A welding and testing method for non-standard studs of aircraft thermal insulation parts

Abstract

The present invention discloses a welding and detection method for non-standard studs of aircraft thermal insulation parts, comprising the following steps: S1. placing a thermal insulation board on a lower mold, and placing an upper cover plate on the surface to be welded of the thermal insulation board; S2. installing the non-standard studs in a welding gun, and after the non-standard studs are installed, placing the end of the welding gun in the through hole of the upper cover plate, and welding the thermal insulation board and the non-standard studs; S3. after all non-standard studs are welded, removing the upper cover plate; S4. embedding bushings in the through holes of the upper cover plate, allowing the threaded portion of the non-standard studs to pass through the bushings, observing whether the threaded portion interferes with the bushing holes, and then judging whether the verticality of the non-standard studs meets the requirements. The present invention provides an upper cover plate for positioning welding of non-standard studs in the welding stage, thereby improving the positioning accuracy during stud welding; in the detection stage, the upper cover plate embedded with the bushing is used to check the verticality of any position of the external thread of the non-standard studs after welding, thereby realizing low-cost and high-efficiency verticality detection of non-standard studs on aircraft thermal insulation parts.

Description

Technical Field

[0001] The present invention relates to the technical field of stud welding, and more particularly to a welding and detection method for non-standard studs of aircraft thermal insulation components. Background Art

[0002] Stud welding is a welding method that uses a short-circuit arc to connect studs or other fasteners to sheet metal. It boasts minimal welding distortion, high welding efficiency, and simple operation, making it widely used in aerospace engines, automotive applications, and other fields. Stud welding includes capacitor discharge stud welding, long-cycle arc stud welding, and short-cycle arc stud welding. The key to stud welding technology is ensuring the strength and perpendicularity of the connection between the stud or fastener and the sheet metal.

[0003] Aircraft thermal insulation components are typically made of high-temperature alloys and consist of insulation panels and studs. These components are large in size, come in various shapes, and have a large number of studs. Studs are primarily used to bolt insulation panels to load-bearing structural components. Due to special structural requirements, the studs used in aircraft thermal insulation components cannot fully meet the stud dimensions for short-cycle stud welding specified in GB / T 902.4-2010, and are therefore non-standard studs. These non-standard studs have external threads on the top, a boss in the middle, and a polished rod at the bottom. See the attached instructions for details. Figure 1 shown.

[0004] Short-cycle arc stud welding has small welding deformation and is suitable for welding high-temperature alloys with diameters of Φ5 mm and above. Patent publication number CN108500428A discloses a short-cycle stud welding technology solution for standard high-temperature alloy studs and floating pads. The problem of large welding deformation of floating pads and low stud positioning accuracy is solved by using a robotic welding device. Furthermore, patent publication number CN204430533U discloses a self-guided anti-burn stud welding device. By adding a protective cover, guide column and level to the outside of the welding gun, the verticality of the stud is improved and the problem of injuries caused by welding spatter is avoided. However, the above short-cycle stud welding is no longer applicable to the connection of non-standard studs with a diameter of 8 mm made of high-temperature alloy to thermal insulation boards (flat plates or curved plates). The main problems are as follows:

[0005] 1) The stud clamping head of a conventional welding gun cannot stabilize non-standard studs. First, the external thread length of the non-standard stud is short, resulting in a small clamping area. Second, the upper end of the non-standard stud is light and the lower end is heavy, resulting in good vertical adjustment performance of the upper end of the non-standard stud and poor vertical adjustment performance of the lower end, which cannot meet the verticality requirements of the non-standard stud and the insulation board. In addition, the self-guiding stud welding device disclosed in patent CN204430533U cannot weld curved plate materials.

[0006] 2) The end of the commonly used short-cycle stud welding gun is composed of a copper cylinder. High-temperature alloy materials require more standardized welding parameters than other materials such as aluminum and stainless steel. Large-scale welding parameters cause the copper cylinder to be easily worn and deformed, resulting in welding spatter, reducing the strength of non-standard stud joints and forming invalid connections;

[0007] 3) The verticality of the external thread of non-standard studs at any position has an assembly relationship. There is no efficient inspection method and it is impossible to predict the next component connection situation. Summary of the Invention

[0008] In order to solve the problems of poor clamping and positioning, poor verticality, low connection strength, and low efficiency of post-weld position detection in the existing short-cycle arc stud welding for welding non-standard studs with a diameter of 8 mm on aircraft to thermal insulation panels, a welding and detection method for non-standard studs of aircraft thermal insulation components was proposed.

[0009] In order to achieve the above-mentioned object of the invention, the technical solution of the present invention is as follows:

[0010] The present invention provides a welding and detection method for non-standard studs of aircraft thermal insulation parts, which mainly includes the following steps:

[0011] Step S1. Place the heat insulation board on the supporting tooling, and place the upper cover of the supporting tooling on the surface to be welded of the heat insulation board;

[0012] Step S2. Install the non-standard stud in the welding gun. After the non-standard stud is installed, place the end of the welding gun in the through hole of the upper cover plate, connect the ground clamp, and weld the insulation board and the non-standard stud;

[0013] Step S3. After all non-standard studs are welded, remove the upper cover plate, check the weld nodules and slag at the bottom of all non-standard studs, and remove the weld nodules and slag according to the weld quality requirements;

[0014] Step S4. Insert a bushing into the through hole of the upper cover, fix the Z-direction bracket to the lower mold of the matching tooling, fix the upper cover to the Z-direction bracket, and pass the threaded portion of the non-standard stud through the through hole of the bushing; if the threaded portion of the non-standard stud does not interfere with the through hole of the bushing, it means that the verticality meets the requirements, otherwise it does not meet the requirements.

[0015] Preferably, in the present invention, the welding gun tip is provided with a stainless steel cylinder and a stud clamping head, and the stud clamping head is located in the cavity of the stainless steel cylinder.

[0016] Preferably, in the present invention, the matching tooling includes a lower die and an upper cover plate, and the size of the through hole on the upper cover plate matches the outer diameter of the stainless steel cylinder on the welding gun.

[0017] Preferably, in the present invention, a movable block is further provided between the stainless steel cylinder and the stud clamping head, one end of the movable block is connected to the inner wall of the stainless steel cylinder via a spring, and the other end abuts against the stud clamping head.

[0018] Preferably, in the present invention, a clamping ring assembly is further provided in the cavity of the stainless steel cylinder, and the clamping ring assembly includes a steel wire, a first hinge and a second hinge, one end of the first hinge is connected to the inner wall of the stainless steel cylinder, and the other end is rotatably connected to the second hinge through a hinge pin, one end of the steel wire is connected to the button on the welding gun, and the other end is connected to the second hinge, the button drives the steel wire to move up and down, and the steel wire drives the second hinge to rotate around the hinge pin.

[0019] Preferably, in the present invention, when the second hinge is rotated to the horizontal position, the second hinge clamps the polished rod portion of the non-standard stud.

[0020] Preferably, in the present invention, the Z-direction bracket includes a column, the column is provided with an arc-shaped groove along the circumference, and the upper cover is provided with an arc-shaped groove adapted to the arc-shaped groove, and the arc-shaped groove is clamped in the arc-shaped groove.

[0021] Preferably, in the present invention, the grounding clamp is symmetrically clamped on the matching tooling.

[0022] Preferably, in the present invention, when the non-standard stud is welded to the heat insulation board, the welding current is 800 A-850 A and the welding time is 30 ms.

[0023] Preferably, in the present invention, step S1 further comprises cleaning the areas to be welded of the heat insulation board and the areas to be welded of the non-standard studs respectively and thoroughly by mechanical grinding.

[0024] Beneficial effects of the present invention:

[0025] 1. The welding gun of the present invention is provided with a stainless steel cylinder and used in combination with supporting tooling, which not only realizes the welding of high-temperature alloys with large standard parameters, reduces the welding gun consumption rate and spatter probability, and improves the strength of non-standard stud connection joints, but also is suitable for stud welding of flat or curved surface plates to be welded.

[0026] 2. The movable block on the welding gun of the present invention is used to adjust the verticality of the upper end of the non-standard stud, and the clamping ring assembly on the welding gun is used to hold the lower end of the non-standard stud and adjust the verticality of the lower end. The combination of the two avoids the eccentricity problem caused by the non-standard stud being heavy on the top and light on the bottom, and realizes that the non-standard stud is parallel to the stainless steel cylinder. The through hole of the upper cover plate is used to hold the stainless steel cylinder, so that the stainless steel cylinder is perpendicular to the insulation board. The step-by-step adjustment ensures the verticality of the non-standard stud and the insulation board.

[0027] 3. The present invention provides an upper cover plate for positioning welding of non-standard studs during the welding stage, thereby improving the positioning accuracy of stud welding; during the inspection stage, an upper cover plate with an embedded bushing is provided for checking the verticality of the external thread of the non-standard studs at any position after welding, thereby realizing low-cost and high-efficiency verticality inspection of non-standard studs on aircraft thermal insulation parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The foregoing and following detailed description of the present invention will become more apparent when read in conjunction with the following drawings, in which:

[0029] Figure 1 This is a schematic diagram of an aircraft thermal insulation component according to the present invention;

[0030] Figure 2 It is a partial schematic diagram of the short cycle stud welding gun of the present invention;

[0031] Figure 3 for Figure 2 A-direction enlarged view;

[0032] Figure 4 This is a closed schematic diagram of the snap ring assembly of the present invention;

[0033] Figure 5 This is a partial schematic diagram of the position and size of the non-standard stud external thread on the upper cover plate of the present invention;

[0034] Figure 6 The figure is a schematic diagram of the supporting tooling of the present invention suitable for stud welding of curved surface plates to be welded.

[0035] In the picture:

[0036] 1. Heat insulation board; 2. Non-standard stud; 3. Upper cover; 4. Stud clamp; 5. Movable block; 6. Spring; 7. Lower die; 8. Stainless steel cylinder; 9. Grounding clamp; 11. Snap ring assembly; 12. Z-direction bracket; 13. Bushing; 2-1. Non-standard stud boss; 2-2. Non-standard stud external thread; 2-3. Non-standard stud polished rod; 11-1. Steel wire; 11-2. Hinge pin; 11-3. First hinge; 11-4. Second hinge; 12-1. Arc groove. DETAILED DESCRIPTION

[0037] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions for achieving the purposes of the present invention will be further illustrated below through specific embodiments. It should be noted that the technical solutions claimed for protection by the present invention include but are not limited to the following embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work should fall within the scope of protection of the present invention.

[0038] Short-cycle arc stud welding has small welding deformation and is suitable for welding high-temperature alloys with a diameter of Φ5 mm and above. However, it is not suitable for welding non-standard studs with a diameter of 8 mm made of high-temperature alloy to insulation boards (flat or curved plates). The main problems are as follows:

[0039] 1) The stud clamping head of a conventional welding gun cannot stabilize non-standard studs. First, the external thread length of the non-standard stud is short, resulting in a small clamping area. Second, the upper end of the non-standard stud is light and the lower end is heavy. As a result, the vertical adjustment performance of the upper end of the non-standard stud is good, while the vertical adjustment performance of the lower end is poor, which cannot meet the verticality requirements of the non-standard stud and the insulation board. In addition, the self-guiding stud welding device disclosed in patent CN204430533U cannot weld curved plate materials.

[0040] 2) The end of the commonly used short-cycle stud welding gun is composed of a copper cylinder. High-temperature alloy materials require more standardized welding parameters than other materials such as aluminum and stainless steel. Large-scale welding parameters cause the copper cylinder to be easily worn and deformed, resulting in welding spatter, reducing the strength of non-standard stud joints and forming invalid connections;

[0041] 3) The verticality of the external thread of non-standard studs at any position has an assembly relationship. There is no efficient inspection method, and it is impossible to predict the next component connection status.

[0042] Based on this, an embodiment of the present invention proposes a method for welding and detecting non-standard studs of aircraft thermal insulation parts. The present invention adds a stainless steel cylinder to the welding gun, and then uses special matching tooling to cooperate with it. It not only realizes the welding of high-temperature alloys with large standard parameters, reduces the welding gun consumption rate and spatter probability, and improves the strength of non-standard stud connection joints, but also is suitable for stud welding of flat or curved plates to be welded, and can also quickly detect the verticality of non-standard studs after welding.

[0043] Example 1

[0044] This embodiment discloses a method for welding and detecting non-standard studs of a planar thermal insulation component, which is characterized by comprising the following detailed steps:

[0045] a. The heat insulation board 1 is bent and the non-standard stud 2 is machined.

[0046] In this embodiment, the machined non-standard stud 2 has a base diameter of 8 mm and a specific taper angle of 167°±1°. The external threaded portion of the non-standard stud 2 has a diameter w1 of MJ6 and a height h3, with 8 mm ≤ h3 < 13 mm. The polished rod portion of the non-standard stud 2 has a height h1, with h1 > h3. The non-standard stud 2 is entirely made of GH5188 high-temperature alloy.

[0047] b. Use mechanical grinding to clean the area to be welded of the insulation board 1 and the non-standard studs 2. After cleaning, clean the area to be welded with industrial alcohol, and then install the insulation board 1 on the matching tooling. Specifically, the insulation board 1 is placed on the lower mold 7 of the matching tooling. The lower mold 7 is a copper platform with a platform size of 600mm×600mm. Then, the upper cover plate 3 in the matching tooling is placed on the surface to be welded of the insulation board 1.

[0048] c. Before welding, first install the non-standard stud 2 in the welding gun. After the non-standard stud 2 is installed, place the end of the welding gun in the through hole of the upper cover plate 3, then connect the grounding clamp 9, and weld the insulation board 1 and the non-standard stud 2.

[0049] In this embodiment, it should be noted that the number of through holes provided on the upper cover plate 3 is dozens or even hundreds, and the welding of multiple non-standard studs 2 can be completed by clamping the heat insulation board once.

[0050] In this embodiment, the grounding clamp 9 is symmetrically clamped on the lower die 7 of the matching tooling to prevent magnetic blow from occurring during the welding process.

[0051] d. After all non-standard studs 2 are welded, first remove the upper cover plate 3 above the thermal insulation board 1, then check the weld nodules and slag at the bottom of all non-standard studs 2, and remove the weld nodules and slag according to the weld quality requirements.

[0052] e. Install the bushing 13 in the through hole of the upper cover plate 3, and use the Z-direction bracket 12 in conjunction with the upper cover plate 3 to detect the verticality of any position of the external thread of the welded non-standard stud 2.

[0053] In this embodiment, when testing the verticality of the external thread of the non-standard stud, the Z-direction bracket 12 is fixed to the lower mold 7, the upper cover plate 3 is fixed to the Z-direction bracket 12, and the threaded portion of the non-standard stud 2 passes through the through hole of the bushing 13; if the non-standard stud 2 does not interfere with the through hole of the bushing 13, it means that the verticality meets the requirement; otherwise, it does not meet the requirement.

[0054] Furthermore, in order to ensure the verticality of the welding of the non-standard stud 2, the present invention has made improvements and adjustments to the structure of the welding gun, adding a stainless steel cylinder 8 and a stud clamping head 4 at the end of the welding gun. On the one hand, the stainless steel cylinder 8 is in surface contact with the heat insulation board 1 to ensure the verticality during welding, and on the other hand, the stud clamping head 4 is convenient for clamping and straightening the non-standard stud 2 to prevent it from tilting, further ensuring the verticality after welding. Specifically, refer to the attached manual Figure 2-4The end of the welding gun is fixedly provided with a stainless steel cylinder 8 and a stud clamping head 4. The stud clamping head 4 is located in the cavity of the stainless steel cylinder 8, and the stainless steel cylinder 8 completely covers the stud clamping head 4. The stud clamping head 4 is usually connected to the end of the welding gun by a thread. In the present invention, the stud clamping head 4 can also be designed as a hollow cylinder structure, using its own cavity to clamp the upper threaded portion of the non-standard stud 2.

[0055] Furthermore, in order to prevent the stud clamping head 4 from shaking during welding, thereby causing the non-standard stud 2 to shake together and affecting the verticality of the welding, in this example, a movable block 5 is further provided in the cavity of the stainless steel cylinder 8. The movable block 5 is located between the stainless steel cylinder 8 and the stud clamping head 4. One end of the movable block 5 is connected to the inner wall of the stainless steel cylinder 8 through a spring 6, and the other end abuts against the outer wall of the stud clamping head 4. When the non-standard stud 2 is installed, the movable block 5 contracts using the elastic force of the spring 6, clamping the stud clamping head 4 so that the axis of the non-standard stud external thread portion is coaxial with the axis of the stud clamping head 4 itself. The movable blocks 5 are evenly distributed around the stud clamping head 4, and the cross-sectional shape of the side abutting against the stud clamping head 4 is adapted to the shape of the stud clamping head 4.

[0056] In this embodiment, the thickness of the upper cover plate 3 used is 5 mm, and the basic size of the through hole set thereon is the same as the outer diameter of the stainless steel cylinder 8. The preferred through hole processing tolerance requirement is ±0.05 mm, so as to ensure the verticality of the stainless steel cylinder 8 and the insulation board 1.

[0057] Furthermore, the stud clamping head 4 ensures the verticality of the threaded part of the non-standard stud. For the verticality of the polished rod part of the non-standard stud, this embodiment adds a snap ring assembly 11 in the cavity of the stainless steel cylinder 8. The snap ring assembly 11 is composed of a steel wire 11-1, a hinge pin 11-2, a first hinge 11-3 and a second hinge 11-4, wherein the hinge pin 11-2, the first hinge 11-3 and the second hinge 11-4 constitute a hinge structure, one end of the first hinge 11-3 is embedded in the stainless steel cylinder 8 and is fixedly connected to the inner wall of the stainless steel cylinder 8, and the other end is connected to the second hinge 11-4 through the hinge pin 11-2; the steel wire 11-1 is controlled by the button on the welding gun, one end of the steel wire 11-1 is connected to the button on the welding gun, and the other end is connected to the second hinge 11-4. When the button is pressed, the steel wire 11-1 relaxes downward, the hinge structure opens and closes, and the second hinge 11-4 hangs freely, rotating around the hinge pin 11-2 to a vertical position, and the entire snap ring assembly 11 is in an open position. When the button is not pressed, the steel wire 11-1 moves upward, driving the hinge structure to engage, and the second hinge 11-4 rotates around the hinge pin 11-2 to a horizontal position, and the snap ring assembly 11 is in a closed position. The second hinge 11-4 clamps the polished rod portion of the non-standard stud 2. The snap ring assembly 1 is in an open position before and during installation of the non-standard stud external thread, and is in a closed position after installation. In the closed position, the second hinge 11-4 clamps the polished rod portion of the non-standard stud 2, so that the lower end and upper end of the non-standard stud 2 are coaxial.

[0058] In this embodiment, the clamping ring assembly 11 is evenly distributed perpendicularly to the stainless steel cylinder 8 and is staggered at 60 degrees with the movable block 5 in the cavity.

[0059] The verticality of the threaded portion at the upper end of the non-standard stud 2 is adjusted by the movable block 5, and the smooth rod portion at the lower end is clamped by the clamping ring assembly 11 to ensure verticality. The stainless steel cylinder 8 is in surface contact with the area to be welded of the thermal insulation 1, thereby ensuring the overall verticality during welding. The present invention precisely adjusts the verticality of the non-standard stud 2 and the thermal insulation board 1 through the step-by-step coordination of the matching tooling, the stainless steel cylinder 8, the movable block 5, and the clamping ring assembly 11, thereby achieving effective welding of the non-standard stud 2 and improving the verticality and connection strength of the joint after welding. Preferably, when the non-standard stud 2 is welded to the thermal insulation board 1, the welding current is 800 A-850 A, and the welding time is 30 ms. After a high-temperature tensile test at 650°C, the joint strength of the high-temperature alloy stud welded by this method can reach 644 MPa.

[0060] In this embodiment, in step e, the verticality of any position of the external thread of the non-standard stud 2 welded on the insulation board 1 is detected using an upper cover plate 3 embedded with a bushing 13, and the diameter of the bushing 13 embedded in the through hole of the upper cover plate 3 is w3, w3>w1 and w3=w1+0.2 mm. During post-weld inspection, the bushing 13 is first inserted into the through hole of the upper cover plate 3, and then the upper cover plate 3 is mounted on the Z-direction bracket 12. The Z-direction bracket 12 is composed of at least two columns, which are connected to the pin holes on the lower die 7 by pins. The columns are provided with arc-shaped grooves along the circumference, and there are at least three grooves distributed along the height direction of the columns. The height of each of the grooves is set to 2 mm, and the position intervals that can be detected by the three grooves are (h1, h1+5), (h1+4, h1+9), and (h1+8, h1+13). Furthermore, the position interval that can detect the non-standard stud external thread is (h1, h1+13), thereby realizing the verticality detection of any position of the non-standard stud external thread. The upper cover plate 3 is provided with an arc-shaped groove that adapts to the arc-shaped groove of the column. When detecting the verticality, the arc-shaped groove of the upper cover plate 3 is inserted into the arc-shaped groove on the column, and the arc-shaped groove supports the upper cover plate. The entire Z-direction bracket 12 secures the upper cover plate 3 while ensuring the horizontality of the bushing 13 on the upper cover plate 3. If the external thread of the non-standard stud 2 can pass through the through-hole of the bushing 13 embedded in the upper cover plate 3 without interfering, the verticality of the external thread of the non-standard stud 2 meets the requirements. If it cannot pass through the bushing hole or interferes with the bushing hole, the verticality of the external thread of the non-standard stud 2 does not meet the requirements. Whether the external thread of the non-standard stud 2 interferes with the bushing hole can be determined by visual observation or using a feeler gauge.

[0061] Example 2

[0062] This embodiment discloses a method for welding and detecting non-standard studs of curved thermal insulation parts. The difference between this embodiment and Example 1 is that the structure of the supporting tooling used is different. For curved thermal insulation parts, the lower mold 7 and the upper cover plate 3 of the supporting tooling are processed according to the curvature of the curved surface plate to be welded. The upper cover plate 3 is processed with a through hole in the area corresponding to the non-standard stud position. Preferably, the center line of the through hole is perpendicular to the curved surface plate to be welded.

[0063] Furthermore, the curved thermal insulation member is hydraulically formed.

[0064] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification or equivalent change made to the above embodiment based on the technical essence of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A welding and testing method for non-standard studs of aircraft thermal insulation parts, characterized in that: The welding and detection method comprises the following steps: Step S1. Place the heat insulation board on the supporting tooling, and place the upper cover of the supporting tooling on the surface to be welded of the heat insulation board; Step S2. Install the non-standard stud in the welding gun. After the non-standard stud is installed, place the end of the welding gun in the through hole of the upper cover plate, connect the ground clamp, and weld the insulation board and the non-standard stud; Step S3. After all non-standard studs are welded, remove the upper cover plate, check the weld nodules and slag at the bottom of all non-standard studs, and remove the weld nodules and slag according to the weld quality requirements; Step S4. Insert a bushing into the through-hole of the upper cover plate, secure the Z-direction bracket to the lower die of the matching tooling, secure the upper cover plate to the Z-direction bracket, and pass the threaded portion of the non-standard stud through the through-hole of the bushing. If the threaded portion of the non-standard stud does not interfere with the through-hole of the bushing, the verticality meets the requirements; otherwise, it fails to meet the requirements. The welding gun end is provided with a stainless steel cylinder and a stud clamping head, and the stud clamping head is located in the cavity of the stainless steel cylinder; The matching tooling includes a lower die and an upper cover plate, and the size of the through hole on the upper cover plate matches the outer diameter of the stainless steel cylinder on the welding gun; A movable block is further provided between the stainless steel cylinder and the stud clamping head, one end of the movable block is connected to the inner wall of the stainless steel cylinder through a spring, and the other end abuts against the stud clamping head; A clamping ring assembly is further provided in the cavity of the stainless steel cylinder, and the clamping ring assembly includes a steel wire, a first hinge, and a second hinge. One end of the first hinge is connected to the inner wall of the stainless steel cylinder, and the other end is rotatably connected to the second hinge via a hinge pin. One end of the steel wire is connected to a button on the welding gun, and the other end is connected to the second hinge. The button drives the steel wire to move up and down, and the steel wire drives the second hinge to rotate around the hinge pin. When the second hinge is rotated to the horizontal position, the second hinge clamps the bare rod portion of the non-standard stud; The Z-direction bracket includes a column, and the column is provided with an arc-shaped groove along the circumference. The upper cover is provided with an arc-shaped clamping groove adapted to the arc-shaped groove, and the arc-shaped clamping groove is clamped in the arc-shaped groove.

2. The method for welding and detecting non-standard studs of aircraft thermal insulation parts according to claim 1, characterized in that: The grounding clamp is symmetrically clamped on the matching tooling.

3. The welding and testing method for non-standard studs of aircraft thermal insulation parts according to claim 1, characterized in that: When welding non-standard studs to thermal insulation boards, the welding current is 800 A-850 A and the welding time is 30 ms.

4. The welding and testing method for non-standard studs of aircraft thermal insulation parts according to claim 1, characterized in that: The step S1 further includes cleaning the areas to be welded of the heat insulation board and the areas to be welded of the non-standard studs respectively and thoroughly by mechanical grinding.

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