The tranafer and spatter of big droplets show obvicusly periodic characteristic, and the small droplet spray transfer and spatter exist through whole welding.

• 大颗粒熔滴的形成、长大，直到发生过渡、爆炸或偏飞具有明显的周期性特征，而小颗粒的喷射过渡或飞溅则伴随焊条燃烧全过程。