Welding device and welding method for saddle-shaped welding seam of connecting pipe and barrel

Abstract

The invention discloses a welding device and a welding method for a saddle-shaped welding seam of a connecting pipe and a barrel, and the welding device for the saddle-shaped welding seam of the connecting pipe and the barrel comprises a welding machine base, a welding rod, a welding rod and a driving device, the rotating mechanism is arranged on the welding machine base, and the rotating center shaft of the rotating mechanism is coaxial with the center line of the connecting pipe; the controller is arranged on the rotating mechanism; the cross beams are arranged on the two sides of the controller; the welding parts are symmetrically arranged on the cross beam by taking the center line of the connecting pipe as the axis; and the controller adjusts the height between the welding part and the saddle-shaped welding seam in the welding process according to electric arc voltage feedback during uphill and downhill welding in the welding process. By means of the method, whole-circle symmetrical welding on the saddle type welding seam can be achieved, the width of the welding seam can be reduced to 18 mm or less, the welding seam deposited metal filling amount is greatly reduced, welding deformation is reduced, and the welding quality is improved.

Description

Technical Field

[0001] The invention relates to a welding device, in particular to a welding device and a welding method for a saddle-shaped weld between a pipe and a cylinder. Background Art

[0002] There are multiple saddle-type welds between pipes and cylinders of different sizes and wall thicknesses in pressure vessels, steam generators and other equipment in pressurized water reactor nuclear power and fourth-generation nuclear power, such as the main feed water nozzle and upper cylinder, manhole pipe seat and upper cylinder in the AP1000 third-generation pressurized water reactor steam generator, inlet and outlet pipes and pipe section cylinder in the pressure vessel, hot gas duct and cylinder welding, and main steam nozzle and cylinder saddle-type weld in the fourth-generation nuclear power high-temperature gas-cooled reactor pressure vessel or steam generator.

[0003] The saddle-shaped welds between the conventional pressurized water reactor nuclear power pipes and the cylinder are welded by mechanical submerged arc welding. The weld width is generally controlled at 33 to 40 mm, and the saddle height is generally within 150 mm, which is less than the cylinder wall thickness. In the fourth-generation nuclear power plant, the saddle height between some containers and pipes is nearly 400 mm, which is much larger than the cylinder wall thickness of 200 mm. Submerged arc welding can only be performed flat welding, and climbing or downhill welding is not possible. When the height difference is less than the wall thickness, the submerged arc welding process can perform full-circle welding within a certain thickness. When the saddle height difference is large, there will be obvious ups and downslope welding, and flat welding can only be performed in sections. At this time, not only will multiple arc starting and ending joints be added, but also the grinding of the arc starting and ending points during the welding process and the positioning before each weld will be increased. The workload increases dramatically and weld defects are easily generated. Summary of the invention

[0004] The purpose of the present invention is to provide a welding device and a welding method for the saddle-shaped weld between the connecting pipe and the cylinder, which can not only realize the symmetrical welding of the whole circle on the saddle-shaped weld, but also reduce the weld width to 18mm or less, greatly reduce the amount of weld deposited metal filling, reduce welding deformation, and improve welding quality.

[0005] In order to achieve the above objectives, the present invention is implemented by the following technical solutions:

[0006] A welding device for a saddle-shaped weld between a pipe and a cylinder, characterized by comprising:

[0007] A welding machine base, which is fixed on the pipe;

[0008] A rotating mechanism is arranged on the welding machine base, and its rotating center axis is coaxial with the center line of the connecting pipe;

[0009] A controller, which is arranged on the rotating mechanism;

[0010] A crossbeam, which is arranged on both sides of the controller;

[0011] A pair of welding parts are symmetrically arranged on the crossbeam with the center line of the pipe as the axis;

[0012] The controller controls the lifting and lowering of the crossbeam according to the arc voltage feedback during uphill and downhill welding during the welding process, thereby adjusting the height between the welding part and the saddle-shaped weld during the welding process.

[0013] Furthermore, each of the welding parts comprises:

[0014] A welding gun support, which is vertically arranged on the crossbeam;

[0015] The welding gun is arranged at the end of the welding gun bracket and is aimed at the saddle-shaped weld.

[0016] Furthermore, the welding device further comprises:

[0017] A wire feeding guide tube having a wire feeding passage;

[0018] The wire feeding mechanism is connected with the wire feeding guide tube and is used to transmit the welding wire and send the welding wire to the welding gun position along the wire feeding channel.

[0019] Furthermore, a pair of welding parts are arranged across two sides of the pipe and symmetrically weld saddle-shaped welds.

[0020] Furthermore, a pair of welding parts start welding synchronously at the saddle-shaped weld, and the welding device rotates one circle around the center line of the pipe to complete the full circle welding of the saddle-shaped weld.

[0021] A welding method for a saddle-shaped weld between a pipe and a cylinder, characterized in that the welding method uses the above-mentioned welding device and comprises:

[0022] Install welding equipment on the pipe;

[0023] Adjust a pair of welding parts so that the welding gun is aimed at the saddle weld;

[0024] A pair of welding parts start welding synchronously at the saddle-shaped weld, and the welding device rotates one circle around the center line of the pipe to complete the full circle welding of the saddle-shaped weld.

[0025] Furthermore, the welding method further comprises:

[0026] Before starting welding, the welding device rotates one circle to observe whether the welding positions of the two welding guns interfere with the outer wall of the connecting pipe during the rotation process.

[0027] Compared with the prior art, the present invention has the following advantages:

[0028] The present invention can not only realize the symmetrical welding of the whole circle on the saddle-shaped weld, but also reduce the weld width to 18 mm or less, greatly reduce the weld deposited metal filling amount, reduce welding deformation, and improve welding quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 The present invention is a structural diagram of a welding device for a saddle-shaped weld between a connecting pipe and a cylinder.

[0030] Figure 2 It is a structural schematic diagram of the saddle-shaped weld of the present invention;

[0031] Figure 3 It is a schematic structural diagram of the cylinder of the present invention. DETAILED DESCRIPTION

[0032] The present invention will be further described below by describing a preferred specific embodiment in detail in conjunction with the accompanying drawings.

[0033] like Figure 1-3 As shown, a welding device is used for welding a saddle-shaped weld 3 between a pipe 1 and a cylinder 2, comprising: a welding machine base 4, which is fixed on the pipe 1 and is used to bear the total weight of the entire welding device; a rotating mechanism 5, which is arranged on the welding machine base 4, and its rotating center axis is coaxial with the center line of the pipe 1; a controller 6, which is arranged on the rotating mechanism 5; a crossbeam 7, which is arranged on both sides of the controller 6; a pair of welding parts, which are symmetrical with the center line of the pipe 1 as an axis, are arranged on the crossbeam 7; the controller 6 is connected to the actuator for lifting the crossbeam, and the controller 6 controls the lifting of the crossbeam according to the arc voltage feedback during the uphill and downhill welding during the welding process, thereby adjusting the height between the welding part and the saddle-shaped weld 3 during the welding process. The controller is provided with an arc voltage tracking control system, which refers to using arc voltage as a sensor signal to monitor the voltage during welding in real time. Through the automatic control of the arc height, there is no need to manually adjust the up and down height of the welding gun, which is automatically completed by the arc voltage tracking system.

[0034] Each welding part includes: a welding gun bracket 81, which is vertically arranged on the crossbeam 7; a welding gun 82, which is arranged at the end of the welding gun bracket 81 and is aimed at the saddle weld 3. In a specific embodiment, the welding gun 82 is a tungsten inert gas arc welding gun, including a camera, a welding wire nozzle, a tungsten electrode and a shielding gas pipeline. The welding gun is a prior art and is not described here. The arc pressure tracking system refers to using the arc pressure as a sensor signal to make the crossbeam rise and fall, thereby adjusting the height between the welding gun and the saddle weld 3.

[0035] The welding device further includes: a wire feeding duct 91, which is provided with a wire feeding channel; a wire feeding mechanism 92, which is connected with the wire feeding duct 91 and is used to transmit the welding wire and send the welding wire to the welding gun 82 along the wire feeding channel; a pair of welding parts are arranged across the two sides of the pipe 1, and the saddle-shaped weld 3 is welded symmetrically, and a pair of welding parts are synchronously welded at the saddle-shaped weld 3, and the welding device rotates around the center line of the pipe for one circle to complete the full circle welding of the saddle-shaped weld 3. Specifically, the welding gun 82 of the welding part is arranged across the two sides of the pipe 1, and the saddle-shaped weld 3 is welded symmetrically.

[0036] The present application also discloses a welding method using the above-mentioned welding device, which includes: installing the welding device on the pipe; adjusting a pair of welding parts so that the welding gun 82 is aimed at the saddle-shaped weld 3; a pair of welding parts synchronously start welding at the saddle-shaped weld 3 (the arc can be started at the lowest point or the highest point of the saddle-shaped weld), and the welding device rotates one circle around the center line of the pipe to complete the full circle welding of the saddle-shaped weld.

[0037] The welding method further includes: before welding the welding part, the welding device rotates one circle to observe whether the welding positions of the two welding guns interfere with the outer wall of the pipe during the rotation process. In addition, during the whole circle synchronous welding process, the molten pool is observed through the built-in camera system of the welding gun, and if there is any abnormality, it is stopped in time.

[0038] In summary, the welding device and welding method for the saddle-shaped weld between the connecting pipe and the cylinder of the present invention can not only realize the symmetrical welding of the entire circle on the saddle-shaped weld, but also reduce the weld width to 18 mm or less, greatly reducing the amount of weld deposited metal filling, reducing welding deformation, and improving welding quality.

[0039] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0040] In the description of the present invention, it should be understood that the terms "center", "height", "thickness", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the 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 element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0041] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0043] In addition, the functional modules in the various embodiments of this document may be integrated together to form an independent part, or each module may exist independently, or two or more modules may be integrated to form an independent part.

[0044] Although the content of the present invention has been described in detail through the above preferred embodiments, it should be appreciated that the above description should not be considered as a limitation of the present invention. After reading the above content, it will be apparent to those skilled in the art that various modifications and substitutions of the present invention will occur. Therefore, the protection scope of the present invention should be limited by the appended claims.

Claims

1. A welding device for saddle-shaped welds between a pipe and a cylinder, characterized in that: include: A welding machine base, which is fixed on the pipe; A rotating mechanism is arranged on the welding machine base, and its rotating center axis is coaxial with the center line of the connecting pipe; A controller, which is arranged on the rotating mechanism; A crossbeam, which is arranged on both sides of the controller; A pair of welding parts are symmetrically arranged on the crossbeam with the center line of the pipe as the axis; The controller controls the lifting and lowering of the crossbeam according to the arc voltage feedback during uphill and downhill welding during the welding process, thereby adjusting the height between the welding part and the saddle-shaped weld during the welding process.

2. The welding device for the saddle-shaped weld between the pipe and the cylinder according to claim 1, characterized in that: Each of the welding parts comprises: A welding gun support, which is vertically arranged on the crossbeam; The welding gun is arranged at the end of the welding gun bracket and is aimed at the saddle-shaped weld.

3. The welding device for the saddle-shaped weld between the pipe and the cylinder as claimed in claim 2, characterized in that: The welding device further comprises: A wire feeding guide tube having a wire feeding passage; The wire feeding mechanism is connected with the wire feeding guide tube and is used to transmit the welding wire and send the welding wire to the welding gun position along the wire feeding channel.

4. The welding device for saddle-shaped welds between a pipe and a cylinder as claimed in claim 1, characterized in that: A pair of welding parts are arranged across two sides of the pipe and symmetrically welded to form saddle-shaped welds.

5. The welding device for saddle-shaped welds between a pipe and a cylinder as claimed in claim 1, characterized in that: A pair of welding parts start welding synchronously at the saddle-shaped weld, and the welding device rotates one circle around the center line of the pipe to complete the full circle welding of the saddle-shaped weld.

6. A welding method for a saddle-shaped weld between a pipe and a cylinder, characterized in that: The welding method uses the welding device as described in any one of claims 1 to 5, and comprises: Install welding equipment on the pipe; Adjust a pair of welding parts so that the welding gun is aimed at the saddle weld; A pair of welding parts start welding synchronously at the saddle-shaped weld, and the welding device rotates one circle around the center line of the pipe to complete the full circle welding of the saddle-shaped weld.

7. The welding method for the saddle-shaped weld between the pipe and the cylinder as claimed in claim 6, characterized in that: The welding method further comprises: Before starting welding, the welding device rotates one circle to observe whether the welding positions of the two welding guns interfere with the outer wall of the connecting pipe during the rotation process.

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