This　study　proposes　an　efficient　approach　that　uses　a　1064　nm　continuous　fiber　laser　to　achieve　nanoscale　welding　of　crossed　multiwalled　carbon　nanotubes　(MWCNTs).　We　investigate　the　effects　of　laser　irradiation　time　(from　1　to　6　s)　on　the　structure　changes　and　the　welding　quality　of　crossed　MWCNTs　using　a　scanning　electron　microscope,　transmission　electron　microscope,　and　Raman　spectroscopy.　The　experimental　results　demonstrate　that　(1)　after　2　or　3　s　laser　irradiation,　moderate　temperature　of　MWCNTs　can　be　formed　and　can　cause　a　higher　degree　of　graphitization　and　(2)　the　degree　of　graphitization　and　effective　contact　of　nanowelded　MWCNT　junctions　strongly　affects　its　electrical　properties.　(C)　2018　Optical　Society　of　America