A method of welded fabrication of a fluid filter assembly and a fluid filter assembly

Abstract

The application discloses a welding manufacturing method of a fluid filtering assembly and the fluid filtering assembly, and relates to the field of filtering assembly manufacturing. A cylindrical connecting piece for fixing a bag opening of a filter bag is interference-fitted between a pipe body and a joint, so that the inner and outer peripheries of a welding end are chamfered to form annular gaps which are closed at the lower ends and open upward. High-energy beams are used to locally melt the pipe body and the joint in a selected angle interval around the pipe body axis, so as to form a first melt and a second melt which respectively flow into the two annular gaps. When the first melt is formed, the other annular gap is kept in communication with the outside, so that the two melts converge above the welding end before solidification and are fused with the welding end. The beam spot always avoids the cylindrical connecting piece, and the interference contact part is kept in contact and not melted by continuous cooling. The circumferential welding is repeated to form a continuous sealing ring weld. The application is beneficial to keeping assembly positioning and reducing direct concentrated heating on the cylindrical connecting piece.

Description

Technical Field

[0001] This invention relates to the field of fluid filtration component manufacturing technology, specifically to a welding manufacturing method for a fluid filtration component and a fluid filtration component. Background Technology

[0002] Fluid filtration assemblies are used to filter fluids flowing through pipelines. In fluid filtration assemblies that use filter bags as the filtration element, the filter bags are housed within the pipe body, and the bag opening is fixed by a connector and connected to the inlet for fluid supply. The fixed point at the bag opening needs to withstand the load generated by the fluid action while maintaining a seal to reduce the bypass of unfiltered fluid from the bag opening connection.

[0003] Existing technologies already include solutions that use ring-shaped metal parts and welding methods to fix filter materials. For example, Chinese invention patent application CN107875707A discloses a tank liquid path filter element and its welding method, which fixes the cap edge of the cap-shaped filter layer by the inner ring and outer ring of the filter element, and uses stainless steel solder to weld the inner ring, outer ring and filter layer together in the welding groove formed by the inner ring and outer ring of the filter element.

[0004] For fluid filtration assemblies that require the connection of the filter bag opening connector to the tube body and joints, the welding process needs to balance the fusion between multiple metal parts and the positioning stability of the bag opening connector. When the space at the connection point is relatively tight, direct concentrated heating of the bag opening connector may cause localized overheating or deformation; while reducing the heating intensity may lead to insufficient fusion at the connection interface. In addition, when the molten metal fills the connection gap, it is also necessary to consider the discharge of gas within the gap and the control of the flow of molten metal into the tube body. Therefore, how to achieve a sealed weld between multiple metal parts while maintaining the stability of the assembly position is a problem that needs to be solved in the manufacturing of such fluid filtration assemblies. Summary of the Invention

[0005] The purpose of this invention is to provide a welding manufacturing method for a fluid filter assembly and a fluid filter assembly, so as to achieve fusion and sealing connection between the tube body, the joint and the cylindrical connector while maintaining the stable assembly position of the cylindrical connector.

[0006] To achieve the above objectives, the present invention provides a welding manufacturing method for a fluid filtration assembly, comprising: S1. Provides a metal tube body, connector, and cylindrical connector for fixing the filter bag opening; the tube body has an upward-facing assembly opening; one end of the cylindrical connector is a welded end, and both the inner and outer circumferences of the welded end are chamfered; S2. Slide the cylindrical connector over the joint, and then press the joint and the cylindrical connector together into the pipe body through the assembly opening; so that the welding end is inside the pipe body and the joint extends out of the assembly opening; annular gaps are formed between the chamfer of the outer periphery of the welding end and the inner wall of the pipe body, and between the chamfer of the inner periphery of the welding end and the outer wall of the joint; both annular gaps are open towards the assembly opening and gradually narrow towards the inside of the pipe body along the axial direction; the cylindrical connector is press-fitted to the inner wall of the pipe body and the outer wall of the joint to close the ends of the two annular gaps away from the assembly opening; S3. Within a selected angular range around the axis of the tube body, a high-energy beam is used to irradiate the portion of the tube body and the joint located above the welding end, causing the portion to melt locally and forming a first melt that flows into the annular gap below the portion, while keeping the other annular gap connected to the external space through the assembly opening. S4. Within the same angular range, before the first melt solidifies, a high-energy beam irradiates the portion of the other component of the tube and the joint located above the welding end, causing that portion to partially melt and form a second melt flowing into the annular gap below that portion; the first melt and the second melt merge above the welding end and fuse with the welding end before solidification; during the welding process, the beam spot of the high-energy beam always avoids the cylindrical connector and continuously cools the interference contact area between the cylindrical connector and the inner wall of the tube and the outer wall of the joint, keeping them in contact and preventing them from melting; S5. Move the irradiation position of the high-energy beam around the axis of the tube body, switch to the adjacent angle interval in sequence, and repeat S3 and S4 to make the weld seams of the adjacent angle intervals overlap to form a continuous sealed circumferential weld seam.

[0007] Furthermore, welding is performed using a first high-energy beam and a second high-energy beam that can be controlled independently; In S3, a first high-energy beam is used to irradiate the portion of one of the tube body and the joint located above the welding end to form a first melt. In S4, the second high-energy beam irradiates the portion of the tube body and the joint located above the welding end to form a second melt; when the second high-energy beam begins to irradiate, the first high-energy beam is switched to irradiate the first melt, keeping the first melt in an unsolidified state until the first melt and the second melt merge.

[0008] Furthermore, both the first high-energy beam and the second high-energy beam are pulsed laser beams; the single-pulse energy of the first high-energy beam when irradiating the first melt in S4 is lower than the single-pulse energy of the first high-energy beam when forming the first melt in S3.

[0009] Furthermore, during the welding process, a cooling jacket that fits against the outer wall of the tube is set on the outer periphery of the tube, and a cooling mandrel that fits against the inner wall of the joint is set inside the joint. The interference contact points between the cooling jacket and the cylindrical connector and the inner wall of the tube are arranged radially along the tube body, and the interference contact points between the cooling mandrel and the cylindrical connector and the outer wall of the joint are arranged radially along the tube body; the cooling jacket and the cooling mandrel are cooled by the cooling medium flowing inside them respectively. After welding, remove the cooling jacket and cooling mandrel.

[0010] Furthermore, during S3 and S4, argon gas is introduced into the assembly opening to place the two annular gaps, the first melt, and the second melt in an argon protective atmosphere.

[0011] Furthermore, the tube body and cylindrical connector are both made of stainless steel, and the joint is made of copper.

[0012] Furthermore, before performing S2, the filter bag opening is sealed and fixed to the end of the cylindrical connector away from the welding end; in S2, before pressing the connector together with the cylindrical connector into the tube body, the filter bag is first placed into the tube body through the assembly opening.

[0013] The present invention also provides a fluid filtration assembly, including a tube body, a connector, a cylindrical connector, and a filter bag; the tube body, connector, and cylindrical connector are connected by any of the above-mentioned welding manufacturing methods, the filter bag is located inside the tube body, and the bag opening of the filter bag is sealed and fixed to the cylindrical connector.

[0014] Compared with the prior art, the present invention has the following beneficial effects: This invention utilizes a cylindrical connector with an interference fit to both the inner wall of the tube and the outer wall of the joint. During welding, the interference contact area is continuously cooled, maintaining contact without melting. This ensures the cylindrical connector remains in position during fusion with the first and second molten materials. A continuous, sealed circumferential weld is formed by overlapping welds in adjacent angle intervals, achieving a fixed connection and seal between the tube, joint, and cylindrical connector, balancing fusion at the connection point with stable assembly position. Simultaneously, the high-energy beam consistently avoids the cylindrical connector, reducing the risk of localized overheating caused by direct concentrated irradiation.

[0015] When the first melt is formed, the present invention maintains another annular gap connected to the external space through the assembly opening, thus reserving a channel for the gas to be discharged from the annular gap; at the same time, the interference contact part is used to close the ends of the two annular gaps away from the assembly opening, blocking the melt from flowing into the tube body along the annular gap, thereby taking into account both venting and melt flow control during the melt filling and merging process.

[0016] In the scheme employing independently controllable first and second high-energy beams, the second high-energy beam forms the second melt while the first high-energy beam switches to irradiating the first melt, keeping it in an unsolidified state until the first and second melts merge. By separately controlling the formation of the second melt and the heat preservation of the first melt, it is beneficial to coordinate the timing of the merging of the two melts and reduce the adverse effects of premature solidification of the first melt on melt merging and welding end fusion.

[0017] In the scheme using a cooling jacket and a cooling mandrel, the cooling jacket is fitted to the outer wall of the tube body, and the cooling mandrel is fitted to the inner wall of the joint. They are respectively set to correspond to the two interference contact parts along the radial direction of the tube body, so that the heat transferred to the two interference contact parts during the welding process can be conducted outward through the tube body and the joint, and carried away by the flowing cooling medium, which is beneficial to maintaining the contact state of the two interference contact parts. Attached Figure Description

[0018] Figure 1 This is an axial cross-sectional view of the fluid filtration assembly of the present invention in its assembled state before welding. Figure 2 for Figure 1 A magnified view of a portion of point I; Figure 3 A schematic diagram illustrating how to partially melt the tube within a selected angle range to form a first melt. Figure 4 A schematic diagram illustrating the process of forming a second melt within the same angular range while heating the first melt; Figure 5 for Figure 2 A partial sectional view of the area shown after welding is completed; Figure 6 A top view schematic diagram showing the switching angle range of the high-energy beam irradiation position along the circumference of the tube; Figure 7 Axial sectional view showing the positions of the cooling jacket and cooling mandrel.

[0019] Explanation of reference numerals in the attached drawings: 1. Tube body; 101. Assembly opening; 2. Joint; 3. Cylindrical connector; 301. Welded end; 302. Chamfer; 4. Filter bag; 5. Annular gap; 6. Interference contact area; 7. First melt; 8. Second melt; 9. Circumferential weld; 10. First high-energy beam; 11. Second high-energy beam; 12. Cooling jacket; 13. Cooling mandrel; 14. Cooling medium channel; 15. Angle range. Detailed Implementation

[0020] The specific embodiments of the present invention will now be described with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or corresponding structures.

[0021] In this specification, axial and radial refer to the axial and radial directions of the tube body 1, respectively. During welding, the assembly opening 101 of the tube body 1 faces upward, and the terms "above" and "below" as used below are based on this welding posture. Figure 1 and Figure 7 The connection structure at the end of the tube body 1 furthest from the assembly opening 101 is omitted. Figure 2 for Figure 1 A magnified view of section I in the middle.

[0022] Example 1

[0023] This embodiment provides a welding manufacturing method for a fluid filtration assembly. The method involves partially melting the pipe body 1 and the connector 2, and fusing the resulting melt with the welding end 301 of the cylindrical connector 3, thereby fixing the cylindrical connector 3 between the pipe body 1 and the connector 2. Specifically, it includes the following steps.

[0024] S1. Provides a metal tube 1, a connector 2, and a cylindrical connector 3 for fixing the bag opening of the filter bag 4.

[0025] like Figure 1 and Figure 2 As shown, the tube body 1 has an assembly opening 101 for inserting the cylindrical connector 3 and the filter bag 4. The connector 2 is a tubular component with a through-hole. One end of the cylindrical connector 3 is a welding end 301, and both the inner and outer peripheries of the welding end 301 are provided with chamfers 302 extending circumferentially. Figure 2 An annular end face is retained between the two chamfers 302 shown.

[0026] In this embodiment, the pipe body 1 and the cylindrical connector 3 are both made of stainless steel, and the joint 2 is made of copper. Before assembly, the mating surfaces and welding areas of the pipe body 1, joint 2, and cylindrical connector 3 are cleaned to remove oil, oxides, and burrs that may affect assembly and fusion.

[0027] Before performing S2, the opening of the filter bag 4 is sealed and fixed to the end of the cylindrical connector 3 away from the welding end 301, so that the interior of the filter bag 4 is in communication with the inner hole of the cylindrical connector 3. The fixing part of the filter bag opening and the welding end 301 are spaced apart axially. For example, when the filter bag 4 is made of metal filter mesh, its opening periphery can be continuously welded and fixed to the inner periphery of the cylindrical connector 3, so that fluid cannot flow around the filter bag 4 between the opening and the cylindrical connector 3.

[0028] S2. Slide the cylindrical connector 3 over the joint 2, and then press the joint 2 together with the cylindrical connector 3 into the tube body 1 through the assembly opening 101.

[0029] Specifically, the cylindrical connector 3 and the joint 2 are first interlocked. Then, the filter bag 4, which is fixed to the cylindrical connector 3, is placed into the tube 1 through the assembly opening 101. Subsequently, the part of the joint 2 that is interlocked with the cylindrical connector 3 is pressed into the tube 1. After assembly, the welding end 301 is located inside the tube 1, the joint 2 extends out of the assembly opening 101, the bag body of the filter bag 4 is located inside the tube 1 below the cylindrical connector 3, and the inner hole of the joint 2 communicates with the inside of the filter bag 4 through the inner hole of the cylindrical connector 3.

[0030] like Figure 2 As shown, an annular gap 5 is formed between the chamfer 302 on the outer periphery of the welding end 301 and the inner wall of the pipe body 1, and another annular gap 5 is formed between the chamfer 302 on the inner periphery of the welding end 301 and the outer wall of the joint 2. For ease of explanation, the former will be referred to as the outer annular gap and the latter as the inner annular gap. Both annular gaps 5 are open toward the assembly opening 101 and gradually narrow inward toward the interior of the pipe body 1 along the axial direction of the pipe body 1.

[0031] The cylindrical connector 3 has an interference fit with the inner wall of the tube body 1 on its outer circumferential surface below the two chamfers 302, and an interference fit with the outer wall of the connector 2 on its inner circumferential surface below the two chamfers 302, forming interference contact portions 6. The two interference contact portions 6 are in continuous contact circumferentially, sealing off the ends of the two annular gaps 5 away from the assembly opening 101. Through the above interference fit, the cylindrical connector 3, the tube body 1, and the connector 2 are kept in the assembled position, and a contact area is formed below the two annular gaps 5 to prevent the molten material from continuing to flow into the tube body 1.

[0032] After assembly, the end of the tube body 1 adjacent to the assembly opening 101 is higher than the welding end 301, and the joint 2 also has a portion located above the welding end 301. These portions are respectively located above the outer annular gap and the inner annular gap, allowing for subsequent high-energy beam irradiation and localized melting. The two interference contact portions 6 are located below the subsequent fusion region and are retained during welding.

[0033] The irradiated portions of both the tube body 1 and the connector 2 are located above the corresponding interference contact portions 6. The assembly depth determines the axial distance between the welding end 301 and the end of the tube body 1. When selecting the assembly depth and the dimensions of the two chamfers 302, the volume to be filled in the two annular gaps 5 and the amount of metal required to form the connection area above the welding end 301 are used as the basis for determining the local melting amount, and the continuous wall portion of the tube body 1 and the connector 2 is retained outside the irradiated portion. The cylindrical connector 3 retains circumferentially continuous inner and outer mating surfaces below the two chamfers 302 to form two interference contact portions 6.

[0034] Before starting welding, such as Figure 7As shown, a cooling jacket 12 is provided on the outer periphery of the tube body 1, so that the cooling jacket 12 fits against the outer wall of the tube body 1; a cooling mandrel 13 is provided inside the joint 2, so that the cooling mandrel 13 fits against the inner wall of the joint 2. The interference contact portion 6 between the cooling jacket 12 and the cylindrical connector 3 and the inner wall of the tube body 1 is arranged radially correspondingly to the tube body 1, and the interference contact portion 6 between the cooling mandrel 13 and the cylindrical connector 3 and the outer wall of the joint 2 is arranged radially correspondingly to the tube body 1. One end of the cooling mandrel 13 extending into the joint 2 is spaced apart from the filter bag 4.

[0035] Both the cooling jacket 12 and the cooling mandrel 13 are equipped with cooling medium channels 14. Circulating cooling medium is introduced into these channels 14, carrying away heat from the area near the interference fit 6 through the walls of the tube body 1 and the joint 2. Circulating cooling water can be used as the cooling medium, flowing within the cooling jacket 12 and the cooling mandrel 13 without entering the two annular gaps 5. Cooling begins before the high-energy beam irradiation starts and continues throughout the subsequent welding process, ensuring that the two interference fits 6 remain in contact and do not melt. Figure 7 In the image, the arrows at the cooling jacket 12 indicate the direction of the cooling medium flowing into and out of the cooling jacket 12, and the arrows inside the cooling mandrel 13 indicate the flow direction of the cooling medium in its internal cooling medium channel 14.

[0036] The welding heat input acts on the pipe body 1 and joint 2 above the welding end 301. The cooling jacket 12 and cooling mandrel 13 respectively conduct heat from the corresponding interference contact parts 6 through the walls of the pipe body 1 and joint 2. The cooling medium circulates inside the tooling and does not directly contact the first melt 7, the second melt 8, or the welding end 301. Through the above-mentioned setting of heating position and heat conduction path, the welding end 301 and its adjacent area participate in fusion, while two interference contact parts 6 are reserved below it. The interference amount and fit length are selected according to the materials, wall thicknesses, and assembly relationships of the three metal parts; in addition to limiting the temperature rise of the contact parts during welding, it is also necessary to maintain their interference contact state to maintain the assembly position and prevent the melt from flowing downward.

[0037] This embodiment employs a first high-energy beam 10 and a second high-energy beam 11, both of which are pulsed laser beams and can be independently controlled. The output parameters and irradiation positions of the two pulsed laser beams are controlled separately to adapt to the materials and local wall thicknesses of the tube body 1 and the joint 2. Before irradiation begins, argon gas is introduced into the assembly opening 101, and the gas supply is continuous during the execution of S3 and S4, so that the two annular gaps 5 and the formed first melt 7 and second melt 8 are in an argon protective atmosphere. The supply direction and flow rate of the protective gas should be such that it can cover the welding area without significantly disturbing the melt.

[0038] The irradiation procedure of the first high-energy beam 10 includes a formation stage that partially melts the tube 1 and a maintenance stage that continues to heat the first melt 7. The emission parameters and irradiation position are set for each stage. The start command of the second high-energy beam 11 is coordinated with the command to switch the first high-energy beam 10 to the maintenance stage, ensuring that the first melt 7 continues to receive maintenance heating during the formation of the second melt 8. When the first high-energy beam 10 turns from the tube 1 to the first melt 7, the irradiation position is switched while emission is stopped, and then emission is performed with the parameters of the maintenance stage to avoid the beam spot on the switching path directly irradiating the cylindrical connector 3. The time required for switching is included in the time from the formation of the first melt 7 to the merging of the two melts.

[0039] S3. Within a selected angular interval 15 around the axis of the tube body 1, the tube body 1 is partially melted to form the first melt 7.

[0040] like Figure 6 As shown, angle interval 15 is the selected circumferential angle range around the axis of the tube body 1, and also corresponds to the parts of the tube body 1, the joint 2 and the cylindrical connector 3 that are in the same circumferential orientation. Figure 6 The radial dashed line is used to indicate the schematic boundary of the angle interval 15. There is no need to set a physical partition corresponding to this boundary on the pipe body 1, the joint 2 and the cylindrical connector 3. Figure 6 The arc-shaped arrows in the diagram indicate the direction in which the irradiation positions of the first high-energy beam 10 and the second high-energy beam 11 advance circumferentially around the axis of the tube body 1 and sequentially switch to adjacent angle intervals 15.

[0041] like Figure 3 As shown, within the selected angle range 15, a first high-energy beam 10 irradiates the portion of the tube body 1 located above the welding end 301, causing that portion to partially melt. The irradiation position shown is located in the end region of the tube body 1 adjacent to the assembly opening 101. The resulting first melt 7 flows into the lower outer annular gap and spreads along the wall of the outer annular gap.

[0042] When the first melt 7 is formed, the local melting amount of the tube 1 is limited by controlling the irradiation time and heat input of the first high-energy beam 10, so that the inner annular gap is not yet closed by the melt and remains connected to the external space through the assembly opening 101. Thus, the unfilled inner annular gap retains an exhaust space, and the gas in this inner annular gap can be discharged through the assembly opening 101. Figure 3 The dashed arrow in the image indicates its discharge direction.

[0043] S4. Within the same angle range 15, before the first melt 7 solidifies, the joint 2 is partially melted to form the second melt 8, and the two are made to merge above the welding end 301 and fuse with the welding end 301.

[0044] like Figure 4As shown, the portion of the joint 2 located above the welding end 301 is irradiated by the second high-energy beam 11, causing this portion to partially melt and form a second melt 8 flowing into the inner annular gap. When the second high-energy beam 11 begins irradiation, the irradiation position of the first high-energy beam 10 is transferred from the tube 1 to the first melt 7, supplementing the first melt 7 with heat and keeping it in an unsolidified state until the first melt 7 merges with the second melt 8.

[0045] The single-pulse energy of the first high-energy beam 10 when irradiating the first melt 7 in S4 is lower than the single-pulse energy when it partially melts the tube 1 in S3. In this embodiment, when switching the irradiation target, the first high-energy beam 10 maintains a constant pulse repetition frequency and reduces the single-pulse energy to lower the average output power of the first high-energy beam 10. The reduced single-pulse energy and the duration of heating should be coordinated with the formation and merging process of the second melt 8 so that the first melt 7 remains in an unsolidified state before the two melts merge.

[0046] As the second melt 8 forms and flows into the inner annular gap, the first melt 7 and the second melt 8 spread along the chamfers 302 on both sides of the welding end 301, and converge above the welding end 301 before solidification. By adjusting the heat input, irradiation time, and melting amount of the metal on both sides of the two high-energy beams, the melt in contact with the welding end 301 transfers heat to the welding end 301, causing local melting of the surface layer of the welding end 301, and forming a common molten area with the first melt 7 and the second melt 8. After the molten area solidifies, a weld is formed connecting the pipe body 1, the joint 2, and the cylindrical connector 3.

[0047] In this embodiment, the stainless steel and copper material combination consists of a first melt 7 formed from a stainless steel tube 1 and a second melt 8 formed from a copper connector 2. Two high-energy beams respectively handle the melting and subsequent heating of the corresponding metals. The first melt 7 contacts the chamfer 302 on the outer periphery of the welding end 301, and the second melt 8 contacts the chamfer 302 on the inner periphery of the welding end 301. The combined melt covers the connection area above the welding end 301. The fusion process requires the localized melting of the surface layer of the welding end 301 and its participation in the formation of a common melting area. The localized melting of the copper connector 2 and the filling of the two annular gaps 5 represent intermediate states in this process. The emission parameters and heating time of the two high-energy beams should be selected separately to balance the melting of the two materials, the sustained heating of the first melt 7, and the participation of the surface layer of the welding end 301 in the fusion process.

[0048] During S3 and S4, the incident beams of the two high-energy beams always avoid the cylindrical connector 3. Specifically, when irradiating the tube 1 or the connector 2, the incident direction, beam size, and irradiation position are adjusted so that the beam falls on the corresponding metal part; when supplementing heat to the first melt 7, the beam falls on the surface of the first melt 7 and avoids the exposed surface of the cylindrical connector 3. The welding end 301 of the cylindrical connector 3 is heated and fused by contact with the melt, while the two interference contact portions 6 below it remain in contact and do not melt under continuous cooling.

[0049] The two annular gaps 5 are continuous circumferentially, allowing the first melt 7 and the second melt 8 to spread circumferentially. The angle interval 15 is used to define the irradiation position and processing sequence, and does not require the boundary of the melt to coincide with the boundary of the angle interval 15. By coordinating the irradiation time, the start-up interval of the two high-energy beams, and the maintenance heating time of the first melt 7, the first melt 7 and the second melt 8 in the current irradiation area can merge before solidification. Figure 3 and Figure 4 The melt outline in the image is used to indicate its location and formation process.

[0050] S5. Move the irradiation position of the high-energy beam around the axis of the tube body 1, switch to the adjacent angle interval 15 in sequence, and repeat S3 and S4 to form a continuous sealed circumferential weld 9.

[0051] like Figure 6 As shown, after the fusion of the melt within an angle interval 15 and the fusion of the welding end 301 are completed, the irradiation positions of the first high-energy beam 10 and the second high-energy beam 11 are advanced along the circumference of the tube body 1 and enter the adjacent angle interval 15. In the unwelded parts of the newly entered angle interval 15, welding is still carried out in the order of first forming the first melt 7, then forming the second melt 8 and merging the two.

[0052] The welding ranges of adjacent angle intervals 15 overlap circumferentially. When welding a subsequent angle interval 15, the irradiation trajectory covers the edge of the previous welding range, causing the edge to partially remelt and connect with the newly formed weld; after completing one circumferential cycle, the end welding range overlaps with the starting welding range, forming a weld as shown in the image. Figure 5 The continuously sealed circumferential weld 9 is shown. The range of the angle interval 15 and the advance amount of the irradiation position are determined according to the actual welding range to form a continuous connection between adjacent welds.

[0053] Throughout the welding process from S3 to S5, continuous cooling is maintained at the two interference-fit joints 6. After the circumferential weld 9 is completed, high-energy beam irradiation is stopped. Once the welded area has solidified and cooled, the supply of cooling medium is stopped, and the cooling jacket 12 and cooling mandrel 13 are removed. The cooling jacket 12 and cooling mandrel 13 are welding auxiliary tooling and are not retained in the resulting fluid filter assembly.

[0054] The pulse energy, pulse repetition frequency, pulse width, beam size, irradiation time, start-up interval of the two high-energy beams, and cooling conditions are jointly selected based on the material grade, wall thickness, dimensions of the two chamfers 302, assembly depth, and interference fit. The formation and maintenance stages of the first high-energy beam 10 are set with separate parameters, and the parameters of the second high-energy beam 11 are set independently; the cooling medium flow rates of the cooling jacket 12 and the cooling mandrel 13 can also be adjusted separately.

[0055] Specific process conditions can be selected using test pieces with the same material, dimensions, and assembly relationship as the parts to be welded. First, with the cooling jacket 12 and cooling mandrel 13 set up and the cooling medium introduced, the irradiation positions and light output parameters for locally melting the tube body 1 and joint 2 and allowing the melt to flow into the corresponding annular gap are determined. Then, the irradiation program of the two high-energy beams is combined in the order of S3 and S4, and the holding heating time of the first high-energy beam 10 and the irradiation time of the second high-energy beam 11 are adjusted so that the melts on both sides merge before solidification. The holding phase of the first high-energy beam 10 uses a single pulse energy lower than that of the formation phase, and the holding heating conditions are determined together with the pulse repetition frequency and the holding heating time.

[0056] When the above conditions are selected, the melt formation and fusion process of the specimen can be observed, and a cross-section of the welded area after solidification can be prepared to check whether there is a fusion area at the weld end 301, and whether there are melting marks on the interference contact area 6 to be retained below. By combining the inspection of the relative positions and contact states of the three metal parts during the welding process, the fusion at the weld end 301 and the retention of the interference contact area 6 below can be distinguished. If insufficient fusion occurs at the weld end 301, the heating time or heat input of the melt in contact with it should be adjusted; if melting occurs in the contact area below or the fit condition changes, the irradiation position, the duration of a single irradiation, or the corresponding cooling conditions should be adjusted, and the melt fusion and the fusion of the weld end 301 should be rechecked. For workpieces with changed dimensions or materials, appropriate process conditions should be selected.

[0057] The above method takes the partial melting of the tube body 1 first, followed by the partial melting of the joint 2, as an example. In other embodiments, the joint 2 can be partially melted first to form the first melt 7, and then the tube body 1 can be partially melted to form the second melt 8, with the irradiation positions and order of the two high-energy beams adjusted accordingly. The first melt 7 and the second melt 8 are distinguished according to the order of their formation. When the same high-energy beam is used to irradiate the metal parts on both sides in sequence, the switching of the irradiation position and the formation of the second melt 8 should be completed before the solidification of the first melt 7, and the conditions for the first melt 7 and the second melt 8 to merge and the welding end 301 to fuse should be met.

[0058] Example 2

[0059] This embodiment provides a fluid filtration assembly manufactured using the above-described welding method, comprising a tube body 1, a connector 2, a cylindrical connector 3, and a filter bag 4. The connector 2 extends into the assembly opening 101 of the tube body 1, the cylindrical connector 3 is located between the inner wall of the tube body 1 and the outer wall of the connector 2, and the filter bag 4 is located inside the tube body 1, with its bag opening sealed and fixed to the end of the cylindrical connector 3 away from the welding end 301.

[0060] like Figure 5 As shown, the pipe body 1, the connector 2, and the cylindrical connector 3 are connected by a circumferential weld 9. The circumferential weld 9 extends continuously in the circumferential direction and fuses with the welding end 301, fixing the cylindrical connector 3 between the pipe body 1 and the connector 2, while sealing the connection between the three. Two interference contact points 6 located below the circumferential weld 9 are retained, located between the cylindrical connector 3 and the inner wall of the pipe body 1, and between the cylindrical connector 3 and the outer wall of the connector 2, respectively.

[0061] In use, the fluid to be filtered enters the filter bag 4 through the inner hole of the connector 2 and the bag opening of the filter bag 4. After passing through the filter wall of the filter bag 4, it enters the space between the outside of the filter bag 4 and the inner wall of the tube body 1, and then flows out from the other end of the tube body 1. The sealed connection between the bag opening of the filter bag 4 and the cylindrical connector 3 restricts the fluid from bypassing the bag opening connection; the circumferential weld 9 connects the cylindrical connector 3 to the tube body 1 and the connector 2, keeping the bag opening of the filter bag 4 fixed. The connection structure between the other end of the tube body 1 and the external pipeline is omitted in the attached drawing.

Claims

1. A welding manufacturing method for a fluid filter assembly, characterized in that, include: S1. Provides a metal tube body, connector, and cylindrical connector for fixing the filter bag opening; the tube body has an upward-facing assembly opening; one end of the cylindrical connector is a welded end, and both the inner and outer circumferences of the welded end are chamfered; S2. Slide the cylindrical connector over the joint, and then press the joint and the cylindrical connector together into the pipe body through the assembly opening; so that the welding end is inside the pipe body and the joint extends out of the assembly opening; annular gaps are formed between the chamfer of the outer periphery of the welding end and the inner wall of the pipe body, and between the chamfer of the inner periphery of the welding end and the outer wall of the joint; both annular gaps are open towards the assembly opening and gradually narrow towards the inside of the pipe body along the axial direction; the cylindrical connector is press-fitted to the inner wall of the pipe body and the outer wall of the joint to close the ends of the two annular gaps away from the assembly opening; S3. Within a selected angular range around the axis of the tube body, a high-energy beam is used to irradiate the portion of the tube body and the joint located above the welding end, causing the portion to melt locally and forming a first melt that flows into the annular gap below the portion, while keeping the other annular gap connected to the external space through the assembly opening. S4. Within the same angular range, before the first melt solidifies, a high-energy beam irradiates the portion of the other component of the tube and the joint located above the welding end, causing that portion to partially melt and form a second melt flowing into the annular gap below that portion; the first melt and the second melt merge above the welding end and fuse with the welding end before solidification; during the welding process, the beam spot of the high-energy beam always avoids the cylindrical connector and continuously cools the interference contact area between the cylindrical connector and the inner wall of the tube and the outer wall of the joint, keeping them in contact and preventing them from melting; S5. Move the irradiation position of the high-energy beam around the axis of the tube body, switch to the adjacent angle interval in sequence, and repeat S3 and S4 to make the weld seams of the adjacent angle intervals overlap to form a continuous sealed circumferential weld seam.

2. The welding manufacturing method of the fluid filter assembly according to claim 1, characterized in that, Welding is performed using a first high-energy beam and a second high-energy beam that can be controlled independently. In S3, a first high-energy beam is used to irradiate the portion of one of the tube body and the joint located above the welding end to form a first melt. In S4, the second high-energy beam irradiates the portion of the tube body and the joint located above the welding end to form a second melt; when the second high-energy beam begins to irradiate, the first high-energy beam is switched to irradiate the first melt, keeping the first melt in an unsolidified state until the first melt and the second melt merge.

3. The welding manufacturing method of the fluid filter assembly according to claim 2, characterized in that, Both the first high-energy beam and the second high-energy beam are pulsed laser beams; the single-pulse energy of the first high-energy beam when irradiating the first melt in S4 is lower than the single-pulse energy of the first high-energy beam when forming the first melt in S3.

4. The welding manufacturing method of the fluid filter assembly according to claim 1, characterized in that, During the welding process, a cooling jacket is installed on the outer periphery of the tube body to fit against the outer wall of the tube body, and a cooling mandrel is installed inside the joint to fit against the inner wall of the joint. The interference contact points between the cooling jacket and the cylindrical connector and the inner wall of the tube are arranged radially along the tube body, and the interference contact points between the cooling mandrel and the cylindrical connector and the outer wall of the joint are arranged radially along the tube body; the cooling jacket and the cooling mandrel are cooled by the cooling medium flowing inside them respectively. After welding, remove the cooling jacket and cooling mandrel.

5. The welding manufacturing method of the fluid filter assembly according to claim 1, characterized in that, When performing S3 and S4, argon gas is introduced into the assembly opening to place the two annular gaps, the first melt, and the second melt in an argon protective atmosphere.

6. The welding manufacturing method of the fluid filter assembly according to claim 1, characterized in that, The tube body and cylindrical connector are made of stainless steel, and the joint is made of copper.

7. The welding manufacturing method of the fluid filter assembly according to claim 1, characterized in that, Before performing S2, seal the filter bag opening to the end of the cylindrical connector away from the welding end; in S2, before pressing the connector together with the cylindrical connector into the tube, first place the filter bag into the tube through the assembly opening.

8. A fluid filtration assembly, characterized in that, It includes a tube body, a connector, a cylindrical connector, and a filter bag; the tube body, connector, and cylindrical connector are connected by the welding manufacturing method according to any one of claims 1 to 7, the filter bag is located inside the tube body, and the bag opening of the filter bag is sealed and fixed to the cylindrical connector.

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