CN112548315B

CN112548315B - Full-isolation type static shaft shoulder welding tool

Info

Publication number: CN112548315B
Application number: CN202011388831.2A
Authority: CN
Inventors: 树西; 万龙; 黄体方
Original assignee: Kunshan World Wide Special Welding Co ltd
Current assignee: Suzhou Wanzhi New Energy Technology Co ltd
Priority date: 2020-12-02
Filing date: 2020-12-02
Publication date: 2023-02-10
Anticipated expiration: 2040-12-02
Also published as: CN112548315A

Abstract

The invention discloses a full-isolation type static shaft shoulder welding tool which comprises a stirring head, a static shaft shoulder and a friction ring, wherein the stirring head comprises a clamping section, a stirring section and a stirring pin which is convexly arranged at the center of the end part of the stirring section; the friction ring is sleeved between the stirring section and the static shaft shoulder and is in contact with the inner wall of the static shaft shoulder, the stirring head can drive the friction ring to rotate synchronously, the friction ring can rub against the inner wall of the static shaft shoulder to generate heat so as to soften the welded material entering between the static shaft shoulder and the stirring section, and the welded material is discharged from the chip removal hole. According to the fully-isolated static shaft shoulder welding tool, the friction ring is added between the stirring head and the static shaft shoulder, so that the welded material is fully isolated from moving upwards, and the friction ring and the inside of the static shaft shoulder generate heat through friction, so that the welded material moving upwards is fully softened or even melted, chip removal is facilitated, and the disassembly and cleaning frequency and the use cost are reduced.

Description

Full-isolation type static shaft shoulder welding tool

Technical Field

The invention belongs to the technical field of friction stir welding, and particularly relates to a full-isolation type static shaft shoulder welding tool.

Background

Static shoulder friction stir welding is the novel welding technique that develops on traditional friction stir welding technique, is different from shaft shoulder and the integrative formula of stirring head and synchronous revolution design in traditional soldering set, does not rotate along with the stirring tool among the static shoulder welding process, and the heat input volume of production is little. Because quiet shaft shoulder and stirring head have the motion each other in quiet shaft shoulder friction stir welding soldering set, quiet shaft shoulder and stirring head are detached, consequently, there is certain clearance between quiet shaft shoulder and the stirring head, lead to being squeezed into the gap between quiet shaft shoulder and the stirring head along this clearance easily by the welding material among the welding process inside, influence the normal use of soldering set, quiet shaft shoulder friction stir welding soldering set needs regularly to dismantle the clearance, it is low to use troublesome reliability, reduce welding efficiency, and the wearing and tearing of stirring head increase, influence life, increase use cost.

Patent document CN201710903383.7 discloses a static shaft shoulder friction stir welding tool beneficial for discharging seeping materials, which is characterized in that a through hole is processed at the bottom of the static shaft shoulder, so that welding scraps can be discharged through the through hole in the welding process, and a stepped shaft is arranged on a stirring head, so that the welding scraps can be prevented from moving upwards. But because the temperature of the welding scrap moving upwards is lower and the softening degree is not high, the scrap removal is difficult; and a gap still exists between the stepped shaft and the static shaft shoulder, and welding scraps can still move upwards.

The above description is included in the technical recognition scope of the inventors, and does not necessarily constitute the prior art.

Disclosure of Invention

In order to solve the above problems, an object of the present invention is to provide a full-isolation type stationary shaft shoulder welding set, which can completely isolate the welded material from moving upwards between the stirring head and the stationary shaft shoulder, and can sufficiently soften or even melt the welded material moving upwards, thereby facilitating chip removal, effectively solving the problems of difficult chip removal and incapability of completely preventing the welding chips from moving upwards in the stationary shaft shoulder friction stir welding, reducing the frequency of disassembly and cleaning, reducing the use cost, improving the welding efficiency, and having strong practicability.

In order to achieve the purpose, the invention provides a full-isolation type static shaft shoulder welding tool which comprises a stirring head and a static shaft shoulder, wherein the stirring head comprises a clamping section, a stirring section and a stirring pin which is convexly arranged in the center of the end part of the stirring section, the static shaft shoulder is coaxially sleeved outside the stirring section and can rotate relative to the stirring head, and one end of the static shaft shoulder, which is close to the stirring pin, is provided with a chip removal hole; the full-isolation type static shaft shoulder welding tool is characterized by further comprising a friction ring, the friction ring is sleeved between the stirring section and the static shaft shoulder and is in contact with the inner wall of the static shaft shoulder, the stirring head can drive the friction ring to rotate synchronously, and the friction ring can rub against the inner wall of the static shaft shoulder to generate heat so as to soften welded materials entering the static shaft shoulder and the stirring section and enable the welded materials to be discharged from the chip removal holes.

In one example, the inner ring shape of the friction ring is matched with the cross section shape of the stirring section, and the cross section shape of the stirring section is polygonal, elliptical or irregular, so that the stirring head can drive the friction ring to rotate synchronously.

In one example, the fully isolated static shoulder welding tool further comprises an elastic element, the elastic element is arranged between the stirring section and the static shoulder and is in contact with the friction ring, and the elastic element can generate a force towards one end of the stirring pin along the axial direction of the stirring head to the friction ring, so that the friction ring is tightly attached to the inner wall of the static shoulder.

In one example, the elastic element is detachably arranged between the stirring section and the static shaft shoulder, and the elastic element comprises a plurality of models with different elastic coefficients and/or lengths.

In one example, the outer periphery of the friction ring is provided with a friction surface fitted to an inner wall surface of the stationary shoulder, the friction surface being capable of coming into close contact with the inner wall surface of the stationary shoulder to generate heat by sliding friction.

In one example, the friction ring comprises a ring body and a ball, the ball is arranged on the periphery of the ring body in a rolling embedded mode, and the ball can be in rolling contact with the inner wall surface of the static shaft shoulder to generate heat through rolling friction.

In one example, the friction ring is made of a material having a melting point higher than that of the material to be welded.

In one example, the friction ring is made of a material having a hardness lower than that of the stationary shoulder.

In one example, a cooling flow passage is arranged in a region, far away from the chip removal hole, of the static shaft shoulder, and cooling liquid can be introduced into the cooling flow passage to cool the static shaft shoulder.

In one example, the outer circumference of the pin is provided with a thread.

The fully-isolated static shaft shoulder welding tool provided by the invention can bring the following beneficial effects:

1. according to the fully-isolated static shaft shoulder welding tool, the friction ring is added between the stirring head and the static shaft shoulder, and is in close contact with the inner wall of the static shaft shoulder, so that the welded material can be fully prevented from moving upwards in a gap between the stirring head and the static shaft shoulder, and the friction ring and the inside of the static shaft shoulder generate heat through friction, so that the upward-moving welded material is fully softened and even melted, chip removal is facilitated, and the welding chips are prevented from moving upwards.

2. Through the inner ring shape that sets up the cross sectional shape looks adaptation with the stirring section, and the cross sectional shape of stirring section is polygon, ellipse or dysmorphism, and the friction ring can only be along the axial motion of stirring head and can not carry out radial motion, can transmit the moment of torsion between stirring section and the friction ring, can guarantee stirring section drive friction ring synchro-rotation motion, and the friction ring generates heat with the inner wall friction of quiet shaft shoulder, can effectively soften the welding bits, simple structure, and the transmission is reliable and stable, and the practicality is strong.

3. Through setting up the elastic component, can make the inner wall of friction ring inseparable complete contact quiet shoulder all the time, totally cut off completely by welding material and shift up to make under the effect of elastic component to have certain effect of power between the inner wall of friction ring and quiet shoulder, guarantee that the friction ring normally works, friction heat production between friction ring and the quiet shoulder inner wall is softened the quilt welding material that shifts up fully, guarantees normal chip removal, and the practicality is strong.

4. The output power of the adjustable elastic component of elastic component through using different coefficient of elasticity or length to adjust the friction heat production of friction ring and quiet shoulder inner wall, can select suitable elastic component according to the melting point of the material that is welded, with the suitable temperature that generates heat of control, can soften the material that is welded, reduce frictional temperature as far as possible again, extension quiet shoulder life, the practicality is strong.

5. Through setting up the friction surface, can guarantee the area of contact of friction ring and quiet shaft shoulder inner wall, guarantee abundant complete contact, the softening of guaranteeing to generate heat is prevented by welding material and completely isolated by welding material rebound in the gap between stirring head and quiet shaft shoulder, guarantees welding process's normal clear, and the practicality is strong.

6. Through setting up the ball, the ring body does not contact with the inner wall of quiet shaft shoulder, roll through the ball can become rolling friction with friction ring's sliding friction, reduce the friction heat production, improve the life of quiet shaft shoulder, and be favorable to promoting the rotational speed, can reduce by the volume of shifting up of welding material to a great extent, the axiality of stirring head and quiet shaft shoulder can also be guaranteed in the joining of ball, avoid stirring head and quiet shaft shoulder direct contact, the life of whole isolated quiet shaft shoulder welding set of extension, therefore, the clothes hanger is strong in practicability.

7. Through setting up the friction ring that the melting point is higher than the material by welding, can guarantee that friction ring normal use just can soften the material by welding, guarantee normal chip removal, reduce manufacturing and use cost, the practicality is strong.

8. Through the friction ring with low hardness, the service life of the static shaft shoulder can be effectively prolonged, the equipment cost is reduced, and the practicability is high.

9. Through setting up the cooling flow channel, can reduce the temperature of quiet shaft shoulder, can guarantee that only friction ring and quiet shaft shoulder internal contact's friction zone temperature is higher, and other positions of quiet shaft shoulder temperature are lower, effectively prolong the life of quiet shaft shoulder, reduce equipment cost, the practicality is strong.

10. Through setting up the screw thread, can improve the friction efficiency of generating heat, improve welding efficiency, guarantee the welding effect, the practicality is strong.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is an exploded view of a fully insulated static shoulder welding tool according to an embodiment of the present invention;

FIG. 2 is a partial cross-sectional view of a fully isolated stationary shoulder welder according to an embodiment of the present invention;

FIG. 3 is a full sectional view of a fully isolated stationary shoulder welder according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a stirring head provided in the embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a stationary shoulder according to an embodiment of the present invention;

FIG. 6 is a cross-sectional view of a stationary shoulder provided in accordance with an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a friction ring provided in accordance with an embodiment of the present invention;

FIG. 8 is a schematic view of a friction ring and a stir head according to an embodiment of the present invention;

FIG. 9 is a full cross-sectional view of a fully insulated static shoulder bonding tool according to another embodiment of the present invention;

FIG. 10 is a schematic view of a friction ring engaged with a stationary shoulder according to another embodiment of the present invention;

fig. 11 is a schematic structural view of a friction ring according to another embodiment of the present invention.

Detailed Description

In order to more clearly explain the overall concept of the invention, the following detailed description is given by way of example in conjunction with the accompanying drawings.

In the description of the present invention, it is to be understood that the terms "central," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings, which are simply for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; the connection can be mechanical connection, electrical connection or communication; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. In the description of the present specification, reference to the description of the terms "one aspect," "some aspects," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the aspect or example is included in at least one aspect or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same solution or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any one or more aspects or examples in a suitable manner.

As shown in fig. 1 to 11, an embodiment of the present invention provides a fully isolated static shoulder welding tool 100, which includes a stirring head 1, a static shoulder 2 and a friction ring 3, where the stirring head 1 includes a clamping section 11, a stirring section 12 and a stirring pin 13 protruding from the center of an end of the stirring section 12, the static shoulder 2 is coaxially sleeved outside the stirring section 12 and can rotate relative to the stirring head 1, and one end of the static shoulder 2 close to the stirring pin 13 is provided with a chip removal hole 21; the friction ring 3 is sleeved between the stirring section 12 and the static shaft shoulder 2 and is in contact with the inner wall of the static shaft shoulder 2, the stirring head 1 can drive the friction ring 3 to rotate synchronously, the friction ring 3 can rub against the inner wall of the static shaft shoulder 2 to generate heat so as to soften the welded material entering between the static shaft shoulder 2 and the stirring section 12, and the welded material is discharged from the chip removal hole 21. According to the fully-isolated static shaft shoulder welding tool 100, the friction ring 3 is added between the stirring head 1 and the static shaft shoulder 2, the friction ring 3 is in close contact with the inner wall of the static shaft shoulder 2, the welded material can be fully prevented from moving upwards in a gap between the stirring head 1 and the static shaft shoulder 2, and the friction ring 3 and the static shaft shoulder 2 generate heat through internal friction, so that the moved welded material is fully softened and even melted, chip removal is facilitated, and the welding chips are prevented from moving upwards.

In one embodiment, the side wall of the stationary shoulder 2 is provided with clearance holes 21 or flutes.

Specifically, the inner ring shape of the friction ring 3 is matched with the cross section shape of the stirring section 12, and the cross section shape of the stirring section 12 is polygonal, elliptical or irregular, so that the stirring head 1 can drive the friction ring 3 to synchronously rotate. Through the inner ring shape that sets up the cross sectional shape looks adaptation with stirring section 12, and the cross sectional shape of stirring section 12 is the polygon, oval or dysmorphism, friction ring 3 only can be along the axial motion of stirring head 1 and can not carry out radial motion, can transmit the moment of torsion between stirring section 12 and the friction ring 3, can guarantee the 3 synchronous revolution motion of 12 drive friction ring of stirring section, friction ring 3 generates heat with the inner wall friction of quiet shaft shoulder 2, can effectively soften the welding bits, moreover, the steam generator is simple in structure, the transmission is reliable and stable, therefore, the clothes hanger is strong in practicability.

In one embodiment, the profile is a pattern comprising multiple curved lines or a closed pattern comprising both straight lines and curved lines, and the pin 1 and the friction ring 3 can transmit torque through these mechanisms. For example, the cross section of the stirring section 12 is D-shaped, and the stirring head 1 and the friction ring 3 are connected through a D-shaped structure; or, a spline or a flat key is integrally formed on the periphery of the stirring section 12, and the stirring head 1 and the friction ring 3 are connected through a spline or a flat key structure.

In one embodiment, the stirring section 12 is provided with one or more ribs in the axial direction.

Specifically, totally isolated formula dead axle shoulder welding set 100 still includes elastic component 4, and elastic component 4 sets up between stirring section 12 and dead axle shoulder 2 to contact with friction ring 3, elastic component 4 can produce the power towards stirring needle 13 one end along the axial of stirring head 1 to friction ring 3, so that friction ring 3 hugs closely in the inner wall of dead axle shoulder 2. Through setting up elastic component 4, can make the inner wall of 3 inseparable full contact with quiet shaft shoulder 2 of friction ring all the time, totally cut off completely by the welding material and shift up to make under the effect of elastic component 4 and have certain effect of force between the inner wall of friction ring 3 and quiet shaft shoulder 2, guarantee that friction ring 3 normally works, the friction heat production between friction ring 3 and the quiet shaft shoulder 2 inner wall fully softens the welding material who shifts up, guarantees normal chip removal, and the practicality is strong.

In one embodiment, the elastic member 4 may be a disc spring, an elastic pad, a spring, or the like capable of providing an axial pushing force to the friction ring 3.

Specifically, the elastic member 4 is detachably installed between the stirring section 12 and the stationary shoulder 2, and the elastic member 4 includes various types having different elastic coefficients and/or lengths. Through the output power that uses the adjustable elastic component 4 of the elastic component 4 of different elasticity coefficient or length to adjust the friction heat production of

friction ring

3 and 2 inner walls of quiet shaft shoulder, can select suitable elastic component 4 according to the melting point of the material that is welded, with the suitable temperature that generates heat of control, can soften the material that is welded, reduce friction temperature as far as possible again, extension quiet shaft shoulder 2 life, the practicality is strong.

In one embodiment, a stopping step 14 is disposed between the clamping section 11 and the stirring section 12 of the stirring head 1, the elastic member 4 is a spring, and the spring is sleeved outside the stirring section 12 and has one end abutting against the stopping step 14 and the other end abutting against the friction ring 3.

Specifically, in one embodiment, as shown in fig. 7, the outer periphery of the friction ring 3 is provided with a friction surface 31 fitted to the inner wall surface of the stationary shoulder 2, and the friction surface 31 can be brought into close contact with the inner wall surface of the stationary shoulder 2 to generate heat by sliding friction. Through setting up friction surface 31, can guarantee the area of contact of friction ring 3 with 2 inner walls of quiet shaft shoulder, guarantee abundant complete contact, guarantee to generate heat the softening by welding material with completely isolated stop by welding material rebound in the gap between stirring head 1 and quiet shaft shoulder 2, guarantee welding process's normal clear, the practicality is strong.

In another embodiment, as shown in fig. 9 to 11, the friction ring 3 includes a ring body 32 and balls 33, the balls 33 are disposed on the outer periphery of the ring body 32 in a rolling manner, and the balls 33 can be in rolling contact with the inner wall surface of the stationary shoulder 2 to generate heat by rolling friction. Through setting up ball 33, ring body 32 not with the inner wall contact of quiet shoulder 2, the rolling through ball 33 can become rolling friction with the sliding friction of friction ring 3, reduce the friction heat production, improve the life of quiet shoulder 2, and be favorable to promoting the rotational speed, can reduce the volume of shifting up by welding material to a great extent, the axiality of stirring head 1 and quiet shoulder 2 can also be guaranteed in the joining of ball 33, avoid stirring head 1 and quiet shoulder 2 direct contact, the life of whole isolated quiet shoulder welding set of extension 100, therefore, the clothes hanger is strong in practicability.

In one embodiment, the friction ring 3 is provided with a plurality of balls 33, which can reduce the amount of welded material moving up through the friction ring 3 by increasing the number of balls 33; the rotation speed of the friction ring 3 provided with the balls 33 can be made faster, and the friction ring 3 at a high rotation speed can reduce the amount of upward movement of the material to be welded.

Specifically, the friction ring 3 is made of a material having a melting point higher than that of the material to be welded. Through setting up the friction ring 3 that the melting point is higher than the material by welding, can guarantee that friction ring 3 normal use just can soften the material by welding, guarantee normal chip removal, reduce manufacturing and use cost, the practicality is strong.

In one embodiment, the friction ring 3 may be made of copper or steel, and the melting point of the material is higher than that of the material to be welded.

Specifically, the friction ring 3 is made of a material having a hardness lower than that of the stationary shoulder 2. Through the friction ring 3 that adopts the low rigidity, can effectively prolong the life of quiet shaft shoulder 2, reduce equipment cost, the practicality is strong.

Specifically, a cooling flow passage is provided in the region of the stationary shoulder 2 away from the clearance hole 21, and a cooling liquid can be introduced into the cooling flow passage to cool the stationary shoulder 2. Through setting up the cooling flow channel, can reduce the temperature of quiet shaft shoulder 2, can guarantee that only friction ring 3 is higher with the regional temperature of the friction of 2 internal contact of quiet shaft shoulder, and other positions of quiet shaft shoulder 2 temperature are lower, effectively prolong the life of quiet shaft shoulder, reduction equipment cost, the practicality is strong.

Specifically, the outer circumferential surface of the agitating pin 13 is provided with a thread. Through setting up the screw thread, can improve the friction efficiency of generating heat, improve welding efficiency, guarantee the welding effect, the practicality is strong.

When the fully isolated static shoulder welding tool 100 of the present invention is in use: firstly, selecting an elastic part 4 with proper length and elasticity coefficient according to the length of a stirring section 12 of a stirring head 1, selecting a friction ring 3 with proper melting point and hardness according to the melting point of a welded material and the hardness of a static shaft shoulder 2, installing the friction ring 3 on the stirring head 1, coaxially installing the stirring head 1, the friction ring 3 and the elastic part 4 in the static shaft shoulder 2, and enabling the friction ring 3 to be tightly attached to the inner wall of the static shaft shoulder 2 through the elastic part 4; then, the fully isolated static shaft shoulder welding tool 100 is installed on welding equipment for welding operation, when the welded material enters a gap between the stirring head 1 and the static shaft shoulder 2, the friction ring 3 can prevent the welded material from moving upwards, the friction ring 3 and the static shaft shoulder 2 generate heat through friction, the high-temperature friction ring 3 softens the welded material moving upwards, and the softened welded material is discharged through the chip removal hole 21; and finally, the stirring head 1 and the static shaft shoulder 2 are detached and cleaned regularly to ensure normal use.

The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.

The above description is only an example of the present invention, and is not intended to limit the present invention. Various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A full-isolation type static shaft shoulder welding tool comprises a stirring head and a static shaft shoulder, wherein the stirring head comprises a clamping section, a stirring section and a stirring pin which is convexly arranged at the center of the end part of the stirring section, the static shaft shoulder is coaxially sleeved outside the stirring section and can rotate relative to the stirring head, and a chip removal hole is formed in one end, close to the stirring pin, of the static shaft shoulder; the full-isolation type static shaft shoulder welding set is characterized by further comprising a friction ring, the friction ring is sleeved on the stirring section and is in contact with the inner wall of the static shaft shoulder, the stirring head can drive the friction ring to rotate synchronously, and the friction ring can rub and heat with the inner wall of the static shaft shoulder to soften welded materials which enter the static shaft shoulder and the stirring section and enable the welded materials to be discharged from the chip removal holes.

2. The isolated static shoulder welding tool according to claim 1, wherein the inner ring of the friction ring has a shape adapted to the cross-sectional shape of the stirring section, and the cross-sectional shape of the stirring section is polygonal, elliptical or irregular, so that the stirring head can drive the friction ring to rotate synchronously.

3. The fully isolated stationary shoulder welding set according to claim 1, further comprising an elastic member disposed between the stirring segment and the stationary shoulder and contacting the friction ring, wherein the elastic member is capable of generating a force toward one end of the stirring pin along the axial direction of the stirring head to the friction ring, so that the friction ring is tightly attached to the inner wall of the stationary shoulder.

4. The fully insulated static shoulder welding tool according to claim 3, wherein said elastic member is detachably mounted between said stirring section and said static shoulder, and said elastic member comprises a plurality of types having different elastic coefficients and/or lengths.

5. The fully insulated static shoulder welding tool according to claim 1, wherein the outer circumference of the friction ring is provided with a friction surface adapted to the inner wall surface of the static shoulder, and the friction surface can be in close contact with the inner wall surface of the static shoulder to generate heat by sliding friction.

6. The fully isolated stationary shoulder welding set according to claim 1, wherein the friction ring comprises a ring body and balls, the balls are embedded on the periphery of the ring body in a rolling manner, and the balls can be in rolling contact with the inner wall surface of the stationary shoulder to generate heat through rolling friction.

7. The fully insulated static shoulder welding tool according to claim 1, wherein said friction ring is made of a material having a melting point higher than that of said material to be welded.

8. The fully insulated static shoulder welding tool according to claim 1, wherein said friction ring is made of a material having a hardness lower than the hardness of said static shoulder.

9. The fully isolated stationary shoulder welding tool according to claim 1, wherein a cooling channel is disposed in a region of the stationary shoulder away from the chip removal hole, and a cooling fluid can be introduced into the cooling channel to cool the stationary shoulder.

10. The fully insulated static shoulder welding tool according to claim 1, wherein the outer circumferential surface of the stirring pin is provided with threads.