In this study, we investigated the narrowing of single track width in the pure titanium lattice structure printed by metal additive manufacturing using a laser. In printing using a CW laser, the track width tended to be narrowed due to the high speed or low average laser power. However, if these conditions exceeded certain thresholds, the continuity of the track was broken. Therefore, we showed that narrowing could be done while maintaining continuity of the track despite low laser power by using a pulse laser. In addition, the behaviors of the molten pool and titanium powders during processing were observed using a high-speed camera, and the superiority of pulse laser treatment was discussed.

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