White, the former University of New Mexico standout, arrived Saturday night and immediately went into practice with the Dragons yesterday.
The 6-foot-6 White, also a former Wichita State’s Evans junior college star, replaces Rob Sanders, who earlier took over the spot of the injured Charles Clark.
The Dragons have lost their last four games since beating the Air21 Express, 103-99, in overtime last March 30.
Welcoat’s last defeat came at the hands of the Express, 94-102, last April 22 despite Alex Compton’s career-best output of 38 points.