Kun Sun

TL;DR: In this article, the microstructure evolution of the welded joints was carefully observed by means of optical microscope (OM) and scanning electron microscopy (SEM) in a single pass without groove preparation and filler metals.

TL;DR: In this article, the microstructures, secondary phase precipitation and susceptibility to localized corrosion of UNS S32101 duplex stainless-steel welded joints that were welded using underwater dry and wet flux-cored arc welding (FCAW-136).

TL;DR: In this article, phase balance, interface boundaries, and grain types were characterized in local dry underwater welded DSS metals, and the results showed that the austenite content of the weld metals decreased first, then increased and then decreased with the increase in the simulated water depth from 0.1m to 75m.

TL;DR: The results indicated that the microstructure of both two welded joints was similar, however, Martensite and martensite-austenite components were significantly different with different underwater welding methods such that themicro-hardness of the HAZ and FZ in the ULCW specimen was higher than that of the corresponding regions in UDW joint.

TL;DR: The microstructure and mechanical properties of underwater hyperbaric flux-cored arc (FCA) welded duplex stainless steel joints were investigated in this paper, where Austenite in different zones exhibited different micro-textural components.