Abstract
A pulse-excited YAG laser beam and two rectangularly modulated CW YAG laser beams transmitted through optical fibres were collimated and condensed to a focal point by combining optics developed to increase laser power for materials processing. We found that the cross sectional shape of SUS304 penetration is strongly dependent on the delay time between incidence of the pulse-excited YAG laser beam and that of the rectangularly modulated CW ones. We obtained a deep penetration welding with half the power density of simultaneous irradiation with both types of laser beam using the combining optics, when we irradiate with the pulse-excited YAG laser beam just after a keyhole has been formed by the previous irradiation with CW YAG laser beams.
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