Answer: fusing

AnswerCrossword Clue
FUSINGSolderer's activity
fusingstitch by applying heat and pressure with or without the use of an adhesive
fusingFUSE, to equip with a detonating device, also FUZE
fusingbecome blended or joined by or as if by melting together
fusingblend thoroughly by or as if by melting together combine
fusingfail because of the blowing of a fuse
fusingbecome fluid with heat
fusingto reduce to a liquid or plastic state by heat