JPS6116555B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for welding reinforcing members such as rib plates or diaphragms into closed cross-section box structural members such as column members in various structures.

For example, when joining a beam member to a column member with a box-shaped cross section, a reinforcing member such as a rib plate is welded into the box-shaped cross-section member as a column member in order to improve the mechanical performance of the column-beam joint. It has been known for a long time to. In this case, a method for welding a rib plate into a box-shaped cross-sectional member whose periphery is closed is to provide a welding groove on one or two sides of the rib plate that is in contact with the inner surface of the box-shaped cross-sectional member. A method of welding in the groove by means such as electroslag welding is known (Special Publication No. 45-20368, Special Publication No. 51-
No. 15497).

As shown in Fig. 1, these welding methods involve welding a pair of auxiliary materials 2 to both sides of one side of a rib plate 1 in advance, and then welding the tips of both auxiliary materials 2 to an outer circumferential member 3 that forms a closed cross section. Electroslag welding is performed by inserting the welding rod 5 into the welding groove 4 formed between both auxiliary materials 2 while in contact with the inner surface.

By the way, in a structure having a welded part inside a closed cross-section box structural member, the condition of the welded part cannot be seen from the outside of the structural member.
The problem is that after welding, it is unclear whether or not the deposited metal has penetrated uniformly in all welding lines.

For example, in a preferred form of electroslag welding as shown in FIG. As shown by the concentric circle R1, melting occurs on average, but if the rib plate 1 has a large wall thickness h of 22 mm or more as shown in Figure b, the width H of the welding groove 4 increases and welding Groove 4
The welding rod does not melt evenly within the welding groove, and as a result, insufficient welding of the weld metal 7 occurs at the corners of the welding groove 4.

Furthermore, even in the case of welding in a preferable form as shown in FIG. In some cases, when there is a temporary fluctuation in the welding current during welding, for example due to the activation of equipment in the factory that generates a relatively large current load, such as a crane, the weld metal 7 may partially penetrate. The circle R2 may be smaller than the appropriate concentric circle R1, and an insufficient penetration portion 6 may occur at the right-angled corner portion. Of course, such a condition occurs during a continuous process of welding work, and since the condition cannot be confirmed from the outside, there is a problem in that the portion is overlooked as a welding defect.

The present invention aims to provide an appropriate welding method that can solve the problems when welding rib plates to closed-section box structural members as described above by electroslag welding. By welding a pair of welding groove forming auxiliary materials facing each other on both sides of one side of the internal component material, which have depressions on their inner surfaces, weld the inner circumference of the welding groove so that there are no right-angled corners. When the welding rod is melted in the welding groove, the weld metal is evenly deposited on the inner circumferential surface of the welding groove to prevent insufficient penetration from occurring. be.

Next, the present invention will be explained with reference to the embodiments shown in FIG. 3 and below. In FIG. 3, 10 is a rib plate;
13A, 13B, 13C, and 13D are outer circumferential members forming a closed cross-section box structure. As a method for welding the rib plate 10 into a closed cross-section box structural member made of these outer circumferential members, for example, three sides of the rib plate 10 are welded to the inside of the three outer circumferential members 13A, 13B, and 13C which are in an open cross-section state. Welding 18 is performed on the side surface, and finally, the open cross section is closed by one outer peripheral member 13D, and this outer peripheral member 13D and one side of the rib plate 10 are welded by electroslag welding. A pair of welding groove forming auxiliary materials 12 for forming welding grooves 14 are welded in advance to both ends of one side 11 of the rib plate 10 on which electroslag welding is performed. As shown in FIG. 4, both auxiliary materials 12 in the present invention are welded to one side of the rib plate 10, and a depression 19 is provided in advance on their opposing inner surfaces, so that the tips of both auxiliary materials 12 are attached to the outer periphery. In the state of contacting the inner surface of member 13D,
A corner 20 having a wide cross section having an angle larger than a right angle is formed at the joint between the two members.

A depression 19 in both auxiliary materials 12 is formed on the inner periphery of a welding groove 14 formed between both auxiliary materials 12, the outer peripheral member 13D, and the rib plate 10, as indicated by a dotted line centered on the center point P of the groove. It is preferable that the curved line forms the concentric circles R shown in FIG.

Considering the molten state of the deposited metal inside the welding groove 14, this is because the above-mentioned concentric circle R is formed on the inner circumference of the welding groove 14 by the depressions 19 of both auxiliary materials 12. For example, as shown in FIG. 5, not only the inner surfaces of both auxiliary members 12 but also the inner surface of the part of the outer circumferential member 13D where the welding groove 14 is formed can be connected to the recess 19 to form a concentric circle R. It is more preferable to provide a recess 21.

From the same point of view, it can be said that it is preferable to provide a similar recess on the end surface 10a of the rib plate 10 at a position opposite to the recess 21 of the outer peripheral member. Since the corner with 12 is provided with a fillet weld 22 which can be performed in an open state in advance, this fillet weld 22 can play the same shape role as the wide-angle cross-sectional corner 20 described above. That is, both auxiliary materials 12
When welding the rib plate 10 to the rib plate 10, the fillet weld 22 is provided in advance so that the end surface 10a of the rib plate 10 is located slightly below the lower end 19a of the recess 19 of the auxiliary material. , the surface from the top surface of this fillet weld 22 to the center of the end surface 10a of the rib plate 10 has a substantially similar shape to the recess 21, which eliminates the trouble of intentionally providing the recess in the end surface 10a of the rib plate 10 in advance. can be omitted.

Welding within the welding groove 14 having the internal cross-sectional shape as described above is performed using a method similar to the general-purpose electroslag welding method, as shown in FIG.
This is carried out by inserting the welding rod 15 into the welding groove 14 through an insertion hole (not shown) formed in the upper end portion of the welding groove 14 on one side of D and energizing the welding rod 15.

In the present invention, by providing the recesses 19 on the opposing inner surfaces of both the auxiliary materials 12 that form the welding groove 14 as described above, the recesses 19 are formed at right angles to the joint portion between the auxiliary materials 12 and the outer circumferential member 13D. Since the corner portion 20 having a wide angle cross section with a larger angle than Even if an imbalance in welding heat input occurs due to fluctuations in welding current during welding, the weld metal 17 can penetrate smoothly into the wide-angle cross-sectional corner 20. It is possible to reliably eliminate the insufficient penetration 6 at the corners, which occurs in the conventional welding method of this type shown in FIG. 2b. Therefore, according to the welding method of the present invention, the penetration of the deposited metal 17 into the inner circumferential surface of the welding groove 14 is made uniform during electroslag welding or electrogas welding, and an appropriate closed-section box structure without insufficient penetration is achieved. This has the effect that rib plate welding can be performed in.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway perspective view showing the component structure of the conventional rib plate welding method in a closed section box structure, and Fig. 2 a and b both show the shape of the weld groove in the conventional rib plate welding method. A cross-sectional view, FIG. 3 is a partially cutaway perspective view showing the component configuration of the rib plate welding method in a closed section box structure of the present invention, and FIG. 4 shows an example of the shape of a welding groove in the rib plate welding method of the present invention. FIG. 5 is a partial sectional view showing another embodiment of the shape of the weld groove in the construction method of the present invention. In the figure, 10: rib plate, 12: auxiliary material, 13A,
13B, 13C, 13D: Outer peripheral member, 14: Welding groove, 15: Welding rod, 17: Weld metal, 19, 2
1: recess, 20: wide-angle cross-sectional corner, 22: fillet weld.

Claims (1)

[Scope of Claims] 1. In a method of welding an internal component such as a rib plate or diaphragm installed inside a closed cross-section box structural member to an outer peripheral member as a box structural member, the internal component is A pair of welding groove forming auxiliary materials with depressions on the inner surface are welded in advance while facing each other, and the joint between the tips of both auxiliary materials and the inner surface of the outer peripheral member in the welding groove formed between these auxiliary materials is made at right angles. A method of welding a rib plate with a closed cross-section box structure, characterized in that the rib plate is formed as a wide-angle cross-section corner larger than the square cross-section, and the inside of the weld groove thus formed is welded by electroslag welding or electrogas welding. 2 A recess connected to the recesses of both auxiliary materials is provided on the inner surface of the welding groove forming part of the outer peripheral member that is joined to the tips of the pair of auxiliary materials to close the welding groove, and welding is performed in the welding groove having a substantially circular cross section. A rib plate welding method for a closed cross-section box structure according to claim 1, comprising: