Beaudin was the first player signed by the Jets, and played on a line with superstar Bobby Hull and centre Christian Bordeleau in the Jets' inaugural season. He had his best pro season by far, as all three members of the line scored over 100 points; Beaudin contributed 38 goals and 65 assists for 103 points, and was named to play in the WHA's first All-Star Game in 1973. He led the WHA playoffs in scoring that year with a sparkling 13 goals and 15 assists as the Jets lost to the New England Whalers in the league finals, highlighted by a seven-point game against the Minnesota Fighting Saints.
Beaudin's production dropped sharply the next season, and in 1974 he and Bordeleau were replaced as Hull's linemates by Swedish stars Anders Hedberg and Ulf Nilsson. After the Jets' AVCO World Trophy championship in 1976, Beaudin signed with Swiss team SC Langnau, with whom he played for two seasons before retiring.