Abstract
The characteristics of the acoustic signals generated in laser welding are investigated using a two-dimensional model, which was determined based on a theoretical investigation of the process heat balance. Three kinds of welds with different penetration depths induced by the welding parameters have been presented, and spherical field point meshes have also been built to obtain the spatial distributions of the acoustic radiation. The predicted oscillatory frequencies of the weld pools obtained by the modeling process are 1453.125, 1890.625, and 2750 Hz. To effectively isolate the environmental noise sources at the welding site, soundproofing equipment is designed that could reduce the acoustic pressure level of 10 dBA. Typical experiments using the soundproofing equipment are presented in the form of continuous wave Nd/YAG laser welding of an iron workpiece. Three weld shapes are obtained in the experiments at various welding speeds and the associated oscillatory frequencies are 1503.9, 1894.53, and 2792.96 Hz. The results show that the oscillatory frequencies of the weld pool that were predicted by the two-dimensional modeling process agree with the experimental results to within 4 %, which demonstrates the effectiveness of the proposed model for prediction of the acoustic radiation.
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