Welding Characteristics with a 1.2kW CW YAG Laser Light Transmitted through a Fiber

概要

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Recently continuous wave YAG laser output power has been increased by using a method of arranging sub-assemblies consisting of a YAG rod, an exciting lamp and a pumping cavity in series in a laser resonator. By transmitting a laser light through a quartz fiber, new applications and systems of laser materials processing which have not been carried out by CO_2 laser light can be put to practical use. In this report, after launching a 1.2 kW CW YAG laser light into a fine core portion of a fiber, we studied the welding characteristics of the laser light transmitted through the fiber by comparing them experimentally with those of a direct condensed laser light and got the following results. (1) The welding characteristics using fiber optics are like those of a CO_2 laser having an objective lens of long focal length, with low power density and less inluence of defocusing distance. (2) The saturated bead width approaches the image of the fiber core at the ratio of 1 : 1 with aberration of condensing optics, using fiber optics. (3) The profile of power density above the fusion threshold for SUS304 using fiber optics at laser power of 840 W and a welding speed between 5-70 mm/s is flattened and that using direct optics is gaussian. (4) Bead width dependence on laser power using fiber optics is less than that of direct optics and is determined mainly by the NA of the fiber.
社団法人溶接学会の論文
1990-10-01