CN113977063B - Electromagnetic pulse welding method for wear-resistant alloy of blade shroud - Google Patents
Electromagnetic pulse welding method for wear-resistant alloy of blade shroud Download PDFInfo
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- CN113977063B CN113977063B CN202111607834.5A CN202111607834A CN113977063B CN 113977063 B CN113977063 B CN 113977063B CN 202111607834 A CN202111607834 A CN 202111607834A CN 113977063 B CN113977063 B CN 113977063B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/06—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating by means of high energy impulses, e.g. magnetic energy
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/06—Arrangements or circuits for starting the arc, e.g. by generating ignition voltage, or for stabilising the arc
- B23K9/067—Starting the arc
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Abstract
The invention relates to the technical field of turbine blade machining, in particular to an electromagnetic pulse welding method for a blade shroud wear-resistant alloy, which comprises the following steps: and processing a welding surface, and reserving an arc striking bulge on the welding surface. And (3) putting the wear-resistant alloy welding rod close to the arc striking bulge and putting the welding gun close to the arc striking bulge for striking an arc. After the arc is started, the wear-resistant alloy welding rod and the welding gun move along the welding surface at a constant speed, so that the molten wear-resistant alloy welding rod is attached to the surface of the molten welding surface. When welding starts, the welding gun is close to the arc striking bulge, and then electric arcs are generated between the welding gun and the arc striking bulge. The electric arc tends to be stable, and the welding gun and the wear-resistant alloy welding rod move along the welding surface synchronously, so that the welding action is completed. During the period from the start of arc striking to the stabilization of the arc, the arc striking protrusion is consumed and sinks. And then make the arch of striking consume, and then make the back of welding completion, the high the same of the position of striking with follow-up welded position, the effectual pit that avoids striking process transition to consume the work piece and lead to.
Description
Technical Field
The invention relates to the technical field of turbine blade machining, in particular to an electromagnetic pulse welding method for a wear-resistant alloy of a blade shroud.
Background
Turbine blades are core hot end components in aircraft engines and gas turbines, and are subject to operating conditions of high temperature, high stress, high rotational speed, environmental corrosion, and the like. With the development of aero-engines and gas turbine engines, the temperature of the front inlet of the turbine is continuously increased, single crystal turbine blades are widely used, the blade structure is more and more complex and finer, and the precision requirement is higher and higher.
The large and medium-sized aero-engines and the gas turbines mostly adopt a structure that a blade and a turbine disc are separated. The blades are assembled with the turbine disc by adopting a tenon tooth structure, and the clearance between adjacent blade shroud is generally between 0.1mm and 0.5 mm. During the operation of the aircraft engine and the gas turbine, the blade meshing surfaces are in contact, so that collision and friction of adjacent blade shrouds inevitably occur. Once the blade shroud deforms or wears due to collision and friction, the blade clearance is too large, so that the blade vibrates too much, the blade is easy to break, and the engine or the gas turbine is scrapped. Therefore, adjacent blade shrouds are generally spaced by high temperature wear resistant blocks.
In the prior art, the high-temperature wear-resistant block is generally processed in a welding mode. Specifically, arc striking is performed on the workpiece in an arc welding manner, and the welding wire and the welding part of the workpiece are melted together, so that the melted welding wire is attached to the surface of the workpiece. The cooled welding wire layer is the high-temperature wear-resistant block welded on the workpiece. This welding method has the following disadvantages: the welding site of the workpiece is generally planar. When welding starts, a welding gun performs arc striking on the surface of a workpiece, the arc is unstable at the moment, and the distance between the welding gun and the workpiece needs to be finely adjusted, so that the arc is stable. When the electric arc is stabilized, the electric arc moves along the surface of the workpiece, and the whole surface welding is completed. Although the time from arc striking to arc stabilization is short, the process still can cause the surface of the workpiece to be excessively melted, further pits are generated at the arc striking part, and further the size of the machined workpiece is reduced, and the qualified rate is low.
Disclosure of Invention
The invention aims to provide an electromagnetic pulse welding method for wear-resistant alloy of a blade shroud, which can effectively avoid the generation of pits during welding.
The embodiment of the invention is realized by the following technical scheme:
the electromagnetic pulse welding method for the wear-resistant alloy of the blade shroud comprises the following steps: processing a welding surface, and reserving an arc striking bulge on the welding surface; the wear-resistant alloy welding rod is close to the arc striking bulge, and the welding gun is close to the arc striking bulge to strike an arc; after the arc is started, the wear-resistant alloy welding rod and the welding gun move along the welding surface at a constant speed, so that the molten wear-resistant alloy welding rod is attached to the surface of the molten welding surface.
Further, the height of the arc striking protrusion relative to the welding surface is 0.3mm-0.5 mm.
Furthermore, the two opposite sides of the blade shroud are respectively a first side surface and a second side surface; the first side face and the second side face are matched with each other, so that after the blade crowns are combined, the first side faces of the blade crowns are attached to the second side faces of the adjacent blade crowns; the first side surface is provided with a V-shaped groove; one groove wall of the V-shaped groove is set as the welding surface; the arc striking bulge is close to the groove bottom of the V-shaped groove.
Furthermore, the second side surface is provided with a limiting tooth matched with the V-shaped groove; when the limiting teeth are accommodated in the V-shaped grooves, the outer walls of the limiting teeth are attached to the groove walls of the V-shaped grooves; and one side of the limiting tooth, which is attached to the welding surface of the V-shaped groove, is also provided with a welding surface.
Furthermore, the arc striking protrusion of the limiting tooth is close to the cusp of the limiting tooth.
Further, after the welding of the wear-resistant alloy welding rod is completed, the welding part is polished.
Further, the top of the arc striking protrusion of the limiting tooth is flush with the surface of the cusp.
Furthermore, the wear-resistant alloy welding rod is a Fe-Cr-Mo-B welding rod.
Further, the thickness of the blade shroud is 2mm-3 mm.
The technical scheme of the embodiment of the invention at least has the following advantages and beneficial effects:
according to the electromagnetic pulse welding method for the wear-resistant alloy of the blade shroud, the arc striking bulge is arranged before the welding surface is arranged. When welding starts, the welding gun is close to the arc striking bulge, and then electric arcs are generated between the welding gun and the arc striking bulge. Meanwhile, the clearance between the welding gun and the arc striking bulge is fast and stable, so that the electric arc tends to be stable. And finally, the welding gun and the wear-resistant alloy welding rod synchronously move along the welding surface, so that the welding action is completed. During the period from the start of arc striking to the stabilization of the arc, the arc striking protrusion is consumed and sinks. And then make this transient process just consume the striking arch, and then make the welding accomplish the back, the striking position is the same with the height at follow-up welded position, and the effectual pit that avoids striking process transition to consume the work piece and lead to improves the qualification rate of product.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic view of a tip shroud according to the present invention prior to welding;
FIG. 2 is a schematic view of the two tip shroud assemblies after welding.
Icon: 1-a first side face, 11-a V-shaped groove, 2-a second side face, 21-a limiting tooth, 3-a welding face, 4-an arc striking bulge, 5-a wear-resistant alloy layer and 6-a leaf crown.
Detailed Description
In order to make the objects, 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 with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are used, they are based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships usually placed when the products of this application are used, and are only used for convenience of describing the present invention and simplifying the description, but do 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 thus, should not be construed as limiting the present invention.
In the description of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" should be construed broadly and may include, for example, a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The embodiment is as follows:
as shown in fig. 1 and fig. 2, the invention provides an electromagnetic pulse welding method for a tip shroud wear-resistant alloy. In particular, the shroud to which the invention relates is a shroud 6 of a turbine rotor blade. The blades are assembled with the turbine disc by adopting a tenon tooth structure, and the clearance between adjacent blade shrouds 6 is generally between 0.1mm and 0.5 mm. During operation of the engine, the shrouds 6 of two adjacent blades rub against each other. The mutual friction parts between two adjacent blade shrouds 6 need to be welded with wear-resistant alloy.
The welding method of the wear-resistant alloy comprises the following steps: firstly, a welding surface 3 is processed, and an arc striking bulge 4 is reserved on the welding surface 3. Specifically, the welding surface 3 is located at a portion where two adjacent tip shrouds 6 rub against each other. This portion is planar and has a width corresponding to the thickness of the tip shroud 6, typically 2mm to 3 mm. The arc ignition protrusion 4 is a convex portion of the welding face 3. After the arc striking bulge 4 is machined, the wear-resistant alloy welding rod is close to the arc striking bulge 4, and a welding gun is close to the arc striking bulge 4 to strike an arc. At the initial stage of arc striking, the arc is unstable because the distance between the welding gun and the arc striking projection 4 is not appropriate. At this time, the distance between the welding gun and the arc striking protrusion 4 is rapidly adjusted, so that the arc tends to be stable. After the electric arc is stabilized, the wear-resistant alloy welding rod and the welding gun move at a constant speed along the welding surface 3, so that the molten wear-resistant alloy welding rod is attached to the surface of the molten welding surface 3. And a layer of wear-resistant alloy can be covered on the surface of the workpiece after the molten wear-resistant alloy welding rod is cooled. Specifically, the wear-resistant alloy welding rod is a Fe-Cr-Mo-B welding rod.
According to the electromagnetic pulse welding method for the wear-resistant alloy of the blade shroud, the arc striking bulge 4 is arranged before the welding surface 3 is arranged. When welding starts, the welding gun firstly approaches the arc striking protrusion 4, and then electric arcs are generated between the welding gun and the arc striking protrusion 4. Meanwhile, the clearance between the welding gun and the arc striking protrusion 4 is fast and stable, so that the electric arc tends to be stable. And finally, the welding gun and the wear-resistant alloy welding rod synchronously move along the welding surface 3, so that the welding action is completed. During the period from the start of arc ignition to the stabilization of the arc, the arc ignition protrusion 4 is consumed and sags. And then make this transient process just consume striking arch 4, and then make the welding accomplish the back, the striking position is the same with the height at follow-up welded position, and the effectual pit that avoids striking process transition to consume the work piece and lead to improves the qualification rate of product.
In the present embodiment, the height of the arc initiating projection 4 with respect to the welding surface 3 is 0.3mm to 0.5 mm. In practice, the process of arc stabilization is fast, consuming about 0.3mm to 0.5mm of the workpiece. The height of the arc striking protrusion 4 relative to the welding surface 3 is set to be 0.3mm-0.5mm, so that the welding surface 3 is flat after the arc striking protrusion 4 is consumed. Thereby ensuring that the subsequent welding part and the arc striking part are kept flush.
In this embodiment, the two opposite sides of the tip shroud 6 are the first side surface 1 and the second side surface 2, respectively. The first side surface 1 and the second side surface 2 are matched with each other, so that after the plurality of the blade shrouds 6 are combined, the first side surface 1 of each blade shroud 6 is attached to the second side surface 2 of the adjacent blade shroud 6. The first side 1 is provided with a V-shaped groove 11. One groove wall of the V-shaped groove 11 is provided as the weld face 3. The arc striking protrusion 4 is close to the bottom of the V-shaped groove 11. The second side surface 2 is provided with a limiting tooth 21 matched with the V-shaped groove 11. When the limiting teeth 21 are accommodated in the V-shaped groove 11, the outer wall of the limiting teeth 21 is attached to the groove wall of the V-shaped groove 11. The limiting tooth 21 is also provided with a welding surface 3 at one side of the welding surface 3 which is jointed with the V-shaped groove 11. The arc striking protrusion 4 of the limiting tooth 21 is close to the cusp of the limiting tooth 21. The top of the arc striking protrusion 4 of the limit tooth 21 is flush with the surface of the cusp. So that the wear-resistant alloy layer 5 is flush with the cusp after welding. When the first side surface 1 is attached to the second side surface 2 of the adjacent blade shroud 6, the wear-resistant alloy of the V-shaped groove 11 is attached to the wear-resistant alloy of the limiting tooth 21, and therefore the first side surface and the second side surface can not be abraded quickly due to mutual friction.
In this embodiment, after the welding of the wear-resistant alloy welding rod is completed, the welded portion is polished. Thereby enabling the shape and size of the dental crown to meet the design requirements.
The present invention has been described in terms of the preferred embodiment, and it is not intended to be limited to the embodiment. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The electromagnetic pulse welding method for the wear-resistant alloy of the blade shroud is characterized by comprising the following steps of: processing a welding surface (3), and reserving an arc striking bulge (4) on the welding surface (3); the wear-resistant alloy welding rod is close to the arc striking bulge (4) and the welding gun is close to the arc striking bulge (4) for striking an arc; after the arc striking bulge (4) is consumed, the wear-resistant alloy welding rod and the welding gun move at a constant speed along the welding surface (3) so that the molten wear-resistant alloy welding rod is attached to the surface of the molten welding surface (3).
2. The electromagnetic pulse welding method for the shroud wear-resistant alloy according to claim 1, characterized in that: the height of the arc striking protrusion (4) relative to the welding surface (3) is 0.3mm-0.5 mm.
3. The electromagnetic pulse welding method for the blade shroud wear-resistant alloy according to claim 1, characterized by comprising the following steps: the two opposite sides of the blade shroud (6) are respectively a first side surface (1) and a second side surface (2); the first side face (1) and the second side face (2) are matched with each other, so that after a plurality of the blade crowns (6) are combined, the first side face (1) of each blade crown (6) is attached to the second side face (2) of the adjacent blade crown (6); the first side surface (1) is provided with a V-shaped groove (11); one groove wall of the V-shaped groove (11) is set as the welding surface (3); the arc striking protrusion (4) is close to the bottom of the V-shaped groove (11).
4. The electromagnetic pulse welding method for the blade shroud wear-resistant alloy according to claim 3, characterized by comprising the following steps: the second side surface (2) is provided with a limiting tooth (21) matched with the V-shaped groove (11); when the limiting teeth (21) are accommodated in the V-shaped grooves (11), the outer walls of the limiting teeth (21) are attached to the groove walls of the V-shaped grooves (11); spacing tooth (21) laminate in one side of face of weld (3) of V-arrangement groove (11) also is provided with face of weld (3).
5. The electromagnetic pulse welding method for the blade shroud wear-resistant alloy according to claim 4, wherein: the arc striking protrusion (4) of the limiting tooth (21) is close to the cusp of the limiting tooth (21).
6. The electromagnetic pulse welding method for the shroud wear-resistant alloy according to claim 5, characterized in that: and after the welding of the wear-resistant alloy welding rod is finished, polishing the welding part.
7. The electromagnetic pulse welding method for the blade shroud wear-resistant alloy according to claim 5, characterized by comprising the following steps: the top of the arc striking protrusion (4) of the limiting tooth (21) is flush with the surface of the cusp.
8. The electromagnetic pulse welding method for the shroud wear-resistant alloy according to claim 1, characterized in that: the wear-resistant alloy welding rod is a Fe-Cr-Mo-B welding rod.
9. The electromagnetic pulse welding method for the blade shroud wear-resistant alloy according to claim 1, characterized by comprising the following steps: the thickness of the leaf crown (6) is 2mm-3 mm.
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