JP2002001530A - Molten metal plated and welded h-shape steel and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve such problem as not to be able to surely repair exfoliation of a molten metal plated film on a contact or a junction with a feeding tip during welding. SOLUTION: A molten metal plated and welded H-shape steel 13 is manufactured by jointing by welding two flange materials 6 and a web 1 made of steel sheets having the molten metal plated film, and has a metallic thermal spraying film comprising the molten metal plated film on an exfoliation part of the molten metal plated film cause by welding.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot-dip galvanized welded H-section steel and a method for producing the same, and for example, manufactures a hot-dip galvanized welded H-section steel and a hot-dip galvanized steel alloy-plated welded H-section steel, etc. The present invention relates to a molten metal plated welded H-shaped steel in which measures against peeling of the molten metal plated film are sufficiently taken when performing the method, and a method of manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, a welded H-section steel has been used as a building structural material for ordinary houses. In recent years, some wood-based house makers have promoted the use of steel for building structural materials, and steel-based house makers who have traditionally used welded H-section steel have been aiming for high durability. For example, hot-dip galvanized welded H-section steel and hot-dip galvanized steel-5% ("%" means "% by mass" unless otherwise specified)
There has been an increasing demand for welded H-beams such as aluminum alloy plated welded H-beams.

[0003] These welded H-section steels are manufactured by joining two flange members made of a steel strip having a molten metal plating film and a web member by welding, and a power supply tip for heating prior to welding. Abutment part (feed trace)
In addition, at the joint between the flange material and the web material, the plating disappears, and the corrosion resistance, which is regarded as important as a building structural material, cannot be sufficiently maintained.

[0004] Therefore, in general, painting repair is performed on the disappearance of the plating that occurs at the trace of the power supply and at the joint. For example, Japanese Patent Application Laid-Open No. 7-9151 discloses an invention in which a joint of a hot-dip galvanized welded H-section steel formed by welding a flange material and a web material made of a hot-dip galvanized steel strip is zinc-coated using a coating machine. Has been proposed.

[0005]

However, in the zinc coating using a coating machine, the adhesion of zinc in the zinc-coated portion is low, and for example, peeling of the zinc-coated portion due to contact during transportation of the product is inevitable and inevitable. Occurs. in this way,
Even if repair is performed by applying zinc coating to the contact part and joint part with the power supply chip at the time of welding, peeling of the painted part occurs due to insufficient adhesion of the zinc coating, and hot-dip galvanizing It cannot exhibit the excellent rust prevention performance inherently possessed by the coating.

An object of the present invention is to provide a technique capable of reliably repairing the peeling of a molten metal plating film at a contact portion or a joint portion with a power supply chip at the time of welding. An object of the present invention is to provide a molten metal plated welded H-shaped steel which can sufficiently exhibit the excellent rust prevention performance inherent in a coating film and is suitable for use as, for example, a building structure material of a general house, and a method for producing the same.

[0007]

SUMMARY OF THE INVENTION The present invention is directed to two flange materials and a web material comprising a hot-dip galvanized steel strip or a hot-dip galvanized steel strip, such as a hot-dip zinc-5% aluminum alloy-plated steel strip. When manufacturing molten metal plating welded H-section steel by welding and welding, the metal forming the molten metal plating film (in the case of hot dip galvanized film) Is based on a new and important finding that the above problem can be solved by spraying zinc).

[0008] The present invention is a hot-dip metal-welded H-section steel produced by welding two flange members each made of a steel strip having a hot-dip metal plating film and a web material, and the welding is accompanied by this welding. A molten metal-plated welded H-section steel, comprising a sprayed coating of a metal constituting the molten metal-plated film at a part where the molten metal-plated film is peeled off.

The molten metal plating welding H according to the present invention
In the section steel, the peeling part of the molten metal plating film due to welding,
Exemplified is at least one of a contact portion with a power supply tip for heating the two flange members and / or the web member during welding, and a joint portion between the two flange members and the web member. .

[0010] From another viewpoint, the present invention relates to a method of heating by energizing a power supply tip by contacting at least one of two flange materials and a web material made of a steel strip having a hot-dip metal plating film with a current. When manufacturing a molten metal plating welded H-section steel by performing welding afterwards, the metal forming the molten metal plating film is thermally sprayed on a peeled portion of the molten metal plating film accompanying the welding. This is a method for producing a metal-plated welded H-section steel.

The molten metal plating welding H according to the present invention
In the manufacturing method of the shaped steel, the shape of the power supply tip is devised to form the power supply trace close to the joint, and before the thermal spraying, the power supply trace and the joint are heated to a temperature at which the adhesion of the sprayed metal can be secured by spraying. Both are desirable to be heated.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of a method for producing a hot-dip metal-welded H-section steel according to the present invention will be described in detail with reference to the accompanying drawings. In the following description of the embodiments, a case where the hot-dip metal-plated welded H-section steel has a flange material and a web material made of a hot-dip galvanized steel strip or a hot-dip zinc-5% aluminum alloy-plated steel strip will be described as an example. .

FIGS. 1 and 2 are explanatory views schematically showing the outline of the manufacturing method of the present embodiment. In this embodiment, as shown in FIG. 1, in step (hereinafter simply referred to as “S”) 1, a steel strip 2 made of a hot-dip galvanized steel strip or a hot-dip zinc-5% aluminum alloy-plated steel strip is used.
One flange material and one web material are continuously supplied to an H-section steel welding machine.

Next, in step S2, the shape of the power supply tip for heating the welded H-section steel is devised as described later to form the power supply tip on the surface of each of the two flange members and the one web member. The power supply trace is formed close to the joint between the two flange materials and one web material,
One piece of flange material and one piece of web material are joined by welding.

In step S3, the power supply traces formed on the surfaces of the two flange members and the one web member and the joint between the two flange members and the one web member are subjected to zinc spraying (zinc spraying). 95-100%, aluminum 0
5%) to repair.

Further, in this embodiment, as shown in FIG. 2, between S2 and S3 in FIG.
The power supply trace and the joint of the welded H-section steel may be heated by a heating device to a temperature suitable for thermal spraying, that is, a temperature at which adhesion of zinc can be ensured by zinc spraying.

Each of the hot-dip galvanized welded H-section steel and the hot-dip galvanized-5% aluminum alloy plated welded H-section steel obtained by the method shown in FIG. 1 or FIG. A contact portion with a power supply tip for heating the two flange materials and the web material during welding, which is a peeled portion of the -5% aluminum alloy plating film, and a joint portion between the two flange materials and the web material In addition, a sprayed coating of zinc constituting these plating films is formed.

For this reason, the adhesion of the portion where the sprayed zinc coating is formed is extremely high, and the sprayed zinc coating does not peel off, for example, even if contact occurs during transportation of the product.
As described above, according to the present embodiment, the repair is performed by forming the sprayed zinc coating on the contact portion between the power supply tip and the junction between the two flange members and the web member at the time of welding. Adhesiveness can be sufficiently ensured, and the excellent rust prevention performance inherent in the hot-dip galvanized coating can be sufficiently exhibited for a long period of time.

Next, an example of an apparatus for carrying out the present embodiment will be described. FIG. 3 is an explanatory view of an apparatus 1 for carrying out the present embodiment. FIG. 3 (a) is a top view, FIG.
(B) is a front view.

As shown in FIGS. 3A and 3B, the apparatus 1 of the present embodiment includes a first heating device 2, a welding machine 3, a second heating device 4, Device 5. Therefore, these components of the device 1 of the present embodiment will be sequentially described.

[First Heating Apparatus 2] FIG. 4 is a sectional view of FIG.
It is AA sectional drawing in. As shown in FIGS. 3 and 4, two flange members 6 and one web member 7 made of a hot-dip galvanized steel strip or a hot-dip zinc-5% aluminum alloy-plated steel strip are continuously fed. . The two flange members 6 and the one web member 7 are combined by welding in a welding machine 3 described later in an H-shaped cross section.

As shown in FIG. 4, the first heating device 2
It has a pair of upper and lower power supply chips 8. Each power supply chip 8
A web feeder tip 8a abutting on an area within 10 mm from the outer surface end of the web member 7;
, That is, a flange power supply tip 8b which comes into contact with the center position of the flange member 6 in the width direction. The web power supply chip 8a is supported by the support member 9a, and the flange power supply chip 8b is supported by the support member 9b.

In this embodiment, each of the support members 9a and 9b has an irregular cross-sectional shape as shown in FIG.
And a web feeding tip 8a and a flange feeding tip 8b
Are supported by the distal ends of the support members 9a and 9b, respectively.

Therefore, a power supply trace 10a formed on the web member 7 by contact with the web power supply tip 8a and a power supply trace 10b formed on the flange members 6 by contact with the flange power supply tip 8b, respectively. Are formed very close to the joint between the web material 7 and the flange materials 6 and 6. Note that, unlike the present embodiment, the joint between the web material 7 and the flange materials 6 and 6 and the power supply traces 10a and
10b may be separated by an appropriate distance.

Although not shown, an alternating current is supplied to each of the web feeding chips 8a and the flange feeding chips 8b, and the web material 7 is connected to the web feeding chips 8a and the flange feeding chips 8b. When the alternating current is supplied to the flange members 6, 6, the web member 7 and the flange members 6, 6 are heated.

The other configuration of the first heating device 2 is the same as that of a known heating device, and therefore, further description is omitted. In the present embodiment, the first heating device 2 is configured as described above.

[Welding machine 3] Immediately downstream of the first heating device 2, a welding machine 3 is provided. The welding machine 3 has a pair of upper and lower pressure rolls 11a and 11b.
According to a and 11b, the web member 7 and the flange members 6, 6 whose predetermined positions are heated by the first heating device 2 are continuously joined in an H-shaped cross section.

At the time of this joining, as described above, the power supply trace 1
Both 0a and 10b are formed at positions very close to the joint 12 between the web material 7 and the flange materials 6 and 6. Since the welding machine 3 of the present embodiment is the same as a known welding machine, further description is omitted.

In the present embodiment, the welding machine 3 is configured as described above. [Second Heating Apparatus 4] FIG.
It is B sectional drawing. As shown in FIGS. 3A and 3B and further, FIG. 5, a second heating device 4 is disposed on the exit side of the welding machine 3.

The second heating device 4 includes a pair of left and right induction heating coils 14a disposed near the power supply trace 10a, a pair of left and right induction heating coils 14b disposed near the power supply trace 10b, and a pair of left and right induction heating coils. Induction heating power supplies 15, 15 for supplying high-frequency current to the induction heating coils 14a, 14b, a holder 16a for holding a pair of left and right induction heating coils 14a,
16a, holders 16b and 16b for holding a pair of left and right induction heating coils 14b, and a pair of right and left holders 16a and 1b.
A pair of left and right hydraulic cylinders 17a, 1
7b, a pair of left and right upright stands 18a supporting a pair of left and right holders 16a and a liquid pressure cylinder 17a, and an upright stand 18b supporting a pair of left and right holders 16b and a liquid pressure cylinder 17b. Holder 16a
The holder 16b is slidably supported on the upright stand 18a so as to be able to move up and down, and the holder 16b is slidably supported on the upright stand 18b so as to be able to move up and down.

In this manner, the height position adjusting mechanism 19a of the induction heating coil 14a is constituted by the pair of right and left upright stands 18a, the holder 16a and the liquid pressure cylinder 17a.
b and the hydraulic cylinder 17b constitute a height position adjusting mechanism 19b of the induction heating coil 14b. In the present embodiment, the liquid pressure cylinder 17a is
a ', while the hydraulic cylinder 17b is connected to a hydraulic pressure generator 17b'.

Unlike the present embodiment, as shown in FIG. 6, left and right screws are provided at the upper and lower ends of the upright stands 18a and 18b, and the holders 20a and 20b are provided.
A height position adjusting mechanism is formed by engraving a female screw corresponding to each screw on the inner surface.
The gas burners 21a and 21b may be installed at 0b to perform heating. In this case, the lower holder 2
0b may be fixed and only the upper holder 20a may be movable. Further, unlike the present embodiment, the height position adjusting mechanism may be configured by appropriately combining and using a conventional rack-pinion mechanism, a link mechanism, and the like.

In the present embodiment, the height adjusting mechanisms 19a and 19b are appropriately operated in accordance with the dimensions of the welded H-shaped steel 13, so that the induction heating coil 14a held by the holder 16a and the holder 16b are used. Each of the held induction heating coils 14b can be adjusted to an appropriate height. For this reason, the induction heating coils 14a, 14
With b, both the power supply traces 10a and 10b of the welded H-section steel 13 and the joint 13 can be reliably heated to a predetermined temperature.

In the present embodiment, the second heating device 4 is configured as described above. [Zinc spraying apparatus 5] FIG. 7 is a sectional view taken along the line CC in FIG.
It is sectional drawing. As shown in FIGS. 7 and 3, a zinc spraying device 5 is provided at a position downstream of the second heating device 4 and within 3 m of the outlet side of the welding machine 3.

The zinc spraying device 5 includes a pair of left and right spraying guns 2.
2a, 22b (the spraying gun on the left side of the web 7 is not shown in FIG. 7), and zinc wire feeders 23a, 23b for supplying zinc wires to the spraying guns 22a, 22b.
A thermal power supply 24, a holder 25a for holding the thermal spray gun 22a, a holder 25b for retaining the thermal spray gun 22b,
Liquid pressure cylinder 26 for raising and lowering holders 25a, 25b
a, 26b, holders 25a, 25b, hydraulic cylinder 2
Liquid pressure generating device 2 connected to an upright stand 27 supporting fluid 6a, 26b and fluid pressure cylinders 26a, 26b
8 is provided.

As described above, the spraying gun 22a is attached to the holder 2
The spraying gun 22b is supported by a liquid pressure cylinder 26b via a holder 25b so as to be able to move up and down by a liquid pressure cylinder 26a via a holder 5b. For this reason, by operating the liquid pressure cylinders 26a and 26b, the spraying directions of the spray guns 22a and 22b can be surely matched with the directions of the joints between the flanges 6 and 6 and the web 7, Thereby, the welded H-section steel 13
Can be sprayed on the power supply traces 10a and 10b and the joint portion 12. Note that FIG. 7 also shows the power supply traces 10a and 10b when the distance between the web material 7 and the joining portion of the flange materials 6 and 6 is an appropriate distance.

As described above, the zinc spraying apparatus 5 sprays zinc on the power supply traces 10a and 10b of the welded H-section steel 13 and the joint portion 12 to form a zinc sprayed coating. Therefore, according to the apparatus 1 of the present embodiment, the power supply traces 10 a and 10 b formed on the surfaces of the two flange members 6 and the one web member 7 by the first heating device 2 are separated by two sheets. It is formed close to the joint 12 between the flange material 6 and one web material 7, and the two flange materials 6 are formed by the welding machine 3.
And one web material 7 are joined by welding, and then the power supply traces 10a and 10b of the welded H-section steel 13 and the joint 12
A temperature suitable for thermal spraying by the second heating device 4,
That is, after heating to a temperature at which the adhesion of zinc can be ensured by zinc spraying, the power supply traces 10a and 10b formed on the surfaces of the two flange materials 6 and the one web material 7 by the zinc spraying device 5 By performing zinc spraying on the joint portion 12 of the two flange members 6 and the one web member 7, repair can be performed.

For this reason, according to this embodiment, the adhesion of zinc at the portion where the sprayed coating of zinc is formed is extremely high.
For example, even if contact occurs during transportation of the product, peeling of the sprayed coating of zinc does not occur. As described above, according to the present embodiment, a repair is performed by forming a sprayed zinc coating on the contact portion between the power supply tip and the joint between the two flange members 6 and the web member 7 during welding. The adhesion of the coating can be sufficiently ensured, and the rust prevention performance inherent in hot-dip galvanizing can be sufficiently exhibited for a long period of time.

[0039]

[Examples] For a plating stripped portion of a molten zinc-5% aluminum alloy plated welded H-section steel (80H × 80B × 2.3 / 2.3T), a conventional method (a method of repairing a plated stripped portion by painting) and Repair was performed by applying the method of the present invention, and the condition of the repaired portion was examined.

As a result, in the case of repairing by the conventional method, 1 to 5 zinc peelings occurred in the zinc-coated portion having a length of 0.01 to 0.02 m per 1 m in the longitudinal direction of the joint. But,
In the present invention, no zinc peeling occurred.

(Modification) In the description of the embodiment and the examples, the peeled portion of the hot-dip galvanized film due to welding occurs at both the contact portion with the power supply tip and the joint portion between the web and the flange. The case where a thermal spray coating of zinc was formed on both of them was taken as an example. However, the present invention is not limited to this mode, and is similarly applied to a case where a thermal spray coating is formed on one of a contact portion with a power supply chip and a joint portion between a web and a flange.

In the description of the embodiments and examples,
The case where the power supply tip abuts on the two flange materials and the web material, respectively, is taken as an example. However, the present invention is not limited to this mode, and is similarly applied to a case where the power supply tip contacts one of the two flange members and the web member.

Further, in the description of the embodiments and examples, the case of forming a sprayed zinc coating is taken as an example. However, except for the case where the hot-dip metal-welded H-section steel has a flange material and a web material made of a hot-dip galvanized steel strip or a hot-dip zinc-5% aluminum alloy-plated steel strip, the hot-dip metal coating is formed. Metal spraying may be performed.

[0044]

According to the present invention, it is possible to provide a technique capable of reliably repairing peeling of a molten metal plating film at a contact portion and a joint portion with a power supply tip at the time of welding. It was possible to provide a molten metal plated welded H-section steel suitable for use as a building structural material of a general house, for example, which can sufficiently exhibit the rust-preventive performance inherent in galvanizing.

The significance of the present invention having such effects is extremely remarkable.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram schematically showing an outline of a manufacturing method according to an embodiment.

FIG. 2 is an explanatory diagram schematically showing an outline of a manufacturing method of the present embodiment.

FIGS. 3A and 3B are explanatory diagrams of an apparatus for carrying out the embodiment, wherein FIG. 3A is a top view and FIG. 3B is a front view.

FIG. 4 is a sectional view taken along line AA in FIG. 3 (b).

FIG. 5 is a sectional view taken along line BB in FIG. 3 (b).

FIG. 6 is an explanatory view showing a modification of the upright stand.

FIG. 7 is a sectional view taken along the line CC in FIG. 3 (b).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Apparatus of embodiment 2 1st heating apparatus 3 Welding machine 4 2nd heating apparatus 5 Zinc spraying apparatus 6 Flange material 7 Web material 22a, 22b Thermal spray gun

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) C23C 4/08 C23C 4/08 4/14 4/14

Claims (3)

[Claims] 1. A molten metal-plated welded H-section steel manufactured by welding two flange members and a web member each made of a steel strip having a molten metal plated coating, wherein the molten metal is formed by the welding. A molten metal-plated welded H-section steel, comprising a sprayed coating of a metal constituting the molten metal-plated film at a part where the plated film is peeled off. 2. The exfoliated portion of the hot-dip metal plating film accompanying the welding includes the two flange members and / or
2. The H-shaped molten metal plating weld according to claim 1, which is at least one of a contact portion with a power supply tip for heating the web material and a joint portion between the two flange materials and the web material. 3. steel. 3. A heating method in which a power supply tip is brought into contact with at least one of two flange members made of a steel strip having a molten metal plating film and a web member and energized, and then welding is performed to perform welding. In producing a metal-plated welded H-shaped steel, a molten metal-plated welded H-section steel is characterized in that a metal constituting the molten metal-plated coating is thermally sprayed on a peeled portion of the molten metal-plated coating accompanying the welding. Manufacturing method.