JPS58181474A - Remote monitoring device for weld zone - Google Patents

Abstract

PURPOSE:To enable the monitoring of the high luminance part and low luminance part of a weld zone as a sharp picture image with roughly equalized brightness in the stage of remote monitoring the weld zone with an optical device, by using a specific composite filter differing in light transmittance. CONSTITUTION:A mixed filter 6 consisting of a central part 6a where transmittance of light is low and a peripheral part 6b where transmittance of light is high is disposed in the midway of an optical system in the stage of remote monitoring the part 2 to be welded and monitored of a weldment 1 with the optical device. The light from the molten part 11 where the luminance is extremely high in the real image in the part 2 formed with a convex lens 4 passes through the part 6a of low transmittance of the filter 6 and the light from the bead part 12b and groove part 12c of a welding base material 12a where the luminance is low passes through the part 6b of high light transmittance; therefore, the picture image having the equalized luminance is formed on the target 8a of an image pickup tube 8. The image is converted to an electric signal with a controller 9, and is remotely monitored as the sharp picture image having the averaged luminance on a television monitor 10.

Description

[Detailed Description of the Invention] The present invention provides welding monitoring targets (groove, weld, bead, etc.) during fusion welding (arc welding, plasma welding, plasma arc welding, electron beam welding, laser welding, etc.). This invention relates to a remote monitoring device for welding parts that observes the shape and color of welds.

The welding part remote monitoring device focuses light from the part to be monitored by an optical system, converts it into an electric signal by an imaging tube controller, and observes it on a television monitor. however,
In conventional welding zone remote monitoring devices such as the one shown in F, the state of the welding zone to be monitored is displayed as an image on the TV monitor, so the high brightness area (molten zone) of the welding zone to be monitored is It was not possible to observe both the brightness area and the low brightness area (periphery of the melted area) at the same time. In other words, when the filter and diaphragm of the optical system are adjusted to monitor high-brightness areas, it is difficult to observe low-brightness areas due to insufficient light, and when the filter and diaphragm are adjusted to monitor low-brightness areas,
The amount of light at Takayanagi Dobe was too high, causing halation and making it impossible to observe.

The present invention was made by focusing on the problems mentioned above in conventional welding part remote monitoring devices. By using a filter, the purpose is to solve the problem described in 1.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described with reference to the accompanying drawings, which illustrate embodiments thereof.

At a predetermined distance from the welding monitoring target part 2 of the workpiece l,
An optical system is constructed by arranging a filter 3, a first convex lens 4, an aperture 5, a composite filter 6, and a second convex lens 7 in order on the same optical axis. The distance between each element of the optical system is such that the light beam emitted from the welding monitoring target part 2 forms a real image on the composite filter 6F by the first convex lens 4, and this real image is further transferred to the target 8 of the image pickup tube 8 by the second convex lens 7.
This is to give Egami a real image. The image pickup tube 8 and the controller 9 convert this real image into an electrical signal and send the electrical signal to the television monitor 10. As shown in FIG. 2, the composite filter 6 has a central portion 6a made of a transparent material with low light transmittance, and a peripheral portion 6b made of a transparent material with high light transmittance.

Next, the effect will be explained.

As shown in FIG. 3, the welding monitoring target part 2 of the workpiece l is
A high-temperature, high-intensity, approximately circular molten part 11 (for example, in the case of electric F-beam welding, the part in contact with the electric F-beam), and the surrounding F+2 material 12a and heat part 12b, which have a relatively low temperature of 11'II degrees. and a groove part 12C (hereinafter, the melted part 11 will be referred to as the "high brightness part 11", and the f-shaped material 12
a, B+:;Xa 12 b and groove portion 12c are referred to as “low brightness portion 12”). The front beam from the welding monitoring target part 2 passes through the filter 3, the first convex lens 4, and the diaphragm 5, and forms a real image at the position of the composite filter 6. This real image is as shown in FIG. 4 (in this figure, the image of the welding monitoring target part 2 is indicated by adding '' to the corresponding reference numeral).

As described above, the composite filter 6 has a central portion 6a with low light transmittance and a peripheral portion 6b with high light transmittance, but the light beam corresponding to the high brightness portion 11 passes through the central portion 6a. , and the light beam corresponding to the low brightness portion 12 passes through the peripheral portion 6b. Therefore, the luminous flux that has passed through the composite filter 6 is approximately equalized over the entire image of the welding monitoring target section 2. The light beam whose light beam has been equalized in this way is refocused by the second convex lens 7, and the target lens of the image pickup tube 8) 8aE
image is formed. The controller 9 converts this into an electrical signal and sends it to the television monitor 10, and displays the image on the television monitor 10h (note that on the image, the image of the welding monitoring target part 2 is indicated by the corresponding reference numeral with a - attached to it. (shown below). As mentioned above, the light input to the image pickup tube 8 has a substantially uniform tip over the entire image, so that the image on the television monitor 10
The image h also has almost uniform brightness, and the high r4 claw part 1
1 and the low brightness portion 12 can be observed simultaneously on the same screen.

Note that, as in the second embodiment shown in FIG. 5), the second convex lens 7 can be removed and the composite filter 6 can be placed just in front of the image pickup tube 8. In this case, the position of the composite filter 6 does not completely coincide with the imaging position, so in a part of the image, the light flux that has passed through the central part 6a of the composite filter 6 and the light flux that has passed through the peripheral part 6b overlap; There is no problem with the sharpness in practical use.

Note that in the two embodiments described in (1)--, a medium-sized convex lens is used in the optical system, or a compound lens may be used to eliminate aberrations, or a zoom lens may be used. It is also possible to remove the filter and diaphragm. Several types of composite filters are available with different area ratios between the central part with low light transmittance and the peripheral part with low light transmittance, depending on the size of the high brightness part and the magnification of the optical system. Then, an appropriate composite filter may be selected and used depending on the conditions of use.

As described above, according to the present invention, an optical system that focuses light from a part to be monitored for welding, an image pickup tube/controller that converts the light focused by the optical system into an electrical signal,
In a welding joint remote monitoring device consisting of a television monitor that displays an image of the ``tunqieven'', a composite filter having a central part with low transmittance and a peripheral part with higher light transmittance than the central part is used in the optical system. As a result, the light weight in the high-brightness area and the low-brightness area is equalized, and the shape and color of the high-brightness area and low-brightness area of the welding monitoring area can be adjusted to an appropriate level of brightness without causing insufficient light or halation. It can be observed with clear images.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a welding part remote monitoring device according to the present invention, FIG. 2 is a diagram showing a combination filter of the welding part remote monitoring device according to the present invention, FIG. 3 is a diagram showing a welding monitoring section, and FIG. 4 is a diagram showing a welding part remote monitoring device according to the present invention. FIG. 5 is a diagram showing a real image of a welding monitoring section, and FIG. 5 is a diagram showing a welding part remote monitoring device according to a second embodiment of the present invention. 1. Welding object, 2. Welding monitoring target part, 3φφe filter, 4. 0. First convex lens, 5. Aperture, 6.
...Composite filter, 6a, central part, 6b, peripheral part, 7, second convex lens, 8, image pickup tube, 8a,
...Target, 9...Controller, lO...TV monitor, 11.Skewer, melting part (high brightness part), 12...Low f4 degree part, 12a...m material, 12b... bead part,
12c... Groove section.

Claims (1)

[Claims] An optical system that focuses light from a part to be monitored for welding, an imaging controller that converts the light focused by the optical system into an electrical signal, and a television monitor that displays the electrical signal as an image. A welding part remote monitoring device characterized in that an optical system is provided with a composite filter having a central part with low light transmittance and a peripheral part with higher light transmittance than the central part. Department remote monitoring device.