A gas turbine exhaust pipe diffuser assembly welding tool and method

Abstract

A gas turbine exhaust pipe diffuser assembly welding tool and method, including an annular tensioning flange, the tensioning flange is composed of two half rings, the outer circumferential side wall of the tensioning flange is connected to a plurality of connecting plates distributed in an annular array, the connecting plate extends outward, and the end away from the tensioning flange is connected to a positioning plate; the connecting plate is in an inclined state, and when the tensioning flange is placed horizontally, the end of the connecting plate connected to the tensioning flange is lower than the end connected to the positioning plate; the front end of the positioning plate is provided with a positioning hole, and the rear end of the positioning plate is provided with a protrusion on the tensioning flange side. Also included are a hole opening template and an inspection template. Through the above structure and the method of assembling and welding the gas turbine exhaust pipe diffuser using the above tool, the assembly size of the diffuser can be guaranteed, the welding deformation can be controlled, and the gap and size of the diffuser body flange after the two halves of the gas turbine exhaust pipe are closed meet the requirements of the drawing.

Description

Technical Field

[0001] The invention relates to the technical field of gas steam turbines, and in particular to a gas turbine exhaust pipe diffuser assembly welding tool and method. Background Art

[0002] The gas turbine exhaust pipe diffuser is made of an inner diffuser and an outer diffuser connected and welded by 10 wing-shaped bodies, which are covered on the pipe body and are two-half structures. After the two halves are closed, the front and rear flanges of the inner and outer diffusers are required to be welded and polished to ensure a gap of 0-0.2mm, a roundness deformation tolerance of the outer cylinder ring pipe of ±1mm, and a height tolerance of ±1.5mm. The size is not easy to measure, and all parts are processed before welding. After the overall welding, they are not processed again, which requires extremely high control of assembly size and welding deformation.

[0003] The outer diffuser is composed of the front ring tube, front and rear cylinders, rear flange and other parts. The inner diffuser is composed of the front flange, front and rear cylinders, rear flange and other parts. The cylinder plates are all 6mm thin plates, with large welding volume and easy to produce welding deformation. Summary of the invention

[0004] The technical problem to be solved by the present invention is to solve the problems existing in the above-mentioned background technology and provide a gas turbine exhaust pipe diffuser assembly welding tool for welding positioning and size detection.

[0005] Another technical problem to be solved by the present invention is to provide a method for assembling and welding a gas turbine exhaust pipe diffuser tube by using a gas turbine exhaust pipe diffuser tube assembly welding tool to ensure the assembly size of the diffuser tube, control welding deformation, and make the diffuser tube flange gap and size meet the requirements of the drawing after the two halves of the gas turbine exhaust pipe are closed.

[0006] In order to realize the above-mentioned technical features, the object of the present invention is achieved as follows: A gas turbine exhaust pipe diffuser assembly welding tool comprises an annular tensioning flange, the tensioning flange is composed of two semi-rings, the outer circumferential side wall of the tensioning flange is connected with a plurality of connecting plates distributed in an annular array, the connecting plates extend outward, and the ends away from the tensioning flange are connected with positioning plates; the connecting plates are in an inclined state, and when the tensioning flange is placed horizontally, the end of the connecting plate connected to the tensioning flange is lower than the end connected to the positioning plate; the front end of the positioning plate is provided with a positioning hole, and the rear end of the positioning plate is provided with a protrusion on the tensioning flange side.

[0007] The butt joints of the two half rings are respectively provided with ear seats extending upwards, and the ear seats are provided with butt joint holes. The tensioning bolts pass through the butt joint holes of the two half rings to connect the two half rings into a ring shape.

[0008] It also includes an outer cylinder opening template for opening wing-shaped holes on the outer diffuser cylinder of the exhaust pipe diffuser of the gas turbine, and an inner cylinder opening template for opening wing-shaped holes on the inner diffuser cylinder of the exhaust pipe diffuser of the gas turbine.

[0009] The outer cylinder opening template and the inner cylinder opening template both include a cross center line arranged on the surface of the template body and a center hole located at the intersection of the cross center line.

[0010] Also included are a plurality of inspection templates for detecting the position of an outer diffuser ring pipe of an exhaust pipe diffuser of a gas turbine.

[0011] A protruding portion is provided at one end of the inspection template, and a scale is provided in the middle of the inspection template located on one side of the protruding portion; the protruding portions of the plurality of inspection templates have different heights.

[0012] A method for assembling a welding tool for a gas turbine exhaust pipe diffuser includes the following steps:

[0013] S1. According to the size of the gas turbine exhaust pipe body, the outer diffuser cylinder and the inner diffuser cylinder are laid out and cut into two fan-shaped structures respectively, and the fan-shaped structures are roll-bent to form a semi-conical structure; the two semi-conical outer diffuser cylinders are marked and opened with the outer cylinder opening template, and the two semi-conical inner diffuser cylinders are marked and opened with the inner cylinder opening template; wherein the gas turbine exhaust pipe body is divided into two halves in the axial direction;

[0014] S2. The two semi-conical outer diffuser cylinders and the two semi-conical inner diffuser cylinders with holes are divided into upper and lower halves from the center of the holes;

[0015] S3. The rear flange of the inner diffuser and the rear flange of the outer diffuser are respectively assembled and fixed in the grooves at the lower ends of the two halves of the gas turbine exhaust pipe body, and fixed;

[0016] S4. The lower halves of the outer diffuser cylinder and the inner diffuser cylinder are spot welded to the outer diffuser cylinder rear flange and the inner diffuser cylinder rear flange, respectively;

[0017] S5. The ends of the wing-shaped body are spot welded to the wing-shaped holes of the outer diffuser cylinder and the inner diffuser cylinder, wherein the wing-shaped body is a structure of upper and lower halves;

[0018] S6. The upper halves of the outer diffuser cylinder and the inner diffuser cylinder are spot welded to the lower halves of the outer diffuser cylinder and the inner diffuser cylinder, respectively;

[0019] S7. The semicircular outer diffuser ring tube is installed to the inner side of the upper end flange of the gas turbine exhaust pipe body through the annular plate;

[0020] S8. Close the two halves of the gas turbine exhaust pipe body and fix them with bolts; perform secondary welding on the welds of the outer diffuser cylinder, the inner diffuser cylinder, the wing-shaped body, and the welds between the outer diffuser cylinder and the outer diffuser cylinder rear flange, and between the inner diffuser cylinder and the inner diffuser cylinder rear flange;

[0021] S9. The welding fixture is connected and fixed to the upper flange, wherein the positioning hole of the welding fixture and the bolt hole of the upper flange are connected by fixing bolts;

[0022] S10. Install the front flange of the inner diffuser into the tensioning flange, tighten the tensioning bolts, and fix the front flange of the inner diffuser;

[0023] S11. Measure the deformation of the outer diffuser tube after welding, then fit the upper end of the outer diffuser tube ring tube to the protrusion, locate the height of the outer diffuser tube ring tube, check and adjust the distance between the outer diffuser tube ring tube and the inner circumferential wall of the upper flange by checking the sample, and then weld the outer diffuser tube ring tube to the outer diffuser tube;

[0024] S12. Measure the deformation of the inner diffuser after welding, adjust the size of the inner diffuser front flange according to the deformation, and weld the inner diffuser front flange to the inner diffuser when the installation height of the inner diffuser front flange meets the requirements;

[0025] S13. Remove the welding tooling, unbolt and open the two halves of the gas turbine exhaust pipe body, check the welding dimensions of the front flange of the inner diffuser, and make corrections;

[0026] S14. Use argon arc welding to weld the joint between the front flange of the inner diffuser and the inner diffuser body, draw a line and grind the weld surface with the Hough surface of the gas turbine exhaust pipe body as the reference, close it again, check the gap between the weld surfaces, and complete the assembly welding of the gas turbine exhaust pipe diffuser after there is no interference.

[0027] In S1, the fan-shaped plates for cutting and laying out the outer diffuser cylinder and the inner diffuser cylinder are first positioned and marked, and cross lines for positioning the wing-shaped body are drawn. After the fan-shaped plates are roll-bent, they are respectively marked through the outer cylinder opening template and the inner cylinder opening template, and the center hole is aligned with the intersection of the cross lines on the cylinder, and the cross center line is aligned with the cross lines on the cylinder.

[0028] In S11, the method of using the inspection template to inspect the outer diffuser tube annulus is as follows: the side of the inspection template with the scale is flush with the upper side surface of the upper end flange, the protruding part of the inspection template is aligned with the top surface of the outer diffuser tube annulus, and the height direction error value of the outer diffuser tube annulus is measured by replacing the inspection template with the protruding part of different heights; the side of the inspection template with the scale is flush with the upper side surface of the upper end flange, the inner side edge of the protruding part is aligned with the inner top surface of the outer diffuser tube annulus, and the horizontal direction error value of the outer diffuser tube annulus is measured according to the scale indication.

[0029] In S11-S12, the welding method is argon arc welding for base welding and gas shielded welding for cover welding.

[0030] The present invention has the following beneficial effects:

[0031] 1. When installing the diffuser in the gas turbine exhaust pipe, the assembly size of the diffuser can be guaranteed, the welding deformation can be controlled, and the flange gap and size of the diffuser body can meet the requirements of the drawing after the two halves of the gas turbine exhaust pipe are closed.

[0032] 2. The tensioning flange is composed of two half rings, so that the front flange of the inner diffuser can be clamped, which is convenient for positioning and welding the front flange of the inner diffuser.

[0033] 3. A protrusion is provided at the rear end of the positioning plate close to the tensioning flange, so as to facilitate positioning of the external diffuser ring tube through the protrusion.

[0034] 4. Use the outer cylinder opening template and the inner cylinder opening template to facilitate the opening of holes for installing the welded wing-shaped body in the outer diffuser cylinder and the inner diffuser cylinder. Since the cross-section of the wing-shaped body is relatively special, it is more convenient and accurate to use the template for drawing lines.

[0035] 5. Use inspection templates to check the welding height and horizontal installation position of the outer diffuser ring tube.

[0036] 6. By adopting a reasonable and effective welding method, corresponding welding tooling, and using opening templates and inspection templates, the manufacturing difficulties of this type of structure are solved. The diffuser tube manufactured by this method meets the requirements of the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the main structure of the welding tool of the present invention.

[0038] Figure 2 for Figure 1 Schematic diagram of the AA section structure.

[0039] Figure 3 It is a schematic diagram of the outer cylinder opening template structure of the present invention.

[0040] Figure 4 It is a schematic diagram of the inner cylinder opening template structure of the present invention.

[0041] Figure 5 This is a schematic diagram of the first inspection template structure of the present invention.

[0042] Figure 6 This is a schematic diagram of the second inspection template structure of the present invention.

[0043] Figure 7This is a schematic diagram of the third inspection template structure of the present invention.

[0044] Figure 8 This is a schematic diagram of the fourth inspection template structure of the present invention.

[0045] Fig. 9 It is a structural schematic diagram of the welding tool of the present invention when it is installed on the exhaust pipe body of a gas turbine for positioning.

[0046] Fig.10 for Fig. 9 Schematic diagram of the BB cross-section structure.

[0047] Fig.11 This is a schematic diagram of the height direction error dimension of the outer diffuser tube ring tube inspection sample of the present invention.

[0048] Fig.12 This is a schematic diagram of the horizontal error dimension of the outer diffuser tube ring tube for checking the inspection sample of the present invention.

[0049] Fig.13 The figure is a three-dimensional structural diagram of a gas turbine exhaust pipe body assembled and welded by the present invention.

[0050] Fig.14 It is a schematic diagram of the three-dimensional structure of the gas turbine exhaust pipe body assembled and welded by the present invention from another perspective.

[0051] In the figure: welding tool 10, tensioning flange 1, ear seat 11, docking hole 12, tensioning bolt 13, connecting plate 2, positioning plate 3, positioning hole 31, protrusion 32, outer cylinder opening template 4, cross center line 41, center hole 42, inner cylinder opening template 5, inspection template 6, extension 61, scale 62;

[0052] Gas turbine exhaust pipe body 100, outer diffuser cylinder 101, inner diffuser cylinder 102, outer diffuser ring pipe 103, upper end flange 104, outer diffuser rear flange 105, support part 106, inner diffuser rear flange 107, inner diffuser front flange 108, wing-shaped body 109, annular plate 110, fixing bolts 111. DETAILED DESCRIPTION

[0053] The embodiments of the present invention are further described below in conjunction with the accompanying drawings.

[0054] Embodiment 1:

[0055] See also Figure 1-8A gas turbine exhaust pipe diffuser assembly welding tool 10 includes an annular tensioning flange 1, which is composed of two half rings. The outer circumferential side wall of the tensioning flange 1 is connected to ten connecting plates 2 distributed in an annular array. The connecting plates 2 extend outward, and the ends away from the tensioning flange 1 are connected to positioning plates 3; the connecting plates 2 are in an inclined state, and when the tensioning flange 1 is placed horizontally, the end of the connecting plate 2 connected to the tensioning flange 1 is lower than the end connected to the positioning plate 3; the front end of the positioning plate 3 is provided with a positioning hole 31, and the rear end of the positioning plate 3 is provided with a protrusion 32 on the side close to the tensioning flange 1. The tensioning flange 1 is composed of two half rings, so that the front flange 108 of the inner diffuser can be clamped, which is convenient for positioning and welding the front flange 108 of the inner diffuser. The positioning plate 3 fits with the upper end flange 104, and the positioning hole 31 cooperates with the bolt hole of the upper end flange 104. The position of the welding tool 10 is fixed by fixing bolts 111. A protrusion 32 is provided at the rear end of the positioning plate 3 close to the tensioning flange 1 , so as to facilitate positioning of the outer diffuser ring tube 103 through the protrusion 32 .

[0056] Through the above structure, when the diffuser is installed in the gas turbine exhaust pipe, the assembly size of the diffuser can be guaranteed, the welding deformation can be controlled, and the flange gap and size of the diffuser body can meet the requirements of the drawing after the two halves of the gas turbine exhaust pipe are closed.

[0057] In a preferred embodiment, see Figure 1 , 2 The two half rings are respectively provided with ear seats 11 extending upward at the joints, and the ear seats 11 are provided with joint holes 12. The tension bolts 13 pass through the joint holes 12 of the two half rings to connect the two half rings into a ring. The structure is simple and easy to install. The two half rings are combined and connected into a ring, which is convenient for clamping the front flange 108 of the inner diffuser.

[0058] In a preferred embodiment, see Figure 3 , 4 In order to facilitate the opening of holes for installing and welding the wing-shaped body 109 on the outer diffuser cylinder 101 and the inner diffuser cylinder 102, since the cross section of the wing-shaped body 109 is relatively special, it is more convenient and accurate to use a template to draw lines. Therefore, it also includes an outer cylinder opening template 4 for opening wing-shaped holes on the outer diffuser cylinder 101 of the gas turbine exhaust pipe diffuser, and an inner cylinder opening template 5 for opening wing-shaped holes on the inner diffuser cylinder 102 of the gas turbine exhaust pipe diffuser. The opening template of the wing-shaped body 109 is designed according to the outer contour line of the wing-shaped body 109 on the outer diffuser cylinder 101 and the inner diffuser cylinder 102, and one opening template is used on each of the outer diffuser cylinder 101 and the inner diffuser cylinder 102.

[0059] In order to accurately align with the cross lines of the outer diffusion cylinder 101 and the inner diffusion cylinder 102, the outer cylinder opening template 4 and the inner cylinder opening template 5 both include a cross center line 41 set on the surface of the template body and a center hole 42 located at the intersection of the cross center line 41. The cross center line 41 and the center hole 42 are made at one time during laser cutting, and the cross center line 41 is a spaced hole.

[0060] In a preferred embodiment, see Figure 5-8 In order to facilitate the inspection of the welding installation position of the outer diffuser ring tube 103, four inspection templates 6 are also provided for position detection of the outer diffuser ring tube 103 of the gas turbine exhaust pipe diffuser.

[0061] Specifically, a protruding portion 61 is provided at one end of the inspection template 6, and a scale 62 is provided in the middle of the inspection template 6 located on one side of the protruding portion 61; the heights of the protruding portions 61 of the four inspection templates 6 are different.

[0062] Inspection template 6 Four sets of inspection templates are designed according to the height h from the top surface of the outer diffuser ring tube 103 to the flange surface of the upper end flange 104, namely h-1.5, h, h+1.5, and h+3. Among them, the h+3 template is used to check the assembly dimensions before welding, and the remaining templates are used to check the dimensions after welding.

[0063] Embodiment 2:

[0064] See also Figure 9-14 A method for assembling a welding tool for a gas turbine exhaust pipe diffuser includes the following steps:

[0065] S1. According to the size of the gas turbine exhaust pipe body 100, the outer diffuser cylinder 101 and the inner diffuser cylinder 102 are spread out and cut into two fan-shaped structures respectively, and the fan-shaped structures are roll-bent to form a semi-conical structure; the two semi-conical outer diffuser cylinders 101 are marked with lines and holes using the outer cylinder opening template 4, and the two semi-conical inner diffuser cylinders 102 are marked with lines and holes using the inner cylinder opening template 5; wherein, the gas turbine exhaust pipe body 100 is divided into two halves axially.

[0066] S2. The two semi-conical outer diffusion cylinders 101 and the two semi-conical inner diffusion cylinders 102 with holes are respectively divided into upper and lower halves from the center of the holes. Fig.14Since the gas turbine exhaust pipe body 100 is composed of two halves, and is composed of an outer shell and an inner shell, there is an integrally formed support portion 106 between the inner shell and the outer shell to connect the inner shell and the outer shell into a whole. Five integrally formed support portions 106 are provided between each half of the inner shell and the outer shell. Therefore, in order to avoid the support portions 106, the two semi-conical outer diffuser cylinders 101 and the two semi-conical inner diffuser cylinders 102 need to be divided into upper and lower halves from the center of the opening, so that they can be installed and welded from the upper and lower directions.

[0067] S3. The inner diffuser rear flange 107 and the outer diffuser rear flange 105 are respectively assembled and fixed in the notches at the lower ends of the two halves of the gas turbine exhaust pipe body 100 and fixed.

[0068] S4. Spot weld the lower halves of the outer diffuser cylinder 101 and the inner diffuser cylinder 102 to the outer diffuser cylinder rear flange 105 and the inner diffuser cylinder rear flange 107 respectively.

[0069] S5. Spot weld the two ends of the wing-shaped body 109 to the wing-shaped holes of the outer diffuser cylinder 101 and the inner diffuser cylinder 102, respectively. The wing-shaped body 109 is a structure of upper and lower halves. The wing-shaped body 109 is sleeved outside the support part 106, so it also needs to be cut into two halves to wrap around the support part 106 from the upper and lower directions and then welded. The cross section of the wing-shaped body 109 is Figure 3 , 4 The hollow tube body shown is sleeved on the outside of the support portion 106 during welding installation.

[0070] S6. Spot-weld the upper halves of the outer diffuser cylinder 101 and the inner diffuser cylinder 102 to the lower halves of the outer diffuser cylinder 101 and the inner diffuser cylinder 102 respectively.

[0071] S7. The semicircular outer diffuser ring tube 103 is movably mounted to the inner side of the upper end flange 104 of the gas turbine exhaust pipe body 100 through the annular plate 110. The annular plate 110 is a plate-shaped semicircular ring whose outer circumference is inserted into the annular groove inside the upper end flange 104. The maximum diameter top of the outer diffuser ring tube 103 is provided with an annular groove, and the inner circumference of the annular plate 110 is inserted into the annular groove provided in the outer diffuser ring tube 103.

[0072] S8. The two halves of the gas turbine exhaust pipe body 100 are closed and fixed with bolts; the welds of the outer diffuser cylinder 101, the inner diffuser cylinder 102, the wing-shaped body 109, and the welds between the outer diffuser cylinder 101 and the outer diffuser rear flange 105, and between the inner diffuser cylinder 102 and the inner diffuser rear flange 107 are subjected to secondary welding.

[0073] S9. Connect and fix the welding tool 10 to the upper flange 104 , wherein the positioning holes 31 of the welding tool 10 and the bolt holes of the upper flange 104 are connected by fixing bolts 111 .

[0074] S10. Clamp the front flange 108 of the inner diffuser into the tensioning flange 1, tighten the tensioning bolts 13, and fix the front flange 108 of the inner diffuser.

[0075] S11. Measure the deformation of the outer diffuser cylinder 101 after welding, then fit the upper end of the outer diffuser ring tube 103 with the protrusion 32, locate the height of the outer diffuser ring tube 103, check and adjust the distance between the outer diffuser ring tube 103 and the inner circumferential wall of the upper end flange 104 through the inspection template 6, and then weld the outer diffuser ring tube 103 to the outer diffuser cylinder 101. At the same time, weld the outer diffuser ring tube 103 to the annular plate 110, and the annular plate 110 to the upper end flange 104.

[0076] S12. Measure the deformation of the inner diffuser body 102 after welding, adjust the size of the inner diffuser front flange 108 according to the deformation, and weld the inner diffuser front flange 108 to the inner diffuser body 102 when the installation height of the inner diffuser front flange 108 meets the requirements.

[0077] S13. Remove the welding tool 10, remove the bolts to open the two halves of the gas turbine exhaust pipe body 100, check the welding dimensions of the front flange 108 of the inner diffuser, and make corrections.

[0078] S14. Use argon arc welding to weld the joint of the front flange 108 of the inner diffuser and the inner diffuser body 102, draw a line and grind the weld surface with the half surface of the gas turbine exhaust pipe body 100 as the reference, close again, check the gap of the weld surface, and complete the assembly welding of the gas turbine exhaust pipe diffuser after there is no interference. The half surface is the surface where the two halves of the gas turbine exhaust pipe body 100 are joined when they are closed.

[0079] In S1, the fan-shaped plates for cutting and laying out the outer diffuser cylinder 101 and the inner diffuser cylinder 102 are first positioned and marked, and cross lines for positioning the wing-shaped body 109 are drawn. After the fan-shaped plates are roll-bent into shape, lines are drawn through the outer cylinder opening template 4 and the inner cylinder opening template 5 respectively, and the center hole 42 is aligned with the intersection of the cross lines on the cylinder, and the cross center line 41 is aligned with the cross lines on the cylinder.

[0080] In S11, the method of using the inspection template 6 to inspect the outer diffuser tube annular tube 103 is as follows: the side of the inspection template 6 with the scale 62 is flush with the upper side surface of the upper end flange 104, the protruding portion 61 of the inspection template 6 is aligned with the top surface of the outer diffuser tube annular tube 103, and the height direction error value of the outer diffuser tube annular tube 103 is measured by replacing the inspection template 6 with the protruding portion 61 of different heights; the side of the inspection template 6 with the scale 62 is flush with the upper side surface of the upper end flange 104, the inner side edge of the protruding portion 61 is aligned with the inner top surface of the outer diffuser tube annular tube 103, and the horizontal direction error value of the outer diffuser tube annular tube 103 is measured according to the indication of the scale 62.

[0081] In S11-S12, the welding method is argon arc welding for base welding and gas shielded welding for cover welding. It reduces welding deformation and has high structural strength.

[0082] By adopting effective welding methods, corresponding welding tooling, and reasonable testing methods such as samples, the manufacturing difficulties of this type of structure have been solved. The diffuser tube manufactured by this method meets the requirements of the drawings.

[0083] Embodiment three:

[0084] Take the H25 diffuser assembly as an example.

[0085] 1. Design the corresponding template and tooling according to the dimensions of the H25 wing-shaped body and annular tube / flange. Prepare the outer diffuser annular tube 103, the outer diffuser rear flange 105, the inner diffuser rear flange 107, the inner diffuser front flange 108, the outer diffuser body 101, the inner diffuser body 102, and the wing-shaped body 109. Draw lines on the outer diffuser body 101 and the inner diffuser body 102 using the opening template, and open 10 holes for the wing-shaped body 109.

[0086] 2. Assemble the outer diffuser rear flange 105 and the inner diffuser rear flange 107 on the two halves of the gas turbine exhaust pipe body 100, and fix them with a clamp. Assemble the inner diffuser body 102, the outer diffuser ring pipe 103, the wing-shaped body 109, the inner diffuser front flange 108, and the outer diffuser ring pipe 103 in sequence.

[0087] 3. The outer diffuser annular tube 103 is inspected according to the size template and fixed by the positioning plate 3. The front flange of the inner diffuser is tightened by the tensioning flange 1.

[0088] 3. Close the two halves of the gas turbine exhaust pipe body 100, switch to electric welding, and do not weld the outer diffuser ring pipe 103 and the inner diffuser front flange 108 welds first. Use the inspection sample 6 to check the dimensions, and adjust the ring pipe / inner front flange assembly dimensions according to the deformation. After fixing with the assembly welding fixture, perform secondary welding. Use the welding process of argon arc welding for the base and gas shielded welding for the cover.

[0089] 4. Remove all tooling, check the dimensions, and make corrections. Separate the two halves of the gas turbine exhaust pipe body 100, and use argon arc welding to weld the flange joint according to the drawing. Draw a line with the half surface of the carbon steel body as the reference, grind the weld surface according to the line, close it again, and use a feeler gauge to check the gap between the weld surfaces to meet the gap requirement of 0-0.2mm.

[0090] 5. The H25 pipe manufactured using the above-mentioned assembly welding method and tooling has been inspected and its dimensions are found to be in full compliance with the requirements of the drawings.

Claims

1. A gas turbine exhaust pipe diffuser assembly welding tool (10), characterized in that: The invention comprises an annular tensioning flange (1), wherein the tensioning flange (1) is composed of two half rings, and the outer circumferential side wall of the tensioning flange (1) is connected to a plurality of connecting plates (2) distributed in an annular array, and the connecting plates (2) extend outwardly, and the ends away from the tensioning flange (1) are connected to the positioning plates (3); the connecting plates (2) are in an inclined state, and when the tensioning flange (1) is placed horizontally, the end of the connecting plate (2) connected to the tensioning flange (1) is lower than the end connected to the positioning plate (3); the front end of the positioning plate (3) is provided with a positioning hole (31), and the rear end of the positioning plate (3) is provided with a protrusion (32) on the side close to the tensioning flange (1); The butt joints of the two half rings are respectively provided with ear seats (11) extending upwards, the ear seats (11) are provided with butt joint holes (12), and the tensioning bolts (13) pass through the butt joint holes (12) of the two half rings to connect the two half rings into a ring shape; It also includes an outer cylinder body opening template (4) for opening wing-shaped holes in an outer diffuser cylinder body (101) of a gas turbine exhaust pipe diffuser, and an inner cylinder body opening template (5) for opening wing-shaped holes in an inner diffuser cylinder body (102) of a gas turbine exhaust pipe diffuser.

2. A gas turbine exhaust pipe diffuser assembly welding tool (10) according to claim 1, characterized in that: The outer cylinder opening template (4) and the inner cylinder opening template (5) both comprise a cross center line (41) arranged on the surface of the template body and a center hole (42) located at the intersection of the cross center line (41).

3. The gas turbine exhaust pipe diffuser assembly welding tool (10) according to claim 1, characterized in that: Also included are a plurality of inspection templates (6) for detecting the position of an outer diffuser ring tube (103) of a gas turbine exhaust pipe diffuser.

4. A gas turbine exhaust pipe diffuser assembly welding tool (10) according to claim 3, characterized in that: A protruding portion (61) is provided at one end of the inspection template (6), and a scale (62) is provided in the middle of the inspection template (6) located on one side of the protruding portion (61); the protruding portions (61) of the plurality of inspection templates (6) have different heights.

5. The method for installing a gas turbine exhaust pipe diffuser assembly welding tool according to claim 4, characterized in that: It includes the following steps: S1. According to the size of the gas turbine exhaust pipe body (100), the outer diffuser cylinder (101) and the inner diffuser cylinder (102) are expanded and cut into two fan-shaped structures, and the fan-shaped structures are roll-bent to form semi-conical structures; the two semi-conical outer diffuser cylinders (101) are marked with lines and holes are opened using an outer cylinder opening template (4), and the two semi-conical inner diffuser cylinders (102) are marked with lines and holes are opened using an inner cylinder opening template (5); wherein the gas turbine exhaust pipe body (100) is divided into two halves in the axial direction; S2. The two semi-conical outer diffusion cylinders (101) with holes opened and the two semi-conical inner diffusion cylinders (102) are respectively divided into upper and lower halves from the center of the opening; S3. The inner diffuser rear flange (107) and the outer diffuser rear flange (105) are respectively assembled and fixed in the grooves at the lower ends of the two halves of the gas turbine exhaust pipe body (100), and fixed; S4. Spot welding the lower halves of the outer diffuser cylinder (101) and the inner diffuser cylinder (102) to the outer diffuser cylinder rear flange (105) and the inner diffuser cylinder rear flange (107), respectively; S5. Spot welding the two ends of the wing-shaped body (109) to the wing-shaped holes of the outer diffuser cylinder (101) and the inner diffuser cylinder (102), respectively, wherein the wing-shaped body (109) is a structure of upper and lower halves; S6. spot welding the upper halves of the outer diffuser cylinder (101) and the inner diffuser cylinder (102) to the lower halves of the outer diffuser cylinder (101) and the inner diffuser cylinder (102), respectively; S7. The semicircular outer diffuser ring tube (103) is movably mounted to the inner side of the upper end flange (104) of the gas turbine exhaust pipe body (100) through the annular plate (110); S8. The two halves of the gas turbine exhaust pipe body (100) are closed and fixed with bolts; the welds of the outer diffuser cylinder (101), the inner diffuser cylinder (102), and the wing-shaped body (109), as well as the welds between the outer diffuser cylinder (101) and the outer diffuser cylinder rear flange (105), and between the inner diffuser cylinder (102) and the inner diffuser cylinder rear flange (107) are subjected to secondary welding; S9. Connecting and fixing the welding fixture (10) to the upper flange (104), wherein the positioning hole (31) of the welding fixture (10) and the bolt hole of the upper flange (104) are connected by fixing bolts (111); S10. The front flange (108) of the inner diffuser is mounted inside the tensioning flange (1), and the tensioning bolts (13) are tightened to fix the front flange (108) of the inner diffuser; S11. measuring the deformation of the outer diffuser cylinder (101) after welding, then fitting the upper end of the outer diffuser cylinder ring tube (103) to the protrusion (32), positioning the height of the outer diffuser cylinder ring tube (103), checking and adjusting the distance between the outer diffuser cylinder ring tube (103) and the inner circumferential wall of the upper end flange (104) by using the inspection template (6), and then welding the outer diffuser cylinder ring tube (103) to the outer diffuser cylinder (101); S12. measuring the deformation of the inner diffuser cylinder (102) after welding, adjusting the size of the inner diffuser cylinder front flange (108) according to the deformation, and welding the inner diffuser cylinder front flange (108) to the inner diffuser cylinder (102) when the installation height of the inner diffuser cylinder front flange (108) meets the requirements; S13. Remove the welding tool (10), remove the bolts to open the two halves of the gas turbine exhaust pipe body (100), check the welding dimensions of the front flange (108) of the inner diffuser, and calibrate; S14. Use argon arc welding to weld the joint between the front flange (108) of the inner diffuser and the inner diffuser body (102). Draw a line and grind the weld surface with the Hough surface of the gas turbine exhaust pipe body (100) as the reference. Close again and check the gap between the weld surfaces. When there is no interference, complete the assembly welding of the gas turbine exhaust pipe diffuser.

6. The method for installing a gas turbine exhaust pipe diffuser assembly welding tool according to claim 5, characterized in that: In S1, the fan-shaped plates for the outer diffuser cylinder (101) and the inner diffuser cylinder (102) are first positioned and marked, and cross lines for positioning the wing-shaped body (109) are drawn. After the fan-shaped plates are roll-bent, they are respectively marked through the outer cylinder opening template (4) and the inner cylinder opening template (5), and the center hole (42) is aligned with the intersection of the cross lines on the cylinder, and the cross center line (41) is aligned with the cross lines on the cylinder.

7. The method for installing a gas turbine exhaust pipe diffuser assembly welding tool according to claim 5, characterized in that: In S11, the method of using the inspection template (6) to inspect the outer diffuser tube ring tube (103) is as follows: the side of the inspection template (6) with the scale (62) is flush with the upper side surface of the upper end flange (104), the extension (61) of the inspection template (6) is aligned with the top surface of the outer diffuser tube ring tube (103), and the height direction error value of the outer diffuser tube ring tube (103) is measured by replacing the inspection template (6) with the extension (61) of different heights; the side of the inspection template (6) with the scale (62) is flush with the upper side surface of the upper end flange (104), the inner side edge of the extension (61) is aligned with the inner top surface of the outer diffuser tube ring tube (103), and the horizontal direction error value of the outer diffuser tube ring tube (103) is measured according to the indication of the scale (62).

8. The method for installing a gas turbine exhaust pipe diffuser assembly welding tool according to claim 5, characterized in that: In S11-S12, the welding method is argon arc welding for base welding and gas shielded welding for cover welding.

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