Temporally resolved temperatures and their gradients were measured in the weld pool during power modulated laser welding of copper to aluminum. A spectrometer and two pyrometers were used to measure temperatures with a high sampling rate of 5 kHz. When welding with a modulation frequency of the laser power of 50 Hz the measured temperature signals show periodic oscillations that correspond to the frequency of the laser power modulation.

Topics
Thermal instruments, Signal processing, Transition metals, Chemical elements, Oscillating flow, Welding
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