This machine consists of the steel plate rotating, push, push diameter welding institution mobile moving and institutions, four parts transmission system respectively by their motor driver. Frequency conversion ratio control system to ensure a skeleton pitch Angle of mouth, with welding speed adjustment and change. Adjust the motor speed ratio, can change the pitch and ring ribs mouth Angle. Adjust welding and welding machine cornstarch, weldability diameter agency 300-1500mm flat tongue-and-groove, 12 socket, length of pipe 4000mm 2000 - reinforced frame.