Patent Application
20140263577
The subject matter disclosed herein relates to joining methods and temperature controlled fluid treating systems and, more specifically, to joining methods and temperature controlled fluid treating systems for controlling temperature profiles of articles.
In gas turbine engines, such as aircraft engines for example, air is drawn into the front of the engine, compressed by a shaft-mounted rotary-type compressor, and mixed with fuel. The mixture is burned, and the hot exhaust gases are passed through a turbine mounted on a shaft. The flow of gas turns the turbine, which turns the shaft and drives the compressor and fan. The hot exhaust gases flow from the back of the engine, driving it and the aircraft forward.
During operation of gas turbine engines, the temperatures of combustion gases may exceed 3,000° F., considerably higher than the melting temperatures of the metal parts of the engine which are in contact with these gases. Operation of these engines at gas temperatures that are above the metal part melting temperatures is a well-established art, and depends in part on supplying a cooling air to the outer surfaces of the metal parts through various methods. The metal parts of these engines that are particularly subject to high temperatures, and thus require particular attention with respect to cooling, are the metal parts forming combustors and parts located aft of the combustor, in the so-called “hot gas path”. For example, the operating temperatures can be partially regulated by using passageways such as cooling holes incorporated into some engine components.
Superalloys, such as precipitation-hardenable Ni-based superalloys, or Co-based superalloys, can be used for turbine components to help withstand higher operating temperatures. However, the repair of these materials and components may also require significant resources such as to properly preheat and/or cool weld repair sites. Moreover, the large size of these components can also prevent some preheating devices (e.g., induction heaters) from effectively preheating the necessary area. As a result, the preheating, cooling and any other temperature cycling can thus require additional resources and time to allow for sufficient joining of additional material for modifications or repairs.
Accordingly, alternative joining methods and temperature controlled fluid treating systems would be welcomed in the art.
In one embodiment a method is disclosed of joining material to an article comprising one or more passageways. The method includes fluidly connecting a temperature controlled fluid source comprising temperature controlled fluid to at least one passageway and passing the temperature controlled fluid through the at least one passageway, wherein the temperature controlled fluid at least partially controls a temperature profile of the article. The method further includes joining material to the article, wherein the temperature profile of the article at least partially controls a resulting joined material characteristic.
In another embodiment, a temperature controlled fluid treating system is disclosed for joining material to an article comprising one or more passageways. The temperature controlled fluid treating system includes a temperature controlled fluid source that fluidly connects to at least one passageway of the article and passes a temperature controlled fluid through the passageway, wherein the temperature controlled fluid at least partially controls a temperature profile of the article. The temperature controlled fluid treating system further includes a material joining apparatus that joins material to the article, wherein the temperature profile of the article at least partially controls a joined material characteristic.
These and additional features provided by the embodiments discussed herein will be more fully understood in view of the following detailed description, in conjunction with the drawings.
The embodiments set forth in the drawings are illustrative and exemplary in nature and not intended to limit the inventions defined by the claims. The following detailed description of the illustrative embodiments can be understood when read in conjunction with the following drawings, where like structure is indicated with like reference numerals and in which:
One or more specific embodiments of the present invention will be described below. In an effort to provide a concise description of these embodiments, all features of an actual implementation may not be described in the specification. It should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions must be made to achieve the developers' specific goals, such as compliance with system-related and business-related constraints, which may vary from one implementation to another. Moreover, it should be appreciated that such a development effort might be complex and time consuming, but would nevertheless be a routine undertaking of design, fabrication, and manufacture for those of ordinary skill having the benefit of this disclosure.
When introducing elements of various embodiments of the present invention, the articles “a,” “an,” “the,” and “said” are intended to mean that there are one or more of the elements. The terms “comprising,” “including,” and “having” are intended to be inclusive and mean that there may be additional elements other than the listed elements. Temperature controlled fluid treating systems disclosed herein generally comprise a temperature controlled fluid source and a material joining apparatus to join material to the target location of an article comprising passageways. In addition to the material joining apparatus joining material to the target location, temperature controlled fluid is fluidly connected to the passageways and passed there through to at least partially control the temperature profile of the article, which in turn at least partially controls a characteristic (e.g., microstructure) of the joined material. As used herein, “joined material” may refer to the article itself or to material added to the article, such as, for example, welding material. Temperature controlled fluid treating systems and methods of joining material to an article will be discussed in more detail herein.
Referring now to
The article 10 can have a temperature profile that comprises the specific temperature at each respective location on and about the article 10. As will become appreciated herein, the temperature profile can vary with respect to location and can depend on a variety of factors such as external temperatures, the temperature of the joined material and the like. Specifically, the temperature profile can also depend at least in part on the temperature of the temperature controlled fluid that passes through the passageways 12.
The article 10 comprises one or more passageways 12 passing at least partially through the article 10. For example, in some embodiments, the one or more passageways 12 pass from a first end 18 to a second end 19. However, in other embodiments (not illustrated), the one or more passageways 12 may pass from a first end 18, serpentine through a portion of the article 10 and then exit back through the first end 18 without breaching the second end 19. The passageways 12 can thus comprise any passage that at least partially passes through the article 10 and can allow for temperature controlled fluid 35 that passes there through to at least partially control the temperature profile of the article 10 as will become appreciated herein. In some embodiments, such as when the article 10 comprises a turbine component, at least one of the one or more passageways 12 can comprise a cooling hole. As used herein, “cooling hole” refers to a passageway 12 that passes from a first end 18 to a second end 19 of the article 10 and that is used to help cool the article 10 during operation.
As best illustrated in
In some embodiments, the article 10 may be disposed on a support stand 15 prior to or during the joining of material as will become appreciated herein. The support stand 15 may be stationary or mobile (e.g., rotatable) and position the article 10 relative to the material joining apparatus 20 and the temperature controlled fluid source 30 when joining material to the target location 11 of the article 10.
Still referring to
The material joining apparatus 20 may be disposed at any position relative to the article 10 that allows for joining material to the target location 11. For example, as illustrated in
Referring still to
In one embodiment, such as that illustrated in
For example, referring now to
The temperature controlled fluid 35 can comprise any medium that can pass through the passageway 12 at a controlled temperature and/or a controlled pressure. The temperature controlled fluid 35 may be heated or cooled through any suitable means prior to passing through the at least one passageway 12. For example, in some embodiments, the temperature controlled fluid 35 may be heated by passing through or near an induction coil, flame, or other heating source. Alternatively, the temperature controlled fluid 35 may be cooled by passing through or near a chiller, liquid nitrogen or other suitable cooling source. In some embodiments, the temperature controlled fluid 35 may comprise a plurality of fluids, at least one of which is temperature controlled. For example, a heated (or cooled) fluid may be mixed with a room temperature fluid at a rate that achieves a final target temperature.
In some embodiments, the temperature controlled fluid 35 may comprise one or more gasses such as an inert gas, e.g. Argon. While specific embodiments of temperature controlled fluid 35 have been presented herein, it should be appreciated that additional and alternative temperature controlled fluids 35 may also be realized. In some embodiments, the type of temperature controlled fluid 35 may be selected in part on its thermal transfer characteristics with the article 10.
Still referring to
For example, one temperature controlled fluid parameter is the temperature of the temperature controlled fluid 35. By increasing or decreasing the temperature of the temperature controlled fluid 35, the temperature profile of article 10 can also increase or decrease respectively. In such embodiments, the controller 50 may increase or decrease the temperature by communicating with heating and/or cooling sources or by adjusting the resident time of the temperature controlled fluid 35 as it passes through those heating and/or cooling sources. Another temperature controlled fluid parameter is the pressure of the temperature controlled fluid 35. For example, by increasing the pressure, the temperature controlled fluid 35 may pass through the passageway 12 at a faster rate thereby changing its effect on the temperature profile of the article 10. In such embodiments, the controller 50 may increase or decrease the pressure and/or flow rate by communicating with a compressor, flow rate valves, or other device that controls the flow of the temperature controlled fluid 35. While specific temperature controlled fluid parameters (and methods of changing the same) have been presented herein, it should be appreciated that these are exemplary only and any other suitable parameter may additionally or alternatively be incorporated.
In some embodiments, the temperature controlled fluid treating system 100 may comprise one or more temperatures sensors 51. For example, as illustrated in
The article temperature sensor 51 and the joined material temperature sensor 52 can comprise any suitable device for measuring the temperature at one or more locations about the article 10 and the joined material 22 respectively. For example, the article temperature sensor 51 and/or the joined material temperature sensor 52 can comprise a thermocouple, infrared thermometer, or the like.
In operation, the temperature controlled fluid source 30 thereby passes the temperature controlled fluid 35 through the at least one passageway 12. The temperature controlled fluid 35 thereby at least partially controls the temperature profile of the article 10 by heating or cooling one or more locations. Likewise, the material joining apparatus 20 joins the joined material 22 to the target location 11. It should be appreciated that these events can occur simultaneously or in any sequence.
The joined material 22 will subsequently cool or otherwise stabilize to form its final microstructure. However, during said cooling or other stabilization, the microstructure of the joined material 22 will be at least partially controlled by the temperature profile of the article 10. Accordingly, the temperature controlled fluid 35 can assist in the production of a quality joined material 22 by controlling the temperature profile of the article 10 throughout the joining process thereby controlling a joined material characteristic. As used herein, “joined material characteristic” refers to any mechanical and/or chemical property of the resulting joined material (e.g., the article, weld, braze, etc.) such as microstructure, finish, quality or the like. For example, by controlling the joined material microstructure, the joined material's ductility, toughness or the like can be controlled so that the resulting joined material has properties tailored for the particular material and/or application.
Furthermore, the article 10 may be maintained at an elevated temperature to avoid larger temperature differences with the joined material 22, may be maintained at a lower temperature to promote faster cooling of the new joined material 22, or may be cycled between different temperatures depending on the demands of a particular joining application include for the perseveration of the article's microstructure.
For example, if the joining process brings about an excess amount of heat, the temperature controlled fluid 35 may be cooled while it is passed through one or more passageways 12 to subsequently cool the article 10. This may prevent overheating and reduce or eliminate the need to cycle the joining application. Conversely, if the joining application requires an elevated temperature that is not inherently provided by the material joining apparatus 20, the temperature controlled fluid 35 may be heated while it is passed through one or more passageways 12 to subsequently heat the article 10 before and/or during joining. In even some embodiments when the material joining apparatus 20 comprises a welder, the temperature controlled fluid 35 may additionally shield one or more portions of the article 10 from the welder to prevent or limit the change in the article's properties as a result of the utilization of the welder. For example, the temperature controlled fluid 35 may comprise an inert gas such as Argon so that it would prevent oxidation of the molten surfaces during the joining operation.
Referring now to
The method 300 further comprises passing the temperature controlled fluid 35 through the at least one passageway 12 in step 320. As a result of its relatively elevated or reduced temperature, the temperature controlled fluid 35 will at least partially control the temperature profile of the article 10. While, before or after the temperature controlled fluid 35 is passed through the at least one passageway 12 in step 320, the target location 11 of the article 10 has material joined thereto in step 330. Furthermore, the temperature profile of the article 10 (which is at least partially controlled by the temperature controlled fluid 35 passing through the at least one passageway 12 in step 320) at least partially controls the microstructure of the joined material 22 (e.g., the microstructure of the article 10, weld material 25, etc.).
In some embodiments, the method 300 may further comprise monitoring the temperature profile of the article 10 in step 325 and/or monitoring the temperature profile of the joined material in step 335. The monitoring of said temperature profiles in steps 325 and/or 335 may then be utilized when controlling at least one temperature controlled fluid parameter in step 315. The method 300 may then continue until the joined material 22 is completely applied to the article 10 such that the temperature profile of the article 10 no longer needs to be at least partially controlled by the temperature controlled fluid 35 passing through the at least one passageway 12. By joining material in step 330 before, during or after (or combinations thereof) passing through temperature controlled fluid 35 in step 320, the temperature controlled fluid 35 can be used to preheat the article 10 before joining material in step 330, maintain the temperature of the article 10 in a certain range while joining material in step 330, and/or cool down the article 10 after joining material in step 330.
It should now be appreciated that temperature controlled fluid treating systems may be used to at least partially control the temperature profile of an article while material is joined thereto. This can thereby increase the process control of joining material and subsequent joined material yield rates. Moreover, dynamically controlling the temperature profile of the article through temperature controlled fluid can reduce process time by eliminating necessary cooling/rest periods and maintain or improve the overall quality of the final article.
While the invention has been described in detail in connection with only a limited number of embodiments, it should be readily understood that the invention is not limited to such disclosed embodiments. Rather, the invention can be modified to incorporate any number of variations, alterations, substitutions or equivalent arrangements not heretofore described, but which are commensurate with the spirit and scope of the invention. Additionally, while various embodiments of the invention have been described, it is to be understood that aspects of the invention may include only some of the described embodiments. Accordingly, the invention is not to be seen as limited by the foregoing description, but is only limited by the scope of the appended claims.
