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- W2896729072 abstract "The butt-weldability of 6 mm thick F82H (8Cr-2W-V) ferritic-martensitic steel without filler wire has been investigated under various YAG welding conditions: 1.2 kW pulsed, 4 kW cw and 1 + 1 kW pulsed-continuous, for different welding positions (plate, roof, H/V…).A metallurgical analysis of welded beads has evidenced 3 microstructures: a coarse martensitic structure in the weld zone (WZ), a γ-recrystallized structure in the first heat affected zone (HAZ1) and a precipitation zone in HAZ2 close to the base material, whatever the welding conditions. An important hardening (230 HV1kg to 400 HV1kg) was evidenced in both WZ and HAZ, due to the microstructural change. These hardness levels, and the decrease of the brittle-ductile transition temperature, necesitate a post-treatment tempering so that the Martensite recovers ductility and a good mechanical behaviour.It was shown that the use of a pulsed welding at low welding speed (0.1 m/min) minimizes the generation of porosities as compared with cw and that no hot-cracking occurs on 6 mm plates. The porosity generation in continuous mode is attributed to turbulent flows of the molten metal at low welding speed (0.5 m/min) favoring the absorption of atmosphere or shielding gases.Lastly, no specificity was evidenced concerning the welding position and possible gravity effects occurring during welding.The butt-weldability of 6 mm thick F82H (8Cr-2W-V) ferritic-martensitic steel without filler wire has been investigated under various YAG welding conditions: 1.2 kW pulsed, 4 kW cw and 1 + 1 kW pulsed-continuous, for different welding positions (plate, roof, H/V…).A metallurgical analysis of welded beads has evidenced 3 microstructures: a coarse martensitic structure in the weld zone (WZ), a γ-recrystallized structure in the first heat affected zone (HAZ1) and a precipitation zone in HAZ2 close to the base material, whatever the welding conditions. An important hardening (230 HV1kg to 400 HV1kg) was evidenced in both WZ and HAZ, due to the microstructural change. These hardness levels, and the decrease of the brittle-ductile transition temperature, necesitate a post-treatment tempering so that the Martensite recovers ductility and a good mechanical behaviour.It was shown that the use of a pulsed welding at low welding speed (0.1 m/min) minimizes the generation of porosities as compared with cw and that no..." @default.
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- W2896729072 date "2000-01-01" @default.
- W2896729072 modified "2023-09-26" @default.
- W2896729072 title "Pulsed and cw YAG laser welding of F82H desactivated steel for nuclear applications" @default.
- W2896729072 doi "https://doi.org/10.2351/1.5059438" @default.
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