JP2011016143A - Method and apparatus for manufacturing welded wide flange shape - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing, by which lightweight wide flange beams are manufactured while surely detecting surface flaws.SOLUTION: This method is a method for manufacturing the wide flange, which includes a first-fourth steps when manufacturing the welded wide flange beams having a desired length by welding and cutting long size web materials and long size flange materials after combining them into a H-shaped cross section. In a first step, the cross sectional shapes in the respective width directions of the web materials and the flange materials are measured about the longitudinal direction by a light-section method using slit laser beams and the respective three dimensional shapes of the web materials and the flange materials are determined. In a second step, the positions of the respective defective regions of the web materials and the flange materials are specified on the basis of the determined three-dimensional shapes. In a third step, the specified defective regions are marked after performing the welding of the web materials and the flange materials. In a fourth step, the marked defective regions are cut down with a cutter.

Description

  The present invention relates to a method and an apparatus for manufacturing a welded H-shaped steel, and more specifically, a web after combining a long web material and a flange material discharged from a hot-rolled coil into a cross-sectional H shape. Assembling a long welded H-section steel by welding a steel material and a flange material, and cutting the long welded H-section steel with a cutting machine, a welded H-section steel having a desired length is produced. The present invention relates to a method and an apparatus for manufacturing while reliably detecting surface defects. The present invention is particularly suitably used for the production of welded lightweight H-section steel frequently used for building materials.

  FIG. 4 is an explanatory view schematically showing an example of a manufacturing process of a normal welded light-weight H-section steel 2, and FIG. 5 is a concept in which the vicinity of the welding machine 10 in the manufacturing apparatus 1 shown in FIG. 4 is extracted and enlarged. FIG.

  As illustrated in FIGS. 4 and 5, the welded H-section steel 2 is composed of a long web material 5 and a flange material 6 composed of hot rolled coils 4, 4, 4, which are delivered by payoff reels 3, 3, 3. , 6 is corrected by the levelers 7, 7, 7, and then fed by the web upsetter 8 in the vertical conveyance posture and the web material 5, 6 is fed in the horizontal conveyance posture. Are rapidly heated and heated by the high-frequency heating devices 9 and 9 and then combined into a H-shaped cross section, and the web material 5 and the flange materials 6 and 6 at a position 10c by a welding machine 10 having a pair of pressure rolls 10a and 10b. Are joined to form a long welded H-section steel 2.

  Thereafter, the long welded H-section steel 2 is subjected to cutting of the weld bead by the weld bead forming device 11, cooling by the cooling device 12, and correction by the correction device 13 having the correction roll 13a. By cutting to a desired length, the welded H-section steel having the desired length is obtained. In addition, the code | symbol 14 in FIG. 4 shows the coil joint welding machine for joining the hot rolling coil 4 which makes the web material 5 and the flange materials 6 and 6 one by one.

  Welded H-section steel manufactured in this way, especially for welded light-weight H-section steel with web thickness of 2.3 to 6.0 mm and flange thickness of 2.3 to 12.0 mm used for building materials Therefore, the web and the flange are each required to have a beautiful appearance with no minute wrinkles (surface defects). However, in the welded H-shaped steel, wrinkles may be generated in the hot rolling process in the web material and the flange material itself, or wrinkles may be generated in the manufacturing process shown in FIGS. Inventions for detecting flaws in the manufacturing process of welded lightweight H-section steel have been proposed so far.

  For example, Patent Literature 1 and Patent Literature 2 disclose an on-line ultrasonic inspection of a long welded H-shaped steel web and flange butt weld after completion of welding of the web material and the flange material. . As described above, in the manufacture of welded H-section steel, generally, surface inspection by visual inspection has been performed in a downstream refining process. The reason why surface inspection has been performed in the refining process is that the surface inspection is performed immediately before product shipment, so that it is possible to make a shipment judgment, that is, the emphasis was placed on quality assurance of the final product, and web and flange welding. This is because surface defects and the like newly generated in the welded H-section steel can be detected in a subsequent transport process or the like.

  However, in the surface inspection of long welded H-section steel, it is necessary to inspect for surface defects in two places, two on the outer surface of the flange, four on the inner surface of the flange, and two on the upper and lower surfaces of the web. Then, it was virtually impossible to inspect the entire length of the long welded H-shaped steel for the presence of surface defects. In order to eliminate the inspection omission, it is necessary to increase the number of inspectors or to newly install an inspection device in place of the inspectors. In any case, the manufacturing cost of the welded H-section steel cannot be denied.

  Furthermore, even if a surface defect is detected in the product, if the depth of the defect is deep, especially with a welded lightweight H-section steel, the maintenance mark will also be rejected in terms of appearance quality, so that repair by maintenance is not possible. Since it was impossible, it had to be scrapped, and the yield was greatly reduced, which was uneconomical.

  In addition, it takes a lot of labor and time to feed back the cause of the surface defect generated in the welded H-section steel to the upstream processing step that is the cause of the occurrence. Conventionally, when a surface defect is found and pointed out, a defect sample is collected afterwards to elucidate the cause of the surface defect, but from the inspection position to the process that causes the surface defect. It is difficult to identify the cause of surface defects due to the large number of processes, the presence of many lines, and the order of work in progress depending on the processing timing of each line. As such, it was a complicated task. Moreover, the response | compatibility with respect to the generated surface defect becomes slow.

  In particular, it is possible to discriminate between the case where there is a surface defect in the hot rolled coil (steel strip) itself and the surface defect generated in the manufacturing process (assembly / welding process, refining process, transport process) of the welded H-shaped steel. There are many cases where it becomes difficult.

  In addition, from the viewpoint of quality assurance, flaw detection of surface defects in the manufacturing process of hot-rolled steel sheets is considered to be sufficient in the past by conducting a survey from a hot-rolled steel sheet, which is a product. The necessity and advantage of conducting the inspection of the entire surface and the entire surface of the surface defects were not particularly pointed out.

  As a representative inspection method for surface defects of a steel plate, a method using reflected light is widely used. Laser light is projected onto the surface of the steel sheet, the reflected light is photoelectrically converted, the converted output (voltage waveform) or its differential output is compared with a threshold value, and if it is equal to or greater than the threshold value, it is determined that there is a defect. Cold rolled steel sheets and plated steel sheets for automobiles and cans are manufactured through steelmaking processes, hot rolling processes, pickling processes, cold rolling processes, plating processes, etc. It occurs in various processes, from the upper process of the steel and hot rolling to the plating process itself. In particular, in the hot rolling process, a black skin scale exists on the surface layer, so it is difficult to find non-metallic inclusions, and as described above, the occurrence of wrinkles after the hot rolling process results in the cold process and the plating process. Inspection of surface wrinkles is the mainstream, and wrinkle inspection at the black skin scale stage is mainly visual inspection.

  The conventional display means of surface defects (surface defects), for example, affixed information indicating the result of visual inspection to the product, and identified the defect position on the surface of the steel sheet while referring to this information in the downstream process. . However, with this method, it is difficult to detect surface defects efficiently and accurately on the downstream process side, and the position of the surface defects cannot be detected accurately. Therefore, this method is not suitable for sorting non-defective products or defective products. There is a possibility that a product having a defect will be shipped. Further, in the visual inspection in the hot rolling process, simultaneous inspection of the front and back surfaces of the steel sheet is difficult, and the efficiency is poor in terms of personnel and equipment.

  Patent Documents 3 to 5 disclose inventions related to a marking device that makes it possible to easily identify an occurrence portion of a surface defect when the inspection portion is re-inspected.

JP-A-6-194344 JP-A-6-273391 JP-A-4-291138 JP-A-6-714 JP 2000-241358 A

  However, in order to divert the inventions disclosed in Patent Documents 3 to 5 to the manufacturing process of the welded H-shaped steel, the operator visually observes the markings on the long welded H-shaped steel web or flange. It is necessary to confirm. However, unlike steel plates, welded H-section steel has a complicated cross-sectional shape, so there are many blind spots that are difficult to visually confirm and parts that are difficult to visually confirm. Extremely difficult. For this reason, if the invention originally intended for the inspection of surface defects of steel sheets, as disclosed in Patent Documents 3 to 5, is simply diverted to the inspection of surface defects of welded H-section steel, It cannot be reliably tested.

  The present invention has been made in view of the problems of such a conventional technique, and after combining a long web material and a flange material discharged from a hot-rolled coil into an H-shaped cross section while feeding them. A long welded H-section steel is assembled by welding a web material and a flange material, and a welded H-section steel having a desired length is manufactured by cutting the long welded H-section steel with a cutting machine. An object of the present invention is to provide a manufacturing method and a manufacturing apparatus capable of manufacturing while reliably detecting the surface defects, thereby preventing the welded H-section steel having the surface defects from being shipped. In addition, it is easy to take measures (treatment such as care and devaluation) when a surface defect occurs, and to take a quick response to the surface defect.

The present invention provides a long welded H-shape by welding the web material and the flange material after being combined into a H-shaped cross section while feeding the long web material and the flange material discharged from the hot-rolled coil. A method of producing a welded H-section steel having a desired length by assembling steel and cutting a long welded H-section steel with a cutting machine,
First step: After being discharged from the hot-rolled coil and before being combined with the H-shaped cross section, the cross-sectional shape in the width direction of each of the web material and the flange material is obtained by a light cutting method using a slit laser beam. Obtaining a three-dimensional shape of each of the web material and the flange material by measuring the longitudinal direction of each of the web material and the flange material;
2nd process: Specifying the position of each defect part of a web material and a flange material based on the calculated | required three-dimensional shape,
Third step: After the web material and the flange material are welded, the identified defective part is marked, and the fourth step: the marked defective part is cut down by a cutting machine, or a desired length Manufacture of welded H-section steel, comprising determining whether or not shipment of welded H-section steel is possible according to the degree of defect of welded H-section steel including a defective portion Is the method.

  In the method for manufacturing a welded H-section steel according to the present invention, the web material and the flange material are pressed by a pair of rolls before and after measuring the cross-sectional shapes in the width direction of the web material and the flange material in the first step. It is desirable to suppress flapping of the web material and the flange material.

  From another point of view, the present invention provides (i) an uncoiler for feeding out a long web material and a flange material to feed the long web material and the flange material, and (ii) a long web to be fed. A welding machine for assembling a long welded H-shaped steel by welding the web material and the flanged material after combining the material and the flange material into a cross-sectional H shape, and (iii) cutting the long welded H-shaped steel And (iv) a web material and a flange formed by an optical cutting method using a slit laser beam, which is disposed between the uncoiler and the welding machine. A cross-sectional shape in the width direction of each material is measured in the longitudinal direction of each of the web material and the flange material to obtain a three-dimensional shape of each of the web material and the flange material. An apparatus, (v) a marking device arranged between a welding machine and a cutting machine to mark a long H-shaped steel web or flange, and (vi) a three-dimensional shape determined by a wrinkle inspection device Based on the position of the defective part of each of the web material and the flange material based on the output, a command to mark the specified defective part is output to the marking device, and further, a command to cut down the specified defective part is output to the cutting device, or And a control device for outputting a command for conveying the welded H-section steel including a defective portion among the welded H-section steel having a desired length to a defect inspection process. Device.

  The manufacturing apparatus for welded H-section steel according to the present invention is disposed upstream and downstream of a measuring unit that measures cross-sectional shapes in the width direction of the web material and the flange material in the wrinkle inspection device. It is desirable to provide a pair of rolls that suppress the flapping of the web material and the flange material by pressing.

  According to the present invention, it becomes possible to manufacture a welded H-section steel having a desired length while reliably detecting the surface defects, whereby the welded H-section steel having a surface defect is shipped. It is easy to take measures (care, treatment, etc.) when surface defects occur, and it is possible to quickly take measures against surface defects.

  That is, according to the present invention, (a) the surface defects in the web material and the flange material of the welded H-shaped steel before welding are detected by the wrinkle detection device. Compared with the case of detecting by visual inspection or the like, it is possible to remarkably improve the detection accuracy of surface defects, particularly surface defects caused by hot-rolled coils that are materials of web materials and flange materials, and the surface of the welded H-section steel. Since defects can be reliably detected, (b) among surface defects generated in the welded H-section steel, surface defects caused by hot-rolled coils that are materials of the web material and the flange material can be identified. , Can identify surface defects that occur in the manufacturing process of welded H-shaped steel, and deal with surface defects (for example, removal of the cause of surface defects, treatment of surface defects in products, and devaluation treatment) The becomes possible to promptly take, it is possible to achieve a quality improvement and product yield of the welded H-shaped steel.

FIG. 1 is an explanatory view schematically showing a configuration of a welded H-section steel manufacturing apparatus according to the present invention. FIG. 2 is a side view conceptually showing the wrinkle inspection apparatus in the manufacturing apparatus shown in FIG. FIG. 3 is a front view conceptually showing the wrinkle inspection apparatus in the manufacturing apparatus shown in FIG. FIG. 4 is an explanatory view schematically showing an example of a manufacturing process of a normal welded lightweight H-section steel. FIG. 5 is a perspective view conceptually showing an enlarged and enlarged view of the vicinity of the welding machine in the manufacturing apparatus shown in FIG.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is an explanatory view schematically showing a configuration example of a manufacturing apparatus 20 for welded H-section steel 21 according to the present invention, and FIG. 2 is an explanatory view conceptually showing a flaw inspection apparatus 22 in the manufacturing apparatus 20. Furthermore, FIG. 3 is a front view conceptually showing the wrinkle inspection device 22. In the following description, the same components as those indicated by the reference numerals in FIGS. 4 and 5 are denoted by the same reference numerals in the drawings, and redundant description will be appropriately omitted.

  Since the manufacturing apparatus 20 of the welded H-section steel 21 according to the present invention includes the uncoiler 3, the flaw inspection apparatus 22, the welding machine 10, the marking apparatus 23, the cutting machine 24, and the control apparatus 25, The components will be described sequentially.

[Uncoiler 3]
The uncoiler 3 includes an uncoiler 3a and an uncoiler 3b. The uncoiler 3 a pays out the long web material 5 from the hot rolled coil 4 and feeds the web material 5 to the welding machine 10 through the looper 26. The uncoiler 3b pays out the long flange material 6 from the hot-rolled coil 4, feeds the web material 5 through the looper 26, divides the web material 5 into two by the slitter 27, and the two web materials 5 is fed to the welding machine 10.

Since the uncoilers 3a and 3b may be those commonly used as this type and are well known to those skilled in the art, further description of the uncoilers 3a and 3b is omitted.
[Wrinkle inspection device 22]
The flaw inspection device 22 is between the looper 26 and the welder 10 (ie, between the uncoiler 3a and the welder 10) and between the looper 26 and the welder 10 (ie, between the uncoiler 3b and the welder 10). ) And the three-dimensional shapes of the web material 5 and the flange materials 6 and 6 are obtained. The two wrinkle inspection devices 22 shown in FIG. 1 detect wrinkles on the front and back surfaces of the web material 5 and the flange materials 6 and 6.

  As shown in FIG. 2, the eyelid inspection device 22 includes a laser light transmission device 22a, a camera 22b, and a signal processing personal computer 22c for a camera-captured image. By a light cutting method using slit laser light, By continuously measuring the cross-sectional shape in the width direction of the web material 5 and the flange materials 6 and 6 with the laser beam transmitter 22a and the camera 22b in the longitudinal direction of the web material 5 and the flange materials 6 and 6, The three-dimensional shape of the steel plate surface is obtained. And the defect site | part in the surface of the web material 5 and the flange materials 6 and 6 and a back surface is specified by signal-processing the data of the obtained three-dimensional shape with the signal processing personal computer 22c. The laser beam transmitter 22a and the camera 22b are mounted on a measurement carriage (not shown) having a C frame structure, and simultaneously measure the front and back surfaces of the web material 5 or the flange material 6.

  The cross-sectional shape obtained from the photographed image of the camera is imaged and image processing is performed to determine the presence or absence of a wrinkle region. If there is a wrinkle, an NG signal is output to the control device 25 (the host process computer in the example shown in FIG. 1), and the control device 25 tracks the position of the detected wrinkle.

  As described above, the wrinkle inspection device 22 uses the optical cutting method using the slit laser beam to determine the cross-sectional shape of the web material 6 and the flange material 6, 6 in the width direction, and the longitudinal direction of the web material 5 and the flange material 6, 6. The three-dimensional shape of each of the web material 5 and the flange materials 6 and 6 is obtained by measuring the direction.

  Further, as shown in FIG. 2, the web material 5 is arranged upstream and / or downstream of the measurement unit 22 d that measures the cross-sectional shape of each of the web material 5 and the flange materials 6 and 6 in the wrinkle inspection device 22. It is desirable to provide a pair of rolls 28 that suppress the flapping of the web material 5 and the flange materials 6 and 6 by pressing the flange materials 6 and 6.

[Welding machine 10]
The welding machine 10 welds the long web material 5 and the flange materials 6 and 6 to be fed into the H-shaped cross section and then welds the web material 5 and the flange materials 6 and 6 so that the long welding is performed. The H-section steel 2 is assembled.

Any welding machine 10 may be used as long as it is commonly used as this type, and is well known to those skilled in the art. Therefore, further explanation regarding the welding machine 10 is omitted.
[Marking device 23]
The marking device 23 is disposed between the welding machine 10 and the cutting machine 24 and is used for marking the web 2a or the flanges 2b and 2b of the long welded H-section steel 2.

  The marking device 23 performs spray marking downstream of the welding machine 10 after tracking the wrinkle position. The spray marking is performed on a portion having a flaw among the outer surface (2 surfaces) of the flange 2b of the long welded H-section steel 2, the inner surface (4 surfaces) of the flange 2, and the two surfaces of the web 2a.

The marking device 23 only needs to be commonly used as this type, and is well known to those skilled in the art, so further description of the marking device 23 is omitted.
[Cutting machine 24]
The cutting machine 24 cuts the long welded H-section steel 24 while traveling in synchronization with the transported welded H-section steel 24 to obtain a welded H-section steel 21 having a desired length. .

The cutting machine 24 may be any one commonly used as this type and is well known to those skilled in the art, and thus further description of the cutting machine 24 is omitted.
[Control device 25]
The control device 25 identifies the positions of the defective portions of the web material 5 and the flange materials 6 and 6 based on the three-dimensional shape obtained by the wrinkle inspection device 22, and the control device 25 marks the identified defective portions. The command is output to the marking device 23.

  And the control apparatus 25 outputs the instruction | command which cuts down the specified defective part to the cutting device 24, or (II) The defective part marked among the welding H-section steel 21 which has desired length A command for conveying the welded H-section steel 21 including the defect to the defect inspection step 29 is output.

The manufacturing apparatus 20 of the welded H-section steel 21 according to the present invention is configured as described above. Next, a situation where the welded H-section steel 21 is manufactured using the manufacturing apparatus 20 will be described.
In FIG. 1, the long web material 5 and the flange materials 6 and 6 paid out from the hot-rolled coils 4 and 4 by the payoff reels 3a and 3b are combined into a H-shaped cross section while being fed and then welded. The web material 5 and the flange materials 6 and 6 are welded by 10 to be assembled into the long welded H-section steel 2. Then, the long welded H-section steel 2 is manufactured as the welded H-section steel 7 having a desired length by being cut by the cutting machine 24.

  In the present invention, after being fed out from the hot rolled coils 4 and 4 and before being combined into the H-shaped cross section, the web material 5 and the flange material are obtained by the optical inspection method using the slit laser beam by the wrinkle inspection device 22. The cross-sectional shapes in the width direction of the web materials 5 and 6 are measured in the longitudinal direction of the web material 5 and the flange materials 6 and 6, respectively, so that the three-dimensional shapes of the web material 5 and the flange materials 6 and 6 are obtained.

  The control device 25 identifies the positions of the defective portions of the web material 5 and the flange materials 6 and 6 based on the three-dimensional shape obtained by the flaw inspection device 22 and welds the web material 5 and the flange materials 6 and 6. Is performed, a command is output to the marking device 23 so as to mark the specified defective part. In response to this command, the marking device 23 performs marking on the specified defective portion.

  And the control apparatus 25 cuts down the marked defect site | part with the cutting machine 24, or according to the grade of the defect of the weld H-section steel 7 containing a defect site | part among the weld H-section steel 7 which has desired length. Whether or not the welded H-section steel 7 can be shipped is determined. If it is determined that the welded H-section steel 7 cannot be shipped, a command for conveying the welded H-section steel 21 to the defect inspection step 29 is output.

  In this way, the defective part is treated by tracking down the defective part with the cutting machine 24 arranged at the rear end of the production line or by taking the product off-line from the line to the inspection process 29 and re-inspecting by the inspector. An inspection may be performed.

  As described above, according to the present invention, the welded H-section steel 21 having a desired length can be manufactured while reliably detecting the surface defects. It is possible to prevent the welded H-shaped steel 21 from being shipped, to easily take measures (treatment such as care and devaluation) when a surface defect occurs, and to take quick measures against the surface defect. It becomes like this.

  That is, according to the present invention, since the surface defect in the web material 5 and the flange materials 6 and 6 before being welded by the welding machine 10 is detected by the flaw detection device 22, the web 2a of the long welded H-section steel 2 is used. Compared with the case where the surface defects of the flanges 2b and 2b are detected by visual observation or the like, the detection accuracy of the surface defects, particularly the surface defects caused by the hot rolled coil which is the material of the web material 5 or the flange materials 6 and 6, is remarkable. The surface defects of the welded H-section steel 21 can be reliably detected.

  Moreover, according to this invention, since the surface defect which originates in the hot rolled coil 4 which is the raw material of the web material 5 and the flange materials 6 and 6 among the surface defects which generate | occur | produce in the welding H-section steel 21, it can identify. It is possible to identify surface defects that occur in the manufacturing process of the welded H-shaped steel 21 and to quickly take measures against surface defects (for example, removal of the cause of surface defects, care of surface defects in products, and reduction treatment). It is possible to improve the yield of the welded H-section steel 21 and improve the quality of the product.

  According to the manufacturing apparatus 20 according to the present invention, the surface flaws of the web material 5 and the flange materials 6 and 6 are detected by the wrinkle detection device 22, and the wrinkles are tracked by the tracking device, and after welding by the welding machine 10, Marking is applied to the collar portion of the welded H-section steel 2 by the marking device 23. The marked portion is usually cut down by the cutting machine 24 in the state of a welded H-section steel.

  On the other hand, before the present application, in order to sort the steel sheet marked by the hot rolling process or the steel plate whose heel position is identified as information in the production line of the welded H-section steel, the inspector should be on the line side. It was not efficient because it had to be placed and searched for the heel part. In particular, after forming the welded H-section steel 2, it is necessary to check for surface defects at a total of 8 locations, 2 on the outer surface of the flange, 4 on the inner surface of the flange, and 2 on the upper and lower surfaces of the web. It was not realistic because of restrictions, multiple inspectors.

DESCRIPTION OF SYMBOLS 1 Manufacturing apparatus 2 Welded H-section steel 3 Pay-off reel 3a, 3b Uncoiler 4 Hot rolled coil 5 Web material 6 Flange 7 Leveler 8 Web upsetter 9 High frequency heating apparatus 10 Welding machine 10a, 10b Pressure roll 10c Position 11 Weld bead forming apparatus DESCRIPTION OF SYMBOLS 12 Cooling device 13 Straightening device 13a Straightening roll 14 Coil splicing machine 20 Manufacturing device 21 according to the present invention Welded H-shaped steel 22 Saddle inspection device 22a Slit laser light transmitter 22b Camera 22c Signal processing personal computer 22d Measuring unit 23 Marking device 24 Cutting Machine 25 Control device 26 Looper 27 Slitter 28 Roll 29 Inspection process

Claims (4)

A long welded H-section steel is assembled by welding the web material and the flange material after being combined into a cross-section H shape while feeding the long web material and the flange material discharged from the hot rolled coil. A method for producing a welded H-section steel having a desired length by cutting the long welded H-section steel with a cutting machine, comprising the following first to fourth steps: A method for producing a welded H-section steel,
First step: After being discharged from the hot-rolled coil and before being combined into a cross-section H-shaped, the cross-sectional shape in the width direction of each of the web material and the flange material by a light cutting method using a slit laser beam Determining the three-dimensional shape of each of the web material and the flange material by measuring the longitudinal direction of the web material and the flange material,
2nd process: Specifying the position of each defective part of the web material and the flange material based on the obtained three-dimensional shape,
Third step: After the web material and the flange material are welded, the identified defective portion is marked, and the fourth step: the marked defective portion is cut down by the cutting machine, or desired Judging whether or not shipment of the welded H-section steel is possible according to the degree of the defect of the welded H-section steel including the defect portion among the welded H-section steel having a length of.   The welding according to claim 1, wherein the web material and the flange material are pressed by a pair of rolls before and after measuring the cross-sectional shape in the width direction of each of the web material and the flange material in the first step. Manufacturing method of H-section steel. An uncoiler that feeds out the long web material and the flange material by feeding out the long web material and the flange material, and the web material and the flange material after combining the long web material and the flange material into a cross-section H shape. A welding machine that assembles a long welded H-section steel by welding, and a cutting machine that cuts the long welded H-section steel into a welded H-section steel having a desired length, and ,
A cross-sectional shape in the width direction of each of the web material and the flange material is arranged between the uncoiler and the welder by a light cutting method using a slit laser beam, and the longitudinal direction of each of the web material and the flange material. A wrinkle inspection device for determining the three-dimensional shape of each of the web material and the flange material by measuring,
A marking device disposed between the welding machine and the cutting machine for marking the web or flange of the long welded H-section steel;
Based on the three-dimensional shape obtained by the wrinkle inspection device, the position of the defective portion of each of the web material and the flange material is specified, and a command to mark the specified defective portion is output to the marking device, and further specified. A command to cut down the defective part is output to the cutting device, or a command to convey the welded H-shaped steel including the defective part out of the welded H-shaped steel having the desired length to the defect inspection process is output. An apparatus for producing welded H-section steel, comprising: a control device.   The wrinkle inspection apparatus includes a pair of rolls that are disposed upstream and downstream of a measurement unit that measures a cross-sectional shape in the width direction of each of the web material and the flange material, and holds the web material and the flange material. The manufacturing apparatus of the welded H-section steel according to claim 3.

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