Experimental　and　numerical　methods　are　carried　out　to　analyze　the　interface　formation　and　defect　elimination　mechanism　during　electromagnetic　pulse　welding　T2　to　304L　tube　by　changing　the　inner　tube　morphology　from　original　scheme　to　stage　scheme,　ramp　stage,　and　location　stage.　When　the　original　scheme　is　operated　with　13mm　lap　length,　the　morphology　of　interface　is　divided　into　four　zones　containing　end　unwelded　zone,　first　welded　zone,　central　unwelded　zone,　and　second　welded　zone　due　to　the　different　impact　velocity　and　angle　during　the　initial　impact　process,　parallel　impact　process,　and　final　impact　process.　The　parallel　impact　leads　to　the　formation　of　the　central　unwelded　zone,　containing　(Cu,　Fe)　solid　solution,　oxides,　nano　grains,　and　amor-phous　phase.　By　providing　a　suitable　impact　angle,　the　ramp　scheme　(&　alpha;　=　7　degrees)　and　location　scheme　(L　=　6.5　mm)　can　eliminate　the　defect　in　the　central　unwelded　zone.