JPS60164238A - Inspecting apparatus for welded structure - Google Patents

Abstract

PURPOSE:To perform visual inspection of a welded part at one place quickly and readily, by moving a television cameras along a welded line, and extracting the color data components for inspection and the shape data components of the welded part from the picture data obtained by the cameras. CONSTITUTION:A penetrating liquid is applied to a welded part by a color contrast penetrant examination method. After the liquid is wiped out, white developing liquid is applied. Then the defective part is changed into a red color. Television cameras 19 and 20 are moved along the welded line. The movement and expansion operation of the cameras are controlled by a controllers 21. The picture data, which are outputted from the television cameras 19 and 20 are displayed on a picture display part 23 through a picture processing circuit 22. The inspector observes the change in color at the welded part and performs the inspection.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for inspecting welds of large welded structures.

As is well known, dye penetrant testing is the conventional method for inspecting welds for defects and leaks (hereinafter referred to as leaks) in large welded structures such as liquefied natural gas (LNG) storage tanks and ship hulls. method and ammonia detection paint method are used. First, dye penetrant testing is a method in which a penetrant is applied to the weld, and after wiping it off, a white developer is applied, which turns the defective area red, allowing inspection of the defective area. .

In addition, with the ammonia detection paint method, ammonia gas is sealed in the cold insulation layer, and when the ammonia gas leaks from the leakage part, the yellow B, P, B (brome, phenol, blue) paint turns bluish-purple. It is possible to check for leaks by changing the temperature.

By the way, all of the above inspection methods detect changes in color, so conventionally the inspector approaches the area to be inspected and performs a visual inspection using the naked eye or a magnifying glass. .

However, in large structures such as those mentioned above, the length of the welded part is often as long as 20,000 [F71] to 30,000 (171), making inspection work difficult and making work difficult. A problem arises in that the time also increases. In addition, especially when inspecting the side walls and ceilings of large structures, inspection equipment such as scaffolding and gondolas for inspectors is also required, making the above problem even more serious.

The present invention has been made in consideration of the above circumstances, and it is an object of the present invention to provide an extremely good inspection device for welded structures that can quickly and easily visually inspect welded parts at one location.

That is, the welded structure inspection device according to the present invention inspects the welded parts by applying an inspection material to the same lean and continuous welded parts and visually observing the color change. In the inspection method, a television camera for photographing the welded structure, a filter means for extracting inspection items from the image data obtained by the television camera, and an image display of the data obtained from the filter means. a display means for displaying, and an image displayed by the display means to determine the position of the welded part to be enlarged and monitored, and the position is enlarged and photographed by the television camera, and the television camera is moved along the welded part. The invention is characterized in that it is equipped with means for causing the

Hereinafter, an embodiment in which the present invention is applied to an underground tank will be described in detail with reference to the drawings. That is,
As shown in Fig. 1, this underground tank consists of a cold insulation layer 1 along the inner surface of a concrete storage section 11 buried in the soil.
2 is provided, and the cold insulation layer 12 is covered with a welded structure 13. As shown in FIG. 2, this welded structure 13 is constructed by joining together a plurality of (two in the illustrated case) metal thin plates 14 and 15 made of stainless steel or the like at a welded portion 16. be. In this case, for example, according to the dye penetrant testing method, when a penetrating liquid is applied to the welded part 16 and then wiped off, a white developer 17 is applied, and the defective part 18 turns red. be.

Moreover, television cameras 19 and 20 are installed above the underground tank in FIG. 1. The television camera i9, 2ofi is movably supported so as to be able to photograph the entire inside of the welded structure 13, and is equipped with a lens capable of magnification of, for example, 1 to 200 times. The movement and enlargement operations of the television cameras 19 and 20 are controlled by the controller 21. Further, image data output from the television camera 19, 20 is displayed on the image display section 23 via the controller 21 and an image processing circuit 22, which will be described later.

Here, the controller 22 is connected to the computer section 2.
4. The image processing circuit 22 also processes image data while transmitting data to and from the computer section 24. Furthermore, the computer section 24 is configured to output data to an external circuit (for example, a storage circuit that stores image data components obtained by photographing defects and leakage parts of welded parts) 25.

The operation of the above configuration will be described below with reference to the flowchart shown in FIG. That is, image data obtained from the television camera 19 and 20 (hereinafter referred to as original image) is supplied to the image processing circuit 22 via the controller 2. In this case, the original image, as shown in FIG. 3, is a photograph taken at an arbitrary position of the welded structure 13 in a predetermined enlarged state, and the welded part 16 is captured as shown in the figure. There is.

The original image input to the image processing circuit 22 is
First, Stezzo S's hue filter processing creates the color data components necessary for inspection, color data components corresponding to white and red in the case of the dye penetrant testing method, and yellow and blue-violet in the case of the ammonia detection paint method. is extracted. next,
The original image above is subjected to temporal filter processing (step St), which temporally averages the image data of multiple autumnal equinoxes taken at the same location for a certain period of time, so that, for example, the original image may appear on the screen for a short period of time by chance. Images of workers will be deleted. Furthermore, the above original image is
Through the edging process in step 3, shape data components of the welded portion 16 necessary for inspection are extracted. The data subjected to this edge processing is displayed as an image on the image display section 23.

Here, the shape of the welded part 16 of the welded structure 13 is, as shown in the original image of FIG. It is a continuous series of repetitions. For this reason, the above basic 9.
The inspector uses the television camera 1 while looking at the image display section 23 so that the entire turn is displayed on the image display section 23.
By moving 9.20, the inspection point positioning process (step 7''S,) is performed.

When the basic pattern is detected by pressing the button in this way, the inspector next selects the module (
The television camera 19 selects the module l in the area surrounded by a solid line in the original image in FIG.
Enlarged photographing processing (step SS) is performed to move the image by 20 fc. The television camera 1 captures the module l at the center of the display screen of the image display unit 23.
A memory storage process (Stella f86) is performed in which the angle (position) of 9.20 is stored in a memory (not shown) in the computer section 24. Further, in step S, an enlarged photographing execution process is performed for the television shore h-me 719, 20 to enlarge and photograph the monoyl i.

Then, when the module quantity is enlarged and displayed on the image display unit 23, the inspector observes the color change in the welded portion 160 of the module i using the Stella 7'S, and performs an inspection.

Now, considering the case where 16 welding lines are to be inspected among the 9 basic tannins shown in the original image of Fig. 3, the inspector must inspect all 16 welding lines in step S. A determination process is performed to determine whether (ygs) has been completed (ygs) or not (No). In this case, the determination is No, so the inspector moves the television camera 19, 20 along the welding line 161 and performs a television camera and camera movement process (step 81G).

Here, the movement of the television camera 19.20 in step S1° is, for example, the length and direction of the welding line 16, and the image displayed on the image display section 23 when the television camera 19.20 takes an enlarged photograph. If the range of the welding line 161, etc. is known in advance and the corresponding r-t has been input into the computer section 24, these data and the module stored in the memory in step S6 above may be used. Based on the position data of the television camera 19.20 corresponding to i, the unit 24 performs arithmetic processing of: +7 h:s, -p, and connects the television camera 19.20 to the module (, It can be automatically moved to the position corresponding to s+1), or it can be moved manually by the inspector. At this time, the television cameras 19 and 2Q are connected to the module (t
The position data when the position corresponds to +1) is
It will be stored in the memory of the STETSU f86.

When the television camera z9r 2oo movement is completed, the process returns to step S and the module (i+
The test x) is performed. By repeating this operation, when the inspection of modules (i+2) and (1+3) is completed, the judgment of step fS becomes YES, and the inspector inspects the other welding lines 162t or 162t during the above basic turn. 1
Next weld line inspection process to inspect 63 etc. (Stella 768+
Do 1). Welding line 162 according to this step 811
It goes without saying that the test of 163 or 163 is also performed in the same manner as above.

Therefore, according to the configuration of the above embodiment, the inspector does not have to approach the inspected area as in the conventional case, and the visual inspection of the welded portion 160 can be quickly and easily performed at one location.

Furthermore, as mentioned above, by automating the movement of the television camera 19 and 20 used to change the module, and by automating the observation of color changes, visual inspection is further facilitated. It is something that can be done.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and can be implemented with various modifications without departing from the gist thereof.

Therefore, as detailed above, according to the present invention, the welded parts are inspected by applying an inspection material to the welded parts that are continuous in the same turn and visually observing the color change. The welded structure inspection method includes a television camera that photographs the welded structure, and a filter that extracts color data and shape data components of the welded portion for inspection from image data obtained by the television camera. a display means for displaying an image of the data obtained from the filter means; and a display means for determining the position of the welded portion to be enlarged and monitored based on the image displayed by the display means, and determining the position of the welded portion to be monitored by the television camera. Since the television camera is provided with a means for enlarging the photograph and moving the television camera along the welded part, an extremely good welded structure is provided in which visual inspection of the welded part can be quickly and easily performed at one location. An object inspection device can be provided.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a welded structure inspection apparatus according to the present invention, FIG. 2 is an enlarged perspective view of a part of the welded structure of the same embodiment, and FIG. It is a flowchart for explaining the operation of the same embodiment. 11... Concrete storage section, 12... Cold insulation layer,
13... Welded structure, 14.15... Metal thin plate, 1
6... Welding part, 17... Developer, 18... Defect part, 19.20... Television camera, 21... Controller, 22... Image processing circuit, 23... Image Display section, 24... Computer section, 25... External circuit. Applicant Sub-Agent Patent Attorney Takehiko Suzue Figure 1 - Figure 2

Claims (1)

[Claims] In the above-mentioned welding inspection method, a television camera is used to photograph the welded structure by applying an inspection material to a continuous welded part with the same f-turn and visually observing the color change. a filter means for extracting color data and shape data components of the welded part to be subjected to inspection from the image data obtained by the filter; a display means for displaying the data obtained from the filter means as an image; and an image displayed by the display means. and means for determining the position of the welded part to be monitored in a magnified manner, allowing the television camera to photograph the position in an enlarged manner, and moving the television camera along the welded part. A welded structure inspection device characterized by: