CN111515513A

CN111515513A - Welding method of high-temperature alloy drum barrel rotor assembly

Info

Publication number: CN111515513A
Application number: CN202010262469.8A
Authority: CN
Inventors: 郑欣; 陈玉宝; 师玉英; 张伟杰; 王广海; 李刚
Original assignee: AECC Harbin Dongan Engine Co Ltd
Current assignee: AECC Harbin Dongan Engine Co Ltd
Priority date: 2020-04-03
Filing date: 2020-04-03
Publication date: 2020-08-11

Abstract

The invention belongs to the technical field of aeroengine machining, and particularly relates to a welding method of a high-temperature alloy drum rotor assembly. Wherein, the electron beam welding adopts a specific welding sequence and a welding process. By adopting the process methods such as the electron beam welding parameters, the welding sequence and the like, the deformation of the high-temperature alloy rotor assembly after welding can be effectively controlled, the internal quality of the welding seam is improved, and the welding qualification rate is obviously improved.

Description

Welding method of high-temperature alloy drum barrel rotor assembly

Technical Field

The invention relates to a welding method, in particular to a welding method of a high-temperature alloy drum rotor assembly.

Background

A compressor rotor assembly of an engine of a certain model is In718 nickel-based high-temperature alloy, and is formed by welding 6 rotors of five-stage, six-stage, seven-stage, eight-stage, nine-stage and ten-stage rotors through five welding seams, and the structural schematic diagram of the compressor rotor assembly is shown In figure 1. Because the distance between the auxiliary plates is narrow, the structure that the lining plate is added to the back of the welding line is adopted, a cutter cannot stretch into the welding line for processing, and the defect of removing the back of the welding line cannot be removed. In order to guarantee the integral assembly positioning of the assembly, the outer spigot and small interference fit structural design is adopted, and the welded seam is machined and welded to be positive, so that the machining requirement of the rotor assembly is met.

The rotor assembly requires a weld depth of the final welded product of 2.5 mm. The runout of the bottom surface of each level of the auxiliary rotor plate is less than or equal to 0.15mm, the runout of the left end surface of each six-level to ten-level auxiliary plate is less than or equal to 0.25mm, and the runout of the left end surface of the fifth-level auxiliary plate is less than or equal to 0.10mm (see figure 1). Because the product welding seam is many, and the fit-up gap is strict, and the subassembly is beated after welding and is required highly, and outer tang design leads to welding seam centering difficulty scheduling problem, and whole welding seam quality is difficult to guarantee, and the subassembly subplate department runout volume very easily causes the super poor after welding.

Disclosure of Invention

The invention aims to provide a welding method of a high-temperature alloy drum rotor assembly, which can effectively control the integral deformation of parts and ensure the requirement of the runout of the welded assembly.

The specific technical scheme of the invention is as follows: a method of welding a superalloy drum rotor assembly, the method comprising the steps of;

1. the method comprises the following steps of (1) cleaning before electron beam welding: mechanically cleaning each stage of compressor rotor to remove an oxide film at a position to be welded; then ultrasonic cleaning is carried out to remove oil stains on the surface;

2. assembling, namely, performing interference fit on each stage of rotor to complete assembling before welding;

3. numbering a plurality of welding lines in sequence, and performing positioning welding on the plurality of welding lines by adopting electron beam welding;

4. adopting electron beam welding to weld the seams, and carrying out electron beam welding according to the sequence of the serial numbers from small to large, odd numbers and even numbers;

5. after electron beam welding, machining the front side of a welding seam to meet the requirement of the thickness of the welding seam;

6. carrying out conventional stress relief heat treatment after welding to eliminate stress;

7. performing fluorescence inspection on the surface of the welding seam, wherein the surface of the welding seam is required to have no linear defects such as cracks, pores and the like;

8. and finally, checking, namely checking the jumping amount of each level of auxiliary plates after the welding of the product.

The beneficial technical effects are as follows: the invention welds five welding seams of the compressor rotor by the electron beam welding process. Reasonable welding sequence and welding parameters are adopted to control welding deformation, improve welding seam quality, overcome the technical problems of large quantity of integral welding seams of products, difficult control of welding deformation, over-tolerance of jumping quantity and the like, and meet design requirements. The fluorescent inspection of the welded product meets the design requirements and the runout of the rotor assembly meets the requirements of fig. 1.

Drawings

Fig. 1 is a schematic view of the structure of a compressor rotor assembly.

Detailed Description

As shown, a vacuum electron beam welding method of a high temperature alloy rotor assembly includes the following steps:

1. and mechanically cleaning the five-level to ten-level rotor, polishing the to-be-welded part by 600-800-mesh sand paper, and removing the redundant substances such as an oxide film, burrs and the like on the surface. Then ultrasonic cleaning is carried out for more than 30min to remove oil stains on the surface of the part.

2. And heating the rotors at all stages to 110 ℃ in an air furnace, preserving heat for 60min, taking out, respectively assembling the five-stage and six-stage, seven-stage and eight-stage, nine-stage and ten-stage rotor assemblies in pairs, and then heating the seven-stage and eight-stage rotor assemblies again to complete the assembly with the five-stage and six-stage assemblies. Finally, the nine-stage and ten-stage assemblies are heated to complete the assembly with the five-stage, six-stage, seven-stage and eight-stage assemblies.

3. And (3) performing positioning welding on the positions I-V by adopting electron beam welding, wherein the positioning welding process parameters are as follows:

and 8 sections of welding seams are uniformly and symmetrically positioned on the circumference of each welding seam, and the length of each section is 140 mm.

Acceleration voltage: 150Kv

Welding current: 2.0-6.0 mA

Focusing current: 2000 to 2300mA

Welding speed: 10 to 30mm/s

Waveform: straight line

Distance between the workpiece and the welding gun: 300-700 mm

4. Performing electron beam welding on the positions I-V by adopting electron beam welding according to the sequence of welding seams I → III → V → II → IV, wherein the parameters are as follows:

acceleration voltage: 150Kv

Welding current: 20 to 50mA

Focusing current: 2000 to 2300mA

Welding speed: 20 to 40mm/s

Waveform: straight line

Distance between the workpiece and the welding gun: 300-700 mm

5. And (3) adding the surface of a welding seam on the electron beam post-welding machine, and processing the thickness of the post-welding machine from 3.5mm to 2.5mm to meet the requirement of the thickness of the welding seam on the drawing.

6. Conventional stress relief heat treatment is performed after welding to relieve stress.

7. And performing fluorescence inspection on the surface of the welding seam, wherein the surface of the welding seam has no linear defects such as cracks, pores and the like.

8. And finally, inspecting the jumping amount of the welded product. And measuring actual values of the bounce quantities of the bottom surface and the end surface of the auxiliary plate of the five-level to ten-level rotor.

Examples

The material of a certain aeroengine compressor rotor is In718 high-temperature alloy, the part is formed by connecting 6 groups of rotors through five welding lines, the depth of the welding line before welding is 3.5mm, and the thickness of the welding line after welding is required to be processed to be 2.5 mm. The rotor assembly requires that the runout of the bottom surface of the auxiliary plate after welding is less than or equal to 0.15mm, the runout of the left end surface of the six-level to ten-level auxiliary plate is less than or equal to 0.25mm, and the runout of the left end surface of the fifth-level auxiliary plate is less than or equal to 0.10 mm.

Because the requirement of the post-welding jumping amount of the rotor assembly is strict, reasonable process parameters are required to ensure the requirement of the post-welding size.

The specific implementation mode is as follows:

3. And (3) performing tack welding on the positions I-V by adopting electron beam welding, wherein the tack welding process parameters are shown in the following table:

TABLE 1 tack weld parameters for rotor assemblies

4. Electron beam welding was performed at positions I to V by electron beam welding, and the welding parameters are shown in Table 2. The welding sequence is as follows: firstly, performing formal welding on each welding seam in the sequence of the welding seam I → III → V → II → IV, wherein the welding parameters are shown in the following table:

TABLE 2 Electron Beam welding parameters of rotor assemblies

5. And (3) processing the I-V welding seam after electron beam welding, machining the surface of the welding seam, and processing the thickness of the welded seam from 3.5mm to 2.5mm to meet the requirement of the thickness of the welding seam on a drawing.

7. performing fluorescence inspection on the surface of the welding seam, wherein the surface of the welding seam has no linear defects such as cracks, pores and the like;

8. and finally, checking and detecting the jitter values of the rotors at all stages. See table below:

TABLE 3 run-out actual value (mm) of post-weld rotor assembly

And (4) conclusion: and (4) passing.

Claims

1. A method of welding a superalloy drum rotor assembly, comprising the steps of;

the first step, cleaning before welding,

secondly, assembling the components to be welded,

thirdly, numbering a plurality of welding lines in sequence, adopting electron beam welding to perform positioning welding on the plurality of welding lines,

fourthly, welding the weld seams by adopting electron beam welding, and carrying out electron beam welding according to the sequence of the serial numbers from small to large, odd numbers and odd numbers;

fifthly, performing conventional stress relief heat treatment to eliminate stress;

sixthly, carrying out fluorescence inspection on the surface of the welding seam, and inspecting the conditions of cracks and pores on the surface of the welding seam;

and seventhly, checking the jumping quantity of each level of auxiliary plates after welding.

2. The method of welding a superalloy drum rotor assembly according to claim 1, wherein: in the first step, the specific cleaning method is as follows: mechanically cleaning each stage of compressor rotor to remove an oxide film at a position to be welded; and then ultrasonic cleaning is carried out to remove oil stains on the surface.

3. The method of welding a superalloy drum rotor assembly according to claim 2, wherein: mechanical cleaning uses sand paper to polish the surfaces to be welded.

4. The method of welding a superalloy drum rotor assembly according to claim 1, wherein: and during assembly, rotors at all stages adopt interference fit.

5. The method of welding a superalloy drum rotor assembly according to claim 1, wherein: and fourthly, when the electronic beam welding is adopted to weld the welding seam, the electronic beam welding is carried out according to the sequence that the serial number is from small to large, and the first number is even and then the second number is odd.

6. The method of welding a superalloy drum rotor assembly according to claim 1 or 5, wherein: the technological parameters of the electron beam welding are as follows:

acceleration voltage: the pressure of the mixture is 150Kv,

welding current: 20-50 mA of the electric current is supplied,

focusing current: 2000 to 2300mA, and a first electrode,

welding speed: 20 to 40mm/s of the total amount of the catalyst,

waveform: the straight line is a straight line,

distance between the workpiece and the welding gun: 300-700 mm.

7. The method of welding a superalloy drum rotor assembly according to claim 1, wherein: in the third step, the technological parameters of the tack welding are as follows: uniformly and symmetrically positioning 8 sections of each welding line circumference, wherein the length of each section is 140 mm;

acceleration voltage: the pressure of the mixture is 150Kv,

welding current: 2.0 to 6.0mA, and a control circuit,

focusing current: 2000 to 2300mA, and a first electrode,

welding speed: 10 to 30mm/s of the total amount of the carbon fiber,

waveform: the straight line is a straight line,

distance between the workpiece and the welding gun: 300-700 mm.

8. The method of welding a superalloy drum rotor assembly according to claim 1, wherein: and after the electron beam welding, performing machining treatment on the front side of the welding seam.