Contact　tube　wear　is　the　bottleneck　of　industrial　application　for　non-copper-coated　solid　wire.　It　is　crucial　that　we　understand　the　wear　mechanism　of　contact　tube　so　that　we　can　decrease　contact　tube　wear.　The　effects　of　temperature　and　heat　input　on　contact　tube　wear　were　investigated　in　this　work.　The　results　demonstrated　that　fatigue　peeling　was　the　main　wear　mechanism　of　the　contact　tube　at　room　temperature　without　supplying　a　welding　current.　Adhesive　wear,　oxidative　wear　and　abrasive　wear　were　the　primary　wear　mechanisms　of　the　contact　tube　at　450　degrees　C　without　supplying　a　welding　current.　The　wear　rate　of　the　contact　tube　during　welding　was　significantly　enhanced　in　comparison　with　the　wear　rate　at　20　degrees　C　and　450　degrees　C.　The　effect　of　contact　tube　temperature　on　the　wear　properties　of　the　contact　tube　was　limited.　The　wear　rate　of　the　contact　tube　was　increased　with　increasing　heat　input　for　non-copper-coated　solid　wire.　The　wear　mechanism　of　the　contact　tube　was　converted　from　oxidative　wear　to　arc　ablation　at　the　heat　input　of　9114　J/cm.