JPH06114552A - Box-shaped column welding method - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a method of welding a box-shaped column in which the groove processing is simplified with a single groove and the deformation is small with a constant welding width. [Structure] A groove 9 having a depth up to the middle of the thickness of the plate material 2 is formed in a portion of the plate materials 2 and 3 forming the box-shaped column to be welded over the entire length of the portion to be welded, and the beam is formed in the box-shaped column. The mounting location is such that the inside 10 of the groove 9 is welded first by electron beam welding, laser welding or plasma welding until it reaches the back surface of the plate material 2, and then the groove 9 is continuously welded over the entire length.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of welding a box-shaped column, which is constructed by welding an elongated plate material in a rectangular cross section.

[0002]

2. Description of the Related Art Pillars of high-rise buildings constructed in recent years have a thickness of 2
A box-shaped column is used, which is formed by welding an elongated plate material of 0 mm to 100 mm into a box shape having a quadrangular cross section.

As shown in FIGS. 3 and 4, the box-shaped column 1 is constructed by welding elongated iron plate members 2, 2, 3 and 3 in a rectangular cross section. Then, a horizontal beam 4 is attached to a required portion of the box-shaped column 1 by welding.

Generally, the welding of the plate members 2 and 3 which form the box-shaped column 1 is performed at a half of the thickness T of the plate member 2 1 / 2T as shown in FIG.
A groove 5 having a shallow depth is formed and welding 6 is performed. However, since the portion A of FIGS. 3 and 4 for mounting the beam 4 on the box-shaped column 1 must be firmly welded, as shown in FIG. 5, a deep groove 7 having a depth substantially equal to the thickness T of the plate material 7 is formed.
Is formed, and welding 8 is performed to reach the plate thickness of the plate material 2.

Therefore, in the conventional box-shaped column 1, the portion A to which the beam 4 shown in FIGS. 3 and 4 is attached has the deep groove 7 shown in FIG. 5, and the beam 4 is not attached. The shallow groove 5 shown in FIG. 6 was formed in the portion B.

Therefore, in the case of manufacturing the conventional box-shaped column 1, it is necessary to change the groove and cut, and welding is also performed when the plate materials 2 and 3 have a thin plate thickness of about 50 mm or less.
Although it can be completed by one welding, if the plate materials 2 and 3 are as thick as about 50 mm or more, the deep groove 7 (see FIG. 5) of the portion A in FIGS. 3 and 4 is used. At the time when the first groove was welded to the same depth as the shallow groove 5 in FIG. 6, continuous welding was performed over the entire length of the groove.

[0007]

As described above, since the groove is different from the conventional one, it is necessary to perform the two steps of forming the deep groove 7 after forming the shallow groove 5 and the shallow groove 5 and the deep groove 7. It was necessary to finish the connection part of the gently.

In welding, the deep groove 7 is first followed by the shallow groove 5
After welding to the same depth as, it is necessary to divide into two stages: welding the entire length of the groove, deep groove 7 and shallow groove 5
Since groove angles and widths of and differ from each other under the same welding conditions, adjustments were required each time.

Since welding 8 with a deeper groove 7 has a large amount of welding and uses a large current, the heat influence exerted on the plate materials 2 and 3 may be large and the material may be deteriorated. I had to do it.

The present invention eliminates such conventional drawbacks,
It is an object of the present invention to provide a method for welding a box-shaped column in which the groove processing is simple with a single groove and the deformation is small with a constant welding width.

[0011]

According to the method for welding a box-shaped column of the present invention, a groove having a depth up to the middle of the thickness of the plate is formed in a portion of the plate that constitutes the box-shaped column to be welded. Formed over the entire length of the portion to be welded, and the depth of the groove at the portion to be welded of the plate material at the position where the beam is attached to the box-shaped column is reached by electron beam welding or laser welding or plasma welding until the back surface of the plate material is reached. And then continuously welding the groove over its entire length.

[0012]

[Function] The groove processing is completed only by forming a single-shaped groove with a depth of up to the middle of the plate thickness over the entire length of the plate forming the box-shaped column. Weld the entire plate thickness without changing it.

[0013]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is an enlarged sectional view of a portion A of FIGS. 3 and 4 welded by the method of the present invention, and FIG. 2 is an enlarged sectional view of a portion B of FIGS. 3 and 4 welded by the method of the present invention. Irrespective of the A portion where the beam 4 is attached and the B portion where the beam 4 is not attached, the plate material 2, 3 forming the box-shaped column 1 is opened at a constant depth up to the middle of the thickness of the plate material 2. The tip 9 is formed as shown in FIGS.

In welding, as for the portion A of the box-shaped column 1 to which the beam 4 of FIGS. 3 and 4 is attached, as shown in FIG. 1, the depth 10 of the groove is reached to the backing metal 11 on the back surface of the plate 2. Weld first by electron beam welding, laser welding or plasma welding. In these electron beam welding, laser welding, and plasma welding, the plate materials 2 and 3 can be welded by a thin welding beam with a small heat input without thermal deformation even at a place where the groove 9 is not provided (I groove).

Next, the plate members 2 and 3 are continuously welded over the entire length of the groove 9. At this time, since the groove 9 has a constant shape over the entire length, continuous welding can be easily performed in a short time by using a normal welding method, for example, a submerged arc welding method.

As a result, the plate members 2, which form the box-shaped column 1,
3 is the groove 9 and the inner part 10 of the groove 9 where the beam 4 is attached.
The entire thickness of the plate material 2 is welded and the beam 4 is not attached B
Only the groove 9 up to the middle of the thickness of the plate member 2 is welded to the portion.

[0018]

According to the present invention, the groove has the same shape over the entire length, continuous welding can be performed under constant welding conditions, welding can be easily performed without welding defects, and the number of welding steps and welding materials can be reduced. Since the welding heat input can be reduced, the deterioration of the welding material can be prevented, the welding deformation can be reduced, and the welding width of the final layer is narrow and the width is the same.

[Brief description of drawings]

FIG. 1A of FIGS. 3 and 4 welded by the method of the present invention.
It is an expanded sectional view of a part.

FIG. 2B of FIGS. 3 and 4 welded by the method of the present invention.
It is an expanded sectional view of a part.

FIG. 3 is a partial perspective view of a box-shaped column.

FIG. 4 is a partial detailed view of FIG.

FIG. 5 is an enlarged cross-sectional view of a portion A in FIG. 3 welded by a conventional method.

6 is an enlarged cross-sectional view of a portion B of FIG. 3 welded by a conventional method.

[Explanation of symbols]

 1 Box-shaped pillar 2 Plate material 3 Plate material 4 Beam 9 Groove 10 Behind groove

Claims (1)

[Claims] 1. A groove for forming a box-shaped column in a plate member to be welded is formed over the entire length of the portion to be welded, the groove having a depth up to the middle of the thickness of the plate member. Weld the inside of the groove at the place to be welded of the plate material at the mounting position first by electron beam welding, laser welding or plasma welding until it reaches the back surface of the plate material, and then continuously weld the groove over the entire length. A method of welding a box-shaped column, characterized by: