This　study　focused　on　the　mechanical　properties　and　microstructure　of　fiber　laser-welded　joints　of　Ta-10W　alloy　manufactured　by　selective　laser　melting　(SLM)　and　rolled.　In　the　SLMed　base　material　side　of　the　weld,　columnar　grains　were　formed　along　the　weld,　extending　up　to　half　of　the　weld　width.　The　base　material＇s　anisotropy　influenced　the　subgrain　morphology,　and　grain　orientation　changed　after　welding.　When　the　building　direction　of　the　SLMed　Ta-10W　was　perpendicular　to　the　welding　direction,　slender　columnar　subgrains　were　prone　to　forming　in　the　SLM　side　weld.　In　contrast,　when　the　building　direction　was　parallel　to　the　welding　direction,　equiaxed　subgrains　tended　to　form　in　the　weld.　In　the　rolling　base　material　side　weld,　mainly　equiaxed　grains　were　formed,　with　subgrain　morphology　and　orientation　randomly　distributed.　In　the　weld　center,　fine-grain　zones　of　10-20　mu　m,　comprising　fine　grains　of　2-5　mu　m　diameter,　were　observed　in　all　welds　under　study.　Room-temperature　tensile　strengths　of　both　welds　were　approximately　620　MPa,　falling　between　the　strengths　of　the　two　base　materials.　Their　fracture　surfaces　displayed　a　mixed　mode　of　cleavage　and　intergranular　fracture.　High-temperature　strengths　of　rolled-SLMed　joints　varied　with　SLM　directions　X　and　Z,　reaching　124.94　and　107.87　MPa,　respectively,　and　exhibiting　similar　fracture　characteristics　dominated　by　intergranular　fracture.