In　this　paper,　the　focus　rotation　has　been　adopted　in　the　fiber　laser　butt　welding　of　4　mm　thick　Selective　Laser　Melting　GH3536　and　rolled　solid　solution　GH3128.　The　weld　morphology,　microstructure,　microhardness,　joint　strength　and　fracture　morphologies　were　analyzed　by　using　an　optical　microscope　(OM),　a　scanning　electron　microscope　(SEM),　an　electron　back　scattering　diffraction　(EBSD),　a　X-ray　energy　dispersive　spectrometer　(EDS),　a　microhardness　tester　and　a　tensile　testing　machine.　The　results　showed　that　the　focus　rotation　could　effectively　control　the　weld　morphology,　increase　the　fraction　of　high　angle　grains　in　the　welded　joint,　promote　uniform　distribution　of　Fe　from　3D-GH3536　base　material　in　the　welded　joint,　realize　grain　refinement,　and　improve　the　microhardness　of　the　welded　joint.　The　tensile　test　results　show　that　compared　with　the　welded　joint　obtained　in　laser　welding　without　focus　rotation,　the　welded　joint　obtained　by　laser　welding　with　focus　rotation　had　higher　strength.　The　strength　of　upper　part　of　weld　was　increased　by　6.12%　to　reach　98.8%　of　that　of　the　3D-GH3536　base　material,　while　the　strength　of　lower　part　of　weld　was　increased　by　8.30%.　The　welded　joint　obtained　in　laser　welding　with　focus　rotation　has　a　fracture　mode　of　ductile　fracture.(c)　2022　The　Author(s).　Published　by　Elsevier　B.V.　This　is　an　open　access　article　under　the　CC　BY-NC-ND　license　(http://creativecommons.org/licenses/by-nc-nd/4.0/).