JPS6210756B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a structure in which a rib plate is installed inside a closed-section box-shaped structural member such as a column member in various steel structures.
The present invention relates to a method for welding reinforcing members such as diaphragms.

[Prior art]

Conventionally, when joining a beam member to a box-shaped column member with a closed cross-section, a reinforcing member such as a rib plate is welded inside the box-shaped column member, so that the joint portion between the column member and the beam member is It is widely practiced to improve mechanical performance.

By the way, as a method for welding a reinforcing member such as a rib plate inside such a box-shaped column member,
For example, as shown in FIG. 4, a pair of auxiliary members 2, 2 are welded in advance to both sides of one side edge of the rib plate 1, and the tips of the auxiliary members 2, 2 are an outer peripheral member forming a closed cross section. While in contact with the inner surface of 3,
A method of performing electroslag welding by inserting a welding rod 5 into a welding groove 4 formed between both auxiliary members 2 and 2 (Japanese Patent Publication No. 45-20368, etc.) has been proposed for the convenience of users. There is.

By the way, in a structure that has a welded part inside a closed-section box-shaped structural member, the state of the welded part cannot be seen from the outside of the structural member, so it is difficult to see if the welded metal in all the welding lines is melted after welding. It is unclear whether the filling was done uniformly or not. This means that, for example, in a preferred form of electroslag welding as shown in FIG. 5a, the welding rod 5 is
is melted on average within the welding groove 4 as shown by a concentric circle R1 centered on the center P of the welding groove 4,
As shown in FIG. 5b, when the wall thickness h of the rib plate 1 is a predetermined value, for example, 22 mm or more, the width H of the welding groove 4 becomes large and the melting of the welding rod into the welding groove 4 is prevented. This is not done evenly, and as a result, insufficient penetration of the weld metal 6 occurs at the corners of the weld groove 4.

Furthermore, even in the case of welding in a preferable form as shown in FIG. If the welding current is temporarily changed 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 may partially Concentric circle R smaller than the appropriate concentric circle R1
It may melt in state 2, resulting in insufficient penetration 6 at the right-angled corner.

Of course, such a condition occurs during a continuous process of welding work, and since the condition cannot be confirmed from the outside, the portion will be overlooked as a welding defect.

Therefore, as a result of extensive research in order to obtain a welding method in which the deposited metal melts evenly in the welding groove and does not cause insufficient penetration, the inventor has developed a pair of auxiliary materials attached to the rib plate. It was discovered that the desired purpose could be achieved by forming recesses on the inner side of the outer peripheral member facing the member so that when the welding rod melts, they form obtuse angles between the inner surfaces of both auxiliary members. Ta.

[Purpose of the invention]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a method for welding an internal reinforcing member in a closed cross-section box-shaped structure in which the deposited metal melts uniformly in the welding groove and does not cause insufficient penetration.

[Summary of the invention]

The present invention provides a welding method for welding an internal reinforcing member such as a rib plate installed inside a closed-section box-shaped structural member to an outer circumferential member constituting the box-shaped structural member. Preliminarily forming recesses on the inner side of the outer peripheral member facing the pair of welding groove forming auxiliary members to be welded, such that when the welding rod is melted, each of the recesses forms an obtuse angle with the inner surfaces of both the auxiliary members,
The method is characterized in that a welding rod is inserted into the welding groove thus formed and welding is performed by electroslag welding or electrogas welding.

Further, in this case, it is preferable that the recess formed on the inner side of the outer circumferential member has a substantially trapezoidal shape, and that a triangular meeting portion is provided between both ends of the substantially trapezoidal recess and both auxiliary members.

〔Example〕

Next, preferred embodiments of the method of the present invention will be described in detail below with reference to the accompanying drawings.

In FIG. 1, when welding the rib plate 13 to predetermined internal locations of the outer circumferential members 10a, 10b, 10c, and 10d forming a closed cross-section box-shaped structure, first, one side edge 1 of the rib plate 13 is
A pair of auxiliary members 17, 17 for forming welding grooves 15 are welded on both sides of 3a. in this case,
The welding between the edge 13a of the rib plate 13 and the auxiliary member 17 is approximately equilateral at the intersection D, and S≒45
This is done by fillet welding so that the edge 1
3a and the auxiliary member 17 have a rounded obtuse cross section (see FIG. 3).

Next, the three side edges 13b, 13c, and 13d of the rib plate 13 are welded to the inner surfaces of the three outer peripheral members 10b, 10c, and 10d, which have been previously formed in an open cross-sectional state, and the remaining outer peripheral member 10a is then opened. This outer peripheral member 10a and the side edge 1 of the rib plate 13 are closed so as to close the cross section.
3a will be welded by electroslag welding or the like. In this case, the inner side of the outer circumferential member 10a facing the side edge 13a is provided with an obtuse angle between this inner side and each inner side end of the auxiliary members 17, 17 when welding is performed. A recess 19 is formed in advance. That is, this recess 19
As is clear from the drawings and FIG. 3, for example, the inner surface of the outer peripheral member 10a is formed into a substantially trapezoidal shape, and both ends of the trapezoidal recess 19 and the auxiliary member 17,
A triangular meeting portion 21 (the shaded portion in FIG. 3) is provided between the inner end portions 18, 18 of 17.

When welding the outer peripheral member 10a and the rib plate 13 configured in this manner, an insertion opening (see FIG. The welding rod 23 is inserted into the welding groove 15 (not shown) and the welding rod 23 is energized. In this case, since the joining part 21 is melted before other parts by the heat of fusion, the inner end parts of each of the auxiliary members 17, 17 and the recessed part 19 formed in the outer peripheral member 10a form an obtuse angle. Therefore, weld metal 2
5 uniformly welds concentrically into the welding groove 15 from the center P, thereby preventing the occurrence of insufficient penetration areas as in the conventional case. Note that since the welded portion between the edge 13a of the rib plate 13 and the auxiliary members 17, 17 also has an obtuse cross section, the meeting portion 2
It will play the same shape role as 1.

〔Effect of the invention〕

As described above, according to the welding method according to the present invention, when the welding rod is melted on the inner side of the outer peripheral member facing the auxiliary member attached to the rib plate, an obtuse angle is formed between the ends of each auxiliary member. Since we have formed a concave part to form a concave part, when the weld metal elutes concentrically from the center P of the weld groove, it melts uniformly into the inner circumferential surface of the weld groove, and even if welding is in progress, Even if there is an imbalance in the welding heat input due to fluctuations in the welding current, the weld metal can penetrate smoothly into the joints.
It is possible to reliably solve the problem of insufficient penetration in the corners, which occurs in the conventional welding method of this type shown in Fig. 5b, and therefore, when electroslag welding or electrogas welding is performed, the inner peripheral surface of the welding groove of the deposited metal is This has the advantage that rib plates can be welded in an appropriate closed-section box structure without any insufficient penetration by uniformly penetrating the rib plate.

Although the preferred embodiments of the welding method for the internal components of the closed cross-section structural member according to the present invention have been described above, the present invention is not limited to these embodiments, and is within the scope of the spirit of the present invention. Of course, various modifications can be made.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view showing the component structure of the rib plate welding method in a closed section box structure according to the present invention, and FIG. 2 is a partial sectional view showing an example of the shape of a welding groove in the rib plate welding method of the present invention. , FIG. 3 is a partially enlarged cross-sectional view of FIG. 2, and FIG. 4 is a partially cutaway perspective view showing the component configuration of the conventional rib plate welding method in a closed-section box structure.
Figures 5a and 5b are partial cross-sectional views showing the shape of weld grooves in the conventional rib plate welding method. 10... Outer peripheral member, 13... Rib plate, 1
5... Welding groove, 17... Auxiliary member, 19... Recessed part, 21... Meeting part, 23... Welding groove, 25...
Welded metal.

Claims (1)

[Claims] 1. In a welding method for welding an internal reinforcing member such as a rib plate installed inside a closed cross-section box-shaped structural member to an outer peripheral member constituting the box-shaped structural member, one side edge of the internal reinforcing member A recess is formed in advance on the inner side of the outer circumferential member facing the pair of welding groove forming auxiliary members to be welded along the auxiliary member, so that when the welding rod is melted, a recess is formed at an obtuse angle between the inner side surfaces of both the auxiliary members, A welding method for an internal reinforcing member in a closed cross-section structural member, characterized by inserting a welding rod into the welding groove thus formed and welding by electroslag welding or electrogas welding. 2. The recess formed on the inner side of the outer circumferential member has a substantially trapezoidal shape, and a triangular meeting portion is provided between both ends of the substantially trapezoidal recess and both auxiliary members. A method for welding an internal reinforcing member in a closed cross-section structural member according to item 1.