This　study　proposed　preset　pulsed　magnetic　field　acting　on　process　of　the　short　circuiting　transfer.　It　is　a　controlled　horizontal　magnetic　field　which　attached　at　the　very　beginning　of　contact　between　the　wire　and　the　weld　pool　during　welding.　It　was　found　that　there　exists　optimum　conditions　of　magnetic　field　with　which　preset　pulsed　magnetic　field　could　accelerate　the　rupture　of　the　liquid　bridge　and　reduce　the　peak　value　of　welding　current　in　the　period　of　short　circuiting　transfer.　This　lead　to　energy　accumulation　lowered　at　the　last　phase　of　the　short　circuiting　transfer　and　spatter　loss　reduced　resulting　from　explosive　short　circuit　rupture,　in　the　meantime,　it　could　improve　the　regularity　and　stability　of　the　short　circuiting　transfer　as　well　as　the　weld　shaping　quality.