Weld spatter and metal transfer are badly influenced by characteristics of welding arc of metal powder core flux-cored wire. The change rule of metal transfer and weld spatter about metal powder core flux-cored wire were studied by high-speed camera. The analysis results show tthat the forms of metal transfer including short circuiting transfer, repelled transfer, globular transfer along with parameters increasing, the transition frequency and stability of globular transfer are higher, which is the idedal m...