JPH09264825A - Method and apparatus for inspecting welding strength of welded h-beam - Google Patents

Abstract

PROBLEM TO BE SOLVED: To continuously inspect the welding strength of a welded H-beam during on line passage over the total length thereof by providing rolls so as to generate predetermined tensile stress in a web of the welded H-beam and passing the H-beam in such a state that the rotary surfaces, of the respective rolls are pressed to the inner surfaces of the corresponding flanges in a rotatable manner. SOLUTION: A welded H-beam 1 is passed in such a state that the rotary surfaces of respective rolls 5 are individually pressed to the inner surfaces of the flanges 2 welded and bonded to the upper and lower ends of a web 3 in the height direction thereof. Expanding force 6 is applied to the web 3 between the upper and lower flanges 2 of which the inner surfaces are pressed so as to generate predetermined tensile stress in the web 3 in the high direction thereof. When a welded and bonded parts of which the breaking strength is below predetermined tensile stress of the welded H-beam, that is, the welded inferior parts thereof pass through the gaps between the upper and lower and left and right rolls 5 during the passage of the welded H-beam over the total length thereof, the welding inferior parts are broken. When a welding healthy parts of which the breaking strength is predetermined tensile stress or more pass through the same places, the web 3 is only elastically deformed and no effect is exerted on the quality of the welded H-beam.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding strength inspection method and apparatus for welded H-section steel, and more particularly to a method and apparatus capable of continuously inspecting the welding strength of welded H-section steel during threading.

[0002]

2. Description of the Related Art Welded H-section steel is widely used for construction and structural purposes, and is manufactured by welding two upper and lower flanges made of flat steel and a web made of flat steel by high frequency resistance welding. . If this welding is incomplete, sufficient strength as H-section steel cannot be obtained, so it is required to perform a welding strength inspection in the inspection process.

Welding strength inspection of welded H-section steel is conducted according to JIS G
Normally, it is performed in accordance with the weld zone tensile test stipulated in 3353, but since it is a sampling inspection with a split length of 2500 m, the reliability of the weld strength guarantee is high for most of the untested. Poor. Regarding the improvement of the reliability of the weld strength guarantee of welded H-section steel, as disclosed in Japanese Patent Publication No. 38897/1990, a dedicated device is used for the end of the welded H-section steel cut into commercial lengths. A technique is known in which the upper and lower flanges are spread along both sides of the web in opposite directions until a required load is obtained and the presence or absence of an opening in the welded portion is examined.

According to such an inspection technique, the welding strength of each welded H-section steel cut into commercial lengths can be inspected, so that the reliability of quality assurance is higher than that of the sampling inspection in units of 2500 m in length. However, since it is not possible to spread the welded H-section steel over the entire length, it cannot be said that the weld strength guarantee is perfect.

[0005]

SUMMARY OF THE INVENTION Therefore, the present invention provides a welding strength inspection method and apparatus for welding H-section steel capable of continuously inspecting the welding strength of the welding H-section steel during online threading. It is an issue.

[0006]

According to a first aspect of the present invention, at least each of the inner surfaces of the flanges connected to the web on both sides of the web is at least so that a predetermined tensile stress is generated in the web of the welded H-section steel being threaded. Welded H-shapes are characterized in that rolls are provided corresponding to each one, and the welded H-section steel is passed while the rotation surface of each roll is rotatably pressed against the inner surface of the corresponding flange in the direction of the passage. This is a welding strength inspection method for steel.

In the second aspect of the present invention, at least one is provided on each of the inner surfaces of the flanges connected to the web on both sides of the web of the welded H-section steel being threaded, and the inner surface of the corresponding flange is provided with a rotating surface. Rolls that can contact each other and can rotate in the direction of the passing material, support blocks that cantilever these rolls individually or collectively corresponding to the same inner surface, and are arranged on both sides of the web. On the other hand, the welding strength inspection device for welded H-section steel is characterized by comprising an actuator for applying a predetermined expanding force to the pair of support blocks on the same side.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory view of the first present invention, in which 1 is a welded H-section steel in side view, 2 is a flange, 3 is a web, 4 is the direction of a threading material. 5 is a roll, 6
Is a spreading force, and 7 is a restraining roller. In FIG. 1, one roll 5 is provided on each of the inner surfaces of the upper and lower flanges 2, but the present invention is not limited to this, and any number of rolls may be provided on each inner surface independently of each other. Good.

According to the first aspect of the present invention, the welded H-section steel 1 comprises:
The web 3 is passed while the rotating surfaces of the rolls 5 are individually pressed against the inner surfaces of the flange 2 (on the left and right sides of the web 3) which are welded to the web 3 at the upper and lower ends in the height direction of the web 3. These upper and lower rolls 5 are pressed against each other in an axial arrangement capable of rotating in the threading direction 4, so that they do not interfere with the threading of the welded H-section steel 1. The spreading force 6 is applied so that a predetermined tensile stress in the height direction is generated on the web 3 between the upper and lower flanges 2 whose inner surface is pressed. Since it is inconvenient for the web 3 to be plastically deformed by the expansion force 6, this predetermined tensile stress (referred to as σ _W ) is the yield stress of the flat steel which is the material of the web 3 unless there is a special reason. It is preferable to set a value that does not exceed the limit.

It should be noted that, in FIG. 1, as a preferable mode in which the deformation section of the web 3 by the expanding force 6 applied through the flange 2 is limited to a specific section in the longitudinal direction, it is arranged on the upstream side and the downstream side of the roll 5. It discloses a mode in which constraining rollers 7 for constraining the upper and lower outer surfaces of the flange 2 are arranged.
As a result, when the welded joint having a fracture strength of less than σ _W , that is, the defective weld portion passes between the upper, lower, left, and right rolls 5 while the entire length of the welded H-section steel 1 is passing, the defective weld portion is Break. On the other hand, the quality of the welded H-section steel 1 is not affected because the web 3 only elastically deforms when a welded joint having a breaking strength of σ _W or more, that is, a weld sound portion passes through the same place. .

The weld defect thus fractured can be easily detected continuously in a downstream process continuously and online over the entire length of the welded H-section steel by a conventional method such as visual inspection by an operator or ultrasonic flaw detection. The defective welded portion can be eliminated before shipment, and the user is provided with the welded H-section steel having only the welded healthy portion having the breaking strength of σ _W or more over the entire length.

Therefore, according to the present invention, it is possible to continuously perform the weld strength inspection of the welded H-section steel over the entire length. The second aspect of the present invention is an apparatus suitable for carrying out the first aspect of the present invention (referred to as an apparatus of the present invention). FIG. 2 shows an example thereof, and FIG. 3 shows a cross-sectional view of essential parts of another example. FIG. 2 shows an I posture and FIG. 3 shows an H posture in which welded H-section steel is passed through. 2 and 3, 8 is a support block, 9 is an actuator, 10 is a fixing means, and 11 is a fixed wall.
The same members as those in FIG. Also,
In FIG. 3, reference numeral 12 is a conveying roller. It should be noted that in FIGS. 2 and 3, the direction of the passing material is perpendicular to the paper surface and faces from the back to the front.

As shown in FIGS. 2 and 3, the device of the present invention is
At least one is provided on each of the inner surfaces of the flange 2 connected to the web 3 on both sides of the web 3 of the welded H-shaped steel 1 being threaded, and the rotating surface can contact the inner surface of the corresponding flange 2. And a roll 5 that can be rotated in the direction of threading
A support block 8 that cantilevers these rolls 5 individually or collectively corresponding to the same inner surface, and a web 3
It is characterized by comprising actuators 9 arranged on both sides and applying a predetermined spreading force 6 to the support blocks 8 which are paired with the web 3 on the same side.

As the actuator 9, for example, a hydraulic cylinder or the like can be used. The actuator 9 can be arranged on the fixed wall 11 at an appropriate place with respect to the pass line of the welded H-section steel 1 by using fixing means 10 such as various fixing fittings and fixing beams. The actuator 9 can adjust the pressure so that the reaction force from the inner surface of the flange received via the roll 5 and the support block 8 becomes constant.

Therefore, this constant reaction force is applied to the web 3
If the pressure of the actuator 9 is set so as to be a value commensurate with the above-mentioned σ _W to be generated in the above, the expansion force 6 that causes σ _W in the web 3 passing between the upper, lower, left, and right rolls 5 is relatively increased. Since it can be constantly added to each inner surface of the flange 2, the first aspect of the present invention can be effectively implemented.

[0016]

As described above, according to the present invention,
Welding strength of welded H-section steel during online threading can be continuously inspected over the entire length. Therefore, reliable welding strength can be easily guaranteed over the entire length, which not only improves product quality but also during threading immediately after welding. Since it can be carried out, the time delay until the defective product is found can be extremely shortened, and the generation of defective products can be stopped to the minimum, so that the yield can be improved.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of the first present invention.

FIG. 2 is a sectional view of an essential part of an example of the device of the present invention.

FIG. 3 is a cross-sectional view of main parts of another example of the device of the present invention.

[Explanation of symbols]

 1 Welded H-shaped steel 2 Flange 3 Web 4 Direction of material 5 Roll 6 Expanding force 7 Restraint roller 8 Support block 9 Actuator 10 Fixing means 11 Fixed wall 12 Conveying roller

Claims (2)

[Claims] 1. At least one roll is provided on each of the inner surfaces of the flanges connected to the web on both sides of the web so that a predetermined tensile stress is generated in the web of the welded H-section steel in the thread. A method for inspecting the weld strength of welded H-section steel, wherein the welded H-section steel is passed while the rotational surface of the roll is rotatably pressed against the inner surface of the corresponding flange in the direction of passage. 2. At least one inner surface of a flange continuous with the web on both sides of the web of the welded H-section steel in the threading is provided so as to correspond to the inner surface of the corresponding flange, and the rotating surface can contact the inner surface of the corresponding flange. And rolls that can be rotated in the direction of the passing material, support blocks that cantilever these rolls individually or collectively corresponding to the same inner surface, and are arranged on both sides of the web, respectively on the same side with respect to the web. A weld strength inspection apparatus for welded H-section steel, comprising: an actuator that applies a predetermined expansion force to the pair of support blocks.