Welding characteristics with three Nd:YAG laser beams transmitted through single optical fiber

Abstract

A YAG laser processing system in which three YAG laser beams were combined on the input end of single optical fiber and transmitted through the optical fiber was developed. The effects of various oscillation waveforms on penetration depth were examined by using this system. As a result, it was confirmed that the penetration depth with a rectangular modulated laser beam was deeper than that such a continuous laser beam, and the depth made with the rectangular modulated laser beam superimposed pulse laser beam was deeper than that by former two type laser beams, though the average output powers of the three type laser beams were equal each other. The effective delay time of the pulse laser beam after rising of the rectangular modulated laser beam was two or three millisecond to obtain the deepest penetration. Moreover, the penetration depth increased with an increase in the pulse laser beam power to the total one.A YAG laser processing system in which three YAG laser beams were combined on the input end of single optical fiber and transmitted through the optical fiber was developed. The effects of various oscillation waveforms on penetration depth were examined by using this system. As a result, it was confirmed that the penetration depth with a rectangular modulated laser beam was deeper than that such a continuous laser beam, and the depth made with the rectangular modulated laser beam superimposed pulse laser beam was deeper than that by former two type laser beams, though the average output powers of the three type laser beams were equal each other. The effective delay time of the pulse laser beam after rising of the rectangular modulated laser beam was two or three millisecond to obtain the deepest penetration. Moreover, the penetration depth increased with an increase in the pulse laser beam power to the total one.