CN114029603A - Magnesium alloy sheet high-speed friction stir welding clamping device and welding method - Google Patents
Magnesium alloy sheet high-speed friction stir welding clamping device and welding method Download PDFInfo
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- CN114029603A CN114029603A CN202110933049.2A CN202110933049A CN114029603A CN 114029603 A CN114029603 A CN 114029603A CN 202110933049 A CN202110933049 A CN 202110933049A CN 114029603 A CN114029603 A CN 114029603A
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- 238000003466 welding Methods 0.000 title claims abstract description 281
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- 238000005498 polishing Methods 0.000 claims description 14
- 229910000831 Steel Inorganic materials 0.000 claims description 11
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- 230000000149 penetrating effect Effects 0.000 claims description 4
- 244000137852 Petrea volubilis Species 0.000 claims description 3
- 238000009775 high-speed stirring Methods 0.000 claims description 3
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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
- B23K20/12—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding
- B23K20/122—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding using a non-consumable tool, e.g. friction stir welding
- B23K20/1245—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding using a non-consumable tool, e.g. friction stir welding characterised by the apparatus
- B23K20/126—Workpiece support, i.e. backing or clamping
-
- 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
- B23K20/12—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding
- B23K20/122—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding using a non-consumable tool, e.g. friction stir welding
-
- 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
- B23K20/22—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating taking account of the properties of the materials to be welded
- B23K20/233—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating taking account of the properties of the materials to be welded without ferrous layer
-
- 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
- B23K20/24—Preliminary treatment
-
- 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
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/08—Non-ferrous metals or alloys
- B23K2103/15—Magnesium or alloys thereof
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- Engineering & Computer Science (AREA)
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- Pressure Welding/Diffusion-Bonding (AREA)
Abstract
The invention provides a magnesium alloy sheet high-speed friction stir welding clamping device and a welding method, comprising the following steps: the roller comprises a roller shell, a rolling shaft arranged in the roller shell, a bearing arranged between the roller shell and the rolling shaft, fixed end covers arranged at two ends of the roller shell and connecting supports arranged at two ends of the rolling shaft; the connecting support is symmetrically arranged and comprises a connecting plate connected with the rolling shaft and a semicircular plate connected with one end of the connecting plate, and the semicircular plates of the connecting support are mutually furled to form a clamping ring used for being clasped with a head of the friction stir welding machine. The device is used for installing to friction stir welding machine head, when carrying out friction stir welding, will continuously treat that the welding butt joint surface compresses tightly and the compaction, ensures the welding quality of long straight welding seam, promotes the corrosion resisting property in welding seam district.
Description
Technical Field
The invention relates to the technical field of metal materials, in particular to a clamping device and a welding method for high-speed friction stir welding of a magnesium alloy sheet.
Background
The magnesium alloy is regarded as the most potential substitute material of the aluminum alloy due to good damping, shock absorption and electromagnetic shielding performance, smaller density and high specific strength, and is widely applied to transportation tools such as automobiles, rail transit and the like so as to realize light weight design to improve transportation capacity, save energy and reduce emission. The traditional connection mode of the magnesium alloy is mainly riveting and fusion welding. When the riveting connection is adopted, the manufacturing cost is increased by the opening hole, the weight is increased by the self weight of the rivet, the sealing performance of the riveting joint is poor, and the joint strength is low. When fusion welding is adopted for connection, the problems of eutectic with low melting point, welding seam inclusion, hot cracks, air holes, deformation and the like are easily formed in a welding seam area, so that the mechanical property and the corrosion resistance of a welding joint are rapidly reduced. In order to solve the connection defects of magnesium alloy riveting and fusion welding, the friction stir welding technology is rapidly developed and applied to magnesium alloy connection.
The friction stir welding technology is a novel solid-phase environment-friendly connecting technology, and can realize effective connection of magnesium alloys. However, the regions of the welded joint experience significant differences in texture due to the different degrees of thermomechanical stirring experienced. The nugget region undergoes the most intense thermo-mechanical agitation and complete dynamic recrystallization of the region occurs, forming fine equiaxed recrystallized grains. The thermomechanically affected zone undergoes less than complete dynamic recrystallization from mild thermomechanically agitation of the nugget zone, resulting in a mixed structure of partially recrystallized and deformed grains in that zone. The heat affected zone only undergoes the action of thermal cycle, and the phenomena of precipitated phase coarsening and grain growth occur. The microstructure difference of the welding joint can cause the mechanical and corrosion performances of the magnesium alloy friction stir welding joint to be reduced. Moreover, the welding temperature and strain rate are the main influencing factors affecting the grain size and the evolution of the precipitated phases. The higher the welding temperature is, the longer the high-temperature retention time is, the more easily coarsening of a precipitated phase is generated, the more favorably the dynamic recrystallization is generated, the higher the crystal boundary migration and diffusion capacity is, and the more easily growing of crystal grains is; the larger the strain rate is, the more easily the precipitated phase is cut off to be refined, and the more favorably the dislocation propagation and diffusion are, the higher the recrystallization nucleation rate is increased, and the grain refinement is realized. Therefore, in the friction stir welding process of the magnesium alloy, the rotating speed of the stirring head and the welding speed are selected as one of the main factors influencing the quality of a welded joint.
In the prior art, some methods for improving the friction stir welding of the magnesium alloy are based on the conventional rotating speed and welding speed, for example, a friction stir welding process for enhancing the mechanical property of a joint is disclosed in a patent document with the publication number of CN102528268B, and the technique is to add a forced cooling medium to quench a welding line in the welding process to improve the mechanical property of the joint under the processes of the rotating speed of 400-800 r/min and the welding speed of 50-200 mm/min. The technology has obvious effects on precipitation strengthening and fine-grain strengthening alloy, little effect on improving the mechanical property of the magnesium alloy joint, complex process, increased manufacturing cost to a certain extent and environmental pollution. The patent document with publication number CN111730194A discloses a friction stir welding method and device for medium-thickness magnesium alloy plates, which is characterized in that under the process of rotating speed of 1200 r/min and welding speed of 100 mm/min, a double-shaft-shoulder method of fixing an upper shaft shoulder and enabling a lower shaft shoulder to rotate provides heat input, the thickness direction still has heat input nonuniformity, and the assembling process of a stirring head and the difficulty risk of disassembling and assembling after welding are increased.
Therefore, the method for improving the magnesium alloy friction stir welding based on the conventional stirring head is used for improving the mechanical property and the corrosion property of the magnesium alloy sheet friction stir welding head, and has extremely important practical value for promoting the industrial application of the magnesium alloy friction stir welding and expanding the application field of the magnesium alloy structural member.
Disclosure of Invention
Aiming at the technical problems, the embodiment of the invention provides a clamping device and a welding method for high-speed friction stir welding of a magnesium alloy sheet.
The first aspect of the embodiments of the present invention provides a magnesium alloy sheet high-speed friction stir welding clamping device, including: the roller comprises a roller shell, a rolling shaft arranged in the roller shell, a bearing arranged between the roller shell and the rolling shaft, fixed end covers arranged at two ends of the roller shell and connecting supports arranged at two ends of the rolling shaft; the connecting support is symmetrically arranged and comprises a connecting plate and a semicircular plate, the connecting plate is connected with the rolling shaft, the semicircular plate is connected with one end of the connecting plate, and the semicircular plate of the connecting support is mutually folded to form a clamping ring used for being clasped with a head of the friction stir welding machine.
Optionally, the rolling shaft includes a main body section and connecting sections respectively connected to two ends of the main body section, a boss is circumferentially disposed in the middle of the main body section, the bearings are respectively disposed on two sides of the boss, and sealing rings are respectively disposed between the fixed end cover and the main body section.
Optionally, the other end of the connecting plate is provided with a mounting hole, and the connecting plate and the rolling shaft are locked by a first screw passing through the mounting hole.
Optionally, the fixed end cover is uniformly provided with a plurality of counter bores along the circumferential direction, and the fixed end cover is locked by second screws penetrating through the counter bores and the roller shell.
Optionally, an annular boss for fixing the bearing and an annular groove for accommodating the sealing ring are arranged in the fixed end cover.
The magnesium alloy sheet high-speed friction stir welding clamping device is used for being installed on a friction stir welding machine head, and when friction stir welding is carried out, the butt joint surfaces to be welded are continuously compressed and compacted, so that the welding quality of a long straight welding line is ensured, and the corrosion resistance of a welding line area is improved.
The invention also provides a high-speed friction stir welding method for the magnesium alloy sheet, which comprises a friction stir welding machine and the high-speed friction stir welding clamping device for the magnesium alloy sheet, which is arranged on the head of the friction stir welding machine, and comprises the following steps:
step a, polishing the butt joint surface of the magnesium alloy sheet;
b, fixing the polished magnesium alloy sheet on a workbench, and pressing the surface to be welded and butted by adopting a high-speed stirring friction welding clamping device for the magnesium alloy sheet;
and c, performing single-pass high-speed friction stir welding on the magnesium alloy sheet, wherein the rotating speed of a stirring head of the friction stir welding machine is more than 2000 rpm, and the welding speed is more than 500 mm/min.
Optionally, in the step a, the magnesium alloy sheet is polished by polishing the butt joint surface of the magnesium alloy sheet with sand paper, removing oxides, and removing abrasive dust with a steel brush or a blower, wherein the thickness of the magnesium alloy sheet is 1-2 mm.
Optionally, in the step b, compressing the butt joint surface to be welded by using a magnesium alloy sheet high-speed friction stir welding clamping device includes: adjusting the vertical position of a roller shell of the high-speed friction stir welding clamping device for the magnesium alloy sheet according to the height of the shaft shoulder end face of the stirring head, so that the contour line at the lowest part of the roller shell and the shaft shoulder end face are positioned at a uniform height; and adjusting the horizontal position of the roller shell according to the central line of the stirring pin of the stirring head to ensure that the vertical central line of the roller shell is superposed with the central line of the stirring pin.
Optionally, in the step c and the step d, a roller shell of the magnesium alloy sheet high-speed friction stir welding clamping device is in close contact with and is pressed against the butt joint surface of the welded magnesium alloy sheet.
Optionally, in the step c, the rotation speed of the stirring head of the friction stir welding machine is 3000-; preferably, the rotating speed of a stirring head of the friction stir welding machine is 3000 r/min, the welding speed is 1000 mm/min, the pressing amount is 0.1 mm, the inclination angle of the stirring head is 2.5 degrees, and the diameter of a shaft shoulder of the stirring head is 10 mm.
The magnesium alloy sheet high-speed friction stir welding method adopts high-speed friction stir welding, not only greatly improves the rotating speed of the stirring head, but also effectively accelerates the welding speed and reduces the diameter of the shaft shoulder of the stirring head, which is beneficial to adjusting the welding heat input in a large range and regulating and controlling the forming characteristics of a weld joint.
High rotating speed, high welding speed, small diameter of stirring head, low pressing amount, inclination angle of stirring head and the like are selected in a matching wayThe technological parameters are optimized, and the optimal parameter selection is obtained, so that the formed friction stir welding joint of the magnesium alloy sheet is attractive, and the surface, the back and the interior of the welding line are free of defects; the maximum tensile strength of a welding joint in a welding state can reach 238.0MPa, which is 93.1 percent of that of the base material; the self-corrosion potential of the welding seam area can be increased to-1.34V, and the self-corrosion current can be reduced to 9.1 x 10-7A accounts for 92.4 percent and 0.3 percent of the base material respectively, and the high-speed friction stir welding of the AZ31 magnesium alloy sheet is well realized.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
FIG. 1a is a schematic view of a magnesium alloy sheet high speed friction stir welding clamping device according to an embodiment of the present invention;
FIG. 1b is a front view of a connecting bracket of a magnesium alloy sheet high-speed friction stir welding clamping device according to an embodiment of the invention;
FIG. 1c is a left side view of a connecting bracket of a magnesium alloy sheet high-speed friction stir welding clamping device according to an embodiment of the invention;
FIGS. 2a and 2b are schematic views of the weld surface at conventional speeds in the background art;
2c, 2d, 2e, 2f are schematic weld surface views of an embodiment of the present invention when the high speed friction stir welding method of magnesium alloy sheet is used;
FIGS. 3a and 3b are line diagrams of macroscopic deformations of a weld at conventional speeds in the background art;
3c and 3d are macroscopic deformation line graphs of a welding seam of one embodiment when the high-speed friction stir welding method of the magnesium alloy sheet is adopted;
reference numerals:
the roller housing 1 is provided with a roller wheel,
a rolling shaft 2, a main body section 21, a connecting section 22, a boss 23,
the bearing 3, the roller washer 31,
the fixed end cap 4, the annular boss 41, the annular groove 42,
a connecting bracket 5, a connecting plate 51, a semicircular ring plate 52, a mounting hole 53, a connecting hole 54,
the sealing ring (6) is provided with a sealing ring,
the length of the first screw 71, the second screw 72,
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
It is to be understood that although the terms first, second, third, etc. may be used herein to describe various information, these information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present invention. The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination", depending on the context. The features of the following examples and embodiments may be combined with each other without conflict.
The following describes an embodiment of the present invention in detail with reference to fig. 1a to 3 d.
The first embodiment is as follows:
as shown in fig. 1a to 1c, a first aspect of an embodiment of the present invention provides a magnesium alloy sheet high-speed friction stir welding clamping device, including: the roller device comprises a roller shell 1, a rolling shaft 2 arranged in the roller shell 1, a bearing 3 arranged between the roller shell 1 and the rolling shaft 2, fixed end covers 4 arranged at two ends of the roller shell 1 and connecting supports 5 arranged at two ends of the rolling shaft 2; the connecting support 5 comprises a connecting plate 51 connected with the rolling shaft 3 and a semicircular plate 52 connected with one end of the connecting plate 51, and the semicircular plates 52 of the connecting support 5 are mutually folded to form a clamping ring used for being clasped with a head of the friction stir welding machine. The magnesium alloy sheet high-speed friction stir welding clamping device is used for being installed on a friction stir welding machine head, and when friction stir welding is carried out, the butt joint surfaces to be welded are continuously compressed and compacted, so that the welding quality of a long straight welding line is ensured, and the corrosion resistance of a welding line area is improved. As a preferred embodiment of the present invention, the connecting bracket 5 may include two symmetrically arranged connecting brackets, and the semicircular plates 52 of the two connecting brackets 5 are mutually folded to form a snap ring for clasping with the head of the friction stir welding machine.
The other end of the connecting plate 51 is provided with a mounting hole 53, and the connecting plate 51 and the rolling shaft 2 are locked by a first screw 71 passing through the mounting hole 53.
The rolling shaft comprises a main body section and connecting sections respectively connected with two ends of the main body section, a boss is arranged in the middle of the main body section along the circumferential direction, bearings are respectively arranged on two sides of the boss, and sealing rings are respectively arranged between the fixed end cover and the main body section.
The rolling shaft 2 comprises a main body section 21 and a connecting section 22 connected with two ends of the main body section 21, a boss 23 is arranged in the middle of the main body section 21 along the circumferential direction, the bearings 3 are respectively arranged on two sides of the boss 23, and a sealing ring 6 is respectively arranged between the fixed end cover 4 and the main body section 21. As a preferred embodiment of the present invention, the connecting section 22 includes two connecting sections connected to both ends of the main body section 21.
The two ends of the semicircular plates 52 are respectively provided with a connecting hole 54, and after the two semicircular plates 52 are mutually butted, the two semicircular plates are locked by a bolt 81 and a nut 82 penetrating through the connecting holes of the two semicircular plates 52.
The fixed end cover 4 is uniformly provided with a plurality of counter bores 41 along the circumferential direction, and the fixed end cover 4 is locked by second screws 72 penetrating through the counter bores 41 and the roller shell 1.
An annular boss 41 for fixing the bearing and an annular groove 42 for accommodating the sealing ring 6 are arranged in the fixed end cover 4.
Specifically, one of the fixed end covers 4 is fixed at one end of the roller housing 1, a roller gasket 31 is added into the other fixed end cover 4 to adjust the gap, and the other fixed end cover 4 is fixed at the other end of the roller housing 1 by a second screw 72, so that the roller housing 1 can flexibly rotate under the action of the rolling shaft 2. And then connecting the connecting bracket 5 to two ends of the rolling shaft 2 through the first screw 71, and fixing the magnesium alloy sheet high-speed friction stir welding clamping device on a friction stir welding machine head through a bolt 81 and a nut 82. The magnesium alloy sheet high-speed friction stir welding clamping device is simple in structure and convenient to install, and can ensure that the roller shell 1 is in close contact with and is compressed tightly on the butt joint surface of a welded sheet in the welding process.
When the magnesium alloy sheet high-speed friction stir welding clamping device is installed, the vertical position of a roller shell 1 of the magnesium alloy sheet high-speed friction stir welding clamping device is adjusted according to the height of the shaft shoulder end face of a stirring head, so that the contour line at the lowest part of the roller shell 1 and the shaft shoulder end face of the stirring head are positioned at a uniform height; and then the horizontal position of the roller shell 1 is adjusted according to the central line of the stirring pin of the stirring head, so that the vertical central line of the roller shell 1 is superposed with the central line of the stirring pin. In this way it is ensured that during the welding process the roller housing 1 continuously presses and compacts the abutment surfaces to be welded.
In the embodiment of the present invention, the conventional speed: the rotating speed is 1000-; the welding speed is 100-; high speed: the rotating speed is 3000-; the welding speed is 500-.
In the specific embodiment of the invention, the stirring head consists of a concentric circular shaft shoulder with an inclination angle and a circular truncated cone-shaped stirring pin, and the stirring head performs welding along the rolling direction of the plate; specifically, the diameter of the shaft shoulder can be 10 mm; a stirring pin, the length of the pin is 1.85 mm, the diameter of the top part is 3 mm, and the diameter of the root part is 4 mm; the welding inclination angle is 2.5 degrees, the pressing amount is 0.1 mm, and the stirring head rotates anticlockwise.
Welding materials: the rolled AZ31 magnesium alloy plate has the following dimensions: 330 mm long, 85 mm wide and 2 mm thick, and the following examples two to nine were tested under the same conditions using such a stirring head and a welding material.
Example two:
the second embodiment of the invention provides a high-speed friction stir welding method for magnesium alloy sheets, which comprises a friction stir welding machine and the high-speed friction stir welding clamping device for the magnesium alloy sheets, which is arranged on the head of the friction stir welding machine, and comprises the following steps:
step a1, polishing the butt joint surface of the magnesium alloy sheet;
step b1, fixing the polished magnesium alloy sheet on a workbench, and pressing the butt joint surface to be welded by adopting a magnesium alloy sheet high-speed stirring friction welding clamping device;
and c1, performing single-pass high-speed friction stir welding on the magnesium alloy sheet, wherein the rotating speed of a stirring head of the friction stir welding machine is more than 2000 rpm, and the welding speed is more than 500 mm/min.
Optionally, in the step a1, the magnesium alloy sheet is polished by polishing the butt joint surface of the magnesium alloy sheet with sand paper, removing oxides, and removing abrasive dust with a steel brush or a blower, wherein the thickness of the magnesium alloy sheet is 1-2 mm, and the magnesium alloy sheet is a commercially-rolled AZ31 magnesium alloy sheet with the thickness of 2 mm.
Specifically, in the step b1, the pressing the butt joint surface to be welded by using the magnesium alloy sheet high-speed friction stir welding clamping device includes: adjusting the vertical position of a roller shell of the high-speed friction stir welding clamping device for the magnesium alloy sheet according to the height of the shaft shoulder end face of the stirring head, so that the contour line at the lowest part of the roller shell and the shaft shoulder end face are positioned at a uniform height; and adjusting the horizontal position of the roller shell according to the central line of the stirring pin of the stirring head to ensure that the vertical central line of the roller shell is superposed with the central line of the stirring pin.
Optionally, in the step c1 and the step d1, the roller shell 1 of the magnesium alloy sheet high-speed friction stir welding clamping device is in close contact with and pressed against the butt joint surface of the welded magnesium alloy sheet.
Specifically, in the step c1, the rotation speed of the stirring head of the friction stir welding machine is 3000 rpm, the welding speed is 1000 mm/min, the pressing amount is 0.1 mm, the inclination angle of the stirring head is 2.5 degrees, and the diameter of the shaft shoulder of the stirring head is 10 mm.
Example three:
the third embodiment of the invention provides a high-speed friction stir welding method for magnesium alloy sheets, which comprises a friction stir welding machine and the high-speed friction stir welding clamping device for the magnesium alloy sheets, which is arranged on the head of the friction stir welding machine, and comprises the following steps of:
step a2, mechanically polishing the to-be-welded butt joint surface of a commercial rolled AZ31 magnesium alloy plate with the thickness of 2 mm, and then removing abrasive dust by using a steel brush or a blower;
step b 2: rigidly fixing the AZ31 magnesium alloy to-be-welded plate processed in the step a2 on a workbench in advance, and clamping and fixing the two sides of the plate;
step c 2: the magnesium alloy sheet high-speed friction stir welding clamping device which is assembled in advance is arranged on a friction stir welding machine head in advance, so that the axis of the roller shell 1 is horizontal;
step d 2: the vertical position of the roller shell 1 in the structure of the clamping device for high-speed friction stir welding of the magnesium alloy sheet is adjusted according to the height of the shaft shoulder end face of the stirring head, so that the contour line at the lowest part of the roller shell 1 is flush with the shaft shoulder end face, namely is positioned at the same height, and the sheet is compacted in the welding process;
step e 2: the horizontal position of the roller shell 1 in the magnesium alloy sheet high-speed friction stir welding clamping device structure is adjusted according to the central line of the stirring pin, so that the vertical central line of the roller shell 1 and the central line of the stirring pin are positioned on the same straight line, and the roller shell 1 of the magnesium alloy sheet high-speed friction stir welding clamping device can tightly press the butt joint surface of a welded sheet in the welding process;
step f 2: the single-pass high-speed friction stir welding is carried out by adopting the technological parameters that the rotating speed of a stirring head is 4000 revolutions per minute, the welding speed is 1000 mm per minute, the pressing amount is 0.1 mm, the inclination angle of the stirring head is 2.5 degrees, and the diameter of a shaft shoulder is 10 mm.
Example four:
the fourth embodiment of the invention provides a high-speed friction stir welding method for magnesium alloy sheets, which comprises a friction stir welding machine and the high-speed friction stir welding clamping device for the magnesium alloy sheets, which is arranged on the head of the friction stir welding machine, and comprises the following steps of:
step a3, mechanically polishing the to-be-welded butt joint surface of a commercial rolled AZ31 magnesium alloy plate with the thickness of 2 mm, and then removing abrasive dust by using a steel brush or a blower;
step b 3: rigidly fixing the AZ31 magnesium alloy to-be-welded plate processed in the step a3 on a workbench in advance, and clamping and fixing the two sides of the plate;
step c 3: the magnesium alloy sheet high-speed friction stir welding clamping device which is assembled in advance is arranged on a friction stir welding machine head in advance, so that the axis of the roller shell 1 is horizontal;
step d 3: the vertical position of the roller shell 1 in the structure of the clamping device for high-speed friction stir welding of the magnesium alloy sheet is adjusted according to the height of the shaft shoulder end face of the stirring head, so that the contour line at the lowest part of the roller shell 1 is flush with the shaft shoulder end face, namely is positioned at the same height, and the sheet is compacted in the welding process;
step e 3: the horizontal position of the roller shell 1 in the magnesium alloy sheet high-speed friction stir welding clamping device structure is adjusted according to the central line of the stirring pin, so that the vertical central line of the roller shell 1 and the central line of the stirring pin are positioned on the same straight line, and the roller shell 1 of the magnesium alloy sheet high-speed friction stir welding clamping device can tightly press the butt joint surface of a welded sheet in the welding process;
step f 3: the single-pass high-speed friction stir welding is carried out by adopting the technological parameters that the rotating speed of a stirring head is 5000 r/min, the welding speed is 1000 mm/min, the pressing amount is 0.1 mm, the inclination angle of the stirring head is 2.5 degrees, and the diameter of a shaft shoulder is 10 mm.
Example five:
the fifth embodiment of the invention provides a high-speed friction stir welding method for magnesium alloy sheets, which comprises a friction stir welding machine and the high-speed friction stir welding clamping device for the magnesium alloy sheets, which is arranged on the head of the friction stir welding machine, and comprises the following steps:
step a4, mechanically polishing the to-be-welded butt joint surface of a commercial rolled AZ31 magnesium alloy plate with the thickness of 2 mm, and then removing abrasive dust by using a steel brush or a blower;
step b 4: rigidly fixing the AZ31 magnesium alloy to-be-welded plate processed in the step a4 on a workbench in advance, and clamping and fixing the two sides of the plate;
step c 4: the magnesium alloy sheet high-speed friction stir welding clamping device which is assembled in advance is arranged on a friction stir welding machine head in advance, so that the axis of the roller shell 1 is horizontal;
step d 4: the vertical position of the roller shell 1 in the structure of the clamping device for high-speed friction stir welding of the magnesium alloy sheet is adjusted according to the height of the shaft shoulder end face of the stirring head, so that the contour line at the lowest part of the roller shell 1 is flush with the shaft shoulder end face, namely is positioned at the same height, and the sheet is compacted in the welding process;
step e 4: the horizontal position of the roller shell 1 in the magnesium alloy sheet high-speed friction stir welding clamping device structure is adjusted according to the central line of the stirring pin, so that the vertical central line of the roller shell 1 and the central line of the stirring pin are positioned on the same straight line, and the roller shell 1 of the magnesium alloy sheet high-speed friction stir welding clamping device can tightly press the butt joint surface of a welded sheet in the welding process;
step f 4: the single-pass high-speed friction stir welding is carried out by adopting the technological parameters that the rotating speed of a stirring head is 6000 r/min, the welding speed is 500 mm/min, the pressing amount is 0.1 mm, the inclination angle of the stirring head is 2.5 degrees and the diameter of a shaft shoulder is 10 mm.
Example six:
the sixth embodiment of the invention provides a high-speed friction stir welding method for magnesium alloy sheets, which comprises a friction stir welding machine and the high-speed friction stir welding clamping device for the magnesium alloy sheets, which is arranged on the head of the friction stir welding machine, and comprises the following steps:
step a 5: mechanically polishing the to-be-welded butt joint surface of a commercial rolled AZ31 magnesium alloy plate with the thickness of 2 mm, and then removing abrasive dust by using a steel brush or a blower;
step b 5: rigidly fixing the AZ31 magnesium alloy to-be-welded plate processed in the step a5 on a workbench in advance, and clamping and fixing the two sides of the plate;
step c 5: the magnesium alloy sheet high-speed friction stir welding clamping device which is assembled in advance is arranged on a friction stir welding machine head in advance, so that the axis of the roller shell 1 is horizontal;
step d 5: the vertical position of the roller shell 1 in the structure of the clamping device for high-speed friction stir welding of the magnesium alloy sheet is adjusted according to the height of the shaft shoulder end face of the stirring head, so that the contour line at the lowest part of the roller shell 1 is flush with the shaft shoulder end face, namely is positioned at the same height, and the sheet is compacted in the welding process;
step e 5: the horizontal position of the roller shell 1 in the magnesium alloy sheet high-speed friction stir welding clamping device structure is adjusted according to the central line of the stirring pin, so that the vertical central line of the roller shell 1 and the central line of the stirring pin are positioned on the same straight line, and the roller shell 1 of the magnesium alloy sheet high-speed friction stir welding clamping device can tightly press the butt joint surface of a welded sheet in the welding process;
step f 5: the single-pass high-speed friction stir welding is carried out by adopting the technological parameters that the rotating speed of a stirring head is 6000 r/min, the welding speed is 1000 mm/min, the pressing amount is 0.1 mm, the inclination angle of the stirring head is 2.5 degrees and the diameter of a shaft shoulder is 10 mm.
Example seven:
the seventh embodiment of the invention provides a high-speed friction stir welding method for magnesium alloy sheets, which comprises a friction stir welding machine and the high-speed friction stir welding clamping device for the magnesium alloy sheets, which is arranged on the head of the friction stir welding machine, and comprises the following steps of:
step a6, mechanically polishing the to-be-welded butt joint surface of a commercial rolled AZ31 magnesium alloy plate with the thickness of 2 mm, and then removing abrasive dust by using a steel brush or a blower;
step b6, rigidly fixing the AZ31 magnesium alloy to-be-welded plate processed in the step a6 on a workbench in advance, and clamping and fixing the two sides of the to-be-welded plate;
step c6, mounting the magnesium alloy sheet high-speed friction stir welding clamping device assembled in advance on a friction stir welding machine head in advance to enable the axis of the roller shell to be horizontal;
d6, adjusting the vertical position of the roller shell in the structure of the high-speed friction stir welding clamping device for the magnesium alloy sheet according to the height of the shaft shoulder end face of the stirring head, so that the contour line at the lowest part of the roller shell is flush with the shaft shoulder end face, namely is positioned at the same height, and the compaction of the sheet material in the welding process is ensured;
e6, adjusting the horizontal position of the roller shell in the magnesium alloy sheet high-speed friction stir welding clamping device structure according to the central line of the stirring pin, so that the vertical central line of the roller shell and the central line of the stirring pin are positioned on the same straight line, and ensuring that the roller shell 1 of the magnesium alloy sheet high-speed friction stir welding clamping device can compress the butt joint surface of the welded sheet in the welding process;
and f6, performing single-pass high-speed friction stir welding by adopting the technological parameters that the rotating speed of the stirring head is 6000 r/min, the welding speed is 2000 mm/min, the pressing amount is 0.1 mm, the inclination angle of the stirring head is 2.5 degrees, and the diameter of the shaft shoulder is 10 mm.
Example eight:
an eighth embodiment of the present invention provides a high-speed friction stir welding method for a magnesium alloy sheet, including a friction stir welding machine and a high-speed friction stir welding clamping device for a magnesium alloy sheet as described in any one of the above, which is provided on a head of the friction stir welding machine, the method including the steps of:
step a7, mechanically polishing the to-be-welded butt joint surface of a commercial rolled AZ31 magnesium alloy plate with the thickness of 2 mm, and then removing abrasive dust by using a steel brush or a blower;
step b7, rigidly fixing the AZ31 magnesium alloy to-be-welded plate processed in the step a7 on a workbench in advance, and clamping and fixing the two sides of the to-be-welded plate;
step c7, mounting the magnesium alloy sheet high-speed friction stir welding clamping device assembled in advance on a friction stir welding machine head in advance to enable the axis of the roller shell to be horizontal;
d7, adjusting the vertical position of the roller shell in the structure of the high-speed friction stir welding clamping device for the magnesium alloy sheet according to the height of the shaft shoulder end face of the stirring head, so that the contour line at the lowest part of the roller shell is flush with the shaft shoulder end face, namely is positioned at the same height, and the compaction of the sheet material in the welding process is ensured;
e7, adjusting the horizontal position of the roller shell in the magnesium alloy sheet high-speed friction stir welding clamping device structure according to the central line of the stirring pin, so that the vertical central line of the roller shell and the central line of the stirring pin are positioned on the same straight line, and ensuring that the roller shell 1 of the magnesium alloy sheet high-speed friction stir welding clamping device can compress the butt joint surface of the welded sheet in the welding process;
and f7, performing single-pass high-speed friction stir welding by adopting the technological parameters that the rotating speed of the stirring head is 7000 revolutions per minute, the welding speed is 1000 mm per minute, the pressing amount is 0.1 mm, the inclination angle of the stirring head is 2.5 degrees, and the diameter of the shaft shoulder is 10 mm.
Example nine:
the ninth embodiment of the invention provides a high-speed friction stir welding method for magnesium alloy sheets, which comprises a friction stir welding machine and the high-speed friction stir welding clamping device for the magnesium alloy sheets, which is arranged on the head of the friction stir welding machine, and comprises the following steps of:
step a8, mechanically polishing the to-be-welded butt joint surface of a commercial rolled AZ31 magnesium alloy plate with the thickness of 2 mm, and then removing abrasive dust by using a steel brush or a blower;
step b8, rigidly fixing the AZ31 magnesium alloy to-be-welded plate processed in the step a6 on a workbench in advance, and clamping and fixing the two sides of the to-be-welded plate;
step c8, pre-installing the magnesium alloy sheet high-speed friction stir welding clamping device assembled in advance on a friction stir welding machine head to enable the axis of the roller shell 1 to be horizontal;
d8, adjusting the vertical position of the roller shell 1 in the structure of the clamping device for high-speed friction stir welding of the magnesium alloy sheet according to the height of the shaft shoulder end face of the stirring head, so that the contour line at the lowest part of the roller shell 1 is flush with the shaft shoulder end face, namely, is positioned at the same height, and the compaction of the sheet material in the welding process is ensured;
e8, adjusting the horizontal position of the roller shell 1 in the magnesium alloy sheet high-speed friction stir welding clamping device structure according to the central line of the stirring pin, so that the vertical central line of the roller shell 1 and the central line of the stirring pin are positioned on the same straight line, and ensuring that the roller shell 1 of the magnesium alloy sheet high-speed friction stir welding clamping device can tightly press the butt joint surface of the welded sheet in the welding process;
and f8, performing single-pass high-speed friction stir welding by adopting the technological parameters that the rotating speed of the stirring head is 8000 revolutions per minute, the welding speed is 1000 mm per minute, the pressing amount is 0.1 mm, the inclination angle of the stirring head is 2.5 degrees, and the diameter of the shaft shoulder is 10 mm.
Example ten:
the tenth embodiment of the invention provides a high-speed friction stir welding method for magnesium alloy sheets, which comprises a friction stir welding machine and the high-speed friction stir welding clamping device for the magnesium alloy sheets, which is arranged on the head of the friction stir welding machine, and comprises the following steps:
step a9, mechanically polishing the to-be-welded butt joint surface of a commercial rolled AZ31 magnesium alloy plate with the thickness of 2 mm, and then removing abrasive dust by using a steel brush or a blower;
step b9, rigidly fixing the AZ31 magnesium alloy to-be-welded plate processed in the step a9 on a workbench in advance, and clamping and fixing the two sides of the to-be-welded plate;
step c9, pre-installing the magnesium alloy sheet high-speed friction stir welding clamping device assembled in advance on a friction stir welding machine head to enable the axis of the roller shell 1 to be horizontal;
d9, adjusting the vertical position of the roller shell 1 in the structure of the clamping device for high-speed friction stir welding of the magnesium alloy sheet according to the height of the shaft shoulder end face of the stirring head, so that the contour line at the lowest part of the roller shell 1 is flush with the shaft shoulder end face, namely, is positioned at the same height, and the compaction of the sheet material in the welding process is ensured;
e9, adjusting the horizontal position of the roller shell 1 in the magnesium alloy sheet high-speed friction stir welding clamping device structure according to the central line of the stirring pin, so that the vertical central line of the roller shell and the central line of the stirring pin are positioned on the same straight line, and ensuring that the roller shell 1 of the magnesium alloy sheet high-speed friction stir welding clamping device can tightly press the butt joint surface of the welded sheet in the welding process;
and f9, performing single-pass high-speed friction stir welding by adopting the technological parameters that the rotating speed of the stirring head is 8000 rpm, the welding speed is 2000 mm/min, the pressing amount is 0.1 mm, the inclination angle of the stirring head is 2.5 degrees, and the diameter of the shaft shoulder is 10 mm.
Example eleven:
an eleventh embodiment of the present invention provides a high-speed friction stir welding method for magnesium alloy sheets, which includes a friction stir welding machine and a high-speed friction stir welding clamping device for magnesium alloy sheets, which is provided on a head of the friction stir welding machine, and is similar to the method of the second embodiment, except that: the rotating speed of the stirring head is 8000 rpm, and the welding speed is 3000 mm/min.
Example twelve:
a twelfth embodiment of the present invention provides a high-speed friction stir welding method for a magnesium alloy sheet, including a friction stir welding machine and a high-speed friction stir welding clamping device for a magnesium alloy sheet as described in any one of the above embodiments, which is provided on a head of the friction stir welding machine, and the method is similar to the method of the second embodiment, except that: the rotating speed of the stirring head is 8000 rpm, and the welding speed is 5000 mm/min.
Example thirteen:
a thirteenth embodiment of the present invention provides a high-speed friction stir welding method for magnesium alloy sheets, including a friction stir welding machine and a high-speed friction stir welding clamping device for magnesium alloy sheets, which is provided on a head of the friction stir welding machine, and is similar to the method of the second embodiment, except that: the optimized technological parameters of the rotating speed of the stirring head of 1800 rpm, the welding speed of 200 mm/min, the pressing amount of 0.1 mm, the inclination angle of the stirring head of 2.5 degrees and the diameter of the shaft shoulder of 10 mm are adopted to carry out single-pass conventional speed friction stir welding for comparison with a high-speed friction stir welding head.
FIGS. 2a and 2b are schematic views of the weld surface at conventional speeds in the background art; specifically, fig. 2a is a schematic view of a weld surface at a stirring head rotation speed of 1600 rpm and a welding speed of 200 mm/min, and fig. 2b is a schematic view of a weld surface at a stirring head rotation speed of 1600 rpm and a welding speed of 500 mm/min.
2c, 2d, 2e and 2f are schematic weld surface diagrams when the high-speed friction stir welding method of the magnesium alloy sheet is adopted; specifically, fig. 2c is a schematic view of a weld surface at a welding speed of 1000 mm/min and a welding speed of 3000 r/min of a stir head, fig. 2d is a schematic view of a weld surface at a welding speed of 1000 mm/min and a stirring head of 8000 r/min and a welding speed of 3000 mm/min of a weld surface, fig. 2f is a schematic view of a weld surface at a stirring head of 8000 r/min and a welding speed of 5000 mm/min of a weld surface.
FIGS. 3a and 3b are line diagrams of macroscopic deformations of a weld at conventional speeds in the background art; at this point, the maximum macroscopic deformation of the weld was 7.3 mm.
3c and 3d are macroscopic deformation line graphs of welding seams when the magnesium alloy sheet high-speed friction stir welding method is adopted; at this point, the maximum macroscopic deformation of the weld was 6.8 mm.
Taking a commercial 2 mm thick AZ31 magnesium alloy rolled sheet weld as an example, after completing the entire high speed and conventional speed friction stir welding, 3 tensile specimens were processed perpendicular to the weld direction according to ASTM-E8 tensile specimen preparation standard for tensile performance testing, and 3 corrosion specimens were processed parallel to the weld direction in the weld zone according to ASTM G3-14 corrosion specimen preparation standard for corrosion performance testing.
The test data are respectively shown in table 1 and table 2, wherein table 1 is the mechanical property of the welding joint, and table 2 is the corrosion property of the surface of the welding seam area, and 1#, 2#, 3#, 4#, 5#, 6#, 7#, 8#, 9#, 10#, 11#, and 12# respectively correspond to embodiment two to embodiment thirteen of the invention.
TABLE 1 weld joint mechanical properties
Note: the tensile strength, the yield strength, the elongation after fracture and the joint coefficient in table 1 are average values of respective test data of 3 tensile samples of 1# plate welded joint, 3 tensile samples of 2# plate welded joint, 3 tensile samples of 3# plate welded joint, 3 tensile samples of 4# plate welded joint, 3 tensile samples of 5# plate welded joint, 3 tensile samples of 6# plate welded joint, 3 tensile samples of 7# plate welded joint, 3 tensile samples of 8# plate welded joint, 3 tensile samples of 9# plate welded joint, 3 tensile samples of 10# plate welded joint, 3 tensile samples of 11# plate welded joint and 3 tensile samples of 12# plate welded joint.
TABLE 2 weld zone surface corrosion performance
| Sample number | Process parameters | Self-corrosion potential/V | Self-corrosion current (A) |
| Base material | / | -1.45 | 2.82×10-4 |
| 1# | 3000rpm-1000mm/min | -1.39 | 2.0×10-6 |
| 2# | 4000rpm-1000mm/min | -1.39 | 2.34×10-6 |
| 3# | 5000rpm-1000mm/min | -1.52 | 3.39×10-6 |
| 4# | 6000rpm-500mm/min | -1.45 | 2.34×10-6 |
| 5# | 6000rpm-1000mm/min | -1.42 | 1.74×10-6 |
| 6# | 6000rpm-2000mm/min | -1.34 | 1.74×10-5 |
| 7# | 7000rpm-1000mm/min | -1.40 | 9.1×10-7 |
| 8# | 8000rpm-1000mm/min | -1.41 | 1.58×10-5 |
| 9# | 8000rpm-2000mm/min | -1.36 | 5.62×10-5 |
| 10# | 8000rpm-3000mm/min | -1.38 | 5.62×10-7 |
| 11# | 8000rpm-5000mm/min | -1.39 | 5.75×10-5 |
| 12# | 1800rpm-200mm/min | -1.31 | 4.47×10-6 |
In table 2, the self-corrosion potential and the self-corrosion current are 3 corrosion samples in the weld zone of the No. 1 plate, 3 corrosion samples in the weld zone of the No. 2 plate, 3 corrosion samples in the weld zone of the No. 3 plate, 3 corrosion samples in the weld zone of the No. 4 plate, 3 corrosion samples in the weld zone of the No. 5 plate, 3 corrosion samples in the weld zone of the No. 6 plate, 3 corrosion samples in the weld zone of the No. 7 plate, 3 corrosion samples in the weld zone of the No. 8 plate, 3 corrosion samples in the weld zone of the No. 9 plate, 3 corrosion samples in the weld zone of the No. 10 plate, 3 corrosion samples in the weld zone of the No. 11 plate, and the average value of the test data of 3 corrosion samples in the weld zone of the No. 12 plate.
The tensile property and corrosion property test results in tables 1 and 2 show that the joint welded by the high-speed friction stir welding process and the clamping device has good mechanical property and corrosion property, especially, the tensile strength of the joint can reach 84.5% -93.1% of that of the parent metal under the process parameter combination of the rotating speed of the stirring head of 3000-8000 rpm and the welding speed of 500-1000 mm/min, the self-corrosion potential is smaller than that of the parent metal, but the self-corrosion current is reduced by 2-3 orders of magnitude compared with the parent metal, and the self-corrosion property is obviously improved. Compared with the tensile strength, the self-corrosion potential and the self-corrosion current of a welding joint welded under the technological parameters of the optimized conventional stirring head rotating speed and welding speed (1800 rpm, 200 mm/min), the comprehensive performance is better under the technological parameters of high rotating speed and welding speed (3000-8000 rpm, 500-1000 mm/min), especially the technological parameters and parameters of No. 7, No. 5, No. 2 and No. 1.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The utility model provides a magnesium alloy sheet high-speed friction stir welding clamping device which characterized in that includes: the roller comprises a roller shell, a rolling shaft arranged in the roller shell, a bearing arranged between the roller shell and the rolling shaft, fixed end covers arranged at two ends of the roller shell and connecting supports arranged at two ends of the rolling shaft; the connecting support is symmetrically arranged and comprises a connecting plate and a semicircular plate, the connecting plate is connected with the rolling shaft, the semicircular plate is connected with one end of the connecting plate, and the semicircular plate of the connecting support is mutually folded to form a clamping ring used for being clasped with a head of the friction stir welding machine.
2. The magnesium alloy sheet high-speed friction stir welding clamping device according to claim 1, wherein the rolling shaft comprises a main body section and connecting sections respectively connected with two ends of the main body section, a boss is arranged in the middle of the main body section along the circumferential direction, the bearings are respectively arranged on two sides of the boss, and sealing rings are respectively arranged between the fixed end cover and the main body section.
3. The magnesium alloy sheet high-speed friction stir welding clamping device according to claim 1, wherein the other end of the connecting plate is provided with a mounting hole, and the connecting plate and the rolling shaft are locked by a first screw passing through the mounting hole.
4. The magnesium alloy sheet high-speed friction stir welding clamping device of claim 1, wherein the fixed end cover is uniformly provided with a plurality of counter bores along the circumferential direction, and the fixed end cover is locked by a second screw penetrating through the counter bores and the roller housing.
5. The magnesium alloy sheet high-speed friction stir welding clamping device according to claim 1, wherein an annular boss for fixing a bearing and an annular groove for accommodating the sealing ring are arranged in the fixed end cover.
6. A high-speed friction stir welding method for magnesium alloy sheets, which is characterized by comprising a friction stir welding machine and the clamping device for the high-speed friction stir welding of the magnesium alloy sheets according to any one of claims 1 to 5, which is arranged on a head of the friction stir welding machine, wherein the method comprises the following steps:
step a, polishing the butt joint surface of the magnesium alloy sheet;
b, fixing the polished magnesium alloy sheet on a workbench, and pressing the surface to be welded and butted by adopting a high-speed stirring friction welding clamping device for the magnesium alloy sheet;
and c, performing single-pass high-speed friction stir welding on the magnesium alloy sheet, wherein the rotating speed of a stirring head of the friction stir welding machine is more than 2000 rpm, and the welding speed is more than 500 mm/min.
7. The high-speed friction stir welding method for magnesium alloy sheets according to claim 6, wherein in the step a, the step of polishing the magnesium alloy sheets is to polish the butt joint surfaces of the magnesium alloy sheets by using sand paper, remove oxides, and remove abrasive dust by using a steel brush or a blower, wherein the thickness of the magnesium alloy sheets is 1-2 mm.
8. The high-speed friction stir welding method for magnesium alloy sheets according to claim 6, wherein in the step b, the pressing the butt joint surfaces to be welded by the magnesium alloy sheet high-speed friction stir welding clamping device comprises: adjusting the vertical position of a roller shell of the high-speed friction stir welding clamping device for the magnesium alloy sheet according to the height of the shaft shoulder end face of the stirring head, so that the contour line at the lowest part of the roller shell and the shaft shoulder end face are positioned at a uniform height; and adjusting the horizontal position of the roller shell according to the central line of the stirring pin of the stirring head to ensure that the vertical central line of the roller shell is superposed with the central line of the stirring pin.
9. The high-speed friction stir welding method of magnesium alloy sheets according to claim 6, wherein in the steps c and d, the roller shell of the clamping device for high-speed friction stir welding of magnesium alloy sheets is in close contact with and pressed against the butt joint surface of the welded magnesium alloy sheets.
10. The high-speed friction stir welding method for magnesium alloy sheets according to claim 6, wherein in the step c, the rotation speed of the stirring head of the friction stir welding machine is 3000-8000 rpm, the welding speed is 500-1000 mm/min, the pressing amount is 0.1-0.2 mm, the inclination angle of the stirring head is 2-4 degrees, and the diameter of the shaft shoulder of the stirring head is 8-12 mm; preferably, the rotating speed of a stirring head of the friction stir welding machine is 3000 r/min, the welding speed is 1000 mm/min, the pressing amount is 0.1 mm, the inclination angle of the stirring head is 2.5 degrees, and the diameter of a shaft shoulder of the stirring head is 10 mm.
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| CN114789296A (en) * | 2022-05-19 | 2022-07-26 | 昆山六丰机械工业有限公司 | Preheating method before friction stir welding |
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