Stainless steel composite steel angle joint welding structure and mechanical property testing device
By adopting a 60° V-shaped bevel and partition welding method in the welding structure of stainless steel composite steel angle joints, the problem of poor welding performance of stainless steel composite steel angle joints in the prior art is solved, and the welding structure is simplified and the mechanical properties are improved.
Patent Information
- Application Number
- CN202411899241.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-23
- Publication Date
- 2025-04-11
AI Technical Summary
When dealing with the welding structure of corner joints of stainless steel composite steel, there are problems of welding performance deterioration caused by carbon element migration and diffusion, alloy element dilution, and differences in physical properties of base and composite materials. The existing standards require the use of three types of welding materials, which can easily lead to mixed or misuse of welding materials.
A welding structure of stainless steel composite steel angle joints is proposed, using a 60° V-shaped bevel, and the weld includes the base layer area, the transition layer area and the composite layer area in sequence. The transition layer area and the composite layer area use welding materials that match the strength of the composite layer stainless steel, and the base area uses welding materials that match the strength of the base low alloy steel.
The welding structure is simplified, the types of welding materials are reduced, the welding costs and the risk of misuse or mixed welding materials are reduced, and the mechanical performance of stainless steel composite steel angle joints is improved.
Smart Images
Figure CN119804137A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of structural engineering, and in particular to a stainless steel composite steel corner joint welding structure and a mechanical property testing device. Background Art
[0002] In the face of the corrosion problem of steel structures, the traditional method mainly improves its corrosion resistance through anti-corrosion coatings, but there are mainly the following problems: the cost of anti-corrosion coatings is high, the durability of the coatings themselves is not easy to be guaranteed, and the spraying of anti-corrosion coatings in offshore or marine engineering is prone to water pollution and high environmental risks. In order to solve the problems of anti-corrosion coatings, new materials represented by high-performance steels have begun to receive more and more attention, such as weathering steel and new stainless steels. Among them, the surface oxide layer of weathering steel will gradually turn black and brown as the corrosion time increases, seriously affecting the appearance. Stainless steel contains a large amount of alloy elements such as Ni and Cr, and its overall material cost is high, which is not conducive to large-scale engineering applications in the construction field. Against the above background, new composite steels have emerged. Through the composite process, stainless steel and low-alloy steel with different characteristics are combined together. While retaining the performance advantages of the two metals, the overall production cost of the material can be reduced, and high performance (such as corrosion resistance) and low cost can be well balanced.
[0003] Due to the special nature of double-layer metal, stainless steel composite steel has large differences in physical properties and chemical composition between the base and composite materials. Especially for special joints (such as corner joints), carbon element migration and diffusion, alloy element dilution, and uneven deformation of the base and composite due to differences in physical properties are prone to occur, causing deterioration of the performance of the welded joint, thus affecting the welding quality of the entire component. The existing standards involve welding structural recommendations for stainless steel composite steel corner joints, but they require the use of three welding materials, which can easily cause problems such as mixing or misusing welding materials.
[0004] Therefore, it is necessary to simplify the welding structure in a targeted manner and test its mechanical properties to provide welding technical support for composite steel components. Summary of the invention
[0005] Purpose of the invention: In view of the shortcomings and defects of the prior art, the present invention provides a stainless steel composite steel corner joint welding structure and a mechanical property testing device, proposes a stainless steel composite steel corner joint welding structure suitable for structural engineering, and proposes a testing device that is convenient for testing the performance of stainless steel composite steel corner joints, providing welding technical support for composite steel components.
[0006] Technical solution: The welding structure of the stainless steel composite steel corner joint of the present invention is characterized in that the stainless steel composite steel includes a base low alloy steel and a composite stainless steel, the groove form of the stainless steel composite steel corner joint is a 60° V-shaped groove, and the weld includes a base area, a transition layer area and a composite area from the inside to the outside; the thickness of the composite area is not less than the thickness of the composite stainless steel; the thickness of the transition layer area is not less than 2 mm.
[0007] The transition layer region and the composite layer region are welded using corresponding composite stainless steel welding materials that match the strength of the composite stainless steel, and the base region is welded using corresponding base low alloy steel welding materials that match the strength of the base low alloy steel.
[0008] Wherein, the base layer area, transition layer area and composite layer area are all welded with corresponding composite stainless steel welding materials matching the strength of the composite stainless steel.
[0009] The corner joint specimen of the stainless steel composite steel corner joint welding structure of the present invention is characterized by: comprising a corner joint specimen, the corner joint specimen comprising a base layer of low alloy steel, a composite layer of stainless steel and a weld, the upper end cross-section of the vertical plate of the corner joint specimen is enlarged, the vertical plate is provided with screw holes for loading connection, and the width of the enlarged cross-section of the vertical plate is greater than the width of the plate at the connecting weld.
[0010] The mechanical property testing device of the present invention is characterized by being a device for testing the mechanical properties of a diagonal joint specimen.
[0011] The mechanical property testing device of the present invention is characterized in that it includes a test bench, a thick cover plate is provided on the test bench, a pad is provided at the bottom of the thick cover plate, and the thick cover plate is connected to the test bench through high-strength bolts at both ends; the corner joint specimen is located between the thick cover plate and the ear plate welding fixture, and the ear plate welding fixture is connected to the jack.
[0012] Wherein, the test bench base fixes the corner joint specimen by means of ground anchor bolts, and the test bench base is located on the floor of the test room.
[0013] Wherein, the thick cover plate is used to fix the corner joint specimen on the test bench, and bolt holes are provided at both ends of the thick cover plate.
[0014] Among them, the ear plate welding tooling includes a flat plate and two groups of double ear plates. The two groups of double ear plates are respectively welded on both sides of the flat plate and are perpendicular to each other, and are respectively used to connect the corner joint specimen and the jack.
[0015] Among them, a bolt hole is opened in the center of the pad, the hole diameter is the same as the bolt hole diameter at both ends of the thick cover plate, and the thickness of the pad is the same as the thickness of the corner joint specimen.
[0016] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages: The present invention proposes a simplified welding structure of a stainless steel composite steel corner joint, providing welding technology support for composite steel components. The present invention can expand the application of composite steel to box-section components, etc., and promote the application of stainless steel composite steel in structural engineering. Compared with the stainless steel composite steel corner joint structure specified in the current standard, the corner joint welding structure of the present invention reduces the types of welding materials, reduces welding costs and the risk of misuse or mixing of welding materials. Through the technical solution of the present invention, it is easy to obtain the mechanical performance of stainless steel composite steel corner joints. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a structural schematic diagram of the corner joint groove structure of the present invention;
[0018] Figure 2 It is a structural schematic diagram of a fillet joint welding structure 1 of the present invention;
[0019] Figure 3 It is a structural schematic diagram of the second corner joint welding structure of the present invention;
[0020] Figure 4 It is a schematic structural diagram of a corner joint specimen of the present invention;
[0021] Figure 5 It is a structural schematic diagram of the mechanical property testing device of the present invention in a vertical loading state;
[0022] Figure 6 It is a structural schematic diagram of the mechanical property testing device of the present invention in a horizontal loading state;
[0023] Figure 7 It is a structural schematic diagram of the test bench of the present invention;
[0024] Figure 8 It is a structural schematic diagram of a thick cover plate of the present invention;
[0025] Fig. 9 It is a structural schematic diagram of the ear plate welding tool of the present invention;
[0026] Fig.10 It is a structural schematic diagram of the pad of the present invention;
[0027] In the figure, 1 is the corner joint specimen; 2 is the ear plate welding tooling; 3 is the thick cover plate; 4 is the pad; 5 is the high-strength bolt; 6 is the test bench; 7 is the test room floor; 8 is the jack; 11 is the vertical plate; 12 is the weld; 13 is the base low alloy steel; 14 is the composite stainless steel; 15 is the corresponding base low alloy steel welding material; 16 is the corresponding composite stainless steel welding material; 17 is the base area; 18 is the transition layer area; 19 is the composite area. DETAILED DESCRIPTION
[0028] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and specific implementation methods.
[0029] The stainless steel composite steel corner joint welding structure of the present invention comprises a base low alloy steel 13 and a composite stainless steel 14. The groove form of the stainless steel composite steel corner joint is a 60° V-shaped groove. The weld 12 comprises a base region 17, a transition layer region 18 and a composite region 19 from the inside to the outside. The thickness of the composite region 19 is not less than the thickness of the composite stainless steel 14. The thickness of the transition layer region 18 is not less than 2 mm.
[0030] Corner joint welding structure 1: the transition layer area 18 and the composite layer area 19 are welded using corresponding composite stainless steel welding materials 16 that match the strength of the composite stainless steel 14, and the base area 17 is welded using corresponding base low alloy steel welding materials 15 that match the strength of the base low alloy steel 13.
[0031] Corner joint welding structure 2: the base layer area 17 , the transition layer area 18 and the composite layer area 19 are all welded with corresponding composite stainless steel welding materials 16 that match the strength of the composite stainless steel 14 .
[0032] The corner joint specimen of the stainless steel composite steel corner joint welding structure of the present invention includes a corner joint specimen 1, which includes a base low alloy steel 13, a composite stainless steel 14 and a weld 12. The upper end cross-section of the vertical plate 11 of the corner joint specimen 1 is enlarged, and the vertical plate 11 is provided with a screw hole for loading connection. The width of the enlarged cross-section of the vertical plate 11 is greater than the width of the plate at the connecting weld.
[0033] The mechanical property testing device of the present invention is a device for testing the mechanical properties of a corner joint specimen. It includes a test bench 6, a thick cover plate 3 is provided on the test bench 6, a pad 4 is provided at the bottom of the thick cover plate 3, and the thick cover plate 3 is connected to the test bench 6 through high-strength bolts 5 at both ends; the corner joint specimen 1 is located between the thick cover plate 3 and the ear plate welding fixture 2, and the ear plate welding fixture 2 is connected to the jack 8. Among them, the test bench 6 fixes the corner joint specimen 1 through anchor bolts, and the test bench 6 is located on the floor 7 of the laboratory. The thick cover plate 3 is used to fix the corner joint specimen 1 on the test bench, and bolt holes are provided at both ends of the thick cover plate 3. The ear plate welding fixture 2 includes a flat plate and two groups of double ear plates, and the two groups of double ear plates are respectively welded on both sides of the flat plate and are perpendicular to each other, and are respectively used to connect the corner joint specimen 1 and the jack 8. A bolt hole is provided in the center of the pad 4, and the hole diameter is the same as the hole diameter of the bolt holes at both ends of the thick cover plate 3, and the thickness of the pad 4 is the same as the thickness of the corner joint specimen 1.
[0034] The present invention proposes a simplified welding structure of a stainless steel composite steel corner joint, providing welding technology support for composite steel components. The present invention can expand the application of composite steel to box-section components, etc., and promote the application of stainless steel composite steel in structural engineering. Compared with the stainless steel composite steel corner joint structure specified in the current standard, the corner joint welding structure of the present invention reduces the types of welding materials, reduces welding costs and the risk of misuse or mixing of welding materials. Through the technical solution of the present invention, it is easy to obtain the mechanical performance of stainless steel composite steel corner joints.
Claims
1. Stainless steel composite steel corner joint welding structure, characterized by: The stainless steel composite steel comprises a base low alloy steel (13) and a composite stainless steel (14); the groove of the stainless steel composite steel corner joint is a 60° V-shaped groove; the weld (12) comprises a base region (17), a transition layer region (18) and a composite region (19) from the inside to the outside; the thickness of the composite region (19) is not less than the thickness of the composite stainless steel (14); and the thickness of the transition layer region (18) is not less than 2 mm.
2. The stainless steel composite steel fillet joint welding structure according to claim 1, characterized in that: The transition layer region (18) and the composite layer region (19) are welded using corresponding composite stainless steel welding materials (16) whose strength matches that of the composite stainless steel (14), and the base region (17) is welded using corresponding base low alloy steel welding materials (15) whose strength matches that of the base low alloy steel (13).
3. The stainless steel composite steel fillet joint welding structure according to claim 1, characterized in that: The base layer region (17), transition layer region (18) and composite layer region (19) are all welded using corresponding composite stainless steel welding materials (16) that match the strength of the composite stainless steel (14).
4. The fillet joint test piece of the stainless steel composite steel fillet joint welding structure according to any one of claims 1 to 3, characterized in that: The invention comprises a corner joint specimen (1), wherein the corner joint specimen (1) comprises a base layer of low alloy steel (13), a composite layer of stainless steel (14) and a weld (12), wherein the upper end cross section of a vertical plate (11) of the corner joint specimen (1) is enlarged, and a screw hole for loading connection is provided on the vertical plate (11), and the width of the enlarged cross section of the vertical plate (11) is greater than the width of the plate at the connection weld.
5. Mechanical properties testing device, characterized in that: A device for testing the mechanical properties of the corner joint specimen described in claim 4.
6. The mechanical properties testing device according to claim 6, characterized in that: The invention comprises a test bench seat (6), a thick cover plate (3) is provided on the test bench seat (6), a pad (4) is provided at the bottom of the thick cover plate (3), and the thick cover plate (3) is connected to the test bench seat (6) via high-strength bolts (5) at both ends; the corner joint test piece (1) is located between the thick cover plate (3) and the ear plate welding fixture (2), and the ear plate welding fixture (2) is connected to a jack (8).
7. The mechanical properties testing device according to claim 7, characterized in that: The test bench (6) fixes the corner joint test piece (1) via ground anchor bolts, and the test bench (6) is located on the test room floor (7).
8. The mechanical properties testing device according to claim 8, characterized in that: The thick cover plate (3) is used to fix the corner joint test piece (1) on the test bench, and bolt holes are provided at both ends of the thick cover plate (3).
9. The mechanical properties testing device according to claim 9, characterized in that: The ear plate welding tool (2) comprises a flat plate and two sets of double ear plates. The two sets of double ear plates are respectively welded to two sides of the flat plate and are perpendicular to each other, and are respectively used to connect the corner joint specimen (1) and the jack (8).
10. The mechanical properties testing device according to claim 10, characterized in that: The center of the pad (4) is provided with a bolt hole, the diameter of which is the same as the diameter of the bolt holes at both ends of the thick cover plate (3), and the thickness of the pad (4) is the same as the thickness of the corner joint test piece (1).