JPS61180679A - Production of box column - Google Patents

Abstract

PURPOSE:To produce the box column having high reliability without any welding defect by performing CES welding by conducting to the external part with piercing the column shaped space after welding the corner angle part by assembling tentative box column with skin plate and diaphragm. CONSTITUTION:Tentative box column 7 is assembled with two sheets of skin plates 1a, 1b, two sheets of skin plates 2a, 2b with edge preparation and diaphragm 3. The whole beveling length is welded by corner angle part welding device and the corner angle part is welded in order by turning over the tentative box column 7. The corner angle welding part corresponding to the column shaped space 6 is then pierced in order, both ends of the column shaped space 6 is conducted to the external part and CES welding is performed using this column shaped space 6. Complete box column is made by performing deflection removal, finishing, non-destructive inspection, etc. after removing the start part and end part of the CES welding part by arc air gouging, etc. further. No carbon nor dust thus remain on the beveling and welding defect is completely eliminated.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a method of manufacturing a box column.

[Conventional technology]

Conventionally, the manufacture of box columns in which the diaphragm is welded to the skin plate at predetermined locations by means of consumable electroslag (abbreviated as CES) welding involves corner welding openings of the skin plate corresponding to two sides of each diaphragm. The tip was notched, and CES welding was performed using each columnar space formed along the two sides of each diaphragm that was temporarily attached inside the box column in the assembled state. After removing the start and end parts of the CE8 weld weld metal using arc air gouging, welding is carried out along the entire length of the corner groove weld line, and on the remaining two sides of each diaphragm, skin plates are perforated and CESWI welding is performed. It was happening. In this way, performing CES welding before welding the angle groove requires regenerating the angle groove using arc air gouging, and carbon and dust may remain in the angle groove. Therefore, corner welding of the groove weld line cannot be performed until this has been completely removed. If carbon, dust, etc. remain in the groove, these will become a major cause of defects in the angle weld, and when regenerating the angle groove with arc air gouging, the core part will be damaged. There were problems such as scratches occurring on the welding surface, and these scratches appearing as defects in corner groove welding.

[Purpose of the invention]

The present invention was made in view of the above circumstances, and it solves the problems of the prior art by simple and rational means, provides a manufacturing method with no defects in corner welding, and eliminates welding defects. The aim is to provide a highly reliable box column.

[Means for Solving the Problems] The box column manufacturing method of the present invention, which solves the problems of the prior art, consists of a skin plate and a diaphragm, and the diaphragm is attached by keyhole welding such as CES welding. When manufacturing box columns, temporary attachment is the first step of corner welding the entire length of the corner weld lines at the four corners of the box column in the assembled state. A second step of drilling the above-mentioned corner welds corresponding to each columnar space and connecting each columnar space with the outside; CES
The third step of keyhole welding, such as welding, is to rotate the box column in this state by 90 degrees and punch a skin plate portion corresponding to each columnar space formed along the other opposing side of the diaphragm. , a fourth step in which each columnar space is electrically connected to the outside, and a fifth step in which keyhole welding is performed by CES welding or the like using each columnar space electrically connected to the outside.
It is characterized by consisting of the following steps.

〔Example〕
Figure 1 is a perspective view of the box column in the temporarily assembled state, and Figure 2 is a perspective view of the box column in the temporarily assembled state.
The figure is a plan view of the main part of the same as above, and Figure 3 "t by C" is a flow explanatory diagram, where a shows the corner welded state along the entire length of the groove weld line, and b shows the corner welded part corresponding to the columnar space ζ. C shows a state in which a hole is drilled and the columnar space is electrically connected to the outside, and C shows a state in which consumable nozzle type CES welding is performed using this columnar space that is electrically connected to the outside.

Next, an example of the method of the present invention will be explained with reference to the above drawings. Two skin plates (la) (lb),
Two beveled skin plates (2m), (2
b) and, for example, a diaphragm (3) that is attached to a marked area on the inner surface of the skin plate (1a), respectively.
Assemble it into a box shape and attach it to the board as shown in the figure.

This diaphragm (3) is made by temporarily attaching metals (5) to the front and back surfaces of the four sides of the rectangular plate (4).
) has a concave groove formed by protruding the outer edge of the square plate (4) outward from the edge surface of the rectangular plate (4), and this diaphragm (3) is connected to each skin play h (1m), -(Ib),
(2m) and (2b), the opening surface of the groove is closed by the inner surface of the skin plate, forming a columnar space (c).

In detail, the skin plate (2,
a) and (2b), and install both skin play) (2a) and (2b) above the diaphragm (2a) and (2b).
3) and/or temporarily attach it to the skin plate (1m) to form an upward U-shaped column, then place the remaining skin plate (lb) on the opening side of the U-shaped column and temporarily attach it. to form a temporary box column (7). In this state, the corner weld lines are on both end faces of the temporary box column (7), so rotate this by 9G with a reversing machine to position the groove weld lines on the top and bottom surfaces of the temporary box column (7). .

Next, the temporary box column (7) is horizontally transported by a conveyor (not shown) such as a conveyor at a speed that matches the welding speed, and the entire length of the groove is welded by a corner welding device (not shown). Once the corner on one side is finished, turn this temporary box column (7) 180° using a turning machine, etc.
Place the temporary box column (7) so that the unwelded weld line faces upward.
) change their posture. Next, the entire length of the weld line on this surface is welded using a corner device. (Fig. (3) a) When the corner welding on both sides is completed, use a drilling machine (path shown) to drill a corner weld corresponding to one opposing columnar space (c), and then Connect one side of the terminal to the outside. After completing this work, use a reversing machine to turn the temporary box column (7)
°Flip and drill a hole in the other corner weld using the same method.
Both ends of the columnar space (c) are electrically connected to the outside. (Figure 3b
) Next, this temporary box column (7) is carried and supplied to a welding device (the path shown) using CES or the like, and CES welding is performed using this columnar space (c) by a known means.

(Fig. 3C) After this work is completed, the temporary box column (7) is rotated 90 degrees by a reversing machine, and the skin plate (1 &
Or (lb) is the top surface. Then, use a drilling machine to make a hole in the skin play (la/b) corresponding to the other columnar space (c) to make one side of the columnar space (c) conductive to the outside.After this work is completed, the temporary box column Flip (7) 180° using a reversing machine and play the other skin) (la/b)
is the top surface, and a hole is drilled using the same method as above to form a columnar space (c
) are connected to the outside. Next, this temporary box column (7) is carried into the CES welding equipment again in the same position, and using this columnar space (c), CE is applied by known means.
Perform S welding. And the starting part of CES welding by arc air gouging etc.

After removing the end portion, distortion removal, finishing, and non-destructive testing are performed to obtain the completed box column.

〔effect〕

In this way, the present invention does not first perform CES welding corresponding to the groove, as in the prior art, but after welding the corner, a hole communicating with the columnar space is formed in the corner weld. Since the procedure is to drill a hole and perform CES welding using this columnar space, unlike conventional technology, there is no residual carbon or dust in the groove, there are no welding defects caused by these, and there is no arc air gouging. Welding defects caused by scratches that occur during corner groove regeneration can be completely eliminated, and a highly reliable box column can be reasonably obtained.

[Brief explanation of drawings]

Figure 1 is a perspective view of the temporary box column in the temporarily assembled state;
The figure is a plan view of the essential parts of the same as above, and Figure 3 at b#C is a flowchart showing the order of corner welding, drilling, and CES welding. (la), (lb) - skin plate, (2m
), (2b) -- skin play with grooves), (3)
... diaphragm, (5) ... deposit, (c) ...
Columnar space, (7)...temporary box. Patent applicant Kawasaki Heavy Industries, Ltd. Figure 1

Claims (1)

[Claims] (a) Consisting of a skin plate, a diaphragm, etc.,
When manufacturing a box column in which the diaphragm is attached by keyhole welding such as CES welding, (b) a first step of corner welding the entire length of the corner weld line at the four corners of the box column in the temporarily assembled state; (c) a second step of drilling the corner welds corresponding to each of the columnar spaces formed along one opposing side of the diaphragm, and making each of the columnar spaces conductive to the outside; CES using each columnar space connected to the outside
A third step of performing keyhole welding such as welding, (e) rotating the box column in this state by 90 degrees and forming a skin plate portion corresponding to each columnar space formed along the other opposing side of the diaphragm; (f) CES using each columnar space connected to the outside;
A method for manufacturing a box column, comprising: a fifth step of performing keyhole welding by welding or the like.