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Soldagem & Inspeção

versão impressa ISSN 0104-9224versão On-line ISSN 1980-6973

Resumo

PAULA, Mariana Pessoa Medeiros de; MODENESI, Paulo José  e  TRINDADE, Vicente Braz. Analysis of the Influence of Welding Parameters on Microstructures and Mechanical Properties of Welding Joints of an API X70Q Steel Tube for the Sour Service Application. Soldag. insp. [online]. 2018, vol.23, n.2, pp.180-190.  Epub 10-Jul-2018. ISSN 0104-9224.  http://dx.doi.org/10.1590/0104-9224/si2302.06.

Abstract

The X70 steel is a material that has a good relation between mechanical strength and toughness, being very used in conduction and transport of oil and gas. With the objective to evaluate the weldability, the microstructural and mechanical characteristics were evaluated along the cross section of joints obtained by GTAW (root) and GMAW (filling) processes of API 5L X70QS seamless steel pipes. The pipe segments machined in J bevel, welded with circumferential rotation to maintain flat welding position with three different heat inputs. Test specimens for tensile tests, Vickers hardness, Charpy impact and chemical analysis, besides metallographic characterization was made for base material and welded joints. The grade X70QS obtained and welded with different heat inputs showed excellent mechanical behavior and particularly low HAZ hardness.

Palavras-chave : seamless pipe; steel API 5L X70QS; GMAW; GTAW; heat imput.

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