A　new　type　of　high　temperature　titanium　alloy,　BTi-6431S,　has　recently　become　the　focus　of　attention　as　a　potential　material　for　aircraft　engine　applications,　which　could　be　used　up　to　700　degrees　C.　Pulsed　laser　welding　was　used　to　butt　join　the　BTi-6431S　titanium　alloy　in　order　to　understand　the　feasibility　of　using　fusion-based　welding　techniques　on　this　material.　The　effect　of　laser　energy　on　the　microstructure　and　mechanical　properties　of　the　joints　was　investigated.　The　microstructural　features　of　the　joints　were　characterized　by　means　of　microscopy　and　X-ray　diffraction.　Tensile　testing　was　conducted　at　both　room　temperature　and　high　temperature　to　simulate　potential　service　conditions.　The　results　show　that　the　microstructure　of　the　laser　welded　joints　consists　of　primary　phase　and　needle　＇　phase,　while　the　microstructure　of　the　heat　affected　zone　consists　of　,　,　and　needle　＇　phases.　The　tensile　strength　of　the　welded　joints　at　room　temperature　was　similar　to　that　of　the　base　material,　despite　a　reduction　in　the　maximum　elongation　was　observed.　This　was　related　to　the　unfavorable　microstructure　in　the　welded　joints.　Nonetheless,　based　on　these　results,　it　is　suggested　that　laser　welding　is　a　promising　joining　technique　for　the　new　BTi-6431S　titanium　alloy　for　aerospace　applications.