Friction stir welding device and friction stir welding method

Abstract

Provided are a friction stir welding device and a friction stir welding method with which it is possible to suppress the occurrence of electrolytic corrosion in a welding step without requiring a new corrosion-resistant treatment step. Comprising an anvil (10) that supports a laminate (PP), a probe (20) that is disposed facing the anvil (10) and is disposed so as to be capable of advancing, retreating and rotating with respect to the laminate (PP), and a shoulder member (30) that sandwiches the laminate (PP) together with the anvil (10), the probe (20) comprising: a joining probe (21) that forms a joining hole (P4) in a plate-like member (P) softened by frictional heat generated by sliding contact with the plate-like member (P) and that joins the plate-like member (P); a protruding part (P5) protruding in the shape of a dam is formed around the joint hole (P4); and a backfill probe (22) that backfills the protrusion (P5), which is softened by frictional heat generated by sliding contact with the protrusion (P5), into the joint hole (P4).

Description

Technical Field

[0001] The present invention relates to a friction stir welding device and a friction stir welding method for friction stir welding laminated plate-like members. Background Art

[0002] In recent years, there has been a strong demand to reduce adverse environmental impacts related to air quality in product manufacturing processes (SDGs 11.6) and to improve energy efficiency (SDGs 7.3).

[0003] In such a process, the method of joining multiple parts is reconsidered.

[0004] For example, arc welding and other welding methods are widely used as methods for joining multiple metal plates. However, compared with such joining methods, the joining method using friction stirring proposed in Patent Document 1 has attracted attention because it can suppress gas generated during the joining process and reduce power consumption.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent Application Laid-Open No. 2023-013804 Summary of the Invention

[0008] Problems to be solved by the invention

[0009] However, when different metals of raw materials are joined using friction stirring, adjacent portions of the materials having a large potential difference are exposed on the surface at the joined portion.

[0010] Therefore, when the joints come into contact with water due to condensation or the like, galvanic corrosion occurs. Therefore, corrosion resistance treatment (chemical conversion treatment, waterproof sealant coating, etc.) is required to prevent galvanic corrosion, which complicates the process.

[0011] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a friction stir welding apparatus and a friction stir welding method that can suppress the occurrence of electric corrosion in the joining process without requiring a new step of applying a waterproof sealant to the adjacent portions of the materials.

[0012] Means for solving problems

[0013] In order to achieve the aforementioned purpose, the friction stir welding device of the present invention is characterized in that it includes: an anvil, which supports a stack composed of stacked plate-like parts; a probe, which is arranged opposite to the anvil and is arranged to be able to advance and retreat relative to the stack and to rotate around a rotation axis along the advance and retreat direction; and a shoulder part, which has a cylindrical shape into which the probe can be inserted and clamps the stack together with the anvil, the probe including: a joining probe, which enters toward the plate-like part, and forms a joining hole and joins the plate-like part softened by friction heat generated by the joining surface in sliding contact with the plate-like part, and a raised portion protruding from the plate surface in a dam-like shape along the inner circumferential surface of the shoulder part is formed around the joining hole; and a backfill probe, which enters toward the plate-like part and backfills the raised portion softened by friction heat generated by the backfill surface in sliding contact with the raised portion into the joining hole, the joining probe and the backfill probe being arranged to be interchangeable.

[0014] Effects of the Invention

[0015] According to the present invention, friction stir welding can be performed in which the occurrence of electric corrosion in the joining process is suppressed without newly providing a step of applying a waterproof sealant to the adjacent portion of the materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 1 is a schematic diagram showing the configuration of a friction stir welding apparatus according to this embodiment.

[0017] Figure 2 It is an enlarged cross-sectional view of a main part showing a state where a stacked body is arranged in a joining step by friction stirring.

[0018] Figure 3 This is an enlarged cross-sectional view of a main part showing a state in which a joining probe enters and comes into sliding contact with a stacked body in a joining process based on friction stir.

[0019] Figure 4 This is an enlarged cross-sectional view of a main part showing a state in which a joining hole is formed in a laminated body and a raised portion is formed in a joining step by friction stir.

[0020] Figure 5 This is an enlarged cross-sectional view of a main part showing a state where plate-shaped members are welded by resistance welding in a joining process using friction stir.

[0021] Figure 6 This is an enlarged cross-sectional view of a main part showing a state in which a bonding probe is retracted during a welding process using friction stir.

[0022] Figure 7 This is an enlarged cross-sectional view of a main part showing a state in which a bonding probe in a friction stir bonding process is replaced with a backfill probe stack.

[0023] Figure 8 This is an enlarged cross-sectional view of a main part showing a state in which a backfill probe enters and comes into sliding contact with a raised portion in a friction stir welding process.

[0024] Figure 9 This is an enlarged cross-sectional view of a main part showing a state in which a joining hole is backfilled in a joining process by friction stir.

[0025] Figure 10 This is an enlarged cross-sectional view of a main part showing a state in which the backfill probe is retracted and the joining process is completed in the friction stir joining process.

[0026] Figure 11 This is an enlarged cross-sectional view of a main part showing a state in which a backfill probe enters and comes into sliding contact with a raised portion in a first modification in a welding process based on friction stir.

[0027] Figure 12 This is an enlarged cross-sectional view of a main part showing a state after the joining hole is backfilled by the first modified example in the joining process based on friction stir.

[0028] Figure 13 This is an enlarged cross-sectional view of a main part showing a state in which a backfill probe enters and comes into sliding contact with a raised portion in a second modification in a joining process based on friction stir.

[0029] Figure 14 This is an enlarged cross-sectional view of a main part showing a state after the joining hole is backfilled by the second modified example in the joining process based on friction stir.

[0030] Figure 15 This is a perspective view showing a backfill probe according to a third modified example.

[0031] Figure 16 It is a plan view showing the backfill surface in the backfill probe according to the third modified example.

[0032] Figure 17 It is shown along Figure 16 Cross-sectional view along line AA.

[0033] Figure 18 This is an enlarged cross-sectional view of a main part showing a state after the joining hole is backfilled by the first modified example in the joining process based on friction stir.

[0034] Description of Reference Numerals

[0035] S friction stir welding device

[0036] P plate-shaped parts

[0037] PP laminate

[0038] P4 bonding hole

[0039] P5 ridge

[0040] 10 anvil

[0041] 20 probes

[0042] 20a Rotation axis

[0043] 21 bonding probe

[0044] 21a Joint surface

[0045] 22 backfill probe (1st backfill probe)

[0046] 22a backfill surface (first backfill surface)

[0047] 22b backfill protrusion (first backfill protrusion)

[0048] 23 backfill probe (2nd backfill probe)

[0049] 23a backfill surface (second backfill surface)

[0050] 24 backfill probes (3rd backfill probe)

[0051] 24a backfill surface (the third backfill surface)

[0052] 24b backfill protrusion (the third backfill protrusion)

[0053] 25 backfill probe (4th backfill probe)

[0054] 25a backfill surface (4th backfill surface)

[0055] 25b vortex groove

[0056] 25c backfill protrusion (4th backfill protrusion)

[0057] 30 shoulder parts DETAILED DESCRIPTION

[0058] Reference Figures 1 to 10 A friction stir welding apparatus S according to one embodiment of the present invention will be described in detail.

[0059] In addition, in description, the same code|symbol is attached|subjected to the same element, and duplicate description is abbreviate|omitted.

[0060] The friction stir welding apparatus S of this embodiment welds plate-like members P that are overlapped in the plate thickness direction (see Figure 1 ).

[0061] Furthermore, the stacked plate-like members P are referred to as a laminated body PP.

[0062] In addition, in the friction stir welding apparatus S of this embodiment, the laminated body PP is arranged so that the plate surface thereof faces the vertical direction.

[0063] The laminated body PP is composed of three stacked metal plate-like members P (see Figure 1 ).

[0064] The uppermost plate-shaped member P (upper member P1 ) of the laminated body PP is made of an aluminum alloy.

[0065] In addition, the plate-shaped member P located in the middle (middle member P2 ) and the plate-shaped member P located at the bottom (lower member P3 ) of the laminated body PP are made of the same iron alloy.

[0066] That is, the upper member P1 is made of a material having a lower melting point than those of the middle member P2 and the lower member P3.

[0067] The friction stir welding apparatus S includes an anvil 10 , a probe 20 , a shoulder member 30 , a driving mechanism 40 , a resistance welder 50 , and a control unit 60 .

[0068] The anvil 10 is disposed so as to be able to advance and retreat relative to the probe 20 (the stacked body PP) along the rotation axis 20 a of the probe 20 , and is moved by the drive mechanism 40 .

[0069] In addition, the direction along the rotation axis 20a is referred to as the forward and backward direction.

[0070] The anvil 10 supports the laminated body PP from the lower side in a state of being advanced toward the probe 20 .

[0071] The anvil 10 includes a receiving portion 11 and a hemispherical portion 12 .

[0072] The receiving portion 11 and the hemispherical portion 12 are composed of different components.

[0073] The receiving portion 11 has a cylindrical shape and is arranged to be movable along the rotation axis 20 a .

[0074] The receiving portion 11 has an insulating material 13 disposed on an upper end surface that is in contact with the laminated body PP.

[0075] The hemispherical portion 12 is formed of a cylindrical member having an upwardly bulging hemispherical shape at its upper end, and is disposed within the tube of the receiving portion 11 .

[0076] The hemispherical portion 12 is arranged to be movable along the rotation axis 20 a together with the receiving portion 11 .

[0077] The hemispherical portion 12 is made of a conductive material.

[0078] The receiving portion 11 of the anvil 10 supports the laminated body PP, and the front end of the hemispherical portion 12 abuts against the laminated body PP.

[0079] The probe 20 performs bonding and backfilling on the laminated body PP.

[0080] The probe 20 is arranged so as to be rotatable around a rotation axis 20 a and to be able to advance and retreat relative to the anvil 10 (laminated body PP) along the rotation axis 20 a.

[0081] The probe 20 rotates and moves using the driving mechanism 40 as a driving source.

[0082] The probe 20 is formed of a material such as ceramics or cemented carbide.

[0083] That is, the probe 20 is made of a material that is harder and has a higher melting point than the material of the laminated body PP.

[0084] The probe 20 is composed of a joint probe 21 and a first backfill probe 22 (backfill probe).

[0085] The probe 20 is detachable from the friction stir welding apparatus S, and the welding probe 21 and the first backfill probe 22 are interchangeable.

[0086] The joining probe 21 joins three plate-like members P constituting the laminated body PP.

[0087] The bonding probe 21 has a substantially cylindrical shape and has a tapered shape with a tapered tip.

[0088] The bonding probe 21 rotates while Figures 1 to 10 The upper portion of the molded article enters downwardly toward the laminated body PP, and the bonding surface 21a formed at the front end thereof comes into sliding contact with the laminated body PP.

[0089] The upper member P1 , the middle member P2 , and the lower member P3 of the laminate PP are softened sequentially by frictional heat generated between the distal end of the bonding probe 21 and the laminate PP due to sliding contact.

[0090] Then, as the joining probe 21 is further advanced, the front end of the joining probe 21 pushes apart the components of the softened laminated body PP, thereby forming the joining hole P4 and joining the components.

[0091] Furthermore, inside the inner peripheral surface of the shoulder member 30 and around the engaging hole P4, a raised portion P5 protruding from the plate surface in a dam-like shape is formed by the member being pushed away.

[0092] The first backfill probe 22 backfills the raised portion P5 into the joining hole P4.

[0093] The first backfill probe 22 has a substantially cylindrical shape and has a first backfill surface 22a (backfill surface) at its front end. The first backfill surface 22a is a circular flat surface that is orthogonal to the rotation axis 20a and has a larger diameter than the outer diameter of the protrusion P5 (the inner diameter of the shoulder member 30).

[0094] Furthermore, a first backfill protrusion 22b is formed at the center of the first backfill surface 22a (on the rotation axis 20a).

[0095] The first backfill protrusion 22b has a substantially conical shape and protrudes toward the laminated body PP.

[0096] Note that the protrusion dimension of the first backfill protrusion 22b from the first backfill surface 22a is set smaller than the plate thickness dimension of the upper member P1, and the diameter of the base is set smaller than the hole diameter of the engaging hole P4.

[0097] That is, the shape of the first backfill protrusion 22 b is set so that the aluminum alloy layer in the joining hole P4 after backfilling has a size sufficient to suppress the occurrence of electrolytic corrosion.

[0098] The shoulder member 30 has a cylindrical shape with the rotation shaft 20 a as the central axis.

[0099] The probe 20 rotates and moves forward and backward within the tube of the shoulder member 30 .

[0100] The shoulder member 30 is arranged so as to be able to advance and retreat relative to the anvil 10 (laminated body PP) along the rotation axis 20 a .

[0101] The shoulder member 30 moves forward and backward using the shoulder driving mechanism 44 as a driving source.

[0102] The shoulder member 30 is formed of a conductive material.

[0103] The driving mechanism 40 includes a rotation driving mechanism 41 , an advance and retreat driving mechanism 42 , an anvil driving mechanism 43 , and a shoulder driving mechanism 44 .

[0104] The rotation drive mechanism 41 is a drive source for rotating the probe 20 .

[0105] The forward and backward driving mechanism 42 is a driving source for moving the probe 20 forward and backward.

[0106] The anvil driving mechanism 43 is a driving source for moving the anvil 10 forward and backward.

[0107] The shoulder driving mechanism 44 is a driving source for moving the shoulder member 30 forward and backward.

[0108] In the resistance welding 50 , the hemispherical portion 12 of the anvil 10 and the shoulder member 30 are used as electrodes, and current is passed through the laminate PP to weld the members constituting the laminate PP.

[0109] The control unit 60 controls the driving mechanism 40 and the resistance welding 50 .

[0110] Next, the operation (joining step) of the friction stir welding apparatus S will be described (see Figure 2-10 ).

[0111] First, the step of supporting the laminated body PP by the anvil 10 is performed (see Figure 2 ).

[0112] It should be noted that before this step, the bonding probe 21 is installed on the device body (see Figure 2 ).

[0113] In this step, first, the laminated body PP is placed on the anvil 10 .

[0114] Here, the laminated body PP is arranged so that the joining portion is located on the hemispherical portion 12 .

[0115] Then, the shoulder member 30 is moved in, and the laminated body PP is clamped and fixed by the shoulder member 30 and the anvil 10 .

[0116] In addition, in the above description, the laminated body PP is moved according to the position of the friction stir welding apparatus S, but the present invention is not limited to this.

[0117] For example, the position and orientation of the friction stir welding apparatus S may be moved or changed according to the laminated body PP while the laminated body PP is at its original position.

[0118] Next, the bonding surface 21a of the bonding probe 21 is pressed against the laminate PP, and the laminate PP is softened by frictional heat caused by sliding contact, thereby bonding the plate-like members P to each other and forming a raised portion P5 (see FIG. Figures 3 to 6 ).

[0119] In this step, the control unit 60 operates the driving mechanism 40 to rotate the bonding probe 21 and move it toward the laminated body PP (see FIG. Figure 3 ).

[0120] Then, the rotating joining surface 21 a is pressed against the laminated body PP, and the plate-shaped members P are softened sequentially by frictional heat generated by the sliding contact.

[0121] The bonding probe 21 is further rotated and inserted toward the laminated body PP, and the softened part of the bonding probe 21 is pushed away to form the bonding hole P4 (see FIG. Figure 4 ).

[0122] Then, a raised portion P5 is formed around the engaging hole P4 by the pushed-apart members, and the plate-like members P are joined to each other.

[0123] When the penetration dimension of the bonding probe 21 reaches the set value, the control unit 60 operates the resistance welding 50 to weld the middle member P2 and the lower member P3 (see FIG. Figure 5 ).

[0124] After welding, the control unit 60 stops the resistance welding 50 and moves the bonding probe 21 back while rotating, so that the bonding probe 21, the anvil 10 and the laminated body PP are separated (see FIG. Figure 6 ).

[0125] Note that, in this state, the hole wall of the bonding hole P4 is exposed as a material adjacent portion having a large potential difference.

[0126] Next, the step of replacing the bonding probe 21 with the first backfill probe 22 is performed (see Figure 7 ).

[0127] In this step, the welding probe 21 is removed from the apparatus main body (not shown) of the friction stir welding apparatus S, and the first backfill probe 22 is attached in its place, thereby replacing the probe 20 .

[0128] It should be noted that the shoulder member 30 may be moved to a position where it does not interfere with the first backfill probe 22 .

[0129] Next, the first backfill surface 22a of the first backfill probe 22 is pressed against the raised portion P5, and the raised portion P5 is softened by frictional heat caused by sliding contact, and the softened raised portion P5 is backfilled into the joint hole P4 by the first backfill surface 22a (see FIG. Figures 8-10 ).

[0130] In this step, the first backfill probe 22 is rotated and inserted into the raised portion P5 (laminated body PP) (see Figure 8 ).

[0131] The rotating first backfill surface 22a is pressed against the raised portion P5, and the raised portion P5 is softened by frictional heat caused by sliding contact.

[0132] The first backfill surface 22a is further advanced to backfill the softened portion of the raised portion P5 into the joint hole P4 (see FIG. Figure 9 ).

[0133] Furthermore, the through-hole P4 is backfilled so that the exposed adjacent portion of the hole wall material is covered.

[0134] When the entry size of the first backfill probe 22 reaches the set value, the control unit 60 rotates and moves the bonding probe 21 back, separating the first backfill probe 22, the anvil 10 and the laminated body PP (see FIG. Figure 6 ).

[0135] The joining process for one joining location is completed as described above, and the joining process for the next joining location is performed.

[0136] Next, the effects of this embodiment will be described.

[0137] By using the friction stir welding apparatus S of this embodiment, the welding hole P4 generated during welding can be backfilled in the welding step.

[0138] Furthermore, since adjacent portions of materials having a large potential difference can be covered so as not to be exposed on the surface, it is possible to prevent electrolytic corrosion from occurring on the material surface.

[0139] This eliminates the need for a new step of applying a waterproof sealant to the joining surface to prevent galvanic corrosion.

[0140] Furthermore, since the joining hole P4 is backfilled, the fracture area is increased, thereby improving the joining strength between the lower member P3 and the middle member P2.

[0141] Furthermore, in the friction stir welding apparatus S of the present embodiment, a first backfill protrusion 22 b is provided at the center of the first backfill surface 22 a of the first backfill probe 22 .

[0142] When the protrusion P5 is backfilled into the joining hole P4, the joining hole P4 is gradually filled from the outer peripheral side of the hole.

[0143] However, since the softened member does not generate friction with the first backfill surface 22 a , it may cool and harden while moving toward the center of the hole, resulting in filling failure.

[0144] Therefore, the friction surface near the center is increased by providing the first backfill protrusions 22 b.

[0145] Thus, the first backfill protrusion 22b comes into sliding contact with the hardened member while moving from the outer periphery to the center of the hole, softening the hardened member again, and can more reliably backfill the area near the center.

[0146] In the friction stir welding apparatus S of the present embodiment, the welding probe 21 and the first backfill probe 22 are exchanged by being attached to and detached from the apparatus main body, but the present invention is not limited to such a configuration.

[0147] For example, the bonding probe 21 and the first backfill probe 22 may be disposed adjacent to the apparatus main body, and the probe 20 may be moved laterally or rotationally by bonding and backfilling.

[0148] That is, the bonding probe 21 and the first backfill probe 22 can be replaced with each other while being attached to the apparatus body, thereby achieving the same operational effects.

[0149] Furthermore, when a plurality of locations for joining the laminate PP are set, after all the joining locations are joined with the joining probe 21 , the probe 20 can be replaced with the first backfill probe 22 to backfill all the joining holes P4 .

[0150] This reduces the time required for probe replacement, and thus shortens the time required for bonding and backfilling.

[0151] Furthermore, a unit (joining unit) for joining the probe 21 and the anvil 10 and a unit (refilling unit) for joining the first backfill probe 22 and the anvil 10 may be separately configured in one friction stir welding apparatus S.

[0152] Furthermore, by arranging these units adjacently and exchanging the units, the same operational effects can be obtained by using a method of replacing the probe 20 .

[0153] In addition, in the case of such a configuration, it is possible to perform joining of other portions by the joining unit while backfilling is being performed by the backfill unit.

[0154] Therefore, when multiple locations need to be joined, such a configuration can shorten the working time and is therefore more preferable.

[0155] In the friction stir welding apparatus S of this embodiment, the stacked bodies PP are stacked up and down, the anvil 10 supports the stacked bodies PP from below, and the probe 20 welds and backfills the stacked bodies PP from above, but the present invention is not limited to this embodiment.

[0156] For example, the stacked bodies PP may be stacked in the lateral direction, the anvil 10 may support the stacked bodies PP from the right side, and the probe 20 may join and backfill the stacked bodies PP from the left side.

[0157] That is, the direction in which the plate-like members are stacked is not limited, and joining and backfilling can be performed.

[0158] Next, refer to Figure 11 、 12 The first modified example of the backfill probe will be described in detail.

[0159] It should be noted that, in the description, the same elements as those in the aforementioned embodiment are denoted by the same reference numerals, and duplicate descriptions are omitted.

[0160] The shape of the second backfill surface 23 a of the second backfill probe 23 of this modification is different from the first backfill surface 22 a of the above-described embodiment.

[0161] The second backfill surface 23 a of the second backfill probe 23 of the present modification example is formed in a circular shape centered on the rotation axis 20 a and having an outer peripheral edge located outside the outer peripheral edge of the raised portion P5 .

[0162] Moreover, the 2nd backfill surface 23a has a concave surface shape consisting of a curved surface which is recessed so that the center part may be farthest from the plate surface of the laminated body PP.

[0163] That is, the outer peripheral edge of the second backfill surface 23 a is provided at a position farther away from the rotation axis 20 a than the inner periphery of the shoulder member 30 .

[0164] In addition, the second backfill surface 23a has a concave shape that is recessed rearward in the entry direction.

[0165] When the joint hole P4 is backfilled using the second backfill probe 23 of this modification, the softened member is pressed from the outer peripheral side toward the center side of the second backfill surface 23 a .

[0166] This can suppress the softened member from flowing out to the outside of the second backfill surface 23a, and can more reliably perform backfilling of the joining hole P4.

[0167] Next, refer to Figure 13 、 14 The second modified example of the backfill probe will be described in detail.

[0168] It should be noted that, in the description, the same elements as those in the aforementioned embodiment are denoted by the same reference numerals, and redundant descriptions are omitted.

[0169] The shape of the third backfill surface 24a of the third backfill probe 24 of this modification is different from the first backfill surface 22a of the above-described embodiment.

[0170] The third backfill surface 24a of the third backfill probe 24 of this modification has a shape obtained by combining the first backfill protrusion 22b of the first backfill probe 22 of the embodiment and the second backfill surface 23a of the second backfill probe 23 of the first modification.

[0171] That is, a substantially conical third backfill protrusion 24b is provided at the center of the concave shape.

[0172] With this configuration, the softened member can be moved from the outer periphery to the center in the concave portion, and the third backfill projection 24b can come into sliding contact with the cooled and hardened member while moving toward the center, thereby softening it again.

[0173] Thereby, the center portion of the bonding hole P4 can be backfilled more reliably.

[0174] Next, refer to Figures 15-18 The third modified example of the backfill probe will be described in detail.

[0175] It should be noted that, in the description, the same elements as those in the aforementioned embodiment are denoted by the same reference numerals, and redundant descriptions are omitted.

[0176] The shape of the fourth backfill surface 25a of the fourth backfill probe 25 of this modification is different from the first backfill surface 22a of the above-described embodiment.

[0177] The fourth backfill surface 25 a of the fourth backfill probe 25 of the present modification example is formed in a circular shape centered on the rotation axis 20 a and having an outer peripheral edge located outside the outer peripheral edge of the raised portion P5 .

[0178] In addition, a spiral groove (swirl groove 25b) is formed on the fourth backfill surface 25a so as to extend from the outer periphery to the center (see Figure 16 ).

[0179] Furthermore, a fourth backfill protrusion 25c similar to the first backfill protrusion 22b of the embodiment is provided at the center of the fourth backfill surface 25a.

[0180] Furthermore, the center side end portion of the swirl groove is connected to the fourth backfill protrusion 25c.

[0181] Therefore, by moving the 4th backfill probe 25 toward Figure 16 The counterclockwise rotation in the middle plays the role of concentrating the softened parts toward the fourth backfill protrusion 25c.

[0182] Furthermore, while the scroll groove 25b is moving toward the center, the fourth backfill protrusion 25c comes into sliding contact with the cooled and hardened member, thereby softening it again.

[0183] By backfilling the joint hole P4 using the fourth backfill probe 25 of this modification, the softened member moves within the swirl groove 25b and is pressed from the outer periphery toward the center of the fourth backfill surface 25a.

[0184] This can suppress the softened member from flowing out to the outside of the fourth backfill surface 25a, and can more reliably perform backfilling of the joining hole P4.

Claims

1. A friction stir welding device, characterized in that: include: an anvil that supports a stacked body composed of stacked plate-like members; a probe disposed opposite to the anvil and configured to be able to advance and retreat relative to the stacked body and to be rotatable about a rotation axis along the advancing and retreating direction; as well as The shoulder member has a cylindrical shape through which the probe can be inserted, and clamps the laminate together with the anvil. The probe includes: a joining probe that enters toward the plate-like member, forms a joining hole in the plate-like member softened by frictional heat generated by sliding contact between the joining surface provided therewith and the plate-like member, and performs joining, and forms a raised portion protruding from the plate surface in a dam-like manner along the inner peripheral surface of the shoulder member around the joining hole; as well as A backfill probe is inserted into the plate-like member to backfill the raised portion, softened by frictional heat generated by sliding contact between the backfill surface and the raised portion, into the engaging hole. The bonding probe and the backfill probe are configured to be interchangeable.

2. The friction stir welding device according to claim 1, wherein: The backfill probe is configured to be rotatable around a rotation axis along the forward and backward directions. The backfill surface has a circular shape centered on the rotation axis, A backfill protrusion is provided at the center thereof and protrudes toward the stacked body.

3. The friction stir welding device according to claim 1, wherein The backfill probe is configured to be rotatable around a rotation axis along the forward and backward directions. The backfill surface has a circular shape centered on the rotation axis and having an outer periphery located outside the outer periphery of the raised portion. The backfill surface has a concave shape consisting of a curved surface that is recessed so that the center portion thereof is farthest from the plate surface of the stacked body.

4. The friction stir welding device according to claim 1, wherein The backfill probe is configured to be rotatable around a rotation axis along the forward and backward directions. The backfill surface has a circular shape centered on the rotation axis and having an outer periphery located outside the outer periphery of the raised portion. The backfill surface includes a spiral swirl groove that is continuous from the outer peripheral edge thereof to the rotation axis.

5. A friction stir welding method, characterized in that: The following steps are included: an anvil supporting the stack; Pressing the bonding surface of the bonding probe against the laminated body to soften the laminated body by frictional heat generated by sliding contact, thereby bonding the plate-like members to each other, forming a bonding hole and a raised portion; replacing the joint probe with a backfill probe; as well as The backfill surface of the backfill probe is pressed against the raised portion to soften the raised portion by frictional heat caused by sliding contact, and the softened raised portion is backfilled into the engaging hole through the backfill surface.

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