KR102093239B1 - Grating for improving weldability and method thereof - Google Patents

Abstract

The present invention can provide a grating and a manufacturing method of the frame or bearing-bars and cross-bars that are in close contact with each other and have high strength by excellent weldability and can be fixed.

Description

Grating with improved weldability and manufacturing method therefor {GRATING FOR IMPROVING WELDABILITY AND METHOD THEREOF}

The present invention relates to a grating with improved weldability and a method for manufacturing the same, and more specifically, a frame or bearing-bars and cross-bars are in close contact with each other, and the grating improved with weldability that can be fixed with high strength by excellent weldability and a method for manufacturing the same It is about.

In general, grating is widely used as a cover for rainwater drainage channels installed in roads, residential complexes, subways, and the like, and generally has a plurality of rectangular grid structures.

In recent years, as the industry has developed, it is widely used as a floor or stairs of structures such as chemical factories, shipyards, plant factories such as nuclear power plants, ships, and the like.

The grating of the rectangular grid structure consists of bearing bars and cross bars. The bearing bar and the crossbar are installed to partition the rectangular border of the grating at right angles to each other, and because the installation intervals of the two bars are different, the completed grid forms a rectangle. Then, the cross bar disposed between the bearing bars is fixed to the bearing bar or frame by welding.

However, in the prior art, the cross-bar is welded to the bearing-bar or frame.

In this case, since only the lower part of the cross-bar is fixed by welding, the space between the bearing-bar or the frame and the cross-bar is spaced apart. Therefore, there is a problem that the cross-bar cannot sufficiently support the load by only such lower welding. In addition, after the lower welding of the cross-bar to the bearing-bar or frame, for example, in the case of hot dip galvanizing, air is introduced into the space spaced between the bearing-bar or the frame and the cross-bar so that the air layer during hot dip galvanizing This is formed, and after the hot-dip galvanizing, a hole is generated in the air layer during the cooling process, so that the plating becomes incomplete, and thus, there is a problem that rust is generated in at least one of the bearing-bar, the frame, and the cross-bar.

Accordingly, there is a need for technical improvement of grating to provide weldability, which can ensure sufficient strength of grating to solve the above problems.

Patent Registration Publication No. 90-003386 (1990.05.18) Registered Utility Model Publication No. 20-0448098 (2010.03.18)

The present invention aims to solve the problems of the prior art as described above and the technical problems requested from the past.

The inventors of the present application have undergone in-depth studies and various experiments, and as described later, the weldability by which the cross-bar can be fixed to the bearing-bar or the frame is improved because the rigidity against the load is improved through welding by the welding projection. It is to provide provision for this improved grating and its manufacturing method.

In addition, another object of the present invention is to prevent the generation of an air layer when plating of a bearing-bar, frame or cross-bar, so that the plating is complete, providing a grating with improved weldability that can prevent rust and a method for manufacturing the same will be.

Grating with improved weldability according to the present invention for achieving this object includes a frame in which an internal space is formed;

A plurality of bearing bars arranged at predetermined intervals in the interior space of the frame; And

It includes a plurality of cross bars (cross bar) disposed in the space between the bearing bars,

A plurality of welding protrusions may be formed on a portion of the frame, the bearing bar and the cross bar in surface contact, and a guide groove may be formed on the bearing bar in a surface contact with the cross bar.

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Here, in one preferred example of the present invention, the welding protrusion may be formed in a vertical direction around an imaginary vertical line.

In one preferred example of the present invention, the cross bar may be welded to the welding protrusions to be combined with at least one of the frame and the bearing bar.

In one preferred example of the present invention, a plating layer may be formed on at least one of the frame, the bearing bar, and the cross bar.

Here, in one preferred example of the present invention, the plating layer may be a hot-dip zinc plating layer.

In addition, the present invention provides a method for manufacturing the above-mentioned grating, and provides a grating manufacturing method in which the welding projections are melted and fused to join.

In one preferred example of the present invention, the welding projection may be melted by spot welding.

On the other hand, the present invention provides a grating welding apparatus including a heating unit for heating and melting the welding projections of grating.

In one preferred example of the present invention, the heating unit comprises: a heating unit contacting the cross-bar;

A support portion coupled to the heating portion; And

It may be configured to include; a body portion to which the support portion is coupled.

In one preferred example of the present invention, the heating parts may be provided in a pair of structures facing each other.

As described above, the grating with improved weldability according to the present invention and its manufacturing method have the effect that the cross-bar can be fixed to the bearing-bar or the frame because the rigidity against the load is improved through welding by welding projections.

In addition, the grating with improved weldability according to the present invention and a method for manufacturing the same have an effect of preventing generation of an air layer when plating of a bearing-bar, frame or cross-bar, so that plating is completed and rust is prevented.

1 is a perspective view showing a part of grating with improved weldability according to an embodiment of the present invention;
2 is an exploded perspective view of a bearing-bar and a cross-bar in grating with improved weldability according to an embodiment of the present invention;
3 is a perspective view of a bearing-bar and a cross-bar combined for welding in grating with improved weldability according to an embodiment of the present invention;
4 is an exploded perspective view of a bearing-bar and a cross-bar in grating with improved weldability according to another embodiment of the present invention;
5 is a cross-sectional view of a state in which the bearing-bar and the cross-bar are contacted before welding by a welding protrusion in grating with improved weldability according to an embodiment of the present invention;
6 is a cross-sectional view of a bearing-bar and a cross-bar welded by a welding protrusion in grating with improved weldability according to an embodiment of the present invention;
7 is a perspective view of a plurality of cross-bars being simultaneously pressed against and coupled to a bearing-bar in grating with improved weldability according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art to which the present invention pertains can easily practice. However, the examples are not intended to limit the scope of the present invention, which should be interpreted as to aid understanding of the present invention.

The terms used in the examples are only used to describe specific examples, and are not intended to limit the examples. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, terms such as “include” or “have” are intended to indicate that there are features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, and one or more other features. It should be understood that the existence or addition possibilities of fields or numbers, steps, operations, components, parts or combinations thereof are not excluded in advance.

On the other hand, in the description of the present invention, when it is determined that a detailed description of related known functions or configurations may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted. In addition, terms used in the present specification (terminology) are terms used to properly represent an embodiment of the present invention, which may vary according to a user, an operator's intention, or a custom in a field to which the present invention pertains. Therefore, definitions of these terms should be made based on the contents throughout the present specification.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person skilled in the art to which the embodiment belongs. Terms, such as those defined in a commonly used dictionary, should be interpreted to have meanings consistent with meanings in the context of related technologies, and should not be interpreted as ideal or excessively formal meanings unless explicitly defined herein. Does not.

In addition, in the description with reference to the accompanying drawings, the same components are given the same reference numerals regardless of the reference numerals, and redundant descriptions thereof will be omitted. In describing the embodiments, when it is determined that detailed descriptions of related known technologies may unnecessarily obscure the subject matter of the embodiments, detailed descriptions thereof will be omitted.

Hereinafter, preferred embodiments of the present invention will be described in detail in order to enable those skilled in the art to easily implement the present invention.

As described above, in the conventional grating welding method, there is a limit to the production of grating capable of ensuring the rigidity of the welding site due to the inefficient position of the welding site.

Accordingly, in the present invention, unlike the conventional grating lower welding method, by providing the welding surface on which the welding protrusion is formed so that the cross bar can sufficiently support the load, the weldability is significantly improved compared to the conventional grating welding rigidity, thereby solving the above-mentioned problems. The solution was sought.

1 is a perspective view showing a part of grating according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view of a bearing-bar and a cross bar in grating according to an embodiment of the present invention. 3 schematically shows a perspective view in which a bearing bar and a cross-bar are combined for welding in grating according to an embodiment of the present invention.

1 to 3, the grating 10 according to the present embodiment includes a frame 100, bearing-bars 200, cross-bars 300, and welding projections 400. Includes.

The frame 100 may be formed in a substantially square to rectangular shape to provide an empty space, but is not limited thereto, and may be deformed into a circular shape, an elliptical shape, a rhombic shape, a triangle, etc. without departing from the scope of the present invention. Will be fully understood by those skilled in the art. When the frame 100 is formed in a rectangular shape, the length and width of the frame 100 can be changed according to the place to be installed or the size of the place of use.

The frame 100 may be made of, for example, a metal material such as flat steel or stainless steel, and the frame 100 may include two short sides frames 120 and two long sides frames 110, and , The edges of the short side frames 110 and 120 may be combined in a manner such as welding. Of course, the frame 100 may be formed integrally.

In addition, the frame 100 may be changed to a different size depending on the purpose of the grating 10 or the installation location.

The plurality of bearing-bars 200 may be installed in various shapes in the empty space of the frame 100. For example, a plurality of bearing-bars 200 may be arranged to have a predetermined spacing, for example, equal spacing. Here, each bearing-bar 200 is installed at predetermined intervals along the long side frame 110 of the frame 100 to partition the internal space of the frame 100, as well as to reinforce the bearing capacity of the grating 10. have. The bearing-bars 200 are positioned at the same reference plane as the frame 100, for example, the bearing-bars 200 are framed at both ends so that their tops are located on the same plane as the tops of the frames 100. 100). It is preferable to be installed on the inner wall of the frame 100 by welding both ends of the bearing-bar 200, but if necessary, it may be combined by a combination of projections or grooves, or may be integrally processed with the frame 100.

Each of the bearing-bars 200 of the bearing-bar 200 on the same reference surface as the frame 100, for example, on the upper surface of the frame 100, at predetermined intervals in the empty space of the quadrangular shape of the frame 100 It can be arranged so that the top surface is located. In addition, the spacing or pitch between the bearing-bars 200 is constant, but may be adjusted as necessary. The material of the bearing-bar 200 may be the same as the frame 100, or a metal of a weaker material may be used. The thickness of the bearing-bar 200 can be designed to meet the required load conditions.

The cross-bars 300 may be installed between each of the bearing-bars 200 disposed adjacent to each other, or may be installed between the frame 100 and the bearing-bar 200, respectively. Here, the cross-bar 300 may be installed in a zigzag form between the bearing-bars 200 or between the bearing bar and the frame 100. Specifically, each cross-bar 300 is installed at predetermined intervals along the long side frame 110, for example, a zigzag-shaped triangular shape such as a triangle or a round shape such as a semi-circle shape may be used. You can. That is, the cross-bar 300 is installed between neighboring bearing-bars 200, or between the bearing-bars 200 and the frame 100, and the angular or rounded portions of the cross-bars 300 The part may be installed to contact the bearing-bar 200 and the inner surface of the frame 100. Both ends of each cross-bar 300 in the longitudinal direction are coupled to the inner wall of the short-side frame 120, and the surface contact portion 310 of the cross-bar 300 is a frame

It may be coupled to the inner surface of the (100) or the inner wall of the bearing-bar 200.

Each of the cross-bars 300 is arranged so that one end in the height direction is the same as the reference surface, for example, so that the top surface of the cross-bar 300 is the same height as the top surface of the frame 100 and the bearing-bar 200. It may be installed between each of the neighboring bearing-bars 200, or between the frame 100 and the neighboring bearing-bars 200, respectively.

The welding protrusion 400 is a frame 100 or a bearing-bar 200 and a contact portion of the frame 100 and the cross-bar 300, or a bearing-bar, to couple the cross-bar 300 It may be formed in the contact portion of the 200 and the cross-bar 300. One or more welding protrusions 400 may be formed, for example, three to four welding protrusions 400 may be formed. However, the number of welding projections 400 is not limited to this, and may be changed as necessary. Here, the welding protrusion 400 may be formed on the frame 100, may be formed on the bearing-bar 200, or may be formed on the cross-bar 300. However, for convenience of description, the following description will focus on the case where the welding projection 400 is formed on the cross-bar 300.

The welding protrusion 400 may be formed on the surface contact portion 310 provided on the side surface of the cross-bar 300. That is, the cross-bar 300 may be formed of a surface contact portion 310 that is in surface contact with the side of the frame 100 or the bearing-bar 200, and the welding projection 400 is of the cross-bar 300 A welding protrusion 400 formed on the cross-bar 300 when the cross-bar 300 contacts the frame 100 or the bearing-bar 200 may be formed on the surface contact part 310, and the frame 100 ) Or the bearing-bar 200. Here, as described later, the welding protrusion 400 is heated so that the cross-bar 300 can be combined with the frame 100 or the bearing-bar 200, whereby the cross-bar 300 is a frame ( 100) or because the bearing-bar 200 can be tightly coupled, the rigidity is improved and the plating quality is increased.

When a plurality of welding protrusions 400 are formed, they may be arranged in a line in the surface contact portion 310 of the cross-bar 300, and in particular, in the vertical direction. However, the present invention is not limited thereto, and the plurality of welding protrusions 400 may be arranged in a plurality of arrangements, such as 2 to 3 rows, or may be arranged in a left-right direction, arranged side by side, or staggered to a constant shape. It may be randomly arranged without.

The welding protrusion 400 may be made of various materials that can be heated and melted. As the welding protrusion 400 is spot-welded and melted, the frame 100 and the cross-bar 300 are combined, or the bearing-bar ( 200) and the cross-bar 300 may be combined. There is an advantage in that the combination of the frame 100 or the bearing-bar 200 and the cross-bar 300 may be automated as described below by spot welding. In the present invention, the welding protrusion 400 is described as being welded by spot welding, which is a heating welding method, but is not limited thereto. For example, the welding protrusion 400 may be a non-heating welding welding, or arc welding. ), Gas welding and electric welding may also be applied.

4 is a schematic perspective view of a bearing-bar and a cross-bar in grating with improved weldability according to another embodiment of the present invention.

Referring to FIG. 4, the grating 100 includes the frame 100, the bearing-bars 200, the cross-bars 300, and the surface contact portion 311 on which the welding projections 400 are formed. It consists of.

Here, the bearing-bar 200 has a plurality of guide grooves 201 are formed at predetermined intervals, and the cross-bar 300 of the grating 100 takes into account the more firm adhesion of the bearing-bar 200 Since it is the same as described above, except that the flat surface contact portion 311 is formed, a description of the overlapped portion will be omitted.

Therefore, in the grating 100 according to another embodiment of the present invention, when the bearing-bar 200 and the cross-bar 300 are joined, the surface contact portion 311 is formed flat so that the welding projection 400 is formed. When melted, adhesion can be secured, and thus better weldability can be obtained. Further, when the welding projection 400 is melted, the welding projection 400 is melted and the molten metal formed is introduced into the guide groove 201 even if it flows out or flows out. Inflow phenomenon can be fundamentally prevented.

5 shows a cross-sectional view of a bearing-bar and a cross-bar in contact with a welding protrusion before welding in grating according to an embodiment of the present invention, and FIG. 6 shows a bearing in grating according to an embodiment of the present invention- A cross-sectional view of a bar and a cross-bar welded by a welding projection is schematically illustrated.

5 to 6 together with FIGS. 1 to 3, the welding protrusion 400 of the cross-bar 300 is pressed in the direction of the arrow P or the arrow P 'while being in contact with the bearing-bar 200 When heated, and the welding projection 400 is heated and melted, the cross-bar 300 may be tightly coupled to the bearing-bar 200 as shown in FIG. 6. Here, the welding projection 400 may be heated by the grating welding apparatus 500 including the heating unit 510, and a detailed description of the grating welding apparatus 500 will be described later. In addition, when the cross-bar 300 is coupled to the bearing-bar 200, plating may be formed on the cross-bar 300 and the bearing-bar 200. Here, the plating includes various forms, and may be, for example, hot-dip galvanized.

In the case of conventional grating, when the cross-bar 300 is welded to the bearing-bar 200, the lower part of the cross-bar 300 is welded and fixed, so that the bearing-bar 200 cross-bar 300 Are separated. That is, since the side surfaces of the bearing-bar 200 and the cross-bar 300 are separated from each other, there is a problem that it is difficult to sufficiently support the load, and also, when plating, the bearing-bar 200 and the cross-bar 300 There was a problem in that rust was generated due to incomplete plating due to the formation of an air layer between spaces.

However, in the grating 10 according to an embodiment of the present invention, the side portions of the cross-bar 300 and the bearing-bar 200 are completely tightly coupled through the welding protrusions 400 formed on the cross-bar 300. Therefore, as compared with the conventional grating, the stiffness is increased to support a sufficient load, and an air layer is not formed upon plating by close bonding, so that complete plating is possible, thereby preventing rust from occurring in the grating 10. have.

Specifically, referring to Figure 2, the cross-bar 300 is formed with a welding projection 400, referring to Figure 4, the cross-bar 300, the welding projection 400 of the bearing-bar 200 While being heated and melted in contact with the cross-bar 300 and the bearing-bar 200 as shown in FIG. Thereby, the rigidity of the grating 10 according to an embodiment of the present invention is increased, and there is an effect that the plating quality is improved. And, the coupling of the cross-bar 300 and the frame 100 is also closely coupled by the welding projections 400 formed on the cross-bar 300, similarly to the cross-bar 300 and the bearing-bar 200. Can be.

Hereinafter, the grating production process with improved weldability according to an embodiment of the present invention will be described in more detail.

Referring to FIGS. 2 to 3 and 5 to 6, as in the grating 10 according to an embodiment of the present invention described above, the welding protrusion 400 may be formed on the frame 100 , It may be formed on the bearing-bar 200, or may be formed on the cross-bar 300, for convenience of description, the center of the welding projection 400 is formed on the cross-bar 300 below for convenience of explanation. As described.

The frame 100 or the bearing-bar 200 is disposed, and the cross-bar 300 is disposed. Since the method of coupling the cross-bar 300 to the frame 100 or the bearing-bar 200 is basically common, hereinafter, the method of combining the bearing-bar 200 and the cross-bar 300 will be mainly described. In the description, the method in which the frame 100 and the cross-bar 300 are combined is replaced with a description of the method in which the bearing-bar 200 and the cross-bar 300 are combined.

After the bearing-bar 200 is disposed, the cross-bar 300 and the bearing-bar 200 contact each other. Here, the contact between the cross-bar 300 and the bearing-bar 200 may be made in various ways. For example, the operator may manually contact the cross-bar 300 and the bearing-bar 200 by hand, or a pressing unit (not shown) for pressing the bearing-bar 200 or the cross-bar 300 City) may be in contact with the cross-bar 300 and the bearing-bar 200 by an automated device (not shown).

After the cross-bar 300 contacts the bearing-bar 200, the cross-bar 300 is pressed against the bearing-bar 200. Here, the operator may manually press the cross-bar 300 or the bearing-bar 200, or the cross-bar 300 by an automation device (not shown) including a pressing unit (not shown) Alternatively, the bearing-bar 200 may be pressed. The contact and pressurization of the cross-bar 300 and the bearing-bar 200 may be performed simultaneously, or may be performed at a time interval.

The welding protrusion 400 formed on the cross-bar 300 is heated, and the heated welding protrusion 400 is melted, so that the bearing-bar 200 and the cross-bar 300 may be closely coupled. Here, the grating welding apparatus 500 including the heating unit 510 may heat the welding projection 400 through the space 320 (see FIG. 3) formed in the zigzag cross-bar 300. Meanwhile, the automation device (not shown) including the above-described pressing unit (not shown) may also include the grating welding device 500 including the heating unit 510, and is crossed by the automation device (not shown). -The contact between the bar 300 and the bearing-bar 200, pressurization, and heating may be performed to enable automated production. Meanwhile, if necessary, a grating welding apparatus 500 including a pressing unit (not shown) and a heating unit 510 may be integrally provided, and pressurization and heating may be performed together.

On the other hand, as described above, the cross-bar 300 may be a surface contact portion 310 that is in surface contact on the side of the bearing-bar 200, the welding projection 400 of the cross-bar 300 It may be formed on the surface contact portion 310 provided on the side, and the cross-bar 300 is provided in the state in which the grating welding device 500 is in surface contact with the bearing-bar 200 to heat the welding projection 400 Can be. Thereby, since the cross-bar 300 can be completely and tightly coupled with the bearing-bar 200, rigidity can be improved.

In addition, when the combination of the frame 100, the bearing-bar 200, and the cross-bar 300 is completed, plating may be performed by various methods, for example, hot dip galvanizing.

Figure 7 is a perspective view of a plurality of cross-bars in the grating according to an embodiment of the present invention is simultaneously pressed against the bearing-bar.

Cross-bar 300 may be coupled to the bearing-bar 200 one by one, as shown in Figure 7, two cross-bars (300a, 300b) on each side of one bearing-bar 200, respectively In contact, the two cross-bars 300a and 300b may be simultaneously pressed in the direction facing each other with respect to the bearing-bar 200 around the bearing-bar 200.

That is, based on FIG. 7, the cross-bar 300a contacting the left side of the bearing-bar 200 is pressed toward the right side (see arrow H1), and the cross-contacting right side of the bearing-bar 200 is applied. The bar 300b is pressed toward the left side (see arrow H2). Thereby, since two cross-bars 300a and 300b are simultaneously coupled to both sides of one bearing-bar 200, the working time is shortened.

Hereinafter, the configuration of the grating welding apparatus 500 with improved weldability according to an embodiment of the present invention will be described in more detail, as in the grating 10 according to an embodiment of the present invention described above, the welding projections. The 400 may be formed on the frame 100, may be formed on the bearing-bar 200, or may be formed on the cross-bar 300, but for convenience of description hereinafter, the welding projection ( 400) will be mainly described as being formed on the cross-bar 300

Referring to FIG. 7, the grating welding apparatus 500 according to an embodiment of the present invention may heat the welding projection 400 in various ways, for example, contacting the cross-bar 300 to heat conduction. It may include a heating unit 510 for heating the welding projection 400 by.

The heating unit 510 may include a heating unit 511, a supporting unit 512, and a main body 513. The main body 513 is coupled to the support portion 512 and is connected to various driving devices and can be moved up, down, left, and right. The support part 512 may connect the main body 513 and the heating part 511 and support the heating part 511. The heating unit 511 may generate heat in various ways and may contact the cross-bar 300 to heat the cross-bar 300. For example, the heating unit 511 may heat the welding projection 400 through the space 320 (see FIG. 7) formed in the zigzag cross-bar 300. And, the heat provided to the cross-bar 300 is transferred to the welding protrusion 400 formed on the cross-bar 300 by heat conduction, thereby heating and melting the welding protrusion 400. As illustrated in FIG. 6, a plurality of heating units 511 may be provided.

Here, the plurality of heating units 511 may be arranged to be spaced apart at predetermined intervals, for example, to be spaced apart to correspond to the spacing between the surface contact portions 310 of the cross-bar 300, and the plurality of heating units ( 511) may be in contact with the surface contact portions 310 of the cross-bar 300, respectively. In FIG. 7, three heating units 511 are illustrated, but the present invention is not limited thereto, and the number of heating units 511 may vary. When a plurality of heating units 511 are provided, it is possible to simultaneously contact and heat various parts of the cross-bar 300, thereby reducing the working time. In addition, the heating unit 511 may be provided as a pair facing each other. That is, when two cross-bars 300a and 300b are respectively contacted to both sides of one bearing-bar 200 as shown in FIG. 7, the pair of heating units 511a and 511b are two cross- Bars (300a, 300b) can be heated in contact with each other, whereby two cross-bars (300a, 300b) are coupled to both sides of one bearing-bar (200) at the same time, which shortens the working time. It works.

The embodiments of the present invention have been described above with reference to the accompanying drawings, but those of ordinary skill in the art to which the present invention pertains can implement the present invention in other specific forms without changing its technical spirit or essential features. You will understand that there is. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive.

Therefore, the spirit of the present invention should not be limited to the above-described embodiments, and should not be determined, but all claims that are equally or equivalently modified with the claims as described below belong to the scope of the spirit of the present invention. will be.

10: Grating 100: Frame
110: long side frame 120: short side frame
200: bearing-bar 201: guide groove
300: cross-bar 310, 311: surface contact
320: space 400: welding projection
500: grating welding device 510: heating unit
511: heating section 512: support
513: body

Claims (12)

A frame in which an interior space is formed;
A plurality of bearing bars arranged at predetermined intervals in the interior space of the frame; And
It includes a plurality of cross bars (cross bar) disposed in the space between the bearing bars,
A plurality of welding protrusions are formed on the crossbar in a portion in contact with the frame and the bearing bar,
The bearing bar is a grating with improved weldability in which a guide groove is formed in a portion in contact with the crossbar.
delete delete According to claim 1,
Grating with improved weldability, characterized in that the welding projection is formed in a vertical direction around a virtual vertical line.
According to claim 1,
The crossbar grating is improved weldability, characterized in that the welding projections are welded and coupled to at least one of the frame and the bearing bar.
According to claim 1,
Grating with improved weldability, characterized in that a plating layer is formed on at least one of the frame, the bearing bar, and the crossbar.
The method of claim 6,
The plating layer is grating improved weldability, characterized in that the hot-dip galvanized layer.
A method for producing grating with improved weldability by melting and welding the welding projections of any one of claims 1 to 4 to 7.
The method of claim 8,
The welding projection is grating manufacturing method characterized in that it is melted by spot welding (spot welding).
A grating welding apparatus comprising a heating unit for heating and melting the welding projections of any one of claims 1 and 4 to 7.
The method of claim 10,
The heating unit,
A heating unit contacting the crossbar;
A support portion coupled to the heating portion; And
Grating welding apparatus comprising a; body portion to which the support is coupled.
The method of claim 11,
The heating unit is a grating welding apparatus, characterized in that provided in a pair of structures facing each other.

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