Infrared detector Dewar shell traceless spot welding device and method

Abstract

The invention provides an infrared detector Dewar shell traceless spot welding device and method, and relates to the technical field of Dewar, the infrared detector Dewar shell traceless spot welding device comprises a mounting frame, a driving assembly, a first electrode, a fixing seat, a moving assembly and a second electrode, and the driving assembly and the fixing seat are both mounted on the mounting frame; the first electrode is mounted on the mounting frame through the driving assembly; the moving assembly is mounted on the fixed seat through the guide mechanism, can move along the guide mechanism, and is used for mounting a Dewar shell to be subjected to spot welding; the second electrode is mounted in the inner cavity of the fixed seat, and the upper end of the second electrode extends into the inner cavity of the moving assembly; when spot welding is carried out on the Dewar shell, a current loop can be formed when the first electrode, the Dewar shell, the moving assembly and the second electrode abut against one another. The moving assembly is arranged between the Dewar shell and the second electrode, so that the second electrode is not in direct contact with the Dewar shell during spot welding, and damage of the second electrode to a plating layer of the Dewar shell in the spot welding process is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of Dewars, and particularly to a device and method for seamless spot welding of the housing of an infrared detector Dewar. Background Art

[0002] In the field of infrared detectors, as a carrier for packaging infrared chips, a micro-Dewar is mainly used to package the chips into the cavity inside the Dewar, and a vacuum pumping and exhausting device is used to extract the gas inside the Dewar cavity, so as to form a high-vacuum state inside the micro-Dewar to maintain the high reliability and long service life of the Dewar.

[0003] In order to obtain an excellent high-vacuum environment and extend the service life of a refrigerated infrared detector, a getter is generally installed inside the Dewar cavity to assist in maintaining the high vacuum degree inside the Dewar cavity. As a porous structure part, the getter can usually adsorb gas molecules by using the porous structure.

[0004] The process of installing the getter on the Dewar housing is generally a resistance welding process, i.e., a spot welding process. In the traditional welding process, since the spot welding electrodes will respectively contact the outer surface of the Dewar housing and the fixing bracket for fixing the getter inside, and contact discharge occurs during the welding process, pits-like weld spots formed after the contact discharge will be left on the outer wall of the Dewar housing. The process of forming the weld spots not only destroys the original coating structure of the Dewar housing, making the housing prone to rust and thus reducing the service life of the Dewar, but also because the weld spots have a certain depth on the outer surface of the housing, and the thickness of the housing itself generally does not exceed 1 mm. Therefore, during the process of welding to form the weld spots, solder joint cracks are also likely to be formed around the weld spots, greatly increasing the risk of airtight failure of the housing material. Therefore, the conventional spot welding process is extremely likely to cause a great risk to the airtightness of the Dewar housing, and at the same time seriously affects the appearance quality of the product. Therefore, a device and method for seamless spot welding of the housing of an infrared detector Dewar are proposed. Summary of the Invention

[0005] The present invention provides a device and method for seamless spot welding of the housing of an infrared detector Dewar, which are used to solve the problem that in the conventional spot welding process, weld spots will be formed on the surface of the Dewar housing, and solder joint cracks will be formed around the weld spots, thus easily leading to the airtight failure of the housing material.

[0006] The present invention provides a device for seamless spot welding of the housing of an infrared detector Dewar, comprising:

[0007] A mounting frame;

[0008] A driving assembly, the driving assembly is mounted on the mounting frame;

[0009] A first electrode, the first electrode is mounted on the mounting frame through the driving assembly;

[0010] Fixing base, the fixing base is installed on the mounting frame;

[0011] Moving component, the moving component is installed on the fixing base through a guiding mechanism, the moving component can move along the guiding mechanism, and the moving component is used to install the Dewar shell to be spot welded;

[0012] Second electrode, the second electrode is installed in the inner cavity of the fixing base, and the upper end of the second electrode extends into the inner cavity of the moving component;

[0013] Wherein, the first electrode and the second electrode are respectively connected to the positive and negative power supplies of an external spot welder. When spot welding the Dewar shell, the driving component drives the first electrode to move, and when the first electrode, the Dewar shell, the moving component and the second electrode are in mutual contact, a current loop can be formed.

[0014] In one embodiment, the moving component includes a connecting block and a positioning block. A moving groove is provided at the top of the positioning block, and the connecting block is installed in the moving groove. The connecting block is used to install the Dewar shell to be spot welded.

[0015] In one embodiment, a groove is provided at the bottom of the moving groove, and the upper end of the second electrode penetrates through the positioning block and extends into the groove.

[0016] In one embodiment, the connecting block includes a guiding groove, and the guiding groove is used to install the Dewar shell to be spot welded. The direction of the guiding groove is the same as the direction of the moving groove.

[0017] In one embodiment, a transition layer is provided on the side wall surface of the guiding groove.

[0018] In one embodiment, the connecting block further includes an avoidance groove. The setting direction of the avoidance groove is perpendicular to the setting direction of the guiding groove. The avoidance groove is used to accommodate the insulator on the Dewar shell during spot welding.

[0019] In one embodiment, the guiding mechanism includes multiple guiding columns, multiple guiding grooves and elastic members. The elastic members are sleeved on the second electrode, and the upper end of the elastic member abuts against the positioning block, and the lower end abuts against the fixing base. The lower parts of the multiple guiding columns are all installed on the fixing base, and the upper parts all extend into the guiding grooves. The multiple guiding grooves are all provided inside the positioning block.

[0020] In one embodiment, the mounting frame includes a base, a mounting plate and a support plate. The mounting plate is installed on the base through the support plate. The driving component is installed on the mounting plate, and the fixing base is installed on the base.

[0021] In one embodiment, the driving component includes a cylinder, a telescopic rod, and an adapter block. The cylinder is mounted on the mounting plate. The output end of the cylinder is connected to one end of the telescopic rod, and the other end of the telescopic rod is connected to the adapter block. The first electrode is mounted on the adapter block.

[0022] A method for seamless spot welding of a Dewar shell of an infrared detector includes the following steps:

[0023] Step 1: Install the first electrode and the second electrode, and align the center lines of the first electrode and the second electrode;

[0024] Step 2: Mount the moving component on the fixed seat, install the Dewar shell to be spot-welded in the guiding groove of the connecting block, and insert the first electrode into the interior of the Dewar shell;

[0025] Step 3: Move the first electrode until it abuts against the spot-welding position on the inner wall of the Dewar shell;

[0026] Step 4: Continue to move the first electrode until the bottom of the connecting block abuts against the second electrode, so that a continuous current path is formed among the first electrode, the Dewar shell, the connecting block, and the second electrode;

[0027] Step 5: Trigger the spot-welding switch to conduct discharge welding

[0028] Compared with the prior art, the advantages of the present invention are that a moving component is arranged between the Dewar shell and the second electrode, so that during spot welding, the second electrode does not directly contact the Dewar shell. The moving component not only ensures that a current path can be formed between the first electrode and the second electrode, but also avoids damage to the coating of the Dewar shell by the second electrode during the spot-welding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Hereinafter, the present invention will be described in more detail based on embodiments with reference to the drawings.

[0030] Figure 1 is an enlarged schematic view of the welding spot of conventional spot welding;

[0031] Figure 2 is a schematic structural view of the spot-welding device of the present invention;

[0032] Figure 3 is a schematic view of the positional relationship between the first electrode and the second electrode of the present invention;

[0033] Figure 4 is Figure 2 a schematic view of part A of

[0034] Figure 5Yes Figure 3 Schematic diagram of part B;

[0035] Figure 6 Cross-sectional view of the moving component and guiding mechanism of the present invention;

[0036] Figure 7 First schematic diagram of the connection block of the present invention;

[0037] Figure 8 Second schematic diagram of the connection block of the present invention;

[0038] Figure 9 Installation schematic diagram of the Dewar shell during spot welding;

[0039] Figure 10 Structural schematic diagram between the Dewar shell, moving component and fixed seat of the present invention;

[0040] Figure 11 Structural schematic diagram of the Dewar shell of the present invention;

[0041] Figure 12 Structural schematic diagram of the getter and getter support of the present invention;

[0042] Figure 13 Installation schematic diagram of the getter and Dewar shell of the present invention;

[0043] Figure 14 Process schematic diagram of the Dewar shell during spot welding of the present invention;

[0044] Figure 15 Yes Figure 9 Side view;

[0045] Figure 16 Schematic diagram of the first electrode of the present invention;

[0046] Reference numerals:

[0047] 1. Mounting frame; 101. Base; 102. Mounting plate; 103. Support plate; 2. Driving component; 201. Cylinder; 202. Telescopic rod; 203. Adapter block; 3. Moving component; 301. Connection block; 3011. Transition layer; 3012. Guide groove; 3013. Avoidance groove; 302. Positioning block; 3021. Moving groove; 3022. Groove; 4. First electrode; 5. Second electrode; 6. Fixed seat; 7. Guiding mechanism; 701. Guide post; 702. Guide groove; 703. Elastic member; 8. Getter; 9. Getter support; 10. Insulator; 11. Dewar shell. Detailed implementation manners

[0048] The present invention will be further described below in conjunction with the accompanying drawings.

[0049] During the installation spot welding process of the conventional Dewar shell 11 and the getter support 9, one electrode is directly in contact with the outer wall of the Dewar shell 11, and the other is placed inside the Dewar shell 11 and contacts the spot welding point between the getter support 9 and the inner wall of the Dewar shell 11. After spot welding, dot-shaped welding spots will be formed on the inner and outer surfaces of the Dewar shell 11 respectively, and the shape is like a pit, as Figure 1 shown. This welding spot will damage the original coating structure of the Dewar shell 11, making the Dewar shell 11 prone to rust and reducing the service life of the Dewar.

[0050] Please refer to Figure 2 、 Figure 3 and Figure 6 shown, the present invention provides a non-trace spot welding device for an infrared detector Dewar shell 11, including: a mounting frame 1, a driving component 2, a first electrode 4, a fixed seat 6, a moving component 3 and a second electrode 5. The driving component 2 is installed on the mounting frame 1; the first electrode 4 is installed on the mounting frame 1 through the driving component 2; the fixed seat 6 is installed on the mounting frame 1; the moving component 3 is installed on the fixed seat 6 through a guiding mechanism 7, and the moving component 3 can move along the guiding mechanism 7. The moving component 3 is used to install the Dewar shell 11 to be spot welded; the second electrode 5 is installed in the inner cavity of the fixed seat 6, and the upper end of the second electrode 5 extends into the inner cavity of the moving component 3.

[0051] Among them, the first electrode 4 and the second electrode 5 are respectively connected to the positive and negative power supplies of an external spot welder. When spot welding the Dewar shell 11, the driving component 2 drives the first electrode 4 to move, and when the first electrode 4, the Dewar shell 11, the moving component 3 and the second electrode 5 are in mutual contact, an electric current loop can be formed. The first electrode 4 and the second electrode 5 are kept centered and aligned during installation, aligning the center line of the first electrode 4 shown in Figure 16 with the axis of the second electrode 5, as shown in Figure 5 shown.

[0052] To better implement the present invention, referring to Figure 4 、 Figure 6 and Figure 10 shown, in one embodiment, the moving component 3 includes a connecting block 301 and a positioning block 302. The positioning block 302 is made of a non-conductive non-metallic material, and the connecting block 301 is made of a conductive material. A moving groove 3021 is provided at the top of the positioning block 302, and the connecting block 301 is installed in the moving groove 3021. The connecting block 301 is used to install the Dewar shell 11 to be spot welded. The connecting block 301 can drive the Dewar shell 11 to move along the moving groove 3021, so as to facilitate spot welding of different points on the Dewar shell 11. A groove 3022 is provided at the bottom of the moving groove 3021, and the upper end of the second electrode 5 penetrates through the positioning block 302 and extends into the groove 3022.

[0053] The direction of the moving groove 3021 is consistent with the length direction of the first electrode 4. When the connecting block 301 drives the Dewar housing 11 to move, the first electrode 4 can adjust its relative position with respect to the Dewar housing 11 along the axial direction of the Dewar housing 11, so that the first electrode 4 can perform spot welding at different positions in the axial direction of the Dewar housing 11, that is, the getter support 9 can be installed at multiple positions.

[0054] As Figure 7 and Figure 8 , the connecting block 301 includes a guiding groove 3012. The guiding groove 3012 is used to install the Dewar housing 11 to be spot welded. The direction of the guiding groove 3012 is consistent with the direction of the moving groove 3021. The guiding groove 3012 is used for current shunting. The current diffracts from the second electrode 5 to the bottom of the connecting block 301, then to the two side walls of the guiding groove 3012, and then conducts through the transition layer 3011 to the Dewar housing 11, avoiding the closest distance conduction and making the current more evenly distributed on the contact surface between the transition layer 3011 and the Dewar housing 11.

[0055] The two side walls of the guiding groove 3012 are arc-shaped, and the arc-shaped structures of the two side walls fit the outer wall of the Dewar housing 11, so that the Dewar housing 11 can be stably installed in the guiding groove 3012. The surface of the side wall of the guiding groove 3012 is provided with a transition layer 3011. The transition layer 3011 is a metal material with relatively soft hardness, such as a tin sheet or an indium sheet. The connecting block 301 and the transition layer 3011 are closely attached to each other to form a whole. And the surface of the side wall of the guiding groove 3012 is an arc surface. Therefore, after the transition layer 3011 is set, the transition layer 3011 can closely fit the surface of the Dewar housing 11, as Figure 10 shown. The transition layer 3011 is relatively soft. When the first electrode 4 moves downward, the first electrode 4 gradually exerts pressure on the inner surface of the Dewar housing 11 and drives the Dewar housing 11 to move downward, so that the Dewar housing 11 squeezes the transition layer 3011. The transition layer 3011 can finely adjust the surface condition to adapt to the inconsistent shape caused by the machining tolerance of the Dewar housing 11, so that a large-area good conductor contact surface can be formed between the Dewar housing 11 and the transition layer 3011, and its contact resistance is very small. During the spot welding process, this contact surface plays a role in conducting electricity.

[0056] The connecting block 301 further includes an avoidance groove 3013. The setting direction of the avoidance groove 3013 is perpendicular to the setting direction of the guiding groove 3012. When welding the Dewar housing 11 and the getter support 9, the brazing between the Dewar housing 11 and the insulator 10 has been completed, as Figure 11 and Figure 13, the avoidance groove 3013 is used to accommodate the insulator 10 on the Dewar housing 11 during spot welding, and ensure that the Dewar housing 11 can rotate around its own central axis in the guiding groove 3012, and the insulator 10 will not affect the rotation of the Dewar housing 11, so that the insulator 10 and the connecting block 301 do not interfere with each other.

[0057] To better implement this invention, refer to Figure 6 , in one embodiment, the guiding mechanism 7 includes a plurality of guiding columns 701, a plurality of guiding grooves 702 and an elastic member 703. The elastic member 703 is sleeved on the second electrode 5, and the upper end of the elastic member 703 abuts against the positioning block 302, and the lower end abuts against the fixed seat 6. The lower parts of the plurality of guiding columns 701 are all installed on the fixed seat 6, and the upper parts all extend into the guiding grooves 702, and the plurality of guiding grooves 702 are all arranged inside the positioning block 302. In this embodiment, there are two guiding columns 701, and they are symmetrically arranged on both sides of the second electrode 5. Correspondingly, there are also two guiding grooves 702, as Figure 14 shown, Figure 14 a shows the situation where the second electrode 5 is disconnected from the connecting block 301. At this time, the elastic member 703 is in the initial state. When the first electrode 4 continues to move downward under the action of the driving assembly 2, the first electrode 4 will downwardly press the connecting block 301, and the movement of the connecting block 301 will drive the positioning block 302 to move downward along the guiding column 701. At this time, the positioning block 302 and the fixed seat 6 squeeze the elastic member 703. While the positioning block 302 moves downward, the top end of the second electrode 5 gradually extends out of the groove 3022 until the top end of the second electrode 5 abuts against the bottom of the connecting block 301, as Figure 14 shown in b. At this time, the first electrode 4 and the second electrode 5 are energized by the spot welder, and a current loop is formed among the first electrode 4, the Dewar housing 11, the connecting block 301, and the second electrode 5 to realize the spot welding operation.

[0058] After the spot welding is completed, the power is cut off. The first electrode 4 moves upward under the drive of the driving assembly 2, and the elastic force of the elastic member 703 makes the positioning block 302 return to the initial position, so that the connecting block 301 is disconnected from the second electrode 5 and returns to the state shown in Figure 14 a again.

[0059] To better implement this invention, refer to Figure 2 and Figure 3 , in one embodiment, the mounting frame 1 includes a base 101, a mounting plate 102 and a support plate 103. The mounting plate 102 is mounted on the base 101 through the support plate 103. The driving assembly 2 is mounted on the mounting plate 102, and the fixed seat 6 is mounted on the base 101.

[0060] To better implement this invention, refer to Figure 3, in one embodiment, the driving assembly 2 includes a cylinder 201, a telescopic rod 202 and an adapter block 203. The cylinder 201 is mounted on the mounting plate 102. The output end of the cylinder 201 is connected to one end of the telescopic rod 202, and the other end of the telescopic rod 202 is connected to the adapter block 203. The first electrode 4 is mounted on the adapter block 203.

[0061] A pressure regulating valve capable of adjusting the air pressure is provided on the mounting frame 1, which can adjust the pressure of the compressed air source of the gas entering the cylinder 201 according to needs, and further adjust the pressure of the first electrode 4 pressing down to meet the welding requirements of Dewar shells 11 of different models.

[0062] A method for non - mark spot welding of an infrared detector Dewar shell 11 includes the following steps:

[0063] Step 1: Install the first electrode 4 and the second electrode 5, and align the center lines of the first electrode 4 and the second electrode 5.

[0064] Step 2: Install the moving assembly 3 on the fixed seat 6, install the Dewar shell 11 to be spot - welded in the guiding groove 3012 of the connecting block 301, extend the first electrode 4 into the interior of the Dewar shell 11, and after assembling the getter 8 and the getter support 9, place them into the interior of the Dewar shell 11, as Figure 12 and Figure 13 shown. Figure 12 a is a schematic structural diagram of the getter support 9, Figure 12 b is a schematic diagram of the getter 8, Figure 12 c is a schematic diagram after the getter 8 and the getter support 9 are assembled. Figure 13 is a schematic diagram after the getter 8 is installed inside the Dewar shell 11.

[0065] Step 3: Move the first electrode 4 until the first electrode 4 abuts against the spot - welding position on the inner wall of the Dewar shell 11, that is, make the first electrode 4 abut against the spot - welding position of the Dewar shell 11 and the getter support 9.

[0066] Step 4: Continue to move the first electrode 4 until the bottom of the connecting block 301 abuts against the second electrode 5, so that an electrically connected loop is formed among the first electrode 4, the Dewar shell 11, the connecting block 301 and the second electrode 5. When the driving assembly 2 drives the first electrode 4 to continue moving downward, the first electrode 4 will squeeze the Dewar shell 11, and then squeeze the connecting block 301 and the positioning block 302 in sequence, so that the connecting block 301 and the positioning block 302 move downward until the bottom of the connecting block 301 abuts against the second electrode 5 to achieve an electric current path.

[0067] Step 5: Trigger the spot - welding switch to perform discharge welding.

[0068] The moving component 3 in the spot welding device can be replaced according to Dewar shells 11 of different sizes to adapt to more spot welding work between the Dewar shells 11 and the getter 8.

[0069] Based on the above-mentioned infrared detector Dewar shell non-trace spot welding device, its working principle is as follows:

[0070] First, install the first electrode 4 and the second electrode 5, and perform centering processing on the first electrode 4 and the second electrode 5. Install the moving component 3 on the fixed seat 6. Install the Dewar shell 11 to be spot welded, which has been placed with the getter 8 and the getter support 9, in the guiding groove 3012 of the connecting block 301, and make the insulator 10 on the Dewar shell 11 placed in the avoidance groove 3013. When installing the Dewar, ensure that the first electrode 4 is placed inside the Dewar shell 11. By adjusting the position of the connecting block 301 on the moving groove 3021, the spot welding position of the first electrode 4 inside the Dewar shell 11 can be adjusted. After the position of the Dewar shell 11 is adjusted, the air cylinder 201 drives the telescopic rod 202 to extend, so that the adapter block 203 drives the first electrode 4 to move downward, and the welding point of the first electrode 4 and the getter support 9 comes into contact. As Figure 14 shown in a, the first electrode 4 continues to move downward and will squeeze the Dewar shell 11, the connecting block 301 and the positioning block 302. The positioning block 302 moves, so that the elastic member 703 is compressed, and the top end of the second electrode 5 abuts against the connecting block 301. As Figure 14 shown in b, after confirming that it is tightly pressed and accurately positioned, trigger the spot welding switch to perform discharge welding. The outer surface of the Dewar shell 11 abuts against the transition layer 3011, avoiding the situation where traditional welding spots are formed on the outer surface of the Dewar shell 11. After one welding point is completed, adjust the air pressure switch, so that the air cylinder 201 drives the telescopic rod 202 to retract. The elastic force of the elastic member 703 will drive the moving component 3 to move upward, the connecting block 301 and the second electrode 5 are disconnected, and move the connecting block 301 along the moving groove 3021, so as to adjust the contact position between the Dewar shell 11 and the first electrode 4. After the first electrode 4 comes into contact with the next welding point, repeat the above process to perform the next welding work.

[0071] The Dewar shell 11 can also rotate on the guiding groove 3012 to adjust the contact between the welding point of the Dewar shell 11 in the circumferential direction and the first electrode 4.

[0072] Although the present invention has been described with reference to the preferred embodiments, various improvements can be made to it and components therein can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present invention is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. An infrared detector Dewar shell seamless spot welding device, characterized in that, Comprising: Mounting bracket; Drive assembly, which is mounted on the mounting bracket; First electrode, which is mounted on the mounting bracket through the drive assembly; Fixed seat, which is mounted on the mounting bracket; Moving assembly, which is mounted on the fixed seat through a guiding mechanism, the moving assembly can move along the guiding mechanism, and the moving assembly is used to mount the Dewar shell to be spot-welded; Second electrode, which is mounted in the inner cavity of the fixed seat, and the upper end of the second electrode extends into the inner cavity of the moving assembly; Wherein, the first electrode and the second electrode are respectively connected to the positive and negative power supplies of an external spot welder. When spot-welding the Dewar shell, the drive assembly drives the first electrode to move, and when the first electrode, the Dewar shell, the moving assembly and the second electrode are in mutual contact, a current loop can be formed.

2. The non - trace spot welding device for the Dewar housing of an infrared detector according to claim 1, wherein, The moving assembly includes a connecting block and a positioning block. A moving groove is provided at the top of the positioning block, and the connecting block is mounted in the moving groove. The connecting block is used to mount the Dewar shell to be spot-welded.

3. The infrared detector Dewar housing seamless spot welding device according to claim 2, characterized in that, A groove is provided at the bottom of the moving groove, and the upper end of the second electrode penetrates through the positioning block and extends into the groove.

4. The infrared detector Dewar housing seam welding device according to claim 2, wherein, The connecting block includes a guiding groove, which is used to mount the Dewar shell to be spot-welded, and the direction of the guiding groove is the same as that of the moving groove.

5. The infrared detector Dewar housing seamless spot welding device according to claim 4, characterized in that, A transition layer is provided on the side wall surface of the guiding groove.

6. The infrared detector Dewar housing seamless spot welding device according to claim 4, characterized in that, The connecting block further includes an avoidance groove, and the setting direction of the avoidance groove is perpendicular to the setting direction of the guiding groove. The avoidance groove is used to accommodate the insulator on the Dewar shell during spot-welding.

7. The seamless spot welding device for the infrared detector Dewar housing according to claim 6, wherein The guiding mechanism includes multiple guiding columns, multiple guiding grooves and elastic members. The elastic members are sleeved on the second electrode, and the upper end of the elastic member abuts against the positioning block, and the lower end abuts against the fixed seat. The lower parts of the multiple guiding columns are all mounted on the fixed seat, and the upper parts all extend into the guiding grooves. The multiple guiding grooves are all provided inside the positioning block.

8. The infrared detector Dewar housing seamless spot welding device according to claim 1 or 7, characterized in that, The mounting bracket includes a base, a mounting plate and a support plate. The mounting plate is mounted on the base through the support plate. The drive assembly is mounted on the mounting plate, and the fixed seat is mounted on the base.

9. The infrared detector Dewar housing seamless spot welding device according to claim 8, characterized in that, The drive assembly includes a cylinder, a telescopic rod and an adapter block. The cylinder is mounted on the mounting plate. The output end of the cylinder is connected to one end of the telescopic rod, and the other end of the telescopic rod is connected to the adapter block. The first electrode is mounted on the adapter block.

10. A method for seamless spot welding of the Dewar housing of an infrared detector, using the spot welding device described in any one of claims 1-9, characterized in that, Including the following steps: Step 1: Mount the first electrode and the second electrode, and align the center lines of the first electrode and the second electrode; Step 2: Mount the moving assembly on the fixed seat, mount the Dewar shell to be spot-welded in the guiding groove of the connecting block, and extend the first electrode into the Dewar shell; Step 3: Move the first electrode until the first electrode abuts against the spot-welding position on the inner wall of the Dewar shell; Step 4: Continue to move the first electrode until the bottom of the connecting block abuts against the second electrode, so that the current among the first electrode, the Dewar housing, the connecting block and the second electrode forms a connected loop; Step 5: Trigger the spot welding switch to discharge and weld.

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