Evaluation of Basic Laser Welding Capabilities.
Technical rept. Jun 74-Oct 75,
UNITED TECHNOLOGIES RESEARCH CENTER EAST HARTFORD CONN
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This report contains the results of the first part of a fundamental study of the deep-penetration laser welding process. The study was conducted during the year 1974-1975 with the objective of generating information relevant to the application of laser welding in manufacturing, with particular emphasis on materials of interest to the Navy. The program has concentrated on 1 a study of the influence of laser parameters on welding performance, and 2 a study of the effect of the physical properties of metals on their laser welding response. In the course of study 1, speedpower relationships were determined, along with the effects of laser operating mode and focusing optics on weld penetration and bead shape and cross-sectional area. As a result of study 2, it was determined that within the range where operation could be maintained in the deep-penetration mode, a linear relationship exists on a log-log plot between a dimensionless speed parameter, and a power parameter which is also dimensionless. It was noted that this represents a direct relationship between speed and penetration under conditions of constant power and focusing optics. This correlation can thus be used to select initial deep-penetration laser welding parameters for any metal providing its properties are known. Energy absorption and melting efficiencies were also determined for a range of elemental metals and a new relationship was determined for the limiting melting efficiency.
- Lasers and Masers
- Fabrication Metallurgy