Improvement of UNS S32205 Duplex Welds by GMAW and Controlled Magnetic Field for Offshore Pipelines and Flowlines Applications

Salazar, Μ.; Garcı́a, R.; López, V. H.; Galván-Martínez, Ricardo; Contreras, A.

doi:10.1115/1.4036911

Journal of Offshore Mechanics and Arctic Engineering

2017

DOI: 10.1115/1.4036911

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Improvement of UNS S32205 Duplex Welds by GMAW and Controlled Magnetic Field for Offshore Pipelines and Flowlines Applications

Μ. Salazar

R. Garcı́a

V. H. López

et al.

Abstract: Mechanical properties and corrosion resistance of UNS S32205 duplex stainless steel (DSS) welds obtained under the application of controlled magnetic fields were evaluated in the context of offshore pipelines and flowlines applications. Tensile tests, impact toughness, and hardness measurements were performed. Corrosion behavior was evaluated by linear polarization resistance (LPR) and potentiodynamic polarization curves (PCs) using a synthetic seawater solution at different temperatures. An improvement in ten… Show more

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Cited by 2 publications

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Effect of In Situ Post Weld Heat Treatment on Mechanical Behavior and Austenite–Ferrite Phase Balance of Fe-Cr-Ni/Fe-Cr Stainless Steels Upset Resistance Dissimilar Weld

Ozlati

Movahedi

2019

Journal of Manufacturing Science and Engineering

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Effect of the in situ post weld heat treatment (PWHT) was investigated on the flash profile, austenite/ferrite phase balance, and mechanical properties of the upset resistance dissimilar weld between Fe-Cr-Ni and Fe-Cr stainless steels rods. In order to explore the effect of the heat treatment on the joint strength, two as-welded samples with low strength (116 MPa) and high strength (372 MPa) were used. The results showed that in situ PWHT was beneficial for both welded samples, though in different ways. For the weld with low strength, PWHT improved the joint strength (∼130% increase in the optimum condition compared with the as-welded sample) due to the increase in the size of the flash and the related bonded area at the joint interface. However, ferrite percent in the weld zone increased from ∼50% up to ∼70%. For the sample with the high strength, ferrite/austenite phase balance was restored at an optimum condition of PWHT. However, the joint strength decreased slightly (less than 5%) due to the grain growth in the Fe-Cr rod, i.e., the fracture location. Fracture analysis was used for justification of the variations in the joint strength. For both Fe-Cr-Ni side and Fe-Cr side of the welds, in situ PWHT generally reduced the hardness. This observation is discussed in light of the simultaneous effects of the grain growth and formation of little martensite.

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Effect of In Situ Post Weld Heat Treatment on Mechanical Behavior and Austenite–Ferrite Phase Balance of Fe-Cr-Ni/Fe-Cr Stainless Steels Upset Resistance Dissimilar Weld

Ozlati

Movahedi

2019

Journal of Manufacturing Science and Engineering

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Application of Magnetic Fields to Weld Overlay Cladding to Improve Its Performance in the Oil and Gas Industry

Álvarez

Martínez

Morelos³

et al. 2022

Journal of Manufacturing Science and Engineering

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There are increasingly more aggressive hydrocarbons, as they have high contents of hydrogen sulfide/carbon dioxide, under conditions of high pressure/high temperature (HP/HT). For driving these aggressive hydrocarbons, one of the most cost-effective solutions is the coating and cladding on conventional carbon steel using a corrosion-resistant alloy (CRA). The overlay is one of the methods used for the application of this cladding. However, among the main problems of this method is the dilution and microsegregation, which causes a decrease in corrosion resistance and its subsequent failure. In this work, the application of the gas-shielded metal arc welding process (GMAW) with the interaction of magnetic fields of low intensity is proposed to reduce these problems. API X60 was used as base material and 316L as overlay. The interaction of the magnetic field with the molten metal causes the temperature to become homogeneous, induces grain refinement, reduces the extend of the heat-affected zone (HAZ), leads to a decrement in microhardness, a decrease in dilution and, micro-segregation, as well as the elimination of the magnetic blow, stabilizing the arc. This coating technique can be applied to pipelines and fittings as the trim of submarine equipment used for driving aggressive hydrocarbon.

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Improvement of UNS S32205 Duplex Welds by GMAW and Controlled Magnetic Field for Offshore Pipelines and Flowlines Applications

Cited by 2 publications

References 23 publications

Effect of In Situ Post Weld Heat Treatment on Mechanical Behavior and Austenite–Ferrite Phase Balance of Fe-Cr-Ni/Fe-Cr Stainless Steels Upset Resistance Dissimilar Weld

Effect of In Situ Post Weld Heat Treatment on Mechanical Behavior and Austenite–Ferrite Phase Balance of Fe-Cr-Ni/Fe-Cr Stainless Steels Upset Resistance Dissimilar Weld

Application of Magnetic Fields to Weld Overlay Cladding to Improve Its Performance in the Oil and Gas Industry

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