Historical clue formulations

• Joins a heavy metal band, say — 2022-06-11
• Fuses — 2019-12-29
• Joins — 2018-06-17
• Joins — 2010-09-05
• Joins — 2007-12-29
• Repairs a leak, possibly — 2006-09-30
• Fuses by heat — 2003-09-09
• Joins — 1997-01-26
• Fuses — 1995-08-16
• Unites — 1994-07-26