JPH01147361A - Ultrasonic inspecting device - Google Patents

Abstract

PURPOSE:To accurately and continuously inspect the welding state of a welded material by forming spherically the surface of probes which contact a material to be inspected, and providing a means which marks a welding defective part and a running means. CONSTITUTION:Driving wheels 14 are so arranged as to clamp a material 10 to be welded 10 and rotated by motors 16 to move the device along a weld line. The ball pen type probes 22 are brought into contact with the material 10 to be welded from both sides and connected to an ultrasonic flaw detector 23. The ball pen type probes 22 are scanned along the recessed part formed in the material 10 to be welded by seam welding and one probe 22 sends an ultrasonic wave to the other probe 22; and the ultrasonic flaw detector 23 monitors the quantity of the transmitted ultrasonic wave and judges a welding defective position when the attenuation of the quantity of the transmitted wave increases and a marker 36 injects a paint.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an apparatus for inspecting welding defects after welding, and particularly for inspecting welding defects when large-sized materials are seam welded. This invention relates to improvements in ultrasonic testing equipment.

[Prior Art] Seam welding of large non-welded materials is often carried out on the roofs of buildings, so waterproofness is a more important evaluation target than in normal welding. Therefore, water leakage due to poor welding becomes a fatal defect.

However, conventionally, in such cases, the unwelded portions have only been inspected by observing the appearance of the bead after welding is completed, and no particular equipment has been developed for inspecting welding defects.

On the other hand, it is conceivable to use a widely known ultrasonic inspection device as a method of inspecting the welding state. Such a device estimates the internal condition from the amount of ultrasound transmitted, and utilizes the fact that ultrasound is transmitted from one side of the object to the other to the other, and attenuation increases when there is a defect. .

[Problems to be Solved by the Invention] However, as described above, the method of simply inspecting the welding state based on its appearance does not allow accurate inspection; for example, in the case of welding the roof of a structure, the entire construction The defects were only discovered after rain fell after the work was completed, making subsequent repair work difficult.

Further, in the case of a device using ultrasonic waves, although accurate inspection can be performed, it is extremely difficult to inspect the entire welded part when the object to be inspected is large.

The present invention has been made in view of the above, and an object of the present invention is to provide an ultrasonic inspection device that can easily and accurately inspect the welding state of a welded portion of a large-sized workpiece.

[Means for Solving the Problems] The ultrasonic inspection apparatus according to the present invention includes: a probe whose contact surface with the material to be welded is formed in a spherical shape; a mark means for marking a welding defective location; The above-mentioned problem is solved by providing a traveling means that travels following the welding line of the material to be welded.

[Function] In the present invention, firstly, since the contact surface of the probe with the welded material is formed in a spherical shape, the welded material to be detected is detected by utilizing sliding or rolling contact of the spherical surface. surface can be scanned smoothly.

secondly, a marking means for marking defective welding locations;
Since it includes a traveling means that travels following the welding line of the welded material, it is possible to continuously detect welding defects even if the detection target is a large-sized welded material.

[Embodiments] Hereinafter, embodiments of the present invention will be described by lit M et al. with reference to the accompanying drawings.

The present invention will be described by taking as an example a case in which a joint of a roofing material of a structure made of vibration-damping steel plates is seam-welded and then a welding defect in the weld is detected.

FIG. 1 shows a schematic configuration of an inspection device according to the present invention together with a cross section of a material to be welded 10 made of a damping steel plate, and FIG. 2 shows details of a detection section of the device.

10 is a material to be welded made of a thin vibration-damping steel plate as described above, and 12 is a seam welding location where welding is performed. As shown in the figure, the joint portion of the material to be welded 10 is made by abutting two damping steel plates against each other and bending one damping steel plate so as to wrap the other. Therefore, three damping steel plates are welded at once.

Although only one pair of drives of the device is shown in the figure,
This is done by two pairs of front and rear drive wheels 14. That is, the drive wheel 14 is arranged so as to hold the non-weld material 10, and the drive wheel 14 is rotated by a motor 16 to move the device along the welding line.

At this time, the weld line is copied by sliding the tip of a ballpoint pen type probe 22 (described later) into the concave portion formed by seam welding. At the same time, the material to be welded 10
The upper end of is supported by a support member 18.

A support roller 20 runs on the horizontal portion of the non-welded material 10 and balances the device in the left-right direction, and is installed so that it can be adjusted in the height direction and steered left and right.

Reference numeral 22 denotes a ballpoint pen type probe, which contacts the non-welded material 10 from both sides, is connected to an ultrasonic flaw detector 23, and is designed to detect welding defects using an ultrasonic transmission method. Hereinafter, the probe 22 will be explained in detail with reference to FIG.

In FIG. 3, a spherical compressed rubber sphere 24 is inserted into the outer frame 26 so as to protrude from the tip of the outer frame 26 by approximately a hemisphere. A liquid layer 30 made of water, oil, etc. is interposed between the compressed rubber sphere 24 and the vibrator 28, and the compressed rubber sphere 24 and the vibrator 28 transmit ultrasonic waves to the liquid layer 30. The waves are transmitted through the rubber sphere 24 into the material to be welded 10, and the waves transmitted within the material to be welded 10 are transmitted through the rubber sphere 24. The other probe 2 via the liquid layer 30
2.

25 is a vibrator holding member, 27 is a lead wire, and 29 is a connector.

In this way, the probe 22 in this embodiment
Since the contact surface with 0 has a spherical shape, the flaw detection surface can be smoothly scanned by utilizing the sliding of this spherical surface. Moreover, since the rubber sphere 24 is made of hard rubber, even if the flaw detection surface has a bead shape, it absorbs vertical vibrations caused by scanning, and the smoothness of scanning is not lost.

The ballpoint pen type probe 22 is not limited to this, but may be a dry type without the liquid layer 30,
Furthermore, the rubber sphere 24 is fixed to the external frame 26,
It is also possible to make the contact with the material to be welded lO even smoother by providing it rotatably and rolling contact.

Reference numeral 32 denotes a couplant supply device, which supplies couplant to the liquid layer 30 through a supply pipe 34.

Reference numeral 36 denotes a marker which, when a defective welding point is detected by the ultrasonic flaw detector 23 using the ballpoint pen type probe 22, sprays a mist of paint onto the defective welding point via a connected vibrator 38. ing.

Reference numeral 40 denotes a control device, which controls the entire ultrasonic inspection apparatus described above.

That is, when a defective welding portion is detected by the probe 22, this control device immediately controls the injection of paint from the marker 36, the drive control of the drive wheel 14, and the like.

Next, the overall operation of the above embodiment will be explained.

The height of the support roller 20 after welding the welded material 10 with a seam welder (not shown).

The inspection device is set on the workpiece 10 by adjusting the distance between the drive wheels 14, the position of the support member 18, and the position and distance of the probe 22.

Next, by driving the motor 16 and rotating the drive wheel 14, the inspection device is caused to travel, and the ballpoint pen probe 22 is caused to scan along the concave portion of the welded material 10 formed by seam welding.

Then, ultrasonic waves are transmitted from one probe 22 to the other probe 22, and the ultrasonic flaw detector 23 monitors the amount of ultrasonic waves transmitted at any time, and the point at which the attenuation of the amount of transmission becomes large is determined by welding. It is determined that the location is defective, and paint is injected from the marker 36.

Finally, repair the welding defects where the paint has adhered.

In the above-mentioned embodiment, leakage can be inspected linearly with respect to the weld line for each joint, and repairs can be made when there is scaffolding for construction. Therefore, there is an advantage that leakage points can be repaired extremely easily and accurately.

Note that the present invention is not limited to the above embodiments,
It is also possible to place the ultrasonic inspection device immediately after a self-propelled seam welding machine and run it together with the welding machine.

[Effects of the Invention] As described above, the present invention has the advantage that the welding state of a welded portion of a large non-welded material can be accurately and continuously inspected.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing an embodiment of the present invention, FIG. 2 is a configuration diagram showing the main parts of the embodiment, and FIG. 3 is a sectional view showing the structure of the main parts of the embodiment. "Explanation of symbols of main parts" 10... Material to be welded, 12... Sea welding location, 14.
... Drive wheel, 16 ... Motor, 22 ... Ballpoint pen type probe, 23 ... Ultrasonic flaw detector, 36 ... Marker Note that the same reference numerals in each figure indicate the same or corresponding parts. Agent Patent Attorney Tadashi Sato Figure 1

Claims (3)

[Claims] (1) In an ultrasonic inspection device for inspecting the welding state of a welded material, the probe has a spherical contact surface with the welded material;
An ultrasonic inspection apparatus comprising: a marking means for marking a welding defective location; and a traveling means that travels along a weld line of the material to be welded. (2) The ultrasonic inspection apparatus according to claim 1, wherein the material to be welded is a damping steel plate. (3) The ultrasonic inspection apparatus according to claim 1 or 2, wherein the contact surface of the probe with the material to be welded is formed of hard rubber.