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Abstract
Friction taper stitch welding (FTSW) is a novel technique that uses multiple inserts to conceal surface crack in a given substrate. The inserts are rotated and forced to fill the crack as plasticized material, and forge with the substrate in solid-state. The process is well suited for alloys such as duplex stainless steel, which suffers degradation of properties during fusion welding. A detailed experimental and theoretical investigation is presented here on FTSW of a duplex stainless steel (DSS). The experimental results show the presence of a ferrite-rich phase along the interface. The results computed by the numerical process model reveal a direct influence of thermal cycle in the amount of ferrite along the joint interface. The welded joint shows near homogeneous structure and properties similar to those of the substrate.
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1 Indian Institute of Technology Palakkad, Palakkad, India (GRID:grid.494639.5) (ISNI:0000 0004 6022 0646)
2 Federal Institute of Rio Grande do Sul (IFRS), Caxias do Sul, Brazil (GRID:grid.462197.f) (ISNI:0000 0004 0370 1902)
3 Federal University of Santa Maria (UFSM), Cachoeira do Sul, Brazil (GRID:grid.411239.c) (ISNI:0000 0001 2284 6531); Physical Metallurgy Laboratory (LAMEF) - PPGE3M/UFRGS, Porto Alegre, Brazil (GRID:grid.411239.c)
4 Physical Metallurgy Laboratory (LAMEF) - PPGE3M/UFRGS, Porto Alegre, Brazil (GRID:grid.494639.5)
5 Indian Institute of Technology Bombay, Mumbai, India (GRID:grid.417971.d) (ISNI:0000 0001 2198 7527)