Container groove welding structure and welding method

Abstract

The invention discloses a container groove welding structure and a welding method, which ensure the welding quality between a cylinder and a seal head, combine the advantages of a U-shaped groove and a V-shaped groove when the cylinder and the seal head are welded, and improve the strength and the sealing property of a welding seam. The container groove welding structure comprises semi-U + V-shaped grooves formed in the welding positions of the end socket and the barrel respectively, and when the end socket and the barrel are welded and in butt joint, the semi-U + V-shaped grooves of the end socket and the semi-U + V-shaped grooves of the barrel are in butt joint to form U + V-shaped groove welding seams. The section shape of the groove comprises a slope edge (301) and a slope bottom which are sequentially connected, the slope edge is in a straight line shape, and the slope bottom is in an arc shape.

Description

Technical Field

[0001] This invention relates to the field of welding auxiliary technology, specifically to a container bevel welding structure and welding method. Background Technology

[0002] A typical container structure consists of end caps 1 at both ends and a central cylinder 2. During container manufacturing, the end caps 1 and the cylinder 2 are connected by welding. Current methods employ beveling, where a bevel is a sloping or curved surface machined at the joint of the workpiece. This increases the root space, allowing the heat source to penetrate deeper into the welding area. Beveling is a crucial process for connecting various components of a container, and its welding quality directly affects the container's structural strength, sealing performance, and service life. A suitable beveling shape provides sufficient space for the weld pool, ensuring the filler metal and base metal fuse fully to form a strong bond. An improper beveling shape, such as an excessively small beveling angle or insufficient beveling depth, can lead to poor fusion between the filler metal and base metal, resulting in defects such as incomplete fusion and slag inclusions, severely impacting the weld strength and sealing performance. Sealed containers place higher demands on welding quality, and existing beveling techniques cannot meet the requirements for weld strength and sealing performance. Summary of the Invention

[0003] To address the problems in the prior art, this invention provides a container bevel welding structure and welding method that combines the advantages of U-shaped and V-shaped bevels when welding the cylinder and the end cap, ensuring the welding quality between the cylinder and the end cap and improving the strength and sealing of the weld.

[0004] To achieve the above objectives, the present invention provides a container bevel welding structure. The container includes a head and a cylinder. The container bevel welding structure includes semi-U+V shaped bevels respectively provided at the welding positions of the head and the cylinder. When the head and the cylinder are welded together, the semi-U+V shaped bevels of the head and the cylinder are joined to form a U+V shaped bevel weld. The cross-sectional shape of the bevel includes a bevel edge and a bevel bottom connected in sequence. The bevel edge is straight and the bevel bottom is arc-shaped.

[0005] Furthermore, the bottom of the slope is a blunt edge, which has a gradually changing size that matches the arc of the slope and is connected to the end cap or the wall of the cylinder.

[0006] Furthermore, the thickness t2 of the blunt edge is 1 to 1.2 mm.

[0007] Furthermore, the arc at the bottom of the slope extends upward from the edge of the blunt side.

[0008] Furthermore, the radius R of the arc at the bottom of the slope is 2.5 ± 0.1 mm.

[0009] Furthermore, the slope extends from the arc at the bottom of the slope to the outer surface of the end cap or the cylinder.

[0010] Furthermore, the angle α1 of the slope relative to the radial direction is 30±1°.

[0011] Furthermore, the straight line of the slope edge and the arc of the slope bottom are tangentially connected.

[0012] Furthermore, the end cap is open at one end, and the cylinder is hollow with open ends. The end cap includes a connected arc segment and a straight segment. The straight segment is connected to the cylinder. The slope bottom is located at the connecting edge of the straight segment and the cylinder. The wall thickness t1 of the end cap and the wall thickness t3 of the cylinder are 6.55±0.25mm.

[0013] The present invention also provides a container beveling welding method, which adopts the above-mentioned container beveling welding structure and includes the following steps:

[0014] (1) Make a semi-U+V shaped bevel at the welding parts of the head and the cylinder respectively;

[0015] (2) Fix the head and the cylinder together with a gap of 0 to 0.3 mm. The head and the cylinder are joined by a half U+V bevel to form a U+V bevel weld.

[0016] (3) Weld at the bevel weld to complete the container bevel welding.

[0017] Compared with the prior art, the welding structure of the present invention has semi-U+V shaped bevels on the welding edges of the end cap and the cylinder. The cross-sectional shape of the bevel includes a straight bevel edge and a circular arc bottom connected in sequence. The straight bevel edge forms a V-shaped edge, and the circular arc bottom forms a U-shaped half bottom. Thus, when welding, the semi-U+V shaped bevels of the end cap and the cylinder are joined to form a U+V shaped bevel weld. The U+V shaped bevel weld combines the characteristics of U-shaped and V-shaped bevels: the U+V shaped bevel weld requires less filler metal, which can save welding materials and reduce costs; its bevel shape makes the welding heat distribution relatively uniform, thereby reducing welding residual stress and the degree of deformation; although the processing difficulty is relatively higher, it can reduce the number of welding layers and welding time to a certain extent, and improve welding efficiency; it is conducive to the penetration of the weld root, improves the quality of the weld and the strength of the joint, and ensures the welding quality. Simultaneously, lower welding voltage and current can be selected during welding to control the welding heat input and reduce welding deformation. The weld formation is aesthetically pleasing and defect-free, with a smooth and flat surface, small and uniform reinforcement height, and moderate and uniform width. X-ray inspection is used to check the internal quality of the weld, revealing no defects such as porosity, slag inclusions, or incomplete penetration. This ensures the welding quality between the cylinder and the head, improves the weld strength and sealing performance, and meets the higher quality requirements of sealed containers.

[0018] The welding method of the present invention adopts the above-mentioned bevel welding structure. After the cylinder and the end cap are fixedly joined, a U+V bevel weld is formed by joining the half-U+V bevel of the end cap and the half-U+V bevel of the cylinder. The welding combines the advantages of the U-shaped bevel and the V-shaped bevel, which ensures the welding quality between the cylinder and the end cap and improves the strength and sealing of the weld. Attached Figure Description

[0019] Figure 1 This is a structural diagram of the end cap;

[0020] Figure 2 yes Figure 1 A magnified view of a section at point A in the middle;

[0021] Figure 3 This is a schematic diagram of the cylinder structure;

[0022] Figure 4 This is a structural diagram of the welding bevel when the end cap and the cylinder are joined together;

[0023] Wherein, 1 is the end cap, 2 is the cylinder, 3 is the bevel, 301 is the bevel edge, 302 is the bevel bottom, 303 is the blunt edge, H1 is the inner cavity height of the straight section of the end cap, H2 is the inner cavity height of the arc section of the end cap, t1 is the wall thickness of the end cap, φ1 is the inner diameter of the straight section of the end cap, α1 is the angle of the bevel edge relative to the radial direction, R is the radius of the bevel bottom, t2 is the thickness of the blunt edge, L is the length of the cylinder, φ2 is the inner diameter of the cylinder, t3 is the wall thickness of the cylinder, and α is the included angle between the two bevel edges of the bevel. Detailed Implementation

[0024] The present invention will be further explained and described below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0025] This invention first provides a container bevel welding structure, see details below. Figure 1 , Figure 2 , Figure 3 and Figure 4 The container includes a head 1 and a cylinder 2. The container bevel welding structure includes a semi-U+V shaped bevel 3 set at the welding positions of the head 1 and the cylinder 2 respectively. When the head 1 and the cylinder 2 are welded together, the semi-U+V shaped bevel 3 of the head 1 and the semi-U+V shaped bevel 3 of the cylinder 2 are joined to form a U+V shaped bevel weld. The cross-sectional shape of the bevel 3 includes a bevel edge 301 and a bevel bottom 302 connected in sequence. The bevel edge 301 is straight and the bevel bottom 302 is arc-shaped.

[0026] In this embodiment of the invention, the welding structure has semi-U+V shaped bevels 3 on the welding edges of the end cap 1 and the cylinder 2. The cross-sectional shape of the bevel 3 includes a straight bevel edge 301 and an arc-shaped bevel bottom 302 connected in sequence. The straight bevel edge 301 forms a V-shaped edge, and the arc-shaped bevel bottom 302 forms a U-shaped half-bottom. Thus, during welding, the end cap 1 and the cylinder 2 form a U+V shaped bevel weld by connecting the semi-U+V shaped bevels 3. The U+V shaped bevel weld combines the characteristics of U-shaped and V-shaped bevels: the U+V shaped bevel weld requires less filler metal, which can save welding materials and reduce costs; its bevel shape makes the welding heat distribution relatively uniform, thereby reducing welding residual stress and the degree of deformation; although the processing difficulty is relatively higher, it can reduce the number of welding layers and welding time to a certain extent, and improve welding efficiency; it is conducive to the penetration of the weld root, improves the quality of the weld and the strength of the joint, and ensures the welding quality. Simultaneously, lower welding voltage and current can be selected during welding to control the welding heat input and reduce welding deformation. The weld formation is aesthetically pleasing and defect-free, with a smooth and flat surface, small and uniform reinforcement height, and moderate and uniform width. X-ray inspection is used to check the internal quality of the weld, revealing no defects such as porosity, slag inclusions, or incomplete penetration. This ensures the welding quality between cylinder 2 and head 1, improves the weld strength and sealing performance, and meets the higher quality requirements of sealed containers.

[0027] The container of this invention includes end caps 1 at both ends and a cylindrical body 2 between the two end caps 1. The end caps 1 are open at one end, and the cylindrical body 2 is hollow with open ends. In this embodiment, the cylindrical body 2 is a hollow cylindrical tube. The end caps 1 include a connecting arc segment and a straight segment. The straight segment is connected to the cylindrical body 2. The slope bottom 302 is provided at the connecting edge of the straight segment and the cylindrical body 2. The wall thickness t1 of the end caps 1 and the wall thickness t3 of the cylindrical body 2 are 6.55±0.25mm. The inner cavity height H1 of the straight section of end cap 1 is 20±0.05mm, and the inner cavity height H2 of the arc section of end cap 1 is 32±0.05mm, which is the maximum height of the inner cavity of the arc section. The inner diameter φ1 of the straight section of end cap 1 is 128±0.2mm. The length L of the cylinder 2 is 637±0.2mm, and the inner diameter φ2 of the cylinder 2 is 128±0.2mm. The surface roughness of both the outer surface and the inner cavity surface of end cap 1 and cylinder 2 is guaranteed to be 1.6. The inner diameter deviation of the welded end cap 1 and cylinder 2 is less than 0.1mm, thus ensuring the quality of the finished product. Of course, in other embodiments, cylinder 2 can also be a variable diameter cylinder structure, and end cap 1 can also be other shapes that are suitable for it. The welding structure of this embodiment has wide applicability and is not limited to the shapes of end cap 1 and cylinder 2 given in this embodiment.

[0028] Specifically, the bottom of the slope bottom 302 is a blunt edge 303. The blunt edge 303 has a gradually changing size that matches the arc of the slope bottom 302 and connects to the wall of the end cap 1 or the cylinder 2. That is, the bevel 3 is set at the end edge of the end cap 1 and the cylinder 2. The cross-sectional shape of the bevel 3 extends inward from the outer surface of the end edge of the end cap 1 and the cylinder 2 to the side edge of the blunt edge 303. The thickness t2 of the blunt edge 303 is 1 to 1.2 mm. The thickness t2 of the blunt edge 303 refers to the thickness of the blunt edge 303 at the very bottom of the slope bottom 302, that is, the minimum thickness of the blunt edge 303. In this embodiment, it refers to the thickness corresponding to the straight edge of the blunt edge 303. The setting of the blunt edge 303 and the selection of its thickness prevent burn-through during welding, while retaining a straight edge with a thickness of 1 to 1.2 mm to ensure root fusion of the weld, balancing the dual requirements of preventing burn-through and penetration.

[0029] More specifically, the arc of the slope bottom 302 extends upward from the edge of the blunt edge 303, that is, the arc transitions obliquely upward from the straight edge of the blunt edge 303. The radius R of the arc of the slope bottom 302 is 2.5±0.1mm. The arc of the slope bottom 302 forms a curved surface structure with rounded bottom corners, thus providing sufficient space for welding material to be contained during welding, forming a molten pool, enhancing the fluidity of the welding material, improving the utilization rate and penetration of the welding material, improving the bonding strength between the welding material and the head 1 and the cylinder 2, and improving the welding quality.

[0030] More specifically, the bevel edge 301 extends from the arc of the slope bottom 302 to the outer surface of the head 1 or the cylinder 2. The angle α1 of the bevel edge 301 relative to the radial direction is 30±1°, where the radial direction is perpendicular to the axis of the container. The straight bevel edge 301 forms a single-sided inclined structure. The selection of the included angle can control the heat input during welding, and at the same time, it is beneficial to the melting of the welding material and the melting out of bubbles, slag inclusions, etc., which helps to improve the welding quality, enhance the welding strength and airtightness. In addition, the straight line of the bevel edge 301 and the arc of the slope bottom 302 are tangentially transitioned. This improves the uniform and smooth transition between the bevel edge 301 and the slope bottom 302, enabling the welding material to reliably melt and weld within the U+V shaped groove weld, and improving the bonding strength between the welding material and the head 1 and the cylinder 2.

[0031] In this embodiment, when the end cap 1 and the bevel 3 of the cylinder 2 are fixedly connected, the connection gap is reliably guaranteed to be 0-0.3mm. The end cap 1 and the half U+V bevel 3 of the cylinder 2 are connected to form a U+V bevel weld. The included angle α between the two opposite bevel edges 301 of the bevel weld is 60±2°. The two bevel bottoms 302 form an arc with a diameter R of 2.5±0.1mm. The straight lines of the two bevel bottoms 302 are tangent to the arcs and transition to the arcs. The straight edges of the two blunt edges 303 are tightly fitted and reliably connected.

[0032] The present invention also provides a container beveling welding method, which adopts the above-mentioned container beveling welding structure and includes the following steps:

[0033] (1) A semi-U+V shaped bevel 3 is made at the welding parts of the head 1 and the cylinder 2 respectively;

[0034] (2) Fix the end cap 1 and the cylinder 2 together with a gap of 0 to 0.3 mm. The half U+V bevel 3 of the end cap 1 and the cylinder 2 are joined to form a U+V bevel weld.

[0035] (3) Weld at the bevel weld to complete the container bevel welding.

[0036] The method specifically employs tungsten inert gas (GTAW) welding. Welding is initiated approximately 2 minutes after argon gas protection. Other welding processes can also be used, depending on the desired weld quality. In this embodiment, the container bevel welding structure utilizes the semi-U+V bevel 3 of the end cap 1 and the cylinder 2 to form a U+V bevel weld. Compared to simple U-shaped or V-shaped welds, this method requires less filler metal, saving welding materials and reducing costs. The bevel shape ensures relatively uniform heat distribution, reducing residual stress and deformation. It also reduces the number of welding layers and welding time, improving welding efficiency. Furthermore, it promotes root penetration, enhancing weld quality and joint strength, thus ensuring overall weld quality. The use of GTAW, by reducing filler material, allows for the selection of lower welding voltage and current, controlling heat input and minimizing welding deformation. The resulting weld is aesthetically pleasing, defect-free, smooth, with a small and uniform reinforcement height and moderate, uniform width. X-ray inspection was used to check the internal quality of the weld, and no defects such as porosity, slag inclusion, or incomplete penetration were found. This ensured the welding quality between cylinder 2 and head 1, improved the weld strength and sealing performance, and met the higher quality requirements for welds in sealed containers.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A container bevel welding structure, characterized in that, The container includes a head (1) and a cylinder (2). The container bevel welding structure includes a semi-U+V shaped bevel (3) provided at the welding positions of the head (1) and the cylinder (2). When the head (1) and the cylinder (2) are welded together, the semi-U+V shaped bevel (3) of the head (1) and the semi-U+V shaped bevel (3) of the cylinder (2) are joined to form a U+V shaped bevel weld. The cross-sectional shape of the bevel (3) includes a bevel edge (301) and a bevel bottom (302) connected in sequence. The bevel edge (301) is straight and the bevel bottom (302) is arc-shaped.

2. The container bevel welding structure according to claim 1, characterized in that, The bottom of the slope bottom (302) is a blunt edge (303), which has a gradually changing size that matches the arc of the slope bottom (302) and is connected to the wall of the end cap (1) or the cylinder (2).

3. The container bevel welding structure according to claim 2, characterized in that, The thickness t2 of the blunt edge (303) is 1 to 1.2 mm.

4. The container bevel welding structure according to claim 2, characterized in that, The arc of the bottom slope (302) extends upward from the edge of the blunt side (303).

5. The container bevel welding structure according to claim 4, characterized in that, The radius R of the arc at the bottom of the slope (302) is 2.5 ± 0.1 mm.

6. The container bevel welding structure according to claim 4, characterized in that, The slope edge (301) extends from the arc of the slope bottom (302) to the outer surface of the end cap (1) or the cylinder (2).

7. The container bevel welding structure according to claim 6, characterized in that, The angle α1 of the slope edge (301) relative to the radial direction is 30±1°.

8. A container bevel welding structure according to any one of claims 1 to 7, characterized in that, The straight line of the slope edge (301) and the arc of the slope bottom (302) are tangentially connected.

9. A container bevel welding structure according to any one of claims 1 to 7, characterized in that, The end cap (1) is open at one end, and the cylinder (2) is hollow with open ends. The end cap (1) includes a connecting arc segment and a straight segment. The straight segment is connected to the cylinder (2). The slope bottom (302) is located at the connecting edge of the straight segment and the cylinder (2). The wall thickness t1 of the end cap (1) and the wall thickness t3 of the cylinder (2) are 6.55±0.25mm.

10. A method for beveling a container, characterized in that, The container bevel welding structure according to any one of claims 1 to 9 includes the following steps: (1) Make a semi-U+V shaped bevel (3) at the welding parts of the head (1) and the cylinder (2); (2) Fix the end cap (1) and the cylinder (2) together with a gap of 0 to 0.3 mm. The half U+V bevel (3) of the end cap (1) and the cylinder (2) are joined to form a U+V bevel weld. (3) Weld at the bevel weld to complete the container bevel welding.

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