Welding method for a turbine head assembly

Abstract

The application discloses a welding method for a turbine head assembly. The welding method for the turbine head assembly comprises adjusting a welding space for processing the turbine head assembly to preset conditions; and continuously welding a welding area surrounding the turbine head and the rotating shaft. The turbine head assembly comprises the turbine head and the rotating shaft. The application adjusts the welding space of the turbine head assembly and continuously welds the welding area, thereby avoiding the deviation of the turbine head caused by the traditional four-point welding method, improving the welding precision under the premise of ensuring the stable connection of the turbine head and the rotating shaft, and further improving the welding quality of the turbine head assembly.

Description

Technical Field

[0001] This invention relates to the field of parts processing, and in particular to a welding method for turbine head assemblies. Background Technology

[0002] With technological advancements and economic development, high-speed rotor machinery is increasingly widely used in engineering applications. The mass production process for many turbocharger core components, the "turbine shaft," utilizes electro-welding to combine the "turbine head" and "rotary shaft" into one main component. In existing welding processes, the first half uses four-point low-current welding to fix the two connecting bodies, the "turbine head" and "rotary shaft," while the second half uses continuous high-current welding to complete the final electro-welding process. However, four-point low-current welding often results in uneven stress on the workpiece, causing the turbine head to shift and leading to significant waste. Summary of the Invention

[0003] This invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one object of this invention is to provide a welding method for turbine head assemblies. By adjusting the welding space of the turbine head assembly and performing continuous welding in the welding area, this invention avoids the misalignment phenomenon caused by the traditional four-point welding method for the turbine head. While ensuring a stable connection between the turbine head and the shaft, it improves the welding precision, thereby improving the welding quality of the turbine head assembly.

[0004] The welding method for a turbine head assembly according to the present invention includes adjusting the welding space for machining the turbine head assembly to preset conditions; and continuously welding the welding area surrounding the turbine head and the shaft. The turbine head assembly includes a turbine head and a shaft.

[0005] The welding method for turbine head assemblies according to the present invention first adjusts the welding space for processing the turbine head assembly to preset conditions, which can be understood as a suitable welding environment, such as a vacuum environment. Secondly, continuous welding is performed on the welding area where the turbine head and the shaft are fitted together, fixing the turbine head to the shaft. This continuous welding improves the stability of the fit between the turbine head and the shaft. Furthermore, compared to four-point welding or other types of welding methods in the prior art, continuous welding can use lower current and apply less force to the mating position of the shaft and the turbine head, minimizing the impact on the welding area and preventing the turbine head from shifting due to force. This improves the welding accuracy between the turbine head and the shaft, thereby improving the finished quality of the turbine head assembly.

[0006] According to one embodiment of the present invention, the continuous welding of the welding area surrounding the turbine head and the shaft includes performing a first welding of the welding area and a second welding of the welding area, wherein the current gradually increases during the first welding process and the current remains constant during the second welding.

[0007] According to one embodiment of the present invention, the angle between the starting point and the ending point of the first weld and the center of the weld area is α1 and satisfies: 300°≤α1≤400°.

[0008] According to one embodiment of the present invention, the starting current of the first welding is 0, the ending current of the first welding is I1, and satisfies: 1.5A≤I1≤2.5A.

[0009] According to one embodiment of the present invention, the angle between the starting point of the second welding and the ending point of the second welding and the center of the welding area is α2 and satisfies: 300°≤α2≤400°.

[0010] According to one embodiment of the present invention, the current of the second welding is constant at I2, and satisfies: 1.5A≤I2≤2.5A.

[0011] According to one embodiment of the present invention, the continuous welding of the welding area surrounding the turbine head and the shaft further includes performing a second welding on the welding area and then performing a third welding on the welding area, wherein the current of the third welding is gradually reduced.

[0012] According to one embodiment of the present invention, the angle between the starting point and the ending point of the third welding and the center of the welding area is α3 and satisfies: 450°≤α3≤550°.

[0013] According to one embodiment of the present invention, the current at the starting point of the third welding is I3, the current at the ending point of the third welding is 0, and the condition 1.5A≤I3≤2.5A is met.

[0014] According to one embodiment of the present invention, the welding method for the turbine head assembly further includes performing continuous welding on the welding area and then performing reinforcement welding and tempering on the welding area, wherein the current of the reinforcement welding is constant at I4 and satisfies: 8.5A≤I4≤9.5A.

[0015] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0017] Figure 1 This is a process flow diagram of a welding method for a turbine head assembly according to an embodiment of the present invention;

[0018] Figure 2 This is a structural diagram of a turbine head assembly according to an embodiment of the present invention.

[0019] Figure label:

[0020] Turbine head assembly 2;

[0021] Turbine head 21, shaft 22, welding area 23. Detailed Implementation

[0022] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0023] With technological advancements and economic development, high-speed rotor machinery is increasingly widely used in engineering applications. The mass production process for many turbocharger core components, the "turbine shaft," utilizes electro-welding to combine the "turbine head" and "rotary shaft" into one main component. In existing welding processes, the first half uses four-point low-current welding to fix the two connecting bodies, the "turbine head" and "rotary shaft," while the second half uses continuous high-current welding to complete the final electro-welding process. However, four-point low-current welding often results in uneven stress on the workpiece, causing the turbine head to shift and leading to significant waste.

[0024] The following is for reference. Figures 1-2 A welding method for a turbine head assembly according to an embodiment of the present invention is described.

[0025] The welding method for a turbine head assembly 2 according to the present invention includes adjusting the welding space for machining the turbine head assembly 2 to preset conditions; and continuously welding the welding area 23 surrounding the turbine head 21 and the shaft 22. The turbine head assembly 2 includes a turbine head 21 and a shaft 22.

[0026] The welding method for turbine head assembly 2 according to the present invention first adjusts the welding space for processing turbine head assembly 2 to preset conditions, which can be understood as a suitable welding environment, such as a vacuum environment. Secondly, continuous welding is performed on the welding area 23 after the turbine head 21 and the rotating shaft 22 are mated, fixing the turbine head 21 to the rotating shaft 22. This continuous welding improves the stability of the mating between the turbine head 21 and the rotating shaft 22. Furthermore, compared to four-point welding or other types of welding methods in the prior art, continuous welding can use lower current and apply less force to the mating position of the rotating shaft 22 and the turbine head 21, minimizing the impact on the welding area 23. This avoids the turbine head 21 shifting due to force, improves the welding accuracy between the turbine head 21 and the rotating shaft 22, and thus improves the finished quality of the turbine head assembly 2.

[0027] According to one embodiment of the present invention, the continuous welding of the welding area 23 surrounding the turbine head 21 and the rotating shaft 22 includes performing a first welding and a second welding of the welding area 23. During the first welding process, the current gradually increases; during the second welding, the current remains constant. Specifically, during the first welding of the welding area 23, the current gradually increases, and the force on the turbine head 21 also gradually increases. Compared to directly experiencing a large force, gradually increasing the current ensures the stability of the turbine head 21 and improves the fitting accuracy between the turbine head 21 and the rotating shaft 22. Although the increased current increases the force on the turbine head 21, since the turbine head 21 and the rotating shaft 22 are already welded together, the increased current will not affect the position of the turbine head 21. Furthermore, performing the second welding after the first welding, and using a constant current in the second welding, can further strengthen the connection between the turbine head 21 and the rotating shaft 22.

[0028] According to one embodiment of the present invention, the angle between the starting point and the ending point of the first weld and the center of the welding area 23 is α1, satisfying: 300°≤α1≤400°. Specifically, the starting point of the first weld can be understood as the position where the current is applied to the turbine assembly during the first weld process; similarly, the ending point of the first weld can be understood as the position where the current leaves the turbine assembly during the first weld process. During the first weld process, the angle between the starting point and the ending point of the first weld and the center of the welding area 23 is α1, satisfying: 300°≤α1≤400°. In actual operation, α1 can usually be 360°. This can also be understood as the first weld process performing a complete circumference weld on the welding area 23, ensuring that every position of the welding area 23 is welded, thereby improving the stability of the connection between the turbine head 21 and the shaft 22.

[0029] According to one embodiment of the present invention, the starting current of the first welding is 0, and the ending current of the first welding is I1, satisfying: 1.5A ≤ I1 ≤ 2.5A. Specifically, during the first welding process, the starting current of the first welding is 0, and the ending current of the second welding is I1. Throughout the entire first welding process, the current change can generally be a steady increase; that is, during the first welding process, the current increases from 0 to I1, and the increase in current per unit time is the same. During the first welding process, I1 can be 2A. The steadily increasing current can avoid the phenomenon of deviation caused by excessive changes in the force on the turbine head 21, thus improving the accuracy of the first welding.

[0030] According to one embodiment of the present invention, the angle between the starting point and the ending point of the second welding and the center of the welding area 23 is α2, and satisfies: 300°≤α2≤400°. After the first welding is completed, a second welding can be performed on the welding area 23, and the angle between the starting point and the ending point of the second welding and the center of the welding area 23 is α2, and satisfies 300°≤α2≤400°. Here, α2 can typically be 360°. It can also be understood that the second welding process performs a complete circumference welding on the welding area 23, ensuring that every position of the welding area 23 can be welded, thereby improving the stability of the connection between the turbine head 21 and the shaft 22.

[0031] According to one embodiment of the present invention, the current for the second welding is constant at I2, and satisfies: 1.5A ≤ I2 ≤ 2.5A. Specifically, during the second welding process, the welding current is constant at I2, and satisfies 1.5A ≤ I2 ≤ 2.5A. Typically, I2 can be 2A. It is understood that I2 and I1 can be the same, which can reduce the current adjustment steps from the end of the first welding process to the start of the second welding process, saving time.

[0032] According to one embodiment of the present invention, continuous welding of the welding area 23 surrounding the turbine head 21 and the shaft 22 further includes performing a second welding on the welding area 23 and then performing a third welding on the welding area 23, wherein the current of the third welding is gradually reduced. The third welding is performed after the second welding, and the current during the third welding process is gradually reduced. Using a gradually decreasing current for the third welding can further strengthen the connection between the turbine head 21 and the shaft 22 while reducing the current adjustment steps after the third welding, saving time, and resulting in a low overall energy consumption and low cost.

[0033] According to one embodiment of the present invention, the angle between the starting point and the ending point of the third welding and the center of the welding area 23 is α3, and satisfies: 450°≤α3≤550°. Specifically, after the second welding is completed, a third welding can be performed on the welding area 23, and the angle between the starting point and the ending point of the third welding and the center of the welding area 23 is α3, and satisfies 450°≤α3≤550°, where α3 can typically be 500°. This can also be understood as the third welding process performing welding on the welding area 23 for more than one complete circle, ensuring that each position of the welding area 23 can be repeatedly welded at least once, further improving the connection strength between the turbine head 21 and the shaft 22.

[0034] According to one embodiment of the present invention, the current at the starting point of the third welding is I3, and the current at the ending point of the third welding is 0, satisfying 1.5A≤I3≤2.5A. Specifically, during the third welding process, the current at the starting point of the third welding is I3, and the current at the ending point of the second welding is 0. Throughout the entire third welding process, the current change can typically be a stable decrease; that is, during the third welding process, the current decreases from I3 to 0, and the decrease in current per unit time is the same. During the third welding process, I3 can be 2A. The stable decrease in current can prevent the turbine head 21 from shifting due to excessive force changes, thus improving the accuracy of the first welding. Simultaneously, at the end of the third welding process, the current drops to 0, allowing direct further operation on the welding area 23, reducing unnecessary current adjustment processes and improving the overall efficiency of the welding process.

[0035] According to one embodiment of the present invention, the welding method for the turbine head assembly 2 further includes performing continuous welding on the welding area 23, followed by reinforcing welding and tempering on the welding area 23. The current for the reinforcing welding is constant at I4, and satisfies: 8.5A ≤ I4 ≤ 9.5A. After the third welding is completed, reinforcing welding can be performed on the welding area 23. Specifically, the current for reinforcing welding is constant at I4, and satisfies: 8.5A ≤ I4 ≤ 9.5A. Typically, the current for reinforcing welding can be 9A. Compared to continuous welding, the current for reinforcing welding is larger, resulting in higher welding strength. Since the turbine head 21 and the shaft 22 have already undergone three welding processes during the reinforcing welding, the strength is sufficient, and there will be no displacement of the turbine head 21 due to excessive current during reinforcing welding. Performing reinforcing welding at this time can further improve the connection strength between the turbine head 21 and the shaft 22, preventing the turbine head 21 and the shaft 22 from detaching during use. Meanwhile, during the reinforcement welding process, the angles between the starting point and the ending point of the reinforcement welding and the center of the welding area 23 can be 360° to ensure that reinforcement welding can be performed at every position where the turbine head 21 connects to the shaft 22. Furthermore, after the reinforcement welding is completed, the turbine head assembly 2 can be tempered to further improve its strength and rigidity.

[0036] The following is a brief description of a specific embodiment of the present invention.

[0037] Welding methods for turbine head assemblies include:

[0038] S1: Fix the turbine head 21 and the shaft 22 and place them in the welding space;

[0039] S2: Adjust the welding space to achieve a vacuum environment, fix the turbine head 21 and the rotating shaft 22 on the corresponding fixtures and adjust them to a position that facilitates welding;

[0040] S3: Perform the first welding on welding area 23. In the first welding, the welding current can be gradually increased from 0 to 2A, and the welding range can be 360°, or it can be understood as welding a complete circle of area 23.

[0041] S4: After the first welding process is completed, the second welding is performed. The current in the second welding process can be kept constant at 2A, and the welding range can be the same as that in the first welding.

[0042] S5: After the second welding process is completed, the third welding is performed. The current in the third welding can be gradually reduced from 2A to 0. The welding range can be 500° or a complete circumference of the welding area 23.

[0043] S6: After the third welding process is completed, the welding area 23 is subjected to reinforcement welding and tempering operations in sequence. The current during the reinforcement welding process can be kept constant at 9A, and the welding range can be the entire circumference of the welding area 23.

[0044] S7: After cooling, turbine head assembly 2 can be removed and precision measurements or other operations can be performed on turbine head assembly 2.

[0045] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0046] In the description of this invention, "first feature" and "second feature" may include one or more of the features.

[0047] In the description of this invention, "a plurality of" means two or more.

[0048] In the description of this invention, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or it may include the first and second features not being in direct contact but being in contact through another feature between them.

[0049] In the description of this invention, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicating that the first feature is at a higher horizontal level than the second feature.

[0050] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0051] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A welding method for a turbine head assembly, the turbine head assembly comprising a turbine head and a shaft, characterized in that, The welding method includes: Adjust the welding space used for machining the turbine head assembly to the preset conditions; Continuous welding is performed on the welding area surrounding the turbine head and the shaft; wherein... The continuous welding of the welding area surrounding the turbine head and the shaft includes: A first welding is performed on the welding area. During the first welding process, the current gradually increases. The angle between the starting point and the ending point of the first welding and the center of the welding area is α1 and satisfies: 300°≤α1≤400°. The starting point current of the first welding is 0, and the ending point current of the first welding is I1 and satisfies: 1.5A≤I1≤2.5A. A second welding is performed on the welding area, and the current is kept constant during the second welding.

2. The welding method for a turbine head assembly according to claim 1, characterized in that, The angle between the starting point and the ending point of the second weld and the center of the weld area is α2, and satisfies: 300°≤α2≤400°.

3. The welding method for a turbine head assembly according to claim 2, characterized in that, The current for the second welding is constant at I2, and satisfies: 1.5A≤I2≤2.5A.

4. The welding method for a turbine head assembly according to claim 1, characterized in that, The continuous welding of the welding area surrounding the turbine head and the shaft also includes: After performing a second weld on the welding area, a third weld is performed on the welding area, and the current of the third weld is gradually reduced.

5. The welding method for a turbine head assembly according to claim 4, characterized in that, The angle between the starting point and the ending point of the third weld and the center of the weld area is α3, and satisfies: 450°≤α3≤550°.

6. The welding method for a turbine head assembly according to claim 5, characterized in that, The current at the starting point of the third weld is I3, and the current at the ending point of the third weld is 0, satisfying 1.5A≤I3≤2.5A.

7. The welding method for a turbine head assembly according to claim 1, characterized in that, Also includes: After continuous welding of the welding area, the welding area is reinforced by welding and tempering. The current of the reinforcement welding is constant at I4 and satisfies: 8.5A≤I4≤9.5A.

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