Welding groove and welding method for narrow gap between seat ring plate and fixed guide vane of water pumping and storing turbine

Abstract

The invention discloses a narrow gap welding groove between a water pumping and storing turbine seat ring plate and a fixed guide vane and a welding method, and belongs to the technical field of narrow gap welding. The fixed guide vane comprises a fixed guide vane body, the upper side and the lower side of the fixed guide vane body are arranged to be end faces, the left side and the right side of the fixed guide vane body are arranged to be an A wing-shaped face and a B wing-shaped face respectively, two narrow-gap welding grooves are machined in the end faces, the opening directions of the narrow-gap welding grooves are opposite, and groove faces are arranged at the bottoms of the narrow-gap welding grooves. And a groove root truncated edge is arranged on one side, opposite to the opening, of the groove surface. The problems that the reachability of the space position of a narrow-gap welding gun is limited, and full-length welding of a welding seam cannot be achieved are solved, the welding quality and efficiency of products are improved, and the intelligent degree of hydroelectric equipment manufacturing is improved.

Description

Technical Field

[0001] This invention relates to a narrow gap welding groove and welding method between the ring plate of a pumped storage turbine base and the fixed guide vane, belonging to the field of narrow gap welding technology. Background Technology

[0002] The pumped-storage turbine mounting ring is a crucial load-bearing and water-guiding component in the turbine unit, playing a vital role in the stable operation and power generation efficiency of the unit. The mounting ring is assembled by welding a ring plate and multiple circumferentially distributed fixed guide vanes. A T-joint is formed between the fixed guide vanes and the ring plate. Due to the thickness of the fixed guide vanes, the bevel shape of the joint significantly affects the welding efficiency and quality.

[0003] Current robotic narrow-gap welding technology involves a robot holding a narrow-gap welding torch for welding. Simultaneously, a corresponding narrow-gap bevel needs to be cut between the fixed guide vanes and the ring plate. Currently used narrow-gap bevels are all single-sided bevels, such as the "Thick Section Narrow Gap T-Type Welding Joint Structure" disclosed in patent number CN202020748486.8, which introduces a narrow-gap T-type welding joint structure for thick plate welding in the hydropower industry, changing the arc-shaped weld bead to a straight weld bead. However, this technical solution has significant shortcomings: the welding bevel is single-sided, while the overall size of the pumped-storage turbine unit's seat ring is relatively small, and the corresponding spacing between the fixed guide vanes is very small, limiting the spatial accessibility of the narrow-gap welding torch and preventing full-length welding of the weld seam.

[0004] Therefore, it is urgent to propose a welding groove and welding method for the narrow gap between the pumped storage turbine base ring plate and the fixed guide vane in order to solve the above-mentioned technical problems. Summary of the Invention

[0005] The purpose of this invention is to solve the problem of limited spatial accessibility of narrow-gap welding torches, which prevents full-length welding of the weld seam. A brief overview of the invention is provided below to offer a basic understanding of certain aspects thereof. It should be understood that this overview is not an exhaustive summary of the invention. It is not intended to identify key or essential parts of the invention, nor is it intended to limit the scope of the invention.

[0006] The technical solution of the present invention:

[0007] Option 1: A narrow gap welding bevel between the ring plate of a pumped-storage turbine base and a fixed guide vane, comprising a fixed guide vane, wherein the upper and lower sides of the fixed guide vane are configured as end faces, and the left and right sides of the fixed guide vane are configured as airfoil A and airfoil B, respectively. Two narrow gap welding bevels are machined on the end faces, the opening directions of the narrow gap welding bevels are arranged opposite to each other, the bottom of the narrow gap welding bevel is provided with a bevel surface, and the bevel surface is provided with a bevel root blunt edge on the side of the opening opposite to the opening.

[0008] Preferably, the curvature of airfoil A is greater than the curvature of airfoil B.

[0009] Preferably, the maximum distance between airfoil A and airfoil B is 150mm, and the minimum distance between airfoil A and airfoil B is 0mm.

[0010] Preferably, the two end faces on the upper and lower sides of the fixed guide vane are parallel to each other and the maximum distance between them is 350mm.

[0011] Preferably, the blunt edges at the root of the two narrow gap welding grooves are respectively located on the left and right sides of the two airfoils of airfoil A and airfoil B, and are connected in the middle area of ​​the end face to form an S-shaped blunt edge.

[0012] Preferably, the thickness a of the blunt edge at the root of the bevel is 4~6mm, the width b is 14~16mm, and it is machined with a rounded corner R, the radius of which is 7~10mm.

[0013] Preferably, the slope of the bevel surface is 1~2°.

[0014] Option 2: A welding method for a narrow gap welding bevel between the pumped-storage turbine base ring plate and the fixed guide vane, as described in Option 1, comprising the following steps:

[0015] S1. Machining two narrow-gap welding bevels on the end face of the fixed guide vane;

[0016] S2. Assemble the fixed guide vane and the ring plate together to form a narrow gap weld with a T-joint between the narrow gap welding groove and the surface of the ring plate.

[0017] S3. Use dual robots to hold narrow gap welding guns and weld simultaneously on the A and B airfoil sides to melt through the blunt edge of the bevel root of the transition connection in the middle area of ​​the end face, ensuring welding quality and controlling welding deformation.

[0018] S4. During the welding process, use multi-layer multi-pass offset or laser tracking offset to weld until the narrow gap weld is filled.

[0019] The present invention has the following beneficial effects:

[0020] 1. This invention changes the opening direction of the narrow gap bevel from one side to both sides of the A and B airfoil surfaces. By using the tilted and staggered assembly of the fixed guide vane, the welding positions are all in open space, which greatly improves the spatial accessibility of the narrow gap welding gun and enhances the adaptability of narrow gap welding in the welding of the pumped storage turbine base ring plate and the fixed guide vane.

[0021] 2. This invention uses a robot to hold a narrow-gap welding torch for welding the pumping station ring, which improves the welding quality and efficiency of the product and enhances the level of intelligence in hydropower equipment manufacturing. Attached Figure Description

[0022] Figure 1 This is a perspective view of the fixed guide vane of the present invention;

[0023] Figure 2 This is a schematic diagram of a narrow gap welding bevel for a fixed guide vane;

[0024] Figure 3 This is a schematic diagram of the assembly of the fixed guide vane and the ring plate;

[0025] Figure 4 This is a schematic diagram illustrating the usage state of a narrow gap welded bevel between the ring plate of a pumped-storage turbine base and the fixed guide vane.

[0026] In the figure: 1-fixed guide vane, 2-A airfoil surface, 3-end face, 4-B airfoil surface, 5-bevel root blunt edge, 6-bevel surface, 7-ring plate, 8-narrow gap weld, 9-narrow gap welding gun. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this invention clearer, the invention is described below with reference to specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0028] The connections mentioned in this invention are divided into fixed connections and detachable connections. Fixed connections, also known as non-detachable connections, include but are not limited to conventional fixed connection methods such as folded connections, riveted connections, adhesive connections, and welded connections. Detachable connections include but are not limited to conventional disassembly methods such as threaded connections, snap-fit ​​connections, pin connections, and hinged connections. When a specific connection method is not explicitly defined, it is assumed that at least one existing connection method can always be found to achieve the function, and those skilled in the art can choose according to their needs. For example, a welded connection can be chosen for fixed connections, and a hinged connection can be chosen for detachable connections.

[0029] Specific implementation method one: Combining Figures 1-4This embodiment describes a narrow gap welding bevel between a pumped-storage turbine base ring plate and a fixed guide vane. The fixed guide vane 1 is a spatial body composed of four surfaces. The upper and lower sides of the fixed guide vane 1 are end faces 3, and the left and right sides are respectively an A-airfoil 2 and a B-airfoil 4. Two narrow gap welding bevels are machined on the end face 3, dividing it into two parts. The opening directions of the narrow gap welding bevels are opposite to each other. A bevel surface 6 is provided at the bottom of the narrow gap welding bevel, and a bevel root blunt edge 5 is provided on the side of the opening of the bevel surface 6 facing away from the bevel.

[0030] The curvature of airfoil A 2 is greater than that of airfoil B 4.

[0031] The maximum distance between airfoil A 2 and airfoil B 4 is 150mm, and the minimum distance between airfoil A 2 and airfoil B 4 is 0mm.

[0032] The two end faces 3 on the upper and lower sides of the fixed guide vane 1 are parallel to each other and the maximum distance between them is 350mm.

[0033] The blunt edges 5 at the root of the two narrow gap welding grooves are respectively located on the left and right sides of the two airfoils of airfoil A 2 and airfoil B 4, and are connected in the middle area of ​​the end face 3 to form an S-shaped blunt edge.

[0034] The thickness a of the blunt edge 5 at the root of the bevel is 4~6mm, the width b is 14~16mm, and it is machined with a rounded corner R, the radius of which is 7~10mm.

[0035] The bevel surface 6 has an inclination of 1~2°, with the lowest inclination point being the opening direction of the bevel. In this embodiment, the blunt edge 5 at the root of the bevel is placed on both sides, allowing the bevel to face both sides, thus expanding the adaptability of welding the fixed guide vane 1.

[0036] Specific Implementation Method Two: Combining Figures 1-4 This embodiment describes a welding method for a narrow gap welding bevel between the ring plate of a pumped-storage turbine base and a fixed guide vane, as described in Embodiment 1, comprising the following steps:

[0037] S1. Two narrow gap welding bevels are machined on the end face 3 of the fixed guide vane 1. The bevels include a bevel face 6 with a certain slope and a bevel root blunt edge 5 with a rounded corner. The angle θ of the bevel face 6 is 1.5°, the thickness a of the bevel root blunt edge 5 is 4mm, the width b is 14mm, and the rounded corner R is 7mm.

[0038] S2. Assemble the fixed guide vane 1 and the ring plate 7 together, as follows: Figure 3 , Figure 4This creates a narrow gap weld 8, forming a T-joint between the narrow gap welding groove and the surface of the ring plate 7.

[0039] S3. Using dual robots to hold narrow gap welding guns 9, welding is performed simultaneously on the A airfoil 2 and B airfoil 4 sides respectively, melting through the bevel root blunt edge 5 of the transition connection in the middle area of ​​end face 3, ensuring welding quality and controlling welding deformation.

[0040] S4. During the welding process, use multi-layer multi-pass offset or laser tracking offset to reduce the manual teaching process and improve welding efficiency until the narrow gap weld 8 is fully welded.

[0041] In this embodiment, a dual-robot clamping narrow-gap welding torch is used to simultaneously weld on both sides of the fixed guide vane, which solves the problem that the spacing between the fixed guide vanes of the pumped storage unit is too small to perform robot narrow-gap welding, and improves the intelligence level of pumped storage seat ring welding.

[0042] It should be noted that in the above embodiments, as long as the technical solutions are not contradictory, they can be permuted and combined. Those skilled in the art can exhaust all possibilities based on the mathematical knowledge of permutation and combination. Therefore, the present invention will not describe the technical solutions after permutation and combination one by one, but it should be understood that the technical solutions after permutation and combination have been disclosed by the present invention.

[0043] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A narrow gap welding bevel between the ring plate of a pumped-storage turbine base and a fixed guide vane, comprising a fixed guide vane (1), wherein the upper and lower sides of the fixed guide vane (1) are configured as end faces (3), and the left and right sides of the fixed guide vane (1) are respectively configured as an A-airfoil (2) and a B-airfoil (4), characterized in that: Two narrow gap welding grooves are machined on the end face (3). The opening directions of the narrow gap welding grooves are set opposite to each other. A groove surface (6) is provided at the bottom of the narrow gap welding groove. A groove root blunt edge (5) is provided on the side opposite to the opening of the groove surface (6).

2. The narrow gap welding bevel between the pumped-storage turbine base ring plate and the fixed guide vane as described in claim 1, characterized in that: The curvature of airfoil A (2) is greater than that of airfoil B (4).

3. The narrow gap welding bevel between the pumped-storage turbine base ring plate and the fixed guide vane as described in claim 1, characterized in that: The maximum distance between airfoil A (2) and airfoil B (4) is 150 mm, and the minimum distance between airfoil A (2) and airfoil B (4) is 0 mm.

4. The narrow gap welding bevel between the pumped-storage turbine base ring plate and the fixed guide vane as described in claim 1, characterized in that: The two end faces (3) on the upper and lower sides of the fixed guide vane (1) are parallel to each other and the maximum distance between them is 350mm.

5. The narrow gap welding bevel between the pumped-storage turbine base ring plate and the fixed guide vane as described in claim 1, characterized in that: The bevel root blunt edges (5) of the two narrow gap welding bevels are respectively placed on the left and right sides of the two airfoils of the A airfoil (2) and the B airfoil (4), and are connected in the middle area of ​​the end face (3) to form an S-shaped bevel blunt edge.

6. The narrow gap welding bevel between the ring plate of a pumped-storage turbine base and the fixed guide vane as described in claim 1, characterized in that: The thickness a of the blunt edge (5) at the root of the bevel is 4~6mm, the width b is 14~16mm, and it is machined with a rounded corner R, the radius of which is 7~10mm.

7. The narrow gap welding bevel between the pumped-storage turbine base ring plate and the fixed guide vane as described in claim 1, characterized in that: The slope of the bevel surface (6) is 1~2°.

8. A welding method for a narrow gap welding bevel between the ring plate of a pumped-storage turbine base and a fixed guide vane as described in claim 1, characterized in that, Includes the following steps: S1. Two narrow gap welding bevels are machined on the end face (3) of the fixed guide vane (1); S2. Assemble the fixed guide vane (1) and the ring plate (7) together to form a narrow gap weld (8) with a T-joint between the narrow gap welding groove and the surface of the ring plate (7). S3. Using dual robots to hold narrow gap welding guns (9), welding is performed simultaneously on the A airfoil (2) and B airfoil (4) sides respectively, and the root blunt edge (5) of the bevel connected in the middle area of ​​the end face (3) is melted through to ensure welding quality and control welding deformation. S4. During the welding process, use multi-layer multi-pass offset or laser tracking offset to weld until the narrow gap weld (8) is fully welded.

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