Fusion

Mechanical Engineering

A thorough and complete mixing between the two edges of the base metal to be joined or between the base metal and the filler metal added during welding.

Physics

Nuclear Fusion, the combining of light nuclei to form a heavier nucleus.

See also: Fission, Helium Burning, Hydrogen Burning, Inertial Confinement, Lawson Criterion, Nuclear Reaction, Nucleus, Tokamak.