WO2018143333A1

WO2018143333A1 - Linear friction welding method and linear friction welding device

Info

Publication number: WO2018143333A1
Application number: PCT/JP2018/003390
Authority: WO
Inventors: 藤井　英俊; 好昭森貞; 祥宏青木; 泰山　正則; 元村山
Original assignee: 国立大学法人大阪大学
Priority date: 2017-02-02
Filing date: 2018-02-01
Publication date: 2018-08-09
Also published as: JP2018122342A; JP6796839B2

Abstract

Provided are a simple linear friction welding method and linear friction welding method with which it is possible to minimize the amount of burrs discharged, while forming suitable joints. This method comprises a first step in which one member (2) is brought into contact with another member (4) to form an interface to be welded (6), a second step in which, with pressure being applied approximately perpendicularly with respect to the interface to be welded (6), one member (2) and another member (4) are repeatedly made to slide on the same path, discharging burrs (8) from the interface to be welded, approximately in parallel and approximately perpendicular to the direction of sliding, and a third step in which the sliding is stopped, forming a welding surface, and is characterized in that in the second step, the interface to be welded (6) is observed from a direction approximately perpendicular to the direction of sliding, and that the stop is executed in the third step at the moment when burrs (8) are discharged approximately in parallel with the direction of sliding.

Description

Linear friction welding method and linear friction welding device

The present invention relates to a linear friction welding method and a linear friction welding apparatus for solid-phase joining metal materials.

With the increase in strength of metal materials such as steel and aluminum alloys, a decrease in strength at the joint that determines the mechanical characteristics of the joint structure has become a serious problem. On the other hand, in recent years, solid-phase joining methods have been attracting attention because the maximum temperature reached during joining does not reach the melting point of the materials to be joined, and the strength reduction at the joints is small compared to conventional fusion welding. Progressing.

In particular, linear friction welding (LFW: Liner Friction Welding) in which metal members slide along a linear trajectory does not require the use of a tool like Friction Stir Welding (FSW: Friction Stir Welding). Can be easily applied, and is expected to be put to practical use in various industries.

However, the mechanism of linear friction welding and appropriate process control methods are not always clear, and the welding conditions for each material to be joined have been optimized based on numerous preliminary tests and experiences. Is the actual situation.

On the other hand, for example, in Patent Document 1 (Japanese Patent Laid-Open No. 2015-164738), one member is repeatedly moved relatively on the same locus in a state where one member is in contact with the other member, and the one member is In accordance with a stop command for relative movement of the one member with respect to the other member, and the one member becomes the other member from the generation of the stop command. On the other hand, there is disclosed a friction welding apparatus comprising stop means for stopping relative movement of the one member relative to the other member during a period until the locus is relatively moved once.

In the friction welding apparatus described in the above-mentioned Patent Document 1, when one member is brought into contact with the other member and repeatedly moved relative to each other on the same trajectory, the relative movement stop command is issued. It is said that it is possible to easily identify at which timing the relative movement of the two members is just stopped at the timing when the two members are in an appropriate joined state.

Japanese Patent Laying-Open No. 2015-164738

However, the friction welding method disclosed in Patent Document 1 shortens the time taken from the generation of a stop command to the stop of the actuator and controls the friction welding amount, and the minimum friction welding amount is sufficient. It is not intended to form a joint having a good joint characteristic.

In linear friction welding, since the material to be joined is shortened by the amount discharged as burrs, the joining should be stopped when a good joint is formed while minimizing the amount of burrs discharged as much as possible. Is desired. However, there is no appropriate method for determining the timing of the stop.

In view of the above-described problems in the prior art, an object of the present invention is to provide a simple linear friction welding method and linear friction welding capable of forming a good joint while minimizing the amount of burr discharged. To provide an apparatus.

In order to achieve the above-mentioned object, the present inventor pays attention to the situation where burrs are discharged as a result of intensive research on the observation method for confirming the progress of the joining process and the appropriate stop timing of sliding. Has been found to be extremely effective, and the present invention has been achieved.

That is, the present invention
A first step of bringing one member into contact with the other member to form a bonded interface;
In a state where a pressure is applied substantially perpendicularly to the interface to be joined, the one member and the other member are repeatedly slid on the same locus, and are substantially parallel and substantially perpendicular to the sliding direction. A second step of discharging burrs from the bonded interface;
A third step of stopping the sliding to form a joint surface,
In the second step, the bonded interface is observed from a direction substantially perpendicular to the sliding direction, and at the moment when the burr is discharged substantially parallel to the sliding direction, the third step is performed. Performing said stop in the process;
A linear friction joining method is provided.

Fig. 1 shows a schematic diagram showing the situation during linear friction welding. Linear friction welding is solid-phase bonding in which friction heat generated when the materials to be joined are rubbed together by linear motion is the main heat source. In the conventional linear friction welding, the material softened by the temperature rise is discharged as burrs from the interface to be joined, so that the oxide film formed on the interface to be joined is removed and the new surfaces are brought into contact with each other to join the joint. Is supposed to be obtained.

The present inventor has observed in detail the discharge amount, direction and order of burrs during the joining process of linear friction welding, and the first burrs are discharged from the joined interface in a direction substantially perpendicular to the sliding direction. After that, it was clarified that the gas was subsequently discharged from a substantially parallel direction. Generally speaking, the burr discharge direction at the initial stage of joining is substantially parallel to the sliding direction, but actually a different phenomenon occurs. In this specification, “sliding direction and substantially perpendicular direction” and “sliding direction and substantially parallel direction” are both directions substantially perpendicular to the applied pressure.

It is considered that the temperature distribution of the bonded interface has a great influence on the direction and order in which burrs are discharged from the bonded interface. Specifically, the materials to be joined are constantly in contact with each other at the center of the interface to be joined, and frictional heat is easily stored. As a result, the material to be joined is first softened in the region, and burrs are discharged from the “sliding direction and substantially perpendicular direction” that is the shortest distance from the region.

Here, in the linear friction welding, it is general that 0.2 to 0.5 seconds are required until the movement of the member completely stops after the sliding is stopped. By discharging the softened material (burrs) from all directions of the bonded interface, it is possible to grasp that the entire bonded interface is bonded, but when the movement of the member is stopped in accordance with the timing, Unnecessary burrs will be discharged. On the other hand, as a result of evaluating the joint and mechanical characteristics of the joint obtained by stopping the sliding at various timings, the present inventor found that the burr was discharged substantially parallel to the sliding direction. It was clarified that by performing the stop at this time, a good joint was formed while minimizing the amount of burrs discharged.

In order to accurately observe the moment when burrs are discharged substantially parallel to the sliding direction, it is necessary to observe the bonded interface from a direction substantially perpendicular to the sliding direction. Therefore, in the linear friction welding method of the present invention, it is a structural requirement to observe the interface to be joined from a direction substantially perpendicular to the sliding direction.

The present invention also provides:
A first step of bringing one member into contact with the other member to form a bonded interface;
In a state where a pressure is applied substantially perpendicularly to the interface to be joined, the one member and the other member are repeatedly slid on the same locus, and are substantially parallel and substantially perpendicular to the sliding direction. A second step of discharging burrs from the bonded interface;
A third step of stopping the sliding to form a joint surface,
In the second step, the bonded interface is observed from a direction substantially perpendicular to the sliding direction, and the burrs discharged substantially perpendicular to the sliding direction are at both ends of the bonded interface. Performing the stop in the third step at the moment of reaching
A linear friction joining method is also provided.

The behavior of burrs discharged during the linear friction welding process is as described above. However, if a stop is executed at the moment when the burrs are discharged almost parallel to the sliding direction, the oxide from the joint interface There is a case where the removal or the like is insufficient, and there is a case where the joint characteristics slightly deteriorate depending on the type, shape and size of the materials to be joined.

In contrast, the bonded interface is observed from a direction substantially perpendicular to the sliding direction, and the burrs discharged substantially perpendicular to the sliding direction reach the both ends of the bonded interface at the moment. By stopping the movement, the amount of burrs discharged is slightly larger compared to the case where the burrs are stopped at the moment when the burrs are discharged almost parallel to the sliding direction, but the oxide is more reliably Can be achieved.

Here, by observing the bonded interface from a direction substantially perpendicular to the sliding direction, the moment when the burrs discharged substantially perpendicular to the sliding direction reach both ends of the bonded interface. It can be easily grasped. Specifically, since the bonded interface emits light as burrs are discharged, it is only necessary to observe the moment when the emitted light reaches both ends of the bonded interface.

In the linear friction welding method of the present invention, it is preferable that the bonded interface is square or rectangular. The method for determining the timing to stop sliding by observing the discharge of burrs can be applied to the materials to be joined having various shapes, but if the interface to be joined is square or rectangular, the direction of burrs discharge In addition, the discharge timing can be more easily observed.

In the linear friction welding of the present invention, it is preferable that in the second step, the sliding direction is a substantially short direction of the one member and / or the other member. The area of the bonded interface that is constantly in contact during the sliding process as compared to the case where the sliding direction is the substantially short direction of one member and / or the other member, compared to the case where the sliding direction is substantially the longitudinal direction. Becomes smaller. That is, the temperature gradient caused by the generation of frictional heat and heat removal is larger when sliding in a substantially short direction, and as a result, the direction dependency in which burrs are discharged becomes more prominent. It is possible to more easily observe the discharge of burrs as an index for stopping.

Furthermore, in the linear friction welding of the present invention, it is preferable that the one member and / or the other member is an iron-based metal, titanium, or a titanium alloy. By making one member and / or the other member an iron-based metal, titanium, or titanium alloy, it is possible to easily confirm the generation of burrs or light emission accompanying the generation of burrs. In addition, it is possible to cope with thick plates that are difficult to join by the conventional solid-phase joining method and fusion welding method, and it is possible to effectively suppress the strength reduction of the joint due to excessive heat input.

The present invention also provides:
One member is brought into contact with the other member to form a bonded interface, and then the one member and the other member are moved in the same locus while pressure is applied substantially perpendicularly to the bonded interface. A linear friction welding device that repeatedly slides on and stops the sliding after discharging burrs from the bonded interface,
An observation device for observing the bonded interface from a direction substantially perpendicular to the sliding direction;
A linear friction welding apparatus is also provided.

By using an observation apparatus for observing the bonded interface from a direction substantially perpendicular to the sliding direction, the above-described linear friction welding method of the present invention can be easily used.

In the linear friction welding apparatus of the present invention, it is preferable to further include an observation apparatus for observing the bonded interface from a direction substantially parallel to the sliding direction.

By using an observation device for observing the bonded interface from a direction substantially parallel to the sliding direction, it is possible to observe the burr discharge behavior more reliably.

Furthermore, in the linear friction welding apparatus of the present invention, it is preferable that the observation device is a high-speed video camera. By using a high-speed video camera, it is possible to accurately grasp the discharge timing of burrs and the like that are difficult to measure with the naked eye.

According to the present invention, it is possible to provide a simple linear friction welding method and a linear friction welding apparatus capable of forming a good joint while minimizing the discharge amount of burrs.

It is a schematic diagram which shows one aspect | mode of the linear friction joining of this invention. It is a schematic diagram which shows the joining process of the linear friction joining of this invention. It is the high-speed video camera image observed from the direction substantially perpendicular to the direction of sliding. It is the high-speed video camera image observed from the direction substantially parallel to the direction of sliding. 2 is a cross-sectional photograph of a joint obtained in Examples 2 and 3 and Comparative Examples 1 to 4. It is the tensile strength of the joint obtained in Examples 2 and 3 and Comparative Examples 1, 2, and 4.

Hereinafter, typical embodiments of the linear friction welding method and the linear friction welding apparatus of the present invention will be described in detail with reference to the drawings, but the present invention is not limited to these. In the following description, the same or corresponding parts are denoted by the same reference numerals, and redundant description may be omitted. Further, since the drawings are for conceptually explaining the present invention, the dimensions and ratios of the components shown may be different from the actual ones.

(1) Linear Friction Joining Method FIG. 2 is a schematic diagram showing a joining process of linear friction joining according to the present invention. In the linear friction welding method of the present invention, a first step in which one member 2 is brought into contact with the other member 4 to form a bonded interface 6 and a state in which pressure is applied substantially perpendicular to the bonded interface 6 Then, the second member 4 and the other member 4 are repeatedly slid on the same locus, and the burr 8 is discharged from the bonded interface substantially parallel and substantially perpendicular to the sliding direction, and sliding is performed. A third step of stopping and forming a joint surface. Hereinafter, each step will be described in detail.

(1-1) First Step The first step is a step in which one member 2 is brought into contact with the other member 4 to form a bonded interface 6. The one member 2 and / or the other member 4 are moved to a place where the formation of the joining portion is desired, the joined surfaces are brought into contact with each other, and the joined interface 6 is formed.

The material of the one member 2 and the other member 4 is not particularly limited as long as the effects of the present invention are not impaired, and may have a metal phase that can be joined by linear friction welding. Or it is preferable that it is a titanium alloy. By using one member 2 and / or the other member 4 of an iron-based metal, titanium, or titanium alloy, it is possible to easily confirm the generation of burrs 8 or the light emission associated with the generation of burrs 8. In addition, it is possible to deal with thick plates that are difficult to join with the conventional joining method, and it is possible to effectively suppress a decrease in strength of the joined portion due to excessive heat input. In addition, in this invention, an iron-type metal means the metal which mainly has iron in a composition, For example, various steel, cast iron, etc. are contained.

Also, metals having higher thermal conductivity than iron and titanium, such as aluminum, magnesium, and copper, are likely to be subjected to frictional heat removal, so that linear friction welding is sometimes difficult. However, since the order (direction) in which burrs are discharged due to high thermal conductivity becomes clearer, the present invention can be achieved by using one member 2 and / or the other member 4 as these metal materials. The linear friction welding can be used more accurately.

Further, the shape and size of the one member 2 and the other member 4 are not particularly limited as long as the effects of the present invention are not impaired. Any desired pressurization and vibration can be realized by the linear friction welding apparatus. The bonded interface 6 is preferably a square or a rectangle. The method of determining the timing of stopping the sliding by observing the discharge of the burr 8 can be applied to the material to be joined having various shapes. However, when the interface 6 to be joined is square or rectangular, the second In the process, the discharge direction and discharge timing of the burr 8 can be more easily observed.

(1-2) Second Step In the second step, one member 2 and the other member 4 are repeatedly slid on the same locus in a state where pressure is applied substantially perpendicularly to the bonded interface 6. This is a step of discharging the burrs 8 from the bonded interface 6 substantially parallel and substantially perpendicular to the sliding direction.

The method of repeatedly sliding one member 2 and the other member 4 on the same trajectory is not particularly limited as long as the effect of the present invention is not impaired. Even if both members are vibrated together, one is fixed. Then, the other may be vibrated. Further, the process conditions (applied pressure, vibration frequency, amplitude, etc.) of linear friction welding are not particularly limited, and may be set as appropriate according to the material, shape, size, etc. of the materials to be joined.

Here, from the viewpoint of separately observing the burrs 8 discharged from the bonded interface 6 substantially parallel or substantially perpendicular to the sliding direction, the sliding direction is set to one member 2 and / or the other member 4. It is preferable that the direction is substantially short. Compared with the case where the longitudinal direction is substantially the longitudinal direction by setting the sliding direction to be the substantially short direction of the one member 2 and / or the other member 4, the bonded interface that is constantly in contact during the sliding process. The area of 6 becomes smaller. That is, the temperature gradient caused by the generation of frictional heat and heat removal is larger when sliding in a substantially short direction, and as a result, the direction dependency in which the burrs 8 are discharged becomes more prominent. It is possible to more easily observe the discharge of the burr 8 as an index for stopping the operation.

The discharge behavior of the burr 8 in the second process is grasped by observing the bonded interface 6 from a direction substantially perpendicular to the sliding direction. Although the observation method is not particularly limited, for example, by using a high-speed video camera and using a frame rate of about 2500 fps, it is possible to accurately know the behavior in which the burrs 8 are discharged.

(1-3) Third Step The third step is a step of forming a joint surface by stopping sliding in the second step. In the linear friction welding method of the present invention, at the moment when the burr 8 is discharged substantially parallel to the sliding direction, the sliding between the one member 2 and the other member 4 is stopped, thereby joining. Can be completed.

In the second step, the bonded interface 6 is observed from a direction substantially perpendicular to the sliding direction, and the sliding is stopped at the moment when the burr 8 is discharged substantially parallel to the sliding direction. As a result, it is possible to form a good bonded portion while minimizing the discharge amount of the burr 8 (minimizing consumption of the material to be bonded).

線形 In addition to the fact that the linear friction welding process proceeds at a high speed, 0.2 to 0.5 seconds are generally required until the operation completely stops after the sliding is stopped. Therefore, it is extremely difficult to form a good bonding region on the entire surface of the bonded interface while minimizing the discharge of the burrs 8, but the burrs 8 were discharged substantially parallel to the sliding direction. This can be realized by executing the stop of the sliding at the moment (while the sliding is completely stopped from the moment when the burr 8 is discharged substantially parallel to the sliding direction, A junction region is formed on the entire surface of the interface).

Further, the bonded interface 6 is observed from a direction substantially perpendicular to the sliding direction, and the burr 8 discharged substantially perpendicular to the sliding direction reaches the both ends of the bonded interface 6 at the moment. By stopping the movement, the amount of discharge of the burr 8 is slightly larger than that when the burr 8 is stopped at the moment when the burr 8 is discharged substantially parallel to the sliding direction, but more reliably. Oxide removal and the like can be achieved.

Here, by observing the bonded interface 6 from a direction substantially perpendicular to the sliding direction, the burrs 8 discharged substantially perpendicular to the sliding direction reached both ends of the bonded interface 6. You can easily grasp the moment. Specifically, since the bonded interface 6 emits light as the burr 8 is discharged, it is only necessary to observe the moment when the emitted light reaches both ends of the bonded interface 6.

(2) Linear friction welding apparatus The linear friction welding apparatus of this invention is comprised from the main-body part and the observation part, and a main-body part is the same as that of a conventionally well-known general linear friction welding apparatus.
Thus, the joining time of joining under the same conditions after the next time can be set.

The observation unit includes an observation device for observing the bonded interface 6 from a direction substantially perpendicular to the sliding direction of the one member 2 and the other member 4, and the burr 8 during the bonding process is provided. Emission can be observed. Here, the linear friction welding method of the present invention can be sufficiently executed only by an observation device arranged in a direction substantially perpendicular to the sliding direction, but the direction substantially parallel to the sliding direction. In addition, more accurate observation can be realized by arranging an observation device.

In the linear friction welding apparatus of the present invention, the discharge state of the burr 8 is observed by an observation device, and the moment when the burr 8 is discharged substantially parallel to the sliding direction or substantially perpendicular to the sliding direction. It is preferable to have a program that automatically stops sliding at the moment when the burr 8 discharged to the both ends of the interface 6 to be joined is reached. By measuring the time until, it can be set as the joining time of joining on the same conditions after the next time.

Moreover, in the linear friction welding apparatus of the present invention, it is preferable to use a high-speed video camera as an observation apparatus. By using a high-speed video camera, it is possible to accurately observe the discharge timing and discharge state of the burr 8. Here, the specifications of the high-speed video camera are not particularly limited as long as the effects of the present invention are not impaired, but for example, the observation frame rate is preferably 100 to 10,000 fps, and more preferably 125 to 5000 fps. . By setting the frame rate to these values, it is possible to accurately observe the discharge timing of the burr 8. As the observation device, for example, a photo sensor or a line sensor can be used in addition to the high-speed video camera.

Furthermore, the linear friction welding apparatus of the present invention preferably includes a mirror for observing the discharge state of the burr 8. By arranging the mirror at an appropriate position, it is possible to accurately observe the discharge timing and discharge state of the burr 8.

As mentioned above, although typical embodiment of this invention was described, this invention is not limited only to these, Various design changes are possible and these design changes are all contained in the technical scope of this invention. It is.

Example 1
A 20 mm × 20 mm × 65 mm titanium alloy (Ti-6Al-4V) was used as the material to be bonded, and linear friction bonding was performed using a 20 mm × 20 mm surface as a bonding surface. Here, linear friction welding was performed by a method in which one material to be joined was fixed and the other material to be vibrated, and the frequency was 50 Hz, the amplitude was ± 2 mm, and the applied pressure was 50 MPa.

FIG. 3 shows an image obtained by observing the bonded interface from a direction substantially perpendicular to the sliding direction at a frame rate of 2500 fps using a high-speed video camera. In the image 0.2 seconds after the start of joining, it can be confirmed that the discharge of burrs is started from a direction substantially perpendicular to the sliding direction. At this stage, no burrs are discharged from a direction substantially parallel to the sliding direction. On the other hand, when 1.2 seconds have elapsed from the start of joining, a large amount of burrs are discharged from both directions substantially perpendicular and substantially parallel to the sliding direction. Note that by observing the burr discharge state in FIG. 3, it was easy to grasp the moment when the burr discharge reached both ends of the bonded interface.

FIG. 4 shows an image obtained by observing the bonded interface from a direction substantially parallel to the sliding direction at a frame rate of 2500 fps using a high-speed video camera. When observed from a substantially parallel direction, it is difficult to confirm the emission of burrs from a substantially vertical direction clearly observed when observed from a substantially vertical direction in an image 0.2 seconds after the start of bonding. is there. The discharge of burrs in the vertical direction can be confirmed 0.5 seconds after the start of joining, but at this stage, the discharge of burrs is also started in a substantially parallel direction. After 1.1 seconds, only the length of the burrs discharged from the substantially vertical direction and the substantially parallel direction is increased, and no other particular change is observed. From FIG. 4, it was difficult to grasp the moment when the burr discharge reached both ends of the bonded interface.

3 and 4, in order to grasp the moment when the burrs are discharged from the direction substantially parallel to the sliding direction and the moment when the burrs are discharged at both ends of the bonded interface, the bonded interface is slid. It can be seen that it is necessary to observe from a direction substantially perpendicular to the direction of movement.

<< Example 2 >>
Linear friction welding was performed in the same manner as in Example 1 except that the frequency was 15 Hz and the applied pressure was 200 MPa.

As in Example 1, using a high-speed video camera, the bonded interface was observed from a direction substantially perpendicular to the sliding direction. Since burrs were discharged from a direction substantially parallel to the direction, the vibration (sliding) was stopped in 3 seconds.

Example 3
Linear friction welding was performed in the same manner as in Example 2 except that the vibration (sliding) was stopped in 3.5 seconds. Note that 3.5 seconds is the moment when the burr discharge reaches both ends of the bonded interface.

≪Comparative example 1≫
Linear friction welding was performed in the same manner as in Example 2 except that the vibration (sliding) was stopped in 1 second. In 1 second, no burr discharge was observed.

≪Comparative example 2≫
Linear friction welding was performed in the same manner as in Example 2 except that the vibration (sliding) was stopped in 2 seconds. In 2 seconds, burrs were discharged from a direction substantially perpendicular to the sliding direction, but no burrs were discharged from a direction substantially parallel to the sliding direction.

«Comparative Example 3»
Linear friction welding was performed in the same manner as in Example 2 except that the vibration (sliding) was stopped in 3.75 seconds. In 3.75 seconds, a large amount of burrs were discharged from both directions substantially perpendicular and substantially parallel to the sliding direction, and the reduction in the length of the joined bodies was remarkable.

<< Comparative Example 4 >>
Linear friction welding was performed in the same manner as in Example 2 except that the vibration (sliding) was stopped in 4 seconds. In 4 seconds, a large amount of burrs were discharged from both directions substantially perpendicular and substantially parallel to the sliding direction, and the length of the joined body was significantly reduced.

[Section observation of the joint]
In order to confirm the presence / absence of defect formation at the bonded portion and the state of the bonded interface, the cross section of the bonded portion was observed with an optical microscope.

FIG. 5 shows cross-sectional photographs of the joints obtained in Examples 2 and 3 and Comparative Examples 1 to 4. In Comparative Example 1 (1 s in FIG. 5) and 2 (2 s in FIG. 5) with a short joining time, an unjoined portion is confirmed, but Example 2 (3 s in FIG. 5), 3 (in FIG. 5) In 3.5 s) and Comparative Example 3 (3.75 s in FIG. 5) and 4 (4 s in FIG. 5), good joints without defects are formed. In Examples 2 and 3 and Comparative Examples 3 and 4, the thickness of the joint is almost the same, but in Comparative Examples 3 and 4, it can be seen that the joint is shortened.

[Tensile test]
The joints obtained in Examples 2 and 3 and Comparative Examples 1, 2, and 4 were subjected to a tensile test. A tensile tester (SHIMADZU Autograph AG-10TB) was used for the measurement, and the crosshead speed was 1 mm / min.

FIG. 6 shows the tensile strengths of the joints obtained in Examples 2 and 3 and Comparative Examples 1, 2, and 4. The joints obtained in Comparative Examples 1 and 2 having a short joining time had lower strength than other conditions, but in Examples 2, 3 and Comparative Example 4, the base material was broken, and the strength was almost the same.

From the above results, it is possible to observe the bonded interface from a direction substantially perpendicular to the sliding direction, and pay attention to the burr discharge status to complete the bonding process, which is good while minimizing burr discharge. It can be seen that a simple joint can be obtained.

2 ... one member,
4 ... the other member,
6: Bonded interface,
8 ... Bali.

Claims

A first step of bringing one member into contact with the other member to form a bonded interface;
In a state where a pressure is applied substantially perpendicularly to the interface to be joined, the one member and the other member are repeatedly slid on the same locus, and are substantially parallel and substantially perpendicular to the sliding direction. A second step of discharging burrs from the bonded interface;
A third step of stopping the sliding to form a joint surface,
In the second step, the bonded interface is observed from a direction substantially perpendicular to the sliding direction, and at the moment when the burr is discharged substantially parallel to the sliding direction, the third step is performed. Performing said stop in the process;
A linear friction welding method characterized by the above.
A first step of bringing one member into contact with the other member to form a bonded interface;
In a state where a pressure is applied substantially perpendicularly to the interface to be joined, the one member and the other member are repeatedly slid on the same locus, and are substantially parallel and substantially perpendicular to the sliding direction. A second step of discharging burrs from the bonded interface;
A third step of stopping the sliding to form a joint surface,
In the second step, the bonded interface is observed from a direction substantially perpendicular to the sliding direction, and the burrs discharged substantially perpendicular to the sliding direction are at both ends of the bonded interface. Performing the stop in the third step at the moment of reaching
A linear friction welding method characterized by the above.
The bonded interface is square or rectangular;
The linear friction welding method according to claim 1 or 2, characterized by the above-mentioned.
In the second step, the sliding direction is set to a substantially short direction of the one member and / or the other member,
The linear friction welding method according to any one of claims 1 to 3, wherein:
The one member and / or the other member is an iron-based metal, titanium or titanium alloy,
The linear friction welding method according to any one of claims 1 to 4, wherein:
One member is brought into contact with the other member to form a bonded interface, and then the one member and the other member are moved in the same locus while pressure is applied substantially perpendicularly to the bonded interface. A linear friction welding device that repeatedly slides on and stops the sliding after discharging burrs from the bonded interface,
An observation device for observing the bonded interface from a direction substantially perpendicular to the sliding direction;
A linear friction welding device.
Furthermore, an observation device for observing the bonded interface from a direction substantially parallel to the sliding direction,
The linear friction welding apparatus according to claim 6.
The observation device is a high-speed video camera;
The linear friction welding apparatus according to claim 6 or 7, wherein