Investigation of the influence of welding parameters on the weld geometry when welding structural steel with oscillated high-power laser beam

摘要

Oscillation of the laser beam has been applied to achieve a positive influence on the efficiency of the welding process and the quality of the weld seam. In this work a 10 kW laser beam from a fiber laser was oscillated with frequencies up to 1000 Hz for bead on plate welds in 15 mm thick structural steel to investigate the influence of beam oscillation on geometrical dimensions of the weld seam. The laser beam was oscillated transversally with a given amplitude for each frequency. The parameter set to be varied was laser power, welding speed and focal point position according to the highest influence on the formation of the weld seam and the welding process. The results obtained show that lower oscillation frequencies in the range of 200 Hz with higher amplitudes in combination with either low welding speeds or higher laser powers up to 10 kW had the greatest influence on the geometry of the weld seam.