ductility is the ability for a metal to be
Ductility Ductility is a measure of a material's ability to undergo significant plastic deformation before rupture, which may be expressed as percent elongation or percent area reduction from a tensile test. According to Shigley's Mechanical Engineering Design--10th Ed. [1] significant denotes about 5.0 percent elongation (Section 5.3, p. 233). See also Eq. 2-12, p. 50 for definitions of percent elongation and percent area reduction. Ductility is often characterized by the material's ability to be stretched into a wire.
Metalworking Welding is a fabrication process that joins materials, usually metals or thermoplastics, by causing coalescence. This is often done by melting the workpieces and adding a filler material to form a pool of molten material that cools to become a strong joint, but sometimes pressure is used in conjunction with heat, or by itself, to produce the weld.