Method and device for checking shaft weld joint by fitting takeup device in shaft through bore and appropriate rotor shaft

FIELD: process engineering.

SUBSTANCE: invention relates to production of shaft for turbine and/or generator by welding and to shaft thus made. Shaft element 5 of one central part side confining its circular surface relative to rotational axis 2 is removed to produce at least one exposed cavity 11 in at least one cylinder 3 in the limits of left tube-shape rib 13. Two shaft elements 5 are located and aligned along rotational axis 2 to make hollow cavity 15. First tubular seam 17 is produced by arc welding into narrow clearance. Through hole 18 is made outside of one of two shaft elements opened into said hollow space 15. Quality of said first seam 17 is estimated from inside of said hollows space 15 during or after welding with the help of radiation receiver 19 or radiation source 19a inserted via through hole 18 in hollow space 15t.

EFFECT: direct control over welding.

14 cl, 2 dwg

 

This invention relates to a method according to the generic concept of the main independent claim of the invention and the device according to the generic concept of additional independent claim.

For joint welding of the rotor shaft, in particular in turbine and generatorerror use of electric arc welding in a narrow gap to collect the prepared elements of the shaft in the rotor. Essential criteria of high quality education is the first circular tube seam, i.e. the so-called first weld surfacing or welding of the root pass, as the shape and the accuracy of the weld root can significantly affect the dynamic characteristics of the rotor. Cross-sectional center of the shaft elements dispersed, it means that the welding of the root forms a tubular annular seam. To verify the formation of the weld root, conduct in General x-ray examinations of weld joints of the total volume in individual segments, in order to control the quality. In some cases, the second x-ray is carried out after the welding of the root and stacking several additional welds.

Traditionally, the inspection carried out in such a way that the x-ray tube on one side is directed in the axial direction at the center of the ring. On the opposite side have sensitive the Yu radiation film, blackening which gives information about the quality of the weld. Depending on the thickness of the seam framework and rotor diameter must be approximately 8-20 segments of the image volume and duration of exposure of the image approximately 4-11 minutes. You must reduce the need for welding preheating of the rotor from approximately 100-170C to a temperature below 50C in order not to damage the material of the film. Phase formed during cooling and re-heating the remaining portion of the seam during the final welding, require a considerable investment of time, especially when large masses of the rotor.

The present invention is to improve a simple and effective way of quality first annular bead, the so-called first welded baffle or root welding with electric arc welding in a narrow gap elements of the shaft, in particular of the rotor shaft of the turbine and/or generator. In addition, the quality of the first tubular annular seam should be evaluated after and/or during welding.

The problem is solved by a method according to main independent claim of the invention and the device according to the additional independent claim.

According to the first aspect, a method for inspection of a welded joint shaft, in particular of the rotor shaft of the turbine and/or generator having the following the steps: producing at least two shaft elements, having at least one symmetrical about an axis of rotation coaxial along the axis of rotation of the cylinder and, respectively, two perpendicular to the axis of rotation of the main limiting circular surface; removing at least one side of the main limiting circular surfaces, respectively, one Central part of the corresponding element of the shaft with respect to the axis of rotation for receiving respectively one open cavity in at least one cylinder within the remaining tubular ribs; accommodation respectively two elements of the shaft along the axis of rotation coaxial to each other, and respectively two edges are adjacent to each other and respectively two cavities form a hollow space; in other words, make the connection of two elements of the shaft in a known manner through close interaction or install one in the other nodes, corresponding to the form of annular ribs machined face. Thus, connected to the shaft element forms through the annular rib of the hollow space in the center of the axis of the shaft; the manufacture of the first tubular annular weld for weld joint both edges by means of electric arc welding in a narrow gap, and in one of the two shaft elements perform a through hole from the outside into the hollow. The method differs, chooseco quality of the first tubular annular bead on the inside of the hollow space takes place during and/or after welding by means inserted through the through hole in the hollow space of the perceiving device or the radiation source.

The shaft elements have respectively two perpendicular axes of rotation of the main limiting circular surface. This is the basis and the end of the shaft element, which has at least one coaxially placed along the axis of rotation of the cylinder. This means that the base can be the basis of one of the cylinder element of the shaft, and the end may be the end of the other cylinder element shaft. If the shaft element has only one cylinder, the base and the end are the basis and the end of the cylinder. The first tubular ring seam is designated as the welding of the root pass.

In General, the edge is a protrusion of material.

According to the second aspect of the rotor shaft is produced, in particular for the turbine and/or generator to the invention by an appropriate method.

According to a third aspect of the receiving device or the source of radiation is administered to assess the quality of the first tubular annular bead on the inside of the hollow space during and/or after welding through a through hole in the hollow space.

For welding fabrication weld root is usually used axial hole of the rotor for lubricant under pressure from the inner side of the root weld with shielding gas. This hole can now also be used to introduce the recipient device or source is of the infrared radiation. However, selectively can be used separate or combined by way of the following effects: monitoring the inner side of the root of the weld during the welding process; visual monitoring and inspection of the education of the root of the weld after welding; x-ray control can be completely avoided, since the formation of the seam can be estimated directly. Avoid costly downtime during temperature changes with cooling and heating parts of the rotor. Fully welded prepared seams can be connected directly after the scan.

The following preferred embodiments of the invention discussed in conjunction with the dependent claims.

According to a preferred variant of the invention, the receiving device may be an optical perceiving device. When using an optical tracking device, for example, you can see the color during welding and/or the size of the melted metal. These values can advantageously be used to control the welding process.

According to the following preferred variant of the invention, the optical receiving device may be an endoscope or camera. When using the camcorder recording video signals for the electronic document image is available as confirm redeye quality.

According to the following preferred variant of the invention, the receiving device may be a device that perceives temperature, or an infrared camera. Thus, for example, the temperature of the welding can be used for metrological evaluation of root welding. Next, the temperature of the surface of the first annular bead may be logged and analyzed.

According to the following preferred variant of the invention, the welding can be adjusted by the recipient device during welding on the basis of registered parameters. Especially preferred parameters such as the size of oplaw annular seam, color circular seam welding temperature or the surface temperature of the weld. The welding temperature is the temperature of the welded ring seam from the side of the hollow space, since the opposite sides of the posted welding equipment.

According to the following preferred variant of the invention, it is possible to adjust the pulse current and/or voltage as a parameter of the welding of the welding installation. They are especially simple control options.

According to the following preferred variant of the invention, the regulation may exercise tvlatest automatically. Also serving entity welding installation may use a video manually to regulate the welding process. According to this invention it is possible to choose to use a separate or combined by way of the following steps: monitoring the inner side of the root of the weld during the welding process; visual monitoring and inspection of the education of the root of the weld after welding; automatic online control of welding parameters for optimal formation of the weld root, for example, measuring the technical evaluation of welding temperature. Thus, particularly preferred adjustable to ensure a high quality regardless of the service.

According to the following preferred variant of the invention, the radiation source may be an x-ray tube or isotope radiation source. If the radiation source is an x-ray tube, the x-ray control of the quality of root welding can be done from the inside out. This should be visible only wall ribs. Thus, it is possible to spend less energy on the x-ray control unlike conventional x-ray control. In addition, the quality of x-ray images clearly really improved.

According to the following preferred variant of the embodiment of the invention the through hole can be made by drilling along the axis of rotation of the shaft element with an open cavity with an open side of the cavity.

According to the following preferred variant of the invention, the through hole can be made through alternative drilling along the axis of rotation of the shaft by not having an open cavity.

According to the following preferred variant of the invention, the electric arc welding in a narrow gap may be arc welding with a consumable electrode in inert gas or welding consumable electrode in a protective gas.

The invention is described in more detail by means of embodiments in conjunction with the figures. Shown:

figure 1 is an example implementation of the rotor shaft with the hole and perceiving device.

figure 2 is an example of implementing the invention method.

Figure 1 shows an example implementation of the rotor shaft 1 with a through hole 18 and the receptive device 19 or 19a radiation. As a rule, any shafts or axes of this type covered by this invention. The preferred embodiment are the shafts of the rotors of the turbine and/or generator. Figure 1 shows the elements of the shaft 5, which are respectively two perpendicular relative to the axis of rotation 2 main limiting circular surface 7. The elements 5 of the shaft of assymmetric relative to the axis of rotation 2 and have at IU is e one located coaxially to the axis of rotation 2 of the cylinder 3. This cylindrical symmetry should provide optimal process sequence with the rotation of the rotor shaft 1. The main limiting circular surfaces 7 are the base and the end face of the cylinder 3 or the base of the butt and the two different cylinders 3. At least one side of the main limiting circular surface were removed, respectively, one Central part of the corresponding element 5 of the shaft around the axis of rotation 2. Thus, at least on one side of the main limiting circular surface of the shaft element 5 to form an open cavity 11. This open cavity 11 is formed in at least one of the cylinders 3. Around this open cavity 11 remains tubular rib 13. The rib 13 is limited to the remaining part of the main limiting circular surface 7. The inner and outer diameters adjacent to each other of the ribs 13 can be the same. According to a preferred variant of the elements of the shaft can be obtained by means of forging or stamping. As part of the elements of the shaft can be obtained by means of forging or stamping. According to another preferred variant of the destruction of the Central part may be made by grinding, in particular bore. Figure 1 shows the blank of the rotor shaft 1. Perhaps no other part of the finished shaft of the rotor 1. Figure 1 shows the harvesting of the rotor shaft 1, mainly placed in such a way that the axis of rotation 2 is directed vertically. Thus, the elements 5 of the shaft can simply be placed one after the other and welded to each other. The rotor shaft 1 in the collection is made by welding element 5A of the shaft from the top of the shaft element 5. For this purpose, respectively, the two elements 5 of the shaft, otherwise 5 and 5a, are placed coaxially one behind the other along the vertical axis of rotation 2. Consequently two ribs 13 are adjacent to each other remaining parts, which belong to both a major limiting circular surfaces 7, and consequently, the two cavity 11 to form a closed hollow space 15. The circle on the right top of figure 1 depicts the area of the two adjacent ribs 13. In the inner region of the ribs 13 of the first tubular annular bead 17, which is denoted as the welding of the root pass, by means of electric arc welding in a narrow gap. Both are located opposite each other, the ribs 13 are connected by welding, and is the first tubular annular bead 17. This is shown below in figure 1 in an enlarged view. The first tubular annular bead 17 is located on the left inner side of both edges 13. As arc welding in a narrow gap is particularly suitable electric arc welding is a narrow gap TIG inert gas. Other methods of welding in shielding gas is also possible. Means formed in one of the two adjacent elements 5 of the shaft through holes 18, you can enter a protective gas in the hollow space 15. According to figure 1 in the top 5 of the shaft by drilling along the axis of rotation 2 with the open side of the cavity 11 is manufactured through hole 18. Figure 1 shows introduced through the through hole 18 from the outside into the hollow space 15 of the receiving device 19 or the source 19a radiation. Through such a receptive device 19 or source 19a radiation can be estimated quality of the first tubular annular bead 17 within the hollow space 15 during and/or after welding. While perceiving device 19 may be optical perceiving device. As an optical tracking device is suitable, in particular, an endoscope or camera. Thus, it is possible to observe the welding process in the production of the first tubular annular bead 17 and the inner side of the root, i.e. to cover the inner side of the first tubular annular bead 17 during the welding process. Then there is the possibility to carry out visual inspection and examination of the first tubular annular bead 17 after welding. By means of an optical data recording can is about, for example, to estimate the size of oplaw or its color. Further, it is an alternative by manual regulation of the nursing person, that is, a welder, the possibility of automatic control of welding parameters for optimal formation of the first tubular annular bead 17 during the welding process. For example, you metrologically to estimate the temperature welding. Through regulation, for example, on the basis of temperature measurements, it is possible to adjust the pulse current welding equipment. Thus, the first tubular annular bead 17 can effectively be improved. Then perhaps after welding to place the source 19a radiation, such as x-ray device or the irradiator isotopes in the hollow space 15. However, it is possible to carry out conventional radiographic testing of the first tubular annular bead 17. Radiographic inspection from the inside makes it possible to light only part of the first tubular annular bead 17, which is represented in figure 1 within the circle. Inside you Shine x-rays, only the wall of the two welded ribs 13. Thus, conventional x-rays is enhanced by the fact that it requires less amount of energy, and improves the quality of the radiographs. The welding parameters can be, for example, an electric voltage with the arch welding equipment. A through hole 18 alternative can be made by drilling along the axis of rotation 2 of the element 5A of the shaft on the side without the cavity. This is presented in figure 1 below the top of the image.

Figure 2 shows an example of implementing the invention method. Joint welding of the shaft, in particular for the turbine and/or generator should be properly checked. At step S1 the manufacture of at least two shaft elements having at least one symmetrical about an axis of rotation coaxial along the axis of rotation of the cylinder and, respectively, two perpendicular to the axis of rotation of the main limiting circular surface. At step S2 carry out the removal of at least one side of the main limiting circular surfaces, respectively, one Central part of the corresponding element of the shaft with respect to the axis of rotation for receiving respectively one open cavity in at least one cylinder within the remaining tubular ribs. Ends in step S3 placing respectively two elements of the shaft along the axis of rotation coaxial to each other, and respectively two edges are adjacent to each other and respectively two cavities form a hollow space. At step S4, the manufacture of the first tubular ring is the first of the weld for weld joint both edges by means of electric arc welding in a narrow gap, and in one of the two shaft elements perform a through hole from the outside into the hollow. At step S5 assess the quality of the first tubular annular bead on the inside of the hollow space during and/or after welding by means inserted through the through hole in the hollow space of the recipient device or a radiation source.

1. A method of manufacturing a shaft (1), in particular for the turbine and/or generator, by means of a welded joint, comprising the steps
- production of at least two elements (5) of the shaft, symmetrical with respect to the axis of rotation (2) and having at least one coaxial along the axis of rotation (2) cylinder (3), respectively, and two perpendicular to the axis of rotation of the main limiting circular surface (7);
- removal of at least one side of the main limiting circular surfaces, respectively, one Central part of the corresponding element (5) of the shaft about the rotation axis (2) for receiving respectively one open cavity (11) in at least one cylinder (3) within the remaining tubular ribs (13);
- accommodation respectively two elements (5) of the shaft along the axis of rotation (2) coaxial to each other, and respectively two ribs (13) are adjacent to each other and respectively two cavity (11) form a hollow space is (15);
- manufacture of the first tubular ring joint (17) for welded joints of both edges (13) by means of electric arc welding in a narrow gap, and in one of the two elements (5) of the shaft perform a through hole (18) outside in the hollow space (15);
- quality assessment of the first tubular ring joint (17) inside the hollow space (15) during and/or after welding by means inserted through the through hole (18) in the hollow space (15) of the recipient device (19) or source (19a) radiation, and
a through hole (18) is performed by drilling along the axis of rotation (2) through item (5) of the shaft.

2. The method according to claim 1, characterized in that the drilling is performed through item (5) of the shaft with an open cavity (11) with the open side of the cavity (11).

3. The method according to claim 1, characterized in that the drilling is performed through item (5) of the shaft from the side, without having a cavity (11).

4. The method according to one of claims 1, 2 or 3, characterized in that the perceiving device (19) is the optical receiving device.

5. The method according to claim 4, characterized in that the optical perceiving device is an endoscope or camera.

6. The method according to claim 1, characterized in that the perceiving device (19) is an infrared camera.

7. The method according to one of claims 1, 2 or 3, characterized in that the welding shall govern through the m perceiving device (19) during welding on the basis of registered parameters.

8. The method according to claim 7, characterized in that the welding regulate based on the sizes of surface melting.

9. The method according to claim 7, characterized in that the welding regulate on the basis of the welding temperature.

10. The method according to claim 7, characterized in that regulate the pulse current and/or voltage as welding parameters welding equipment.

11. The method according to claim 7, characterized in that the regulation is carried out automatically.

12. The method according to one of claims 1, 2 or 3, characterized in that the source (19a) radiation is an x-ray machine or an isotope source.

13. The method according to claim 1, characterized in that the electric arc welding in a narrow gap is electric arc welding in a narrow gap with non-consumable electrode in inert gas or welding consumable electrode in a protective gas.

14. The rotor shaft, in particular for the turbine and/or generator, characterized in that the shaft (1) is manufactured by the method according to one of the preceding paragraphs.



 

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3 dwg

FIELD: investigating or analyzing of materials.

SUBSTANCE: method comprises determining the number of failed articles, density distribution function of time to failure, and intensity of failures from criteria of defect presence, or leakage, or failure before operation without preliminary tests or without preliminary operation of the article.

EFFECT: improved method.

2cl, 5dwg

FIELD: machine building.

SUBSTANCE: segmented turbine rotor includes multiple rows of turbine blades and multiple rotor segments. The latter include the first rotor segment connected to the second rotor segment in joint. Joint includes different materials from each of the first and the second rotor segments. Each of the first and the second rotor segments includes material chosen from the group consisting of superalloy, martensitic stainless steel, low-alloy steel and titanium alloy. The first rotor segment of multiple rotor segments of segmented turbine rotor includes annular rotor segment having an axis that is actually parallel to central rotor axis. Annular rotor segment forms a cavity located in its centre and has outer surface supporting more than one row of multiple rows of turbine blades. Section of partition wall has the first end and the second end. The first end is located near central rotor axis. Flanged section is made as an integral part of the second end of partition wall section. Flanged section is located parallel to central axis, thus forming a cavity located between partition wall section and flanged section. Annular rotor segment has no partition wall section passing inwards radially, thus forming concentric cover. Besides, subject of invention is turbine containing external frame and above described segmented turbine rotor located inside external frame.

EFFECT: invention allows reducing weight of segmented rotor.

7 cl, 5 dwg

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