A welder once told me that a bad looking weld is just that, bad. I have the same welder and practice make better. Round tubes are tough to weld! Start with two peices of flate or some square tube. Lay them out just as you have the round tube. Practice until you get good smooth purdy welds. Then work on the round tube. Keep a steady hand, proper angle, watch the puddle, be sure you are dragging the puddle, not pushing it. It should come out looking purdy. Good luck, keep welding.