JPH0623664U - Back plate metal for steel frame welding - Google Patents

Abstract

(57) [Abstract] [Purpose] This is a back plate metal that is interposed between both steel members to weld the steel members. Even if the amount of protrusion of the welding wire changes and the current becomes unstable, the welding strength does not decrease. Providing back metal plate. [Structure] By forming projections on the surface of the back sheet metal that serves as the welding surface, the substantial surface area of the surface is increased, and even when the current is low, these projections are completely melted to provide a strong welding strength. To achieve.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a back plate metal for welding a steel frame, such as a back plate metal of a column.

[0002]

[Prior art]

 Fig. 4 shows the state in which the diaphragm (b) is welded to the column (a), but as shown in the figure, there is a back plate metal (c) between the column (a) and the diaphragm (b). There is. That is, the column (a) is placed at a predetermined position, the tip is correctly positioned and the back sheet metal (c) is temporarily welded, and the above diaphragm (b) is also temporarily welded to the tip of the back sheet metal (c). Will end up. By interposing the back plate metal (c) in this way, the distance between the diaphragms (b) and (b) fixed at both ends of the column (b) becomes constant and is parallel to each other. The dimensional error of column (a) is covered by this back plate metal (c).

By the way, when welding the column (a) and the diaphragm (b) through the back plate metal (c), the weld metal is built up in the recess space (d). Has a shape with the corners cut to prevent defects in the fillet weld in the groove cross section. 5A to 5C are specific examples showing the cross-sectional shape of the back sheet metal (C). Here, when the cross-sectional shape is M = 25 mm and H = 9 mm, it is often cut into a size of a = 6 mm and b = 3 mm. When the corners are cut in this way, the tip of column (a) should be aligned with point A, which is the cut opening, but generally point A is ahead of the tip of the column due to an error in cutting column (a). It is often located at or on the rear side, which causes welding defects. In addition, this welding is carried out by a dedicated machine, and the amount of protrusion of the welding wire changes, which causes the current to become unstable, resulting in insufficient welding of the back plate metal and in some cases sufficient welding strength cannot be obtained. To do.

[0004]

[Problems to be solved by the present invention]

 As described above, the conventional back sheet metal has the above problems. The problems to be solved by the present invention are these problems. Even if the amount of protrusion of the welding wire changes and the current becomes unstable, insufficient welding of the back sheet metal is caused and the desired welding strength is obtained. The resulting back sheet metal is provided. Here, the target back plate metal is not limited to the case where the column and the diaphragm are connected.

[0005]

[Means for Solving the Problems]

 The back sheet metal of the present invention has a shape capable of melting even at a low current, and a mountain-shaped projection is continuously formed on the surface (welding surface) of the back sheet metal. The cross-sectional shape of the protrusion is not limited, and may be triangular, trapezoidal, or semicircular. The back sheet metal shall have a rectangular cross section without cutting the tip corners, and a small C surface shall be provided if necessary. By forming the chevron projections on the welding surface in this way, the surface area of the surface is enlarged, and as a result, the projections are completely melted even if the welding current is reduced, and sufficient welding strength is obtained. Hereinafter, an embodiment of a back plate according to the present invention will be described in detail with reference to the drawings.

[0006]

【Example】

 1a and 1b show an embodiment of a back metal plate 1 of the present invention, in which a surface 2 is formed with a series of triangular projections 3, 3, ... The back sheet metal 1 has a rectangular cross section having a horizontal dimension M and a vertical dimension H, and its length is L. However, the back sheet metal 1 may be bent into an L shape depending on the application. Both ends of the protrusions 3, 3, ... Form small C planes cut at 45 degrees as shown in b. The triangular protrusions 3, 3, ... All have the same size and are formed over the entire lateral width, and all the protrusions 3, 3, ... Are parallel to each other. By forming the projections 3, 3, ... On the surface 2 in this way, the substantial surface area is considerably expanded, and the thermal energy applied to the surface 2 is applied to both slopes 4, 4, ... Of the triangular projections 3, 3 ,. By acting, the protrusions 3, 3, ... Are relatively easily melted and integrated with the weld metal to be built up. Even if the same amount of heat is applied to the same flat surface as the back surface 5 as in the conventional case, the heat escapes to the main body of the back sheet metal 1 and it becomes difficult to melt the surface. As described above, the back sheet metal 1 of the present invention is obtained by enlarging the substantial surface area of the surface 2 to be the welding surface, and the triangular protrusions 3, 3, ... Are merely one means, and the protrusion shape is trapezoidal, square or Various shapes such as circular shapes are available.

FIG. 2 corresponds to FIG. 4 in a state where the back sheet metal 1 is temporarily welded to the column 6 and the diaphragm 7 is temporarily welded to the tip of the back sheet metal 1. The front surface 2 of the temporarily welded back sheet metal 1 is in contact with the rear surface 8 of the column 6, and is in contact with the rear surface 8 at the tip of the protrusion 3 with a slight contact surface. Although the welding method may be the same as the conventional method, the protrusions 3, 3 ... Easily penetrate even at a low current (230 A to 250 A), and the welding wire is integrated with the molten metal to form the column 6 and the diaphragm. Weld 7 firmly.

Although FIG. 3 shows the case where the connecting member 10 is welded to the side of the column member 9, the back sheet metal 1 of the present invention can also be used in this case. The back sheet metal 1 is temporarily welded to the diaphragm 7 of the column member 9 and the upper piece 11 of the connecting member 10 made of H-shaped steel, and the diaphragm 7 and the upper piece 11 are welded together via the back sheet metal 1. The protrusions 3, 3, ... On the upper surface of the back sheet metal 1 are completely melted, and strong welding strength is obtained. As described above, the back plate metal for steel frame welding of the present invention has the projections formed on the surface thereof, and the following effects can be obtained.

[0009]

[Effect of device]

 Since the back sheet metal of the present invention has protrusions formed on the surface which is the welding surface, the substantial surface area is enlarged, and as a result, these protrusions are completely melted and melted even when the current is low, and the deposits are built up. Sufficient weld strength can be obtained by integrating with the weld metal. Therefore, even if the welding current becomes unstable due to the change in the amount of protrusion of the welding wire, it has no effect on melting the protrusions, and stable and strong welding can be performed.

[Brief description of drawings]

1 is an embodiment showing a back plate of the present invention, a is a perspective view,
b is the A arrow view in a.

FIG. 2 shows a state in which a column and a diaphragm are temporarily welded using a back plate metal.

FIG. 3 shows a case where a connecting member is temporarily welded to a column member using a back plate metal.

FIG. 4 is a column material using a conventional back plate metal.

FIG. 5 is a specific example of a conventional back plate metal.

[Explanation of symbols]

 1 Back Plate Metal 2 Front Surface 3 Protrusion 4 Slope 5 Back Surface 6 Column 7 Diaphragm 8 Back Surface 9 Column Material 10 Connecting Member 11 Upper Piece

Claims (2)

[Scope of utility model registration request] 1. In a back sheet metal interposed between both steel frame members for welding a steel frame member, a projection is formed on a surface which is a welding surface of the back sheet metal to increase a substantial surface area of the surface. Characteristic steel plate welding back plate. 2. The back plate metal for steel frame welding according to claim 1, wherein the protrusions are formed in a mountain shape having a triangular cross section, and the triangular protrusions are continuously formed parallel to each other.