Welding device and method for a fan-shaped lug of a gas turbine

Abstract

The present invention belongs to the technical field of gas turbine manufacturing, and discloses a welding device and method for a fan-shaped ear seat of a gas turbine, which has high welding precision, small welding deformation, convenient operation, good welding identity, and high first-pass rate of welding; it includes a base, a first support, a second support and a welding steady flow unit connected to an external welding device; the base is located at the bottom of the welding device, and a pressing plate assembly for fixing the gas turbine bearing is arranged in the middle of the base; a first support bayonet corresponding to the axial position and quantity of the fan-shaped ear seat of the gas turbine bearing is arranged on the base; the first support is vertically arranged on the base, one end is detachably connected to the first support bayonet, and a first clamping member for clamping the first flat-layer ear seat of the gas turbine bearing is fixedly arranged on the inner side of the top of the first support; the second support is fixedly arranged at the other end of the first support, and a second clamping member for clamping the second flat-layer ear seat of the gas turbine bearing is fixedly arranged on the top of the second support.

Description

Technical Field

[0001] The present invention belongs to the technical field of gas turbine manufacturing, and particularly relates to a welding device and method for a fan-shaped ear seat of a gas turbine. Background Art

[0002] For a power turbine bearing housing of a certain gas turbine, two groups of cantilever fan-shaped ear seats are welded at the middle part of the outer wall of the casing, near the small end, with 9 at each group. The welding thickness of the front ear seat is 26 mm, and the welding thickness of the rear ear seat is 6 mm. After welding, 100% radiographic inspection of the weld seam is required.

[0003] The materials of the fan-shaped ear seat and the bearing housing casing are both 1Cr12Ni3MoVN martensitic stainless steel. This material has high strength and a large hardening tendency, and is prone to cold cracks, so manual argon arc welding is used for welding. In the structural design of the casing, the front and rear ear seats are welded on the flange of the outer wall of the bearing housing casing. Except for the weld seam, there is no other rigid connection between the ear seat and the casing in the axial and radial directions. Due to the special nature of the casing structure, the assembly deviation and welding deformation of the two groups of ear seats need to be controlled within 5 mm to meet the subsequent processing requirements. When welding, the method of backing welding on the front side and root cleaning on the back side is adopted. The heat input in the welding area is relatively large, and when welding on the front and back sides, the welding deformation is not easy to control, resulting in the front and rear ear seats deforming in different directions after welding. The 9 fan-shaped segments on the same circumference are distributed in a wavy shape on the circumferential surface, and the post-welding shape correction is difficult, seriously affecting the processing quality of the bearing housing. During backing welding, the oxidation on the back side of the weld seam is serious, and it is necessary to grind and clean the root to completely remove the oxidation defects of the weld seam before welding, which not only increases the welding heat input and aggravates the welding deformation, but also affects the first-pass rate of 100% radiographic inspection of the weld seam at this place. Summary of the Invention

[0004] In order to solve the problems in the prior art, the present invention provides a welding device and method for a fan-shaped ear seat of a gas turbine, which have high welding precision, small welding deformation, are easy to operate, have good welding consistency, and a high first-pass rate of welding.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] A welding device for a fan-shaped ear seat of a gas turbine bearing includes a base, a first support, a second support, and a welding current stabilizing unit connected to an external welding device;

[0007] The base is located at the bottom of the welding device. A pressing plate assembly for fixing the gas turbine bearing is provided in the middle of the base; a first support bayonet corresponding to the axial position and number of the fan-shaped ear seats of the gas turbine bearing is provided on the base;

[0008] The first support is vertically arranged on the base, one end is detachably connected to the first support bayonet, and a first clamping member for clamping the first flat-layer ear seat of the gas turbine bearing is fixedly arranged on the inner side of the top of the first support;

[0009] The second support is fixedly arranged on the first support, and a second clamping member for clamping the second flat-layer ear seat of the gas turbine bearing is fixedly arranged on the top of the second support;

[0010] When the welding steady flow unit is in use, one end is connected to an external welding unit, and the other end is attached to the lower part of the sector ear seat of the gas turbine bearing.

[0011] Further, the height of the first support is the same as the height of the first flat-layer ear seat on the gas turbine bearing.

[0012] Further, the height of the second support is the same as the height of the second flat-layer ear seat on the gas turbine bearing.

[0013] Further, the pressing plate assembly includes a pressing plate and bolts;

[0014] Through holes are provided on the pressing plate;

[0015] The bolts pass through the through holes and are threadedly connected to the base.

[0016] Further, both the first clamping member and the second clamping member include a clamping table, a positioning pin and a pressing plate;

[0017] One side of the clamping table is fixedly connected to the first support, and the other side is a free end. A positioning table is provided on one side of the clamping table;

[0018] The positioning pin is fixedly arranged on the clamping table;

[0019] The pressing plate is located on one side of the clamping table, and the pressing plate is threadedly connected to the clamping table through a screw rod.

[0020] Further, the number of the positioning pins is two, and the two positioning pins are spaced apart on the clamping table.

[0021] Further, the welding steady flow unit is a box structure with one side open. Arc-shaped notches corresponding to the arc of the sector ear seat are provided on two side surfaces of the opening of the box structure. A partition parallel to the bottom surface of the box is provided inside the box structure. A number of uniformly distributed through holes are provided on the partition. An air vent is opened at the bottom of the rectangular box.

[0022] A method for using a welding device for a fan-shaped ear seat of a gas turbine bearing, including fixedly arranging a gas turbine bearing on a base and fixing the gas turbine bearing through a pressing plate assembly. A first support is arranged on the first support bayonet of the base, a second support is fixedly connected to the first support, and a first clamping member for clamping the first flat-layer ear seat of the gas turbine bearing and a second clamping member for clamping the second flat-layer ear seat of the gas turbine bearing are respectively arranged on the first support. Through the clamping of the first clamping member and the second clamping member on the fan-shaped ear seat, the positioning and fixing during the welding of the fan-shaped ear seat are completed. During welding, the welding current stabilizing unit is connected to an external welding unit, and the welding current stabilizing unit is attached to the lower part of the fan-shaped ear seat of the gas turbine bearing to complete the welding of the fan-shaped ear seat.

[0023] Further, after the fan-shaped ear seat is clamped, a preset distance of 3 mm is provided between the welding end of the fan-shaped ear seat and the circumference of the gas turbine bearing.

[0024] Further, when the fan-shaped ear seat is clamped on the first clamping member and the second clamping member, a preset distance of 2.5 mm is provided between the bottom surface of the fan-shaped ear seat and the bottom surfaces of the first ear seat and the second ear seat.

[0025] Compared with the prior art, the advantages of the present invention are as follows:

[0026] The welding device for the fan-shaped ear seat of the gas turbine of the present invention fixes the gas turbine bearing on the base through a pressing plate assembly, and sets a first support bayonet corresponding to the axial position and quantity of the fan-shaped ear seat of the gas turbine bearing on the base. A first support is arranged on the first support bayonet, a second support is arranged on the first support, and a structure of a first clamping member and a second clamping member is respectively arranged inside the first support and the second support. When the fan-shaped ear seat is welded, the positioning of the welded fan-shaped ear seat can be achieved through the first clamping member and the second clamping member on the first support and the second support, avoiding the alignment before welding. At the same time, the welded fan-shaped ear seat can be clamped through the first clamping member and the second clamping member, ensuring that the height of the welded fan-shaped ear seat from the base is the same, and the distance between the welded fan-shaped ear seat and the circumferential surface of the gas turbine bearing is certain, thereby ensuring the identity among multiple welded fan-shaped ear seats. Through the clamping of the clamping member, it can be ensured that the fan-shaped ear seat does not shake during welding, reducing the welding deformation caused by the shaking of the fan-shaped ear seat during the welding process, which leads to low welding accuracy. At the same time, through the structure of the welding current stabilizing unit connected to the external welding device, when the external welding unit introduces inert gas for welding, the welding current stabilizing unit can disperse the input inert gas required for welding, avoiding the problems of insecure welding materials at the welding position or gaps between welds caused by too strong and concentrated input gas, resulting in low first-pass rate of welds.

[0027] Further, by setting the height of the first support to be the same as the height of the first flat-layer ear seat on the gas turbine bearing, and the height of the second support to be the same as the height of the second flat-layer ear seat on the gas turbine bearing, the height of each sector ear seat to be welded is made consistent on the first flat layer and the second flat layer of the gas turbine bearing, further ensuring the identity of welding and reducing the height deviation and position deviation during welding.

[0028] Further, through the structure of the pressing plate assembly of the pressing plate and the bolt, the gas turbine bearing can be quickly fixed and removed through the pressing plate and the bolt, improving the efficiency of fixing the gas turbine bearing during welding.

[0029] Further, by setting a clamping table on the first clamping part and the second clamping part, and setting a positioning table on the clamping table, the sector ear seat to be welded can be radially positioned through the positioning table. By setting a positioning pin on the clamping table, the axial positioning of the sector ear seat can be achieved through the positioning pin, avoiding the movement of the sector ear seat in the axial and radial directions during the welding process, ensuring the identity of the welding positions and heights of the multiple sector ear seats to be welded, and further ensuring the welding accuracy.

[0030] Further, by the structure of arranging two positioning pins at intervals on the clamping table, the positioning pin and the positioning table on the clamping table completely position the sector ear seat to be welded, further avoiding the problem that the welding deformation amount increases due to the shaking of the sector ear seat, resulting in the reduction of welding accuracy.

[0031] Further, by setting an arc-shaped notch on the welding flow stabilizing unit, the welding flow stabilizing unit can better fit under the sector ear seat; by arranging a partition inside the welding flow stabilizing unit, and evenly arranging a number of through holes on the partition, and setting a ventilation port at the bottom of the welding flow stabilizing unit, the inert gas required during welding can be shunted, so that the inert gas entering the welding flow stabilizing device from the ventilation port is evenly distributed around the sector ear seat, avoiding the problem that the input gas is too concentrated, resulting in gaps between the welding materials or uneven accumulation of the welding materials due to excessive inert gas pressure, causing insecure welding and low first-pass rate of the weld seam.

[0032] Further, during welding, by setting a preset distance of 3 mm between the welding end of the sector ear seat and the circumference of the gas turbine bearing, and setting a preset distance of 2.5 mm between the bottom surface of the sector ear seat and the bottom surfaces of the first ear seat and the second ear seat, the welding materials can fully contact the outer circumferential surfaces of the sector ear seat and the gas turbine bearing, further ensuring the welding effect. Description of the Drawings

[0033] The accompanying drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an improper limitation to the present invention.

[0034] In the drawings:

[0035] Figure 1 is a schematic diagram of the overall structure of a welding device for a sector ear seat of a gas turbine bearing according to the present invention;

[0036] Figure 2 is a schematic diagram of the structure of the base of a welding device for a sector ear seat of a gas turbine bearing according to the present invention;

[0037] Figure 3 is a partial structural schematic diagram of the first clamping assembly or the second clamping assembly of a welding device for a sector ear seat of a gas turbine bearing according to the present invention cooperating with the sector ear seat;

[0038] Figure 4 is a partial sectional structural schematic diagram when the outer circumferential surface of a gas turbine bearing and a sector ear seat are welded by a welding device for a sector ear seat of a gas turbine bearing according to the present invention;

[0039] Figure 5 is a partial sectional structural schematic diagram after the outer circumferential surface of a gas turbine bearing and a sector ear seat are welded by a welding device for a sector ear seat of a gas turbine bearing according to the present invention;

[0040] Figure 6 is a schematic diagram of the structure of a welding steady flow unit of a welding device for a sector ear seat of a gas turbine bearing according to the present invention.

[0041] Wherein: base 1, first support 2, second support 3, welding steady flow unit 4, first support bayonet 5, gas turbine bearing 6, sector ear seat 7, first pressing plate 8, bolt 9, clamping table 10, positioning table 11, positioning pin 12, second pressing plate 13, partition 14, ventilation port 15, screw 16, arc notch 17, first clamping member 18, second clamping member 19. Detailed implementation manners

[0042] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that, without conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0043] The following detailed descriptions are all exemplary descriptions, aiming to provide a further detailed description of the present invention. Unless otherwise specified, all technical terms adopted by the present invention have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs. The terms used in the present invention are only for describing specific implementation manners and are not intended to limit the exemplary embodiments according to the present invention.

[0044] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation 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 thus should not be construed as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise stated, the meaning of "a plurality" is two or more. In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "mounted", "connected" and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. 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.

[0045] Embodiment 1

[0046] A welding device for a fan-shaped ear seat of a gas turbine bearing, as Figure 1 and Figure 2 shown, includes a base 1, a first support 2, a second support 3 and a welding steady flow unit 4 connected to an external welding device; the base 1 is located at the bottom of the welding device, and a pressing plate assembly for fixing the gas turbine bearing 6 is arranged in the middle of the base 1; a first support bayonet 5 corresponding to the axial position and quantity of the fan-shaped ear seats 7 on the gas turbine bearing 6 is arranged on the base 1; the first support 2 is vertically arranged on the base 1, one end is detachably connected to the first support bayonet 5, and a first clamping member for clamping the first flat-layer fan-shaped ear seat 7 of the gas turbine bearing 6 is fixedly arranged on the inner side of the top of the first support 2; the second support 3 is fixedly arranged at the other end of the first support 2, and a second clamping member for clamping the second flat-layer fan-shaped ear seat 7 of the gas turbine bearing 6 is fixedly arranged on the top of the second support 3; when the welding steady flow unit 4 is in use, one end is connected to an external welding unit, and the other end is attached to the lower part of the fan-shaped ear seat 7 in the gas turbine bearing 6.

[0047] Specifically, the first support and the second support are rectangular columnar structures, and hollow structures are provided on the side walls and the centers of the rectangular columnar structures. The first support bayonet is a rectangular notch corresponding to the rectangular columnar structure. A boss for threaded connection is provided at the bottoms of the first support and the second support, and the first support and the base, and the second support and the first support are fixed by bolts, nuts and gaskets.

[0048] Preferably, the base 1 is a disc-shaped structure, a circular boss matching the inner ring at the bottom of the gas turbine bearing 6 is provided in the middle of the disc-shaped structure, and a first positioning hole is provided at the bottom of the gas turbine bearing 6. A second positioning hole corresponding to the bottom positioning hole of the gas turbine bearing 6 is provided on the base 1. When the gas turbine bearing 6 is pressed onto the base 1 through a pressing assembly, first, a positioning pin 12 is arranged in the second positioning hole on the base 1, and the first positioning hole of the gas turbine bearing 6 is inserted into the positioning pin 12 in the second positioning hole to realize the fixation and positioning of the gas turbine bearing 6 on the base 1. Optionally, the base 1 includes but is not limited to a disc-shaped structure, and can also be set as a rectangular, polygonal or elliptical structure, or a structure of the shape of the base 1 of the present invention is provided on a base with a rectangular, polygonal or elliptical shape, which all fall within the protection scope of the present invention.

[0049] Specifically, the number of sector lugs 7 to be welded on the gas turbine bearing 6 in the preferred embodiment of the present invention is 9, and the sizes and structures of the 9 sector lugs 7 are the same. The 9 sector lugs 7 are evenly distributed on the first flat layer and the second flat layer of the gas turbine bearing 6. The number of the first support bays 5 on the base 1 is correspondingly set to 9, and the positions of the 9 first support bays 5 are exactly the same as the distribution angles and distribution positions of the 9 sector lugs 7 on the gas turbine bearing 6 on the axis, corresponding one by one. Preferably, the number of the first supports 2 and the second supports 3 of the present invention is three. After the three first supports 2 and the second supports 3 are assembled as a whole, they are evenly fixed on the base 1 at intervals. When welding, the whole formed by the three first supports 2 and the second supports 3 is used as a group. First, the sector lugs 7 corresponding to the positions of the three first supports 2 and the second supports 3 on the first flat layer and the second flat layer of the gas turbine bearing 6 are welded. After the three sector lugs 7 on the corresponding first flat layer and the second flat layer are welded respectively, the three first supports 2 connected to the base 1 are disassembled, and the fixed connection between the second support 3 and the first support 2 is maintained, and they are correspondingly shifted to the remaining first support bays 5 where the sector lugs 7 have not been welded and fixed; preferably, the three first supports 2 are respectively arranged on adjacent first support bays 5 to weld the remaining sector lugs 7. With such a setting, on the one hand, the number of the first supports 2 and the second supports 3 is reduced, the weight of the overall welding device is reduced, and the structure of the overall welding device is made more portable. On the other hand, the disassembly and assembly efficiency is improved, there is enough welding space for operators to weld, and the welding efficiency is improved.

[0050] Specifically, the height of the first support 2 is the same as the height of the first flat-layer sector lug 7 on the gas turbine bearing 6. Specifically, the height of the second support 3 is the same as the height of the second flat-layer sector lug 7 on the gas turbine bearing 6.

[0051] Specifically, the pressing plate assembly includes a first pressing plate 8 and a bolt 9; through holes are provided on the first pressing plate 8; the bolt 9 passes through the through hole and is threadedly connected to the base 1. Preferably, the number of the pressing plate assemblies is 9, and the 9 pressing plates are respectively arranged in the same direction on 9 first support bayonets on the base.

[0052] Specifically, as Figure 3 shown, both the first clamping member and the second clamping member include a clamping table 10, a positioning pin 12 and a second pressing plate 13; one side of the clamping table 10 is fixedly connected to the first support 2, and the other side is a free end, and a positioning table 11 is arranged on one side of the clamping table 10; the positioning pin 12 is fixedly arranged on the clamping table 10; the second pressing plate 13 is located on one side of the clamping table 10, and the second pressing plate 13 is threadedly connected to the clamping table 10 through a screw rod 16.

[0053] Preferably, the number of the positioning pins 12 is two, and the two positioning pins 12 are spaced apart on the clamping table 10.

[0054] Specifically, when clamping the sector lug 7, taking one sector lug 7 as an example, the positioning and fixing of the sector lug 7 on the clamping table 10 are described; when positioning and fixing, first place the sector lug 7 to be welded on the clamping table 10, and make one side of the sector lug 7 to be welded contact the positioning table 11 on the clamping table 10; and make the outer edge of the sector lug 7 to be welded contact the positioning pin 12. With such a setting, the two positioning pins 12 and one positioning table 11 on the clamping table 10 can three-point position the sector lug 7 to be welded, so that the sector lug 7 to be welded can realize the radial positioning of the sector lug 7 through the positioning table 11, and through the structure of arranging the positioning pins 12 on the clamping table 10, the axial positioning of the sector lug 7 can be realized through the positioning pins 12, avoiding the movement of the sector lug 7 in the axial and radial directions during the welding process, ensuring the identity of the welding positions and heights of the welded multiple sector lugs 7, and further ensuring the welding precision.

[0055] Specifically, as Figure 6As shown, the welding current stabilizing unit 4 is a box or shell structure with one open side. On two sides of the opening of the box structure, there are arc-shaped notches 17 corresponding to the radian of the sector ear seats 7. Inside the box structure, there is a partition 14 parallel to the bottom surface of the box. On the partition 14, there are several uniformly distributed through holes. At the bottom of the rectangular box, there is a ventilation port 15. Preferably, the welding current stabilizing unit 4 is a shell with a rectangular structure, made of a metal material, preferably stainless steel. Preferably, at one end of the opening of the shell, there are two symmetric baffles. Preferably, the ventilation port 15 is a pipe structure, that is, there are through holes at the bottom of the shell, and a ventilation port 15 with a pipe structure is arranged on the through holes. During welding, one side of the arc-shaped notch 17 of the rectangular box or shell structure is attached to the lower surface of the sector ear seat, so that the inert gas required for welding, preferably argon, can enter the inside of the box structure or shell structure of the welding current stabilizing unit 4 through the ventilation port with a pipe structure, and the inert gas used for welding is output through the partition 14. Specifically, there is a certain distance between the partition 14 and the bottom surface of the welding current stabilizing unit 4. Preferably, the partition is located in the middle of the welding current stabilizing unit 4. Preferably, the partition 14 is a metal plate. Preferably, the size of the partition 14 is the same as the size of the bottom surface of the welding current stabilizing unit 4. Preferably, the partition 14 and the welding current stabilizing unit 4 are fixedly connected by means of threads or welding.

[0056] Embodiment 2

[0057] A method for using a welding device for a sector ear seat of a gas turbine bearing includes fixedly arranging a gas turbine bearing 6 on a base 1 and fixing the gas turbine bearing 6 through a pressing plate assembly. A first support 2 is arranged on the first support bayonet 5 of the base 1. A second support 3 is fixedly connected to the first support 2. A first clamping member for clamping the first flat-layer sector ear seat 7 of the gas turbine bearing 6 and a second clamping member for clamping the second flat-layer sector ear seat 7 of the gas turbine bearing 6 are respectively arranged on the first support 2. Through the clamping of the sector ear seat 7 by the first clamping member and the second clamping member, the positioning and fixing of the sector ear seat 7 during welding are completed. During welding, the welding current stabilizing unit 4 is connected to an external welding unit, and the welding current stabilizing unit 4 is attached to the lower side of the sector ear seat 7 of the gas turbine bearing 6 to complete the welding of the sector ear seat 7.

[0058] Preferably, after the sector ear seat 7 is clamped, a preset distance of 3 mm is set between the welding end of the sector ear seat 7 and the outer circumferential surface of the gas turbine bearing 6. The following table shows the statistical data of the test results between the different distances set between the welding end of the sector ear seat 7 and the outer circumferential surface of the gas turbine bearing 6 and the weld repair rate during the test process.

[0059] Number of tests Butt joint clearance (mm) Average repair rate of weld seam (%) Test 1 1 50％ Test 2 1.5 38％ Test 3 2 26.8％ Test 4 2.5 17.5％ Test 5 3 10％ Test 6 3.5 15％ Test 7 4 27％ Test 8 4.5 30％

[0060] As can be seen from the above table, taking the distance between the welding end of the sector ear seat 7 and the outer circumferential surface of the gas turbine bearing 6 as a single variable, it can be obtained that when the preset distance between the welding end of the sector ear seat 7 and the outer circumferential surface of the gas turbine bearing 6 is set to 3 mm, the repair rate of the weld seam is the lowest, which is 10%. When the preset distance between the welding end of the sector ear seat 7 and the outer circumferential surface of the gas turbine bearing 6 increases or decreases, the repair rate of the weld seam increases. Therefore, it is preferred that the preset distance between the welding end of the sector ear seat 7 and the outer circumferential surface of the gas turbine bearing 6 is 3 mm, so as to reduce the repair rate of the weld seam and improve the first-pass qualification rate of detection.

[0061] Specifically, when the sector ear seat 7 is clamped on the first clamping part and the second clamping part, a preset distance of 2.5 mm is provided between the bottom surface of the sector ear seat 7 and the bottom surfaces of the first clamping part and the second clamping part. As shown in the following table, it is a test data table of the reserved reverse deformation amount between the sector ear seat and the outer circumferential surface of the gas turbine bearing, that is, between the bearing housing, and the height error range of the sector ear seat after welding during the manufacture of the gas turbine bearing.

[0062] Number of tests Reserved reverse deformation amount (mm) Height error range of sector ear seat after welding mm Test 1 1 1.8-2.8 Test 2 1.5 1.1-1.8 Test 3 2 0.7-1.1 Test 4 2.5 0.5-0.7 Test 5 3 0.7-1.2 Test 6 3.5 1.2-2.1 Test 7 4 2.1-3.2 Test 8 4.5 3.2-4 Test 9 0 2-3

[0063] Specifically, taking the test data of the first-piece manufacture of the gas turbine bearing in this preferred embodiment as an example, the relationship between the height error range of the sector ear seat after welding the bearing housing is illustrated. As can be seen from the above table, when no reverse deformation amount is reserved, when detecting the height dimension of the sector ear seat after welding, it is found that the 9 sector ear seats in the first flat layer all deform towards the tooling base, and the deformation directions of the 9 sector ear seats in the second flat layer are different up and down, and the deformation amounts are all between 2 and 3 mm. According to the comprehensive detection and test results, when the reserved reverse deformation amount is 2.5 mm, the height error range of the sector ear seat after welding the bearing housing is 0.5 - 0.7 mm, and the error range is the smallest, which can effectively control the welding deformation of the sector ear seat.

[0064] Specifically, argon arc welding is used between the sector ear seat of the present invention and the gas turbine bearing. There is a groove in argon arc welding. Specifically, in the welding of the present invention, a full penetration symmetrical form is adopted, such as Figure 4 and Figure 5 shown; the welding groove is designed as a double-sided 60° K-type butt groove, and the thickness of the blunt edge of the groove is 1 mm; the assembly gap between the ear seat and the bearing housing is 3 mm.

[0065] During welding, the following steps are included:

[0066] Preparation before welding:

[0067] Before welding, wipe the ear seats, bearing housings, and welding wires with acetone and cotton cloth to ensure that there are no impurities, oil, rust, or other contaminants at the welding joints. Welding operations should be carried out within 30 minutes after cleaning to avoid the risk of weld contamination; check the cylinder certificate, and the purity of argon should reach 99.99%; the pressure of the argon cylinder should not be less than 0.5 MPa, and the argon can be evenly and stably output during welding; grind the end angle of the tungsten electrode to 35° before welding, and control the distance between the tungsten electrode and the part surface to be 1 - 1.5 mm when starting the arc; control the welding site temperature ≥ 20 °C, relative humidity ≤ 60%, and carry out welding in a working environment with appropriate ventilation conditions;

[0068] Clamp the workpiece:

[0069] Each layer of the bearing housing has a total of 9 sector-shaped ear seats. Using a quick-release ear seat positioning support, 3 ear seats can be assembled and welded in each group, and a total of 3 groups are required to complete the welding of all ear seats. When welding the bottom layer of the initial weld, there will be heat input, resulting in deformation of the sector-shaped parts. When clamping the sector-shaped ear seats, a preset welding reverse deformation amount of 2.5 mm is set (as Figure 5 shown), which cancels out with the weld shrinkage amount to achieve the purpose of controlling part deformation.

[0070] TIG welding positioning

[0071] Use manual TIG welding to position the welds, and use a mandrel with a diameter of . There are 10 evenly distributed positioning welds on each sector segment, each weld with a diameter of 5 - 6 mm and a penetration depth of 2 mm; welding current: 200 - 230 (A).

[0072] Use a protection device for backing welding:

[0073] Use manual TIG welding to carry out backing welding on the welds, welding current: 180 - 200 (A); use a back protection device (as Figure 6 shown) and pass argon to protect the back of the weld to avoid oxidation of the back of the weld. A gas flow stabilization structure is set in the back protection device, which is beneficial to the formation of the weld. The parameters of the shielding gas are: pass the shielding gas 0.5 - 1 s in advance before the welding torch starts to arc, and stop the gas 8 - 10 s after the arc is extinguished. The argon flow rate of the welding torch: 10 - 15 (L / min), the argon flow rate of the back protection tooling: 12 - 15 (L / min);

[0074] Multi-layer filling welding on the front and back sides:

[0075] Clean the oxide layer on the back of the backing weld with a wire brush and carry out filling welding with manual TIG welding; welding current 180 - 200 (A), control the interlayer temperature at 150 - 200 degrees Celsius; adopt the method of filling on the front and back sides in turn, with a filling thickness of 3 - 4 mm for each layer, and a total of 6 - 7 layers are filled;

[0076] Final forming capping weld:

[0077] When the thickness of the weld filling is 1 - 2 mm lower than that of the part substrate, manual argon arc welding is used for capping welding; the welding current is 160 - 180 (A), the welding torch makes a Z-shaped swing, the swing frequency is fast, the wire is fed evenly and in small amounts to avoid undercutting and ensure beautiful weld formation.

[0078] As is known by common technical knowledge, the present invention can be implemented by other embodiments that do not depart from its spirit or essential features. Therefore, the above-disclosed embodiments are illustrative in all aspects and not exclusive. All changes within the scope of the present invention or equivalent to the present invention are encompassed by the present invention.

[0079] 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 it. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications or equivalent substitutions can still be made to the specific embodiments of the present invention, and any modification or equivalent substitution that does not depart from the spirit and scope of the present invention should be covered within the protection scope of the claims of the present invention.

Claims

1. A welding device for a fan-shaped ear seat of a gas turbine bearing, characterized in that, It includes a base (1), a first support (2), a second support (3), and a welding current stabilizing unit (4) connected to an external welding device; The base (1) is located at the bottom of the welding device. A pressing plate assembly for fixing the gas turbine bearing (6) is provided in the middle of the base (1); a first support bayonet (5) corresponding to the axial position and quantity of the sector lugs (7) on the gas turbine bearing (6) is provided on the base (1); The first support (2) is vertically arranged on the base (1), one end is detachably connected to the first support bayonet (5), and a first clamping member (18) for clamping the first flat-layer sector lug (7) of the gas turbine bearing (6) is fixedly provided inside the top of the first support (2); The second support (3) is fixedly provided at the other end of the first support (2), and a second clamping member (19) for clamping the second flat-layer sector lug (7) of the gas turbine bearing (6) is fixedly provided on the top of the second support (3); When in use, one end of the welding current stabilizing unit (4) is connected to an external welding unit, and the other end is attached to the lower side of the sector lug (7) in the gas turbine bearing (6); The height of the first support (2) is the same as the height of the first flat-layer sector lug (7) on the gas turbine bearing (6); The height of the second support (3) is the same as the height of the second flat-layer sector lug (7) on the gas turbine bearing (6); Both the first clamping member (18) and the second clamping member (19) include a clamping table (10), a positioning pin (12), and a second pressing plate (13); One side of the clamping table (10) is fixedly connected to the first support (2), and the other side is a free end. A positioning table (11) is provided on one side of the clamping table (10); The positioning pin (12) is fixedly provided on the clamping table (10); The second pressing plate (13) is located on one side of the clamping table (10), and the second pressing plate (13) is threadedly connected to the clamping table (10) through a screw (16).

2. The welding device for a sector lug of a gas turbine bearing according to claim 1, characterized in that, The pressing plate assembly includes a first pressing plate (8) and a bolt (9); A through hole is provided on the first pressing plate (8); The bolt (9) passes through the through hole and is threadedly connected to the base (1).

3. The welding device for a sector lug of a gas turbine bearing according to claim 1, characterized in that, The number of the positioning pins (12) is two, and the two positioning pins (12) are spaced apart on the clamping table (10).

4. The welding device for a fan-shaped ear seat of a gas turbine bearing according to claim 1, characterized in that, The welding current stabilizing unit (4) is a box structure with one side open. Arc-shaped notches (17) corresponding to the radian of the sector lug (7) are provided on two sides of the opening of the box structure. A partition (14) parallel to the bottom surface of the box is provided inside the box structure. A number of uniformly distributed through holes are provided on the partition (14), and an air vent (15) is provided at the bottom of the rectangular box.

5. A method for using a welding device for a gas turbine bearing sector lug as described in claim 1, characterized in that, It includes fixedly arranging a gas turbine bearing (6) on a base (1) and fixing the gas turbine bearing (6) through a pressing plate assembly. A first support (2) is arranged on a first support bayonet (5) of the base (1). A second support (3) is fixedly connected to the first support (2). A first clamping member (18) for clamping a first flat-layer sector ear seat (7) of the gas turbine bearing (6) and a second clamping member (19) for clamping a second flat-layer sector ear seat (7) of the gas turbine bearing (6) are respectively arranged on the first support (2). Through the clamping of the first clamping member (18) and the second clamping member (19) on the sector ear seat (7), the positioning and fixing of the sector ear seat (7) during welding are completed. During welding, a welding current stabilizing unit (4) is connected to an external welding unit, and the welding current stabilizing unit (4) is attached to the lower part of the sector ear seat (7) of the gas turbine bearing (6) to complete the welding of the sector ear seat (7).

6. The method of using a welding device for a fan-shaped ear seat of a gas turbine bearing according to claim 5, characterized in that After the sector ear seat (7) is clamped, a preset distance of 3 mm is provided between the welding end of the sector ear seat (7) and the outer circumferential surface of the gas turbine bearing (6).

7. A method for using a welding device for a fan-shaped ear seat of a gas turbine bearing according to claim 5, characterized in that When the sector ear seat (7) is clamped on the first clamping member (18) and the second clamping member (19), a preset distance of 2.5 mm is provided between the bottom surface of the sector ear seat (7) and the bottom surfaces of the first clamping member (18) and the second clamping member (19).

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