Composite hollow structure profile

Abstract

The invention provides a composite hollow structure profile, and relates to the technical field of composite hollow structure profiles, comprising: an outer structure profile provided with a first cavity; the at least one first inner structure profile is arranged in the first cavity; when the number of the first inner structure sectional material is one, the outer wall of the first inner structure sectional material abuts against the cavity wall of the first cavity and is fixed through laser penetration welding, and the number of the first welding seams is at least two; when the number of the first inner structure profiles is at least two, the outer walls of the first inner structure profiles abut against the cavity wall of the first cavity and are fixed through laser penetration welding, and the number of the first welding seams is at least two; the outer walls of every two adjacent first inner structure profiles abut against each other and are fixed through laser penetration welding, and the number of the second welding seams is at least one. According to the technical scheme, the section of the composite hollow structure profile can be smaller under the same strength, the strength is higher under the same section, and the application range is wider. The structural profiles are in linear contact and are connected through laser penetration welding, so that the connection strength and the bearing capacity are improved.

Description

Technical Field

[0001] The invention relates to the technical field of composite hollow structural profiles, and in particular to a composite hollow structural profile. Background Art

[0002] In the related art, the load-bearing capacity of a single profile is limited and cannot meet the requirements of some special working conditions. How to design a composite hollow structural profile with a smaller cross-section and higher strength is a problem that needs to be solved urgently. Summary of the invention

[0003] In order to solve or improve the technical problem that the bearing capacity of a single profile is limited and cannot meet the requirements of some special working conditions, an object of the present invention is to provide a composite hollow structural profile.

[0004] To achieve the above-mentioned object, the present invention provides a composite hollow structural profile, comprising an outer structural profile and at least one first inner structural profile. The outer structural profile is provided with a first cavity along a first direction, and the first direction is the length direction of the composite hollow structural profile. The first inner structural profile is arranged in the first cavity along the first direction. When the number of the first inner structural profile is one, the outer wall of the first inner structural profile abuts against the cavity wall of the first cavity, the first inner structural profile and the outer structural profile are relatively fixed by laser penetration welding, and there are at least two first welds between the first inner structural profile and the outer structural profile. When the number of first inner structural profiles is at least two, at least two first inner structural profiles are arranged side by side in the first cavity, the outer wall of each first inner structural profile is abutted against the cavity wall of the first cavity, the first inner structural profile and the outer structural profile are relatively fixed by laser penetration welding, and there are at least two first welds between the first inner structural profile and the outer structural profile; the outer walls of two adjacent first inner structural profiles are abutted against each other, the two adjacent first inner structural profiles are relatively fixed by laser penetration welding, and there is at least one second weld between the two adjacent first inner structural profiles.

[0005] The present invention aims to provide a composite hollow structural profile, in which at least one first inner structural profile is arranged in a first cavity of an outer structural profile. This design method can achieve a smaller cross-section under the same strength, and a higher strength under the same cross-section, and a wider range of applications, and can meet the requirements of some special working conditions. In addition, the contact mode between adjacent structural profiles (between the first inner structural profile and the outer structural profile, and between two adjacent first inner structural profiles) is line contact, and they are connected by laser penetration welding. This design method can ensure the connection strength between adjacent structural profiles, improve the bearing capacity of the composite hollow structural profile, and the structural stability of the composite hollow structural profile is higher.

[0006] In addition, the above technical solution provided by the present invention may also have the following additional technical features: In some technical solutions, optionally, the first inner structural profile is provided with a second cavity along the first direction. The composite hollow structural profile further includes at least one second inner structural profile. The second inner structural profile is provided in the second cavity along the first direction, the outer wall of the second inner structural profile abuts against the cavity wall of the second cavity, the second inner structural profile is relatively fixed to the first inner structural profile by laser penetration welding, and there are at least two third welds between the second inner structural profile and the first inner structural profile.

[0007] In this technical solution, there is at least one second internal structural profile, that is, the number of the second internal structural profiles can be one, two or more. Considering factors such as spatial layout, structural strength and bearing capacity of the composite hollow structural profile, material cost, etc., the second internal structural profile is flexibly arranged.

[0008] The second inner structural profile is arranged in the second cavity along the first direction. In other words, the second inner structural profile is arranged in the second cavity, and the second inner structural profile is arranged along the first direction (the length direction of the composite hollow structural profile). Optionally, the length direction of the second inner structural profile is consistent with the first direction.

[0009] It should be noted that before laser penetration welding is performed on the second inner structural profile and the first inner structural profile, the outer wall of the second inner structural profile abuts against the cavity wall of the second cavity, and the contact mode is line contact (abutting against each other in a line-to-line contact mode).

[0010] Laser penetration welding is performed on the line where the outer wall of the second inner structural profile abuts against the cavity wall of the second cavity, and the contact position between the outer wall of the second inner structural profile and the cavity wall of the second cavity is fused together to form a third weld.

[0011] It should be emphasized that the number of the third welds is at least two, so as to ensure that after laser penetration welding, the second inner structure profile is relatively fixed to the first inner structure profile.

[0012] By arranging the second inner structural profile in the second cavity of the first inner structural profile, the composite hollow structural profile can have a smaller cross-section at the same strength, a higher strength at the same cross-section, a wider range of applications, and can meet the requirements of some special working conditions.

[0013] In some technical solutions, optionally, the number of second inner structural profiles is less than the number of first inner structural profiles, and the first inner structural profile with the second inner structural profile inside is spaced apart from the first inner structural profile without the second inner structural profile inside.

[0014] In this technical solution, the first inner structure profile having the second inner structure profile disposed therein (the second inner structure profile disposed therein) is spaced from the first inner structure profile not having the second inner structure profile disposed therein (the second inner structure profile not being disposed therein). In other words, the first inner structure profile having the second inner structure profile disposed therein in the second cavity is not adjacent to each other.

[0015] This design approach can improve the structural strength and load-bearing capacity of composite hollow structural profiles while optimizing spatial layout and controlling material costs.

[0016] In some technical solutions, optionally, the number of the second inner structural profiles is consistent with the number of the first inner structural profiles, and each second inner structural profile is arranged in a corresponding second cavity.

[0017] In this technical solution, a second inner structural profile is provided inside each first inner structural profile. This design method is conducive to improving the structural strength and bearing capacity of the composite hollow structural profile.

[0018] In some technical solutions, optionally, the number of second inner structural profiles is greater than the number of first inner structural profiles, at least two second inner structural profiles are provided in at least one second cavity, and / or at least one second inner structural profile is provided in at least one second cavity.

[0019] In this technical solution, since the number of second internal structural profiles is greater than the number of first internal structural profiles, at least one second internal structural profile is provided inside each first internal structural profile (in the second cavity), and some second cavities (at least one second cavity) are provided with two or more second internal structural profiles. This design method is conducive to optimizing the spatial layout and further improving the structural strength and bearing capacity of the composite hollow structural profile.

[0020] In some technical solutions, optionally, the outer wall of the second inner structural profile and the cavity wall of the second cavity are fused together at the abutting position by laser penetration welding to form at least two third welds.

[0021] In this technical solution, the second inner structural profile is an important component of the composite hollow structural profile, and its outer wall has a close connection with the cavity wall of the second cavity. At the position where the two are against each other, advanced laser penetration welding technology is used to achieve the fusion of the two. Laser penetration welding is a welding method with the characteristics of high precision and energy concentration. It can accurately act on the tiny contact area where the two are against each other. During the welding process, the laser beam penetrates the surface of the material with extremely high energy density, so that the outer wall of the second inner structural profile and the cavity wall of the second cavity at the contact point quickly melt and fuse together. Moreover, this fusion is not a simple single-point connection, but at least two third welds are formed along the position where the two are against each other. These welds are evenly distributed at the position where they are against each other, like a tough bond, tightly connecting the second inner structural profile and the second cavity as a whole, providing a reliable guarantee for the overall structural stability of the composite hollow structural profile, effectively preventing the relative displacement or loosening between the two when subjected to external forces, and ensuring that the composite hollow structural profile can still maintain good performance in a complex use environment.

[0022] In some technical solutions, optionally, the outer wall of the first inner structural profile and the cavity wall of the first cavity are fused together at the abutting position by laser penetration welding to form at least two first welds.

[0023] In this technical solution, this design method can tightly connect the first internal structural profile and the first cavity into a whole, providing a reliable guarantee for the overall structural stability of the composite hollow structural profile, effectively preventing relative displacement or loosening between the two when subjected to external force, and ensuring that the composite hollow structural profile can still maintain good performance in complex use environments.

[0024] In some technical solutions, optionally, the cross-sectional shape of the outer wall of the first inner structural profile is circular or quadrilateral. When the cross-sectional shape of the outer wall of the first inner structural profile is quadrilateral, the outer wall of the first inner structural profile has four first corner structures, the first corner structures are chamfered, and at least two of the first corner structures after the chamfering are abutted against the cavity wall of the first cavity and fused together by laser penetration welding.

[0025] In this technical solution, before the laser penetration welding operation is performed on the outer structural profile and the first inner structural profile, at least two first corner structures after chamfering have formed a state of abutment with the cavity wall of the first cavity. Moreover, their contact mode is line contact, that is, they are closely connected in a line-to-line contact mode. This line contact mode not only ensures the connection stability, but also provides good conditions for subsequent welding operations.

[0026] The key step is to perform laser penetration welding on the lines where the outer wall of the first inner structural profile and the wall of the first cavity abut each other. During the laser penetration welding process, a high-energy-density laser beam acts precisely on these abutting lines. The energy carried by the laser causes the outer wall of the first inner structural profile and the wall of the first cavity to melt rapidly at the contact point, and then fuse together to eventually form a first weld. These first welds play a vital role in the entire composite hollow structural profile structure. They are like tough bonds that ensure a stable connection between the first inner structural profile and the outer structural profile, providing a reliable structural guarantee for the composite hollow structural profile when subjected to various external forces, enabling it to maintain good performance in complex use environments.

[0027] In some technical solutions, optionally, the cross-sectional shape of the outer wall of the second inner structural profile is circular or quadrilateral. When the cross-sectional shape of the outer wall of the second inner structural profile is quadrilateral, the outer wall of the second inner structural profile has four second corner structures, and the second corner structures are chamfered. At least two of the second corner structures after the chamfering are abutted against the cavity wall of the second cavity and are fused together by laser penetration welding.

[0028] In this technical solution, during the laser penetration welding process, a high-energy-density laser beam acts precisely on these opposing lines. The energy carried by the laser causes the outer wall of the first inner structural profile and the cavity wall of the first cavity to melt rapidly at the contact position, and then fuse together to eventually form a first weld. These first welds play a vital role in the entire composite hollow structural profile structure. They are like tough bonds that ensure a stable connection between the first inner structural profile and the outer structural profile, providing a reliable structural guarantee for the composite hollow structural profile when subjected to various external forces, enabling it to maintain good performance in complex use environments.

[0029] In some technical solutions, optionally, the second inner structural profile is an H-shaped steel.

[0030] In this technical solution, this design method can reduce the processing difficulty of the second inner structural profile while ensuring that the structural strength and bearing capacity of the composite hollow structural profile are improved.

[0031] Additional aspects and advantages of the technical solutions of the present invention will become apparent in the following description or will be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 shows a side view of a composite hollow structural profile according to one embodiment of the present invention; Figure 2 A cross-sectional view of a composite hollow structural profile according to an embodiment of the present invention is shown; Figure 3 shows a cross-sectional view of a composite hollow structural profile according to another embodiment of the present invention; Figure 4 shows a cross-sectional view of a composite hollow structural profile according to another embodiment of the present invention; Figure 5 shows a cross-sectional view of a composite hollow structural profile according to another embodiment of the present invention; Figure 6 shows a cross-sectional view of a composite hollow structural profile according to another embodiment of the present invention; Figure 7 shows a cross-sectional view of a composite hollow structural profile according to another embodiment of the present invention; Figure 8 shows a cross-sectional view of a composite hollow structural profile according to another embodiment of the present invention; Fig. 9 shows a cross-sectional view of a composite hollow structural profile according to another embodiment of the present invention; Fig.10 shows a cross-sectional view of a composite hollow structural profile according to another embodiment of the present invention; Fig.11 shows a cross-sectional view of a composite hollow structural profile according to another embodiment of the present invention; Fig.12 shows a cross-sectional view of a composite hollow structural profile according to another embodiment of the present invention; Fig.13 A cross-sectional view of a composite hollow structural profile according to another embodiment of the present invention is shown.

[0033] in, Figures 1 to 13 The corresponding relationship between the reference numerals and the component names is as follows: 100: composite hollow structural profile; 110: outer structural profile; 111: first cavity; 120: first inner structural profile; 121: second cavity; 122: first corner structure; 130: second inner structural profile; 131: third cavity; 132: second corner structure; 141: first weld; 142: second weld; 143: third weld; a: first direction. DETAILED DESCRIPTION

[0034] In order to more clearly understand the above-mentioned purposes, features and advantages of the embodiments of the present invention, the embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0035] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the embodiments of the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0036] Refer to the following Figures 1 to 13 A composite hollow structural shape 100 is described according to some embodiments of the present invention.

[0037] In one embodiment according to the present invention, Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, the composite hollow structure profile 100 (Composite Hollow Structure Sections) includes an outer structure profile 110 and at least one first inner structure profile 120. The outer structure profile 110 is provided with a first cavity 111 along a first direction a, and the first direction a is the length direction of the composite hollow structure profile 100 (such as Figure 1 In other words, the outer structural profile 110 is a hollow structure, and a first cavity 111 is provided inside the outer structural profile 110, and the first cavity 111 is arranged along the first direction a (the length direction of the composite hollow structural profile 100). Optionally, the length direction of the outer structural profile 110 is consistent with the first direction a, and the length direction of the first cavity 111 is consistent with the first direction a.

[0038] Optionally, the cross-sectional shape of the outer wall of the outer structural profile 110 is circular or quadrilateral. When the cross-sectional shape of the outer wall of the outer structural profile 110 is circular, the outer structural profile 110 can be understood as a circular tube structure; when the cross-sectional shape of the outer wall of the outer structural profile 110 is square, the outer structural profile 110 can be understood as a square tube structure.

[0039] Optionally, the cross-sectional shape of the inner wall of the outer structural profile 110 (the cavity wall of the first cavity 111) is circular or quadrilateral. The cross-sectional shape of the inner wall of the outer structural profile 110 is consistent with the cross-sectional shape of the outer wall, which facilitates the processing of the outer structural profile 110. Specifically, Figure 8 , Fig. 9 and Fig.10 As shown, when the cross-sectional shape of the outer wall of the outer structural profile 110 is circular, the cross-sectional shape of the inner wall thereof is also circular; Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7As shown, when the cross-sectional shape of the outer wall of the outer structural profile 110 is square, the cross-sectional shape of the inner wall thereof is also square.

[0040] It should be noted that the quadrilateral includes a square, a rectangle and a rhombus. The cross-sectional shape of the outer wall of the outer structural profile 110 is any one of a circle, a square, a rectangle and a rhombus. The cross-sectional shape of the inner wall of the outer structural profile 110 is any one of a circle, a square, a rectangle and a rhombus.

[0041] Optionally, the material of the outer structural profile 110 is ordinary steel, stainless steel or nickel-based alloy.

[0042] There is at least one first internal structural profile 120, that is, the number of the first internal structural profiles 120 can be one, two or more. Considering factors such as spatial layout, structural strength and bearing capacity of the composite hollow structural profile 100, and material cost, the first internal structural profile 120 is flexibly arranged.

[0043] The first inner structural profile 120 is disposed in the first cavity 111 along the first direction a. In other words, the first inner structural profile 120 is disposed in the first cavity 111, and the first inner structural profile 120 is disposed along the first direction a (the length direction of the composite hollow structural profile 100). Optionally, the length direction of the first inner structural profile 120 is consistent with the first direction a.

[0044] like Figure 2 , Figure 5 and Figure 8 As shown, when the number of the first inner structural profile 120 is one, the outer wall of the first inner structural profile 120 abuts against the cavity wall of the first cavity 111, the first inner structural profile 120 and the outer structural profile 110 are relatively fixed by laser penetration welding, and there are at least two first welds 141 between the first inner structural profile 120 and the outer structural profile 110.

[0045] Laser penetration welding is a melting welding technology that uses laser beam as energy. When the laser energy is strong enough, it can penetrate the outer layer material (outer structural profile 110), melt the inner layer material (first inner structural profile 120), and form a molten pool between the two layers of material. As the laser beam moves, the molten pool also moves, and after cooling and solidification, a strong weld joint (i.e., the first weld 141) is formed.

[0046] The advantages of using laser penetration welding are: first, laser penetration welding can accurately control the welding position and penetration depth. Because the laser beam can be focused to a very small light plate size, its energy is highly concentrated, so that micron-level welding accuracy can be achieved; second, laser penetration welding has good deep melting ability. Compared with traditional welding methods, it can obtain a larger penetration depth with a smaller heat input. This is very beneficial for welding thick plates or multi-layer materials; third, the welding speed is fast. Since the laser energy is highly concentrated, the heating and cooling speeds are extremely fast, and high-speed welding can be achieved; fourth, since the laser energy is concentrated during the welding process, the heat-affected zone is very small. When welding some heat-sensitive materials, such as some high-strength alloy steels or non-ferrous metals, the problem of material performance degradation caused by the heat-affected zone can be reduced.

[0047] It should be noted that before laser penetration welding is performed on the outer structural profile 110 and the first inner structural profile 120 , the outer wall of the first inner structural profile 120 abuts against the cavity wall of the first cavity 111 , and the contact mode is line contact (abutting against each other in a line-to-line contact mode).

[0048] Line contact usually refers to the situation where when two objects are in contact, the contact area is very small and mainly concentrated on a line, rather than surface contact.

[0049] Laser penetration welding is performed on the line where the outer wall of the first inner structure profile 120 and the cavity wall of the first cavity 111 abut against each other, and the contact position between the outer wall of the first inner structure profile 120 and the cavity wall of the first cavity 111 is fused together to form a first weld 141 .

[0050] It should be emphasized that the number of the first welds 141 is at least two, so as to ensure that the first inner structural profile 120 and the outer structural profile 110 are relatively fixed after laser penetration welding.

[0051] In a specific embodiment, before laser penetration welding is performed on the outer structural profile 110 and the first inner structural profile 120, there are only two contact positions (specifically two contact lines) between the outer wall of the first inner structural profile 120 and the cavity wall of the first cavity 111. After laser penetration welding, there are two first welds 141 between the first inner structural profile 120 and the outer structural profile 110.

[0052] In a specific embodiment, before laser penetration welding is performed on the outer structural profile 110 and the first inner structural profile 120, there are four contact positions (specifically four contact lines) between the outer wall of the first inner structural profile 120 and the cavity wall of the first cavity 111. After laser penetration welding, there are four first welds 141 between the first inner structural profile 120 and the outer structural profile 110.

[0053] like Figure 3 , Figure 4 , Figure 6 and Figure 7 As shown, when the number of the first inner structural profiles 120 is at least two, at least two first inner structural profiles 120 are arranged side by side in the first cavity 111, the outer wall of each first inner structural profile 120 is against the cavity wall of the first cavity 111, the first inner structural profile 120 and the outer structural profile 110 are relatively fixed by laser penetration welding, and there are at least two first welds 141 between the first inner structural profile 120 and the outer structural profile 110; the outer walls of two adjacent first inner structural profiles 120 are against each other, the two adjacent first inner structural profiles 120 are relatively fixed by laser penetration welding, and there is at least one second weld 142 between the two adjacent first inner structural profiles 120.

[0054] Optionally, when the number of the first inner structural profiles 120 is at least two, at least two first inner structural profiles 120 are arranged side by side in the first cavity 111 along the second direction, and the second direction is perpendicular to the first direction a. It can be understood that the second direction is the width direction or the height direction of the composite hollow structural profile 100.

[0055] It should be noted that before laser penetration welding is performed on the outer structural profile 110 and the first inner structural profile 120, the outer wall of the first inner structural profile 120 abuts against the cavity wall of the first cavity 111, and the contact mode is line contact (abutting against each other in a line-to-line contact mode). Before laser penetration welding is performed on two adjacent first inner structural profiles 120, the outer walls of the two adjacent first inner structural profiles 120 abut against each other, and the contact mode is line contact (abutting against each other in a line-to-line contact mode).

[0056] Laser penetration welding is performed on the line where the outer wall of the first inner structure profile 120 and the cavity wall of the first cavity 111 abut against each other, and the contact position between the outer wall of the first inner structure profile 120 and the cavity wall of the first cavity 111 is fused together to form a first weld 141 .

[0057] Laser penetration welding is performed on the line where the outer walls of two adjacent first inner structural profiles 120 abut against each other, and the contact positions between the outer walls of the two adjacent first inner structural profiles 120 are fused together to form a second weld 142 .

[0058] In a specific embodiment, before laser penetration welding is performed on the outer structural profile 110 and the first inner structural profile 120, there are only two contact positions (specifically two contact lines) between the outer wall of the first inner structural profile 120 and the cavity wall of the first cavity 111. After laser penetration welding, there are two first welds 141 between the first inner structural profile 120 and the outer structural profile 110.

[0059] In a specific embodiment, before laser penetration welding is performed on two adjacent first inner structural profiles 120, the outer walls of the two adjacent first inner structural profiles 120 have only one contact position (specifically, a contact line). After laser penetration welding, the second weld 142 between the two adjacent first inner structural profiles 120 is one.

[0060] Optionally, the cross-sectional shape of the outer wall of the first inner structural profile 120 is circular or quadrilateral. When the cross-sectional shape of the outer wall of the first inner structural profile 120 is circular, the first inner structural profile 120 can be understood as a circular tube structure; when the cross-sectional shape of the outer wall of the first inner structural profile 120 is square, the first inner structural profile 120 can be understood as a square tube structure.

[0061] Optionally, the cross-sectional shape of the inner wall of the first inner structural profile 120 (the cavity wall of the second cavity 121) is circular or quadrilateral. The cross-sectional shape of the inner wall of the first inner structural profile 120 is consistent with the cross-sectional shape of the outer wall, which facilitates the processing of the first inner structural profile 120. Specifically, Figure 2 and Fig.10 As shown, when the cross-sectional shape of the outer wall of the first inner structural profile 120 is circular, the cross-sectional shape of the inner wall thereof is also circular; Figure 5 , Figure 8 and Fig. 9 As shown, when the cross-sectional shape of the outer wall of the first inner structural profile 120 is a square, the cross-sectional shape of the inner wall thereof is also a square.

[0062] It should be noted that the quadrilateral includes a square, a rectangle and a rhombus. The cross-sectional shape of the outer wall of the first inner structural profile 120 is any one of a circle, a square, a rectangle and a rhombus. The cross-sectional shape of the inner wall of the first inner structural profile 120 is any one of a circle, a square, a rectangle and a rhombus.

[0063] Optionally, the first inner structural profile 120 is made of ordinary steel, stainless steel or nickel-based alloy.

[0064] The present invention aims to provide a composite hollow structural profile 100, in which at least one first inner structural profile 120 is arranged in a first cavity 111 of an outer structural profile 110. This design method can achieve a smaller cross-section under the same strength, and a higher strength under the same cross-section, and a wider range of applications, and can meet the requirements of some special working conditions. In addition, the contact method between adjacent structural profiles (between the first inner structural profile 120 and the outer structural profile 110, and between two adjacent first inner structural profiles 120) is line contact, and they are connected by laser penetration welding. This design method can ensure the connection strength between adjacent structural profiles, improve the bearing capacity of the composite hollow structural profile 100, and the structural stability of the composite hollow structural profile 100 is higher.

[0065] It should be emphasized that the composite hollow structural profile 100 of the present invention has a wide range of applications, and is particularly suitable for the construction field and the mechanical field.

[0066] In the field of construction, the composite hollow structural profile 100 of the present invention can be used as a supporting structure. Its highly stable structure can withstand the weight of the curtain wall itself and external forces such as wind loads, and the reasonable space utilization design ensures that the curtain wall will not affect the appearance or occupy too much space due to the excessive size of the profile during installation. At the same time, the high-quality welds of laser penetration welding ensure that the composite hollow structural profile 100 can still maintain good performance during long-term use even in the face of harsh environmental conditions (such as temperature changes, humidity changes, etc.).

[0067] In the mechanical field, the composite hollow structural profile 100 of the present invention can be used as the frame structure of some mechanical equipment, such as a mechanical arm, etc. The multi-weld design and reasonable internal and external structure design of the composite hollow structural profile 100 of the present invention can reduce the possibility of structural deformation, thereby ensuring the normal operation and accuracy of the equipment. Moreover, laser penetration welding has little effect on material properties, making it easier to perform subsequent processing operations, such as drilling and cutting, on the composite hollow structural profile 100 during mechanical processing.

[0068] In some embodiments, optionally, the first inner structural profile 120 is provided with a second cavity 121 along the first direction a. In other words, the first inner structural profile 120 is a hollow structure, and a second cavity 121 is provided inside the first inner structural profile 120, and the second cavity 121 is provided along the first direction a (the length direction of the composite hollow structural profile 100). The length direction of the second cavity 121 is consistent with the first direction a.

[0069] like Fig. 9 , Fig.10 , Fig.11 , Fig.12 and Fig.13As shown, the composite hollow structural profile 100 further includes at least one second inner structural profile 130. The second inner structural profile 130 is disposed in the second cavity 121 along the first direction a.

[0070] There is at least one second inner structural profile 130, that is, the number of the second inner structural profiles 130 can be one, two or more. Considering factors such as spatial layout, structural strength and bearing capacity of the composite hollow structural profile 100, and material cost, the second inner structural profile 130 is flexibly arranged.

[0071] The second inner structural profile 130 is disposed in the second cavity 121 along the first direction a. In other words, the second inner structural profile 130 is disposed in the second cavity 121, and the second inner structural profile 130 is disposed along the first direction a (the length direction of the composite hollow structural profile 100). Optionally, the length direction of the second inner structural profile 130 is consistent with the first direction a.

[0072] The outer wall of the second inner structure profile 130 abuts against the cavity wall of the second cavity 121, and the second inner structure profile 130 and the first inner structure profile 120 are relatively fixed by laser penetration welding. There are at least two third welds 143 between the second inner structure profile 130 and the first inner structure profile 120.

[0073] It should be noted that before laser penetration welding is performed on the second inner structural profile 130 and the first inner structural profile 120, the outer wall of the second inner structural profile 130 abuts against the cavity wall of the second cavity 121, and the contact mode is line contact (abutting against each other in a line-to-line contact mode).

[0074] Laser penetration welding is performed on the line where the outer wall of the second inner structural profile 130 and the cavity wall of the second cavity 121 abut against each other, and the contact position between the outer wall of the second inner structural profile 130 and the cavity wall of the second cavity 121 is fused together to form a third weld 143 .

[0075] It should be emphasized that the number of the third welds 143 is at least two, so as to ensure that the second inner structure profile 130 and the first inner structure profile 120 are relatively fixed after laser penetration welding.

[0076] In a specific embodiment, before laser penetration welding is performed on the second inner structural profile 130 and the first inner structural profile 120, there are only two contact positions (specifically two contact lines) between the outer wall of the second inner structural profile 130 and the cavity wall of the second cavity 121. After laser penetration welding, there are two third welds 143 between the second inner structural profile 130 and the first inner structural profile 120.

[0077] In a specific embodiment, before laser penetration welding is performed on the second inner structural profile 130 and the first inner structural profile 120, there are four contact positions (specifically four contact lines) between the outer wall of the second inner structural profile 130 and the cavity wall of the second cavity 121. After laser penetration welding, there are four third welds 143 between the second inner structural profile 130 and the first inner structural profile 120.

[0078] Optionally, the cross-sectional shape of the outer wall of the second inner structural profile 130 is circular or quadrilateral. When the cross-sectional shape of the outer wall of the second inner structural profile 130 is circular, the second inner structural profile 130 can be understood as a circular tube structure; when the cross-sectional shape of the outer wall of the second inner structural profile 130 is square, the second inner structural profile 130 can be understood as a square tube structure.

[0079] Optionally, the cross-sectional shape of the inner wall of the second inner structural profile 130 is circular or quadrilateral. The cross-sectional shape of the inner wall of the second inner structural profile 130 is consistent with the cross-sectional shape of the outer wall, which facilitates the processing of the second inner structural profile 130. Specifically, when the cross-sectional shape of the outer wall of the second inner structural profile 130 is circular, the cross-sectional shape of its inner wall is also circular; when the cross-sectional shape of the outer wall of the second inner structural profile 130 is square, the cross-sectional shape of its inner wall is also square.

[0080] It should be noted that the quadrilateral includes a square, a rectangle and a rhombus. The cross-sectional shape of the outer wall of the second inner structural profile 130 is any one of a circle, a square, a rectangle and a rhombus. The cross-sectional shape of the inner wall of the second inner structural profile 130 is any one of a circle, a square, a rectangle and a rhombus.

[0081] Optionally, the second inner structural profile 130 is made of common steel, stainless steel or nickel-based alloy.

[0082] By arranging the second inner structural profile 130 in the second cavity 121 of the first inner structural profile 120, the composite hollow structural profile 100 can have a smaller cross-section at the same strength, a higher strength at the same cross-section, a wider range of applications, and can meet the requirements of some special working conditions.

[0083] In some embodiments, optionally, the number of the second inner structural profiles 130 is less than the number of the first inner structural profiles 120 .

[0084] The first inner structure profile 120 with the second inner structure profile 130 disposed therein (the second inner structure profile 130 disposed therein in the second cavity 121) is spaced from the first inner structure profile 120 without the second inner structure profile 130 disposed therein (the second inner structure profile 130 is not disposed therein in the second cavity 121). In other words, the first inner structure profile 120 with the second inner structure profile 130 disposed therein in the second cavity 121 is not adjacent to each other.

[0085] This design approach can improve the structural strength and load-bearing capacity of the composite hollow structural profile 100 while optimizing the spatial layout and controlling the material cost.

[0086] Specifically, from the perspective of structural strength, this design of spacing and quantity relationship enables the composite hollow structural profile 100 to distribute stress more evenly when subjected to external force. The first inner structural profile 120 and the second inner structural profile 130 at different positions cooperate with each other, like a closely coordinated mechanical network, and can more effectively resist various forms of external forces such as stretching, compression, and bending, thereby significantly improving the overall structural strength of the composite hollow structural profile 100; from the perspective of bearing capacity, this design also exhibits excellent performance. Whether it is subjected to static heavy pressure or dynamic impact load, the composite hollow structural profile 100 can rely on this special structural layout to better transfer and disperse the load to each component, avoid local excessive stress, and thus greatly improve its bearing capacity; from the perspective of spatial layout, this design plays an important role. By reasonably arranging the position and quantity of the second inner structural profile 130 and the first inner structural profile 120, the composite hollow structural profile 100 achieves more efficient space utilization in a limited space. There is no waste of space due to excessive structural filling, which ensures that the composite hollow structural profile 100 can better adapt to various space restrictions during installation and use. From the perspective of material cost, this design method also has obvious advantages. Since the number of the second internal structural profiles 130 is less than the first internal structural profiles 120, the amount of material used is reduced while ensuring the performance of the composite hollow structural profile 100, thereby effectively controlling the material cost and improving the cost performance of the product, making the composite hollow structural profile 100 more advantageous in market competition.

[0087] In some embodiments, optionally, the number of the second inner structural profiles 130 is consistent with the number of the first inner structural profiles 120 , and each second inner structural profile 130 is disposed in a corresponding second cavity 121 .

[0088] A second inner structural profile 130 is disposed inside each first inner structural profile 120 . This design is beneficial to improving the structural strength and bearing capacity of the composite hollow structural profile 100 .

[0089] In some embodiments, optionally, the number of second inner structural profiles 130 is greater than the number of first inner structural profiles 120 , at least two second inner structural profiles 130 are provided in at least one second cavity 121 , and / or at least one second inner structural profile 130 is provided in at least one second cavity 121 .

[0090] Since the number of the second inner structural profiles 130 is greater than the number of the first inner structural profiles 120, at least one second inner structural profile 130 is provided inside each first inner structural profile 120 (inside the second cavity 121), and two or more second inner structural profiles 130 are provided in some second cavities 121 (inside at least one second cavity 121). This design method is conducive to optimizing the spatial layout and further improving the structural strength and bearing capacity of the composite hollow structural profile 100.

[0091] Specifically, from the perspective of spatial layout, this design makes full use of the space inside the composite hollow structural profile 100. By rationally arranging different numbers of second internal structural profiles 130 in different second cavities 121, the use of space is more efficient. There is no idle or wasted space, and this layout method can better adapt to the restrictions on the external dimensions of the composite hollow structural profile 100 in different usage scenarios, so that the composite hollow structural profile 100 can play a more powerful role in a limited space; from the perspective of structural strength, the distribution of multiple second internal structural profiles 130 at different positions forms a more complex and stable internal support network. When the composite hollow structural profile 100 is subjected to external force, these second internal structural profiles 130 can share stress from multiple angles and positions, cooperate with the first internal structural profile 120, and jointly resist external force. Whether it is subjected to different types of forces such as tension, compression, bending or torsion, this interwoven support structure can effectively prevent structural deformation, greatly improving the overall structural strength of the composite hollow structural profile 100, so that it can maintain good structural integrity under harsh stress environments; from the perspective of load-bearing capacity, the advantages of this design are also very significant. Due to the strengthened internal structure, the composite hollow structural profile 100 performs better when carrying heavy objects or dynamic loads. Whether it is bearing huge weights and complex external forces in large buildings, or coping with high-intensity workloads and frequent vibration shocks in industrial machinery, this composite hollow structural profile 100 with more second internal structural profiles 130 can rely on its excellent structural design to reliably bear the corresponding loads, provide solid guarantees for the stable operation of the entire system, and further improve the applicability of the composite hollow structural profile 100 in various high-demand application scenarios.

[0092] In some embodiments, optionally, the outer wall of the second inner structural profile 130 and the cavity wall of the second cavity 121 are fused together at the abutting position by laser penetration welding to form at least two third welds 143 .

[0093] The second inner structural profile 130 is an important component of the composite hollow structural profile 100, and its outer wall is closely connected to the wall of the second cavity 121. At the position where the two are against each other, advanced laser penetration welding technology is used to achieve the fusion of the two. Laser penetration welding is a welding method with the characteristics of high precision and concentrated energy. It can accurately act on the tiny contact area where the two are against each other. During the welding process, the laser beam penetrates the surface of the material with extremely high energy density, so that the outer wall of the second inner structural profile 130 and the wall of the second cavity 121 at the contact point quickly melt and fuse together. Moreover, this fusion is not a simple single-point connection, but at least two third welds 143 are formed along the position where the two are against each other. These welds are evenly distributed at the abutting positions, like tough bonds, tightly connecting the second inner structural profile 130 and the second cavity 121 into a whole, providing reliable protection for the overall structural stability of the composite hollow structural profile 100, and effectively preventing relative displacement or loosening between the two when subjected to external forces, thereby ensuring that the composite hollow structural profile 100 can still maintain good performance in complex usage environments.

[0094] In some embodiments, optionally, the outer wall of the first inner structural profile 120 and the cavity wall of the first cavity 111 are fused together at the abutting position by laser penetration welding to form at least two first welds 141 .

[0095] This design method can tightly connect the first inner structural profile 120 and the first cavity 111 into a whole, providing a reliable guarantee for the overall structural stability of the composite hollow structural profile 100, and effectively preventing relative displacement or loosening between the two when subjected to external force, thereby ensuring that the composite hollow structural profile 100 can still maintain good performance in complex usage environments.

[0096] In some embodiments, optionally, the cross-sectional shape of the outer wall of the first inner structural profile 120 is circular or quadrilateral. When the cross-sectional shape of the outer wall of the first inner structural profile 120 is quadrilateral, the outer wall of the first inner structural profile 120 has four first corner structures 122, and the first corner structures 122 are chamfered. At least two of the first corner structures 122 after the chamfering process abut against the cavity wall of the first cavity 111, and are fused together by laser penetration welding.

[0097] Before laser penetration welding is performed on the outer structural profile 110 and the first inner structural profile 120, at least two first corner structures 122 after chamfering are abutted against the cavity wall of the first cavity 111, and the contact mode is line contact (abutting against each other in a line-to-line contact mode).

[0098] Laser penetration welding is performed on the line where the outer wall of the first inner structure profile 120 and the cavity wall of the first cavity 111 abut against each other, and the contact position between the outer wall of the first inner structure profile 120 and the cavity wall of the first cavity 111 is fused together to form a first weld 141 .

[0099] It should be noted that before the laser penetration welding operation is performed on the outer structural profile 110 and the first inner structural profile 120, the at least two first corner structures 122 after the chamfering process have formed a state of abutment with the cavity wall of the first cavity 111. Moreover, their contact mode is line contact, that is, they are closely connected in a line-to-line contact mode. This line contact mode not only ensures the connection stability, but also provides good conditions for subsequent welding operations.

[0100] The key step is to perform laser penetration welding on the lines where the outer wall of the first inner structural profile 120 and the wall of the first cavity 111 abut against each other. During the laser penetration welding process, a high-energy-density laser beam acts precisely on these abutting lines. The energy carried by the laser causes the outer wall of the first inner structural profile 120 and the wall of the first cavity 111 to melt rapidly at the contact position, and then fuse together, eventually forming a first weld 141. These first welds 141 play a vital role in the structure of the entire composite hollow structural profile 100. They are like tough bonds that ensure a stable connection between the first inner structural profile 120 and the outer structural profile 110, and provide a reliable structural guarantee for the composite hollow structural profile 100 when subjected to various external forces, so that it can maintain good performance in a complex use environment.

[0101] In some embodiments, optionally, the cross-sectional shape of the outer wall of the second inner structural profile 130 is circular or quadrilateral. When the cross-sectional shape of the outer wall of the second inner structural profile 130 is quadrilateral, the outer wall of the second inner structural profile 130 has four second corner structures 132, and the second corner structures 132 are chamfered. At least two of the second corner structures 132 after the chamfering are abutted against the cavity wall of the second cavity 121 and are fused together by laser penetration welding.

[0102] Before laser penetration welding is performed on the second inner structure profile 130 and the first inner structure profile 120, at least two second corner structures 132 after chamfering are abutted against the cavity wall of the second cavity 121, and the contact mode is line contact (abutting against each other in a line-to-line contact mode).

[0103] Laser penetration welding is performed on the line where the outer wall of the second inner structural profile 130 and the cavity wall of the second cavity 121 abut against each other, and the contact position between the outer wall of the second inner structural profile 130 and the cavity wall of the second cavity 121 is fused together to form a third weld 143 .

[0104] During the laser penetration welding process, a high energy density laser beam acts precisely on these opposing lines. The energy carried by the laser causes the outer wall of the first inner structural profile 120 and the cavity wall of the first cavity 111 to melt rapidly at the contact position, and then fuse together, eventually forming a first weld 141. These first welds 141 play a vital role in the structure of the entire composite hollow structural profile 100. They are like tough bonds that ensure a stable connection between the first inner structural profile 120 and the outer structural profile 110, providing a reliable structural guarantee for the composite hollow structural profile 100 when subjected to various external forces, so that it can maintain good performance in a complex use environment.

[0105] In some embodiments, optionally, when the number of the first inner structural profiles 120 is at least two, the composite hollow structural profile 100 further includes at least one support plate. The support plate is connected to the outer walls of two adjacent first inner structural profiles 120, and the support plate is connected to the cavity wall of the first cavity 111.

[0106] There is at least one support plate, that is, the number of support plates can be one, two or more. Considering factors such as spatial layout, structural strength and bearing capacity of the composite hollow structural profile 100, and material cost, the support plates are flexibly arranged.

[0107] By providing the support plate, the connection strength between adjacent structural profiles can be ensured, the bearing capacity of the composite hollow structural profile 100 can be improved, and the structural stability of the composite hollow structural profile 100 can be higher.

[0108] Optionally, the support plate has a first end and a second end that are oppositely disposed, the first end of the support plate is connected to outer walls of two adjacent first inner structural profiles 120 , and the second end of the support plate is connected to a cavity wall of the first cavity 111 .

[0109] Optionally, the thickness of the support plate gradually increases from the first end to the second end. This design method is conducive to further improving the connection strength between adjacent structural profiles and improving the bearing capacity of the composite hollow structural profile 100.

[0110] It should be emphasized that, when the structural strength and bearing capacity of the composite hollow structural profile 100 are sufficient, it is not necessary to provide a support plate in the first cavity 111 .

[0111] In a specific embodiment, the support plate is a steel plate. In other words, the support plate is made of steel.

[0112] In a specific embodiment, a first flame retardant and / or a first heat insulating member is disposed in the first cavity 111. The first flame retardant is a flame retardant material filled in the first cavity 111; and the first heat insulating member is a heat insulating material filled in the first cavity 111.

[0113] In a specific embodiment, a second flame retardant and / or a second heat insulating member is disposed in the second cavity 121. The second flame retardant is a flame retardant material filled in the second cavity 121; and the second heat insulating member is a heat insulating material filled in the second cavity 121.

[0114] In one embodiment, optionally, the second inner structural profile 130 is provided with a third cavity 131 along the first direction a. In other words, the second inner structural profile 130 is a hollow structure, and a third cavity 131 is provided inside the second inner structural profile 130, and the third cavity 131 is provided along the first direction a (the length direction of the composite hollow structural profile 100). The length direction of the third cavity 131 is consistent with the first direction a.

[0115] In a specific embodiment, a third flame retardant and / or a third heat insulating member is disposed in the third cavity 131. The third flame retardant is a flame retardant material filled in the third cavity 131; the third heat insulating member is a heat insulating material filled in the third cavity 131.

[0116] In one embodiment, optionally, the cross-sectional shape of the outer wall of the outer structural profile 110 may also be an ellipse. In the case where the cross-sectional shape of the outer wall of the outer structural profile 110 is an ellipse, the outer structural profile 110 may be understood as a flat tube structure.

[0117] In a specific embodiment, the first inner structural profile 120 is an H-shaped steel.

[0118] In a specific embodiment, Fig.13 As shown, the second inner structural profile 130 is an H-shaped steel.

[0119] This design approach can reduce the difficulty of processing the second inner structural profile 130 while ensuring that the structural strength and bearing capacity of the composite hollow structural profile 100 are improved.

[0120] In one embodiment, optionally, the length of the composite hollow structure profile 100 is 1 m to 1.5 m.

[0121] In a specific embodiment, the length of the composite hollow structural profile 100 is 1.2 m.

[0122] In a specific embodiment, the outer structural profile 110 is a square tube structure, and the first inner structural profile 120 is a round tube structure. In this case, the size of the outer structural profile 110 is 200 mm×200 mm×10 mm (where 10 mm is the thickness). The size of the first inner structural profile 120 is Φ178×10 mm (where Φ represents the diameter and 10 mm is the thickness).

[0123] In a specific embodiment, the outer structural profile 110 is a square tube structure, and the first inner structural profile 120 is also a square tube structure. In this case, the size of the outer structural profile 110 is 200 mm×200 mm×10 mm (where 10 mm is the thickness). The size of the first inner structural profile 120 is 143 mm×143 mm×10 mm (where 10 mm is the thickness).

[0124] In a specific embodiment, the outer structural profile 110 is a round tube structure, and the first inner structural profile 120 is a square tube structure. In this case, the size of the outer structural profile 110 is Φ193.7 mm×6.3 mm (where 6.3 mm is the thickness). The size of the first inner structural profile 120 is 143 mm×143 mm×10 mm (where 10 mm is the thickness).

[0125] It should be emphasized that the size limitations in the above content are only examples, and the size of the outer structural profile 110, the size of the first inner structural profile 120 and the size of the second inner structural profile 130 can be flexibly set according to actual needs.

[0126] In the technical solution defined in the present invention, by arranging the first inner structural profile 120 inside the outer structural profile 110, or arranging the second inner structural profile 130 inside the first inner structural profile 120, this design method can achieve a smaller cross-section at the same strength, and a higher strength at the same cross-section, and a wider range of applications, which can meet the requirements of some special working conditions.

[0127] In addition, the composite hollow structural profile 100 of the present invention can provide different materials in the structural combination to meet the functions of rust prevention, collision prevention and corrosion prevention.

[0128] It should be emphasized that the composite hollow structural profile 100 of the present invention can achieve a smaller cross-section and a greater bearing capacity compared to the structural profiles in the conventional technology, and can be used as a large-span, lighter structural member and in some special working conditions.

[0129] In the present invention, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise clearly defined. The terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0130] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “front” and “back” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, cannot be understood as a limitation on the present invention.

[0131] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0132] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A composite hollow structural profile, characterized in that: include: The outer structural profile (110) is provided with a first cavity (111) along a first direction, wherein the first direction is the length direction of the composite hollow structural profile; At least one first inner structural profile (120), the first inner structural profile (120) being arranged in the first cavity (111) along the first direction; Wherein, when the number of the first inner structural profile (120) is one, the outer wall of the first inner structural profile (120) abuts against the cavity wall of the first cavity (111), the first inner structural profile (120) and the outer structural profile (110) are relatively fixed by laser penetration welding, and there are at least two first welds (141) between the first inner structural profile (120) and the outer structural profile (110); When the number of the first inner structural profiles (120) is at least two, at least two of the first inner structural profiles (120) are arranged side by side in the first cavity (111), the outer wall of each of the first inner structural profiles (120) abuts against the cavity wall of the first cavity (111), the first inner structural profile (120) and the outer structural profile (110) are relatively fixed by laser penetration welding, and there are at least two first welds (141) between the first inner structural profile (120) and the outer structural profile (110); the outer walls of two adjacent first inner structural profiles (120) abut against each other, the two adjacent first inner structural profiles (120) are relatively fixed by laser penetration welding, and there is at least one second weld (142) between two adjacent first inner structural profiles (120).

2. The composite hollow structural profile according to claim 1, characterized in that: The first inner structural profile (120) is provided with a second cavity (121) along the first direction; The composite hollow structural profile also includes: At least one second inner structural profile (130), the second inner structural profile (130) being arranged in the second cavity (121) along the first direction, the outer wall of the second inner structural profile (130) being abutted against the cavity wall of the second cavity (121), the second inner structural profile (130) and the first inner structural profile (120) being relatively fixed by laser penetration welding, and the number of third welds (143) between the second inner structural profile (130) and the first inner structural profile (120) being at least two.

3. The composite hollow structural profile according to claim 2, characterized in that: The number of the second inner structural profiles (130) is less than the number of the first inner structural profiles (120), and the first inner structural profile (120) having the second inner structural profile (130) disposed therein is spaced from the first inner structural profile (120) not having the second inner structural profile (130) disposed therein.

4. The composite hollow structural profile according to claim 2, characterized in that: The number of the second inner structural profiles (130) is consistent with the number of the first inner structural profiles (120), and each of the second inner structural profiles (130) is arranged in a corresponding second cavity (121).

5. The composite hollow structural profile according to claim 2, characterized in that: The number of the second inner structural profiles (130) is greater than the number of the first inner structural profiles (120), at least two of the second inner structural profiles (130) are provided in at least one of the second cavities (121), and / or at least one of the second inner structural profiles (130) is provided in at least one of the second cavities (121).

6. The composite hollow structural profile according to any one of claims 2 to 5, characterized in that: The outer wall of the second inner structural profile (130) and the cavity wall of the second cavity (121) are fused together at the abutting position by means of laser penetration welding, and at least two third welds (143) are formed.

7. The composite hollow structural profile according to any one of claims 1 to 5, characterized in that: The outer wall of the first inner structural profile (120) and the cavity wall of the first cavity (111) are fused together at the abutting position by means of laser penetration welding, and at least two first welds (141) are formed.

8. The composite hollow structural profile according to any one of claims 1 to 5, characterized in that: The cross-sectional shape of the outer wall of the first inner structural profile (120) is circular or quadrilateral; When the cross-sectional shape of the outer wall of the first inner structural profile (120) is a quadrilateral, the outer wall of the first inner structural profile (120) has four first corner structures (122), and the first corner structures (122) are chamfered. After the chamfering, at least two of the first corner structures (122) are abutted against the cavity wall of the first cavity (111) and are fused together by laser penetration welding.

9. The composite hollow structural profile according to any one of claims 2 to 5, characterized in that: The cross-sectional shape of the outer wall of the second inner structural profile (130) is circular or quadrilateral; When the cross-sectional shape of the outer wall of the second inner structural profile (130) is a quadrilateral, the outer wall of the second inner structural profile (130) has four second corner structures (132), and the second corner structures (132) are chamfered. After the chamfering, at least two of the second corner structures (132) are abutted against the cavity wall of the second cavity (121) and are fused together by laser penetration welding.

10. The composite hollow structural profile according to any one of claims 2 to 5, characterized in that: The second inner structural profile (130) is an H-shaped steel.

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