1join together (metal parts) by heating the surfaces to the point of melting with a blowpipe, electric arc, or other means, and uniting them by pressing, hammering, etc.:steel plates were being weldedthe truck had spikes welded to the back
forge (an article) by welding.
unite (pieces of plastic or other material) by melting or softening of surfaces in contact.
2cause to combine and form a harmonious or effective whole:cross-curricular themes would weld the curriculum together
