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.
Sulphide and Its Effect on Solidification Cracking in Weld Metal Steel (Report 4)
