JPS60213387A - Method and device for welding plate materials - Google Patents

Abstract

PURPOSE:To improve welding quality by setting a pair of laser beams having respectively different optical axes in such a way that the focuses at the butt parts of plate materials are parted at a prescribed interval and irradiating alternately the laser beams at every prescribed time. CONSTITUTION:The pulse laser beams 9, 9' passing through condenser lenses 3, 3' via reflecting mirrors 4, 4' and 5 are condensed to the converging beams which melt the plate materials 1, 1' at the respective arrival points 10, 10' when the beams 9, 9' are alternately irradiated to said materials at every prescribed time. A part 8 to be welded is therefore alternately welded when the materials 1, 1' are so moved that the part 8 faces the top end of a working head 7 and when an assist gas is supplied from a gas supply port 6. The quality of the weld zone is assured even if the space in the joint part is increased and therefore the welding quality is improved by the above-mentioned method.

Description

DETAILED DESCRIPTION OF THE INVENTION [Provisional Summary of the Invention] The present invention relates to a welding method and a welding device for plate materials that improve quality.

〔Mirai technology〕

Conventionally, the equipment for butt welding plates using a Lede beam is one that applies the beam to the joint part of the beam t1 and welds the seam in a linear manner, as shown in Figure 1.
In the figure, the laser beam +61k is focused by the lens 131, the converged beam is applied to the joint (8), and the welding nozzle (2) or the welded @u+(1') gold is placed in the direction perpendicular to the plane of the figure. Welding is performed while moving. At this time, in order to remove the plasma generated in the mating part (8), assist gas such as argon gas is supplied to the nozzle (2) through the supply port (
7) and is brought into contact with Tg while being injected from the tip of the nozzle (2).

In addition, if there is a gap in the plate u That is, in FIG. 2, the convergent beam arrival point is set toward the welded material 1, which is offset from the gap center line.

If the gap is small, this will allow for a sufficiently high quality weld.

However, when the gap becomes large compared to the plate thickness,
Welding becomes impossible with the method shown in Figure 2. Therefore,
Conventionally, in order to widen the applicable gap range as much as possible, a method has been used in which the focus position of the beam is shifted to increase the diameter of the convergent beam. Increasing the convergent beam diameter in this way not only widens the weld bead width and increases the input energy, but also increases the heat-affected area of the plate and increases the amount of distortion, making it difficult to improve welding quality. I rarely got the point that it was.

[Summary of the invention]

This invention was made to eliminate the above drawbacks.
A method for welding plate materials, in which a pair of laser beams with different optical axes are set so that their focal points at the abutting part of the plate materials are at a predetermined interval, and the V-de beam is alternately irradiated at predetermined time intervals, and Provides a disguise.

[Embodiment of the invention] FIG. 8 shows an embodiment of the invention. In the figure, (1)(
1') fi plates arranged at a predetermined interval 't-, (2) d-joint application nozzle % + a + Cs')
are condensing lenses, a pair of which are fixed to the nozzle +21 via a predetermined support member, and each focal point is set to the plate +u (1')
o 141 (4') are the reflecting mirrors placed facing each other at a predetermined angle, and (6
) is the anti-lvt jump m (with reflectors placed between the four,
The light received from each reflecting mirror (4) is condensed by a condensing lens (1).
31 (It is made to turn around and reflect. (6
) is the gas supply port connected to the nozzle (2), above, 21
Processing head (7) capable of irradiating with a radar beam at ~(6)
4 memorial services were held. (8) is the 4JL junction, (9) (
Reference numerals 9') and 1nl (4') respectively indicate Raded beams irradiated toward the reflection 1nl (4'), and are, for example, pulsed Raded beams that alternately emit outputs in opposite directions. (101 (10 are convergent beam arrival points, which are spaced at predetermined intervals.

In such an 81st, a pulsed laser beam (91
(9') 'a' When irradiated alternately at predetermined time intervals,
Reflection *141 (through the four and (5) condenser lens taI
(Lede beam passing through s +91 (9 are converged,
It becomes a convergent beam and each reaching point 1101 (1G'
), the plate material n+ (1') k @ mA. Therefore, the plate material +u (1 t-S) is moved so that the fluorescent cap (8) faces the tip of the processing head (7), and the gas supply port 1
p11 junction 5 by supplying assist gas from 6)
(8) are welded alternately.

In addition, each pulse has a different optical axis +91 (9 times 8
It may be supplied from one laser oscillator, or it may be dividedly supplied from 18 laser oscillators. Furthermore, irradiation may be performed alternately for each single pulse and for each gL pulse.

〔Effect of the invention〕

As explained above, according to the present invention, the focal points of the laser beams at the joint portions of all the plate materials having different optical axes are set at a predetermined interval ft, and all the laser beams are alternately focused at predetermined intervals. By doing so, the quality of the weld can be ensured even if the distance between the joints becomes somewhat large.

[Brief explanation of drawings]

Figures 1 and 2 are configuration diagrams showing conventional ones, respectively.
FIG. 8 is a block diagram showing an embodiment of the present invention. In FIG. (7)
is the processing head, i91 (9 is the laser, shout (lO')
#i Non-focal 〇 In each figure, the same reference numerals indicate the same or equivalent parts. Agent Masuo Odai Figure 1 Figure 5 Figure 2 Figure 3

Claims (1)

[Claims] 1) In a method of laser beam welding the abutment part fV of plate material T-wings, a pair of laser beams each having different optical axes are set so that their focal points at the abutment points are set at a predetermined interval. and a method for g-welding plate materials, characterized in that the laser beam is irradiated alternately at predetermined time intervals. (2) Welding of a pair of laser beams with different optical axes at the abutting point by welding plate materials together using a laser beam, which is equipped with a processing head so that the focal points at the abutting point are shifted by a predetermined distance. Device.