Run machine to one end, the air-actuated clamp is loosening at initial status. Lay workpiece on platform and make it touch positioning block, then clamping it. Moving machine here, adjust welding torch and the welding position, lower torch to the right height, adjust welding torch by manual. Set up programming as drawing, then all welding work will be done automatically. That’s to say, press the welding button, water pump begins to work... Sensor feedbacks the arc signal to CNC controller after arc striking is successful, transverse motor gets the instruction from controller, and begins to work, the oscillator drives torch as well. When one seam welding is finished, controller gives a stop instruction. The gun lifts automatically after welding finished, oscillator stops work, longitudinal moving to opposite for next welding, torch stops moving when arrives at position indicated, and do the welding after getting striking arc instruction, oscillator works again. Repeat it till whole workpiece finished. Lift up torch, back to start position, do next welding. Whole welding procedure is automatically.