1) Enhanced arc stability and weldability: 
   - Similar level of weldability to inverters can be maintained by application of waveform control technique.

 2) Enhanced output stability to input voltage changes 
   - Stability for output voltage can be maintained by the second voltage feedback not to change the output due to input voltage changes.

 3) Control of current feedback 
   - Arc stability and output current can be consistently maintained by selecting the control measure to feed wires in constant speed despite input voltage changes.

 4) Enhanced arc start characteristics 
   - Control circuit is enhanced by improvement of arc start characteristics so that the smooth arc similar to that of inverter welding machine can be implemented when starting. 

1) Appropriate to large output welding for shipbuilding and steel structures
    - Designed appropriate to long-distance cables. 
    - Designed appropriate to use of single cables. 
    - Preventing weld defects by maintaining stable output despite input voltage changes . 
    - Multifunctional welding machine based on CO2, gauging and manual welding (600H)

 2) Stabilized feeding speed 
    - Arc stability and output current can be consistently maintained by selecting the control measure to feed wires in constant speed despite input voltage changes. 

 3) Stable feeding speed according to the changes for the length of control cables 
   - Stability for output current can be maintained by detecting the changes for the length of control cables and load of feeding motors so that the feeding speed can be stabilized. 

 4) Enhanced prevention of wire pulling : 
   - The wire will stop in the shortest time by using MOS-FET (semi-permanent FET lifecycle) that high response speed to prevent wire pulling after welding is completed.