Join 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.
A widely distributed plant related to mignonette, yielding a yellow dye
they simply welded sheets of metal together
Join (a piece of metal) to another without the use of heat, by forcing them together so hard that the surface oxide films are disrupted and adhesion occurs
Weld (something) with the edges overlapping
Join by welding at a number of separate points