JPH0653311B2 - How to visualize welding status during welding - Google Patents

Description

TECHNICAL FIELD The present invention relates to a visualization method for monitoring a welding condition during welding.

[Conventional technology]

In the past, when monitoring the welding status during welding, the arc light intensity (brightness) was too high.Therefore, when monitoring the arc surrounding status, the arc light was suppressed using a light-shielding plate specified in JIS. There is a first way to monitor on a monitor through a camera.

In addition, there is a second method using a filter that lowers the light transmittance near the arc point in order to reduce the light intensity only at the arc point instead of the light shielding plate of the first method.
The filter in this case has a high density ND at the center of the filter.
A filter-like thing is provided.

[Problems to be solved by the invention]

In the first method, the surroundings of the arc are also shielded, and it becomes difficult to monitor the melted condition, which is important for ensuring the quality of welding, through the camera and on the monitor.

The second method requires that the camera position and the center of the arc always match exactly, and the intensity of the arc light in the obtained image is extremely low, so an arc that can be obtained by a person through a light-shielding surface. There was a defect that the shape information could not be obtained sufficiently and could not be used for arc abnormality detection.

Therefore, an object of the present invention is to provide a welding condition visualization method capable of clearly observing the welding condition under a high-strength welding arc.

[Means for solving problems]

In order to achieve the above object, the present invention is a welding state visualization method for observing the welding state under arc light by a combination of a filter consisting of a 6000 to 6500 Å filter and an infrared cut filter and a camera system. .

[Action]

According to the above method, the welding condition can be clearly observed under the welding high strength arc.

〔Example〕

Hereinafter, the present invention will be described with reference to the drawings. FIG. 1 is an overall view showing the relationship between a monitoring system and a welding torch for explaining the method of the present invention, and here shows an example applied to TIG welding. In the figure, 10 is a welding torch, and a camera box (visual sensor system box) 11 is provided for the welding torch 10 with respect to the potentiometer 1.
The relative relationship is always kept constant by 2 and 13, and the vertical position of the camera box 11 is controlled by the camera box driving motor 14 via the control unit 15. Also, the welding wire 16
Is controlled to a horizontal position and a vertical position by a wire horizontal position drive motor 17 and a wire vertical position drive motor 18.

As shown in FIG. 2, the camera box 11 includes a camera body 111, a lens system 112, an interference filter 113, and an interference filter control motor 114, which are fixed image pickup elements.
Is installed. This interference filter control motor 114
Driven by the interference filter 11 on the optical axis of the camera during welding.
3, the interference filter 113 is rotated and removed from the optical axis of the camera during non-welding so that the beat shape after welding can be monitored.

The lens system 112 is a lens diaphragm system 11 as shown in FIG.
2b, as shown in FIG. 5, cut light rays of 8000 Å or more. The external light cut filters 112a and 112c include a filter fixing ring 112d and a lens system adapter 112e.

The interference filter 113 is composed of an interference filter body 113a and an interference filter holder 113b as shown in FIG. 4. The interference filter body 113a is, for example, silica glass deposited with silver, and as shown in FIG.
It has a maximum transmittance of 500Å. Such an interference filter 113 is arranged at an angle of 15 to 40 ° with respect to the optical axis.

By using the monitoring system described above, it is possible to clearly observe the welding situation under the high-intensity arc (welding high-strength arc) light. This is an interference filter 113 having a maximum transmittance between 6000 and 6500Å and an infrared light cut filter 112a, 1a that cuts light rays of 8000Å or more.
As shown in FIG. 5, the arc light intensity distribution and the molten pool light intensity distribution shown in FIG. It is darkly projected and the welding situation is clearly visible.
As shown in FIG. 7, this welding state is a front bead shape, a groove shape, a molten pool shape, an arc shape, a wire position, and an electrode shape which are detection targets necessary for performing high quality welding.

Further, since the infrared light cut filters 112a and 112c for cutting light rays of 8000 Å or more are provided, as shown in FIG. 6, the amount of charge leakage between adjacent pixels is minimized on the image sensor which is likely to occur on the long wavelength side. Suppressed, which results in better quality images.

Further, since the interference filter 113 is installed at an angle of 15 to 40 ° with respect to the optical axis, it is possible to prevent a ghost (virtual image) caused by the reflection of light between the back surface of the interference filter and the camera optical system.

〔The invention's effect〕

According to the present invention described above, it is possible to provide a welding condition visualization method during welding for observing the welding condition under arc light by using a combination of a filter consisting of a 6000 to 6500Å filter and an infrared cut filter and a camera system. .

[Brief description of drawings]

FIG. 1 is a diagram showing the relationship between a monitoring system and a welding torch for explaining the method of the present invention, and FIGS. 2 to 4 are diagrams for explaining the configurations of the camera box, lens system and interference filter of FIG. 1, respectively. FIG. 5 is a diagram showing the characteristics of the infrared light cut filter and the interference filter in FIG. 1, and FIG. 6 is a graph showing the amount of charge leakage between adjacent pixels with respect to the wavelength of the image sensor in FIG. FIG. 7 and FIG. 7 are schematic diagrams showing TIG welding conditions. 111 ... Camera body, 112 ... Lens system, 113 ... Interference filter, 114 ... Interference filter control motor.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Takashi Ishide 2-1-1, Niihama, Arai-cho, Takasago-shi, Hyogo Prefecture Takasago Laboratory, Mitsubishi Heavy Industries, Ltd. (72) Takao Ikeda 2-chome, Niihama, Arai-cho, Takasago-shi, Hyogo No. 1 Mitsubishi Heavy Industries, Ltd. Takasago Research Institute (72) Inventor Haruo Yawata 1-1-1 Wadazakicho, Hyogo-ku, Kobe, Hyogo Prefecture Mitsubishi Heavy Industries Ltd., Kobe Shipyard (72) Inventor, Kazuhiko Kamo Kobe, Hyogo Prefecture 1-1-1 Wadazakicho, Hyogo-ku Mitsubishi Heavy Industries Ltd. Kobe Shipyard (72) Inventor Takeshi Nishida 7-1-14 Wadamiya-dori Hyogo-ku, Hyogo-Kobe Nishibishi Engineering Co., Ltd. (56) References Special Kai 57-202968 (JP, A)

Claims (1)

[Claims] 1. A welding condition under arc light is 6000-6.
A welding condition visualization method during welding, which is observed by using a combination of a 500 Å filter, an infrared cut filter, and a camera system.