Welding method for thin-walled pipe and thick-walled part

Abstract

The invention discloses a welding method for a thin-walled pipe and a thick-walled part. The welding method aims at overcoming the defects that the welding difficulty of the thin-walled pipe is large, and the welding effect is poor. The method comprises the following steps that S1, the end of a thin-walled pipe is inserted into a mounting hole in a thick-walled part, and the thin-walled pipe is sleeved with a welding ring; s2, the welding ring abuts against the opening of the mounting hole; and S3, a circle of welding seam is formed at the welding ring through welding, and the welding ring, the outer wall of the thin-walled pipe and the opening of the mounting hole are welded together. The welding operation of the thin-wall pipe fitting and the thick-wall pipe fitting is convenient, the thin-wall pipe fitting does not need to be machined in the welding process, the thin-wall pipe fitting is a standard part which can be bought in the market, the production period is shortened, the cost is reduced, and the welding effect of the thin-wall pipe fitting and the thick-wall pipe fitting is good.

Description

Technical Field

[0001] This invention relates to semiconductor processing equipment, and more specifically, to a method for welding thin-walled tubes to thick-walled components. Background Technology

[0002] The gas piping system of a semiconductor instrument is a core subsystem for precisely delivering ultrapure process gases to the reaction chamber, and its design directly impacts process quality and safety. Its core functions are: Gas delivery: Transporting chemical reaction gases (such as those required for etching or CVD processes) from gas cylinders or sources to the process chamber, ensuring gas purity and flow control. Safety assurance: Preventing explosions or corrosion risks caused by gas leaks through sealing design and leak detection mechanisms. Conventional piping is primarily made of stainless steel, but aluminum alloy is required in specific locations. This welding process, due to its thin wall thickness, is highly complex and requires specific techniques for successful welding. This limits the use of standard tubing, leading to significant inconvenience and a sharp increase in costs in many situations.

[0003] Chinese patent application number 2012102967797 discloses a processing method to improve the strength of friction welded joints of thin-walled pipes, which involves contacting and friction welding the ends of two pipes. This welding method requires high coaxiality between the two welded pipes, and the welding effect is not good when welding pipes with different wall thicknesses. Summary of the Invention

[0004] To overcome the above shortcomings, the present invention provides a welding method for thin-walled pipes and thick-walled components. This method facilitates the welding of thin-walled and thick-walled pipes. The thin-walled pipes are standard parts that can be directly purchased, shortening the production cycle and reducing costs. The welding of thin-walled and thick-walled pipes is convenient and reliable.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a welding method for thin-walled tubes and thick-walled components, comprising the following steps: S1, inserting the end of the thin-walled tube into the mounting hole on the thick-walled component, and fitting a welding ring on the outside of the thin-walled tube; S2, fitting the welding ring against the opening of the mounting hole; S3, welding at the welding ring to form a weld seam, thereby welding the welding ring, the outer wall of the thin-walled tube, and the opening of the mounting hole together.

[0006] When welding thin-walled tubes to thick-walled components, the end of the thin-walled tube is inserted into a mounting hole on the thick-walled component for positioning. The welding point is between the opening of the mounting hole and the outer wall of the thin-walled tube. Before welding, a welding ring is installed at this welding point. During the welding process, the electric arc is biased towards the welding ring, and most of the welding heat is absorbed by the welding ring, which effectively protects the thin-walled tube, preventing damage at the weld and ensuring the reliability of the weld. No pre-processing of the thin-walled component is required before welding; commercially available standard parts can be used, shortening the production cycle and reducing costs.

[0007] Preferably, a chamfer is provided at the opening of the mounting hole.

[0008] The welding ring is placed at the chamfer, and after welding, the weld fills the chamfer, improving the connection strength.

[0009] In the first scheme, the two ends of the welding ring are inclined from the outside to the inside in a direction away from each other, the inner wall of the welding ring is close to the outer wall of the thin-walled tube, and one end face of the welding ring is close to the chamfer.

[0010] The weld ring has an isosceles triangular cross-section. The inner end face of the weld ring mates with the chamfer to ensure weld strength, while the inclined outer end face serves as the welding surface, facilitating the welding operation. The inner wall of the weld ring abuts against the outer wall of the thin-walled tube, providing a large contact area and preventing damage to the tube wall from localized overheating. In the second scheme, one end face of the welding ring is in contact with the surface of the thick-walled component at the edge of the mounting hole, and the other end face of the welding ring is inclined from the outside to the inside and away from the thick-walled component.

[0011] The welding ring end face is directly aligned with the mounting hole end face, eliminating the need for chamfering. This simplifies the welding process, improves work efficiency, and reduces costs.

[0012] The third option involves connecting a shaping sleeve in the mounting hole, setting a convex ring on the inner wall of the mounting hole, and threading the shaping sleeve and the convex ring together to secure them. The end of the shaping sleeve extends out of the mounting hole. In step S1, the end of the thin-walled tube is inserted between the inner wall of the mounting hole and the outer wall of the shaping sleeve, and the end of the thin-walled tube is limited at the convex ring.

[0013] The thin-walled tube end is inserted between the inner wall of the mounting hole and the outer wall of the shaping sleeve. During the welding process, the thin-walled tube is positioned, preventing deformation and damage. The thin-walled tube end is limited at the convex ring, achieving axial positioning of the thin-walled tube.

[0014] The fourth option involves connecting a shaping sleeve in the mounting hole, setting a convex ring on the inner wall of the mounting hole, and extending the end of the shaping sleeve out of the mounting hole; in S1, the end of the thin-walled tube is inserted between the inner wall of the mounting hole and the outer wall of the shaping sleeve, the end of the thin-walled tube is limited at the convex ring, and several circumferentially spaced welding through holes are drilled on the wall of the thin-walled tube, with the welding through holes placed at the opening of the mounting hole.

[0015] The thin-walled tube end is inserted between the inner wall of the mounting hole and the outer wall of the shaping sleeve. During the welding process, the thin-walled tube is positioned, preventing deformation and damage. The thin-walled tube end is limited at the convex ring, achieving axial positioning. After the welding ring melts, the molten metal flows through the welding through-hole to the outer wall of the shaping sleeve, thereby welding the shaping sleeve and the thin-walled tube together, which helps to improve the connection strength between the thin-walled tube and the thick-walled component.

[0016] In the fifth option, during S1, a positioning post is first inserted into the mounting hole. A tapered guide head is set at the end of the positioning post, and a stepped surface is set on the positioning post. The thin-walled tube is inserted from the guide head between the positioning post and the mounting hole, and the end of the thin-walled tube is limited at the stepped surface.

[0017] Before inserting the thin-walled tube into the mounting hole, the positioning pin is first inserted and positioned within the mounting hole. Then, the thin-walled tube is installed. The thin-walled tube is inserted between the positioning pin and the mounting hole through the guide head. The guide head is tapered to facilitate the insertion of the thin-walled tube. The end of the thin-walled tube is limited at the stepped surface to achieve axial positioning. With the thin-walled tube positioned between the positioning pin and the mounting hole, it is less prone to deformation and damage during welding.

[0018] Preferably, a number of radially movable positioning guide plates are installed circumferentially at intervals on the positioning post, and a positioning spring is connected between the positioning guide plate and the positioning post. An inclined guide surface is provided on the outer edge of the positioning guide plate. The welding ring is fitted onto the outside of the positioning post, and the welding ring slides over the guide surface. The outer edge of the positioning guide plate abuts against the inner wall of the welding ring to position the welding ring. Then, a thin-walled tube is inserted between the positioning post and the mounting hole.

[0019] After the positioning post and mounting hole are inserted into place, the welding ring is fitted onto the outside of the positioning post. The welding ring slides over the guide surface, and the outer edge of the positioning guide plate abuts against the inner wall of the welding ring to position it. During the installation of the thin-walled tube into the positioning post, the open end of the thin-walled tube is inserted first with the guide head facing inwards, and then passes between the guide surface of the outer edge of the positioning guide plate and the inner wall of the welding ring until it is in place. The positioning guide plate positions the welding ring, facilitating the insertion of the end of the thin-walled tube into the inner hole of the welding ring.

[0020] Preferably, the positioning column is rotatable, with an expansion hole inside the positioning column and a venting cavity on the side wall of the positioning column. A movable tensioning column is installed in the venting cavity, and high-pressure airflow is introduced through the expansion hole to move the tensioning column outward, thereby achieving tensioning and positioning of the mounting hole and the inner hole of the thin-walled tube. During S3, the rotation of the positioning column drives the thin-walled tube and the thick-walled component to rotate together.

[0021] The tensioning column moves outward to achieve tensioning and positioning of the mounting hole and the inner hole of the thin-walled tube; during the welding process, the positioning column rotates, causing the thin-walled tube and the thick-walled component to rotate together, which facilitates the formation of a weld seam after circumferential welding.

[0022] As a preferred option, S3 is welded using argon arc welding, with filler wire of the same material as the welding ring used to form a complete weld.

[0023] During the welding process, filler wire of the same material as the welding ring is used to control the welding stability and form a complete weld.

[0024] Compared with the prior art, the beneficial effects of the present invention are: (1) The welding operation of thin-walled pipe fittings and thick-walled pipe fittings is convenient. The welding process does not require processing of thin-walled pipes. The thin-walled pipe fittings can be made of standard parts that can be purchased on the market, which is conducive to shortening the production cycle and reducing costs. The welding effect of thin-walled pipe fittings and thick-walled pipe fittings is good; (2) The end of the thin-walled pipe is inserted between the inner wall of the mounting hole and the outer wall of the shaping sleeve. During the welding process, the thin-walled pipe is positioned so that the thin-walled pipe will not be deformed or damaged; (3) Before the thin-walled pipe is inserted into the mounting hole, the positioning post is first inserted into the mounting hole for positioning, and then the thin-walled pipe is installed. The thin-walled pipe is inserted from the guide head between the positioning post and the mounting hole. The guide head is conical, which facilitates the insertion of the thin-walled pipe. The thin-walled pipe is placed between the positioning post and the mounting hole, and it is not easy to be deformed or damaged during the welding process; (4) Several radially moving positioning guide plates are installed circumferentially on the positioning post. The positioning guide plates play a positioning role for the welding ring, which facilitates the insertion of the end of the thin-walled pipe into the inner hole of the welding ring. Attached Figure Description

[0025] Figure 1 This is a welding schematic diagram of Embodiment 1 of the present invention.

[0026] Figure 2 This is a welding schematic diagram of Embodiment 2 of the present invention.

[0027] Figure 3 This is a welding schematic diagram of Embodiment 3 of the present invention.

[0028] Figure 4 This is a welding schematic diagram of Embodiment 4 of the present invention.

[0029] Figure 5 This is a welding schematic diagram of Embodiment 5 of the present invention.

[0030] Figure 6 This is a welding schematic diagram of Embodiment 6 of the present invention.

[0031] Figure 7 This is a welding schematic diagram of Embodiment 7 of the present invention.

[0032] In the diagram: 1. Thin-walled tube, 2. Thick-walled component, 3. Mounting hole, 4. Welding ring, 5. Chamfer, 6. Stepped surface, 7. Shaping sleeve, 8. Convex ring, 9. Welding through hole, 10. Positioning post, 11. Guide head, 12. Flange, 13. Positioning guide plate, 14. Positioning spring, 15. Mounting groove, 16. Extension edge, 17. Limiting head, 18. Guide surface, 19. Air inlet, 20. Vent chamber, 21. Tensioning post, 22. Positioning block, 23. Pre-tensioning spring, 24. Turntable, 25. Positioning seat, 26. Accumulation chamber, 27. Vent ring groove, 28. Flow hole, 29. Air inlet nozzle. Detailed Implementation

[0033] The technical solution of the present invention will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings: Example 1: A welding method for thin-walled tubes and thick-walled components (see...) Figure 1 The process includes the following steps: S1, inserting the end of the thin-walled tube 1 into the mounting hole 3 on the thick-walled component 2. A welding ring 4 is fitted onto the outer wall of the thin-walled tube 1 beforehand. Then, the end of the thin-walled tube 1 is inserted into the mounting hole 3 on the thick-walled component 2. Based on the outer diameter of the thin-walled tube 1, a mounting hole 3 of appropriate size is pre-drilled on the thick-walled component 2. A chamfer 5 is provided at the opening of the mounting hole 3. The thin-walled component and the mounting hole 3 are fitted with a clearance fit. A small gap is controlled between the outer wall of the thin-walled component and the inner wall of the mounting hole 3, with the gap being less than 0.2 mm.

[0034] S2, the welding ring 4 is positioned to meet the opening of the mounting hole 3. The two end faces of the welding ring 4 are inclined from the outside inwards towards each other. The inner wall of the welding ring 4 is against the outer wall of the thin-walled tube 1, and one end face of the welding ring 4 is against the chamfer 5. The cross-section of the welding ring 4 is an isosceles triangle. The inner end face of the welding ring 4 is against the chamfer 5 to ensure welding strength. The inclined outer end face of the welding ring 4 serves as the welding surface, facilitating the welding operation. The large contact area between the inner wall of the welding ring 4 and the outer wall of the thin-walled tube 1 prevents localized overheating and damage to the tube wall.

[0035] S3. Welding is performed at welding ring 4 to form a weld bead, connecting welding ring 4, the outer wall of thin-walled tube 1, and the opening of mounting hole 3 together. The weld strength is good, and the weld joint is reliably sealed. Argon arc welding is used for welding, and welding wire of the same material as welding ring 4 is used as filler to form a complete weld bead.

[0036] When welding the thin-walled tube 1 to the thick-walled component 2, the end of the thin-walled tube 1 is inserted into the mounting hole 3 on the thick-walled component 2 for positioning. The welding position is between the opening of the mounting hole 3 and the outer wall of the thin-walled tube 1. Before welding, a welding ring 4 is installed at this welding position. During the welding process, the electric arc is biased towards the welding ring 4, and most of the welding heat is absorbed by the welding ring 4, which provides good protection for the thin-walled tube 1, preventing damage at the weld and ensuring the reliability of the weld. No pre-processing of the thin-walled component is required before welding; the thin-walled tube 1 can be a commercially available standard part, which shortens the production cycle and reduces costs.

[0037] Example 2: A welding method for thin-walled tubes and thick-walled components (see Example 2) Figure 2The process includes the following steps: S1, inserting the end of the thin-walled tube 1 into the mounting hole 3 on the thick-walled component 2. A welding ring 4 is fitted onto the outer wall of the thin-walled tube 1 beforehand. Then, the end of the thin-walled tube 1 is inserted into the mounting hole 3 on the thick-walled component 2. Based on the outer diameter of the thin-walled tube 1, a suitable mounting hole 3 is pre-drilled on the thick-walled component 2. A chamfer 5 is provided at the opening of the mounting hole 3. The thin-walled component and the mounting hole 3 are fitted with a clearance fit. A small gap is controlled between the outer wall of the thin-walled component and the inner wall of the mounting hole 3, less than 0.2 mm. After drilling the mounting hole 3, one end is enlarged to form a stepped surface 6 on the inner wall of the mounting hole 3. The end of the thin-walled tube 1 rests against the stepped surface 6 to achieve axial positioning.

[0038] S2, the welding ring 4 is positioned to meet the opening of the mounting hole 3. The two end faces of the welding ring 4 are inclined from the outside inwards towards each other. The inner wall of the welding ring 4 is against the outer wall of the thin-walled tube 1, and one end face of the welding ring 4 is against the chamfer 5. The cross-section of the welding ring 4 is an isosceles triangle. The inner end face of the welding ring 4 is against the chamfer 5 to ensure welding strength. The inclined outer end face of the welding ring 4 serves as the welding surface, facilitating the welding operation. The large contact area between the inner wall of the welding ring 4 and the outer wall of the thin-walled tube 1 prevents localized overheating and damage to the tube wall.

[0039] S3. Welding is performed at welding ring 4 to form a weld bead, connecting welding ring 4, the outer wall of thin-walled tube 1, and the opening of mounting hole 3 together. The weld strength is good, and the weld joint is reliably sealed. Argon arc welding is used for welding, and welding wire of the same material as welding ring 4 is used as filler to form a complete weld bead.

[0040] When welding the thin-walled tube 1 to the thick-walled component 2, the end of the thin-walled tube 1 is inserted into the mounting hole 3 on the thick-walled component 2 for positioning. The welding position is between the opening of the mounting hole 3 and the outer wall of the thin-walled tube 1. Before welding, a welding ring 4 is installed at this welding position. During the welding process, the electric arc is biased towards the welding ring 4, and most of the welding heat is absorbed by the welding ring 4, which provides good protection for the thin-walled tube 1, preventing damage at the weld and ensuring the reliability of the weld. No pre-processing of the thin-walled component is required before welding; the thin-walled tube 1 can be a commercially available standard part, which shortens the production cycle and reduces costs.

[0041] Example 3: A welding method for thin-walled tubes and thick-walled components (see Example 4) Figure 3The process includes the following steps: S1, inserting the end of the thin-walled tube 1 into the mounting hole 3 on the thick-walled component 2. A welding ring 4 is fitted onto the outer wall of the thin-walled tube 1 beforehand. Then, the end of the thin-walled tube 1 is inserted into the mounting hole 3 on the thick-walled component 2. Based on the outer diameter of the thin-walled tube 1, a suitable mounting hole 3 is pre-drilled on the thick-walled component 2. The thin-walled component and the mounting hole 3 are fitted with a clearance fit, and a small gap is controlled between the outer wall of the thin-walled component and the inner wall of the mounting hole 3, which is less than 0.2 mm.

[0042] S2, the welding ring 4 is brought into contact with the opening of the mounting hole 3; the cross-section of the welding ring 4 is a right-angled triangular structure, one end face of the welding ring 4 is in contact with the surface of the thick-walled part 2 at the edge of the mounting hole 3, and the other end face of the welding ring 4 is inclined from the outside to the inside away from the thick-walled part 2. Directly bringing the end face of the welding ring 4 into contact with the end face of the mounting hole 3 eliminates the need for chamfering 5, simplifies the welding process, improves work efficiency, and reduces costs.

[0043] S3. Welding is performed at welding ring 4 to form a weld bead, connecting welding ring 4, the outer wall of thin-walled tube 1, and the opening of mounting hole 3 together. The weld strength is good, and the weld joint is reliably sealed. Argon arc welding is used for welding, and welding wire of the same material as welding ring 4 is used as filler to form a complete weld bead.

[0044] When welding the thin-walled tube 1 to the thick-walled component 2, the end of the thin-walled tube 1 is inserted into the mounting hole 3 on the thick-walled component 2 for positioning. The welding position is between the opening of the mounting hole 3 and the outer wall of the thin-walled tube 1. Before welding, a welding ring 4 is installed at this welding position. During the welding process, the electric arc is biased towards the welding ring 4, and most of the welding heat is absorbed by the welding ring 4, which provides good protection for the thin-walled tube 1, preventing damage at the weld and ensuring the reliability of the weld. No pre-processing of the thin-walled component is required before welding; the thin-walled tube 1 can be a commercially available standard part, which shortens the production cycle and reduces costs.

[0045] Example 4: A welding method for thin-walled tubes and thick-walled components (see Example 5) Figure 4 The process includes the following steps: S1, inserting the end of the thin-walled tube 1 into the mounting hole 3 on the thick-walled component 2. A welding ring 4 is fitted onto the outer wall of the thin-walled tube 1 beforehand. Then, the end of the thin-walled tube 1 is inserted into the mounting hole 3 on the thick-walled component 2. Based on the outer diameter of the thin-walled tube 1, a mounting hole 3 of appropriate size is pre-drilled on the thick-walled component 2. A chamfer 5 is provided at the opening of the mounting hole 3. The thin-walled component and the mounting hole 3 are fitted with a clearance fit. A small gap is controlled between the outer wall of the thin-walled component and the inner wall of the mounting hole 3, with the gap being less than 0.2 mm.

[0046] A shaping sleeve 7 is connected to the mounting hole 3. A raised ring 8 is provided on the inner wall of the mounting hole 3. The shaping sleeve 7 and the raised ring 8 are threadedly connected and fastened. The end of the shaping sleeve 7 extends out of the mounting hole 3. After the mounting hole 3 is drilled, it is enlarged from both ends inward to form a raised ring 8 on the inner wall of the mounting hole 3. Then, the inner wall of the raised ring 8 is tapped to form an internal thread. A raised edge is provided at the end of the shaping sleeve 7, and the raised edge is limited at the raised ring 8.

[0047] In step S1, the end of the thin-walled tube 1 is inserted between the inner wall of the mounting hole 3 and the outer wall of the shaping sleeve 7, with the end of the thin-walled tube 1 positioned at the protruding ring 8. This insertion between the inner wall of the mounting hole 3 and the outer wall of the shaping sleeve 7 during welding ensures the thin-walled tube 1 is positioned, preventing deformation and damage. The axial positioning of the thin-walled tube 1 is achieved by positioning the end of the thin-walled tube 1 at the protruding ring 8.

[0048] S2, the welding ring 4 is positioned to meet the opening of the mounting hole 3. The two end faces of the welding ring 4 are inclined from the outside inwards towards each other. The inner wall of the welding ring 4 is against the outer wall of the thin-walled tube 1, and one end face of the welding ring 4 is against the chamfer 5. The cross-section of the welding ring 4 is an isosceles triangle. The inner end face of the welding ring 4 is against the chamfer 5 to ensure welding strength. The inclined outer end face of the welding ring 4 serves as the welding surface, facilitating the welding operation. The large contact area between the inner wall of the welding ring 4 and the outer wall of the thin-walled tube 1 prevents localized overheating and damage to the tube wall.

[0049] S3. Welding is performed at welding ring 4 to form a weld bead, connecting welding ring 4, the outer wall of thin-walled tube 1, and the opening of mounting hole 3 together. The weld strength is good, and the weld joint is reliably sealed. Argon arc welding is used for welding, and welding wire of the same material as welding ring 4 is used as filler to form a complete weld bead.

[0050] When welding the thin-walled tube 1 to the thick-walled component 2, the end of the thin-walled tube 1 is inserted into the mounting hole 3 on the thick-walled component 2 for positioning. The welding position is between the opening of the mounting hole 3 and the outer wall of the thin-walled tube 1. Before welding, a welding ring 4 is installed at this welding position. During the welding process, the electric arc is biased towards the welding ring 4, and most of the welding heat is absorbed by the welding ring 4, which provides good protection for the thin-walled tube 1, preventing damage at the weld and ensuring the reliability of the weld. No pre-processing of the thin-walled component is required before welding; the thin-walled tube 1 can be a commercially available standard part, which shortens the production cycle and reduces costs.

[0051] Example 5: A welding method for thin-walled tubes and thick-walled components (see Example 5) Figure 5The process includes the following steps: S1, inserting the end of the thin-walled tube 1 into the mounting hole 3 on the thick-walled component 2. A welding ring 4 is fitted onto the outer wall of the thin-walled tube 1 beforehand. Then, the end of the thin-walled tube 1 is inserted into the mounting hole 3 on the thick-walled component 2. Based on the outer diameter of the thin-walled tube 1, a mounting hole 3 of appropriate size is pre-drilled on the thick-walled component 2. A chamfer 5 is provided at the opening of the mounting hole 3. The thin-walled component and the mounting hole 3 are fitted with a clearance fit. A small gap is controlled between the outer wall of the thin-walled component and the inner wall of the mounting hole 3, with the gap being less than 0.2 mm.

[0052] The mounting hole 3 is connected to the shaping sleeve 7. A raised ring 8 is provided on the inner wall of the mounting hole 3. The end of the shaping sleeve 7 extends out of the mounting hole 3. After the mounting hole 3 is drilled, it is enlarged from both ends inward, thereby forming a raised ring 8 on the inner wall of the mounting hole 3. A raised edge is provided at the end of the shaping sleeve 7, and the raised edge is limited at the raised ring 8.

[0053] In step S1, the end of the thin-walled tube 1 is inserted between the inner wall of the mounting hole 3 and the outer wall of the shaping sleeve 7. The end of the thin-walled tube 1 is positioned at the convex ring 8. Several circumferentially spaced welding through holes 9 are drilled on the wall of the thin-walled tube 1, and the welding through holes 9 are located at the opening of the mounting hole 3. The insertion of the end of the thin-walled tube 1 between the inner wall of the mounting hole 3 and the outer wall of the shaping sleeve 7 during welding achieves positioning of the thin-walled tube 1, preventing deformation and damage. The convex ring 8 also provides axial positioning of the thin-walled tube 1. After the welding ring 4 melts, the molten metal flows through the welding through holes 9 to the outer wall of the shaping sleeve 7, thereby welding the shaping sleeve 7 and the thin-walled tube 1 together, which helps to improve the connection strength between the thin-walled tube 1 and the thick-walled component 2.

[0054] S2, the welding ring 4 is positioned to meet the opening of the mounting hole 3. The two end faces of the welding ring 4 are inclined from the outside inwards towards each other. The inner wall of the welding ring 4 is against the outer wall of the thin-walled tube 1, and one end face of the welding ring 4 is against the chamfer 5. The cross-section of the welding ring 4 is an isosceles triangle. The inner end face of the welding ring 4 is against the chamfer 5 to ensure welding strength. The inclined outer end face of the welding ring 4 serves as the welding surface, facilitating the welding operation. The large contact area between the inner wall of the welding ring 4 and the outer wall of the thin-walled tube 1 prevents localized overheating and damage to the tube wall.

[0055] S3. Welding is performed at welding ring 4 to form a weld bead, connecting welding ring 4, the outer wall of thin-walled tube 1, and the opening of mounting hole 3 together. The weld strength is good, and the weld joint is reliably sealed. Argon arc welding is used for welding, and welding wire of the same material as welding ring 4 is used as filler to form a complete weld bead.

[0056] When welding the thin-walled tube 1 to the thick-walled component 2, the end of the thin-walled tube 1 is inserted into the mounting hole 3 on the thick-walled component 2 for positioning. The welding position is between the opening of the mounting hole 3 and the outer wall of the thin-walled tube 1. Before welding, a welding ring 4 is installed at this welding position. During the welding process, the electric arc is biased towards the welding ring 4, and most of the welding heat is absorbed by the welding ring 4, which provides good protection for the thin-walled tube 1, preventing damage at the weld and ensuring the reliability of the weld. No pre-processing of the thin-walled component is required before welding; the thin-walled tube 1 can be a commercially available standard part, which shortens the production cycle and reduces costs.

[0057] Example 6: A welding method for thin-walled tubes and thick-walled components (see Example 6) Figure 6 The process includes the following steps: S1, inserting the end of the thin-walled tube 1 into the mounting hole 3 on the thick-walled component 2. A welding ring 4 is fitted onto the outer wall of the thin-walled tube 1 beforehand. Then, the end of the thin-walled tube 1 is inserted into the mounting hole 3 on the thick-walled component 2. Based on the outer diameter of the thin-walled tube 1, a mounting hole 3 of appropriate size is pre-drilled on the thick-walled component 2. A chamfer 5 is provided at the opening of the mounting hole 3. The thin-walled component and the mounting hole 3 are fitted with a clearance fit. A small gap is controlled between the outer wall of the thin-walled component and the inner wall of the mounting hole 3, with the gap being less than 0.2 mm.

[0058] In step S1, the positioning post 10 is first inserted into the mounting hole 3. A tapered guide head 11 is provided at the end of the positioning post 10, and a flange 12 is provided at the other end of the positioning post 10. The flange 12 abuts against the surface of the thick-walled member 2 to achieve axial positioning of the positioning post 10. A stepped surface 6 is provided on the positioning post 10. The thin-walled tube 1 is inserted from the guide head 11 between the positioning post 10 and the mounting hole 3. The end of the thin-walled tube 1 is limited at the stepped surface 6. A number of radially movable positioning guide plates 13 are installed circumferentially at intervals on the positioning post 10. Three positioning guide plates 13 are evenly distributed circumferentially. A positioning spring 14 is connected between the positioning guide plate 13 and the positioning post 10. The positioning post 10 is provided with a mounting groove 15 corresponding to the positioning guide plate 13. Both ends of the positioning guide plate 13 are provided with an extension edge 16. The opening end of the mounting groove 15 is connected to a limiting head 17. The positioning guide plate 13 is installed in the mounting groove 15. The limiting head 17 limits the extension edge 16. The positioning spring 14 abuts between the bottom surface of the mounting groove 15 and the positioning guide plate 13. An inclined guide surface 18 is provided on the outer edge of the positioning guide plate 13. The guide surface 18 is radially outward and inclined towards the thick-walled part 2.

[0059] During installation, the welding ring 4 is fitted over the positioning post 10. The welding ring 4 slides across the guide surface 18, and the outer edge of the positioning guide plate 13 abuts against the inner wall of the welding ring 4 to position it, ensuring that the welding ring 4 and the positioning post 10 are coaxially aligned. Then, the thin-walled tube 1 is inserted between the positioning post 10 and the mounting hole 3. During the installation of the thin-walled tube 1 into the positioning post 10, the open end of the thin-walled tube 1 is first inserted towards the guide head 11, then passes between the guide surface 18 of the outer edge of the positioning guide plate 13 and the inner wall of the welding ring 4 until it is in place. The positioning guide plate 13 positions the welding ring 4, facilitating the insertion of the end of the thin-walled tube 1 into the inner hole of the welding ring 4.

[0060] S2, the welding ring 4 is positioned to meet the opening of the mounting hole 3. The two end faces of the welding ring 4 are inclined from the outside inwards towards each other. The inner wall of the welding ring 4 is against the outer wall of the thin-walled tube 1, and one end face of the welding ring 4 is against the chamfer 5. The cross-section of the welding ring 4 is an isosceles triangle. The inner end face of the welding ring 4 is against the chamfer 5 to ensure welding strength. The inclined outer end face of the welding ring 4 serves as the welding surface, facilitating the welding operation. The large contact area between the inner wall of the welding ring 4 and the outer wall of the thin-walled tube 1 prevents localized overheating and damage to the tube wall.

[0061] S3. Welding is performed at welding ring 4 to form a ring weld, connecting welding ring 4, the outer wall of thin-walled tube 1, and the opening of mounting hole 3 together. The weld strength is good, and the weld joint is reliably sealed. Argon arc welding is used for welding, and welding wire of the same material as welding ring 4 is used as filler to form a complete ring weld. Finally, the thick-walled part 2 is separated from the positioning post 10.

[0062] When welding the thin-walled tube 1 to the thick-walled component 2, the end of the thin-walled tube 1 is inserted into the mounting hole 3 on the thick-walled component 2 for positioning. The welding position is between the opening of the mounting hole 3 and the outer wall of the thin-walled tube 1. Before welding, a welding ring 4 is installed at this welding position. During the welding process, the electric arc is biased towards the welding ring 4, and most of the welding heat is absorbed by the welding ring 4, which provides good protection for the thin-walled tube 1, preventing damage at the weld and ensuring the reliability of the weld. No pre-processing of the thin-walled component is required before welding; the thin-walled tube 1 can be a commercially available standard part, which shortens the production cycle and reduces costs.

[0063] Example 7: A welding method for thin-walled tubes and thick-walled components (see Example 7) Figure 7The process includes the following steps: S1, inserting the end of the thin-walled tube 1 into the mounting hole 3 on the thick-walled component 2. A welding ring 4 is fitted onto the outer wall of the thin-walled tube 1 beforehand. Then, the end of the thin-walled tube 1 is inserted into the mounting hole 3 on the thick-walled component 2. Based on the outer diameter of the thin-walled tube 1, a mounting hole 3 of appropriate size is pre-drilled on the thick-walled component 2. A chamfer 5 is provided at the opening of the mounting hole 3. The thin-walled component and the mounting hole 3 are fitted with a clearance fit. A small gap is controlled between the outer wall of the thin-walled component and the inner wall of the mounting hole 3, with the gap being less than 0.2 mm.

[0064] In step S1, the positioning post 10 is first inserted into the mounting hole 3. A tapered guide head 11 is provided at the end of the positioning post 10, and a flange 12 is provided at the other end of the positioning post 10. The flange 12 abuts against the surface of the thick-walled member 2 to achieve axial positioning of the positioning post 10. A stepped surface 6 is provided on the positioning post 10. The thin-walled tube 1 is inserted from the guide head 11 between the positioning post 10 and the mounting hole 3. The end of the thin-walled tube 1 is limited at the stepped surface 6. A number of radially movable positioning guide plates 13 are installed circumferentially at intervals on the positioning post 10. Three positioning guide plates 13 are evenly distributed circumferentially. A positioning spring 14 is connected between the positioning guide plate 13 and the positioning post 10. The positioning post 10 is provided with a mounting groove 15 corresponding to the positioning guide plate 13. Both ends of the positioning guide plate 13 are provided with an extension edge 16. The opening end of the mounting groove 15 is connected to a limiting head 17. The positioning guide plate 13 is installed in the mounting groove 15. The limiting head 17 limits the extension edge 16. The positioning spring 14 abuts between the bottom surface of the mounting groove 15 and the positioning guide plate 13. An inclined guide surface 18 is provided on the outer edge of the positioning guide plate 13. The guide surface 18 is radially outward and inclined towards the thick-walled part 2.

[0065] During installation, the welding ring 4 is fitted over the positioning post 10. The welding ring 4 slides across the guide surface 18, and the outer edge of the positioning guide plate 13 abuts against the inner wall of the welding ring 4 to position it, ensuring that the welding ring 4 and the positioning post 10 are coaxially aligned. Then, the thin-walled tube 1 is inserted between the positioning post 10 and the mounting hole 3. During the installation of the thin-walled tube 1 into the positioning post 10, the open end of the thin-walled tube 1 is first inserted towards the guide head 11, then passes between the guide surface 18 of the outer edge of the positioning guide plate 13 and the inner wall of the welding ring 4 until it is in place. The positioning guide plate 13 positions the welding ring 4, facilitating the insertion of the end of the thin-walled tube 1 into the inner hole of the welding ring 4.

[0066] S2, the welding ring 4 is positioned to meet the opening of the mounting hole 3. The two end faces of the welding ring 4 are inclined from the outside inwards towards each other. The inner wall of the welding ring 4 is against the outer wall of the thin-walled tube 1, and one end face of the welding ring 4 is against the chamfer 5. The cross-section of the welding ring 4 is an isosceles triangle. The inner end face of the welding ring 4 is against the chamfer 5 to ensure welding strength. The inclined outer end face of the welding ring 4 serves as the welding surface, facilitating the welding operation. The large contact area between the inner wall of the welding ring 4 and the outer wall of the thin-walled tube 1 prevents localized overheating and damage to the tube wall.

[0067] S3. Welding is performed at welding ring 4 to form a ring weld, connecting welding ring 4, the outer wall of thin-walled tube 1, and the opening of mounting hole 3 together. The weld strength is good, and the weld joint is reliably sealed. Argon arc welding is used for welding, and welding wire of the same material as welding ring 4 is used as filler to form a complete ring weld. Finally, the thick-walled part 2 is separated from the positioning post 10.

[0068] The positioning column 10 is rotatably mounted, with an expansion hole 19 inside. A venting cavity 20 is located on the side wall of the positioning column 10, and a movable tensioning column 21 is installed within the venting cavity 20. Three circumferentially distributed tensioning columns 21 are installed on the positioning column 10 corresponding to the mounting hole 3, and three circumferentially distributed tensioning columns 21 are also installed on the positioning column 10 corresponding to the thin-walled tube 1. A positioning block 22 is installed at the open end of the venting cavity 20, and a preload spring 23 is installed between the positioning block 22 and the tensioning column 21. The positioning column 10 is connected to a turntable 24, which is rotatably mounted on a positioning seat 25. A pressure accumulator 26 is located on the turntable 24, and the expansion hole 19 communicates with the pressure accumulator 26. A venting ring groove 27 is located inside the positioning seat 25, and a flow hole 28 communicating with the pressure accumulator 26 and the venting ring groove 27 is located inside the turntable 24. An air inlet 29 communicating with the venting ring groove 27 is located on the fixed seat, and the air inlet 29 is connected to a high-pressure air supply pipe. Turntable 24 is connected to the motor output shaft. High-pressure airflow is introduced into the expansion hole 19 through the high-pressure air supply pipe, causing the tensioning column 21 to move outward, thereby achieving tensioning and positioning of the mounting hole 3 and the inner hole of the thin-walled tube 1; during S3, the motor drives the positioning column 10 to rotate, causing the thin-walled tube 1 and the thick-walled part 2 to rotate together, which facilitates the formation of a weld seam after circumferential welding.

[0069] When welding the thin-walled tube 1 to the thick-walled component 2, the end of the thin-walled tube 1 is inserted into the mounting hole 3 on the thick-walled component 2 for positioning. The welding position is between the opening of the mounting hole 3 and the outer wall of the thin-walled tube 1. Before welding, a welding ring 4 is installed at this welding position. During the welding process, the electric arc is biased towards the welding ring 4, and most of the welding heat is absorbed by the welding ring 4, which provides good protection for the thin-walled tube 1, preventing damage at the weld and ensuring the reliability of the weld. No pre-processing of the thin-walled component is required before welding; the thin-walled tube 1 can be a commercially available standard part, which shortens the production cycle and reduces costs.

[0070] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any way. Other variations and modifications may be made without departing from the technical solutions described in the claims.

Claims

1. A method for welding a thin-walled tube to a thick-walled component, characterized in that, Includes the following steps: S1, Insert the end of the thin-walled tube into the mounting hole on the thick-walled component, with a welding ring fitted on the outside of the thin-walled tube; S2, Fit the welding ring against the opening of the mounting hole; S3, Weld the welding ring to form a weld, so that the welding ring, the outer wall of the thin-walled tube, and the opening of the mounting hole are welded together.

2. The welding method for thin-walled tubes and thick-walled components according to claim 1, characterized in that, The mounting hole openings are chamfered.

3. The welding method for thin-walled tubes and thick-walled components according to claim 2, characterized in that, The two ends of the welding ring are inclined from the outside to the inside in a direction away from each other. The inner wall of the welding ring is close to the outer wall of the thin-walled tube, and one end face of the welding ring is close to the chamfer.

4. The welding method for thin-walled tubes and thick-walled components according to claim 1, characterized in that, One end face of the welding ring is in contact with the surface of the thick-walled component at the edge of the mounting hole, and the other end face of the welding ring is inclined from the outside to the inside and away from the thick-walled component.

5. The welding method for thin-walled tubes and thick-walled components according to claim 1, characterized in that, A shaping sleeve is connected in the mounting hole, and a convex ring is provided on the inner wall of the mounting hole. The shaping sleeve and the convex ring are threaded and fastened, and the end of the shaping sleeve extends out of the mounting hole. In S1, the end of the thin-walled tube is inserted between the inner wall of the mounting hole and the outer wall of the shaping sleeve, and the end of the thin-walled tube is limited at the convex ring.

6. The welding method for thin-walled tubes and thick-walled components according to claim 1, characterized in that, A shaping sleeve is connected in the mounting hole, and a convex ring is provided on the inner wall of the mounting hole. The end of the shaping sleeve extends out of the mounting hole. In S1, the end of the thin-walled tube is inserted between the inner wall of the mounting hole and the outer wall of the shaping sleeve. The end of the thin-walled tube is limited at the convex ring. Several circumferentially spaced welding through holes are drilled on the tube wall of the thin-walled tube, and the welding through holes are placed at the opening of the mounting hole.

7. The welding method for thin-walled tubes and thick-walled components according to claim 1, characterized in that, In step S1, a positioning post is first inserted into the mounting hole. A tapered guide head is provided at the end of the positioning post, and a stepped surface is provided on the positioning post. The thin-walled tube is inserted from the guide head between the positioning post and the mounting hole, and the end of the thin-walled tube is limited at the stepped surface.

8. The welding method for thin-walled tubes and thick-walled components according to claim 7, characterized in that, Several radially movable positioning guide plates are installed circumferentially at intervals on the positioning post. A positioning spring is connected between the positioning guide plate and the positioning post. An inclined guide surface is provided on the outer edge of the positioning guide plate. The welding ring is fitted onto the outside of the positioning post. The welding ring slides over the guide surface, and the outer edge of the positioning guide plate abuts against the inner wall of the welding ring to position the welding ring. Then, a thin-walled tube is inserted between the positioning post and the mounting hole.

9. A welding method for thin-walled tubes and thick-walled components according to claim 7, characterized in that, The positioning column is rotated and has an air hole inside. A venting cavity is set on the side wall of the positioning column, and a movable tensioning column is installed in the venting cavity. High-pressure airflow is introduced into the air hole, causing the tensioning column to move outward, thereby achieving tensioning and positioning of the mounting hole and the inner hole of the thin-walled tube. During S3, the rotation of the positioning column drives the thin-walled tube and the thick-walled component to rotate together.

10. A welding method for a thin-walled tube and a thick-walled component according to any one of claims 1 to 9, characterized in that, S3 is welded using argon arc welding. During welding, the filler wire is made of the same material as the welding ring, forming a complete weld ring.

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