This　study　proposes　an　efficient　approach　which　uses　1064　nm　continuous　fiber　laser　to　achieve　nanoscale　welding　of　crossed　multi-walled　carbon　nanotubes　(MWCNTs).　By　changing　the　irradiation　time,　different　quality　of　nanoscale　welding　is　obtained.　The　morphology　changes　are　investigated　by　scanning　electron　microscope　(SEM)　and　transmission　electron　microscope　(TEM).　The　experiments　demonstrate　that　better　quality　of　MWCNTs　nanoscale　welding　after　3　s　irradiation　can　be　obtained.　It　is　found　that　new　graphene　layers　between　crossed　nanotubes　induced　by　laser　make　the　nanoscale　welding　achieved　due　to　the　absorption　of　laser　energy.　(C)　2018　Elsevier　Ltd.　All　rights　reserved.