Post-weld ductility of Type 410 MSS is improved by supplemental induction heating of the HAZ immediately following weld pool solidification. Applying optimum cooling-control methods on the weld seam results in an increase in maximum strain at fracture and a corresponding decrease in. ultimate tensile strength compared with as-welded specimens. Improvements in ductility were more marked in thicker gauges. Strength levels, after a Q+T air-quench hardening cycle, were not affected by the cooling-control process. The as-welded HAZ microindentation hardness is reduced significantly with the addition of the cooling-control process. Applying optimal cooling-control parameters to a seam-welded tube mill increases formability of MSS tubing.
展开▼
