Welded joint part and method for forming welded joint part

Abstract

To provide a welded joint part and a method for forming the welded joint part.SOLUTION: In a welded joint part according to the present invention, a lower column and an upper column which are constituted of columns for architectural constructions are welded to each other, where cut traces derived from erection pieces arranged prior to welding exist at corner parts of an upper end part of the lower column and at corner parts of a lower end part of the upper column. It is preferable that the upper end part of the lower column constituted of the columns for architectural constructions and the lower end part of the upper column constituted of the columns for architectural construction are butted and welded to each other by welded parts formed around the butted portions, in a state where a groove surface formed on at least either of a peripheral surface of the lower end part of the upper column and a peripheral surface of the upper end part of the lower column is intervened between the upper end part of the lower column and the lower end part of the upper column.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] FIELD OF THEINVENTION The present invention relates to a weld joint and a method for forming a weld joint. [Background technology]

[0002] On-site robot welding used at construction sites allows the robot weight and performance to be set as desired, but because the welding robot is installed on steel scaffolding, there are limitations to the robot's portability and the welding work that can be performed depending on the robot's performance. For example, currently, it is very difficult to weld the corners of architectural structural columns using welding robots, and the commonly used welding method is to use a welding robot to weld the straight sections, a skilled welder to weld the corners, and then a skilled welder checks the weld joints. Here, "architectural columns" refer to square steel pipe columns and welded box columns. Also, "corner" is a concept that includes the part where adjacent sides of an architectural structural column are connected, for example, the part that forms a right angle or a chamfered corner.

[0003] However, when welding the entire circumference of a steel pipe column, including its corners, using a welding robot, there are several problems that need to be solved. "1" The problem of welding defects occurring at the bead joint bordering the erection piece located in the center of the column width. “2” The problem of difficulty in setting the conditions for starting subsequent welding due to the uneven shape of the start and end points of the preceding welding at the corners. ``3'' The problem of welding defects occurring at the bead joints formed at the corners.

[0004] For example, consider the case where a lower column 10A and an upper column 11A, which are welded box-shaped cross-section columns as shown in FIG. 7(b), are welded together by a welding robot 33. To perform welding, first, at the lower end of the upper column 11A, a welding robot 33 is installed so as to be freely movable along each of the linear guide rails 30A provided on the outside of two opposing side surfaces. The guide rails 30A are supported by rail supports 34A attached to the side surfaces of the column. The lower column 10A and the upper column 11A are temporarily fixed by sandwiching the erection pieces 12, 12 attached near their butt joints with a splice plate 13 and screwing a nut 16 onto a connecting bolt 15 that passes through them. In the case of a welded box section column, a welding robot 33 is installed on each of the two opposing side surfaces, and the two welding robots 33 are used to perform linear welding simultaneously. In addition, in the case of the square steel pipe column shown in Figure 7 (a), a guide rail 30 is provided around the lower end of the upper column 11, and two welding robots 33 are installed around the guide rail 30 to perform welding. As described above, the welding robot 33 performs welding while moving linearly along the guide rail 30A or rotating along the guide rail 30, thereby welding the lower column and the upper column.

[0005] By attaching an erection piece 12 for temporary fixing to the center of the width direction on the side of the lower column 10A and the upper column 11A, or the side of the lower column 10 and the upper column 11, for example, as shown in FIG. 10(a), when the architectural structural column 10A is loaded horizontally on the loading platform of a transport vehicle, the erection piece 12 can be prevented from interfering with other parts. In addition, when the erection piece 12 is used as a lifting jig to suspend a component with the wire rope Y, the number of hoisting jigs can be reduced and rotation of the component during suspension can be suppressed. In addition, welding to the column skin plate is easier for the flat plate portion than for the corner portion. In the above-mentioned case, when the welding robot 33 moving along the guide rail 30 performs welding, a weld bead seam inevitably occurs at the position of the erection piece 12. Since the welding pass is divided at the installation position of the erection piece 12, the number of welding steps increases at the joint, and there is a risk of welding defects occurring at the joint.

[0006] In addition, in a temporary fixing structure in which an erection piece 12 is provided at the center of each side surface of the lower column 10 shown in FIG. 8, the following welding method using two welding robots R is known. First, a ceramic tab 2 is placed at the corner of the lower column 10, and regions A and B between the tabs 2, 2 installed at diagonal positions of the lower column 10 shown in Fig. 8(a) and the erection piece 12 adjacent to these tabs 2 are welded. A welded portion 3 can be formed in region A, and a welded portion 4 can be formed in region B. Next, as shown in Fig. 8(b), area C adjacent to area A and area D adjacent to area B are welded. As shown in Fig. 8(c), weld 5 can be formed in area C, and weld 6 can be formed in area D. As a result, about half of the cross-sectional area of ​​the lower column 10 was welded, so the erection piece 12 was cut and the joints of the upper and lower erection pieces 12 were separated. The remaining areas E and F are opened, so the remaining areas E and F can be welded as shown in FIG. 8(c).

[0007] Conventionally, when welding upper and lower architectural structural columns using a welding robot, a technique is known in which the corners of the diagonal positions of the architectural structural columns avoiding the installation position of the erection piece are pre-welded as shown in Patent Document 1, and the remaining parts are subsequently welded after removing the erection piece.

[0008] In addition, when welding the upper and lower architectural structural columns in a temporarily fixed state, in a temporary fixing structure in which an erection piece 12 is provided similarly to the structure shown in FIG. 8, a welding method is known in which the area between the welded partition plate inserted into the corner of the architectural structural column described in Patent Document 2 and the erection piece is sequentially welded. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Patent Publication No. 2021-065899 [Patent Document 2] JP 2020-157361 A Summary of the Invention [Problem to be solved by the invention]

[0010] None of the conventional welding methods described with reference to Patent Documents 1 and 2 and FIG. 8 can solve the above-mentioned problems. In the conventional temporary fixing structure, the welding man-hours increase because the welding pass is divided at the installation position of the erection piece 12, and further, a preceding weld and a following weld are generated, so there is a risk of welding defects occurring at the joint. In addition, in the conventional welding method, the weld start and end points are provided at the corners of the welded box section column, which means that the weld start point is prone to weld defects such as poor penetration and blowholes, and the weld end point is prone to weld defects such as crater cracks. The occurrence of these welding defects is likely to result in delays in the welding construction period due to repair welding, and it is thought that there is a possibility that early weld fracture will be induced due to strain concentration at the weld defects.

[0011] The present invention has been made in consideration of the above-mentioned problems, and aims to provide a welded joint and a method for forming a welded joint that reduce the number of welding steps and make welding defects less likely to occur by devising the installation position of the erection piece. In addition, the present invention provides a welded joint and a method for forming a welded joint in which the installation position of the erection piece is devised, the welded joint in the vicinity of the installation position of the erection piece is eliminated, and the bead joints that were unavoidably formed in the conventional erection piece and the corners are integrated, thereby reducing the number of bead joints where welding defects may occur. [Means for solving the problem]

[0012] (1) In order to solve the above problems, one form of welded joint according to the present invention is a welded joint in which a lower column and an upper column, which are architectural structural columns, are welded together, and the corners of the upper end of the lower column and the corners of the lower end of the upper column have cutting marks due to the erection piece that was installed before welding. By adopting the above-mentioned structure, when welding the lower column and the upper column of an architectural structural column, the lower column and the upper column can be welded in a temporarily fixed state by the erection pieces attached to the corners of the upper end of the lower column and the lower end of the upper column.

[0013] (2) A welded joint according to one embodiment of the present invention is a welded joint in which an upper end of a lower column made of a column for architectural construction and a lower end of an upper column made of a column for architectural construction are welded together by butting the upper end of the lower column and the lower end of the upper column together with a groove surface formed on at least one of the peripheral surface of the lower end of the upper column and the peripheral surface of the upper end of the lower column between the upper end of the lower column and the lower end of the upper column, and the two linear welds adjacent to each other with a corner portion interposed therebetween are joined at a position other than the corner portion. The weld is made of weld metal that is continuous in a straight line without any seams, and of the two linear welds, one linear weld is an inner groove weld and the other linear weld is a full-length weld, the inner groove weld is a weld made of weld metal that is continuous in a straight line without any seams and that reaches the groove face position of the full-length weld, and the full-length weld is a full-length weld made of weld metal that is continuous in a straight line without any seams over the entire length of the column width in the direction along the column width, without any seams at any position other than the corner portion.

[0014] (3) In one form of welded joint according to the present invention, four adjacent linear welds separated by a corner portion are all welds made of continuous weld metal in a straight line without any seams at any position other than the corner portion, and a configuration can be adopted in which two of the four linear welds are the full-length welds and the remaining two are the groove welds.

[0015] (4) In one form of welded joint according to the present invention, four adjacent linear welds separated by a corner portion are all welds made of continuous weld metal in a straight line without any seams at any position other than the corner portion, and of the four linear welds, one is the full-length weld, one is the groove weld, and the remaining two are groove welds with one side of the weld start and end terminals reaching the groove face and root clearance position, and the other is weld metal continuing to the column plate end face. (5) In one embodiment of the welded joint according to the present invention, a configuration can be employed in which a seam is formed at a position where the inner groove weld contacts the full length weld.

[0016] (6) A method for forming a welded joint according to one embodiment of the present invention is characterized in that, when welding a lower column and an upper column which are architectural structural columns, an erection piece is provided at the corners of the upper end of the lower column and the lower end of the upper column. (7) In one embodiment of the method for forming a welded joint according to the present invention, an upper end of a lower column made of a column for architectural construction and a lower end of an upper column made of a column for architectural construction are provided, with a groove surface formed on at least one of the peripheral surface of the lower end of the upper column and the peripheral surface of the upper end of the lower column being interposed between the upper end of the lower column and the lower end of the upper column, the upper end of the lower column and the lower end of the upper column being butted together, and joined by a weld formed around the butt joint, and two linear welds adjacent to each other via a corner portion in the weld portion are both welds made of weld metal that is continuous in a straight line without having any seams at any position other than the corner portion, and of the two linear welds, one linear weld is a groove weld and the other linear weld is a groove weld. The linear weld is a full-length weld, and the groove weld is a weld made of weld metal that is continuous in a straight line without any seams and reaches the groove face position of the full-length weld. The full-length weld is a full-length weld made of weld metal that is continuous in a straight line without any seams at any position other than the corner portion over the entire length of the column width in the direction along the column width. When forming the groove weld, weld metal is formed on the start and end sides so that it extends beyond the formation area of ​​the groove weld and reaches the formation area of ​​the full-length weld, and after removing the weld metal present in the formation area of ​​the full-length weld, the full-length weld is formed in the formation area of ​​the full-length weld over the entire length of the column width.

[0017] (8) In one embodiment of the method for forming a welded joint according to the present invention, when forming the full-length weld over the entire column width in the formation area of ​​the full-length weld, end tabs that imitate the upper end shape of the lower column, the lower end shape of the upper column, and the shape of the groove surface, which correspond to the formation area of ​​the full-length weld, are provided at the start and end sides of the formation area of ​​the full-length weld, at outer positions beyond the formation area of ​​the full-length weld, and weld metal is provided beyond the formation area of ​​the full-length weld to the area of ​​the end tab, and the full-length weld is formed by removing the portion of the weld metal formed in the area of ​​the end tab.

[0018] (9) In a welding method according to one embodiment of the present invention, it is preferable to use, as the end tabs, a first tab body, a second tab body, and a third tab body that imitate the shapes of an end face, a groove face, and a root spacing formed on at least one of a peripheral surface of a lower end of the upper column and a peripheral surface of an upper end of the lower column. Effect of the Invention

[0019] The present invention provides a welded joint in which the lower column and the upper column are welded around their butts by attaching an erection piece to the corners of the upper end of the lower column and the lower end of the upper column. The welded joint is made of a full-length weld that is continuous in a straight line without any seams at any position other than the corners, and an inner-groove weld that reaches the groove face position of the full-length weld. This reduces the welding man-hours and provides a welded joint with a low incidence of weld defects. [Brief description of the drawings]

[0020] [Figure 1] 1A and 1B are partial cross-sectional views for explaining an outline of a welding method and a welded joint according to a first embodiment of the present invention, in which (a) is a cross-sectional view showing a state in which a weld is formed in two regions at the butt joint between an upper column and a lower column, (b) is a cross-sectional view showing a state in which the ends of the welds formed in the two regions have been processed, and (c) is a cross-sectional view showing a state in which welds are formed in the remaining two regions, the erection piece and the end tab are cut, and the welded joint is completed. [Diagram 2] 1A and 1B are diagrams for explaining the welding method of the first embodiment, in which (a) is a perspective view showing the installation state of the erection piece and the end tab at the butt portion and the corner portion of the upper column and the lower column, (b) is a side view showing the same state, and (c) is a side view showing the weld formed at the butt portion of the upper column and the lower column. [Diagram 3]1A shows a corner portion of the butt portion of a lower column and an upper column in the welding method of the first embodiment, where (a) is an oblique view showing an image of a solid tab being attached to the corner portion, (b) is a front view showing the solid tab at the corner portion of the lower column and the upper column, (c) is a right side view of the same corner portion, (d) is a front view showing the setback state of the solid tab, and (e) is a side view showing the setback state of the solid tab. [Figure 4] 1A shows a corner portion where a lower column and an upper column butt together in the welding method of the first embodiment, where (a) is a perspective view showing an image of an end tab being attached to the corner portion, (b) is a front view showing the end tab at the corner portion, and (c) is a right side view showing the end tab at the corner portion. [Diagram 5] 10A and 10B are partial cross-sectional views for explaining a welding method and a welded joint of a second embodiment of the present invention, in which (a) is a cross-sectional view showing a state in which a weld has been formed in two regions at the butt joint between an upper column and a lower column, (b) is a cross-sectional view showing a position for forming a weld continuing from the two regions, and (c) is a cross-sectional view showing a state in which a weld has been formed in the remaining two regions to complete the welded joint. [Figure 6] 1A and 1B are perspective views showing second and third examples of the mounting state of the erection piece in the welding method according to the present invention, where (a) is a perspective view showing the second example, and (b) is a perspective view showing the third example. [Figure 7] FIG. 11 is a perspective view to explain the state in which an upper column equipped with an erection piece and a lower column are welded by a welding robot, where (a) is a perspective view in the case of a square steel pipe column, and (b) is a perspective view in the case of a welded-assembled box section column. [Figure 8] FIG. 1 is a diagram for explaining an example of a conventional welding method, in which (a) is a cross-sectional view showing the state where two areas that do not interfere with the erection piece are welded, (b) is a cross-sectional view showing the state where a weld is formed in an area adjacent to an area where a weld was previously formed, and (c) is a cross-sectional view showing the state where the remaining part is welded. [Figure 9] 11A and 11B are explanatory diagrams showing other embodiments of the present invention, where (a) is an explanatory diagram showing a welded joint of a third embodiment, (b) is an explanatory diagram showing a welded joint of a fourth embodiment, and (c) is an explanatory diagram showing a welded joint of a fifth embodiment. [Figure 10] This shows the hanging state of a column for architectural structure, where (a) shows the case where the erection piece is installed in the center of the column width direction, and (b) shows the case where the erection piece is installed in the corner of the column. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In the drawings used in the following description of the embodiments, characteristic parts may be enlarged or otherwise emphasized for the sake of clarity. In addition, the same reference numerals may be used to designate common components in the description of the embodiments, and the description of the components with the same reference numerals may be simplified or omitted.

[0022] "First embodiment" Hereinafter, a first embodiment embodying a welded joint and a method for forming the same according to the present invention will be described with reference to Figs. 1 to 4 and 7. The lower column and upper column to be joined in the welded joint and its forming method in the first embodiment are the lower column 20 and upper column 21 shown in Figure 1 or Figure 2, which are architectural structural columns erected at a construction site in the same manner as the lower column 10 and upper column 11 shown in Figure 7. In the example shown in FIG. 7, the erection piece 12 was formed at the center of the upper end of the side of the lower column 10 and the center of the lower end of the side of the upper column 11, but in this embodiment, the erection piece 22 is attached to the upper end corner of the side of the lower column 10 and the lower end corner of the side of the upper column 11.

[0023] "Configuration of upper and lower columns and erection piece" As shown in Figures 1 and 2, the lower column 20 is a welded box-shaped section column assembled by combining and welding multiple skin plates. As an example, as shown in Figure 2(a), the lower column 20 is composed of a welded box-shaped section column integrated by joining multiple skin plates via column body welds 20a, 20a. Similarly, the upper column 21 is composed of a welded box-shaped cross-section column that is integrated by joining multiple skin plates via column body welds 21a, 21a. Note that while Figures 2(a) and 2(c) depict the column body welds 20a, 21a of the lower column 20 and the upper column 21, Figure 1 omits the depiction of the column body weld 20a and shows only the general shape of the lower column 20 viewed from above.

[0024] 1(a), when the lower pillar 20 is viewed from above, it is composed of side surface 20A located on the left side and side surfaces 20B, 20C, and 20D which are sequentially arranged in a counterclockwise circumferential direction of the lower pillar 20 starting from side surface 20A. Side surface 20B is arranged to form an intersecting angle of 90° with side surface 20A, side surface 20C is arranged to form an intersecting angle of 90° with side surface 20B, and side surface 20D is arranged to form an intersecting angle of 90° with side surface 20C. 1 and 2 show side surfaces 20A, 20B, 20C, and 20D that constitute lower column 20, and side surfaces 21A and 21B that constitute upper column 21, but side surfaces 21C and 21D are on the reverse side of Fig. 2(a) and cannot be shown in Fig. 2(a). For this reason, it is assumed in Fig. 1 that upper column 21 exists above lower column 20, and reference symbols in parentheses are added after the reference symbols showing side surfaces 20A, 20B, 20C, and 20D of lower column 20 to indicate that side surfaces 21A, 21B, 21C, and 21D that constitute upper column 21 exist above them.

[0025] When the lower column 20 and the upper column 21 are large, the lower column 20 and the upper column 21 are welded box-shaped section columns in which multiple skin plates are welded together, but in this embodiment, the lower column 20 and the upper column 21 to be welded together may be one body or a joint of multiple skin plates. For this reason, the structure of the lower column 20 is shown in a simplified manner in Figure 1, omitting the main body welds, etc. As shown in FIG. 2(a), the upper end of the lower column 20 has an upper end surface 20b that is a horizontal plane, and the lower end of the upper column 21 has a groove surface 21b that is a slope. The groove surface 21b is formed of downward slopes formed so that the thickness of each of the lower ends of the side surfaces 21A, 21B, 21C, and 21D gradually decreases. The inclination angle of each groove surface 21b is, for example, about 55° with respect to the surface of one of the side surfaces 21A, 21B, 21C, and 21D adjacent to the groove surface 21b.

[0026] As shown in FIG. 2(a), an erection piece 22 having a U-shape when viewed from the side is provided, which connects an upper corner portion of the side surface 20A of the lower column 20, close to the side surface 20B, and a lower corner portion of the side surface 21A of the upper column 21, close to the side surface 21B. The erection piece 22 is formed of a rectangular plate-shaped lower mounting piece 22a fixed to the lower column 20 and an L-shaped mounting piece 22b fixed to the upper column 21. The lower mounting piece 22a is fixed to the side surface 20A with about half of one side in contact with the surface of the side surface 20A and about the remaining half of one side protruding laterally from the side edge of the side surface 20A. The upper mounting piece 22b is fixed to the side surface 21A with about half of one side in contact with the surface of the side surface 21A and about the remaining half of one side protruding laterally from the side edge of the side surface 21A. The lower mounting piece 22a and the upper mounting piece 22b are fixed to the side surface 20A or the side surface 21A by a joining method such as thin-wall welding. 2(a) and (b), a thin weld 19 is depicted around the attachment portion of the lower attachment piece 22a and the upper attachment piece 22b.

[0027] In addition, a plate-shaped splice plate 23 is provided along the lower mounting piece 22a. An insertion hole 24 penetrating the splice plate 23 and the lower mounting piece 22a is formed in the portion of the splice plate 23 corresponding to the lower mounting piece 22a. An insertion hole 25 penetrating the splice plate 23 and the upper mounting piece 22b is formed in the portion of the splice plate 23 corresponding to the upper mounting piece 22b. These insertion holes 24, 25 are provided with connecting bolts so as to pass through them, and nuts are provided to be screwed onto the connecting bolts. By fastening these connecting bolts and nuts, the splice plate 23 is integrated with the erection piece 22, and the erection piece 22 is reinforced.

[0028] In addition, in Fig. 2(a), only the erection piece 22 and the splice plate 23 at the upper end corner of the side 20A of the lower column 20, which are closer to the side 20B, are shown. However, these are also provided at the upper end corner of the side 20A of the lower column 20, closer to the side 20D. In Fig. 2(b), the erection piece 22 and the splice plate 23 provided on both the left and right sides of the side 20A are shown, but in Fig. 2(a), only one side is shown for the sake of simplicity.

[0029] In the erection piece 22 shown on the left side of FIG. 2(b), the lower mounting piece 22a is attached to the side surface 20A so as to protrude leftward from the left edge of the side surface 20A, and the upper mounting piece 22b is attached to the side surface 21A so as to protrude leftward from the left edge of the side surface 21A. The state in which the left and right erection pieces 22 shown in FIG. 2(b) are arranged with respect to the side surface 20A is simply illustrated on both sides in the width direction of the side surface 20A shown on the left side in FIG. 1(a). In this embodiment, the same erection piece 22 as the above-mentioned erection piece 22 is provided on both sides of the side surface 20C in the width direction. Regarding the erection piece 22 provided on both sides of the side surface 20C in the width direction, only the installation position is simply shown in FIG. In addition, the lower column 20 and the upper column 21 are temporarily fixed by an erection piece 22 at a construction site or the like with their respective central axes aligned along the same vertical line.

[0030] "Welding Method Overview" In the welding method of this embodiment, weld metal is supplied around the area where the upper end of the lower column 20 and the lower end of the upper column 21 are butted together to form a weld, and the lower column 20 and the upper column 21 are welded together. As an overview of the welding method, the lower column 20 and the upper column 21, which are temporarily fixed by the erection piece 22 as shown in Figs. 1 and 2, are subjected to the first stage of welding using the solid tab 26, which will be described in detail later based on Fig. 3, and the two welding robots 33, which were previously described using Fig. 7. 1(a), in the first stage welding, a weld (inside groove weld) 27 is formed in region B between side surface 20B of lower column 20 and side surface 21B of upper column 21, and a weld (inside groove weld) 28 is formed in region D between side surface 20D of lower column 20 and side surface 21D of upper column 21. Since two welding robots 33 are used to weld region B and region D, region B and region D may be welded simultaneously, or region B and region D may be welded in this order or in the reverse order.

[0031] Here, as an example, a supplementary explanation will be given on the configuration of a welding robot for square steel pipes and the configuration of a welding robot for welded assembled box section columns. FIG. 7(a) shows an example of the configuration of a welding robot for square steel pipes, and FIG. 7(b) shows an example of the configuration of a welding robot for welded box section columns. As shown in FIG. 7(a), a ring-shaped guide rail 30 is attached slightly above the erection piece 12 of the upper column 11 so as to surround the circumference of the upper column 11 at a fixed distance from the peripheral surface of the upper column 11. The guide rail 30 is supported almost horizontally by a plurality of rail support parts 34 fixed to the side of the upper column 11 by means of bolt fastening or the like. A plurality of welding robots 33 (two in the example shown in FIG. 7(a)) are attached to the guide rail 30. The welding robots 33 are attached to the guide rail 30 so as to be movable around the circumference of the upper column 11 along the guide rail 30. The welding robots 33 are configured to be able to perform welding while moving linearly or circumferentially along the guide rail 30. For the lower column 20 and the upper column 21 of this embodiment, a welding robot 33 for welded box-shaped section columns shown in Fig. 7(b) can be used. A linear guide rail 30A is provided slightly above the erection piece 22 of the upper column 21 along the width direction of the side surface of the upper column 21 at a fixed interval from the side surface of the upper column 21. The guide rail 30A is supported almost horizontally by a plurality of rail support parts 34A fixed to the side surface of the upper column 21.

[0032] Welding robot 33 is equipped with a gripping part 35 that grips guide rail 30 or guide rail 30A, a main body part 36 attached to gripping part 35, and a welding torch 38 supported via a support mechanism 37 on the lower side of main body part 36. Welding robot 33 has the function of welding the butt portions of the lower column and the upper column with welding torch 38 while moving along guide rail 30 or guide rail 30A. The welding robot 33 may be of any configuration as long as it is a robot that can weld the butt portion of the lower column 20 and the upper column 21 while moving linearly or circling around the column along the guide rail 30 or the guide rail 30A. As an example, a multi-layer welding robot manufactured by MHI Solution Technologies Co., Ltd. can be used. When performing the welding work described below, it is preferable to use a welding robot 33 for welded assembly box section columns shown in FIG. 7(b), but a welding robot 33 moving along the guide rail 30 shown in FIG. 7(a) may also be used.

[0033] The area B to be welded in the first stage described above in Figures 1 and 2 is the area adjacent to the upper end surface 20b above the side surface 20B and the groove surface 21b of the upper column 21 above that, and can be described as the surrounding area of ​​the butt joint between the upper end of the lower column 20 and the lower end of the upper column 21. Region D is adjacent to the upper end surface 20b above the side surface 20D and the groove surface 21b of the upper pillar 21 above it, and can be described as the surrounding area of ​​the butt joint between the upper end of the lower pillar 20 and the lower end of the upper pillar 21.

[0034] After the first stage of welding is completed, the solid tab 26 is removed, and the start and end portions of the welds 27, 28 formed are trimmed to conform to the groove faces and root spacing of the sides 20A and 20C, respectively, and then the second stage of welding is performed using the end tab 40 and two welding robots 33, which will be described in detail later based on FIG. 4. In the second stage welding, as shown in Figures 1(b) to (c), a weld (full length weld) 41 is formed in area A between side 20A of the lower column 20 and side 21A of the upper column 21, and a weld (full length weld) 42 is formed in area C between side 20C of the lower column 20 and side 21C of the upper column 21.

[0035] As a result of the above, welds 27, 28, 41, and 42 can be formed around the butt joint between the upper end of the lower column 20 and the lower end of the upper column 21. If the welding of the first stage and the welding of the second stage are completed, as shown in Fig. 1(c), the welding operation of the lower column 20 and the upper column 21 can be completed by cutting all the erection pieces 22 and all the end tabs 40. The detailed structure of the solid tab 26 and the detailed structure of the end tab 40 will be described below, and the welding of the first stage and the second stage, which were only outlined above, will be described in detail.

[0036] "Structure of the solid tab" The solid tab 26 used for the welding of the first stage and its mounting state are shown in Fig. 3(a). The solid tab 26 is, for example, a three-dimensional structure made of ceramic, and is inserted between the corner of the lower column 20 and the corner of the upper column 21 as shown in Fig. 3(a). In other words, a solid tab 26 of a size that does not protrude from the corner is inserted at the corner where the upper end surface 20b of the side surface 20A and the upper end surface 20b of the side surface 20B intersect. The solid tab 26 consists of a first tab body 26A and a second tab body 26B. The first tab body 26A has a bottom surface 26a that is installed at the corner of the upper end surface 20b of the side surface 20A and the upper end surface 20b of the side surface 20B when the solid tab 26 is installed as shown in Fig. 3(a). The first tab body 26A has a side surface 26b that rises almost at a right angle from the bottom surface 26a and is flush with the surface of the side surface 20A, and a side surface 26c that rises at a right angle from the bottom surface 26a and is flush with the surface of the side surface 20B.

[0037] When the side surface 20A is viewed from the front as shown in Fig. 3(b), the first tab body 26A has an inclined surface 26d that is flush with the groove opening surface 21b located at the lower end of the side surface 21B. Also, at the lower end of the inclined surface 26d, there is a short side surface 26e that hangs down from this lower end and is connected to the edge of the bottom surface 26a. When the side surface 20B is viewed from the front as shown in Fig. 3(c), the first tab body 26A has an inclined surface 26f that is flush with the groove opening surface 21b located at the lower end of the side surface 21A. Also, at the lower end of the inclined surface 26f, there is a short side surface 26g that hangs down from this lower end and is connected to the edge of the bottom surface 26a.

[0038] The second tab body 26B has a bottom surface 26h that is installed at a corner portion adjacent to the first tab body 26A. The second tab body 26B has a side surface 26i and a slope 26j that receive the slope 26d and the short side surface 26e of the first tab body 26A on the portion from the bottom surface 26h to the first tab body 26A side. The second tab body 26B is installed at the corner portion with the inclined surface 26j aligned with the inclined surface 26d of the first tab body 26A. In addition, the first tab body 26A can slide along the upper end surface 20b of the side surface 20B relative to the second tab body 26B while the inclined surface 26j and the inclined surface 26d are aligned with each other.

[0039] "First stage welding" In the first stage of welding, welding robot 33 is used to form welds 27 and 28 as previously described with reference to Fig. 1(a). When forming welds 27 shown in Fig. 1(a), solid tab 26 is provided in the corner portion on the left end side of region B as shown in Figs. 3(a) to (c). 3, a solid tab 26 is also provided at the corner on the right end side of area B. The solid tab 26 is preferably attached using, for example, aluminum foil with adhesive. When forming the weld 27 as shown in FIG. 1(a) while supplying the weld metal along the region B by the welding robot 33, the first tab body 26A on the left end side of the region B is slightly moved in the direction of the arrow in FIG. 3(e) relative to the second tab body 26B to be in a setback state.

[0040] The moving distance when the setback state is established can be, for example, a distance that is approximately a fraction of the width of the bottom surface 26a of the first tab main body 26A shown in Fig. 3(e). The solid tab 26 provided on the right end side of the region B is also set back in a similar manner. By setting the first tab main bodies 26A, 26A of the solid tabs 26 at the left and right ends of the region B in a setback state, the region B can be expanded in the left and right direction.

[0041] With region B expanded, the welding robot 33 is operated to supply weld metal to the expanded region B along between the upper end surface 20b of the lower column 20 and the groove surface 21b of the upper column 21, forming a weld 27. Here, the weld metal is formed until it comes into contact with the first tab bodies 26A, 26A, both ends of which are in a setback state. Both ends of the weld metal formed until it contacts the first tab bodies 26A, 26A are formed to an area beyond the left and right end positions of the groove surface 21b above the side surface 20B. Therefore, the weld metal that has exceeded the left and right end positions of the groove surface 21b above the side surface 20B and reached the area of ​​the groove surface 20b and groove surface 21b above the side surface 20A is removed using a grinder or the like after welding. In addition, since the welding robot 33 forms the weld between the first tab bodies 26A, 26A by direct welding, input of welding condition information to the welding robot 33 becomes easy.

[0042] In the case of the setback state of the first tab main body 26A shown in Fig. 3(e), the weld metal is formed up to the area indicated by the multiple arrows in Fig. 3(e) indicating the movement associated with the setback of the first tab main body 26A. For this reason, the weld metal in the area indicated by the multiple arrows in Fig. 3(e) is removed, and the remaining portion is made into the welded portion 27. Although the solid tab 26 on the right end side of the groove surface 21b shown in Fig. 3(e) is omitted, the weld metal formed on the right end side of the groove surface 21b is also removed by grinding or the like in the same manner, and the remaining portion is made into the welded portion 27. When performing direct welding using welding robot 33, there is a problem that defects are likely to occur both at the starting end side when welding begins and at the ending end side when welding is completed. In this regard, the starting end side and the ending end side of welded portion 27 are removed according to the setback amount of first tab body 26A, so the risk of defects on the starting end side and the ending end side of welded portion 27 can be eliminated.

[0043] In addition, even in region D where welded portion 28 is formed, solid tabs 26 are provided on both ends of region D, and region D is expanded by moving first tab bodies 26A, 26A to create a setback state. Then, weld metal is formed up to the expanded region, and the groove faces of the orthogonal welded portions and the portions reaching the root gap are removed on the start and end sides of the weld metal in the same manner as in region B. This process can also eliminate the risk of defects on the start and end sides of welded portion 28. The details of the portions to be removed by the grinder on both ends of the welded portions 27, 28 will be described later when the end tabs 40 used in the second stage welding are described with reference to FIG. 4(c). Once the first stage of welding is completed, all of the solid tabs 26 installed at the corners of the lower column 20 and the upper column 21 are removed, and the second stage of welding begins. The solid tabs 26 are made of ceramic and are fixed to the corners via adhesive and aluminum foil, so they can be easily removed from the corners.

[0044] "Second stage welding" After the welds 27, 28 are formed by the first welding step, a second welding step is then performed using an end tab 40 shown in FIG. 4 to form the welds 41, 42 as shown in FIG. 1(c). As shown in FIG. 4(a), the end tab 40 is made up of a first tab body 40A, a second tab body 40B, and a third tab body 40C. The first tab body 40A, the second tab body 40B, and the third tab body 40C are all made of steel blocks and are installed by assembly welding on the outside of the corners between the upper end of the lower column 20 and the lower end of the upper column 21. The end tabs 40 are attached to the four corners between the upper end of the lower column 20 and the lower end of the upper column 21, respectively.

[0045] The configuration of the end tab 40 will be described below using the end tab 40 attached to the side surface 20B of the lower pillar 20 and the side surface 21B of the upper pillar 21 shown in FIG. 4(a) as an example. The first tab body 40A is made of a rectangular parallelepiped block, and one end face is attached to the side 20B by welding it to the upper corner of the side 20B. The first tab body 40A is attached to the side 20B so that the top face 40a is flush with the upper end face 20b of the side 20A. In addition, the first tab body 40A is attached to the side 20B so that one side face 40b is flush with the surface of the adjacent side 20A.

[0046] The second tab body 40B is made of a substantially rectangular parallelepiped block, and one end face is welded to the lower corner of the side face 21B and attached to the side face 21B. A slope 40d is formed on the lower face of the second tab body 40B, and the second tab body 40B is attached to the side face 21B so that the slope 40d is flush with the groove surface 21b of the side face 21A. In the second tab body 40B, the lower end of the inclined surface 40d is positioned slightly above the upper surface 40a of the first tab body 40A. The distance between the lower end of the inclined surface 40d and the upper surface 40a of the first tab body 40A is set to be the same size as the root distance, which is the distance between the lower end of the groove surface 21b and the upper end surface 20b of the lower pillar 20.

[0047] The third tab body 40C is made of a rectangular parallelepiped block, and is welded to the back side of the first tab body 40A and the back side of the second tab body 40B as shown in Fig. 4(a). The third tab body 40C is assembled and welded so as to close the gap formed between the lower end of the inclined surface 40d and the upper surface 40a of the first tab body 40A from the back side as shown in Fig. 1(a). 4(b) and (c) show the positional relationship between the end tab 40, the lower column 20, and the upper column 21. In Fig. 4(b), the welded portion 27 formed by the first stage of welding is depicted on the rear side of the end tab 40. In Fig. 4(c), the welded portion 27 formed by the first stage of welding is depicted on the right side of the end tab 40.

[0048] As explained above, the welded portion 27 formed in the first welding stage is formed using the solid tab 26 in a setback state, and therefore is prepared by removing unnecessary portions on both ends. 4(b) and (c) show the shape of the end of the welded portion 27. As shown in FIG. 4(b), the welded portion 27 is formed so as to cover the upper end surface 20b of the side surface 20B, so as to cover the groove surface 21b of the side surface 21B, and so as to fill the space between the upper end surface 20b and the groove surface 21b. Also, as shown in FIG. 4(c), the left end of the welded portion 27 is formed up to the area hidden by the second tab body 40B.

[0049] After the end tabs 40 are attached as shown in Figures 4(a) to 4(c), the second stage of welding is carried out. The end tabs 40 are attached to the four corners where the lower column 20 and the upper column 21 butt together, as explained above with reference to Figure 1(c). After the attachment of the end tab 40 is completed, the welding robot 33 is operated to form welds 41 and 42 in the areas A and C as shown in FIG. 1(c). To form the weld 41, the welding robot 33 performs a direct weld on the area A, including the butt joint between the lower column 20 and the upper column 21, up to the area of ​​the end tabs 40 installed on the starting and ending ends. To form the weld 42, the welding robot 33 performs a direct weld on the area C, including the butt joint between the lower column 20 and the upper column 21, up to the area of ​​the end tabs 40 installed on the starting and ending ends thereof.

[0050] 4(a), by providing the end tab 40, the upper surface 40a of the first tab body 40A is an extension of the upper end surface 20b of the side surface 20A, and the inclined surface 40d of the second tab body 40B is an extension of the groove surface 21b of the side surface 21A. Therefore, if region A is welded along the butt joint between the lower column 20 and the upper column 21, the boundary portion from the end of region A to the installation region of the end tab 40, or the boundary portion from the installation region of the end tab 40 to region A can be welded without generating welding defects. When direct welding is performed, there is a problem that defects such as insufficient penetration, blowholes, and crater cracks are likely to occur at the start and end ends. However, if direct welding is performed by welding robot 33 including the area of ​​end tab 40, even if a welding defect occurs, the welding defect will occur in the installation area of ​​end tab 40. Therefore, when end tab 40 is cut, welds (full-length welds) 41, 42 without welding defects are obtained.

[0051] The formation of the above-described welded portions 27, 28, 41, 42 has already been described in the outline of the welding method with reference to FIGS. 1(a) to (c). Weld metal was formed in regions B and D using solid tab 26, and weld metal was formed from both ends of regions B and D to the parts that protruded out from each region in accordance with the setback state of solid tab 26. The weld metal in the protruding parts was then removed to form welds 27 and 28. After forming welds 27, 28, end tab 40 was used to form weld metal up to the end tab installation area, and the weld metal in the installation area of ​​end tab 40 was removed to form welds 41, 42. Welds 27, 28, 41, 42 in this state are shown in Figure 1(c).

[0052] In the state shown in Fig. 1(c), the welds 27 and 41 are linearly adjacent to each other through a corner, and are made of weld metal that continues linearly without any seams at positions other than the corner. The weld 41 is a full-length weld that continues linearly without any seams over the entire length of the column width in the direction along the column width. Furthermore, the weld 27 can be described as a weld that is made of weld metal that continues linearly without any seams and reaches the groove face position of the full-length weld 41. In other words, the welds 41 and 42 are full-length welds, and the welds 27 and 28 are groove welds. For example, welds 41, 42 can be described as full-length welds that are continuous in a straight line without any seams over the entire length of the column width in the direction along the column width, and welds 27, 28 can be described as welds made of weld metal that is continuous in a straight line without any seams and that reach the groove face position of full-length weld 41 or full-length weld.

[0053] In the first embodiment described above, the erection piece 22 is provided at the upper corner of the side surface of the lower column 20 or the lower corner of the side surface of the upper column 21. When constructing a high-rise building at a construction site, columns according to the number of floors may be constructed using multiple lower columns 20 and upper columns 21. In this case, erection pieces 22 are attached to the upper and lower ends of the lower columns 20 and upper columns 21, respectively, and multiple lower columns 20 and multiple upper columns 21 are connected alternately in sequence to form a single column. When using the lower column 20 and the upper column 21 in this way, as an example, the lower column 20 (or the upper column 21) is used with an erection piece 22 provided at each of the corners at both ends in the length direction as shown in Figure 10(b). Note that the mounting position of the erection piece 22 is simply shown in Figure 10(b). As shown in FIG. 10(b), when the lower column 20 (or the upper column 21) with the erection pieces 22 attached to the side corners at both ends in the length direction is loaded horizontally onto a transport truck, the wire rope Y can be connected to the four erection pieces 22 and lifted by a crane to load onto the truck. By using the four erection pieces 22, the loading work can be performed while reliably supporting the lower column 20.

[0054] "Second embodiment" 5 and 6(a) are diagrams for explaining a welding method according to the second embodiment. In the structure shown in Figures 5 and 6(a), the configurations of the lower column 20 and the upper column 21 are the same as those of the first embodiment, but the mounting position and configuration of the erection piece 52 are different. In Figures 5 and 6(a), four erection pieces 52 are provided to correspond to the four corners 20e of the lower column 20 and the four corners 21e of the upper column 21, which are welded box-shaped cross-section columns.

[0055] As shown in Fig. 6(a), the erection piece 52 has a lower mounting piece 52a that is Y-shaped in plan view and is fixed to the corner 20e of the lower column 20 by fillet welding, and an upper mounting piece 52b that is Y-shaped in plan view and is fixed to the corner 21e of the upper column 21 by fillet welding. The base end 52d of the lower mounting piece 52a and the base end 52e of the upper mounting piece 52b are integrated by a connecting piece 52c that connects them. A splice plate 54 is attached to both the front and back sides of the connecting piece 52C of the erection piece 52, and through holes are formed through the two splice plates 54 and the erection piece 52. The erection piece 52 is reinforced by inserting connecting bolts (not shown) into these through holes and screwing nuts onto the connecting bolts. The erection piece mounting pieces 52a and 52b are intended to be installed at corners and are not limited to a Y-shape in plan view.

[0056] In addition, at the center of the length of the splice plate 54, on the corners 20e and 21e side, a cutout 54a is formed by partially cutting the erection piece 52 and the splice plate 54 in a semicircular shape when viewed from the side. The cutout 54a of the erection piece 52 and the splice plate 54 is intended to avoid interference with the welding rod during welding, and is not limited to this shape. The cutout 54a is formed to have a diameter that extends from the upper end of the lower column 20 to the lower end of the upper column 21. In Fig. 5(a), for the sake of simplicity, the erection piece 52 is simply depicted as a single plate, and the direction of the base end 52e of the erection piece 52 is shown. When the lower column 20 is viewed in plan as shown in Fig. 5(a), the four erection pieces 52 are installed at diagonal positions along the extension of the diagonal of the lower column 20. The erection piece 52 is disposed at a position spaced apart from the side surface of the lower column 20 and the side surface of the upper column 21 by the length of the base end portion 52e of the lower mounting piece and the upper mounting piece.

[0057] "Welding method according to second embodiment" In the welding method of the second embodiment, a weld is formed around the portion where the upper end of the lower column 20 and the lower end of the upper column 21 are butted together, and the lower column 20 and the upper column 21 are welded together. In the welding method of the second embodiment, as shown in FIG. 5(a), the lower column 20 and the upper column 21 are temporarily fixed by the erection piece 52, and a ceramic solid tab 53 is sandwiched between the corner portion 20e of the lower column 20 and the corner portion 21e of the upper column 21. After the solid tab 53 is placed, the welding robot 33 is used to form weld metal in the areas B and D to form welds 55 and 56 as shown in FIG. 5(a).

[0058] When forming the welds 55, 56 with the welding robot 33, the erection piece 52 is located at a distance from the lower column 20 and the upper column 21 by the length of the base end 52e of the lower mounting piece and the upper mounting piece. In addition, since the erection piece 52 has a semicircular cutout 54a around the butt joint between the lower column 20 and the upper column 21, sufficient work space is secured around the corners of the lower column 20 and the upper column 21. Using this working space, the welding robot 33 can perform direct welding while positioning the tip of the welding torch 38 with ample space around the butt joint between the lower column 20 and the upper column 21. Therefore, in both areas B and D, welds 55 and 56 can be formed that have no seams at positions other than the corners and that are free of welding defects.

[0059] After forming welds 55, 56 in areas B and D, all solid tabs 53 are removed, and welding robot 33 is used again to form welds 57, 58 in areas A and C as shown in Figures 5(b) to (c). When forming the welds 57, 58 in the areas A and C, the welding robot 33 can form the welds 57, 58 in the areas A and C by direct welding without any problems due to the relationship between the installation position of the erection piece 52 and the provision of the notch 54a. As shown in Fig. 5(c), the boundary between welded portion 55 and welded portion 57 is connected via inclined portions 55a and 57a formed at their ends. The boundary between welded portion 57 and welded portion 56 is connected via inclined portions 57b and 56a formed at their ends. The boundary between welded portion 56 and welded portion 58 is connected via inclined portions 56b and 58a formed at their ends. The boundary between welded portion 58 and welded portion 55 is connected via inclined portions 58b and 55b formed at their ends. The welded parts 55, 57, 56, and 58 are arranged in a rectangular frame shape in plan view as shown in FIG. 5(c), and cover the periphery of the butt joint between the lower column 20 and the upper column 21.

[0060] Once welds have been formed in areas B and D and areas A and C, all of the erection pieces 52 can be removed as shown in FIG. 5(c), and the welding work of the lower column 20 and the upper column 21 can be completed. According to the welding method according to the second embodiment described based on FIG. 5 and FIG. 6, it is possible to eliminate the welding seam around the erection piece 52, and there is an effect of reducing the number of welding steps.

[0061] In addition, at the four corners of the lower column 20 and the upper column 21, apparent weld seams occur at adjacent positions of the welded parts 55, 57, 56, and 58, but in this embodiment, the seams at the erection piece position can be reduced.

[0062] The welded joint shown in Fig. 5(c) is a welded joint formed by butting the upper end of the lower column 20 and the lower end of the upper column 21 together and joining them with welds 55, 56, 57, 58 arranged in a square frame shape in plan view around the butt joint. The square frame type welded part is made up of four linear welds 55, 56, 57, 58 in which the weld metal is continued in a straight line without any seams at positions other than the corners, and the four linear welds 55, 56, 57, 58 are assembled in a square frame shape in plan view with the inclined parts formed at both ends as apparent seams to form the welded joint.

[0063] FIG. 6(b) shows a modified example of the erection piece used when carrying out the welding method of the second embodiment. In the previous example, an erection piece 52 having a lower mounting piece 52a and an upper mounting piece 52b that are Y-shaped in plan view was used, but for the lower mounting piece and the upper mounting piece, an erection piece 73 may be configured using an L-shaped lower mounting piece 70 and an upper mounting piece 71 as shown in FIG. 6(b). Even in the structure in which the erection piece 73 shown in FIG. 6(b) is applied, the welded parts 55, 56, 57, and 58 can be formed as shown in FIG.

[0064] In the structures of the first and second embodiments described above, the groove surface 21A is formed at the lower end of the upper pillar 21, but the position at which the groove surface is formed may be either the upper end of the lower pillar 20 or the lower end of the upper pillar 21, or both.

[0065] FIG. 9(a) is a plan view showing a third embodiment of a welded joint according to the present invention. FIG. 9(a) is a plan view corresponding to FIG. 1(c) after welding. In the structure of FIG. 1(c), welds 41, 42, which are full-length welds, are provided in the column width direction, and welds 27, 28, which are groove welds, are provided in the column width direction. In contrast, in the third embodiment shown in FIG. 9(a), full length welds 41, 42 are provided in the column width direction, and groove inner welds 27, 28 are provided in the column width direction. In order to obtain the welded joint shown in FIG. 9(a), the attachment positions of the erection piece 22 and the solid tab 26 used in the first welding are adjusted, the attachment position of the end tab 40 used in the second welding is adjusted, and the welds 27 and 28 are formed in the areas A and C by the first welding, and the welds 41 and 42 are formed in the areas B and D by the second welding.

[0066] FIG. 9(b) shows a fourth embodiment of the welded joint. The welded joint in FIG. 9(b) has weld 42, which is the full length weld shown in FIG. 9(a), and weld 28, which is the inside groove weld, in the same region as the structure shown in FIG. 9(a). The fourth embodiment is characterized in that it has a weld 60 in region A and a weld 61 in region B. One end 60a of the weld 60 has the same structure as the end of the groove weld, and the other end 60b has the same structure as the end of the full-length weld. One end 61a of the weld 61 has the same structure as the end of the groove weld, and the other end 61b has the same structure as the end of the full-length weld. The structure shown in FIG. 9(b) also makes it possible to obtain a welded joint with fewer weld defects.

[0067] FIG. 9(c) shows a fifth embodiment of the welded joint. In FIG. 9(c), weld 42 which is the full length weld shown in FIG. 9(a) and weld 27 which is the inside groove weld are present in the same region as the structure shown in FIG. 9(a). The fifth embodiment is characterized in that it has a weld 62 in region C and a weld 63 in region B. One end 62a of weld 62 has the same structure as the end of the groove weld, and the other end 62b has the same structure as the end of the full-length weld. One end 63a of weld 63 has the same structure as the end of the groove weld, and the other end 63b has the same structure as the end of the full-length weld. The structure shown in FIG. 9(c) also makes it possible to obtain a welded joint with fewer weld defects. [Explanation of symbols]

[0068] 20...lower column, 20A, 20B, 20C, 20D...side, 20b...upper end surface, 21...Top column, 21A, 21B, 21C, 21D...Side surface, 21b...Grove surface, 22... erection piece, 22a... lower mounting piece, 22b... upper mounting piece, 22c...connecting piece, 23...splice plate, 26...solid tab, 26A...first tab body, 26a...bottom surface, 26B...second tab body, 26b...side surface, 26d...slope, 27, 27...welding section (inner groove welding section), 30...guide rail, 33...welding robot, 40... end tab, 40A... first tab body, 41B... second tab body, 41C...third tab body, 41, 42...welded portion (full length welded portion).

Claims

1. A welded joint in which a lower column and an upper column consisting of architectural structural columns are welded, wherein the corners of the upper end of the lower column and the corners of the lower end of the upper column have cut marks due to the erection piece that was installed before welding. A welded joint.

2. The upper end of the lower column made of a structural column and the lower end of the upper column made of a structural column are A welded joint in which a groove surface formed on at least one of the peripheral surface of the lower end of the upper column and the peripheral surface of the upper end of the lower column is interposed between the upper end of the lower column and the lower end of the upper column, the upper end of the lower column and the lower end of the upper column are butted together, and the welded joint is joined by a weld formed around the butted portion, In the weld, each of the two linear welds adjacent to each other via a corner portion is a weld made of a continuous weld metal in a straight line without any seam, Of the two linear welds, One linear weld is a groove weld and the other linear weld is a full length weld; The groove weld is a weld made of a weld metal that is continuous in a straight line without any seams and reaches the groove face position of the full-length weld, The full-length weld is a full-length weld made of weld metal that is linearly continuous in the direction along the column width without any seams at positions other than the corners. A welded joint characterized by:

3. In the weld, each of the four linear welds adjacent to each other via a corner portion is made of a linearly continuous weld metal without having any seams at any position other than the corner portion, Of the four linear welds, two are the full length welds and the remaining two are the groove welds. The weld joint of claim 2.

4. In the weld, each of the four linear welds adjacent to each other via a corner portion is made of a linearly continuous weld metal without having any seams at any position other than the corner portion, Of the four linear welds, one is the full length weld, one is the groove weld, and the remaining two are groove welds that have one side of the weld start and end reaching the groove face and root clearance position, and the other is made of weld metal that continues to the column plate end face. The welded joint of claim 3.

5. A seam was formed at a position where the groove weld contacted the full length weld. The welded joint according to any one of claims 1 to 4.

6. A method for forming a welded joint, characterized in that, when welding a lower column and an upper column which are architectural structural columns, an erection piece is provided at the corners of the upper end of the lower column and the lower end of the upper column.

7. The upper end of the lower column made of a structural column and the lower end of the upper column made of a structural column are A groove surface formed on at least one of the peripheral surface of the lower end of the upper column and the peripheral surface of the upper end of the lower column is interposed between the upper end of the lower column and the lower end of the upper column, the upper end of the lower column and the lower end of the upper column are butted together, and joined by a weld formed around the butted portion, In the weld, each of the two linear welds adjacent to each other via a corner portion is made of a linearly continuous weld metal without having a seam at a position other than the corner portion, Of the two linear welds, One linear weld is a groove weld and the other linear weld is a full length weld; The groove weld is a weld made of a weld metal that is continuous in a straight line without any seams and reaches the groove face position of the full-length weld, The full-length welded portion is a full-length welded portion made of weld metal that is linearly continuous in the direction along the column width without having any seams at positions other than corners over the entire column width, a weld joint forming method comprising the steps of: forming a weld metal on both the start and end sides of the groove weld that extends beyond the groove weld formation area to the full-length weld formation area; removing the weld metal that is present in the full-length weld formation area; and forming the full-length weld over the entire column width in the full-length weld formation area.

8. When forming the full-length welded portion over the entire column width in the formation region of the full-length welded portion, At the start and end sides of the formation area of ​​the full-length welded portion, end tabs are provided at outer positions beyond the formation area of ​​the full-length welded portion, which are simulating the shape of the upper end of the lower column, the shape of the lower end of the upper column, and the shape of the groove surface, which correspond to the formation area of ​​the full-length welded portion. A weld metal is provided beyond the formation area of ​​the full-length welded portion to the end tab area, and the portion of the weld metal formed in the end tab area is removed to form the full-length welded portion. The method of claim 7, wherein the weld joint is formed by welding.

9. The end tabs include a first tab body, a second tab body, and a third tab body that imitate the shapes of an end face, a groove face, and a root space formed on at least one of a lower end peripheral surface of the upper column and an upper end peripheral surface of the lower column.

9. The method of forming a weld joint according to claim 8.

Images