Aiming　at　the　application　of　contact　tip　wear　of　non-copper　coated　solid　wires　in　robot　auto-welding,　C-MoS2-Fe2O3(Fe3O4)　nano-composite　lubricants　were　prepared　on　the　surfaces　of　non-copper　coated　solid　wires　by　a　mechanical　coating　technique.　The　effects　of　C-MoS2-Fe2O3(Fe3O4)　lubricants　proportion　on　the　contact　tip　wear　were　investigated.　The　results　demonstrate　that　lubricating　property　of　C-Fe3O4　coatings　outperformed　lubricating　property　of　C-Fe2O3　coatings.　The　anti-wear　performance　of　the　contact　tip　was　enhanced　with　an　addition　of　nano-MoS2.　The　formation　of　protective　self-repairing　films　at　the　rubbing　interface　of　welding　wires　against　the　contact　tip　was　attributed　to　the　tribochemical　reaction　among　lubricants.　The　tribofilm　composition　were　FeO,　MoS2　and　MoO3　which　lubricating　properties　are　excellent.　They　can　avoid　direct　contact　of　welding　wires　against　the　contact　tip,　thus　the　contact　tip　wear　was　inereasdel.　Oxidative　wear,　abrasive　wear　and　arc　ablation　were　the　primary　mechanisms　of　the　contact　tip　wear.　©　2019,　Editorial　Board　of　Transactions　of　the　China　Welding　Institution,　Magazine　Agency　Welding.　All　right　reserved.