A square and rectangular tube welding device and welding method

Abstract

This invention relates to the field of square and rectangular tube welding technology, and discloses a square and rectangular tube welding device and welding method. The welding device includes a deformable liquid bladder, which, when filled with heat-conducting liquid, flexibly wraps and positions two sets of square tubes and reinforcing components. An inlet pipe and an outlet pipe allow the heat-conducting liquid to continuously circulate within the deformable liquid bladder. The circulating heat-conducting liquid also regulates the temperature of the two sets of square tubes and reinforcing components in real time, preventing abnormal temperatures of the square tubes and reinforcing components from affecting the final welding effect. The welding method includes steps S1 to S5. This invention simultaneously achieves the flexible positioning function of the square tubes and the temperature regulation function before and after welding through the deformable liquid bladder. The interior of the deformable liquid bladder expands and circulates liquid, allowing for flexible positioning while also adjusting the temperature near the target weld seam through liquid circulation, thereby preventing temperature differences near the welding position from affecting the final welding result.

Description

Technical Field

[0001] This invention relates to the field of square and rectangular tube welding technology, and specifically to a square and rectangular tube welding device and welding method. Background Technology

[0002] Rectangular tubes are structures formed by welding square tubes together to form a rectangle, such as... Figure 6 As shown. Existing technology discloses a rectangular cuboid metal tube welding auxiliary device, application number CN202022481913.3, including a first positioning mechanism and a second positioning mechanism, with a locking shaft between the first and second positioning mechanisms; both ends of the locking shaft are equipped with locking caps; the second positioning mechanism includes a first stop mechanism and a second stop mechanism arranged vertically, with a connecting block between the front ends of the first stop mechanism and the second stop mechanism, through which the locking shaft passes; the locking caps are installed on the outer side of the connecting block; a first locking element is provided between one end of the first stop mechanism and one end of the connecting block, and a second locking element is provided between one end of the second stop mechanism and the other end of the connecting block; the first stop mechanism includes a stop plate. This application uses a locking groove to connect the ends of two adjacent metal tubes, thereby facilitating welding of the metal tubes by the welding machine and playing an auxiliary role in welding. However, the existing technology, especially this solution, still has the following problems:

[0003] When welding rectangular tubes, especially for rectangular tube structures with relatively high dimensional requirements and weld finish, some relatively precise welding processes are needed. Temperature is a particularly important factor in the welding process. Temperature gradients before and after welding can cause certain welding quality defects. The temperature of the material itself will affect the actual welding effect. Conversely, if the temperature of the material before and after welding is within a suitable and precise range, a relatively good welding effect can be obtained. Therefore, we need to propose a rectangular tube welding device and welding method. Summary of the Invention

[0004] The purpose of this invention is to provide a technical solution that simultaneously achieves the flexible positioning function of the square tube and the temperature regulation function before and after welding through a deformable liquid bladder, so as to solve the problems in the prior art mentioned in the background.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A square and rectangular tube welding device, the square and rectangular tube comprising reinforcing members and four sets of square tubes, including:

[0007] The base and support components are provided. Two sets of adjustable support seats are installed on the base via the support components. Support clamps and positioning clamps for holding four sets of square tubes are installed on the support seats. Rigid shells are provided at the four corners of the square and rectangular tubes on the support seats. Deformation liquid bladders are provided inside the rigid shells. The deformation liquid bladders are wrapped around the two sets of square tubes and the reinforcement components.

[0008] The deformable liquid bladder is externally equipped with a guide tube, which is connected to the deformable liquid bladder through multiple sets of connecting pipes. The guide tube is equipped with an inlet pipe and an outlet pipe. When the deformable liquid bladder is filled with heat-conducting liquid, it flexibly wraps and positions the two sets of square tubes and the reinforcement. The inlet pipe and outlet pipe allow the heat-conducting liquid to circulate continuously inside the deformable liquid bladder. The circulating heat-conducting liquid also adjusts the temperature of the two sets of square tubes and the reinforcement in real time, preventing abnormal temperature of the square tubes and the reinforcement from affecting the final welding effect.

[0009] Preferably, the deformable liquid bladder is configured as a heat-resistant liquid bladder structure, the cavity of the deformable liquid bladder is provided with a metal wire interlayer, and the heat-conducting liquid is configured as an oil-like heat-conducting liquid.

[0010] Preferably, the deformable liquid bladder includes an outer bladder, an inner bladder, and a bottom bladder that are interconnected. The outer bladder is supported on the outside of the included angle between the two sets of square tubes, the inner bladder is supported on the inside of the included angle between the two sets of square tubes, and the bottom bladder is supported at the bottom of the two sets of square tubes.

[0011] Preferably, a heat-conducting element is provided on the bottom bladder of the deformable liquid bladder. When the square tube is placed on the deformable liquid bladder, the heat-conducting element is attached to the square tube to obtain a better heat conduction effect.

[0012] Preferably, the rigid shell and the deformation liquid bladder are provided with relief grooves, which are used to make way for the reinforcement and locking components and other accessory structures, so that the deformation liquid bladder can better fit the rectangular tube.

[0013] Preferably, the square and rectangular tubes to be welded include a reinforcing member, a handle, and four sets of square tubes. The four sets of square tubes are joined end to end. Two sets of square tubes are first welded together through the target weld at the top to form a rigid connection, which facilitates subsequent welding operations. The reinforcing member needs to be welded between the two sets of square tubes.

[0014] Preferably, both the support clamp and the positioning clamp are adjustable and movable on the support base, and are driven by a linear telescopic member.

[0015] Preferably, the support clamp and the positioning clamp are mounted on the support base via supports, and the rigid housing is mounted on the support base via supports of the support clamp.

[0016] Preferably, the support clamp includes support clamp one and support clamp two, and the positioning clamp includes positioning clamp one and positioning clamp two. Support clamp one is used to clamp the middle section of each group of square tubes, and positioning clamp two is used to abut and align the ends of each group of square tubes. Under the combined clamping of support clamp one and positioning clamp two, the four groups of square tubes form a basic square structure of rectangular tubes.

[0017] The present invention also provides a welding method for a square and rectangular tube welding device, comprising the following steps:

[0018] Step S1: Pre-positioning of the workpiece and adjustment of the fixture; Step S2: Flexible positioning of the deformation liquid bladder; Step S3: Dynamic temperature control; Step S4: Multi-pass welding; Step S5: Post-processing and quality inspection.

[0019] Technical effects and advantages of the present invention: Compared with the prior art, the square and rectangular tube welding device and welding method proposed in this invention have the following advantages:

[0020] This invention achieves both flexible positioning of the square tube and temperature regulation before and after welding through a deformation liquid bladder. The deformation liquid bladder is set inside a rigid shell. The liquid inside the deformation liquid bladder expands and circulates. The two sets of square tubes are first positioned by multiple clamps, and then flexibly positioned by the deformation liquid bladder on the rigid shell. While flexibly positioning, the temperature near the target weld can be adjusted by the liquid circulation inside the deformation liquid bladder, thereby preventing temperature differences near the welding position from affecting the final welding result. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural schematic diagram of the square and rectangular tube welding device of the present invention;

[0022] Figure 2 For the present invention Figure 1 Enlarged structural diagram at point A;

[0023] Figure 3 This is a top view schematic diagram of the square and rectangular tube welding device of the present invention;

[0024] Figure 4 For the present invention Figure 3 Enlarged structural diagram at point B;

[0025] Figure 5 This is a partial structural diagram of the rigid shell, deformable liquid bladder, and rectangular tube of the present invention;

[0026] Figure 6 This is a schematic diagram of the rectangular tube structure of the present invention;

[0027] Figure 7 For the present invention Figure 6Enlarged structural diagram at point C;

[0028] Figure 8 This is a schematic diagram of the specific structure of the rigid shell and the deformable liquid bladder of the present invention.

[0029] In the picture:

[0030] 11. Support base; 12. Support component; 13. Support clamp one; 14. Positioning clamp one; 15. Positioning clamp two; 16. Support clamp two; 21. Rigid outer shell; 22. Deformable liquid bladder; 23. Guide tube; 24. Inlet tube; 25. Outlet tube; 26. Connecting tube; 27. Relief groove; 28. Outer bladder component; 29. ​​Inner bladder component; 210. Bottom bladder component; 211. Cavity; 212. Heat-conducting component; 31. Square tube; 32. Reinforcing component; 33. Handle component; 34. Connecting component; 35. Locking component; 36. Target weld. Detailed Implementation

[0031] The subject matter described herein will now be discussed with reference to exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and implement the subject matter described herein, and changes may be made to the function and arrangement of the elements discussed without departing from the scope of this specification. Various processes or components may be omitted, substituted, or added as needed in the examples. Furthermore, features described in some examples may be combined in other examples.

[0032] The invention provides, for example Figures 1 to 8 As shown, a rectangular tube welding device is provided, wherein the rectangular tube includes a reinforcing member 32 and four sets of rectangular tubes 31, comprising:

[0033] The base and support member 12 are provided. Two sets of adjustable support seats 11 are installed on the base via the support member 12. Support clamps and positioning clamps for holding four sets of square tubes 31 are installed on the support seat 11. Rigid shells 21 are provided at the four corners of the square tubes on the support seat 11. Deformation liquid bladders 22 are provided inside the rigid shells 21. The deformation liquid bladders 22 are wrapped around the two sets of square tubes 31 and the reinforcement members 32.

[0034] The deformable liquid bladder 22 is provided with a guide pipe 23 on its outside. The guide pipe 23 is connected to the deformable liquid bladder 22 through multiple sets of connecting pipes 26. The guide pipe 23 is provided with an inlet pipe 24 and an outlet pipe 25. When the deformable liquid bladder 22 is filled with heat-conducting liquid, it flexibly wraps and positions the two sets of square tubes 31 and the reinforcement 32. The inlet pipe 24 and the outlet pipe 25 enable the heat-conducting liquid to circulate continuously inside the deformable liquid bladder 22. The circulating heat-conducting liquid also adjusts the temperature of the two sets of square tubes 31 and the reinforcement 32 in real time to prevent abnormal temperature of the square tubes 31 and the reinforcement 32 from affecting the final welding effect.

[0035] Working principle: The deformation liquid bladder 22 simultaneously realizes the flexible positioning function of the square tube 31 and the temperature regulation function before and after welding. The deformation liquid bladder 22 is set inside the rigid shell 21. The inside of the deformation liquid bladder 22 expands and circulates liquid. The two sets of square tubes 31 of the rectangular tube are first positioned by multiple clamps, and then flexibly positioned by the deformation liquid bladder 22 on the rigid shell 21. While flexibly positioning, the temperature near the target weld 36 can also be adjusted by the liquid circulation inside the deformation liquid bladder 22, thereby preventing the temperature difference near the welding position from affecting the final welding result.

[0036] The temperature anomaly mentioned above refers to the excessively high or low temperature of the square and rectangular tube material itself during welding. Specifically, a low temperature defect results in reduced molten pool fluidity and a decreased weld depth-to-width ratio; an excessively high temperature defect results in coarsening of the grains in the heat-affected zone of the base material, leading to a decrease in the tensile strength of the weld, non-uniform thermal expansion between the reinforcement 32 and the square tube 31, and an increase in misalignment. It should be noted that the temperature anomaly here refers to the temperature of the square and rectangular tube before and after welding, not the welding temperature. The optimal temperature range for the square and rectangular tube before and after welding is 180℃-250℃. Therefore, when the temperature of the square and rectangular tube before and after welding is not within this temperature range, it is interpreted as a temperature anomaly.

[0037] To ensure that the temperature of the rectangular tube remains within a suitable range by the deformation liquid bladder 22 and the internal heat-conducting liquid, the deformation liquid bladder 22 is configured as a heat-resistant liquid bladder structure. The cavity 211 of the deformation liquid bladder 22 is provided with a metal wire interlayer. The heat-conducting liquid is configured as an oil-like heat-conducting liquid. To improve the heat conduction effect, iron powder may be appropriately added to the heat-conducting liquid.

[0038] like Figure 7 and Figure 8 As shown, the deformable liquid bladder 22 includes an outer bladder 28, an inner bladder 29, and a bottom bladder 210 that are interconnected. The outer bladder 28 is supported on the outside of the included angle of the two sets of square tubes 31, the inner bladder 29 is supported on the inside of the included angle of the two sets of square tubes 31, and the bottom bladder 210 is supported on the bottom of the two sets of square tubes 31.

[0039] like Figure 8 As shown, a heat-conducting component 212 is provided on the bottom bladder 210 of the deformable liquid bladder 22. When the square tube 31 is placed on the deformable liquid bladder 22, the heat-conducting component 212 is attached to the square tube 31 to obtain a better heat conduction effect. Specifically, the heat-conducting component 212 is a metal component.

[0040] like Figures 6 to 7 As shown, the square and rectangular tubes to be welded include a reinforcing member 32, a handle 33, and four sets of square tubes 31. The four sets of square tubes 31 are joined end-to-end, and the specific joining method is as follows: Figure 7As shown, the two sets of square tubes 31 are first welded together through the target weld seam 36 at the top to form a rigid connection, which facilitates subsequent welding operations. The reinforcement 32 needs to be welded between the two sets of square tubes 31. This welding device is for the welding operation of the target weld seam 36 at the top and the welding operation between the reinforcement 32 and the square tube 31.

[0041] like Figure 6 As shown, the rectangular tube further includes specific accessories such as handle 33, connector 34 and locking member 35, and multiple sets of clamps are correspondingly set for these accessories.

[0042] like Figure 2 and Figure 3 As shown, specifically, both the support clamp and the positioning clamp are designed to be movable and adjustable on the support base 11. The support clamp includes support clamp one 13 and support clamp two 16, and the positioning clamp includes positioning clamp one 14 and positioning clamp two 15. Support clamp one 13 is used to clamp the middle section of each group of square tubes 31, and positioning clamp two 15 is used to abut and align the ends of each group of square tubes 31. Under the combined clamping of support clamp one 13 and positioning clamp two 15, the four groups of square tubes 31 form a basic square structure of rectangular tubes.

[0043] The support clamp and positioning clamp are driven by a linear telescopic member. The support clamp and positioning clamp are mounted on the support base 11 by a support. The rigid shell 21 can be mounted on the support base 11 by a specific support or by the support of the support clamp (not shown in the figure).

[0044] like Figures 2 to 6 As shown, positioning clamp 14 is for handle 33, and positioning clamp 14 abuts against handle 33 from one side. Positioning clamp 2 15 is for connector 34, and positioning clamp 2 15 abuts against connector 34 from the other side. The welding operation of handle 33 and connector 34 is performed before the welding operation of square tube 31. This welding device is not for welding these structures.

[0045] like Figure 7 and Figure 8 As shown, the rigid outer shell 21 and the deformable liquid bladder 22 are provided with relief grooves 27. The relief grooves 27 are used to make way for the reinforcement 32 and the locking member 35 and other accessory structures, so that the deformable liquid bladder 22 can better fit the rectangular tube. Specifically, there are several relief grooves 27 of different sizes, which respectively make way for the reinforcement 32 and the locking member 35.

[0046] Example 2: Based on Example 1, this application also provides a welding method for a square and rectangular tube welding device, comprising the following steps:

[0047] Step S1, workpiece pre-positioning and fixture adjustment: Adjust the spacing of support base 11: According to the length of the square tube, adjust the spacing of the two sets of support base 11 through the linear slide rail of support member 12; Install the basic fixture: Use support fixture 13 to clamp the middle section of four sets of square tubes 31; Use positioning fixture 2 15 to press against the end of the square tube 31 to ensure the end face is flush; Fix the handle 33 through positioning fixture 14 and apply lateral positioning force;

[0048] Step S2, Flexible positioning of the deformation liquid bladder 22: The liquid bladder is filled and positioned by injecting heat-conducting oil into the deformation liquid bladder 22 through the liquid inlet pipe 24; the filling pressure is controlled so that the outer bladder 28, inner bladder 29, and bottom bladder 210 respectively fit the included angle of the square tube 31; the deformation constraint is enhanced by using a metal wire interlayer; the clearance structure is adapted: the alignment deviation between the clearance groove 27 and the reinforcement 32 and locking part 35 is confirmed; the heat-conducting part 212 of the bottom bladder 210 is adjusted to ensure contact with the bottom surface of the square tube 31;

[0049] Step S3, Dynamic Temperature Control: The pre-welding temperature is balanced, and the heat transfer liquid circulation system is started; turbulence is generated through the spiral guide vanes of the guide tube 23; the surface temperature of the square tube 31 is monitored by an infrared thermometer, and the liquid inlet temperature is adjusted to stabilize the workpiece within a certain range.

[0050] Step S4, multi-pass welding implementation: Top weld welding, using TIG welding process, the first weld is performed along the target weld 36, while keeping the internal temperature fluctuation of the liquid bladder within a certain range; welding heat is discharged through the guide tube 23; reinforcement 32 welding: the angle of the welding gun is adjusted to perform fillet weld welding between the reinforcement 32 and the square tube 31; heat dissipation is enhanced by using the heat-conducting component 212 of the bottom bladder component 210;

[0051] Step S5, Post-processing and quality inspection: Gradient cooling, maintaining liquid circulation after welding and cooling at a stable rate; enhancing the residual stress release effect by adding iron powder to the heat-conducting liquid; Deformation monitoring, depressurizing and emptying the deformation liquid bladder 22, using a laser scanner to detect the straightness of the square tube 31, and checking the weld integrity in the relief groove 27 area.

[0052] In summary, this solution also has the following combined effects: a dual-stage positioning mechanism, with rigid clamps for pre-positioning, forming a basic square frame through support clamp 13 (mid-section clamping) and positioning clamp 25 (end-end clamping and alignment), ensuring the geometric accuracy of the four sets of square tubes 31; flexible positioning of the deformation liquid bladder 22, which expands upon filling, and after the heat-conducting liquid is injected into the deformation liquid bladder 22 (outer bladder 28, inner bladder 29, bottom bladder 210), the liquid pressure adaptively wraps the included angle of the square tube 31 and the reinforcement member 32; and a metal wire clamp. Layered constraint: The metal mesh inside cavity 211 restricts excessive deformation of the liquid bladder, achieving radial positioning accuracy; dynamic temperature control: preheating before welding is achieved by introducing heat transfer oil through inlet pipe 24 to circulate and heat the square tube 31 to the initial temperature range; post-weld dissipation: a low-temperature medium is used in the high-temperature zone, forming turbulence through the spiral guide vanes of guide pipe 23 to improve heat exchange efficiency; the metal heat-conducting component 212 of bottom bladder 210 directly contacts the bottom surface of square tube 31 to enhance local heat dissipation; structural adaptability design: the clearance groove 27 is matched, and the rigid shell... The clearance groove 27 on the deformable liquid bladder 22 precisely avoids the reinforcement 32 and locking element 35, ensuring the fit between the liquid bladder and the square tube 31; positioning accuracy and stability are improved, with the rigid fixture (support fixture 13 / positioning fixture 25) and the flexible liquid bladder (deformable liquid bladder 22) working together to minimize the overall positioning error; the metal wire interlayer inhibits the creep of the liquid bladder, ensuring positioning stability during welding; welding quality is optimized, and temperature uniformity is controlled by circulating heat-conducting liquid to keep the temperature difference in the welding area within a certain range. The heat-affected zone width is reduced; the weld strength is improved, avoiding grain coarsening caused by abnormal temperature, and the tensile strength of the weld is enhanced; structural compatibility and efficiency are improved, and the design of the positioning groove 27 supports welding of multiple specifications of accessories (reinforcement parts 32 and locking parts 35), shortening the changeover time; the liquid bladder partition structure (outer bladder, inner bladder, bottom bladder) is adapted to irregular cross-sections; reliability is enhanced, the temperature-resistant liquid bladder material has a wide temperature tolerance range and a long cycle life; the metal heat-conducting part 212 and the iron powder doped liquid work together to improve heat dissipation efficiency compared to pure liquid.

[0053] The embodiments of the present invention have been described above, but the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention, all of which are within the protection scope of the present invention.

Claims

1. A square and rectangular tube welding device, wherein the square and rectangular tube includes a reinforcing member (32) and four sets of square tubes (31), characterized in that, include: The base and support (12) are provided. Two sets of adjustable support seats (11) are installed on the base via the support (12). Support clamps and positioning clamps for clamping four sets of square tubes (31) are installed on the support seats (11). Rigid shells (21) are provided at the four corners of the square tubes on the support seats (11). Deformation liquid bladders (22) are provided inside the rigid shells (21). The deformation liquid bladders (22) are wrapped around the two sets of square tubes (31) and the reinforcement (32). The deformable liquid bladder (22) is provided with a flow guide pipe (23) on its outside. The flow guide pipe (23) is connected to the deformable liquid bladder (22) through multiple sets of connecting pipes (26). The flow guide pipe (23) is provided with an inlet pipe (24) and an outlet pipe (25). When the deformable liquid bladder (22) is filled with heat-conducting liquid, it flexibly wraps and positions the two sets of square tubes (31) and the reinforcement (32). The inlet pipe (24) and the outlet pipe (25) make the heat-conducting liquid continuously circulate inside the deformable liquid bladder (22). The circulating heat-conducting liquid also adjusts the temperature of the two sets of square tubes (31) and the reinforcement (32) in real time to prevent the abnormal temperature of the square tubes (31) and the reinforcement (32) from affecting the final welding effect.

2. The square and rectangular tube welding device according to claim 1, characterized in that, The deformable liquid bladder (22) is configured as a heat-resistant liquid bladder structure, and a metal wire sandwich is provided inside the cavity (211) of the deformable liquid bladder (22), and the heat-conducting liquid is configured as an oil-like heat-conducting liquid.

3. The square and rectangular tube welding device according to claim 2, characterized in that, The deformable liquid bladder (22) includes an outer bladder (28), an inner bladder (29), and a bottom bladder (210) that are interconnected. The outer bladder (28) is supported on the outside of the included angle of the two sets of square tubes (31), the inner bladder (29) is supported on the inside of the included angle of the two sets of square tubes (31), and the bottom bladder (210) is supported on the bottom of the two sets of square tubes (31).

4. The square and rectangular tube welding device according to claim 3, characterized in that, A heat-conducting element (212) is provided on the bottom bladder (210) of the deformable liquid bladder (22). When the square tube (31) is placed on the deformable liquid bladder (22), the heat-conducting element (212) fits into the square tube (31) to obtain a better heat conduction effect.

5. The square and rectangular tube welding device according to claim 4, characterized in that, The rigid shell (21) and the deformable liquid bladder (22) are provided with relief grooves (27), which are used to make way for the reinforcement (32) and the locking member (35) so that the deformable liquid bladder (22) fits the rectangular tube better.

6. The square and rectangular tube welding device according to claim 1, characterized in that, The square and rectangular tubes to be welded include a reinforcement (32), a handle (33), and four sets of square tubes (31). The four sets of square tubes (31) are connected end to end. The two sets of square tubes (31) are first welded together through the target weld (36) at the top to form a rigid connection, which facilitates subsequent welding operations. The reinforcement (32) needs to be welded between the two sets of square tubes (31).

7. A square and rectangular tube welding device according to claim 6, characterized in that, Both the support clamp and the positioning clamp are configured to be movable and adjustable on the support base (11), and the support clamp and the positioning clamp are driven by a linear telescopic member.

8. The square and rectangular tube welding device according to claim 7, characterized in that, The support clamp and positioning clamp are mounted on the support base (11) via supports, and the rigid shell (21) is mounted on the support base (11) via the supports of the support clamp.

9. A square and rectangular tube welding device according to claim 8, characterized in that, The support clamp includes support clamp one (13) and support clamp two (16), and the positioning clamp includes positioning clamp one (14) and positioning clamp two (15). Support clamp one (13) is used to clamp the middle section of each group of square tubes (31), and positioning clamp two (15) is used to press and align the ends of each group of square tubes (31). Under the combined clamping of support clamp one (13) and positioning clamp two (15), the four groups of square tubes (31) form a basic square structure of rectangular tubes.

10. A welding method for a square and rectangular tube welding apparatus according to any one of claims 1-9, characterized in that, The process includes the following steps: Step S1, workpiece pre-positioning and fixture adjustment; Step S2, flexible positioning of the deformation liquid bladder; Step S3, dynamic temperature control; Step S4, multi-pass welding; Step S5, post-processing and quality inspection.

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