A stainless steel plumbing fitting and its production process

Abstract

The present invention discloses a stainless steel plumbing joint and its production process, which includes a hexagonal shaft sleeve and a first connecting sleeve and a second connecting sleeve inserted into the hexagonal shaft sleeve. A first welding ring is circumferentially welded between the outer ring of the end face of the first connecting sleeve and the inner wall of the hexagonal shaft sleeve. A chamfer is provided on the end face of the second connecting sleeve; a second welding ring is also circumferentially welded between the outer wall of the second connecting sleeve and the end face of the hexagonal shaft sleeve away from the first connecting sleeve. The end faces of the first connecting sleeve and the second connecting sleeve are in contact with each other, and a receiving space is formed between the chamfer and the end face of the first connecting sleeve, and the receiving space is for receiving the first welding ring. The present invention has the following advantages and effects: This solution uses a new mechanical structure and has the effects of environmental protection, simple process, high processing efficiency, low production cost, and light weight of the finished product.

Description

Technical Field

[0001] The present invention relates to the technical field of connectors, and particularly to a stainless steel plumbing connector and its production process. Background Art

[0002] A plumbing connector is a standard component that can be used to connect a water pipe and a water meter. One end of its main body is an R1 thread and the other end is a G1 thread. A G1 nut is threadedly connected to the G1 thread section. The R1 thread is connected to the water pipe through a sealing tape, and the G1 thread is connected to the water meter through the G1 nut. The nut is used for abutting and fixing. The existing production processes for manufacturing plumbing connectors are mainly divided into two types: 1) Using brass as the main production material for the connector, and then integrally forming the connector through a red punching process (hot forging). The disadvantage of this production process is that the cost is relatively high and the process is relatively complex; 2) Using stainless steel as the main production material for the connector, and then integrally forming the connector through a lost wax casting process. The disadvantage of this production process is that a large amount of pollution sources will be generated during the lost wax casting process, which has a certain degree of pollution and will pollute the environment.

[0003] The plumbing connectors in the prior art are all made by an integral forming method, and have the disadvantages of relatively complex processing, low production efficiency, large weight and high production cost. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, an object of the present invention is to provide a stainless steel plumbing connector, which has the effects of more convenient production process and lower cost. Another object of the present invention is to provide a production process for a stainless steel plumbing connector, which has the effects of simple process, high production efficiency and low production cost.

[0005] The above technical object of the present invention is achieved through the following technical solutions: A stainless steel plumbing connector includes a hexagonal bushing and a first connecting sleeve and a second connecting sleeve inserted into the hexagonal bushing. A first welding ring is circumferentially welded between the outer circle of the end face of the first connecting sleeve and the inner wall of the hexagonal bushing. A chamfer is provided on the end face of the second connecting sleeve; A second welding ring is also circumferentially welded between the outer wall of the second connecting sleeve and the end face of the hexagonal bushing far from the first connecting sleeve. The end faces of the first connecting sleeve and the second connecting sleeve abut against each other, and a receiving space is formed between the chamfer and the end face of the first connecting sleeve for receiving the first welding ring.

[0006] By adopting the above technical solution, the processed first connecting sleeve and second connecting sleeve are welded corresponding to the hexagonal shaft sleeve to form an integral body. Chamfers are formed on the end faces where the first connecting sleeve and the second connecting sleeve abut against each other to form a receiving space for the first welding ring to be received. The end faces of the first connecting sleeve and the second connecting sleeve are tightly connected without generating gaps. Not only is the overall structure ingeniously arranged and not prone to water seepage, but also the processing process is relatively simple, the production cost is relatively low, and the water flowing inside the joint is not polluted, which is more environmentally friendly.

[0007] In a preferred example of the present invention, it can be further configured that: a first annular groove is formed on the outer wall of the first connecting sleeve, a resisting step is formed between the first annular groove and the outer wall of the first connecting sleeve, the hexagonal shaft sleeve is sleeved in the first annular groove, the hexagonal shaft sleeve and the resisting step are in resisting cooperation, and the outer ring of the end face of the first annular groove is welded to the inner wall of the hexagonal shaft sleeve to form a first welding ring.

[0008] By adopting the above technical solution, when welding the hexagonal shaft sleeve to the first connecting sleeve, first sleeve the hexagonal shaft sleeve into the first annular groove, and make the end face of the hexagonal shaft sleeve abut tightly against the resisting step, then positioning can be achieved. Since a first connection surface is formed between the end face of the first connecting sleeve and the inner wall of the hexagonal shaft sleeve, laser welding on the first connection surface can fix the two. Under the resisting action of the resisting step, the welding process is relatively stable and not prone to position deviation.

[0009] In a preferred example of the present invention, it can be further configured that: a second annular groove is formed on the outer wall of the second connecting sleeve, the hexagonal shaft sleeve is sleeved in the second annular groove, and the end face of the hexagonal shaft sleeve is welded to the groove wall of the second annular groove to form a second welding ring.

[0010] By adopting the above technical solution, the end of the second connecting sleeve provided with the second annular groove is inserted into the hexagonal shaft sleeve, so that the end face of the second connecting sleeve abuts tightly against the end face of the first connecting sleeve. A second connection surface is formed between the groove wall of the second annular groove and the end face of the hexagonal shaft sleeve, and laser welding on the second connection surface can fix the two.

[0011] In a preferred example of the present invention, it can be further configured that: a limiting step is formed between the second annular groove and the outer side wall of the second connecting sleeve, an insertion gap is formed between the limiting step and the end face of the hexagonal shaft sleeve, and the second welding ring is located in the insertion gap.

[0012] By adopting the above technical solution, the insertion gap can facilitate the welding head to extend when welding the second welding ring, and the welding process is relatively flexible and convenient.

[0013] In a preferred example of the present invention, it can be further configured that: the end face of the second connecting sleeve away from the first connecting sleeve is bent radially inward to form a convex ring.

[0014] By adopting the above technical solution, when the nut is connected to the second connecting sleeve, a flat washer needs to be installed at the outer end of the nut and the second connecting sleeve. After the end of the second connecting sleeve is bent inward to form a convex ring, on the premise that the wall thickness of the second connecting sleeve is small, the area in contact with the flat washer is increased, making it not easy to leak water, and the weight is relatively small compared with the prior art.

[0015] In a preferred example of the present invention, it can be further configured that the first connecting sleeve, the second connecting sleeve and the hexagonal bushing are all made of stainless steel.

[0016] By adopting the above technical solution, the first connecting sleeve, the second connecting sleeve and the hexagonal bushing are all made of stainless steel, which has better corrosion resistance, longer service life and higher overall strength compared with brass materials.

[0017] Another technical object of the present invention is achieved through the following technical solution: a production process for a stainless steel plumbing joint, including the following process steps:

[0018] 1), respectively process the blanks of the first component, the second component and the third component:

[0019] a. Turn the outer diameter and inner diameter of the first component, and axially turn out the first annular notch from the end on the outer wall of the first component, then the first connecting sleeve can be turned out. After turning, the outer diameter at the first annular notch of the first connecting sleeve is D1;

[0020] b. Turn the outer diameter and inner diameter of the second component, and axially turn out the second annular notch from the end on the outer wall of the second component, then the second connecting sleeve can be turned out. After turning, the outer diameter at the second annular notch of the second connecting sleeve is also D1; chamfer the end face of the second connecting sleeve near the second annular notch;

[0021] c. Cut the hollow hexagonal bar stock into several hexagonal bushings, and turn the central through hole into an inner diameter of D2, where D2 is always greater than D1;

[0022] 2), insert the first annular notch of the first connecting sleeve into the central through hole of the hexagonal bushing correspondingly, a first connecting surface is formed between the end face of the first annular notch and the inner wall of the hexagonal bushing, that is, the first welding position, and a first welding ring is formed at the first welding position by laser welding;

[0023] 3), Insert the second annular notch of the second connecting sleeve into the central through hole of the hexagonal bushing correspondingly, so that the end face of the second connecting sleeve located inside the hexagonal bushing abuts against the end face of the first connecting sleeve located inside the hexagonal bushing, and a receiving space is formed between the chamfer and the end face of the first connecting sleeve. The receiving space is used to receive the first welding ring; a second connecting surface is formed between the second annular notch and the end face of the hexagonal bushing, that is, the second welding position. A second welding ring is formed at the second welding position by laser welding.

[0024] By adopting the above technical solution, the receiving space prepares for the welding at the first welding position, ensuring that the first welding ring has sufficient receiving space, thereby reducing the contact gap between the end face of the first connecting sleeve and the end face of the second connecting sleeve, and having a good effect of preventing water seepage. In addition, by forming the whole by laser welding the blank components through turning processing, not only the process is simple, the production cost is low, the weight is small, the weld seams of laser welding are uniform, the efficiency is high, but also the products prepared by this process have high strength, are relatively environmentally friendly without pollution compared with the prior art, and can be well applied in fields such as water meters and pipelines.

[0025] In a preferred example of the present invention, it can be further configured as follows: In step 1, the length L1 of the first annular notch axially opened is L1, the length L2 of the second annular notch axially opened is L2, the thickness of the hexagonal bushing is L3, L1 + L2 > L3, and an insertion gap is formed between the end face of the hexagonal bushing and the second connecting sleeve. The second welding ring is located in the insertion gap.

[0026] In a preferred example of the present invention, it can be further configured as follows: The length L1 of the first annular notch axially opened is 2.8 mm, the length L2 of the second annular notch axially opened is 7.8 mm, the thickness L3 of the hexagonal bushing is 7.6 mm, and the length of the insertion gap is 3.0 mm.

[0027] In a preferred example of the present invention, it can be further configured as follows: The outer diameters D1 of both the first annular notch and the second annular notch are set to 30.4 mm - 30.5 mm, and the inner diameter D2 of the central through hole of the hexagonal bushing is set to 30.5 mm - 30.6 mm.

[0028] By adopting the above technical solution, when D1 is less than D2, it is convenient for the first connecting sleeve or the second connecting sleeve to be inserted into the central through hole of the hexagonal bushing; when D1 = D2, the first connecting sleeve and the second connecting sleeve are respectively in close fit with the central through hole of the hexagonal bushing, with good sealing performance and not easy to seep water.

[0029] In summary, the present invention has the following beneficial effects:

[0030] 1. Adopt the splicing method of a split first connecting sleeve, second connecting sleeve and hexagonal shaft sleeve, and fix and connect the three by laser welding. The end faces of the first connecting sleeve and the second connecting sleeve are closely connected without gaps. Not only is the overall structure ingeniously set up and not prone to water seepage, but also the processing process is relatively simple, the production cost is relatively low, and the water flowing inside the joint will not be polluted;

[0031] 2. Adopt the cooperation of the low-step and the hexagonal shaft sleeve to make the welding process relatively stable and not prone to position deviation;

[0032] 3. Adopt the method of forming an insertion gap between the hexagonal shaft sleeve and the limiting step of the second connecting sleeve, which can facilitate the insertion of the welding head when welding the second welding ring, and the welding process is relatively flexible and convenient. Description of the Drawings

[0033] Figure 1 It is a cross-sectional view of the overall structure in the assembled state of the embodiment.

[0034] Figure 2 It is Figure 1 The enlarged view of area A in

[0035] Figure 3 It is a cross-sectional view of the separated state of the embodiment.

[0036] Reference Numerals: 1, first connecting sleeve; 11, first annular notch; 12, low-step; 13, taper pipe thread; 2, second connecting sleeve; 21, second annular notch; 22, chamfer; 23, limiting step; 24, convex ring; 25, pipe thread; 3, hexagonal shaft sleeve; 4, first welding position; 5, accommodating space; 6, insertion gap; 7, second welding position; 8, stepped through hole. Detailed Embodiment

[0037] The following further describes the present invention in detail with reference to the drawings. For the convenience of description, the following "left" and "right" are both in the same direction as shown in the attached Figure 1 drawings.

[0038] A stainless steel plumbing fitting and its production process, a stainless steel plumbing fitting, as Figures 1-3As shown in the figure, it is a schematic structural relationship diagram of a plumbing joint, including a first connecting sleeve 1, a second connecting sleeve 2 and a hexagonal shaft sleeve 3 with an outer hexagon, which are coaxially arranged. The first connecting sleeve 1 and the second connecting sleeve 2 are respectively inserted into both ends of the hexagonal shaft sleeve 3. The inner diameters of the first connecting sleeve 1 and the second connecting sleeve 2 are the same. The outer wall of the first connecting sleeve 1 is provided with a first annular notch 11, and the first annular notch 11 is axially opened from the right end of the first connecting sleeve 1. A taper pipe thread 13 is also provided on the first connecting sleeve 1. A resisting step 12 is formed between the first annular notch 11 and the taper pipe thread 13. The hexagonal shaft sleeve 3 is sleeved on the first annular notch 11 from the right side, and the left end of the hexagonal shaft sleeve 3 is in resisting cooperation with the resisting step 12. The outer ring of the right end face of the first annular notch 11 is welded to the inner wall of the hexagonal shaft sleeve 3 along the circumferential direction to form a first welding ring, as shown in Attachment Figure 2 at the first welding position 4.

[0039] The outer wall of the second connecting sleeve 2 is provided with a second annular notch 21 and a pipe thread 25. The second annular notch 21 is axially opened from the left end of the second connecting sleeve 2. A chamfer 22 is provided on the outer ring of the left end face of the second connecting sleeve 2. The left end of the second connecting sleeve 2 extends into the hexagonal shaft sleeve 3 from right to left. The end faces of the first connecting sleeve 1 and the second connecting sleeve 2 are in contact with each other. An accommodating space 5 is formed between the chamfer 22 and the end face of the first connecting sleeve 1, and the accommodating space 5 is for the first welding ring to be accommodated. A limiting step 23 is formed between the second annular notch 21 and the outer side wall of the second connecting sleeve 2. An inserting gap 6 is formed between the limiting step 23 and the end face of the hexagonal shaft sleeve 3. The inserting gap 6 also functions as a tool withdrawal groove when the pipe thread 25 is being cut. A nut is threadedly connected to the pipe thread 25. The groove wall of the second annular notch 21 is welded to the right end circumference of the hexagonal shaft sleeve 3 to form a second welding ring, as shown in Attachment Figure 2 at the second welding position 7, that is, a second welding ring is formed at the second welding position 7, and the second welding ring is located in the inserting gap 6. The right end face of the second connecting sleeve 2 is bent radially inward by a forming die to form a convex ring 24, forming a stepped through hole 8. When the nut is connected to the second connecting sleeve 2, a flat washer needs to be installed between the nut and the outer end of the second connecting sleeve 2. After the convex ring 24 is bent inward at the end of the second connecting sleeve 2, on the premise that the wall thickness of the second connecting sleeve 2 is relatively small (the wall thickness is only 2.5 mm), the area in contact with the flat washer is increased, and it is not easy to leak water. Compared with the prior art, the weight is smaller. In the prior art, the wall thickness is usually 3.6 mm.

[0040] In this embodiment, the first connecting sleeve 1, the second connecting sleeve 2 and the hexagonal shaft sleeve 3 are all made of stainless steel, which has better corrosion resistance, longer service life and higher overall strength compared with brass materials.

[0041] The production process of the stainless steel plumbing joint includes the following process steps:

[0042] 1), Process the blanks of the first component, the second component, and the third component respectively:

[0043] a. Turn the outer diameter and inner diameter of the first component, which is in the shape of a sleeve as a whole. Turn the outer diameter to 33 mm, the inner diameter to 28 mm, and the overall length to 24.1 mm. And axially turn out the first annular notch 11 on the outer wall of the first component from the right end. Then the first connecting sleeve 1 can be turned out. After turning, the outer diameter at the first annular notch 11 of the first connecting sleeve 1 is D1, and the length of the first annular notch 11 axially opened is L1;

[0044] b. Turn the outer diameter and inner diameter of the second component, which is in the shape of a sleeve as a whole. Turn the outer diameter to 33 mm, the inner diameter to 28 mm, and the overall length to 17.8 mm. And axially turn out the second annular notch 21 on the outer wall of the second component from the end. Then the second connecting sleeve 2 can be turned out. After turning, the outer diameter at the second annular notch 21 of the second connecting sleeve 2 is also D1, and the length of the second annular notch 21 axially opened is L2; Chamfer 22 is opened at the end face of the second connecting sleeve 2 near the second annular notch 21, and a stepped through hole with a hole diameter of 25.8 mm is turned out on the right end convex ring 24;

[0045] c. Cut the hollow hexagonal bar stock into several hexagonal bushings. The thickness of the hexagonal bushing is L3, L1 + L2 ≥ L3. The distance between the opposite sides of the hexagonal bushing is controlled at 34 mm, and the central through hole is turned into an inner diameter of D2, and D2 is always greater than D1;

[0046] 2), Insert the first annular notch 11 of the first connecting sleeve 1 correspondingly into the through hole of the hexagonal bushing 3. A first connection surface, that is, the first welding position 4, is formed between the end face of the first annular notch 11 and the inner wall of the hexagonal bushing 3. A first welding ring is formed at the first welding position 4 by laser welding;

[0047] 3), Insert the second annular notch 21 of the second connecting sleeve 2 correspondingly into the through hole of the hexagonal bushing 3, so that the end face of the second connecting sleeve 2 located inside the hexagonal bushing 3 abuts against the end face of the first connecting sleeve 1 located inside the hexagonal bushing 3. A receiving space 5 is formed between the chamfer 22 and the end face of the first connecting sleeve 1, and the receiving space 5 is used to receive the first welding ring; A second connection surface, that is, the second welding position 7, is formed between the second annular groove and the end face of the hexagonal bushing 3. A second welding ring is formed at the second welding position 7 by laser welding.

[0048] In this embodiment, the length L1 of the first annular notch 11 opened along the axial direction is 2.8 mm, the length L2 of the second annular notch 21 opened along the axial direction is 7.8 mm, and the thickness L3 of the hexagonal bushing 3 is 7.6 mm. Thus, the length of the insertion gap 6 formed between the right end face of the hexagonal bushing 3 and the limiting step 23 of the second connecting sleeve 2 is 3.0 mm. In other embodiments, the manner of L1 + L2 = L3 can also be adopted so that the end portions of the hexagonal bushing 3 are respectively abutted against the first connecting sleeve 1 and the second connecting sleeve 2.

[0049] In this embodiment, the outer diameters D1 of both the first annular notch 11 and the second annular notch 21 are set to be 30.4 mm to 30.5 mm, and the inner diameter D2 of the central through hole of the hexagonal bushing 3 is set to be 30.5 mm to 30.6 mm. When D1 is less than D2, it is convenient for the first connecting sleeve 1 or the second connecting sleeve 2 to be inserted into the central through hole of the hexagonal bushing 3; when D1 = D2, the first connecting sleeve 1 and the second connecting sleeve 2 are respectively in close fit with the central through hole of the hexagonal bushing 3, and the sealing performance is good and it is not easy to seep water.

[0050] The basic working principle of the present invention is as follows: When the hexagonal bushing 3 is welded to the first connecting sleeve 1, first, the hexagonal bushing 3 is sleeved in the first annular notch 11, and the left end face of the hexagonal bushing 3 is abutted against the resisting step 12, and then positioning can be achieved. Since a first connection surface is formed between the end face of the first connecting sleeve 1 and the inner wall of the hexagonal bushing 3, the two can be fixed by welding on the first connection surface using a laser. Under the resisting action of the resisting step 12, the welding process is relatively stable and is not likely to shift in position.

[0051] The left end of the second connecting sleeve 2 is inserted into the hexagonal bushing 3, so that the left end face of the second connecting sleeve 2 is abutted against the right end face of the first connecting sleeve 1. A second connection surface is formed between the groove wall of the second annular notch 21 and the end face of the hexagonal bushing 3. The two can be fixed by welding on the second connection surface using a laser. The insertion gap 6 can facilitate the welding head to extend in when welding the second welding ring, and the welding process is relatively flexible and convenient.

[0052] A chamfer 22 is formed on the end faces where the first connecting sleeve 1 and the second connecting sleeve 2 are in contact with each other to form a receiving space 5 for receiving the first welding ring. The receiving space 5 prepares for the welding at the first welding position 4, ensuring that the first welding ring has sufficient receiving space 5, thereby reducing the contact gap between the end face of the first connecting sleeve 1 and the end face of the second connecting sleeve 2. The end faces of the first connecting sleeve 11 and the second connecting sleeve 22 are tightly connected. Not only is the overall structure ingeniously arranged, but it is not easy to leak water. In addition, by forming the whole by laser welding the respective blank components through turning processing, not only is the process simple, the production cost low, the weight small, the weld seam of the laser welding is uniform, and the efficiency is high, but also the product prepared by this process has high strength. Compared with the prior art, it is pollution-free and more environmentally friendly, and the finished product is pollution-free, and can be well applied in fields such as water meters and pipelines.

[0053] The specific embodiments are only explanations of the present invention, and they do not limit the present invention. After reading this specification, those skilled in the art can make modifications to this embodiment without creative contributions according to needs, but as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A stainless - steel plumbing joint, characterized in that: it includes a hexagonal bushing (3) and a first connecting sleeve (1) and a second connecting sleeve (2) inserted into the hexagonal bushing (3). A first welding ring is circumferentially welded between the outer ring of the end face of the first connecting sleeve (1) and the inner wall of the hexagonal bushing (3). A chamfer (22) is provided on the end face of the second connecting sleeve (2); A second welding ring is also circumferentially welded between the outer wall of the second connecting sleeve (2) and the end face of the hexagonal bushing (3) far from the first connecting sleeve (1). The end faces of the first connecting sleeve (1) and the second connecting sleeve (2) are in contact with each other. A receiving space (5) is formed between the chamfer (22) and the end face of the first connecting sleeve (1), and the first welding ring is received in the receiving space (5); A first annular notch (11) is provided on the outer wall of the first connecting sleeve (1). A resisting step (12) is formed between the first annular notch (11) and the outer wall of the first connecting sleeve (1). The hexagonal bushing (3) is sleeved on the first annular notch (11), and the hexagonal bushing (3) is in resisting cooperation with the resisting step (12). The outer ring of the end face of the first annular notch (11) is welded to the inner wall of the hexagonal bushing (3) to form the first welding ring; A second annular notch (21) is provided on the outer wall of the second connecting sleeve (2). The hexagonal bushing (3) is sleeved on the second annular notch (21). The end face of the hexagonal bushing (3) is welded to the groove wall of the second annular notch (21) to form the second welding ring; A convex ring (24) is formed by bending the end face of the second connecting sleeve (2) far from the first connecting sleeve (1) radially inward; A limiting step (23) is formed between the second annular notch (21) and the outer side wall of the second connecting sleeve (2). An insertion gap (6) is formed between the limiting step (23) and the end face of the hexagonal bushing (3), and the second welding ring is located in the insertion gap (6).

2. The stainless - steel plumbing joint according to claim 1, characterized in that: the first connecting sleeve (1), the second connecting sleeve (2) and the hexagonal bushing (3) are all made of stainless steel.

3. A production process for the stainless - steel plumbing joint according to any one of claims 1 - 2, characterized in that: it includes the following process steps: 1). Process the blanks of the first component, the second component and the third component respectively: a. Turn the outer diameter and inner diameter of the first component, and axially turn a first annular notch (11) from the end on the outer wall of the first component, then the first connecting sleeve (1) can be turned. After turning, the outer diameter at the first annular notch (11) of the first connecting sleeve (1) is D1; b. Turn the outer diameter and inner diameter of the second component, and axially turn a second annular notch (21) from the end on the outer wall of the second component, then the second connecting sleeve (2) can be turned. After turning, the outer diameter at the second annular notch (21) of the second connecting sleeve (2) is also D1; A chamfer (22) is provided at the end face of the second connecting sleeve (2) near the second annular notch (21); c. Cut the hollow hexagonal bar stock into several hexagonal shaft sleeves (3), and turn the central through-hole thereof to an inner diameter of D2, where D2 is always greater than D1; 2). Insert the first annular notch (11) of the first connecting sleeve (1) correspondingly into the central through-hole of the hexagonal shaft sleeve (3). A first connecting surface, i.e., a first welding position, is formed between the end surface of the first annular notch (11) and the inner wall of the hexagonal shaft sleeve (3). A first welding ring is formed at the first welding position by laser welding; 3). Insert the second annular notch (21) of the second connecting sleeve (2) correspondingly into the central through-hole of the hexagonal shaft sleeve (3), such that the end surface of the second connecting sleeve (2) located inside the hexagonal shaft sleeve (3) abuts against the end surface of the first connecting sleeve (1) located inside the hexagonal shaft sleeve (3). A receiving space (5) is formed between the chamfer (22) and the end surface of the first connecting sleeve (1), and the receiving space (5) is used to receive the first welding ring; a second connecting surface, i.e., a second welding position, is formed between the second annular notch (21) and the end surface of the hexagonal shaft sleeve (3). A second welding ring is formed at the second welding position by laser welding.

4. The production process of the stainless-steel plumbing joint according to claim 3, characterized in that: In step 1, the length of the first annular notch (11) axially opened is L1, the length of the second annular notch (21) axially opened is L2, and the thickness of the hexagonal shaft sleeve (3) is L3, where L1 + L2 > L3. An insertion gap (6) is formed between the end surface of the hexagonal shaft sleeve (3) and the second connecting sleeve (2), and the second welding ring is located in the insertion gap (6).

5. The production process of the stainless-steel plumbing joint according to claim 4, characterized in that: The length L1 of the first annular notch (11) axially opened is 2.8 mm, the length L2 of the second annular notch (21) axially opened is 7.8 mm, the thickness L3 of the hexagonal shaft sleeve (3) is 7.6 mm, and the length of the insertion gap (6) is 3.0 mm.

6. The production process of the stainless-steel plumbing joint according to claim 3, characterized in that: The outer diameters of the first annular notch (11) and the second annular notch (21) are both set to be 30.4 mm - 30.5 mm, and the inner diameter D2 of the central through-hole of the hexagonal shaft sleeve (3) is set to be 30.5 mm - 30.6 mm.

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