A method and structure for connecting a first profile and a second profile

Abstract

The present invention discloses a connection method and a connection structure between a first profile and a second profile. A first profile through hole and a flange structure are pre-punched out of the first profile, and the second profile is welded to the first profile by two welding methods. The flange structure embedded in the second profile is used to improve the axial tensile strength of the second profile and the first profile along the through hole of the first profile, and the second profile protrusion formed in the through hole of the first profile is used to improve the radial tensile strength of the second profile and the first profile along the through hole of the first profile. The flange structure and the first profile are an integrated structure, and the second profile protrusion and the second profile are an integrated structure, which further improves the stability of the connection between the first profile and the second profile, reduces the use of consumables, and helps to reduce costs.

Description

Technical Field

[0001] The present invention relates to the technical field of profile welding, and in particular to a connection method and a connection structure between a first profile and a second profile. Background Art

[0002] In the field of automobile bodies, it is often necessary to connect a second profile to a first profile. In the prior art, rivets are often used for mechanical connection. During operation, the mechanical force generated by a riveting gun presses the rivet into the first profile and the second profile to achieve connection.

[0003] Since the first profile and the second profile are mainly connected by rivets, and the rivets are parts independent of the first profile, there is a risk of rivets coming off during long-term use, especially after being subjected to vibration. When welding, a welding gun with a riveting function is required, but the welding gun is expensive and rivets are consumables, which is not conducive to cost saving.

[0004] In view of this, it is necessary to provide a novel connection method and connection structure between the first profile and the second profile. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a new method and structure for connecting a first profile and a second profile. A first profile through hole and a flange structure are pre-punched out in the first profile. After welding is completed, the flange structure is embedded in the second profile, and a second profile protrusion fused to the first profile is also formed in the first profile through hole, thereby improving the stability of the connection structure, facilitating operation, reducing the use of consumables, and reducing costs.

[0006] The technical solution of the present invention provides a method for connecting a first profile and a second profile, wherein the melting point of the first profile is higher than the melting point of the second profile;

[0007] The steps include:

[0008] S01: pre-marking a first welding area on a first profile, punching a first profile through hole in the first welding area, and forming a circle of flange structure on one side of the first welding area, wherein the flange structure surrounds an end opening of the first profile through hole;

[0009] S02: positioning the second profile and the first profile on a welding tool, and making the surface of the second welding area of ​​the second profile contact with the flanging structure;

[0010] S03: disposing a first electrode on a side of the first welding region facing away from the flange structure, wherein the first electrode has a first cooling channel, and the first electrode covers the other end opening of the first profile through hole;

[0011] A second electrode is arranged on a side of the second welding region facing away from the first profile, the second electrode has a second cooling channel, and the second electrode is in contact with the second profile;

[0012] S04: applying a first current I1 and a first pressure F1 within a first time period T1, the second welding area gradually softens, the flange structure is inserted into the second welding area, and the second profile is fitted with the first profile;

[0013] S05: applying a second current I2 and a second pressure F2 in a second time period T2, wherein the second pressure F2 is greater than the first pressure F1, and under the action of the second pressure F2, the flange structure is bent and deformed toward the first profile side, and the distance between the end of the flange structure and the through hole of the first profile increases;

[0014] The second current I2 is greater than the first current I1, the second welding area continues to soften, and the second profile solution is formed by melting the side of the second welding area facing the first profile, at least part of the second profile solution is pressed into the through hole of the first profile, and the second welding area is welded to the first welding area;

[0015] S06: After a preset cooling period, the flange structure is fixedly connected to the second profile, and the second profile protrusion formed in the through hole of the first profile is fixedly connected to the first profile.

[0016] In one of the optional technical solutions, the through hole of the first profile is a circular hole, the first electrode has a first spherical convex portion, and the second electrode has a second spherical convex portion;

[0017] Wherein, the first spherical convex portion, the first profile through hole and the second spherical convex portion are coaxially arranged.

[0018] In one of the optional technical solutions, 0.3KA≤I1<15KA, 0.5KN≤F1≤1.2KN; 15KA≤I2≤40KA, 4KN≤F1≤10KN.

[0019] In one of the optional technical solutions, when punching the flange structure, the flange structure is punched into a trumpet shape.

[0020] In one of the optional technical solutions, the flange structure is an outwardly expanding arc structure.

[0021] In one of the optional technical solutions, after the flanging structure is formed by punching, a tip is formed at the end of the flanging structure by grinding.

[0022] In one of the optional technical solutions, the thickness of the flanging structure gradually becomes thinner along the direction from the root to the end of the flanging structure.

[0023] In one of the optional technical solutions, the first profile has a plurality of the first welding areas arranged at intervals along the length direction, and correspondingly, the second profile has a plurality of the second welding areas arranged at intervals along the length direction;

[0024] Punching out a first profile through hole and the flange structure in each of the first welding regions;

[0025] During welding, each of the flange structures is inserted into the welding area of ​​the second profile, and each through hole of the first profile is filled with the second profile solution;

[0026] After welding is completed, each of the flange structures is embedded in the second profile, and a second profile protrusion is formed in each through hole of the first profile.

[0027] In one of the optional technical solutions, the first welding area and the second welding area are welded in sequence along a preset order; or,

[0028] The plurality of first welding regions and the plurality of second welding regions are welded synchronously.

[0029] The technical solution of the present invention further provides a connection structure between a first profile and a second profile, wherein the melting point of the first profile is higher than the melting point of the second profile;

[0030] The first welding area of ​​the first profile has a first profile through hole, and a circle of flange structure is formed on one side of the first welding area, and the flange structure surrounds an end opening of the first profile through hole;

[0031] The first profile and the second profile are connected by using the method for connecting the first profile and the second profile described in any of the above technical solutions;

[0032] The flange structure is embedded in the second welding area of ​​the second profile and is fixedly connected to the second profile;

[0033] A second profile protrusion is embedded in the through hole of the first profile, and the second profile protrusion is fixedly connected to the first profile.

[0034] The above technical solution has the following beneficial effects:

[0035] The first profile through hole and the flange structure are pre-punched out in the first profile, and the second profile is welded to the first profile by two welding methods. During the first welding, a smaller current is used to heat and soften the second welding area so that the flange structure can be completely inserted into the softened second welding area. Next, the second welding is performed, and a larger current and pressure are applied. Under the top pressure of the second profile, the flange structure bends and deforms to increase the radial dimension, and the second welding area continues to soften. The side facing the first profile melts to form a second profile solution, and the second profile solution will be pressed into the through hole of the first profile. During the second welding process, the contact surfaces of the first welding area and the second welding area are welded. After cooling for a preset time, the flange structure embedded in the second profile is fixedly connected to the second profile, and the second profile protrusion formed in the through hole of the first profile is also fixedly connected to the first profile.

[0036] In summary, the connection method between the first profile and the second profile provided by the present invention and the flange structure embedded in the second profile are used to improve the axial tensile strength of the second profile and the first profile along the through hole of the first profile, and the second profile protrusion formed in the through hole of the first profile is used to improve the radial tensile strength of the second profile and the first profile along the through hole of the first profile.

[0037] In the method for connecting the first profile and the second profile provided by the present invention, the flange structure and the first profile are an integrated structure, and the second profile protrusion and the second profile are an integrated structure, which further improves the stability of the connection between the first profile and the second profile.

[0038] The connection method and connection structure of the first profile and the second profile provided by the present invention reduce the use of consumables and help reduce costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The disclosure of the present invention will become more easily understood with reference to the accompanying drawings. It should be understood that these drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present invention. In the drawings:

[0040] Figure 1 A cross-sectional view of a first profile used in a method for connecting a first profile with a second profile provided in one embodiment of the present invention;

[0041] Figure 2 A cross-sectional view of a second profile used in a method for connecting a first profile and a second profile provided in an embodiment of the present invention;

[0042] Figure 3 A schematic diagram of punching out a first profile through hole and a flange structure in a first welding area;

[0043] Figure 4 A schematic diagram of placing a first profile and a second profile together, wherein the welding tool is omitted;

[0044] Figure 5 A schematic diagram showing that a first electrode is arranged on a first profile and a second electrode is arranged on a second profile;

[0045] Figure 6 A schematic diagram of the flanging structure being inserted into the second welding area during the first stage of the welding process;

[0046] Figure 7 is a schematic diagram of a first profile through-hole being filled with a second profile solution during a second stage of welding;

[0047] Figure 8 A cross-sectional view of the second profile and the first profile that have been connected;

[0048] Fig. 9 It is a cross-sectional view of the flange structure in the initial state;

[0049] Fig.10 It is a cross-sectional view of the flange structure when it is in a compressed and deformed state;

[0050] Fig.11 is a schematic diagram of a first electrode having a first cooling channel;

[0051] Fig.12 Schematic diagram of a second electrode having a second cooling channel. DETAILED DESCRIPTION

[0052] The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings. The same components are represented by the same reference numerals. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the accompanying drawings, and the words "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0053] like Figure 1-12 As shown, an embodiment of the present invention provides a method for connecting a first profile and a second profile, wherein the melting point of the first profile is higher than the melting point of the second profile.

[0054] The steps include:

[0055] S01: Pre-mark a first welding area 11 on the first profile 1, punch out a first profile through hole 12 in the first welding area 11, and form a circle of flange structure 13 on one side of the first welding area 11, the flange structure 13 surrounds one end opening of the first profile through hole 12.

[0056] S02 : Position the second profile 2 and the first profile 1 on the welding tool, and make the surface of the second welding area 21 of the second profile 2 contact with the flanging structure 13 .

[0057] S03: A first electrode 3 is arranged on a side of the first welding region 11 facing away from the flange structure 13 . The first electrode 3 has a first cooling channel 31 . The first electrode 3 covers the other end opening of the first profile through hole 12 .

[0058] A second electrode 4 is arranged on the side of the second welding region 21 facing away from the first profile 1 . The second electrode 4 has a second cooling channel 41 therein and is in contact with the second profile 2 .

[0059] S04: applying the first current I1 and the first pressure F1 within the first time period T1, the second welding area 21 gradually softens, the flange structure 13 is inserted into the second welding area 21, and the second profile 2 fits with the first profile 1.

[0060] S05: A second current I2 and a second pressure F2 are applied in a second time period T2, wherein the second pressure F2 is greater than the first pressure F1. Under the action of the second pressure F2, the flange structure 13 is bent and deformed toward the first profile 1, and the distance between the end 131 of the flange structure 13 and the through hole 12 of the first profile increases.

[0061] The second current I2 is greater than the first current I1 , and the second welding area 21 melts on the side facing the first profile 1 to form a second profile solution 22 , and at least part of the second profile solution 22 is pressed into the first profile through hole 12 , so that the second welding area 21 is welded to the first welding area 11 .

[0062] S06: After a preset cooling period, the flange structure 13 is fixedly connected to the second profile 2 , and the second profile protrusion 23 formed in the first profile through hole 12 is fixedly connected to the first profile 1 .

[0063] The method for connecting a first profile and a second profile provided by the present invention is used to connect a first profile 1 and a second profile 2 with different melting points. The first profile 1 can be selected from a steel plate or steel material, and its melting point is about 1500°C. The second profile 2 can be selected from an aluminum plate or aluminum material, and its melting point is about 600°C.

[0064] The first profile 1 and the second profile 2 are welded together using a two-stage welding method, as follows:

[0065] Step 1: First, plan the first welding area 11 on the first profile 1. Then, use a stamping tool to punch out the first profile through hole 12 in the first welding area 11, and at the same time, form a circle of flange structure 13 on the welding side of the first welding area 11 facing the second profile 2, and the flange structure 13 surrounds one end opening of the first profile through hole 12. The flange structure 13 is an integrated structure with the first profile 1, and is directly formed by the stamped steel sheet when punching the first profile through hole 12. The flange structure 13 is thinner than the first profile 1 and can be bent by the second profile 2.

[0066] Specifically, a sleeve and a piston mechanism can be used to punch the first profile through hole 12. The sleeve is placed at the bottom of the first welding area 11, and the piston impacts the first profile 2 from top to bottom, thereby forming the first profile through hole 12. When punching the first profile through hole 12, the steel sheet protrudes downward in the sleeve, and the steel sheet remains connected to the first profile. According to actual needs, the middle part of the steel sheet can be cut off to form an annular structure. Then a conical or trapezoidal reamer is used to act on the steel sheet with the annular structure, so that it forms a flange structure 13 that extends obliquely around the first profile through hole 12.

[0067] Step 2: Position the second profile 2 and the first profile 1 on a welding tool, which has a clamp to clamp the second profile 2 and the first profile 1. The welding tool is an existing device and will not be described in detail here.

[0068] The area of ​​the second profile 2 corresponding to the first welding area 11 is the second welding area 21. The surface of the second welding area 21 is in contact with the flange structure 13. According to actual needs, the second profile 2 can be above the first profile 1 or below the first profile 1. Preferably, the second profile 2 is arranged below the first profile 1, and under the pressure and the gravity of the first profile 1, it is convenient to insert the flange structure 13 into the molten second welding area 21 in subsequent operations, and it is also convenient for the second profile solution to flow into the first profile through hole 12.

[0069] Step 3: Arrange electrodes to provide current, and apply pressure to the first profile 1 and the second profile 2 through the electrodes. Specifically, a first electrode 3 is arranged on the first welding area 11, and the first electrode 3 is located on the non-welding side of the first welding area 11, that is, the first electrode 3 and the flange structure 13 are located on opposite sides of the first welding area 11. The first electrode 3 covers the opening of the first profile through hole 12, and can also prevent the second profile solution pressed into the first profile through hole 12 from splashing out. The first electrode 3 has a first cooling channel 31 for the circulation of cooling liquid (such as water), so that the surface temperature of the first electrode 3 will not be too high, which can prevent the non-welding side of the first profile 1 from being too high, so as to improve the safety of operation.

[0070] A second electrode 4 is disposed on the second welding region 21, and the second electrode 4 contacts the second profile 2. The second electrode 4 is located on the non-welding side of the second welding region 21, that is, the second electrode 4 is located on the side of the second welding region 21 facing away from the first profile 1. The second electrode 4 has a second cooling channel 41 for circulating a cooling liquid (such as water), so that the surface temperature of the second electrode 4 will not be higher than the melting point of the second profile 2, thereby preventing the non-welding side of the second profile 2 from melting and improving the safety of the operation.

[0071] The first electrode 3 and the second electrode 4 are controlled by separate cooling liquid supply channels to achieve corresponding surface temperature control.

[0072] The polarity of the second electrode 4 is opposite to that of the first electrode 3. If the first electrode 3 is positive, the second electrode 4 is negative. If the first electrode 3 is negative, the second electrode 4 is positive.

[0073] The center line of the first electrode 3 and the second electrode 4 is the current flow path. The temperature of the local area where the center line of the first electrode 3 and the second electrode 4 is located is the highest. The farther away from the above center line, the lower the temperature of the second profile 2. The softening area and the melting area of ​​the second profile 2 are both around the center line of the first electrode 3 and the second electrode 4. The temperature required for softening the second profile 2 is relatively low, and the softening area is relatively large. The temperature required for melting the second profile 2 is relatively high, and the melting area is relatively small. The end 131 of the flanging structure 13 is generally in the softening area of ​​the second profile 2. The area where the second profile 2 is directly opposite to the through hole 12 of the first profile and whose area is slightly larger than the through hole 12 of the first profile is generally the melting area.

[0074] In the present invention, the external input power source is an alternating current with a frequency of 50 Hz, and the welding current finally output to the welding material can be an alternating current or a direct current. The first profile 1 and the second profile 2 are heated by the current to soften or melt the second welding region 21 .

[0075] Step 4: The first stage of welding is to insert the flange structure 13 into the second welding area 21 .

[0076] Specifically, the first current I1 is supplied to the first electrode 3 and the second electrode 4, and the first profile 1 and the second profile 2 are respectively pressed by the first electrode 3 and the second electrode 4, with a pressure of F1. The power supply time and the pressure application time are T1. Of course, if necessary, after the power supply is stopped, the pressure can continue to be applied to the first profile 1 and the second profile 2.

[0077] In the first stage of the welding operation, under the heating effect of the electric current, the heating temperature has not yet reached the melting point of the second profile 2. If the second profile 2 is an aluminum plate or aluminum material, the heating temperature is between 300° C. and 660° C. Under the effect of the heating temperature, the second welding area 21 gradually softens, and the flange structure 13 is easier to insert into the second welding area 21.

[0078] At the end of the first stage welding operation, the second profile 2 is completely fitted with the first profile 1, and the flange structure 13 is completely inserted into the second welding area 21. During the first stage welding operation, the flange structure 13 can be slowly inserted into the second welding area 21.

[0079] Step 5: The second stage of welding is to bend the flange structure 13 and form a second profile protrusion 23 in the first profile through hole 12.

[0080] Specifically, a second current I2 is provided to the first electrode 3 and the second electrode 4, and I2 is greater than I1. At the same time, the first profile 1 and the second profile 2 are respectively pressed by the first electrode 3 and the second electrode 4, and the pressure is F2, and F2 is greater than F1. The power supply time and the pressure application time are T2. Of course, if necessary, after the power supply is stopped, the pressure can continue to be applied to the first profile 1 and the second profile 2.

[0081] The welding side of the second welding area 21 continues to soften or melt, and the second pressure F2 can be transmitted to the flanging structure 13 from the non-welding side or unsoftened area of ​​the second profile 2, so that the flanging structure 13 is pressed and bent toward the first profile 1 side. The distance between the end 131 of the flanging structure 13 and the first profile through hole 12 is increased, thereby increasing the lateral dimension of the flanging structure 13 in the second welding area 21 (along the radial direction of the first profile through hole 12), which is beneficial to improving the axial tensile strength of the second profile 2 and the first profile 1 along the first profile through hole 12.

[0082] During the second stage of welding, a second pressure F2 may be instantly applied to the first profile 1 and the second profile 2 to deform the flange structure 13 .

[0083] In the second stage of the welding operation, the current is relatively large, and the heating temperature is higher than the melting point of the second profile 2. If the second profile 2 is an aluminum plate or aluminum material, the heating temperature is between 600°C and 700°C. Under the action of high temperature, the welding side of the second welding area 21 continues to soften until it melts to form a second profile solution 22. After the flanging structure 13 is deformed, pressure can continue to be applied to the second profile 2 and the first profile 1. Under the action of pressure, the second profile solution 22 will be pressed into the first profile through hole 12 due to pressure. In the process of the second profile solution 22 entering the first profile through hole 12, the flanging structure 13 plays a guiding role. Generally, the welding area of ​​the second welding area 21 is within the range of the flanging structure 13.

[0084] The second profile solution 22 entering the first profile through hole 12 forms a second profile bump 23 after cooling. In this process, the second profile 2 undergoes a phase change, and the hardness is increased after cooling, which is conducive to improving the connection stability.

[0085] In the second stage welding operation, the contact surfaces of the first welding area 11 and the second welding area 21 are welded together, and the connection structure is stable.

[0086] Step 6: Cooling at rest to form a steel-aluminum welded structure. After cooling for a preset time, the flange structure 13 embedded in the second profile 2 is fixedly connected to the second profile 2, and the second profile protrusion 23 formed in the first profile through hole 12 is also fixedly connected to the first profile 1. Under the action of the flange structure 13, the tensile strength of the second profile 2 and the first profile 1 along the axial direction of the first profile through hole 12 can be improved. Under the action of the second profile protrusion 23, the tensile strength of the second profile 2 and the first profile 1 along the radial direction of the first profile through hole 12 can be improved.

[0087] To sum up, in the connection method between the first profile and the second profile provided by the present invention, the flange structure 13 embedded in the second profile 2 is used to improve the axial tensile strength of the second profile 2 and the first profile 1 along the first profile through hole 12, and the second profile protrusion 23 formed in the first profile through hole 12 is used to improve the radial tensile strength of the second profile 2 and the first profile 1 along the first profile through hole 12.

[0088] In the method for connecting the first profile and the second profile provided by the present invention, the flange structure 13 and the first profile 1 are an integral structure, and the second profile protrusion 23 and the second profile 2 are an integral structure, which further improves the stability of the connection between the first profile 1 and the second profile 2.

[0089] The method for connecting the first profile and the second profile provided by the present invention reduces the use of consumables and helps reduce costs.

[0090] In one embodiment, if Figure 5 As shown, the first profile through hole 12 is a circular hole, the first electrode 3 has a first spherical convex portion 31 , and the second electrode 4 has a second spherical convex portion 41 .

[0091] The first spherical protrusion 31 , the first profile through hole 12 and the second spherical protrusion 41 are coaxially arranged.

[0092] In this embodiment, the first spherical convex portion 31 , the first profile through hole 12 and the second spherical convex portion 41 are coaxially arranged, and the second spherical convex portion 41 is of course also coaxially arranged with the flange structure 13 .

[0093] Such arrangement has the following beneficial effects:

[0094] First, the distance between the first spherical convex portion 31 and the second spherical convex portion 41 is the smallest, which is conducive to rapid local heating of the current in this area and improves the heating effect.

[0095] Second: it is conducive to the linear transmission of the clamping force to clamp the first profile 1 and the second profile 2.

[0096] Third: it is beneficial to squeeze the softened second welding area 21 through the second spherical protrusion 41 , so that the area corresponding to the flange structure 13 or the first profile through hole 12 is deformed and protrudes into the first profile through hole 12 .

[0097] In one of the embodiments, 0.3KA≤I1<15KA, 0.5KN≤F1≤1.2KN; 15KA≤I2≤40KA, 4KN≤F1≤10KN.

[0098] That is, in the first stage of welding operation, the current size is selected between 0.3-15KA, and the pressure size is selected between 0.5-1.2KN. In the second stage of welding operation, the current size is selected between 15-40KA, and the pressure size is selected between 4-10KN.

[0099] The operation time of the first welding operation and the second welding operation is selected according to actual needs. For example, T1 can be selected between 5-10 cycles, and T2 can be selected between 5-15 cycles.

[0100] In one embodiment, the thickness of the second profile 2 is D.

[0101] When the through hole 12 of the first profile is punched, the extension amount of the flange structure 13 toward the second profile 2 is L.

[0102] If 1mm≤D<1.8mm, then 0.7mm≤L≤1.4mm.

[0103] If D≥1.8mm, then 1.5mm≤L≤2mm.

[0104] That is, when the flange structure 13 is in the initial state, the extension amount thereof protruding from the first profile 1 is L.

[0105] When the thickness of the second profile 2 is between 1-1.8 mm, L is selected between 0.7-1.4 mm.

[0106] When the thickness of the second profile 2 is greater than 1.8 mm, L is between 1.5 mm and 2 mm.

[0107] This ensures that the flange structure 13 does not pass through the second profile 2 and provides an effective connection between the second profile 2 and the first profile 1 .

[0108] In one embodiment, if Figure 3 As shown, when the flange structure 13 is punched, the flange structure 13 is punched into a trumpet shape with a large opening, which is convenient for being bent toward the first profile 1 to deform, and is also conducive to guiding the aluminum material or the second profile solution into the first profile through hole 12.

[0109] In one embodiment, if Figure 3 and Figure 9-10 As shown, the flange structure 13 is an outwardly expanding arc-shaped structure, which is more conducive to being bent and deformed toward the first profile 1 side.

[0110] In one embodiment, if Figure 9-10 As shown, after the flange structure 13 is punched out, a tip is formed at the end 131 of the flange structure 13 by grinding, so as to facilitate insertion into the second welding area 21 .

[0111] In one embodiment, if Figure 9-10 As shown, the thickness of the flange structure 13 gradually becomes thinner along the direction from the root to the end 131 of the flange structure 13 , which is convenient for forming a tip and can ensure the stability of the connection between the flange structure 13 and the first profile 1 .

[0112] In one embodiment, the first profile 1 has a plurality of first welding regions 11 arranged at intervals along the length direction, and correspondingly, the second profile 2 has a plurality of second welding regions 21 arranged at intervals along the length direction.

[0113] A first profile through-hole 12 and a flange structure 13 are punched out in each first welding region 11 .

[0114] During welding, each flange structure 13 is inserted into the welding region of the second profile 2, and each first profile through hole 12 is filled with the second profile solution.

[0115] After welding is completed, each flange structure 13 is embedded in the second profile 2 , and a second profile protrusion 23 is formed in each first profile through hole 12 .

[0116] In this embodiment, a plurality of flange structures 13 and second profile protrusions 23 are provided between the second profile 2 and the first profile 1 , which further improves the connection stability between the second profile 2 and the first profile 1 .

[0117] In one embodiment, the first welding area 11 and the second welding area 21 are welded in sequence along a preset order. Alternatively, a plurality of first welding areas 11 and a plurality of second welding areas 21 are welded synchronously.

[0118] In this embodiment, a first welding region 11 and a second welding region 21 may be welded in sequence according to a certain order, or a plurality of first welding regions 11 and a plurality of second welding regions 21 may be welded simultaneously at one time.

[0119] During synchronous welding, it is necessary to configure a first electrode 3 on each first welding area 11 and a second electrode 4 on each second welding area 21. A synchronous telescopic mechanism can be used to integrally drive all first electrodes 3 and second electrodes 4. The synchronous telescopic mechanism can be composed of a plurality of pistons or telescopic rods, each of which drives one electrode.

[0120] like Figure 1-8 As shown, an embodiment of the present invention provides a connection structure between a first profile and a second profile, wherein the melting point of the first profile 1 is higher than the melting point of the second profile 2 .

[0121] The first profile 1 has a first profile through hole 12 in the first welding region 11 , and a circle of flange structure 13 is formed on one side of the first welding region 11 , the flange structure 13 surrounds one end opening of the first profile through hole 12 .

[0122] The first profile 1 and the second profile 2 are connected by using the method for connecting the first profile and the second profile described in any of the aforementioned embodiments.

[0123] The flange structure 13 is embedded in the second welding area 21 of the second profile 2 and is fixedly connected to the second profile 2. A second profile protrusion 23 is embedded in the first profile through hole 12 and is fixedly connected to the first profile 1.

[0124] The connection structure between the first profile and the second profile provided by the present invention, the flange structure 13 embedded in the second profile 2 is used to improve the axial tensile strength of the second profile 2 and the first profile 1 along the first profile through hole 12, and the second profile protrusion 23 embedded in the first profile through hole 12 is used to improve the radial tensile strength of the second profile 2 and the first profile 1 along the first profile through hole 12.

[0125] The connection structure between the first profile and the second profile provided by the present invention, the flange structure 13 and the first profile 1 are an integrated structure, and the second profile protrusion 23 and the second profile 2 are an integrated structure, which further improves the stability of the connection between the first profile 1 and the second profile 2. As needed, the above technical solutions can be combined to achieve the best technical effect.

[0126] The above are only the principles and preferred embodiments of the present invention. It should be noted that, for those skilled in the art, several other modifications can be made based on the principles of the present invention, which should also be considered as the protection scope of the present invention.

Claims

1. A method for connecting a first profile and a second profile, wherein: The melting point of the first profile is higher than the melting point of the second profile; It is characterized by comprising the following steps: S01: pre-marking a first welding area on a first profile, punching a first profile through hole in the first welding area, and forming a circle of flange structure on one side of the first welding area, wherein the flange structure surrounds an end opening of the first profile through hole; S02: positioning the second profile and the first profile on a welding tool, and making the surface of the second welding area of ​​the second profile contact with the flanging structure; S03: disposing a first electrode on a side of the first welding region facing away from the flange structure, wherein the first electrode has a first cooling channel, and the first electrode covers the other end opening of the first profile through hole; A second electrode is arranged on a side of the second welding region facing away from the first profile, the second electrode has a second cooling channel, and the second electrode is in contact with the second profile; S04: applying a first current I1 and a first pressure F1 within a first time period T1, the second welding area gradually softens, the flange structure is inserted into the second welding area, and the second profile is fitted with the first profile; S05: applying a second current I2 and a second pressure F2 in a second time period T2, wherein the second pressure F2 is greater than the first pressure F1, and under the action of the second pressure F2, the flange structure is bent and deformed toward the first profile side, and the distance between the end of the flange structure and the through hole of the first profile increases; The second current I2 is greater than the first current I1, the second welding area continues to soften, and the second profile solution is formed by melting the side of the second welding area facing the first profile, at least part of the second profile solution is pressed into the through hole of the first profile, and the second welding area is welded to the first welding area; S06: After a preset cooling period, the flange structure is fixedly connected to the second profile, and the second profile protrusion formed in the through hole of the first profile is fixedly connected to the first profile.

2. The method for connecting the first profile and the second profile according to claim 1, characterized in that: The first profile through hole is a circular hole, the first electrode has a first spherical convex portion, and the second electrode has a second spherical convex portion; Wherein, the first spherical convex portion, the first profile through hole and the second spherical convex portion are coaxially arranged.

3. The method for connecting the first profile and the second profile according to claim 1, characterized in that: Among them, 0.3KA≤I1<15KA, 0.5KN≤F1≤1.2KN; 15KA≤I2≤40KA, 4KN≤F1≤10KN.

4. The method for connecting the first profile and the second profile according to claim 1, characterized in that: When the flange structure is punched, the flange structure is punched into a bell-mouth shape.

5. The method for connecting the first profile and the second profile according to claim 4, characterized in that: The flange structure is an outwardly expanding arc structure.

6. The method for connecting the first profile and the second profile according to claim 1, characterized in that: After the flange structure is formed by punching, a tip is formed at the end of the flange structure by grinding.

7. The method for connecting a first profile and a second profile according to claim 1, characterized in that: The thickness of the cuff structure gradually becomes thinner along the direction from the root to the tip of the cuff structure.

8. The method for connecting a first profile and a second profile according to any one of claims 1 to 7, characterized in that: The first profile has a plurality of first welding areas arranged at intervals along the length direction, and correspondingly, the second profile has a plurality of second welding areas arranged at intervals along the length direction; Punching out a first profile through hole and the flange structure in each of the first welding regions; During welding, each of the flange structures is inserted into the welding area of ​​the second profile, and each through hole of the first profile is filled with the second profile solution; After welding is completed, each of the flange structures is embedded in the second profile, and a second profile protrusion is formed in each through hole of the first profile.

9. The method for connecting the first profile and the second profile according to claim 8, characterized in that: Welding the first welding area and the second welding area in sequence along a preset order; or, The plurality of first welding regions and the plurality of second welding regions are welded synchronously.

10. A connection structure between a first profile and a second profile, wherein: The melting point of the first profile is higher than the melting point of the second profile; The first profile has a first profile through hole in the first welding area, and a flange structure is formed on one side of the first welding area, and the flange structure surrounds an end opening of the first profile through hole; The first profile and the second profile are connected by the method for connecting the first profile and the second profile according to any one of claims 1 to 9; The flange structure is embedded in the second welding area of ​​the second profile and is fixedly connected to the second profile; A second profile protrusion is embedded in the through hole of the first profile, and the second profile protrusion is fixedly connected to the first profile.

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