This paper focuses on the laser weldability of additively manufactured (AM) Inconel 718. The experiments of this research were conducted on different series of AM Inconel 718 alloy, i.e. as-built, heat treated (HT), and HT after welding, and comprehensively characterized using optical microscope and electron back scattering diffraction (EBSD). The weld morphology and microstructural evolution of the fusion zone were recorded. The mechanical properties of the welded AM Inconel 718 were evaluated by tensile tests and hardness measurements. It was found that solidification crack and micropore defects are induced in the asbuilt AM Inconel 718. However, defectfree weld was promoted in the HT alloy. The changes in hardness profiles and tensile strength under the experimental parameters were further reported. Homogenous hardness of 500 HV across the weld was obtained when HT was applied after the LW.