The permanent joining of metallic parts to form an electrically conductive path that ensures electrical continuity, and the capacity to safely conduct any fault current likely to be imposed.
Merriam-Webster Online Dictionary
bonding (noun)1.
the formation of a close relationship (as between a mother and child or between a person and an animal) especially through frequent or constant association
2.
the attaching of a material (as porcelain) to a tooth surface especially for cosmetic purposes
bonding (Wikipedia)