JPS6163377A - Welding method for internal reinforcement members in closed cross-section structural members - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method for welding reinforcing members such as rib plates and diaphragms inside closed-section box-shaped structural members such as column members in various steel structures. It is something.

[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 numbering and welding reinforcing parts such as rib plates to the inside of such a box-shaped column member, for example, as shown in FIG. 2, 2 are welded together, and both auxiliary members 2,
A weld formed between both auxiliary members 2 and 2 with the tip of 2 in contact with the inner surface of the outer circumferential member 3 forming a closed cross section. F
A method (Japanese Patent Publication No. 45-20368, etc.) has been proposed to perform electroslag contact by inserting a contact member 5 into the electroslag 74 for the convenience of consumers.

By the way, in a structure that has a welded part inside a closed cross-section box-shaped structural member, the state of the welded part cannot be seen from the outside of the structural member, so after welding, it is impossible for all the welded metal in all the welding lines to disappear. It is unclear whether or not the penetration was uniform. This means that, for example, the fifth
As shown in Figure a, in a preferred form of electroslag welding, the welding rod 5 is moved in a concentric circle R1 within the welding groove 4 between the two auxiliary members 2, 2 with the center P of the welding a4 as the center. As shown in Fig. 5b, when the thickness of the rib plate 1 is a predetermined thickness, for example, 22 mm or more, the width H of the weld 'a4
As a result, the melting of the welding rod within the welding groove 4 is not performed evenly, and as a result, a weld metal penetration rate foot 6 is formed at the corner of the welding groove 4.

Furthermore, even in the case of welding in a preferable form as shown in FIG. If the welding current is temporarily fluctuated 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 R2 smaller than the appropriate concentric circle R1
The melt may occur in this state, and a penetration rate foot portion 6 may occur at the right-angled corner portion.

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

Therefore, the inventor conducted intensive research to find a welding method in which the deposited metal melts evenly in the welding groove and does not cause penetration rate toe. The desired purpose can be achieved by forming recesses on the inner side of the outer peripheral member facing the auxiliary member such that when the welding rod is melted, an obtuse angle is formed between the inner surfaces of both the auxiliary members. I figured it out.

[Purpose 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, thereby preventing the occurrence of a penetration area.

(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 cross-section box-shaped structural member to an outer circumferential member constituting the box-shaped structural member. A recess is formed in advance on the inner side of the outer circumferential member facing a pair of welding groove forming auxiliary members welded along the side edges so that when the welding rod is melted, an obtuse angle is formed between the inner surfaces of both auxiliary members. However, it 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 four parts formed on the inner side of the outer circumferential member have a substantially trapezoidal shape, and that a triangular meeting part 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, an outer peripheral member 1 forming a box-shaped structure with a closed cross section.
When welding the rib plate 13 to predetermined internal locations of 0a, 1Ob, IOc, and 10d, first, a pair of auxiliary members 17 for forming weld grooves 15 on both sides of one side edge 13a of the rib plate 13, Weld 17. 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 point of s#4.
Fillet welding is performed so that the angle is 5°, and the edge 13a
and the auxiliary member 17 have a rounded obtuse cross section (third
(see figure).

Next, three side edges 13b of this rib plate 13,
13c and 13d are welded to the inner surfaces of the three outer circumferential members tob, 10c and 10d, which have been previously formed to have an open cross section, and the open cross section is further closed by the remaining outer circumferential member 10a, thereby forming the outer circumferential member 10a and the groove plate 1.
The side edge portions 13a of No. 3 are welded by electroslag welding or the like. In this case, when welding is performed on the inner side of the outer peripheral member 10a facing the side edge 13a,
A recess 19 is formed in advance such that an obtuse angle is formed between this inner side and each inner side end of the auxiliary member 17. As is clear, for example, the inner surface of the outer circumferential member 10a is formed into a substantially trapezoidal shape, and there are triangular meeting portions between both ends of the trapezoidal recess 19 and each inner end 18, 1B of the auxiliary member 17°17. 21 (shaded area in Figure 3) is provided.

Outer peripheral member 10a configured in this way
3, the welding a
The welding rod 23 is inserted into the welding rod 15 and the welding rod 23 is energized. In this case, since the meeting part 21 is melted before other parts by the heat of fusion, each inner end of each auxiliary member 17, 17 and the recess 19 formed in the outer peripheral member 10a form an obtuse angle. Therefore, the weld metal 25 is in the weld groove 1.
5, it is possible to uniformly melt concentrically from the center P, thereby preventing the occurrence of insufficiently penetrated parts as in the conventional case. Note that since the welded portion between the edge 13a of the rib plate 13 and the auxiliary member 17.17 also has an obtuse cross section, it plays the same shape role as the meeting portion 21.

〔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 when there is an imbalance in welding heat input due to fluctuations in welding current, t
The fifth
It is possible to reliably eliminate the lack of welding in the corners, which occurs in the conventional welding method of this type shown in Figure b. Therefore, during electroslag welding or electrogas welding, it is possible to prevent the deposited metal from reaching the inner peripheral surface of the weld groove. This method has the advantage that rib plates can be welded in an appropriate closed-section box structure with uniform penetration and no insufficient penetration.

Although the preferred embodiments of the welding method for the internal structural members 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 invention. Of course, various modifications can be made.

[BRIEF DESCRIPTION OF THE DRAWINGS] 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 partially cutaway perspective view showing the shape of the welding groove in the rib plate welding method of the present invention. FIG. 3 is a partially enlarged sectional view of FIG. 2, FIG. 4 is a partially cutaway perspective view showing the component structure of the riff plate welding method in a conventional closed-section box structure, FIG. 5a, and FIG. FIG. 5b is a partial sectional view showing the shape of a welding groove in the conventional glue foot welding method. DESCRIPTION OF SYMBOLS 10... Outer peripheral member, 13... Rib plate, 15... Welding groove, 17... Auxiliary member, 19... Concavity, 21 ... Meeting part, 23 ... Weld groove, 25 ... Weld metal.

Claims (2)

[Claims] (1) In a welding method in which an internal reinforcing member such as a rib plate attached to the inside of a closed cross-section box-shaped structural member is welded to an outer circumferential member constituting the box-shaped structural member, welding is performed along one side edge of the internal reinforcing member. A recess is formed in advance on the inner side of the outer peripheral member facing the pair of welding groove forming auxiliary members to form an obtuse angle between the inner surfaces of both auxiliary members when the welding rod is melted. A welding method for internal reinforcing members in closed cross-section structural members, characterized by inserting a welding rod into a formed welding groove and welding by electroslag welding or electrogas welding. (2) The recess formed on the inner side of the outer peripheral 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 scope 1.