The　metal　transfer　behaviour　of　self-shielded　flux　cored　wire　and　the　resultant　welding　spatter　were　investigated　by　using　a　high　speed　camera.　Three　modes　of　metal　transfer　were　found,　i.e.　bridging　transfer　without　arc　interruption　in　explosive　form　or　by　surface　tension,　globular　repelled　transfer　and　droplet　transfer,　while　the　former　two　modes　played　a　key　role　in　the　weld　metal　transfer.　Correspondingly,　the　bridge　explosion,　discontinuous　globular　repelled　process　and　the　misalignment　of　droplets　transfer　were　the　main　factors　causing　the　welding　spatter.