Welding method for thin-wall casing with rectifying support plate, product and application

Abstract

The invention belongs to the technical field of welding, and discloses a welding method for a thin-wall casing with a rectifying support plate, a product and application, and aims to realize temperature control of front and rear welding seams in the welding process and reduce the influence of heat of the front welding seam on the rear welding seam through a farthest distance sorting method. And meanwhile, the heat input quantity of the welding seams can be controlled through the segmented symmetric welding back method, the welding residual stress can be reduced through the heat treatment effect of the rear welding seam on the front end of the front welding seam, and welding deformation of the cartridge receiver assembly can be effectively controlled. The method is easy to operate, low in cost and capable of meeting the welding requirements of different specifications of thin-wall casings with supporting plates. The method is particularly important for development of a novel welding casing with a rectifying support plate of an aero-engine in the future.

Description

Technical Field

[0001] The present invention belongs to the field of welding technology, and specifically relates to a welding method, product and application of a thin-walled casing with a rectifier support plate. Background Art

[0002] The structure of the thin-walled welded casing assembly with rectifier support plate is as follows: Figure 1 and Figure 2 As shown, it is mainly composed of an outer casing 4, an inner casing 2, and 15 small rectifier support plates 1 and 5 large rectifier support plates 3 evenly distributed along the periphery. The thickness of the tapered wall of the outer casing and the inner casing along the flow channel is 1.5 mm. The large and small rectifier support plates are respectively inserted into the inner casing cavity and connected with the inner casing tapered flow channel wall by a butt weld, and pass through the special-shaped holes of the outer casing rectifier support plate mounting seat to be assembled and connected with the outer casing. The large and small rectifier support plates form 20 densely closed special-shaped welds evenly distributed along the circumference on the tapered wall of the inner casing.

[0003] The length of a single closed weld of a small rectifier support plate is 227.5 mm. Figure 3 As shown in (a), the length of a single closed weld of the large rectifier support plate is 240.6 mm. Figure 3 As shown in (b), the single welds of the large and small support plates are relatively long. When welding this closed special-shaped weld, the welding shrinkage constraint in the weld and the area near the weld is relatively large. The conventional continuous manual argon arc welding process method is used, and the welding residual stress in the weld and the area near the weld is large, and the instability deformation is serious. At the same time, the 20 closed special-shaped welds evenly distributed along the wall of the conical flow channel of the inner casing are welded in sequence using the conventional sequential welding process method. The welding residual stress is superimposed, and the deformation of the casing components will be more serious, which will not only affect the processing accuracy and dimensional stability of the components, but also affect the overall bearing capacity of the casing, posing a quality risk. Summary of the invention

[0004] The invention provides a welding method, product and application of a thin-walled casing with a rectifier support plate, which solves the problems of large residual stress and serious instability deformation in the weld and near-weld area in the conventional continuous manual argon arc welding process.

[0005] To achieve the above object, the present invention provides the following technical solutions: A method for welding a thin-walled casing with a rectifier support plate, comprising: Mark multiple circumferentially distributed welds in sequence; The circumferential welds are sorted according to the arrangement principle that every two welds are the farthest apart; Divide each weld into multiple sections and mark the multiple weld sections; Determine the welding sequence of each weld according to the symmetrical back-welding method; Welding is carried out according to the circumferential order of the welds and the welding order of each weld section.

[0006] Preferably, each weld is divided into multiple sections with a length of 20 to 30 mm.

[0007] Preferably, the arrangement order of the circumferential welds is specifically as follows: → → → → → → → →......→ ( , ,

[0008] In the formula, m1-m k are the k welds after marking, and k is the number of welds.

[0009] Preferably, each weld is divided into multiple sections, and the multiple sections are marked, and the marks of the multiple sections are 1-n in sequence.

[0010] Preferably, each weld is divided into multiple sections, and the multiple sections of welds are even-numbered welds.

[0011] Preferably, the welding sequence of each weld section is determined according to the symmetrical back-welding method as follows: 1→ n →2→( n -1) →...... →( ) → .

[0012] Preferably, welding is performed according to the circumferential sequence of the welds and the welding sequence of each weld segment as follows: According to the welding sequence of each weld section, each weld section is welded in turn in the circumferential order of the weld.

[0013] Preferably, argon arc welding is used for welding.

[0014] A product manufactured by the welding method of a thin-walled casing with a rectifier support plate.

[0015] The invention discloses an application of the thin-wall casing welding method with a rectifier support plate in the welding of thin-wall casing.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a method for welding thin-walled casings with rectifier support plates. Through the farthest distance sorting method, the temperature control of the front and rear welds during the welding process is achieved, reducing the influence of the heat of the front weld on the rear weld. At the same time, the segmented symmetrical back-welding method can control the heat input of the weld, and the heat treatment effect of the rear weld on the front end of the front weld can reduce the welding residual stress and effectively control the welding deformation of the casing assembly. The method is simple to operate and has low cost, and can meet the welding requirements of thin-walled casings with support plates of different specifications. The present invention is particularly important for the development of welded casings with rectifier support plates for future new aircraft engines. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a side view of the existing casing assembly structure; Figure 2 It is a top view of the existing casing assembly structure; Figure 3 a is a schematic diagram of the welding seam of the small support plate of the existing casing assembly. Figure 3 b is a schematic diagram of the existing large support plate weld; Figure 4 This is a flow chart of a method for welding a thin-walled casing with a rectifier support plate according to the present invention; Figure 5 This is a schematic diagram of the weld identification of a casing assembly according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the segmented marking of the closed weld of the support plate according to the embodiment of the present invention, and the arrow in the figure indicates the welding direction In the figure: 1- small rectifier support plate, 2- inner casing, 3- large rectifier support plate, 4- outer casing, 5- small end, 6- closed weld, 7- center line of casing assembly. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0021] In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, it is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0022] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0023] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0025] The present embodiment provides a method for welding a thin-walled casing with a rectifier support plate, comprising: S101 marks multiple circumferentially distributed welds in sequence; S102 Sort the circumferential welds according to the principle that every two welds are the farthest apart; S103 divides each weld into multiple sections and marks the multiple weld sections; S104 determines the welding sequence of each weld according to the symmetrical back-welding method; S105 performs welding according to the circumferential sequence of the welds and the welding sequence of each weld section.

[0026] The specific welding steps are: (1) For circumferential distributionk Each weld is marked in turn , , .... 。

[0027] (2) Sort the circumferential welds according to the principle that the distance between each two welds is the farthest: → → → → → → → →......→ ( , , If it is not an integer, it will be rounded off.)

[0028] (3) The weld seam is divided into several sections according to the length of 20 to 30 mm and marked in sequence 1 to n . ( n is an even number) (4) Repeat step 3 for each weld in turn.

[0029] (5) Determine the welding sequence of each weld according to the symmetrical back-welding method: 1→ n →2→( n -1) →...... →( ) → .

[0030] (6) The first section of the weld in step 5 is completed in the circumferential order of step 2. k Welding of the first section of the strip weld.

[0031] (7) Welding step 5 n The segment welds are completed in the circumferential order of step 2. k Weld No. n Segment welding.

[0032] (8) According to the welding sequence of step 5, repeat steps 6 and 7 to complete the second section weld, the first section weld and the second section weld. n -1) section weld,......( Section weld, Segment weld.

[0033] Embodiment 2: (1) If Figure 5 The 20 welds shown are marked A to T.

[0034] (2) The welding sequence of the 20 welds is: A→K→P→F→T→J→O→E→S→I→N→D→R→H→M→C→Q→G→L→B.

[0035] (3) If Figure 6 As shown, the closed weld is divided into 8 sections with a length of 20 to 30 mm, marked 1 to 8 respectively.

[0036] (4) Determine the welding sequence of each weld section according to the symmetrical back-welding method: 2→8→3→7→4→6→1→5.

[0037] (5) Weld the second section of the weld in the direction of Figure 6 As shown by the arrow, the second section of welding of 20 welds is completed in sequence according to step 2.

[0038] (6) Weld the 8th weld, the welding direction is Figure 6 As shown by the arrow, the welding of the 8th section of 20 welds is completed in sequence according to step 2.

[0039] (7) According to the welding sequence of step 4, repeat steps 5 and 6 to complete the welding of the 3rd, 7th, 4th, 6th, 1st and 5th sections in sequence.

[0040] Another embodiment of the present invention provides a product manufactured by a method for welding a thin-walled casing with a rectifying support plate, and an application of the method for welding a thin-walled casing with a rectifying support plate in welding thin-walled casing.

[0041] Although the embodiments of the present invention are described above in conjunction with the accompanying drawings, the present invention is not limited to the above-mentioned specific embodiments and application fields, and the above-mentioned specific embodiments are only illustrative and instructive, rather than restrictive. Under the guidance of the specification, a person skilled in the art can also make many forms without departing from the scope of protection of the claims of the present invention, all of which belong to the scope of protection of the present invention.

Claims

1. A method for welding a thin-walled casing with a rectifier support plate, characterized in that: include: Mark multiple circumferentially distributed welds in sequence; The circumferential welds are sorted according to the arrangement principle that every two welds are the farthest apart; Divide each weld into multiple sections and mark the multiple weld sections; Determine the welding sequence of each weld according to the symmetrical back-welding method; Welding is carried out according to the circumferential order of the welds and the welding order of each weld section.

2. A method for welding a thin-walled casing with a rectifier support plate according to claim 1, characterized in that: Divide each weld into multiple sections according to the length of 20 to 30 mm.

3. A method for welding a thin-walled casing with a rectifier support plate according to claim 1, characterized in that: The specific arrangement order of circumferential welds is: In the formula, m1-m k are the k welds after marking, and k is the number of welds.

4. A method for welding a thin-walled casing with a rectifier support plate according to claim 1, characterized in that: Each weld is divided into multiple sections, and the multiple sections are marked. The marks of the multiple sections are 1-n in sequence.

5. A method for welding a thin-walled casing with a rectifier support plate according to claim 4, characterized in that: Divide each weld into multiple sections, and multiple-section welds are welds with an even number of sections.

6. A method for welding a thin-walled casing with a rectifier support plate according to claim 5, characterized in that: According to the symmetrical back-welding method, the welding sequence of each weld is as follows:

7. A method for welding a thin-walled casing with a rectifier support plate according to claim 1, characterized in that: Welding is carried out according to the circumferential sequence of the weld and the welding sequence of each weld section as follows: According to the welding sequence of each weld section, each weld section is welded in turn in the circumferential order of the weld.

8. A method for welding a thin-walled casing with a rectifier support plate according to claim 1, characterized in that: The welding is done by argon arc welding.

9. A product manufactured by the welding method of a thin-walled casing with a rectifier support plate as described in any one of claims 1 to 9.

10. Application of a thin-walled casing welding method with a rectifier support plate as claimed in any one of claims 1 to 9 in thin-walled casing welding.

Images