Wellman managed outside of the Braves organization from 1992 to 2003, with the exception of 2000, when he was a coach for the minor league Louisville RiverBats.

On June 1, 2007, Wellman gained international attention when he went on a tirade against the umpires during a game against the Chattanooga Lookouts at AT&T Field.

He then went on to uproot bases and throw them, crawl in a prone position across the infield like a soldier, and pretend to bite and hurl the rosin bag at an umpire as if it were a hand grenade.

He concluded his tirade by pretending to eject the umpires themselves with a fist-pump and then blowing a farewell kiss to the crowd while taking a bow.

He was still the manager; and on September 13, 2008, he led the Mississippi Braves to the Southern League championship beating the Carolina Mudcats 3-2 in the 10th inning of the decisive Game 5.

Before being ejected, he stood in what appeared to be a military parade rest position, then threw the rosin bag as a grenade.