A welding gas shield

Abstract

The present application relates to the technical field of welding, in particular to a kind of welding gas protection tool, including tool body;Tool body is equipped with the passageway for placing the workpiece to be welded;The circumference of the passageway is equipped with the protection gas circulation groove being communicated with passageway;Tool body is also equipped with at least two gas holes being communicated with the protection gas circulation groove.The end face of the blind hole can be used as the positioning end face of the workpiece to be welded in the present application, so that the weld of the workpiece to be welded can be just in the position where the protection gas circulation groove is located.Protective gas is introduced into tool body from one of the gas holes, and the protective gas is discharged from the other gas hole, so as to circulate in the protection gas circulation groove, that is, a relatively sufficient protective gas circulation space can be formed for the weld of the workpiece to be welded, so that the weld of the workpiece to be welded is always under the cover of protective gas, avoiding other components from contacting the weld of the workpiece to be welded, so as to affect the quality of the weld.

Description

Technical Field

[0001] This invention relates to the field of welding technology, and specifically to a welding gas shielding fixture. Background Technology

[0002] Zirconium and its alloys possess excellent nuclear properties and corrosion resistance, making them widely used in nuclear power engineering and increasingly entering the chemical industry. However, zirconium and its alloys are easily oxidized at high temperatures in the welding zone, requiring inert gas protection, thus posing a significant welding challenge. While there are successful cases of welding zirconium alloy pipes using tungsten inert gas (TIG) welding both domestically and internationally, for welding small-diameter zirconium and zirconium alloy pipes with wall thicknesses ≤1.5mm, the large deformation caused by TIG welding necessitates the use of electron beam welding to control deformation and ensure weld joint quality. Although electron beam welding results in less deformation and higher weld joint quality in thin-walled zirconium alloys, it suffers from limited equipment availability, high equipment costs, long vacuuming times during welding, and low production efficiency.

[0003] Laser welding and electron beam welding both belong to high-energy beam welding, and the quality of the welded joints is almost identical. In recent years, the market share of laser welding equipment has been increasing, and the cost of laser welding equipment is lower than that of electron beam welding equipment. Laser welding technology is also becoming increasingly mature; however, there are no cases of using laser welding to weld thin-walled zirconium alloy tubes. The reason for this is the poor protection effect of laser welding on the zirconium alloy weld seam. When laser welding thin-walled zirconium alloy tubes, traditional gas shielding mechanisms are ineffective in protecting the weld seam, resulting in poor weld joint quality. Summary of the Invention

[0004] In view of this, the present invention provides a welding gas protection fixture, which is designed to provide better gas protection when welding small-diameter / thin-walled pipes made of special materials such as zirconium and zirconium alloy pipes that are susceptible to oxidation.

[0005] To solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0006] A welding gas shielding fixture includes a fixture body; the fixture body has a channel for placing a workpiece to be welded; the channel has a shielding gas circulation groove communicating with the channel in its circumferential direction; the fixture body also has at least two gas holes communicating with the shielding gas circulation groove.

[0007] In some embodiments, the channel is a blind hole that does not penetrate the entire tooling body.

[0008] In some embodiments, the tooling body is provided with a cap whose position can be adjusted along the length direction of the blind hole, corresponding to the extension direction of the blind hole axis.

[0009] In some embodiments, the end cap and the tooling body are connected by threads.

[0010] In some embodiments, the end cap is interference-fitted with the tooling body.

[0011] In some embodiments, the end cap away from the blind hole has a clamping portion.

[0012] In some embodiments, the channel is a through hole that runs through the entire tooling body.

[0013] In some embodiments, the tooling body includes a first body portion and a second body portion that are detachably connected; the first body portion and the second body portion are symmetrically arranged about the plane containing the center line of the through hole.

[0014] In some embodiments, at least one of the contact surfaces of the first body portion and the second body portion is provided with a plurality of slots, and the other is provided with a matching pin corresponding to the slot.

[0015] In some embodiments, the number of pores is even and they are symmetrically distributed along the circumference of the tooling body.

[0016] In summary, compared with the prior art, the present invention has the following advantages and beneficial effects: The end face of the blind hole can be used as the positioning end face of the workpiece to be welded, so that the weld seam of the workpiece to be welded is exactly in the position of the protective gas circulation tank. Protective gas is introduced into the tooling body through one of the gas holes, and the protective gas will be discharged from the other gas hole, thus circulating within the protective gas circulation tank. This creates a relatively sufficient protective gas circulation space for the weld seam of the workpiece to be welded, ensuring that the weld seam is always under the protective gas, preventing other components from contacting the weld seam and thus affecting the weld quality. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the tooling described in Embodiment 1 of the present invention.

[0018] Figure 2 This is a cross-sectional view of the tooling described in Embodiment 1 of the present invention.

[0019] Figure 3 This is a three-dimensional structural diagram of the tooling described in Embodiment 2 of the present invention.

[0020] Figure 4 This is a cross-sectional view of the tooling described in Embodiment 2 of the present invention.

[0021] Figure 5 This is an exploded structural diagram of the tooling described in Embodiment 2 of the present invention.

[0022] Figure 6 This is a three-dimensional structural diagram of the tooling described in Embodiment 3 of the present invention.

[0023] Figure 7 This is a cross-sectional view of the tooling described in Embodiment 3 of the present invention.

[0024] Figure 8 This is an exploded structural diagram of the tooling described in Embodiment 3 of the present invention.

[0025] Figure 9 This is a schematic diagram of the structure of the first body part in the tooling described in Embodiment 3 of the present invention.

[0026] Figure 10 This is a schematic diagram of the structure of the second body part in the tooling described in Embodiment 3 of the present invention.

[0027] The labels in the figure are as follows: tooling body 11, internal thread 110, first body part 111, second body part 112, end cap 12, external thread 120, clamping part 121, air hole 2, protective gas circulation groove 3, channel 4, slot 51, and pin 52. Detailed Implementation

[0028] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to specific embodiments.

[0029] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0030] In the description of this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," "exceeding," etc. are understood to exclude the stated number, while "above," "below," "within," etc. are understood to include the stated number. If terms such as "first," "second," etc., are used only to distinguish technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0031] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0032] Example 1

[0033] like Figure 1 and Figure 2 As shown in the figure, a welding gas shielding fixture according to an embodiment of this application includes a fixture body 11, on which a channel 4 for placing the workpiece to be welded is provided. A shielding gas circulation groove 3 communicating with the channel 4 is provided circumferentially. The fixture body 11 also has at least two gas holes 2 communicating with the shielding gas circulation groove 3.

[0034] In this embodiment, the tooling body 11 is cylindrical, and the channel 4 is located within the tooling body 11 along its length. The channel 4 is a blind hole that does not penetrate the entire tooling body 11. In this case, the end face of the blind hole can serve as the positioning end face of the workpiece to be welded, ensuring that the weld seam is positioned within the protective gas circulation tank 3 after one end of the workpiece abuts against the end face of the blind hole. Protective gas is introduced into the tooling body 11 through one of the gas holes 2, and the protective gas is discharged through the other gas hole 2, thus circulating within the protective gas circulation tank 3. This creates a sufficient protective gas circulation space for the weld seam of the workpiece to be welded, ensuring that the weld seam is always enveloped by the protective gas, preventing other gases (such as oxygen) from contacting the weld seam, thereby guaranteeing weld quality.

[0035] Research and practice have shown that when the cross-sectional width of the channel 4 is 0.02 mm (inclusive) to 0.3 mm (inclusive) larger than the cross-sectional width of the workpiece to be welded, the protective gas is less likely to overflow from the channel 4, or only a small amount of protective gas overflows from the channel 4, but it can still ensure that there is sufficient protective gas circulating in the protective gas circulation tank 3. At the same time, the fact that the cross-sectional width of the channel 4 is larger than the cross-sectional width of the workpiece to be welded also facilitates the entry, exit, and rotation of the workpiece to be welded.

[0036] At least two vents 2 need to be provided to ensure air inlet and outlet, thereby ensuring that the protective gas can circulate within the protective gas circulation tank 3. The outlet vent 2 can be used as the lower beam welding window for laser welding. In this case, the workpiece to be welded needs to be rotated to achieve complete welding of the entire weld seam.

[0037] Alternatively, the number of vents 2 can be set to an even number, such as four or six, and symmetrically distributed around the circumference of the tooling body 11. In this way, when tack welding the weld seam of the workpiece to be welded, the weld seam can be tack welded and positioned first in one vent 2, then in another vent 2 on the opposite side, and so on, tack welding can be performed sequentially on other symmetrical vents 2. This results in symmetrical weld spots, more uniform stress on the weld seam, less deformation, and easier assurance of the quality of the subsequent complete weld. Furthermore, the other vents 2 not used as lower beam welding windows can also be used as observation windows to dynamically observe the welding process from all angles.

[0038] Example 2

[0039] To facilitate adaptation to workpieces of different specifications, such as Figures 3-5 As shown, this embodiment of the application further adds an adjustable end cap 12 to the tooling body 11 based on Embodiment 1. In this case, the tooling body 11 has a through hole, and the end cap 12 can be adjusted in position along the length of the through hole. For example, an internal thread 110 can be machined at one end of the through hole, and a matching external thread 120 can be machined on the end cap 12, or an interference fit can be used between the end cap 12 and the tooling body 11.

[0040] For workpieces whose weld position is not fixed, the depth of the through hole can be adjusted by rotating or pushing / pulling the end cap 12 to form a blind hole as in Example 1. This ensures that the weld can always be in the position of the protective gas circulation groove 3 after one end of the workpiece is in contact with the end face of the blind hole, so that the laser welding beam can be accurately aligned with the weld from the gas hole 2.

[0041] To facilitate the turning of the end cap 12, this embodiment of the application may also provide a clamping part 121 at the end of the end cap 12 away from the blind hole, which is conducive to clamping with a wrench or turning by hand.

[0042] Example 3

[0043] For long workpieces to be welded, even after adjusting the depth of channel 4, the weld seam still cannot be aligned with the shielding gas circulation tank 3 after one end of the workpiece abuts against the end of the blind hole. In this case, it is necessary to... Figure 7Based on Embodiment 1, channel 4 is configured as a through hole penetrating the entire fixture body 11. This allows the workpiece to pass through the fixture body 11, ensuring the weld seam is positioned within the protective gas circulation tank 3. As described in Embodiment 1, when the cross-sectional width of channel 4 is 0.02mm to 0.3mm larger than the cross-sectional width of the workpiece to be welded, the protective gas is less likely to overflow from channel 4, or only a small amount overflows, but still ensures sufficient protective gas circulation within the protective gas circulation tank 3. Therefore, the structure described in Embodiment 3 still provides good gas protection for the weld seam of the workpiece to be welded.

[0044] Considering that when the workpiece to be welded is long, it is not very convenient to move the fixture body 11 to the weld after inserting it into the fixture body 11 from one end of the workpiece. Therefore, as Figure 8 As shown in the embodiment of this application, the tooling body 11 can also be designed as a detachably connected first body part 111 and second body part 112, with the first body part 111 and the second body part 112 symmetrically arranged about the plane containing the center line of the through hole (i.e., the channel 4 that runs through the entire tooling body 11). In this way, by simply closing the first body part 111 and the second body part 112 at the weld position of the workpiece to be welded, a complete tooling body 11 can be formed to provide a good gas protection effect for the weld.

[0045] The first body part 111 and the second body part 112 can be detachably connected by means of snap-fit, adhesive, or binding. Alternatively, as... Figure 9 Thus, at least one slot 51, for example six, is provided on the side of the first body portion 111 that contacts the second body portion 112, and then as follows Figure 10 In this way, an equal number of corresponding pins 52 with matching positions are provided on the side of the second body part 112 that contacts the first body part 111, thereby achieving accurate positioning and connection between the first body part 111 and the second body part 112. Obviously, the pins 52 can also be provided on the first body part 111, and the slots 51 can be provided on the second body part 112, with the same technical effect.

[0046] As described in the several embodiments of this invention, this invention provides better gas protection when welding special materials such as small-diameter / thin-walled zirconium and zirconium alloy tubes, setting a precedent for laser welding of small-diameter / thin-walled zirconium and zirconium alloy tubes. This invention offers excellent gas protection, resulting in high-quality weld joints while ensuring that welding deformation remains within acceptable limits. The tooling is simple, processing is convenient, and processing costs are low; it can be used in various environments, is easy to carry and store, and significantly improves welding efficiency.

[0047] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0048] The above preferred embodiments should not be considered as limitations on the present invention, and the scope of protection of the present invention should be determined by the scope defined in the claims. For those skilled in the art, various improvements and modifications can be made without departing from the spirit and scope of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A welding gas shielding fixture, characterized in that: The fixture includes a fixture body (11); the fixture body (11) is provided with a channel (4) for placing the workpiece to be welded, the cross-sectional width of the channel (4) is 0.02mm to 0.3mm larger than the cross-sectional width of the workpiece to be welded, including the endpoint values; the channel (4) is provided with a protective gas circulation groove (3) in the circumferential direction; the fixture body (11) is also provided with at least two air holes (2) in the protective gas circulation groove (3). The channel (4) is a blind hole that does not penetrate the entire tooling body (11); the tooling body (11) is provided with a cap (12) whose position can be adjusted along the length direction of the blind hole, corresponding to the extension direction of the axis of the blind hole. Alternatively, the channel (4) is a through hole that runs through the entire tooling body (11); the tooling body (11) includes a first body part (111) and a second body part (112) that are detachably connected; the first body part (111) and the second body part (112) are symmetrically arranged about the plane containing the center line of the through hole.

2. The welding gas shielding fixture as described in claim 1, characterized in that: The end cap (12) is connected to the tooling body (11) by a thread.

3. The welding gas shielding fixture as described in claim 1, characterized in that: The end cap (12) is interference-fitted with the tooling body (11).

4. The welding gas shielding fixture as described in claim 1, characterized in that: The end cap (12) has a clamping part (121) at the end away from the blind hole.

5. The welding gas shielding fixture as described in claim 1, characterized in that: At least one of the contact surfaces of the first body part (111) and the second body part (112) is provided with a plurality of slots (51), and the other is provided with a matching pin (52) corresponding to the slot (51).

6. A welding gas shielding fixture as described in any one of claims 1-5, characterized in that: The air holes (2) are provided in an even number and are symmetrically distributed along the circumference of the tooling body (11).

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