JP2609405B2 - I-type steel production equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for manufacturing an I-type steel material which is used as a steel frame of a building, a bridge or the like by welding a flange material to a side edge of a web material.

[0002]

2. Description of the Related Art Conventionally, various methods have been proposed for forming an appropriate welded portion in the automatic assembling and manufacturing of such an I-type steel material.

For example, Japanese Patent Publication No. 53-936 discloses that
A copying method is disclosed in which a joining point of a flange material abutting on a side edge of a web material is simultaneously welded from above and below.

In Japanese Patent Publication No. 2-37277,
A device for fixing a welding machine, providing a device for integrally turning a set web material and a flange material together, fixing a welding device, and performing automatic welding while moving a set I-shaped steel material is described. ing.

[0005] Further, Japanese Utility Model Application No.
Japanese Patent Application Publication No. 89709 discloses a copying mechanism of an automatic welding apparatus applied to a method of manufacturing an I-type steel material in which a web material is maintained vertically and flange materials are disposed at upper and lower edges.

[0006] These automation measures involve welding while moving the web material, and the equipment itself becomes large-scale, and there has been a problem that it takes time to adjust the position at the time of welding.

On the other hand, there is an automatic assembling apparatus for I-type steel materials in Japanese Patent Application No. 3-195561 previously filed by the present applicant.

In this assembling apparatus, the web material constituting the I-shaped steel material is held in a horizontal position, and the flange material is vertically rotated from the horizontal position and abuts against both edges of the web material, so that the joining surface is horizontal. The contact portion between the located web material and the flange material is temporarily welded by welding from the lower surface, and then the fillet welding is performed from above while keeping the web material in a horizontal position.

This makes it possible to set a flange material in a state where a heavy web material is fixed in a horizontal position and to perform welding by a relatively simple copying mechanism, which is a very promising method for automation.

[0010]

As described above, the manufacture of I-beams for bridges requires a large girder height (web width), so that the mechanized equipment is large-scale and the range of the girder height is small. It is less than 1 m in size and up to about 3 m in size, and it is a very complicated facility to mechanize all of these productions.

It is an object of the present invention to provide an apparatus which can make the equipment as simple as possible and which can produce highly efficient and high quality products.

[0012]

According to the present invention, there is provided an apparatus for manufacturing an I-type steel material, comprising: a conveyor gantry comprising a transport roller gantry and a driven roller gantry arranged in parallel, on which a web material is placed in a horizontal position; An assembling apparatus in which a flange material holding frame vertically arranged to be constrained to both side edges of the web material and an automatic welding machine for temporarily attaching the flange material from the lower side of the web material upward by horizontal fillet, A horizontal fillet welding device for welding the joint between the web material and the flange material, a device for reversing the upper and lower surfaces of the web material of the I-shaped steel material assembled and welded, and a flatness correction device for the flange material assembled and welded. And each device is penetrated by a conveyor line.

[0013] The horizontal fillet welding apparatus in the above-mentioned manufacturing apparatus uses a small-diameter electrode wire to weld a web material arranged on a conveyor in a horizontal position and flange materials on both sides of the web material. A tandem submerged arc welding apparatus using the trailing electrode as an AC power source can be provided.

Further, the flatness correcting device in the above-mentioned manufacturing apparatus is a laterally-pressed press system incorporated in a C-shaped frame, and the C-shaped frame is placed on a carriage movable in a direction perpendicular to the conveyor line. Is installed so as to enclose the flange material from the outside, and transports the assembled and welded I-type steel material while holding the web material in a horizontal position on a conveyor, and stops after the flange material reaches the C-type frame. The operation and the transport operation by the conveyor may be synchronized and alternately operated, and the cart may be free to move during the straightening operation.

[0015]

According to the present invention, the function of the conveyor line is utilized to the fullest extent. The web material is placed on the conveyor, the flange material is set and restrained, the temporary welding is performed from the lower side of the web material, and the restraint is performed. After the release, the conveyor is operated to supply the work to the welding machine. The welding machine may be a movable work type or a self-propelled type. The work does not need to be restricted as long as the web material is placed on the conveyor. After the main welding of the surface, the work is moved by the conveyor to just below the reversing machine,
The web surface is turned upside down and sent back to the welding machine by a conveyor. In addition, the work after the main welding on the back side is directly sent to the straightening machine by the conveyor, and while being conveyed by the conveyor, the flange material, which is called the breakage of the flange material, is inclined around the joint with the web material. Can be corrected to a flat state.

As described above, the conveyor from the assembling apparatus to the straightening machine holds only the lower surface of the web material to perform all processes. The roller system is most easily designed and economically advantageous for this conveyor.

In the present invention, the web material of the work is placed horizontally on the conveyor gantry by a crane, and the flange material is pressed against the end face of the web from the side in a vertical state, and is assembled with restraining. In this case, in order to mechanize the tack welding from the upper surface of the web, a complicated mechanical device must be provided above the work, and even if it is provided, it is difficult to carry in the work and engineering is difficult.
Conversely, if the tack welding is performed from the lower side of the web, the equipment can be easily designed so as not to hinder the loading and setting of the work. In addition, with the recent progress in welding technology, a welding method suitable for upward horizontal fillet welding has emerged. This upward horizontal fillet welding means welding in a posture in which normal horizontal fillet welding is turned upside down with reference to the lower plate.

More advantageously, the main welding in the next step is, of course, performed from the upper surface of the web, and has the advantage that the directions of the respective welding strains are reversed and cancelled. In the reversing process of the work after the final welding, the joint between the web and the flange was also welded on both sides. Can be done.

The main welding was tandem submerged arc welding using a small diameter wire.

The advantage of this is that when the web of the bridge is fully welded with the web in a horizontal position, if the thickness of the web material is relatively thin, about 10 mm, the use of a large-diameter electrode wire will melt the web. In contrast, the weld metal is burnt off, whereas the case of a thin wire is not. The reason for this is that in the case of a large-diameter wire, the arc-generating portion of the leading electrode becomes the root (web end) of the joint where the fillet is welded, and the end of the web is directly heated, and Since a high current must be used for the diameter electrode, the end of the web is excessively heated to cause burn-through. On the other hand, in the case of a small-diameter wire, the arc generating point of the leading electrode is 3 to 4 mm wide from the end of the web at the root of the web (middle side from the end of the web), and the end of the web is not directly heated. Since a low current is inevitably used, burn-through of the web hardly occurs. Furthermore, if the electrode spacing is kept relatively large (about 40 mm or more) by a relatively low current,
Two-pool welding (the welding molten pool of the leading electrode and the trailing electrode is separated) and an arc is generated in the welding metal of the leading electrode even when the direction of the arc of the trailing electrode is toward the root portion. It does not occur. Here, the small-diameter electrode wire is 2.4 mmφ or less and 2.4 mmφ.
If it is too large, the above effects cannot be obtained. Further, the reason that the above effect can be obtained by using a small-diameter electrode wire is that the melting heat efficiency of the electrode wire is improved, the amount of deposited metal increases even when the same welding current is used, and the base material is heated and melted. This is because the amount of heat decreases.

In general, an AC power source is used for the welding power source, but it is preferable that the preceding electrode uses a DC power source and has a negative polarity. The reason for this is that the melting efficiency of the electrode wire can be further enhanced by the minus electrode, and the penetration depth of the preceding electrode can be reduced.

Here, it is possible to use a small-diameter electrode wire.
It is easy to apply a DC power supply. This is because a small diameter wire is fed at a high speed as in carbon dioxide arc welding, so that feeding at a constant speed can enable stable welding as a natural phenomenon.

Here, the extent to which the amount of melting of the electrode wire differs depending on the wire diameter and the type of power supply will be described by way of example. When the welding current is 400 A with an AC power supply, the wire diameter per unit time of 3.2 mmφ per unit time is described. Assuming that the melting amount is 1,
The wire diameter is about 1.5 at 2.4 mmφ, about 2.0 at 2.0 mmφ, and about 3 at 1.6 mmφ.
If the wire diameter is 2.0 mmφ or less compared to mmφ, 2
More than twice the amount of melting. Then, the amount of melting of the base material is reduced by that amount.

Further, at the same welding current of 400 A, 2.0 mm
Assuming that the amount of melting in the case of the AC power source of φ is 1, the electrode wire minus of the DC power source is approximately 1.2, and the above effect is exhibited accordingly.

As described above, the submerged arc welding method using the electrode of the small diameter wire prevents the base material from being burnt out. However, since the heat input to the base material is small, the welding distortion of the workpiece is also small. In the case of temporary welding of only one side as in the present invention, the main welding can be performed without any constraint only by arranging the web of the work on the conveyor.

Further, by using tandem submerged arc welding of a DC and AC power supply using a small diameter wire, horizontal fillet welding up to a leg length of 10 mm can be performed with almost equal leg length in one pass. This is also an effect of using direct current for the small-diameter electrode wire and the leading electrode.

[0027] Further, since a thin electrode wire is used in equipment, a coil pack (packed wire or pail) having a capacity of several hundred kg wound horizontally like a carbon dioxide arc welding machine or the like is used. (Referred to as a pack), and can be connected with a conduit tube even if it is installed far from the wire feeder, so that compact equipment can be provided. In addition, an inverter type DC power supply can be used as the welding power supply, and the AC power supply is also for the trailing electrode, so a small capacity is sufficient, and a commercially available thyristor type is sufficient. It is convenient to add various software such as presetting, reading, and sequencing of welding conditions.

In the case where it is not necessary to reverse and feed the web surface after the main welding, the main welding machine for the back surface may be additionally installed. In this case, the welding machine is not necessarily required to use the small-diameter electrode wire. It does not need to be the welding machine used. This is because the main welding of the surface has been completed, so that there is no occurrence of welding burn-through at the end of the web or large welding distortion.

Further, in this case, the straightening machine can correct the welding distortion of the flanges on both sides without reversing the work. This is also possible by the inching of the workpiece by the conveyor and the pressing of the side, so that the pressing machine is a pair of facilities facing right and left. If this correction is to be performed by a roll method, a driving device for moving the work via the correction roll is required, and complicated and large-scale equipment such as synchronizing the peripheral speeds of the right and left correction rolls cannot be obtained. Not get.

If this is a side-pressing press system, there is no need for a drive device for the work, so that the equipment can be easily installed. That is, a pressing die having a length of about 1 m in the length direction of the work is horizontally arranged in the center of the C-shaped frame together with the hydraulic cylinder in the C-shaped frame, and the same length is provided above and below the tip of the C-shaped frame. If a pair of receiving dies are provided, the web material of the work is passed through the cut of the C-shaped frame, so that the frame is shaped to embrace the flange, the pressing die is operated, and the flange is pressed. This makes it possible to correct bulkiness. In this case, the work is stopped during the press, and when the mold is released after the press, the work is moved in the length direction by an appropriate amount by the conveyor, and the operation of this press and the synchronous operation of the drive of the conveyor are repeated to repeat the operation. Thus, it is possible to correct the entire length of the work. It is also easy to electrically automate this synchronization.

Further, the advantage of this press method is that since a straightening force can be applied to a wide area over a length of about 1 m of the work, the work is not flawed.

As described above, according to the present invention, the advantage of performing the assembly, welding, and straightening in the production of the I-type steel material in a state where the web material is placed on the conveyor and maintained in a horizontal state can be maximized.

[0033]

FIG. 1 is a schematic perspective view of an apparatus line for manufacturing an I-shaped steel material for carrying out the present invention.

In FIG. 1, reference numeral 1 denotes a set member of an I-type steel material in which a flange material is vertically sandwiched between both end edges of a web material held stationary in a horizontal posture, and the web material of the set material is held stationary in a horizontal posture. FIG. 2 shows an assembling device for temporarily welding the contact portions of the side edges of the web material with the flange material from below the web material in a state. 2 is a method of transferring an I-type steel material in which a flange material is temporarily welded to a web material in the assembling apparatus 1 and holding the web material in a horizontal posture and holding the web material at both edges of the web material and the flange material. 1 shows a main welding device for fillet welding a contact portion from above. Reference numeral 3 denotes a reversing device for reversing an I-type steel material in which the upper surface side of the contact portion between the web material and the flange material is fillet welded to make the back surface an upper surface. 4 more
Shows a straightening device for straightening a welded bulk of a flange material. Reference numeral 5 denotes a conveyor line for transporting an I-type steel material.

In the material set for assembling shown in FIG. 2, the web material W is placed in a horizontal position on the roller mount 501 by a crane while maintaining the horizontal position, and is disposed on the side thereof. The flange material F is placed on the flange material holding frames 7 and 8 while maintaining the horizontal posture.

In FIG. 3, a flange centering roller 9 which is disposed on each of the flange holding frames 7 and 8 so as to be movable to the left and right in the width direction of the flange F is restrained so as to match the assembly dimensions. It is supported by an umbrella-shaped roller 90 to prevent it from falling, and its center position is
To the side edge of

Next, in the tack welding of the I-shaped assembly material shown in FIG. 3, one movable flange material holding frame 7 and a fixed frame which are constructed so as to be movable in the width direction of the web material W by the carriage 10 are provided. The other movable flange holding frame 8 configured on 11 rotates the flange material F placed and held on each of the frames to a vertical position at 90 ° by the operation of the electric jack device 12, A bogie 10 corresponding to the width of one web material W with the web F as the center of the web material W
After pressing against both side edges of the web W by the movement of
The welding torch 13 arranged upward in the direction of approximately 45 ° from below is moved from below along the joint between the flange member F and the web member W to perform automatic tack welding. The welding method is mag pulse arc welding. In addition, the code | symbol 42 in FIG. 3 shows the drive motor of each part, and 43 shows an air cylinder.

FIG. 4 shows an embodiment of automatic tack welding.

In the same figure, reference numeral 14 denotes a welding torch adjusting section fixed to the base of the welding torch 13. A web material sensor 15 and a flange material sensor 16 are integrally attached to the welding torch adjusting unit 14, and the web material W and the flange material W at the respective ends of the web material sensor 15 and the flange material sensor 16 are attached. By the contact of the material F with the respective surfaces, the electrode wire of the welding torch 13 is electrically spot welded so as to accurately hit the contact corner between the web material W and the flange material F.

In the drawing, reference numeral 17 denotes a bogie equipped with an automatic welding device;
Is a roller for fine adjustment of the assembling apparatus, which accurately sets the position of the web material W before starting the tack welding. Reference numeral 19 denotes an upper roller on the receiving side of the fine adjustment roller 18, reference numeral 20 denotes an upper carriage that supports the upper roller 19, and runs in synchronism with the automatic welding apparatus mounting carriage 17, and reference numeral 21 denotes a traveling rail for the respective carriages 17, 20. is there. Reference numeral 22 denotes a servomotor, 180 denotes an air cylinder, 190 denotes an adjustment handle, and arrows indicate welding directions.

As described above, the tack welding is performed from the lower surface of the horizontally arranged web material, so that the welding device does not come out to the upper surface on the equipment, and there is no obstacle to the loading of the work. Further, the deformation due to the main welding from the upper side of the next step is offset, and the welding distortion can be reduced.

Next, as shown in FIG. 5, the I-type steel set material S comprising the two flange materials F temporarily welded to the web material W proceeds to the main welding, and adjusts the interval of the conveyor line 5 as it is. The beam 2 parallel to the width direction of the web material W is transferred onto the driven conveyor roller 51 and the idle conveyor roller 52, and the web material W is held stationary in a horizontal posture.
6, a set of welding devices 27 capable of adjusting the mutual distance,
27, the contact corner between the web W material and the flange F material is submerged arc from above the tack-welded I-type steel material S by the horizontal fillet welding device 2 moving on the traveling rail 200. Welded. The drive conveyor roller 51 of the conveyor line 5 is rotated by the drive motor 23,
The floating conveyor roller 52 includes a drive motor 24 that moves a roller base 520 that moves in the width direction of the web material W according to the width of the web material W.

As shown in the figure, the horizontal fillet welding apparatus 27, 27, which is the main welding, employs a submerged arc welding, in which a leading electrode using a negative electrode using a DC power supply and a succeeding electrode using an AC power supply are connected. Is adopted and a method of maintaining a distance between the electrodes of 40 mm or more is adopted, thereby enabling a two-pool welding.

As the electrode wires, 1.6 to
By using a 2.4 mmφ thin electrode wire, shifting the leading electrode to the web side, performing primary welding while reducing the amount of melting of the base material, and then performing welding with a relatively small current AC electrode. Horizontal fillet welding can be performed while preventing meltdown of the molten metal. By employing the combination of the DC electrode and the AC electrode, the entire equipment can be reduced in weight and size. In the figure, reference numeral 29 denotes an inverter type DC power supply having a capacity of 600 A, reference numeral 30 denotes a thyristor type AC power supply having a capacity of 500 A, and reference numeral 31 denotes a wire pack, and a welding tube 27 is supplied to the welding devices 27 and 27 by a conduit tube 32. Reference numeral 33 denotes a wire coil for a trailing electrode, reference numeral 34 denotes a flux hopper, and reference numeral 45 denotes a motor for driving in the width direction.

In the case of the present apparatus, when the temporary welding is performed only from the lower surface of the web in the horizontal composition mode, when the restraint of the members at the time of assembly is released, the flange material tends to slightly fall on the welded side, and the lower side of the web is Thus, the phenomenon that both flange members are closed and the upper side tends to open at the upper side, and the upper side of the welded joint tends to open at the time of the first neck welding can be brought into close contact by the main welding from above.

As described above, the workpiece S having the horizontal fillet welded on the front surface side of the web material is conveyed to the reversing device 3 by the conveyor line 5 and turned over so that the back surface of the web material W is set to the upper surface side. Then, it is sent back to the horizontal fillet welding apparatus 2 by the conveyor line 5 and is subjected to main welding in the same manner as described above, thereby completing the I-shaped steel material by welding. The reversing device 3 may be a method of lifting and rotating the work S, and is a known portal-type device.

Next, the assembled and welded I-shaped steel S is transported to the straightening device 4 arranged on one side of the conveyor line 5 to correct flatness.

As shown in FIG. 6, the straightening device 4 includes a horizontal laterally pushing piston (hereinafter, referred to as a hydraulic cylinder) 36 provided in a C-shaped frame 35 and a pressing die for a flange material F provided at the end thereof. 37, and a hydraulic press having a pair of upper and lower receiving dies 38 disposed at the front end facing portions of the C-shaped frame 35.

The C-shaped frame 35 is supported on a carriage 40 that moves on a rail 39, and the push fitting 37 is connected to a flange material F
A drive motor 41 is provided on the carriage 40 so as to face the side surface of the carriage 40 and move in accordance with the position.

The carriage 4 is moved to a position where the front end surface of the flange material F can pass through the front opening surface of the C-shaped frame 35 of the straightening device 4.
Move 0, stop and wait. When the front end surface of the flange material F of the work S activates a limit switch (not shown) provided on the rear surface of the C-shaped frame 35, the bogie 4
The brake (not shown) provided on the drive shaft or the brake for the drive motor 41 is released, and the carriage 40 is in a free state.

When the limit switch (not shown) provided on the front portion of the C-shaped frame 35 is actuated by the front end surface of the flange material F being continuously conveyed, the drive conveyor roller 51
Is stopped, the work S on the conveyor line 5 is held stationary, and the hydraulic cylinder 36 is operated with a slight delay, the pressing die 37 advances, and the receiving die 3
When the required pressure is reached by sandwiching and pressurizing the flange material F in a crooked state between the first and second flanges 8 and 38, the operating valve (not shown) of the hydraulic cylinder 36 is switched, and the pressing die 37 moves backward, Complete the correction.

When the pressing die 37 returns to the initial position, the driving motor 23 is operated to convey a required length of the work S and stop.

Next, the correction operation is repeated to complete the correction of the entire length of the flange material F, and a limit switch (not shown) whose rear end surface of the flange material F is provided on the front surface of the C-shaped frame 35 is operated. Then, the braking brake or the clutch (not shown) of the drive motor 41 is restored, the moving operation of the carriage 40 becomes possible, and the work S returns to the standby position after passing through the rear end portion thereof.

As described above, the timing of the transfer of the work S on the conveyor line 5 and the timing of the pressing of the hydraulic press are controlled synchronously and performed automatically. However, the synchronization control can also be performed manually.

Next, the workpiece S is fed backward by the conveyor line 5, and after being inverted by the reversing device 3, the other side of the flange material F is straightened by the same straightening operation as described above. Note that the reaction force at the time of correction is not applied to the conveyor line 5 because the carriage 40 is in a free state,
Can prevent the excessive force from being applied to the conveyor line 5.

Further, in order to prevent the work S from moving during the straightening operation, it is preferable that the conveyor line 5 is formed by rollers coated with rubber over several lines before and after the straightening device 4. This is because, by increasing the frictional resistance with the work S, the transfer and the stop of the work are more reliably performed, and the work S is cambered (warped in the horizontal direction) so that the work S can be moved to one of the metal parts of the hydraulic press machine. Type 37,
38, the carriage 40 moves more reliably in the left and right directions, follows the camber to facilitate transportation and correction, and furthermore, moves the work S by the above-described reaction force (on the conveyor line 5). This is to prevent slippage and to prevent the occurrence of flaws due to the slippage.

Further, in the structure of the present invention, after the correction of the flange material F on one side is completed, the material is reversely fed, reversed, and then fed forward to correct the flange material F on the other side. By installing two straightening devices 4 on both sides of F opposite to each other, the steps of reverse feeding, reversing, and sequential feeding can be made unnecessary.

[0058]

According to the present invention, the following effects can be obtained.

(1) While the web material is stationary in a horizontal position, tack welding is performed only from below, main welding is performed from above and straightening is performed by a horizontal pressing method. Manufacturing apparatus.

(2) For the manufactured I-type steel material, tack welding is performed on the lower side (backside corner), main welding is performed on the upper side (surface corner), and then the reverse is performed on the rear side in the order of upper side. As a result of performing the correction by the horizontal pressing method in a free state, it is possible to obtain high quality without flaws.

(3) A highly efficient production facility can be provided.

(4) By employing a tandem submerged arc welding machine using a small-diameter electrode wire, not only is the effect of preventing burn-through of the web, but also the application of a DC power supply is facilitated, and the effect is increased. .

(5) Further, due to the stability of the arc by the DC power supply and the increase in the amount of wire welding, the possible leg length in one-pass welding increases, and the bead appearance improves.

(6) Further, by using a DC power supply for the leading electrode using a relatively large welding current, it becomes easy to make the equipment compact and automatically sequence.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of an apparatus row for manufacturing an I-shaped steel material for carrying out the present invention. .

FIG. 2 is a process showing an arrangement of a web material and a flange material for assembling an I-shaped steel material.

FIG. 3 shows a state of clamping of a flange material.

FIG. 4 shows a state of tack welding between a web material and a flange material.

FIG. 5 shows a state of horizontal fillet welding by main welding.

FIG. 6 shows an operation mode of the straightening machine.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 Assembly device 2 Welding device 3 Reversing device 4 Straightening device 5 Conveyor line 7, 8 Flange material holding frame 9 Flange centering roller 10 Cart 11 Fixed frame 12 Electric jack device 13 Welding torch 14 Welding torch adjustment unit 15 Web material sensor 16 Sensor for flange material 17 Cart with automatic welding device 18 Roller for fine adjustment of assembly position 19 Receiving upper roller 20 Upper cart 21 Rail for running 22 Servo motor 23, 24 Motor for driving 26 Beam 27 Horizontal fillet welding device 29 DC power supply REFERENCE SIGNS LIST 30 AC power supply 31 Wire pack 32 Conduit tube 33 Wire coil 34 Flux hopper 35 C-shaped frame 36 Horizontal horizontal push piston 37 Push mold 38 Receiving mold 39 Rail 40 Truck

Continued on the front page (51) Int.Cl. ⁶ Identification number Office reference number FI Technical display location B23K 37/00 B23K 37/00 F 37/04 37/04 L (72) Inventor Tomoaki Mihara Wakamatsu, Kitakyushu, Fukuoka Prefecture 1-138-406, Fushima-ku, Tokyo (72) Inventor Kotaro Kakimoto 5-9-1 Nishihashimoto, Sagamihara-shi, Kanagawa Prefecture Nippon Steel Corporation Steel Structure Marine Division (72) Inventor Koji Soejima Sagamihara, Kanagawa Prefecture 5-9-1 Nishihashimoto, Nippon Steel Corporation Steel Structure Marine Division (56) References JP-A-63-126680 (JP, A)

Claims (3)

(57) [Claims] 1. A conveyor gantry comprising a transport roller gantry and a driven roller gantry arranged in parallel, on which a web material is placed in a horizontal posture, and opposed flanges for restraining the flange material almost vertically to both side edges of the web material. An assembling apparatus including a material gripping pedestal, an automatic welding machine for tacking the flange material upward from the lower side of the web material with a horizontal fillet, and a horizontal corner for welding a joining corner between the web material and the flange material It has a meat welding device, a device for reversing the upper and lower surfaces of a web material of I-type steel material assembled and welded, and a device for correcting flatness of a flange material assembled and welded. Manufacturing equipment for mold steel. 2. The apparatus for manufacturing an I-type steel material according to claim 1, wherein said horizontal fillet welding apparatus reduces the welding between the web material arranged on the conveyor in a horizontal posture and the flange materials on both sides thereof. Using an electrode wire, the leading electrode is a DC power supply,
An apparatus for manufacturing an I-type steel material, which is a tandem submerged arc welding apparatus using a trailing electrode as an AC power supply. 3. The apparatus for manufacturing an I-shaped steel material according to claim 1, wherein said flatness correction device is a laterally-pressed press system incorporated in a C-shaped frame, and said C-shaped frame is in a direction perpendicular to a conveyor line. The C-shaped frame is installed on the trolley that can be moved to the outside so that the flange material is surrounded from the outside, and the assembled and welded I-type steel material is transported while holding the web material in a horizontal position on the conveyor, and the flange material is C-shaped. An apparatus for manufacturing an I-shaped steel material which is stopped after reaching the inside of the mold frame, synchronizes the pressing operation and the conveying operation by the conveyor, alternately operates, and allows the carriage to move freely during the straightening operation.