After discussion with engineering panasonic robot welding, we received suggestion for wire extension of wire Ø 0.8 mm must be set to 10 mm.
Before receiving suggestions, We set wire extension of wire Ø 0.8 mm on 15 mm.
After set wire extension to be 15 mm, we have to change parameter of welding to get a good sample using welding penetration standard (based on 18 December meeting).
Now welding condition parameter is final, and results of height of 6.6 max is stable.