Welke umpired in the World Series in 1996, 2000, 2003, and 2008. He also worked the League Championship Series in 1991, 1998, 2001, 2002, 2004, 2006, and 2011; and the Division Series in 1995, 1996, 1999, 2000, 2003, 2008, 2010, and 2013. He served as crew chief for the NLCS in 2004 and 2006, the ALCS in 2011 and the ALDS in 1995 and 2000. He was also the crew chief for the 2008 World Series. He umpired in the All-Star Game in 1990, 2005, and 2015.