Trying To Pass My MIG Certs

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I started today trying to make a mig coupon which consists of a 2" dia .25" thick tube that requires full penetration.  Once I get going I don't have any problems getting penetration, but can't seem to for the life of me get penetration at the start/end of the weld.  Also, this is being done on a turntable.  Could somebody tell me the trick to starting and stopping the weld on a tube?  I just can't figure it out.My Babies:MillerMatic 185Thermal Arc 300SHobart StickMate AC/DC 235/160Dalex Werke Spot WelderOh and the wife and kids are important too!
Reply:When you tack it together, feather out your tacks and weld up onto them.  You can also change your angle to closer to 90 degrees as you come around to the end.
Reply:I'll give it a try thanks.My Babies:MillerMatic 185Thermal Arc 300SHobart StickMate AC/DC 235/160Dalex Werke Spot WelderOh and the wife and kids are important too!