JP7005016B2 - End tab - Google Patents

Description

The present invention relates to an end tab, more specifically, an upper portion of a box pillar, a slanted surface for forming a groove is provided around the lower portion, and a backing metal for receiving molten metal is provided inside. Regarding the end tab used for welding and joining the upper member temporarily fixed by welding and the lower member or diaphragm plate having a flat upper surface, which is the lower part of the box column arranged with the root gap provided. ..

The corners of the box column joints are the points where the welds on both sides of the box column joint are joined, and the following methods have been conventionally used.
In other words, the weld beads on both sides of the corners are stopped just before the corners, the weld metal at the start and end is slightly removed by arc air gouging, the shape is adjusted, and then the weld metal 6 is raised by rotational welding at the corners. The method of molding is taken. This method requires arc air gouging equipment including compressor equipment and requires a higher level of welding skill, so it can be said that it is quite difficult to perform efficient and reliable welding.
Alternatively, as another method, a method is adopted in which a triangular steel plate tab material is attached to the corner portion and the corner portion is formed by joining the welding on both side surfaces to the tab material. However, in this method, the attachment of the tab material is considerably troublesome in consideration of the variation in the actual groove accuracy, defects are likely to occur inside the weld at the corner, and the bead appearance is not always desired.
As described above, conventionally, there has been no appropriate method for welding corners efficiently, soundly and satisfactorily.

In view of the above-mentioned circumstances, in Japanese Patent Application Laid-Open No. 9-174237 (Patent Document 1), when welding a box column joint, a solid flux tab material having fire resistance is brought into contact with the corner portion to make the corner portion sound and sound. A method of good arc welding has been proposed.

In this arc welding method, when welding a box column joint, a solid agent containing a fire resistant solvent as a main component is brought into contact with the corners of the box column joint, and two opposing surfaces of the box are arc welded and then solid flux. This is a welding method for a box column joint corner using a solid flux tab material in which the tab material is removed and the remaining two surfaces are arc welded to complete the welding of the box column joint corner.

By the way, when welding the upper member and the lower member of the box column as described above, usually, in order to secure a root gap, a part of a metal backing metal protrudes downward from the lower end of the upper member. It is normal to temporarily weld them in this way.

Here, the root gap is a welding gap having a predetermined width provided between the welded members in order to increase the welding strength and durability by welding penetration. The root gap is provided with a width of a few millimeters suitable for achieving weld penetration between the abutting weld members.

As described above, when the backing metal is welded to the upper member, a sealing bead is formed, and when the actual box column is welded, this sealing bead protrudes into the groove space. In order to install the tab material in the part, some measures are required for the sealing bead. However, no measures have been taken in the method of Patent Document 1 described above.

Japanese Unexamined Patent Publication No. 9-174237

Therefore, an object of the present invention is to provide an end tab made of ceramics, which is an end tab used in welding when constructing a box column and in which the sealing bead is fully considered.

The above object is achieved by the end tab of the present invention having the following configurations (1) to (3).
(1)
It is the upper part of the box pillar, and an inclined surface for forming a groove is provided around the lower part, and the backing metal for receiving the molten metal is the upper member temporarily fixed by welding inside and the root gap. It is the lower part of the box column arranged in the state where is provided, and is an end tab used when welding and joining a lower member or a diaphragm plate having a flat upper surface.
Formed of ceramic,
A flat bottom surface that abuts on the flat surface of the lower member,
A molten metal contact surface that rises vertically from one side of this bottom surface,
A groove bottom contact surface in contact with the bottom surface of the groove, which rises perpendicularly from one end of the bottom surface to the molten metal contact surface at an angle corresponding to the groove angle, and the molten metal. A groove surface contact surface that extends diagonally upward from the upper side of the contact surface to the molten metal contact surface at an angle corresponding to the groove angle and faces the bottom surface.
The tab portion for one end of the left and right ends of the groove provided with, and the tab portion for the other end symmetrical to this tab portion are integrally configured.
When the backing metal is temporarily fixed to the upper member by welding, it extends over the groove bottom contact surface of the tab portion for the left and right ends in order to avoid the sealing bead formed inside the upper member. Extends and has a sealing bead avoidance that is a tapered or curved recess,
An end tab that features that.
(2)
The end tab according to (1) above, wherein the ceramic is a mullite-based ceramic.
(3)
The end tab according to (1) or (2) above, wherein the total thickness is 10 to 20 mm.

In the end tab of the present invention, as described above, since the sealing bead avoiding portion which is a tapered portion or a curved concave portion is provided so as to extend over the contact surface of the groove bottom surface, the function of the end tab during welding is sufficient. Can be demonstrated.

1A and 1B are perspective views of an end tab according to the first embodiment of the present invention, FIG. 1A is a diagram showing the whole as a whole with the left and right parts integrated, and FIG. It is a figure which shows the structure. FIG. 2 is a front view of the end tab of FIG. FIG. 3 is a plan view of the end tab of FIG. FIG. 4 is a left side view of the end tab of FIG. FIG. 5 is a perspective view of an end tab according to a second embodiment of the present invention. FIG. 6 is a front view of the end tab of FIG. FIG. 7 is a plan view of the end tab of FIG. FIG. 8 is a left side view of the end tab of FIG. FIG. 9 is a perspective view showing a state in which the two end tabs of the present invention are attached to the joint portion of the box column. FIG. 10 is an enlarged view showing a main part of FIG. 9. FIG. 11 is a diagram showing a joint portion of a box column.

Hereinafter, the end tab 10 according to the first embodiment of the present invention will be described with reference to the accompanying drawings.
1, FIG. 2, FIG. 3, and FIG. 4 are a perspective view, a front view, and a left side view of an end tab according to the first embodiment of the present invention, respectively.

The end tab 10 is used when the upper member 110 and the lower member 120 of the box pillar 100 are welded and joined. The upper member 110 is an upper portion of the box pillar in the welded joint portion of the box pillar 100, and an inclined surface (groove surface) 112 for forming a groove is provided around the lower portion to receive the molten metal. The backing metal B for this purpose is temporarily fixed to the inside by the temporary welding portions W1 and W2 (FIG. 11). The lower member 120 is a lower portion of a welded joint portion of a box column arranged with a root gap G provided with respect to the upper member 110, and the upper surface is usually a flat surface 122. This end tab is also used when welding a flat diaphragm plate to the bottom of the upper member.

Of the temporary welded portions W1 and W2, the lower welded portion W2 is a sealing bead protruding into the groove space S in the welded joint portion, and some measures are required to arrange the end tabs. be.

The end tab 10 is made of ceramic, preferably a mullite-based ceramic that is resistant to thermal shock, and as shown in FIG. 1 (B), the tab portion 10b (left end) for one end of the left and right ends of the groove. The tab portion 10a (for the right end portion) for the other end portion, which is symmetrical to the tab portion, is integrally configured. Hereinafter, the tab portion 10b for the left end portion will be described as a representative. Regarding each part of the tab portion 10a for the right end portion, "a" is added to the reference number indicating the corresponding portion, and the description thereof will be omitted.
The tab portion 10b is a flat bottom surface 12b that abuts on the flat surface 122 of the lower member 120, a molten metal contact surface 16b that rises vertically from one side 14b of the bottom surface 12b, and one of the bottom surfaces 12b. A groove bottom contact surface 18b that comes into contact with the bottom surface of the groove and rises at an angle corresponding to the groove angle with respect to the molten metal contact surface 16b vertically from the end side 14b of the groove, and the molten metal contact surface. It extends diagonally upward from the upper side 20b of the 16b at an angle corresponding to the groove angle with respect to the molten metal contact surface 16b, and has a groove surface contact surface 22b facing the bottom surface 12b.
The tip of the tab portion is a connecting surface 24 which is a vertical surface connecting the left and right tab portions.

The tab portion 10b of the end tab 10 includes a sealing bead avoiding portion 30b for avoiding (not interfering with) the sealing bead W2 when the end tab 10 is installed in a joint portion of a box pillar. .. The sealing bead avoidance portion 30b is formed as a tapered portion extending over the groove bottom surface contact surface 18b of the tab portion.
The taper angle is preferably 40 to 60 degrees with respect to the bottom surface 12b.

Next, the end tab 50 according to the second embodiment of the present invention will be described with reference to FIGS. 5 to 8. 5 to 8 are a perspective view, a front view, a plan view, and a left side view of the end tab 50 according to the second embodiment, and FIGS. 1, 2, 2, and 3 of the end tab 10 according to the first embodiment described above. It is a figure corresponding to 4.

The end tab 50 according to the second embodiment includes curved sealing bead avoidance portions 52a and 52b. This curvature is formed by an arc, a part of an ellipse, another quadratic curve, or the like. When an arc is adopted, the radius of curvature is preferably 5 to 8 mm.
Since the end tab 50 according to the second embodiment has the same shape as the end tab according to the first embodiment except that the sealing bead avoidance portion is curved, further description thereof will be omitted.

The end tab of the present invention can have an extremely thin overall thickness of 10 to 20 mm. In the end tab of the present invention, as described above, a mullite-based ceramic having strong thermal shock resistance is used, and the tabs for the left and right ends of the groove are integrated to increase the thickness.

As shown in FIG. 9, the end tab 10 according to the embodiment of the present invention is installed at the left and right ends of the groove on one side of the box column joint portion, and is welded and joined using the groove between them.

In the end tab of the present invention, as described above, the sealing bead avoiding portion which is a tapered portion or a curved concave portion is provided so as to extend over the contact surface of the groove bottom surface, so that the end tab can be accurately fitted in the welded portion. It can fully demonstrate its function.

10: End tab 10a, 10b: Tab portion 12b: Bottom surface 14b: One side side 16b: Fused metal contact surface 18b: Groove bottom contact surface 20b: Fused metal contact surface upper side 30b: Sealing bead avoidance part W2: Sealing bead

Claims (3)

It is the upper part of the box pillar, and an inclined surface for forming a groove is provided around the lower part, and the backing metal for receiving the molten metal is the upper member temporarily fixed by welding inside and the root gap. It is the lower part of the box column arranged in the state where is provided, and is an end tab used when welding and joining a lower member or a diaphragm plate having a flat upper surface.
Formed of ceramic,
A flat bottom surface that abuts on the flat surface of the lower member,
A molten metal contact surface that rises vertically from one side of this bottom surface,
A groove bottom contact surface in contact with the bottom surface of the groove, which rises perpendicularly from one end of the bottom surface to the molten metal contact surface at an angle corresponding to the groove angle, and the molten metal. A groove surface contact surface that extends diagonally upward from the upper side of the contact surface to the molten metal contact surface at an angle corresponding to the groove angle and faces the bottom surface.
The tab portion for one end of the left and right ends of the groove provided with, and the tab portion for the other end symmetrical to this tab portion are integrally configured.
The groove bottom contact surface of the tab portion for the left and right ends for avoiding the sealing bead formed in the groove of the upper member when the backing metal is temporarily fixed to the upper member by welding. It has a sealing bead avoidance portion that extends over and is a tapered or curved recess.
An end tab that features that. The end tab of claim 1, wherein the ceramic is a mullite-based ceramic. The end tab of claim 1 or 2, wherein the total thickness is 10 to 20 mm.

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