He was a semi-regular in the 1954-1955 CBS legal drama The Public Defender, starring Reed Hadley as an attorney for the indigent. He appeared in two episodes of The Lone Ranger ("Stage to Tishimingo", 1954 & "Trouble at Tylerville", 1956). In his later years, Welden owned a confection company called Nutcorn, which supplemented his acting income.
Fans of Adventures of Superman remember him well, as he appeared in eight episodes, always as a different character and yet really the same character, in a way. His best-known Superman episode might be "Flight to the North", in which he tries (and fails) to outwit a country-bumpkin type (played by Chuck Connors). In 1966, he acted in episodes 47 and 48 of Batman.
Welden died at age 96 on October 17, 1997, at the Motion Picture & Television Country House and Hospital in Woodland Hills, California. He was survived by a sister.