Abstract:
Number of Industries including marine, oil and
gas, pharmaceutical are facing challenges in welding of
thick section duplex stainless steel (DSS) to attain desired
microstructure and mechanical properties. The DSS is dual
phase structure comprising of austenite and ferrite in equal
proportion. The present work is aimed to investigate
microstructure and mechanical properties of DSS 2205
thick (20 mm) plate weld for pressure vessel by multi-pass
shielded metal arc welding using E2209 electrode to
maintain heat input 0.5–1.5 kJ/mm. Weldment was tested
for ferrite measurement, tensile, impact, hardness and bend
test by cutting across the weld. Scanning electron microscope
and optical microscope were used to examine
microstructures at weld zone and heat affected zone. In
microscopic examination, widmanstetten austenite, intra
granular austenite and grain boundary austenite were
observed in weld zone while partially transformed
austenite in heat affected zone.
