During his first season in 2012 at UT-San Antonio Welborn became one of the most consistent performers on the team. He hit .260 in 46 starts for the team with 20 RBIs and a .359 on base percentage. Before joining the Roadrunners he played one season at Paris Junior College in Paris, Texas in 2011. In his lone year at Paris Welborn was named First-Team All-Region XIV, hitting .410 with 20 RBIs. In high school he was a standout on his Sherman High School baseball team, being named All-District and team MVP his senior year in 2010.