JP2001259849A - Flash welding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flash welding method for construction steel members with a large cross-section, by which the problem of the local buckling of construction members to be welded is solved, by which welding can be conveniently performed with excellent execution property and precision, and which is economical. SOLUTION: Reaction plates 3 or reaction bands are mounted on the steel members with the large cross-section to be welded, the reaction plates 3 or the reaction bands of two steel members with the large cross-section are connected with each other to be welded, by plural straight line drive type actuators 5, and electrodes 6 for power feeding are mounted on the respective steel members with the large cross-section. By pressuring with a synchronized displacement control for a flash process and an upset process by the actuators 5, the butt welding of joining surfaces is performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of flash welding in which large structural steel members for construction are butt-welded to each other.

[Prior art]

Conventionally, flash welding methods and apparatuses have been widely known and put to practical use. For example, JP-A-61-3
Various types of flash welding devices are disclosed in Japanese Patent Application Laid-Open No. 0287, Japanese Patent Application Laid-Open Nos. 62-286682 and 64-66073, and the like. As shown in FIG. 12A, a conventional general flash welding method is to grip two opposed workpieces a and b with a fixed clamp c and a movable clamp d, respectively, and further attach a fixed electrode e and a movable electrode f. As shown in FIG. 1, a large current is intermittently supplied between the two workpieces a and b.
As shown in FIG. 2B, the ends of the two workpieces a and b are heated by a flash in which the ends of the workpieces abut against each other (flash step), and then the heated ends of the workpieces a and b are pressed in the axial direction of the workpiece ( (Upset process).

Conventionally, a clamp frame is used as an apparatus for performing the above-described flash welding, and a clamp jack installed on the frame is used to grasp a workpiece to be welded and execute a flash step and an upset step. Have been. FIG. 13 shows a conceptual diagram of a method of gripping and pressurizing the workpiece by the clamp frame.

[0004]

The object of application of the conventional flash device is generally a member having a relatively small cross section, such as a pipeline, a railway rail, or a mechanical part. In addition, since smoothness of the product is required and a large amount of welding is required in a short time, as shown in FIG. 13, the two workpieces a and b are firmly gripped by the clamps c and d ( Clamping), and based on the frictional force (reaction force), the pressing force in the upset process is applied by a hydraulic jack. The pressing force in the upset process is 50
About N / mm ² is generally required.

[0005] However, when flash welding a steel member having a large cross section such as a column or a beam for construction, a very large pressing force is required, and the force for gripping the material to be welded is inevitably large. It increases in proportion to that.

More specifically, when the friction coefficient of the grip portion is 0.3, a grip force Q that is 3.3 times the pressing force P required for the flash welding upset process is required. In one example of a high-rise steel structure, the cross-sectional area of the steel member is 10
Since a 00cm ² mm, pressure P required for this member is about 5000KN. Therefore, in this case, the required gripping force Q is very large, about 16000 KN.

In general, a hydraulic device is used as a mechanism for gripping a material to be welded. Therefore, in order to obtain the large gripping force Q as described above, a large-capacity pump hydraulic unit or a large booster is required, which results in a large economic burden. On the other hand, the building members are mostly hollow members having a hollow structure, and there is also a problem that local buckling occurs when a large gripping force is applied as described above.

An object of the present invention is to apply flash welding of a large-section steel member for building to, for example, a method of building a steel column at a building site so that welding and joining of columns can be performed, and a gripping mechanism is provided. Eliminates the need for large-capacity pump hydraulic units and large boosters by eliminating the need for use, and solves the problem of local buckling of building members to be welded. It is another object of the present invention to provide a method for flash welding of a large-section steel member for construction, which is expensive.

[0009]

As a means for solving the above-mentioned problems of the prior art, a flash welding method according to the first aspect of the present invention is to join large-section steel members for building by flash welding. A method wherein a reaction plate or reaction band is attached to a large section steel member to be welded and a plurality of linear drive actuators are provided between the reaction plates or reaction bands of the two large section steel members to be welded. The power supply electrode is attached to each large-section steel member, and the joints are butt-welded by applying pressure by synchronized displacement control for the flushing process and the upset process by the actuator. .

According to a second aspect of the present invention, in the flash welding method according to the first aspect, the reaction plate or the reaction band is attached to the large-section steel member for building by welding or bolting. I do.

According to a third aspect of the present invention, in the flash welding method according to the first aspect, when the large-section steel member for building is a column, the reaction force plate also serves as an erection piece. One end of the actuator is connected to the reaction plate at the upper end of the column, and the connection is made by connecting the reaction plate at the lower end of the same column to the other end of the actuator when the next node is to be built. The adjustment is performed using the actuator, and then butt welding is performed.

[0012]

1 and 3 show a first embodiment of the present invention.
3 shows an embodiment corresponding to an H-section steel of the flash welding method according to the inventions described in Nos. 1 to 3; This shows a case where flash welding applied to butt welding of large-section steel members for construction, particularly a case where the large-section steel members to be welded are H-shaped steel columns 1 and 2.

The flash welding apparatus is configured such that reaction force plates 3 which stand vertically in the axial direction of the material are respectively mounted at the center of the flange near the welded portion 10 of the upper and lower H-shaped steel columns 1 and 2.
The reaction plates 3, 3 which are vertically opposed to each other, are mutually connected by a linear drive type actuator 5 and a pin mechanism 4. The electrode 6 for supplying power to each of the H-shaped steel columns 1 and 2 is separately and directly attached.

In the illustrated example, the reaction force plate 3 is attached by welding 7, but can be attached by means such as high-strength bolting as long as the reaction force against the pressing force at the time of upsetting can be secured. Described invention).

In the pin mechanism 4, the connection between the actuator 5 and the reaction force plate 3 is electrically insulated so that no current flows through the actuator 5. As the means, an insulating pin or an insulating bolt covered with an insulating material such as ceramic or epoxy resin is used. The insulating pins or the insulating bolts are tightly connected to the reaction force plate 3 in a configuration that does not cause backlash in the axial direction of the actuator 5 so as to prevent spark generation and enable fine control of displacement by the actuator 5.

The actuator 5 is, for example, a hydraulic cylinder capable of displacement control by synchronous control, for example, and is configured to be capable of synchronous displacement control for a flushing process and an upset process. The displacement of the H-shaped steel columns 1 and 2 is also prevented by controlling the displacement of each actuator 5.

More specifically, as shown in FIG. 4 as an example of a control system, the actuator 5 includes a servo valve 11 and a displacement sensor 12 such as a potentiometer for detecting a stroke. A processing device 13 such as a personal computer for processing the measurement signal of the displacement sensor 12, and all actuators 5 in accordance with instructions from the processing device 13
And a servo controller 14 that performs servo control so that the displacements of the control signals are the same. In the flash process, it is necessary to give a vibration of about 10 Hz,
At this time, control is performed so that the displacement is the same. However, individual displacement control of the actuator 5 is also possible when correcting the displacement of the H-shaped steel columns 1 and 2 and adjusting the erection accuracy.

In the case of the illustrated example, the electrode 6 has a band-type configuration wound directly around the outer periphery of the H-shaped steel columns 1 and 2, and is attached to a portion closer to the joint surface (welding position) 10 than the reaction force plate 3. However, the present invention can also be implemented with a structure such as a laundry pinch.

In the flash welding apparatus constructed as described above, when the large-section steel member for building is a column, each reaction force plate 3
Shall also serve as an erection piece. And
The lower end of the actuator 5 is connected to the reaction plate 3 at the upper end of the H-shaped steel column 2 in the preceding section (lower) in advance by a pin, and the lower end of the H-shaped steel column 1 is mounted when the H-shaped steel column 1 in the next section (upper) is assembled. The force plate 3 and the upper end of the actuator 5 are connected and connected. The adjustment of the insertion of the pillar 1 in the next section is also performed by the displacement control of each actuator 5, and then, the flash process and the upset process are performed by applying pressure by the synchronized displacement control of the actuator 5, and the butt welding of the joint surface 10 is performed. Item 3)).

Of course, if necessary, butt welding between horizontal steel beams can be similarly performed by the flash welding method described above. 5 and 6 show an embodiment corresponding to a circular steel pipe. Although the basic configuration is the same as the above-described examples of FIGS. 1 to 3, reaction force plates 3 are attached one by one in four directions at right angles to the outer periphery of the circular steel tube columns 1A and 2A by welding 7, and the opposite arrangements are provided. The force plates 3 are connected to each other by four actuators 5.

FIGS. 7 and 8 show an embodiment corresponding to a square steel pipe. Again, the basic configuration is the same as in the example of FIGS. 1 to 6, but one reaction force plate 3 is attached by welding 7 to each central position of the four peripherals of the square steel tube columns 1B and 2B, and the opposite arrangements The force plates 3 are connected to each other by four actuators 5.

Next, FIGS. 9 and 10 show an embodiment corresponding to a circular steel pipe and using a reaction force zone 13. FIG. The reaction belt 13 is made of a steel strip having a thickness of about 10 mm and made of steel pipe columns 1A and 2A.
And fixed by continuous fillet welding. However, high-strength bolting and the like can be adopted as described above.

The reaction zones 13, 13 attached to the upper and lower steel pipe columns 1 A, 2 A are connected to each other by clamps 14 of a plurality of actuators 5. As shown in FIG. 11 in detail, a clamp 14 having a socket slightly larger than the width of the reaction band 13 bites into the reaction band 13 and an actuator is used as a means for adjusting the gap S due to the difference in width between the two. The adjustment bolt 15 is screwed in parallel to the longitudinal direction of the screw 5, so that a tight and tight joint is performed. As a means for electrically insulating between the actuator 5 and the reaction band 13, an insulating material 16 is laid between the socket of the clamp 14 and the reaction band 13, and an insulating bolt is used as the adjustment bolt 15. . In some cases, the clamp 14 is made of an insulating material.

Therefore, current is prevented from flowing through the actuator 5, spark generation is prevented, and fine displacement control by the actuator 5 becomes possible. In addition, it is also preferable to provide the reaction belt 13 with a convex portion for fixing and firmly engaging the clamp 14.

[0025]

According to the flash welding method according to the first to third aspects of the present invention, flash welding of a steel member having a large section for a building is performed at a building site, for example, in a method of building a steel column. In addition to being able to perform welding and joining columns easily by applying it, there is no need to use a gripping mechanism for the material to be welded, eliminating the need for a large-capacity pump hydraulic unit or a large booster. Buckling problem does not occur.

In addition, as a result of being easily applicable to the construction work of a steel column, for example, at the construction site, the construction work and the work of setting adjustment and welding and joining can be rationally linked and efficiently performed, and It greatly contributes to the improvement of performance and accuracy, as well as economic efficiency.

[Brief description of the drawings]

FIG. 1 is an elevation view showing a first embodiment of a flash welding method according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG. 1;

FIG. 4 is an explanatory diagram of displacement control synchronized with an actuator.

FIG. 5 is an elevation view showing another embodiment of the flash welding method according to the present invention.

FIG. 6 is a sectional view taken along the line CC of FIG. 5;

FIG. 7 is an elevation view showing another embodiment of the flash welding method according to the present invention.

8 is a sectional view taken along the line DD of FIG. 7;

FIG. 9 is an elevation view showing another embodiment of the flash welding method according to the present invention.

FIG. 10 is a sectional view taken along line EE of FIG. 9;

FIG. 11 is a detailed view of the clamp mechanism of FIG.

12A to 12C are explanatory views showing main steps of a conventional general flash welding.

FIG. 13 is a conceptual diagram of a gripping mechanism for a workpiece.

[Explanation of symbols]

 1, 2 H-section steel (large-section steel member) 1A, 2A Circular steel pipe (large-section steel member) 1B, 2B Square-shaped steel pipe (large-section steel member) 3 Reaction plate 13 Reaction band 5 Actuator 6 Electrode

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Haruo Hoshino 1-5-1, Otsuka, Inzai City, Chiba Pref. Inside the Technical Research Institute, Takenaka Corporation (72) Inventor Toshiaki Tsuchiya 8-21-1, Ginza, Chuo-ku, Tokyo No. Takenaka Corporation Tokyo Main Store (72) Inventor Takashi Matsumaru 8-21-1, Ginza, Chuo-ku, Tokyo Inside Tokyo Main Store (72) Inventor Takayuki Miwa Naka Nagoya, Aichi Prefecture 1-18-22 Nishiki, Ward Nagoya Branch of Takenaka Corporation

Claims (3)

[Claims] 1. A method for joining large-section steel members for building by flash welding, comprising: attaching a reaction plate or a reaction band to the large-section steel members to be welded; and welding the two large-section steel members. The reaction force plate or the reaction force band is interconnected by a plurality of linear drive type actuators, and a power supply electrode is attached to each large-section steel member,
A method for flash welding, characterized in that a butt welding of a joint surface is performed by applying pressure by synchronized displacement control for a flash step and an upset step by the actuator. 2. The flash welding method according to claim 1, wherein the reaction plate or the reaction band is attached to the large-section steel member for building by welding or bolting. 3. When the large-section steel member for building is a column, the reaction plate is also used as an erection piece, and one end of the actuator is connected to the reaction plate at the upper end of the column in the previous section. At the time of building, the reaction plate at the lower end of the same column is connected and connected to the other end of the actuator, and the setting of the column in the next section is adjusted using the actuator, and then butt welding is performed. The method of flash welding according to claim 1, wherein