<p>Corrosion is a big issue in the oil and gas industry forcing the application of nobler materials and advanced processes for manufacturing equipment. Cladding is a cost-effective solution in pipes, pressure vessels, and other offshore structures. Despite the mechanical and corrosion performance, productivity is also crucial to the final result of each project since high costs are associated with this area. Consequently, advanced technology for obtaining single-layer quality claddings reduces costs while maintaining required properties. In this regard, superaustenitic stainless-steel filler metals are selected as an alternative to nickel alloys in some applications for technical or economic reasons. Although these alloys are extensively applied in the industry, the literature addressing the properties of weld claddings using superaustenitic stainless steels is still scarce. Considering that weld metals can show different properties compared to the base metals, it is imperative to study its behavior in order to provide enough knowledge for safe claddings. This work shows innovative results of single-layer claddings produced by the Gas Metal Arc Welding with Rotating Electrode with overlaps varying from 50 to 70% between adjacent weld tracks to provide the minimum desired thickness, appropriate mechanical properties, and corrosion performance. The results obtained in mechanical and electrochemical tests, supported by the microstructural characterization, revealed ultimate tensile strengths at least 20% higher, microhardness inside the limits accepted, and critical pitting temperatures around 10% higher compared with the AISI 904L steel. Also, increased overlap rates promoted a higher thickness and superior mechanical and corrosion properties, becoming an alternative to improved results. Thus, the GMAW-RE process can be suggested as appropriate to producing single-layer weld claddings suitable for equipment of the offshore industry.</p>

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Microstructure, mechanical and corrosion properties of weld claddings suitable to offshore equipment produced by the GMAW process with rotating electrode: effect of overlapping

  • Hiron A. Y. Magalhães,
  • Jeferson F. M. Costa,
  • Jorge C. F. Jorge,
  • Luís Felipe G. de Souza,
  • Matheus C. Mendes,
  • Leonardo S. Araújo,
  • Humberto N. Farneze

摘要

Corrosion is a big issue in the oil and gas industry forcing the application of nobler materials and advanced processes for manufacturing equipment. Cladding is a cost-effective solution in pipes, pressure vessels, and other offshore structures. Despite the mechanical and corrosion performance, productivity is also crucial to the final result of each project since high costs are associated with this area. Consequently, advanced technology for obtaining single-layer quality claddings reduces costs while maintaining required properties. In this regard, superaustenitic stainless-steel filler metals are selected as an alternative to nickel alloys in some applications for technical or economic reasons. Although these alloys are extensively applied in the industry, the literature addressing the properties of weld claddings using superaustenitic stainless steels is still scarce. Considering that weld metals can show different properties compared to the base metals, it is imperative to study its behavior in order to provide enough knowledge for safe claddings. This work shows innovative results of single-layer claddings produced by the Gas Metal Arc Welding with Rotating Electrode with overlaps varying from 50 to 70% between adjacent weld tracks to provide the minimum desired thickness, appropriate mechanical properties, and corrosion performance. The results obtained in mechanical and electrochemical tests, supported by the microstructural characterization, revealed ultimate tensile strengths at least 20% higher, microhardness inside the limits accepted, and critical pitting temperatures around 10% higher compared with the AISI 904L steel. Also, increased overlap rates promoted a higher thickness and superior mechanical and corrosion properties, becoming an alternative to improved results. Thus, the GMAW-RE process can be suggested as appropriate to producing single-layer weld claddings suitable for equipment of the offshore industry.