to fuse (metallic parts) together by heating and/or allowing the metals to flow together or by hammering or compressing with or without heating
to unite (plastics) in a similar manner by heating or by using a chemical solvent
to repair or, produce, or create (something) by or as if by welding such a process
to unite (things) closely or inseparably
to become or be capable of being welded
weldability /-ʹbiliti/ noun
weldable adj
welder noun
[alteration of obsolete well to weld, from Old English waellan to boil]