Welding

Welding is a fabrication or sculpturalprocess that joins materials, usually metals or thermoplastics, by causing coalescence. This is often done bymelting the workpieces and adding a filler material to form a pool of molten material (the weld pool) that cools to become a strong joint, with pressuresometimes used in conjunction with heat, or by itself, to produce the weld. This is in contrast with soldering and brazing, which involve melting a lower-melting-point material between the workpieces to form a bond between them, without melting the workpieces.