Estudo do processo de fabricação de tubos flexíveis de aço inoxidável duplex UNS 32304 utilizados na indústria de petróleo e gás

Abstract

Resumo A principal característica dos aços inoxidáveis duplex é o equilíbrio entre as fases austenita e ferrita

Influence of Pulsed Arc Parameters on the Tig Welding Process for the Stainless Steel Duplex UNS S31803

“…Oil and gas extraction from deep ocean waters is demanding increasingly unique technologies and materials. As an important resource which has been widely used for the transport of fluids and instrumenting systems on offshore platforms, flexible pipelines are complex structures with multiple layers whose number and type depend on the specific design requirements [1,2].…”

“…Therefore, in its manufacture, metallic strips of stainless steel of different classes are used including the UNS S31803 steel depending on the severity of the fluid to be transported. In the specific case of oil, it will depend on the type of productive well, particularly corrosive aspects of the oil withdrawn from this well [1,2].…”

“…Due to the complexity of the structures produced, some regions of the generated joint may be potential sites of structural problems. This becomes more serious the greater the complexity of the alloy to be welded [1][2][3].…”

“…In addition to all requests during the manufacturing process of these pipelines, in field conditions they are subject to several constraints, among which it is worth mentioning the tensile loading of the entire assembly. In addition, compression loads can be experienced during installation in deep water, namely a buffer effect due to high hydrostatic pressure, or, in extreme situations, such as when the floating unit operates in low top angle conditions and is subject to sudden movements [1,4]. This whole complex loading system leads to a greater concern about the quality of the materials and process in use.…”