JPS59150685A - Co2 laser welding machine - Google Patents

Abstract

PURPOSE:To prevent a welding defect even if the cutting accuracy of materials to be welded is low by providing a means for passing compressed gas in the gap between the materials to be welded, and a detector for the wind speed of the gas past the gap, subjecting the output from the detector to signal processing and controlling the welding position of a CO2 laser beam. CONSTITUTION:When compressed air is fed through a pipe 3 into an air well 4, the compressed air passes the gap between materials 1, 2 to be welded and arrives at a wind speed detector 6. The detector 6 is under movement in an arrow C direction, i.e., in a welding direction. The center of the gap between the materials 1 and 2 is detected by detecting the point where the wind speed is max. in the direction perpendicular to the weld line. The signal thereof is fed via a signal processing part 10 to a servocontrol circuit 11. The circuit 11 controls a laser head 5 in accordance with said signal and permits welding by the laser beam in the central position.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a C02 laser welding machine,
This is related to welding position control of the C02 laser beam.

Conventionally, in order to prevent welding position shift when welding two workpieces together by using a CO2 laser welding machine, it was necessary to increase the cutting accuracy of the base metal to be welded. . Therefore, if the cutting blade deteriorates, cutting accuracy may not be obtained, resulting in poor welding.

This invention eliminates numerous drawbacks of the conventional technology, and eliminates weld failure even when the cutting precision of the D-beam is low (-□
02 laser bath welding, the optimal welding position is detected by detecting the velocity of the compressed gas that has passed through the gap between the materials to be welded, and the CO2 The welding position of the laser beam is controlled.

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2p and 2. In ν1, 1 and 2 are the cylinders to be welded by the CO2 laser, 6 is the pipe coming from the compressed core, and 4 is the pipe to be welded without letting the compressed core 2 guided by the pine to the outside. The empty reservoir 5, which feeds the material into the gap between the materials 1 and 2 fut, is a laser head that emits a C02 laser beam.
). 6 is a wind speed sensor placed directly below the air reservoir 4 and moved in the direction of arrow C in synchronization with the radar head 5; 7 is a cedar counter; 8 is a voltage source; 9 is a reference voltage; 10 is a wind speed Signal data 1f141 that processes the output of sensor 6! The parts and 11 receive the output of the signal processing part and connect the laser head 5 and the side speed sensor 6 in the same month.
This figure shows the servo section that moves the servo and the end of 12 compressed air.

Laser beam has coherency
It is well known that because the light has a high intensity, the tip of the leaf can be located at a spot close to the diffraction limit, and a high power density can be obtained. When this laser beam is used for circular welding, since the beam diameter is too small, the above-mentioned welding may not be necessary. can be detected accurately, and therefore the welding position of the C02 laser beam can be controlled so as to perform circulatory contact with the limb position.

In the CO2 laser welding machine of the present invention configured as shown in FIG. 1 and FIG. The wind speed sensor 6 is located. The velocity of the compressed air passing through the gap is faster at the center of the gap and becomes slower as it deviates from the center. The r @ speed sensor 6 located on the low welding line with the C02 laser head 5 is a sensor whose terminal resistance changes depending on the wind speed.While moving this sensor 6 in the bath tangent direction, By detecting the maximum wind speed point, it is possible to detect the center of the gap between the welding pieces 1 and 2.

For example, if the speed sensor 6 used is one in which the resistance value between the terminals increases as the wind speed increases, the output signal of the signal processing unit 10 becomes the minimum at the center of the gap. Move the CO2 laser head 5 and the wind speed sensor 6 so that the output of the processing unit 10 becomes minimum/minimumff1
l+'f, the center of the gap described above can be detected and welded.

In the above embodiment, compressed air is passed through the gap between the materials to be welded 1.2 and detected by the wind speed sensor 6, but instead of this compressed air, another gas such as SF6 gas is used. It's okay.

As mentioned above, this invention reduces the gap between the materials to be welded.
′! By detecting the wind speed through one groove, the center position of the gap can be accurately detected, and the welding position of the laser beam can be controlled to enable welding with the laser beam at the center position. .

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the present invention, and FIG. 2 is a sectional view taken in the direction of arrow A in FIG. 1, with the detection control system block attached. 1.2: Material to be welded, 6: Pipe, 4: Pneumatic grenades, 5: Laser head, 6: Wind speed sensor, 10: Signal processing unit, 11:
Servo part. Agent Tsukuda Kuzuno −

Claims (1)

[Claims] The C02 laser welding machine is equipped with a means for passing compressed gas into the gap between the materials to be welded, and a wind speed detector that detects the wind speed of the gas that has passed through the gap, and the output of the detector is subjected to signal processing. A CO□ laser welding system characterized in that the welding position of the CO2 laser beam is controlled by using the CO2 laser beam.