JPS6284881A - Thick plate weld line detection system - Google Patents

Abstract

PURPOSE:To enable the inclination correction of a beam axis and weld zone by providing the metallic block for beam axis mating and by changing the electron beam irradiating position at high speed alternately, etc. CONSTITUTION:The marking off line corresponding to the weld line 6a, 6b on the upper and lower faces of the body 5 to be welded is drawn by providing the metal block 23 for the beam axis mating on a jig table 7. Moreover, the beam irradiating positional signal 25 is formed at the period n times of a sensing signal 16, the beam is changed into a beam 4a, 4b at high speed alternately and the sensing is performed on the metal block 23. In this case, the weld line 6a, 6b at the upper and lower part is detected and displayed on a picture image display part 13 by picture image display distributing circuit 24 as well. With this method the upper and lower weld lines 6a, 6b are simultaneously detected, so the correction of the inclination between the beam line and the body 5 to be welded can be made easy.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application] The present invention relates to a system for detecting weld lines when welding thick plates using an electron beam.

[Conventional technology]

FIG. 4 shows a conventional weld line detection system. In the figure, numeral 1 is an electron gun, 2 and 3 are deflection coils,
4a is an electron beam, 5 is an object to be welded, and 6a and 6b are the upper and lower surfaces of the welding line, respectively. 7 is a jig table, and 8 and 9 are driving devices, which drive the electron gun 1 or the jig table 7. Reference numeral 10 indicates secondary electrons or X-rays scattered from the metal surface during beam irradiation. After being amplified, the signal is displayed on the screen display section 13. The horizontal axis of the screen of the screen display section 13 is scanned by the sensing current monitor signal of the amplifier section 15.

Reference numeral 16 indicates a sensing signal, and 17 indicates a sensing axis selection circuit.

The conventional welding line detection system is configured as described above, and the selection circuit 17 selects the electron beam 4a in the X-axis or Y-axis direction.
Sensing? ! I! Changes in secondary electrons or X-rays 10 reflected from the workpiece 5 are detected by the sensor 11, and the detection results are monitored on the display unit 13 of the welding line detection device 14. The electron beam irradiation axis and the welding line 6a are brought into alignment each time the electron gun 1 or the jig table 7 is moved by the drive devices 8 and 9.

[Problem that the invention seeks to solve]

Since the conventional welding line detection system is configured as described above, it senses only the upper surface 6a of the workpiece 5, so especially when welding a thick plate, the welded part is inclined with respect to the beam axis. Even if you can't detect it,
There was a problem.

The present invention has been made to solve this problem, and an object of the present invention is to provide a weld line detection system that can correct the inclination between the beam axis and the welded part.

Another object of the present invention is to provide a thick plate weld line detection system that allows easy correction operations.

[Means for solving problems]

The thick plate welding line detection system according to the first aspect of the invention is a system in which lines corresponding to the front and back surfaces (upper and lower surfaces) of the object to be welded are marked on a metal block and fixed to the object to be welded.

Further, the thick plate weld line detection system according to the second invention includes:
Two points on the metal block corresponding to the top and bottom surfaces are alternately irradiated and sensed at high speed, and the detected waveforms of these two points are simultaneously displayed on a monitor scope.

[Effect]

In the first invention, weld lines corresponding to the upper and lower surfaces of the object to be welded can be detected by the metal block, and the inclination between the welded portion of the thick plate and the beam axis can be corrected.

Furthermore, in the second invention, the detected waveforms of the weld lines corresponding to the upper and lower surfaces of the object to be welded can be displayed simultaneously on the screen, making it easy to correct the inclination between the welding part and the beam axis.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, numerals 1 to 4a, 5 to 16 (those with the same numerals as the conventional one explained in FIG. , 20 are amplifiers. 4b is a beam switched by the irradiation position signal 19. 2
Reference numeral 3 denotes a metal block with lines corresponding to the welding lines 6a and 6b marked, etc., and is fixed to the jig table 7. Reference numeral 21 denotes a tilt correction signal, which is added to the sensing signal 16 by an adder 22 to correct the center point of sensing.

FIG. 3 shows the relationship between the I-zo plate weld and the beam axis, with FIG. 3(a) showing the conventional weld and FIG. 3(b) relating to the present invention. In the figure, reference numeral 26 indicates the beam axis, 27 indicates the amount of beam axis correction by tilt correction No. 43, and 2
8 is the amount of movement by the drive device. In the conventional device, the upper surface 6a is aligned with the beam axis 26, but the lower surface 6b is offset.

In contrast, in the present invention, the beam axis 26 and the upper surface 6a are adjusted by the beam axis correction amount 27 and the movement amount 28.
, and the lower surface 6b.

In the thick plate weld line detection system configured as shown in FIG. The inclination of the weld with respect to the beam axis can be corrected.

FIG. 2 shows another embodiment of the present invention, and numerals 1 to 16, 18, 20 to 23 are the same as in FIG. Reference numeral 24 is a distribution circuit for the image display section, and 25 is a beam irradiation position signal generation section.

In the thick plate welding line detection system shown in FIG. 2, a beam irradiation position signal 25 is created at a period n times that of the sensing signal 16, and the beams are alternately switched at high speed as shown by symbols 4a and 4b. The metal block 23 is sensed to detect weld lines 6a and 6b corresponding to the upper and lower parts of the workpiece 5. These detection signals are divided and displayed on the image display section 13 by the image display section distribution circuit 24. At this time, since the irradiation position is switched at high speed, the detected waveforms on the image display section 13 are two, one for the upper surface and one for the lower surface, due to the afterimage effect.

This invention is for correcting the inclination between the beam axis 26 and the welding part, but in the embodiment described in FIG. 1, the upper surface 6a is first detected, and then the upper surface 6b is detected. After that, a series of operations such as moving the electron gun 1 or the jig table 7 and making corrections using the tilt correction signal 21 must be repeated using the drive devices 8 and 9, and the operations are complicated and time-consuming. In the embodiment shown in FIG. 2, the above correction can be easily carried out in a short time. That is,
The image display section distribution circuit 24 and beam irradiation position creation section 25 shown in FIG. Since the tilt correction signal 21 and the tilt correction signal 21 can be adjusted, the operability can be greatly improved.

〔Effect of the invention〕

As explained above, the first invention has a simple structure in which a metal block with lines corresponding to the upper and lower surfaces of the workpiece is fixed to a jig table, and the slope between the beam line and the welding part of the workpiece is This has the effect of making it possible to correct.

Furthermore, the second invention has the effect of facilitating the above-mentioned correction because the beam irradiation position is alternately switched at high speed so that the upper and lower surfaces of the object to be welded can be detected and displayed simultaneously.

[Brief explanation of drawings]

Figure 1 +, 1 A block diagram of a thick plate weld line detection system showing one embodiment of the present invention, Figure 2 is a block diagram of a thick plate weld line detection system showing another embodiment, and Figure 3 is a block diagram of a conventional thick plate weld line detection system. FIG. 4 is a schematic diagram of the main parts of the thick plate weld line detection system, showing a comparison of the thick plate weld line detection results between the conventional system and the system according to the present invention.
The figure is a block diagram of a conventional thick plate weld line detection system. 1: Electron gun, 2, 3: Deflection fill, 4a, 4b: Electron beam, 5: Welded object, 6a, 6b: Welding line, 7: Jig table, 8: W3 tool table driving device) 9: Electron gun Drive device, 13: Image display section, 14: Welding line detection device, 18
: Sensing axis/irradiation position axis selection section, 23: Metal block for beam axis alignment, 24: Image display section distribution circuit, 2
5: Beam irradiation position signal generation unit. Note that the same reference numerals in each figure indicate the same or equivalent parts. Agent: Patent Attorney Masaru Sato Figure 1 Figure 2 Figure 4

Claims (2)

[Claims] (1) A thick plate weld line detection system that includes a weld line detection device, an electron beam deflection device, and a drive device that moves either the electron gun or the jig table, which is equipped with a metal block for beam axis alignment. A thick plate weld line detection system characterized by: (2) A thick plate weld line detection system having a weld line detection device, an electron beam deflection device, and a drive device for moving either the electron gun or the jig table, including a metal block for beam axis alignment, The electron beam deflection device is configured to alternately switch electron beam irradiation positions at high speed, and the welding line detection device is configured to switch between two of the irradiation positions.
A thick plate weld line detection system, characterized in that it is configured to be able to simultaneously display weld lines at points on a screen of a monitor scope or the like.