JP7002385B2 - Welding method for box columns and box columns - Google Patents

Description

The present invention relates to a box column and a method for welding a box column.

Conventionally, as a method of welding a box column to a steel material, a tab is arranged in a groove formed in an axial opening of the box column, two opposite sides of the opening are welded, and then the other of the opening is used. Those that weld two sides are known (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 6-297144

In the method of welding a box column described in Patent Document 1, each side of the opening is partitioned by a ceramic tab, and then each side is welded. In this case, in addition to the ceramics remaining on the contact surface of the weld seam that abuts on the tab, unevenness occurs on the contact surface, so that welding defects occur if welding is performed as it is. Therefore, it is necessary to finish the contact surface of the welded seam with arc air gouging, a grinder, or the like, which causes a problem of poor work efficiency.
Another method for welding box columns is to partition each side of the opening with a steel tab and then weld each side. In this case, since the chemical composition of the tab is changed by welding, it is necessary to remove the tab by gouging or grinding, which causes a problem of poor work efficiency.

An object of the present invention is to provide a box column and a method for welding a box column that can improve the welding work efficiency.

The box pillar of the present invention has a first groove formed on the first side of the opening in the axial direction and a second opening formed on the second side adjacent to the first side of the opening. It is provided with a tip, a partition portion that separates the first groove and the second groove in the circumferential direction of the opening, and the partition portion is configured by the axial end portion of the box pillar. It is characterized by that.

According to the present invention, since the partition portion separating the first groove and the second groove is formed by the axial end portion of the box column, it is necessary to remove the partition portion by gouging or the like after welding the groove. Welding work efficiency can be improved.

In the box pillar of the present invention, the axial end edge of the partition portion is linear when viewed from the axial direction, and the first groove and the second groove are linear with respect to the partition portion. It is preferable that they are adjacent to each other across the edge.

According to the present invention, since the first groove and the second groove are adjacent to each other with the linear end edge of the partition portion interposed therebetween, the weld seam of the first groove and the weld seam of the second groove are connected to each other. Therefore, sufficient welding strength can be ensured.

In the box pillar of the present invention, it is preferable that the first groove is extended along the first side portion and the end portion in the extending direction is opened in the extending direction.

According to the present invention, since the end portion of the first groove in the extension direction is open in the extension direction, the end portion of the first groove in the extension direction can be easily welded, and the welding can be performed. Work efficiency can be further improved.

The method for welding a box column of the present invention is the above-mentioned welding method for a box column for welding the box column of the present invention to a steel material, and a backing metal protruding from the opening of the box column is applied to the opening. A step of welding, a step of arranging a backing material on one of the first groove and the second groove, a step of welding one of the first groove and the second groove to the steel material, and the above-mentioned step. It is characterized by comprising a step of removing the backing material from one of the first groove and the second groove, and a step of welding the other of the first groove and the second groove to the steel material. And.

According to the present invention, even if there is a root gap due to the backing metal, by arranging the backing material on one of the first groove and the second groove, it is possible to prevent the occurrence of defects in the weld seam. Further, since the exposed area of the backing material as seen from one groove side is small and the contact area of the welded seam with the backing material is small due to the presence of the partition portion, it is not necessary to correct the contact surface by gouging or the like. .. Therefore, it is possible to improve the work efficiency of welding while preventing the occurrence of defects in the welding seam.

The perspective view of the box pillar which concerns on one Embodiment of this invention. The exploded perspective view which shows the welded structure of the box pillar of FIG. An enlarged cross-sectional view showing the welded structure of FIG. 2. The perspective view which shows the welding procedure in the welding structure of FIG. The perspective view which shows the welding procedure in the welding structure of FIG. The perspective view of the box pillar which concerns on the modification of this invention. The exploded perspective view which shows the welded structure of the box pillar which concerns on the modification of this invention. An enlarged cross-sectional view showing the welded structure of FIG. 7.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
In FIGS. 1 and 2, the box column 1 is a square tubular steel pipe in which four steel plates are welded to each other. The box pillar 1 includes skin plates 2A and 2B, square steel 3 (see FIG. 1), an end face portion 4 (see FIG. 2), and an opening 5. A backing metal 6 projecting from the opening 5 is welded into the opening 5.

The skin plates 2A and 2B form a side surface portion of the box pillar 1. Of these, the pair of facing skin plates 2A constitutes the flange surface portion of the box pillar 1, and the other pair of facing skin plates 2B constitute the web surface portion of the box pillar 1. For the skin plates 2A and 2B, for example, SM490 material or SN490 material is used.

The square steel 3 is a rod-shaped backing metal welded to the four inner corners of the box pillar 1 and extends in the axial direction of the box pillar 1. The square steel 3 is shorter than the length of the box pillar 1 on both ends in the axial direction of the box pillar 1. The material of the square steel 3 is not particularly limited, but a steel material having the same characteristics as the box pillar 1 or a steel material having the same characteristics as the box pillar 1 is preferable.

The end face portion 4 is provided on one end side in the axial direction of the box pillar 1 and closes the axial opening on the one end side. The material of the end face portion 4 is not particularly limited, but a steel material having the same characteristics as the box pillar 1 or a steel material having the same characteristics as the box pillar 1 is preferable.

The opening 5 is provided on the other end side of the box column 1 in the axial direction, and forms the opening 5A in the axial direction on the other end side. The opening 5 is composed of a pair of first side portions 51 facing each other across the opening 5A and a pair of second side portions 52 facing each other at right angles to the first side portion 51 across the opening 5A. Will be done. The opening 5 includes a first groove 53, a second groove 54, and a partition portion 55.

The first groove 53 and the second groove 54 are formed by mechanical grinding with a cutter, grinding machine, drill or the like, or thermal cutting such as gas cutting, plasma cutting, laser cutting or the like. The first groove 53 and the second groove 54 may be formed on the skin plates 2A and 2B before the box pillar 1 is manufactured, or may be formed on the opening 5 after the box pillar 1 is manufactured. good.

The first groove 53 is formed on the first side portion 51 of the opening 5. The first groove 53 is extended along the first side portion 51, and both ends in the extension direction are open in the extension direction. In the case of the present embodiment, an inclined surface 53A is extended from one end to the other end in the extending direction of the end portion at the axial end portion of the skin plate 2A, and the inclined surface 53A constitutes the first groove 53. Will be done.

The second groove 54 is formed on the second side portion 52 of the opening 5. The second groove 54 has an inclined surface 54A extending along the second side portion 52 and a flat rising surface 54B rising in the axial direction of the box pillar 1 from both ends of the inclined surface 54A in the extending direction. I have. The inclined surface 54A is formed up to the position of an extension surface extending the inner surface of the first side portion 51 in the second side portion 52, and the rising surface 54B is a plane along the extension surface. In the case of the present embodiment, an inclined surface 54A extends from one end to the other end in the extending direction of the end portion at the axial end portion of the skin plate 2B, and the rising surface 54B is formed by the inner surface of the skin plate 2A. To.

The partition portion 55 is formed by an axial end portion of the box pillar 1, and separates the first groove 53 and the second groove 54 in the circumferential direction of the opening 5. That is, the partition portion 55 is a base material of the box pillar 1 and is a part of the skin plates 2A and 2B. The axial end edge 55A of the partition portion 55 is the axial end edge of the box pillar 1 and forms a plane including the inner peripheral edge of the opening 5, that is, the first groove 53 and the second groove 54. It is located on the axial end face of the front box pillar 1. The edge 55A has a linear shape in which the inner peripheral edge of the opening 5 is extended along the first groove 53 when viewed from the axial direction of the box pillar 1, and the linear edge 55A is interposed therebetween. The first groove 53 and the second groove 54 are adjacent to each other.

The backing metal 6 is formed in a substantially square frame shape in a plan view. The material of the backing metal 6 is not particularly limited, but a steel material having the same characteristics as the box pillar 1 or a steel material having the same characteristics as the box pillar 1 is preferable.

Hereinafter, a procedure for welding the box pillar 1 to another box pillar 1 as a steel material will be described. As the welding at this time, various arc welding can be adopted.
First, as shown in FIG. 2, the box pillar 1 is arranged on the end face portion 4 of the lower box pillar 1 with the opening 5 of the upper box pillar 1 facing downward. At this time, the first groove 53 and the second groove 54 form a so-called re-shaped groove with respect to the end surface portion 4 of the lower box pillar 1. Further, as shown in FIG. 3, a backing metal protruding from the opening 5 of the upper box pillar 1 is provided between the opening 5 of the upper box pillar 1 and the end face portion 4 of the lower box pillar 1. According to 6, there is a root gap G1 of about 7 mm.

Next, as shown in FIG. 4, the ceramic backing material 7 is arranged close to one of the first grooves 53 in the pair of second grooves 54 of the upper box pillar 1. One of the first grooves 53 is welded to the lower box pillar 1. Since the welding of the first groove 53 is a linear lateral welding, it may be automatically welded by a welding robot or may be welded by an operator. After that, the backing material 7 is removed from the second groove 54. Similarly, in the pair of second grooves 54 of the upper box pillar 1, the backing material 7 is arranged closer to the other first groove 53 side, and the other first groove 53 is lowered. After welding to the box pillar 1 on the side, the backing material 7 is removed from the second groove 54. Next, one second groove 54 of the upper box pillar 1 is welded to the lower box pillar 1, and then the other second groove 54 of the upper box pillar 1 is welded to the lower box pillar 1. .. Since the welding of the second groove 54 is also linear lateral welding, it may be automatically welded by a welding robot or may be welded by an operator.

Here, since the partition portion 55 is composed of the end portion of the box pillar 1, the second groove 54 can be welded while the partition portion 55 remains after the first groove 53 is welded, and the partition portion 55 can be gouged or the like. No need to remove with. Further, due to the presence of the partition portion 55, the exposed area of the backing material 7 as seen from the first groove 53 side is small, and the area of the contact surface of the welded seam with respect to the backing material 7 is small. There is no need to correct it by gouging.

According to the above embodiment, since the partition portion 55 that separates the first groove 53 and the second groove 54 is formed by the axial end portion of the box pillar 1, the partition portion 55 is gouged or the like after welding. It is not necessary to remove it, and the work efficiency of welding can be improved.
Further, since the opening 5 can be welded while the partition portion 55 remains, the welding amount can be reduced.
Further, since the welding of the opening 5 can be realized only by the linear lateral welding, the box pillar 1 can be automatically welded by the welding robot.

Further, since the first groove 53 and the second groove 54 are adjacent to each other with the linear end edge 55A of the partition portion 55 interposed therebetween, the weld seam of the first groove 53 and the weld seam of the second groove 54 are adjacent to each other. Can be connected, so that sufficient welding strength can be secured.

Further, since the end portion of the first groove 53 in the extension direction is open in the extension direction, the end portion of the first groove 53 in the extension direction can be easily welded, and the welding work efficiency. Can be further improved.

Further, even if the root gap G1 due to the backing metal 6 exists, the occurrence of defects in the weld seam can be prevented by arranging the backing material 7 in the second groove 54. Further, since the exposed area of the backing material 7 seen from the second groove 54 is small and the contact area of the welded seam with the backing material 7 is small due to the presence of the partition portion 55, the contact surface is corrected by gouging or the like. There is no need. Therefore, it is possible to improve the work efficiency of welding while preventing the occurrence of defects in the welding seam.

The present invention is not limited to the above-described embodiment, and modifications, improvements, and the like to the extent that the object of the present invention can be achieved are included in the present invention.
For example, the backing material 7 may not be arranged in the second groove 54, but the backing material 7A may be arranged in the first groove 53 as shown in FIG. As shown in FIG. 5, the backing material 7A has a shape that matches the first groove 53. In this case, the second groove 54 may be welded first, the backing material 7A may be removed from the first groove 53, and then the first groove 53 may be welded.

As shown in FIG. 6, the opening 5 may include a first groove 56, a second groove 57, and a partition portion 58.
The first groove 56 is a flat or concave surface that rises from both ends of the inclined surface 56A extending along the first side portion 51 in the extending direction of the inclined surface 56A toward the corner of the outer peripheral edge of the opening 5. It is provided with a vertical rising surface 56B.
The second groove 57 is a flat or concave surface that rises from both ends of the inclined surface 57A extending along the second side portion 52 in the extending direction of the inclined surface 57A toward the corner of the outer peripheral edge of the opening 5. It is provided with an upright surface 57B.
The axial end edge 58A of the partition portion 58 is a straight line extending the diagonal line of the inner peripheral edge of the opening 5, and is on a plane including the inner peripheral edge of the opening 5, that is, the first groove 53 and the second groove. It is located on the axial end face of the box pillar 1 before forming the 54.

The opening 5 may include a first groove 53 and a second groove 57 that replaces the second groove 54. In this case, the rising surface 57B of the second groove 57 may be configured to rise toward the corner of the partition portion 55 (the tip of the edge 55A).
The shapes of the first groove 53 and the second groove 54 may be interchanged with each other, the first groove 53 has the shape of the second groove 54, and the second groove 54 has the shape of the first groove 53. It may be shaped.
The inclined surfaces 53A, 54A, 56A, 57A may have a curved surface.
The rising surfaces 54B, 56B, 57B may have a curved surface.
The end edges 55A and 58A of the partition portions 55 and 58 may be curved or wavy when viewed from the axial direction of the box column 1.

The back allowance 6 is not necessary. In this case, as shown in FIG. 7, square steels 3 may be extended to both ends of the box pillar 1 in the axial direction, and spacers 8 may be arranged between the square steels 3 of the upper and lower box pillars 1. As shown in FIG. 8, a root gap G2 of about several mm, for example, 3 mm is provided between the opening 5 of the upper box pillar 1 and the end surface of the lower box pillar 1 by the spacer 8, and the box is provided. The pillar 1 can be back wave welded.

The material of the backing material 7 is not limited, and for example, flux backing or a copper plate may be used.
The sizes of the root gaps G1 and G2 are not limited to the values shown in the embodiments.

The box pillar 1 can be welded in any posture, and for example, downward welding or vertical welding may be performed.
The box pillar 1 may be welded to the side surface portion of another box pillar 1.
The steel material for welding the box column 1 is not limited, and may be, for example, a column column, a steel plate, a diaphragm, or an H-shaped steel.
The box pillar 1 may be a triangular cylinder or a cylinder having a pentagon or more.

1 ... box pillar, 5 ... opening, 6 ... backing metal, 7 ... backing material, 51 ... first side, 52 ... second side, 53 ... first groove, 54 ... second groove, 55 ... partition, 55A ... edge.

Claims (4)

It ’s a box pillar,
The first groove formed on the first side of the axial opening,
A second groove formed on a second side adjacent to the first side of the opening, and a second groove.
A partition portion that separates the first groove and the second groove in the circumferential direction of the opening is provided.
The partition portion is a box pillar characterized by being formed by the axial end portion of the box pillar. The axial end edge of the partition is linear when viewed from the axial direction.
The box pillar according to claim 1, wherein the first groove and the second groove are adjacent to each other with the linear end edge of the partition portion interposed therebetween. The first aspect according to claim 1 or 2, wherein the first groove is extended along the first side portion and the end portion in the extending direction is opened in the extending direction. Box pillar. The method for welding a box column according to any one of claims 1 to 3, wherein the box column is welded to a steel material.
The step of welding the backing metal protruding from the opening of the box pillar to the opening, and
The step of arranging the backing material on one of the first groove and the second groove, and
A step of welding one of the first groove and the second groove to the steel material, and
A step of removing the backing material from one of the first groove and the second groove, and
A method for welding a box column, which comprises a step of welding the other of the first groove and the second groove to the steel material.

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