Welding process for large-scale thin-wall air engine flow guide pipe with lug

Abstract

The application belongs to the technical field of aero-engine flow guide pipe and relates to a welding process method of a large-specification thin-wall aero-engine flow guide pipe with lugs, which comprises the following steps: S1: before welding, a positioning and clamping of the flow guide pipe and the lugs is performed by using an assembly positioning tool; S2: welding parameters are determined; S3: the flow guide pipe and the lugs after positioning and clamping are partitioned and symmetrically welded; a welding sequence is set as follows: an upper weld at lug I -> a lower weld at lug II -> a lower weld at lug I -> an upper weld at lug II -> a weld at lug III -> a weld at lug IV; and S4: after the parts are cooled, the parts are taken down, so as to control welding deformation. The welding process method of the large-specification thin-wall aero-engine flow guide pipe with lugs utilizes steel constraint to limit the welding of the lug structure, adopts a mode of first partitioning and then step-by-step welding for the same weld and symmetric welding for different welds, and limits and positions on the tool, so as to control welding deformation.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of an aero-engine flow guide pipe, and particularly relates to a welding process method for a large-specification thin-wall aero-engine flow guide pipe with lugs. BACKGROUND

[0002] The aero-engine flow guide pipe is a large-specification thin-wall sheet metal part, is an important component of an aero-engine, is a circular argon arc welding insertion welding structure with lugs, and is non-closed welding. The deformation at the welding position is not easy to control, and an irregular structure part is formed after welding. There is also a T-shaped welding with different wall thicknesses, and the welding difficulty is great. If a traditional continuous welding method with one welding seam is used, the single-sided welding seam is long. After the overall welding is completed, the thin-wall irregular sheet metal part is welded for a long time, and the heat input is large, which directly causes the lugs to be deformed in unilateral warping after welding, so that the welding of the welding seam on the opposite side cannot be performed, or stress concentration occurs after welding, and cracks are easily formed, resulting in product scrap. SUMMARY

[0003] In view of the deficiencies of the prior art, the present application provides a welding process method for a large-specification thin-wall aero-engine flow guide pipe with lugs. The same welding seam is welded in a manner of first partitioning and then step-by-step welding, and different welding seams are symmetrically welded. The flow guide pipe and the lugs are positioned and clamped on a fixture, and are welded, so as to control the welding deformation and meet the subsequent assembly requirements.

[0004] The specific technical solution is as follows:

[0005] The welding process method for the large-specification thin-wall aero-engine flow guide pipe with lugs comprises the following steps:

[0006] Step S1: Before welding, a positioning and clamping fixture is used to position and clamp the flow guide pipe and the lugs.

[0007] Step S2: Determine the welding parameters.

[0008] Step S3: Partition and symmetrically weld the clamped and positioned flow guide pipe and lugs.

[0009] The welding sequence is set as follows: upper side welding seam at lug I -> lower side welding seam at lug II -> lower side welding seam at lug I -> upper side welding seam at lug II -> welding seam at lug III -> welding seam at lug IV.

[0010] When the upper side welding seam at lug I, the upper side welding seam at lug II, the lower side welding seam at lug I, and the lower side welding seam at lug II are welded, the welding gun and the lug form the same included angle.

[0011] Step S4: After the part is cooled, the part is taken down, so as to control the welding deformation.

[0012] Further, in step S1, the positioning and clamping fixture comprises:

[0013] The base is used for mounting support of each structure.

[0014] The support is provided with a plurality of supports respectively arranged on the base for clamping and fixing the guide tube and the ear piece.

[0015] The special-shaped positioning pin is installed on one support for limiting assembly of the guide tube.

[0016] Further, the support includes support A, support B, support C, support D; wherein, the support B, the support C and the support D are arranged on the same straight line for clamping and fixing the guide tube; the support A is arranged on the bottom plate on the side of the support B for clamping and fixing the ear piece.

[0017] Further, the support D includes a support bottom plate D and a support block D with two sections of through holes with different hole diameters arranged on the support bottom plate D, and the support bottom plate D is fixed on the bottom plate through a connecting piece; the support block D includes a circular hole and a circular hole arranged coaxially, and one side of the circular hole is a flat surface; the support block D is installed with a special-shaped positioning pin for installing the guide tube and limiting the axial and radial direction of the guide tube;

[0018] The special-shaped positioning pin includes a plurality of cylindrical structures with different diameters arranged in sequence: a first cylinder, a second circular cylinder, a third cylinder, a fourth cylinder and a fifth cylinder; the diameter of the first cylinder is smaller than the minimum radial dimension of the through hole of the support block D, so as to facilitate the through hole of the support block D; the second circular cylinder is matched with the size and shape of the circular hole, so as to limit the radial movement and circumferential rotation of the special-shaped positioning pin; the diameter of the fourth cylinder is larger than the maximum radial dimension of the through hole of the support block D, and the side end surface of the fourth cylinder is matched with the side end surface of the support block D during assembly, so as to axially position the special-shaped positioning pin through the fourth cylinder; the fifth cylinder has a groove for installing the protruding end of the guide tube and an end sleeve structure for inserting the end of the guide tube, so as to realize installation of the protruding end of the guide tube through the fifth cylinder.

[0019] Further, the support A includes a support bottom plate A and a support block A in the shape of U arranged on the support bottom plate A, and the support bottom plate A is fixed on the base through a connecting piece; the ear piece is fixed on the upper end of the support block A through a pressing plate and a pressing plate positioning pin A.

[0020] Further, the support B includes a support bottom plate B and a support block B in the shape of U arranged on the support bottom plate B, and the support bottom plate B is fixed on the bottom plate through a connecting piece; the support block B has a guide tube pressing plate fixed on the top end through a pressing plate positioning pin B; for radial support and fixation of the guide tube.

[0021] Further, the support C includes a support bottom plate C and a support block C in a U shape arranged on the support bottom plate C, and the support bottom plate C is fixed on the bottom plate through a connecting piece; and the support block C is used for supporting and positioning the flow guide pipe in the radial direction.

[0022] Further, in the step S1, during positioning and clamping, first, the special-shaped positioning pin is installed on the support D, the position of the special-shaped positioning pin is adjusted, and the special-shaped positioning pin is clamped on the through hole of the support block D, then the flow guide pipe is placed on the support D on which the special-shaped positioning pin is installed through the support B and the support C, the rotating direction of the flow guide pipe is controlled, the protruding end of the flow guide pipe is inserted into the groove of the fifth cylinder, and the flow guide pipe pressing plate is fixed to the support B by the pressing plate positioning pin B of the support B, so that the position of the other end of the flow guide pipe is fixed, the positioning and installation of the flow guide pipe are realized.

[0023] Further, the pressing plate is in a circular sheet shape, is arranged between the ear and the pressing plate positioning pin A, and can fix and press the ear.

[0024] The beneficial effects of the present application are as follows:

[0025] The welding process method of the large-specification thin-wall aviation engine flow guide pipe with an ear piece provided by the present application uses steel constraint to limit the position of the flow guide pipe and the ear piece structure, adopts the mode of first zoning and then step-by-step welding for the same weld joint and symmetrical welding for different weld joints, limits and positions on the tooling, and welds, so as to control the welding deformation and ensure the subsequent assembly requirements of the part; through slow cooling treatment of the weld joint after each step of welding, the strong stress generated by single continuous welding is avoided, the risk of root cracking of the weld joint is reduced, the typical welding process method of the part is formed, and thus the part qualification rate is improved and the economic benefit is greatly improved. The project has good application prospect and application and reference value for the large-specification thin-wall aviation engine flow guide pipe structure with an ear piece. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a schematic view of the upper side weld joint at the ear piece I and the upper side weld joint at the ear piece II in the present application.

[0027] Figure 2 It is a schematic view of the lower side weld joint at the ear piece I, the lower side weld joint at the ear piece II, the weld joint at the ear piece III and the weld joint at the ear piece IV in the present application.

[0028] Figure 3 It is a schematic view of the structure of the assembly positioning tooling in the present application.

[0029] Figure 4 It is a schematic view of the local assembly and section structure of the flow guide pipe, the special-shaped positioning pin and the support D in the present application.

[0030] Figure 5 It is a local view of the support D in the present application.

[0031] Wherein, 1, flow guide pipe; 2, ear piece; 3, ear piece I upper side weld; 4, ear piece II upper side weld; 5, ear piece I lower side weld; 6, ear piece II lower side weld; 7, ear piece III weld; 8, ear piece IV weld; 11, base; 12, support; 121, support A; 122, support B; 123, support C; 124, support D; 13, flow guide pipe pressing plate; 14, support A screw; 15, support A positioning pin; 16, pressing plate; 17, pressing plate positioning pin A; 18, pressing plate positioning pin B; 19, special-shaped positioning pin; 191, first cylinder; 192, second cylinder; 193, third cylinder; 194, fourth cylinder; 195, fifth cylinder; 1241, round hole; 1242, circular hole. DETAILED DESCRIPTION

[0032] In order to better explain the present application, so as to understand, the following specific embodiments, combined with the drawings, the technical scheme and effect of the present application are described in detail.

[0033] The flow guide pipe 1 of the embodiment has a convex end on one side and a welding end on the other side. Due to the large size (the diameter of the conventional flow guide pipe is 20 mm, and the diameter of the flow guide pipe 1 in the embodiment is 50 mm) and the thin wall structure (the wall thickness is 1 mm) of the flow guide pipe 1, unilateral warping deformation easily occurs when the flow guide pipe 1 is welded with the ear piece 2, which causes the problem that the welding of the opposite side weld cannot be performed. A welding process method for a large-size thin-wall aviation engine flow guide pipe with an ear piece is provided, which includes the following steps.

[0034] Step S1: Before welding, the positioning and clamping of the flow guide pipe 1 and the ear piece 2 are performed by using an assembly positioning tool to achieve rigid constraint. As shown in Figure 3 The assembly positioning tool includes:

[0035] The base 11 is used for mounting and supporting various structures.

[0036] The support 12 has a plurality of support A 121, support B 122, support C 123 and support D 124, which are arranged on the base 11. Among them, the support B 122, the support C 123 and the support D 124 are arranged on the same straight line and are used for clamping and fixing the flow guide pipe 1. The support A 121 is arranged on the bottom plate on the side of the support B 122 and is used for clamping and fixing the ear piece 2.

[0037] The special-shaped positioning pin 19 is installed on one support D 124 and is used for limiting assembly of the flow guide pipe 1.

[0038] Specifically, according to the assembly position of the flow guide pipe 1 and the ear piece 2, the positions of the support A 121, the support B 122, the support C 123 and the support D 124 are set so that the ear piece 2 clamped on the support A 121 meets the assembly requirements of the flow guide pipe 1.

[0039] The support A121 includes a support bottom plate A and a support block A in U shape arranged on the support bottom plate A, the support bottom plate A is fixed on the base 11 through support A screws 14 and support A positioning pins 15; the ear piece 2 is fixed on the upper end of the support block A through a pressing plate 16 and a pressing plate positioning pin A 17; the pressing plate 16 is in a circular sheet shape, is arranged between the ear piece 2 and the pressing plate positioning pin A 17, and can play a fixed pressing role on the ear piece 2. The support block A mainly plays a limiting role on the pressing plate 16, and does not contact the main body of the flow guide pipe 1, but in order to leave sufficient welding space, the support block A is designed as an empty structure at the upper part, so that the welding gun can conveniently weld the ear piece 2.

[0040] As shown in Figure 3 , Figure 4 , Figure 5 The support D124 includes a support bottom plate D and a support block D with two sections of through holes with different hole diameters arranged on the support bottom plate D, the support bottom plate D is fixed on the base 11 through screws and positioning pins; the support block D includes a quasi-circular hole 1241 and a coaxially arranged circular hole 1242, as shown in Figure 5 One side of the quasi-circular hole 1241 is a flat surface; the support block D is provided with a special-shaped positioning pin 19, which is used for installing the flow guide pipe 1 and limiting the axial and radial directions of the flow guide pipe 1.

[0041] As shown in Figure 4As shown, the special-shaped positioning pin 19 includes a plurality of sequentially arranged cylindrical structures with different diameters: a first cylinder 191, a second type of cylinder 192, a third cylinder 193, a fourth cylinder 194, and a fifth cylinder 195. The first cylinder 191 is used to be inserted into the through hole of the support block D first, and plays a guiding role. The diameter of the first cylinder 191 is smaller than the minimum radial dimension of the through hole, so as to facilitate the passage through the through hole of the support block D. The second type of cylinder 192 is matched with the size and shape of the circular hole 1241. When the special-shaped positioning pin 19 is assembled with the through hole of the support block D, the flat end of the second type of cylinder 192 is matched with the flat end of the support block D, and then the second type of cylinder 192 and the third cylinder 193 are clamped into the through hole of the support block D (respectively installed in the circular hole 1241 and the circular hole 1242 of the support block D), so as to limit the radial movement and circumferential rotation of the special-shaped positioning pin 19. The fourth cylinder 194 has a diameter larger than the maximum radial dimension of the through hole of the support block D. When the special-shaped positioning pin 19 is assembled with the support block D, the side end face of the fourth cylinder 194 is matched with the side end face of the support block D, and then the special-shaped positioning pin 19 is axially positioned through the fourth cylinder 194 (the second type of cylinder 192 of the protruding through hole position after assembly can be radially arranged with a positioning pin, so as to prevent the special-shaped positioning pin 19 from being axially separated). The fifth cylinder has a groove for mounting the protruding end of the flow guide pipe 1 and a sleeve structure for inserting the end of the flow guide pipe 1. Since the position of the special-shaped positioning pin 19 is positioned by the support block D, the position of the protruding end of the flow guide pipe 1 after being mounted to the special-shaped positioning pin 19 is also positioned and mounted.

[0042] The support B122 includes a support base plate B and a U-shaped support block B arranged on the support base plate B. The support base plate B is fixed on the base 11 by screws and positioning pins. The top end of the support block B is fixed with a flow guide pipe pressing plate 13 by a pressing plate positioning pin B18, which is used for radially supporting and fixing the flow guide pipe 1.

[0043] The support C123 includes a support base plate C and a U-shaped support block C arranged on the support base plate C. The support base plate C is fixed on the base 11 by screws and positioning pins, which is used for radially positioning and supporting the flow guide pipe 1.

[0044] During positioning and clamping, the special-shaped positioning pin 19 is first mounted on the support D124. By adjusting the position of the special-shaped positioning pin 19, it is clamped on the through hole of the support block D. Then, the flow guide pipe 1 is arranged on the special-shaped positioning pin 19 according to the size of the flow guide pipe 1, and the flow guide pipe 1 is fixed on the special-shaped positioning pin 19 by a plurality of positioning pins 19a. Figure 4The tooling direction shown is inserted through support B122 and support C123 into support D124, where the irregular positioning pin 19 is installed. By controlling the rotation direction of the guide tube 1, the protruding end of the guide tube 1 is inserted into the groove of the fifth cylinder. The end part of the guide tube 1 can be placed in the sleeve structure of the irregular positioning pin 19, thereby restricting the guide tube 1 in multiple directions. At the same time, the pressure plate positioning pin B18 of support B122 is used to fix the guide tube pressure plate 13 to support B122, thereby fixing the position of the other end of the guide tube 1 and realizing the positioning and installation of the guide tube 1. Then, the lug 2 is inserted into the tail end opening of the guide tube 1, so that the round holes at both ends of the lug 2 are aligned with the two holes on the support block A. The pressure plate positioning pin A17 is used to fix the pressure plate 16, the guide tube 1, and the lug 2 to support A121 and tighten them to realize the positioning and assembly of the lug 2 and the guide tube 1. Since the guide tube 1 has a protruding end on one side, a welding end on the other side, and a cylindrical shape in the middle, and the guide tube 1 is large in size and has a thin-walled structure, it is not easy to position and clamp. The above-mentioned assembly and positioning fixture can easily clamp the guide tube 1 and the ear piece 2 on the fixture for welding. The above-mentioned fixture structure is simple and easy to operate.

[0045] Using the rigid constraints of the tooling, the two holes of the ear piece 2 are positioned by the pressure plate positioning pin A17, and the ear piece 2 is pressed tightly onto the positioning surface, that is, the upper end surface of the support block A; and the clamping plate 16 is used to fix it. The rigid fixing and calibration of the assembly positioning tooling fixture is used to offset the deformation caused by the welding shrinkage of the guide tube 1 assembly. By delaying or eliminating the deformation generated after welding, it is possible to ensure that the welding of the guide tube 1 assembly can achieve a better welding quality.

[0046] Step S2: Determine welding parameters;

[0047] By selecting appropriate welding current and cooling time, welding deformation can be effectively controlled.

[0048] Step S3: Weld the clamped and positioned guide tube 1 and ear plate 2;

[0049] Set the welding sequence as follows: Upper weld 3 at ear piece I → Lower weld 6 at ear piece II → Lower weld 5 at ear piece I → Upper weld 4 at ear piece II → Weld 7 at ear piece III → Weld 8 at ear piece IV.

[0050] like Figures 1-2In the embodiment, the flow guide pipe 1 and the ear piece 2 form two welds, each weld is welded in zones, forming three welding areas of upper, lower and side, a total of six welds: the upper side weld 3 at the ear piece I, the lower side weld 5 at the ear piece I, the weld 7 at the ear piece III, the lower side weld 6 at the ear piece II, the upper side weld 4 at the ear piece II, and the weld 8 at the ear piece IV; according to the situation after the ear piece 2 is welded in zones, the welding is performed in the limited state of the jig, and the welding is performed symmetrically in steps. First, the upper side weld 3 at the ear piece I is welded, the welding current is 30-50 A, the deformation is reduced on the basis of limiting the welding strength, after the weld is cooled for 30 seconds, the lower side weld 6 at the ear piece II is welded, the welding current is 25-40 A, the deformation is reduced on the basis of limiting the welding strength, after the weld is cooled for 30 seconds, the lower side weld 5 at the ear piece I is welded, the welding current is 25-40 A, the deformation is reduced on the basis of limiting the welding strength, after the weld is cooled for 30 seconds, the upper side weld 4 at the ear piece II is welded, the welding current is 30-50 A, the deformation is reduced on the basis of limiting the welding strength, after the weld at the place is cooled for 30 seconds, the weld 7 at the ear piece III is welded, the welding current is 25-30 A, the size of the weld at the place is small, a relatively small current is used to reduce heat input, and the deformation is further reduced, after the weld at the place is cooled for 30 seconds, the weld 8 at the ear piece IV is welded, the welding current is 25-30 A, the size of the weld at the place is small, a relatively small current is used to reduce heat input, and the deformation is further reduced, and the welding is performed in the limited state of the jig.

[0051] When the upper side weld 3 at the ear piece I, the upper side weld 4 at the ear piece II, the lower side weld 5 at the ear piece I, and the lower side weld 6 at the ear piece II are welded, the welding gun and the plane where the ear piece 2 is located form the same angle, specifically 60°.

[0052] When the upper side weld 3 at the ear piece I, the upper side weld 4 at the ear piece II, the lower side weld 5 at the ear piece I, and the lower side weld 6 at the ear piece II are welded respectively, the argon arc welding gun and the plane where the ear piece 2 is located form an angle of 60°, that is, when the welding gun is welded close to the main body direction of the flow guide pipe 1, the ear piece 2 produces a small deformation towards the flow guide pipe 1, then when the other side of the same weld is welded, the other side also forms an angle of 60° between the welding gun and the plane where the ear piece 2 is located, that is, the welding gun is welded close to the main body direction of the flow guide pipe 1, and the ear piece 2 produces a small deformation towards the other end of the flow guide pipe 1, the deformations in the two directions will restrict each other, and the purpose of controlling deformation is finally achieved; when the welding gun and the plane where the ear piece 2 is located form an angle of 60° for welding, the argon arc welding gun can be used for welding, and the deformation of the ear piece 2 can be minimized. After the opposite side is welded, the deformation in the opposite direction is generated, and finally the flow guide pipe 1 meets the assembly requirements.

[0053] By cooling and shrinking the local part after each step of welding, the internal stress is gradually released and redistributed, avoiding the strong stress generated by single continuous welding and reducing the risk of root cracking. By symmetrical welding, the heat input and shrinkage force are balanced on the circumference of the flow guide pipe 1, the unilateral warping deformation is maximally inhibited, and the subsequent assembly requirements of the welded part are ensured.

[0054] The welding sequence is set during the on-site welding process: the upper weld 3 at the ear piece I → the lower weld 6 at the ear piece II → the lower weld 5 at the ear piece I → the upper weld 4 at the ear piece II → the weld 7 at the ear piece III → the weld 8 at the ear piece IV; the weld at the ear piece 2 is welded as Figures 1-2 By setting the welding sequence of each welding area, the welding deformation is controlled, and the subsequent assembly requirements are met, that is, by setting the welding sequence of each welding area of a weld and symmetrically welding different welds (two welds are alternately welded), the unilateral warping deformation is maximally inhibited, and the purpose of controlling the welding deformation is achieved.

[0055] Step S4: After the part is cooled, the part is taken out, thereby controlling the welding deformation and ensuring that the part meets the assembly requirements.

[0056] After all the welds are welded, the part is taken out after being cooled for 15 seconds, thereby controlling the welding deformation and meeting the subsequent assembly requirements.

Claims

1. A welding process for a large-size thin-walled aero-engine guide tube with lugs, characterized in that, Includes the following steps: Step S1: Before welding, use an assembly positioning fixture to position and clamp the guide tube and lugs; The assembly positioning fixture includes: The base is used for mounting and supporting various structures. The support has multiple parts, which are respectively set on the base and used to clamp and fix the guide tube and the lug; The irregularly shaped locating pin is installed on a support and is used to limit the assembly of the guide tube; The support includes support A, support B, support C, and support D; wherein, support B, support C, and support D are arranged on the same straight line and are used to clamp and fix the guide tube; support A is inclinedly arranged on the base plate on one side of support B and is used to clamp and fix the lug. The support D includes a support base plate D and a support block D with two through holes of different diameters disposed on the support base plate D. The support base plate D is fixed to the base plate by a connector. The support block D includes a near-circular hole and a circular hole arranged coaxially. One side of the near-circular hole is a plane. The support block D is equipped with a special-shaped positioning pin, which is used to install the guide pipe and limit its axial and radial movement. The irregularly shaped positioning pin includes multiple cylindrical structures of different diameters arranged sequentially: a first cylinder, a second type of cylinder, a third cylinder, a fourth cylinder, and a fifth cylinder. The diameter of the first cylinder is smaller than the minimum radial dimension of the through hole of the support block D, facilitating its passage through the through hole of the support block D. The second type of cylinder is adapted to the size and shape of the near-circular hole, thereby limiting the radial movement and circumferential rotation of the irregularly shaped positioning pin. The diameter of the fourth cylinder is larger than the maximum radial dimension of the through hole of the support block D. During assembly, the side end face of the fourth cylinder fits against the side end face of the support block D, and the irregularly shaped positioning pin is axially positioned by the fourth cylinder. The fifth cylinder has a groove for installing the protruding end of the guide tube and an end sleeve structure for inserting the end of the guide tube, and the installation of the protruding end of the guide tube is achieved by the fifth cylinder. The support A includes a support base plate A and a U-shaped support block A disposed on the support base plate A. The support base plate A is fixed to the base by a connector. The lug is fixed to the upper end of the support block A by a pressing plate and a pressing plate positioning pin A. The support B includes a support base plate B and a U-shaped support block B disposed on the support base plate B. The support base plate B is fixed to the base plate by a connector. A guide tube pressure plate is fixed to the top of the support block B by a pressure plate positioning pin B, which is used to provide radial support and fixation for the guide tube. The support C includes a support base plate C and a U-shaped support block C disposed on the support base plate C. The support base plate C is fixed to the base plate by a connector; it is used to provide radial positioning support for the guide pipe. Step S2: Determine welding parameters; Step S3: Weld the clamped and positioned guide tube and ear piece in sections and symmetrically; Set the welding sequence as follows: upper weld at ear piece I → lower weld at ear piece II → lower weld at ear piece I → upper weld at ear piece II → weld at ear piece III → weld at ear piece IV; When welding the upper weld at ear piece I, the upper weld at ear piece II, the lower weld at ear piece I, and the lower weld at ear piece II, the welding torch forms the same angle with the surface where the ear piece is located; Step S4: After the part has cooled, remove it to control welding deformation.

2. The welding process method for a large-size thin-walled aero-engine guide tube with lugs according to claim 1, characterized in that, In step S1, during positioning and clamping, the irregular positioning pin is first installed on the support D. By adjusting the position of the irregular positioning pin, it is engaged with the through hole of the support block D. Then, the guide tube is passed through the support B and support C and placed on the support D with the irregular positioning pin installed. By controlling the rotation direction of the guide tube, the protruding end of the guide tube is inserted into the groove of the fifth cylinder. At the same time, the pressure plate positioning pin B of the support B is used to fix the guide tube pressure plate to the support B, thereby fixing the position of the other end of the guide tube and realizing the positioning and installation of the guide tube.

3. The welding process method for a large-size thin-walled aero-engine guide tube with lugs according to claim 1, characterized in that, The clamping plate is in the shape of a circular sheet and is placed between the ear piece and the positioning pin A of the clamping plate, which can fix and clamp the ear piece.

4. The welding process method for a large-size thin-walled aero-engine guide tube with lugs according to claim 1, characterized in that, The welding torch forms a 60° angle with the surface of the ear piece.

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