Document Type and Number:
Japanese Patent JPS4746160
Kind Code:
B1
Abstract:
1,255,704. Cutting and welding by fusion. COMPAGNIE GENERALE D'ELECTRICITE. 14 Jan., 1969 [15 Jan., 1968], No. 2206/69. Headings B3R and B3V. [Also in Divisions G2 and H1] In a laser welding, boring or cutting arrangement in which the outputs of a plurality of lasers 1-4, Fig. 1, are concentrated by optical systems on to a single point on a workpiece 13, damage to the optical systems by splutter from the workpiece is prevented by a partially transparent and partially reflective protective tape 44 moved relatively to the lasers. Ruby lasers pumped by flashlamps (not shown) may be used, the laser outputs being passed through prisms 5-8 to a zoom lens 11 which focuses the outputs on to the required point. The protective tape 44 is continuously moved during operation and is repeatedly punctured by the laser output pulses. For boring and cutting, the focal length of the-zoom lens 11 is changed by a programmecontrolled motor 12 so as to correspond with the speed of penetration of the light beam. Programming is effected by 14 which includes a pick-up device 13 for measuring the thickness of the workpiece. The workpiece, which may be tungsten, may be moved during the welding or cutting process by a drive 17. An alternative arrangement is shown in Fig. 3 in which each laser 20, 21 is aimed at the common point and has its own optical system of variable focal length which may be either a zoom lens 36 or a lens turret 32. The common point 31 of output beam concentration is illuminated by a light source 39, which may be a continuous laser, the output of which is focused by a variable focusing system 40. The lasers 20, 21 are initially aimed at the illuminated point by a positional adjusting arrangement which comprises a fixed ring 25 carrying a member 26 capable of relative rotation, each laser being supported on a rod 28 having a lockable joint 30, the rod itself being lockable in a guide 28 in the member 26. In this arrangement a small proportion of the laser outputs are reflected from the surface of the movable transparent tape 44 and are detected by a calorimeter 55, the calorimeter causing adjustment of the zoom lens 36 according to the energy detected. The lasers of the arrangement may be fired in succession.
More Like This:
| JP5381766 | Welding method |
| JP2000271772 | METHOD AND MACHINE FOR LASER BEAM MACHINING |
| WO/2006/009916 | METHOD FOR CALIBRATION AND CERTIFYING LASER PROJECTION BEAM ACCURACY IN TRACING |
Application Number:
JP266869A
Publication Date:
November 21, 1972
Filing Date:
January 16, 1969
Export Citation:
International Classes:
B23K26/02; B23K26/06; B23K26/08; B23K26/12; B23K26/16