Engineered Weld Design: Are Composite Welds Likely in the Future?
Utilizing alternating welding process parameters, deposition practices, and welding consumables, particularly during multiple pass welding, it is possible to improve a variety of weld metal properties. There are available a number of phenomena occurring during welding that allow weld metal designers the ability to generate macro- and micro-structural features amenable to implementation of composite theory. These phenomena include solidification microsegregation during dendrite growth, gas-metal reactions between the selected alternating shielding gas composition and weld pool, and solidification microstructural orientation during welding. Additional methods of producing composite welds including specially designed weld compositions, weld metal solidification modification by arc pulsing, and dual wire deposition may be utilized to achieve single pass and multipass composite weld metal deposition. Composite welds are a potential method to solve challenging demands such as high-toughness at low temperature, creep strength at high temperature, and customized design for corrosion, wear, or cracking resistance.
Changhee Lee, Jong-Bong Lee, Dong-Hwan Park and Suck-Joo Na
D.L. Olson et al., "Engineered Weld Design: Are Composite Welds Likely in the Future?", Materials Science Forum, Vols. 580-582, pp. 307-310, 2008