Analyses the welding phenomena of first bead( back bead) in large current one side welding using high speed rotating arc, discusses various welding parameters control methods, and indicates the possibility of one side welding.

• 分析了高速旋转电弧大电流单面焊第一层焊道(封底焊道)焊接现象；并对各种焊接参数调节方式进行了讨论；展示了实现单面焊双面成形的可能性.