Figure 4 It is a schematic structural diagram of the upper electrode in the first embodiment of the micro TO device welding method of the present invention;

[0034] Figure 5 It is a schematic structural diagram of a limiting cylinder in Embodiment 1 of the micro TO device welding method of the present invention;

[0035] Figure 6 It is a structural schematic diagram of Embodiment 2 of the micro TO device welding method of the present invention;

[0036] Figure 7 It is a schematic diagram of the structure of the upper electrode and the clamping block in the second embodiment of the micro TO device welding method of the present invention;

[0037] Figure 8 It is a structural schematic diagram of a limiting cylinder in Embodiment 2 of the micro TO device welding method of the present invention;

[0038] Fig. 9 It is a schematic diagram of the cross-sectional structure of the limiting cylinder in the second embodiment of the micro TO device welding method of the present invention.

[0039] The meanings of the symbols in the accompanying drawings are:

[0040] Micro TO device 1, tube cap 11, main body 111, flange 112, arc angle 113, tube seat 12, seat body 121, pin 122;

[0041] Welding device 2, upper electrode 21, second through hole 211, arc chamfer 212, clamping block 213, lower electrode 22, guide section 221, limiting section 222, second step surface 223, first through hole 224, limiting cylinder 23, first cavity 231, second cavity 232, first step surface 233, clamping groove 234;

[0042] The limiting assembly 3 , the limiting piece 31 , the rotating ring 32 , the annular groove 33 , the groove 34 , the connecting groove 35 , the shifting rod 36 , the shifting piece 37 , and the rubber strip 38 . DETAILED DESCRIPTION

[0043] The present invention will be further described below in conjunction with the accompanying drawings.

[0044] Embodiment 1:

[0045] In order to explain the structure of the present invention more clearly, the micro TO device 1 in this embodiment is first explained. Figure 1 . The micro TO device 1 in this embodiment includes a coaxially assembled tube cap 11 and a tube seat 12. The tube seat 12 includes a seat body 121 and a pin 122 coaxially arranged with the seat body 121. From the appearance, the seat body 121 is composed of a coaxial first section and a second section, and the outer diameter of the first section is smaller than the outer diameter of the second section. The pin 122 is fixedly arranged on the side of the second section away from the first section. The pin 122 is slender and the outer diameter of the pin 122 is smaller than the outer diameter of the first section. The tube cap 11 includes a main body 111 and a flange 112 coaxially arranged with the main body 111. The main body 111 is a hollow cylinder and one end is capped with an arc-shaped glass lens. The flange 112 is arranged on the other end of the main body 111 away from the glass lens, and is formed by the outer periphery of the main body 111 extending radially outward, so the outer diameter of the flange 112 is larger than the outer diameter of the main body 111. An annular arc angle 113 with a natural transition is formed between the main body 111 and the flange 112. The inner diameter of the main body 111 matches the inner diameter of the first subsection so that the first subsection can be accommodated therein. The outer diameter of the flange 112 matches the second subsection so that it can be pressed together with the second subsection.

[0046] The micro TO device welding method of the present invention aims to position and weld the tube base 12 and the tube cap 11 of the micro TO device 1 by a welding device 2. Figure 2 and Figure 3The welding device 2 includes an upper electrode 21, a lower electrode 22, and a limiting cylinder 23 for limiting and fixing the upper electrode 21 and the lower electrode 22. In order to cooperate with the limiting cylinder 23, the lower electrode 22 includes a coaxial guide section 221 and a limiting section 222. The limiting section 222 is located at the lower end of the guide section 221, and the outer diameter of the limiting section 222 is smaller than the outer diameter of the guide section 221, and a second step surface 223 is formed between the limiting section 222 and the guide section 221. The lower electrode 22 is provided with a first through hole 224 for limiting the tube seat 12. The inner diameter of the first through hole 224 is larger than the outer diameter of the pin 122 and smaller than the outer diameter of the second section. In this way, the first through hole 224 can accommodate the pin 122 and keep the seat body 121 on the upper surface of the lower electrode 22. It should be emphasized that the inner diameter of the first through hole 224 can be as large as possible under the premise of being smaller than the outer diameter of the second section, because during the processing of the tube seat 12, the central axis of the pin 122 may deviate from the central axis of the seat body 121 by a certain angle, which does not affect the subsequent use of the tube seat 12. When the first through hole 224 is as large as possible, the deviation between the pin 122 and the seat body 121 that can be accommodated by the first through hole 224 is also greater. That is, even if the deviation between the pin 122 and the seat body 121 is large, when the pin 122 is accommodated in the first through hole 224, the lower end surface of the tube seat 12 can still fit with the upper end surface of the lower electrode 22, and does not affect the subsequent welding operation.

[0047] The outer diameter of the upper electrode 21 is the same as that of the guide section 221, and the upper electrode 21 is provided with a second through hole 211 which is used to limit the tube cap 11, and the second through hole 211 can be coaxially connected with the first through hole 224. The inner diameter of the second through hole 211 is larger than the outer diameter of the main body 111 and smaller than the outer diameter of the flange 112, so that the second through hole 211 can accommodate the main body 111, and at the same time, the flange 112 can be pressed onto the tube seat 12 and the lower electrode 22 through the lower end face of the upper electrode 21. It should be emphasized that the intersection of the lower end face of the upper electrode 21 and the second through hole 211 is provided with an arc chamfer 212 which is adapted to the arc angle 113, please refer to Figure 4 When the lower end surface of the upper electrode 21 presses the flange 112 onto the tube seat 12 and the lower electrode 22, the arc chamfer 212 is pressed onto the arc corner 113 to avoid scratches on the tube seat 12 at the sharp intersection, and also to avoid excessive charge accumulation and excessive current at the sharp intersection, which may cause the gold-plated layer of the tube cap 11 to adhere to the upper electrode 21 during the welding process.

[0048] The limiting cylinder 23 includes a cylinder wall and a limiting cavity formed in the cylinder wall. The limiting cavity is coaxial with the limiting cylinder 23 and penetrates the limiting cylinder 23 axially, and the limiting cavity includes a first cavity 231 and a second cavity 232 that are coaxially opened. The first cavity 231 penetrates the upper end surface of the limiting cylinder 23, and the inner diameter of the first cavity 231 matches the outer diameter of the upper electrode 21 and the guide section 221 so as to accommodate both the upper electrode 21 and the lower electrode 22. The second cavity 232 is located at the lower end of the first cavity 231 and is connected to the first cavity 231. The inner diameter of the second cavity 232 is smaller than the inner diameter of the first cavity 231 and forms a first step surface 233 between the second cavity 231 and the first cavity 231. Please refer to Figure 5 The outer diameter of the limiting section 222 matches the inner diameter of the second cavity 232. When the lower electrode 22 is placed in the limiting cylinder 23, the first step surface 233 contacts the second step surface 223 to limit the lower electrode 22 in the axial direction. The sum of the height of the upper electrode 21 and the height of the lower electrode 22 is greater than the height of the limiting cylinder 23.

[0049] The micro TO device welding method of the present invention performs positioning welding on the tube seat 12 and the tube cap 11 of the micro TO device 1 by using the above-mentioned welding device 2, and comprises the following steps:

[0050] S100: placing the lower electrode 22 in the limiting cylinder 23;

[0051] S200: inserting the tube seat 12 into the limiting cylinder 23 with the pin 122 facing downward, so that the pin 122 extends into the first through hole 224, and the seat body 121 is limited to the upper end surface of the lower electrode 22;

[0052] S300: Covering the pipe cap 11 on the base body 121 with the flange 112 facing downward;

[0053] S400: placing the upper electrode 21 in the limiting cylinder 23, and accommodating the seat body 121 in the second through hole 211, and the upper electrode 21 and the lower electrode 22 press the seat body 121 and the flange 112 tightly together;

[0054] S500: placing the assembled tube base 12, tube cap 11 and welding device 2 on the energy storage welding equipment for welding.

[0055] The working method of the embodiment 1 of the micro TO device welding method of the present invention is as follows: first, the lower electrode 22 is placed in the limiting cylinder 23. When placing, the lower electrode 22 is placed in the limiting cavity with the limiting section 222 facing downward until the first step surface 233 contacts the second step surface 223, at which time, the lower end of the lower electrode 22 extends out of the limiting cylinder 23. Then, the tube seat 12 is extended into the limiting cylinder 23 with the pin 122 facing downward, so that the pin 122 extends into the first through hole 224, and the lower end surface of the seat body 121 is fitted with the upper end surface of the lower electrode 22, so that the seat body 121 is limited to the upper end surface of the lower electrode 22. It should be emphasized that the seat body 121 needs to be coaxial with the first through hole 224 when placed so as not to affect the subsequent pressing and welding. Then, the tube cap 11 is covered on the seat body 121 with the flange 112 facing downward. The upper electrode 21 is placed in the limiting cylinder 23, and the seat body 121 is accommodated in the second through hole 211. The upper electrode 21 and the lower electrode 22 press the seat body 121 and the flange 112 tightly together. Finally, the assembled tube seat 12, tube cap 11 and welding device 2 are placed on the energy storage welding equipment for welding.

[0056] Based on the above embodiments, the micro TO device welding method of the present invention has the following beneficial effects: the micro TO device 1 is assembled in a manner that the tube seat 12 is at the bottom and the tube cap 11 is at the top, so that the upper electrode 21 and the lower electrode 22 jointly press the assembled micro TO device 1, and a limiting cylinder 23 is provided to limit and fix the upper electrode 21 and the lower electrode 22 so that the upper electrode 21, the lower electrode 22, the tube seat 12 and the tube cap 11 form a stable whole. Such welding can better protect the tube seat 12 and the tube cap 11; at the same time, the upper electrode 21 used for pressing the tube cap 11 is also provided with an arc chamfer 212 matching the arc angle 113 of the tube cap 11, which further protects the tube cap 11 from being damaged during the welding process.

[0057] Embodiment 2:

[0058] This embodiment is based on the above embodiment 1, and adds axial limit to the upper electrode 21. Figure 6 and Figure 7, the upper end surface of the limiting cylinder 23 is concavely provided with a slot 234, and there are a plurality of the slots 234, which are evenly spaced and arranged in a circular shape with the axis of the limiting cylinder 23 as a circle. Each of the slots 234 is in an arc shape that matches the limiting cylinder 23, and each of the slots 234 also penetrates the inner wall of the limiting cylinder 23 to communicate with the first cavity 231. The outer peripheral wall of the upper electrode 21 is provided with a block 213 corresponding to the plurality of slots 234 at the position corresponding to the plurality of slots 234, and the block 213 can slide vertically in the slot 234. When the block 213 slides to the bottom of the slot 234, the upper electrode 21 and the lower electrode 22 press the tube seat 12 and the tube cap 11 tightly. With the cooperation of the plurality of the clamping blocks 213 and the plurality of the clamping grooves 234 , the upper electrode 21 will not rotate in the limiting cylinder 23 , thereby not causing friction damage to the tube cap 11 .

[0059] Please refer to Figure 6 , Figure 8 and Fig. 9 The limiting cylinder 23 is also provided with a limiting assembly 3, which is used to cooperate with the plurality of the clamping blocks 213 and the plurality of the clamping slots 234 to realize the axial limiting of the upper electrode 21. The limiting assembly 3 includes a limiting piece 31 and a rotating ring 32. The limiting cylinder 23 is provided with an annular groove 33, which is located at a position corresponding to the outer periphery of the plurality of the clamping slots 234 in the limiting cylinder 23, and the annular groove 33 is connected with the plurality of the clamping slots 234, specifically, through the outer periphery of the clamping slots 234. The rotating ring 32 matches the annular groove 33 to be accommodated therein, and the rotating ring 32 can rotate around its own axis in the annular groove 33. A groove 34 is also provided on one circumferential side of each of the clamping slots 234, and the groove 34 is connected with the corresponding clamping slot 234, and the outer periphery of the groove 34 is connected with the annular groove 33, and the groove 34 is in an arc shape matching the clamping slot 234. The limiting pieces 31 have a plurality of corresponding grooves 34, each of which is in an arc shape matching the grooves 34, and each of which is fixed to the inner peripheral wall of the rotating ring 32. When the rotating ring 32 is installed in the annular groove 33, the limiting pieces 31 are located in the grooves 34 in a corresponding manner, and when the rotating ring 32 rotates, the limiting pieces 31 move from the grooves 34 to the corresponding slots 234 together. It should be emphasized that the slots 34 are opened at the side wall of the slots 234 corresponding to the upper end surface of the block 213, that is, when the limiting piece 31 moves into the slots 234, the lower end surface of the limiting piece 31 contacts the upper end surface of the block 213 to limit the position.

[0060] A connecting groove 35 is also provided on the limiting cylinder 23 at a position corresponding to the outer circumference of the annular groove 33. The connecting groove 35 is provided along the radial direction of the limiting cylinder 23 and extends along the circumferential direction of the limiting cylinder 23. One radial end of the connecting groove 35 is connected to the annular groove 33, and the other radial end of the connecting groove 35 penetrates the outer circumferential wall of the limiting cylinder 23 outward. A lever 36 is slidably provided in the connecting groove 35. The lever 36 is provided along the radial direction of the limiting cylinder 23. One end of the lever 36 is fixedly connected to the outer circumferential wall of the rotating ring 32, and the other end extends outward. The lever 36 can rotate in the connecting groove 35 with the axis of the limiting cylinder 23 as the center (slide along this trajectory in the connecting groove 35). A paddle 37 is provided at one end of the lever 36 away from the rotating ring 32. The paddle 37 is in an arc shape matching the limiting cylinder 23 and the outer diameter of the paddle 37 matches the outer diameter of the limiting cylinder 23, so that the device as a whole is more beautiful and compact, and the risk of damage caused by the extension of the components is reduced. It should be emphasized that both the lever 36 and the paddle 37 are connected to the connecting groove 35 with damping sliding. A plurality of vertical rubber strips 38 are provided on the side of the paddle 37 exposed outside the limiting cylinder 23 to increase the friction force on the surface of the paddle 37, so that the user can easily move the paddle 37.

[0061] The working method of the second embodiment of the micro TO device welding method of the present invention is as follows: in step S400, when the upper electrode 21 is placed in the limiting cylinder 23, the plurality of the clamping blocks 213 are aligned one by one with the plurality of the clamping slots 234, and when the upper electrode 21 is placed, the plurality of the clamping blocks 213 also slide into the plurality of the clamping slots 234. Then the limiting assembly 3 is operated to further fix the upper electrode 21, and the steps are as follows: the paddle 37 is moved, so that the paddle 37 drives the rotating ring 32 to rotate through the paddle rod 36, so that the rotating ring 32 drives the plurality of the limiting pieces 31 to rotate, and when the limiting piece 31 moves from the groove 34 to the clamping slot 234, the clamping block 213 is limited in the clamping slot 234, so that the upper electrode 21 is limited.

[0062] Based on the above embodiments, the micro TO device welding method of the present invention has the following beneficial effects: the card slot, the card block and the limit assembly can cooperate with each other to limit the upper electrode circumferentially and axially. The circumferential limit can prevent the upper electrode from rotating and causing friction damage to the tube shell or even the tube seat. The axial limit makes the device as a whole more stable when assembled, which is not only convenient for movement but also for storage.

Claims

1. A micro TO device welding method, wherein a tube seat and a tube cap are positioned and welded by a welding device, characterized in that: The welding device comprises an upper electrode, a lower electrode and a limiting cylinder for fixing the upper electrode and the lower electrode, the lower electrode is provided with a first through hole for limiting the tube seat, the upper electrode is provided with a second through hole for limiting the tube cap, the first through hole and the second through hole can be coaxially connected, the tube seat comprises a seat body and a pin coaxially arranged with the seat body, the inner diameter of the first through hole is larger than the outer diameter of the pin and smaller than the outer diameter of the seat body, the tube cap has a main body and a flange coaxially arranged with the main body, the inner diameter of the second through hole is larger than the outer diameter of the main body and smaller than the outer diameter of the flange, and the method comprises the following steps: S100: placing the lower electrode in the limiting cylinder; S200: inserting the tube holder into the limiting cylinder with the pin facing downward, so that the pin is inserted into the first through hole, and the holder is limited to the upper end surface of the lower electrode; S300: Covering the pipe cap on the base with the flange facing downward; S400: placing the upper electrode in the limiting cylinder, and accommodating the seat body in the second through hole, and pressing the seat body and the flange tightly together with the upper electrode and the lower electrode; S500: Place the assembled pipe seat, pipe cap and welding device on the energy storage welding equipment for welding.

2. The micro TO device welding method according to claim 1, characterized in that: The limiting cylinder comprises a cylinder wall and a limiting cavity formed in the cylinder wall. The outer diameter of the upper electrode and the outer diameter of the lower electrode both match the inner diameter of the limiting cavity so as to be limited therein.

3. The micro TO device welding method according to claim 2, characterized in that: The limiting cavity passes through the limiting cylinder, and the limiting cavity includes a first cavity and a second cavity, the first cavity passes through the upper end surface of the limiting cylinder, the second cavity is located at the lower end of the first cavity and is connected to the first cavity, the inner diameter of the second cavity is smaller than the inner diameter of the first cavity, and a first step surface is formed between the second cavity and the first cavity, the lower electrode has a guide section matching the first cavity and a limiting section matching the second cavity, the outer diameter of the limiting section is smaller than the outer diameter of the guide section, and a second step surface is formed between the guide section; In step S100, when the lower electrode is placed in the limiting cylinder, the first step surface contacts the second step surface to limit the lower electrode in the axial direction.

4. The micro TO device welding method according to claim 1, characterized in that: A circular arc angle with a natural transition is formed between the main body and the flange, and a circular arc chamfer matching the circular arc angle is provided at the intersection of the lower end surface of the upper electrode and the second through hole; In step S400, when the upper electrode presses the tube cap onto the tube seat, the arc chamfer matches and fits with the arc angle.

5. The micro TO device welding method according to claim 3, characterized in that: The sum of the height of the upper electrode and the height of the lower electrode is greater than the height of the limiting cylinder; In step S400, when the upper electrode and the lower electrode are extremely located in the limiting cylinder, the upper end of the upper electrode extends upward from the first cavity, and the lower end of the limiting segment extends downward from the second cavity, so that the upper electrode and the lower electrode are connected to the energy storage welding equipment.

6. The micro TO device welding method according to claim 3, characterized in that: The upper end surface of the limiting cylinder is concavely provided with a slot, the slot is communicated with the first cavity, and the outer peripheral wall of the upper electrode is convexly provided with a block matching the slot, and the block can slide vertically in the slot; In step S400, the upper electrode is placed in the limiting cylinder in a state where the clamping block is aligned with the clamping slot so that the upper electrode is placed more stably and does not rotate.

7. The micro TO device welding method according to claim 6, characterized in that: The limiting cylinder is also provided with a limiting assembly, and the limiting assembly is used to limit the clamping block in the clamping slot; In step S400, the limiting assembly cooperates with the clamping block and the clamping slot to axially limit the upper electrode.

8. The micro TO device welding method according to claim 7, characterized in that: The limiting assembly includes a limiting piece, and a horizontal groove is formed on the side wall of the card slot at a position corresponding to the upper end surface of the card block, and the limiting piece slides horizontally in the groove; In step S400, after the upper electrode is assembled in the limiting cylinder, the limiting plate is rotated to move from the groove into the clamping slot to axially limit the clamping block.

9. The micro TO device welding method according to claim 8, characterized in that: The slots and blocks are provided in a plurality of groups, and the slots and blocks are evenly distributed in a circle with the axis of the limiting cavity as the center. The limiting plates also have a plurality of slots and blocks corresponding to the plurality of groups.

10. The micro TO device welding method according to claim 9, characterized in that: The limiting assembly further comprises a rotating ring, a plurality of the limiting plates are evenly spaced and arranged on the inner peripheral wall of the rotating ring, an annular groove communicating with the plurality of the grooves is provided in the limiting cylinder at a position corresponding to the groove, and the rotating ring is rotatably mounted in the annular groove; In step S400, the rotating ring is rotated to simultaneously drive a plurality of the limiting plates to rotate, thereby axially limiting each of the clamping blocks.

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