Influenza del gas di protezione sul comportamento e le proprietà  di giunti sa dati di acciai duplex e superduplex: Effect of shielding gas on welding performance and properties of duplex and superduplex stainless steel welds

Influenza del gas di protezione sul comportamento e le proprietà di giunti sa dati di acciai duplex e superduplex : Effect of shielding gas on welding performance and properties of duplex and superduplex stainless steel welds

Valiente Bermejo, María Asunción, 1972- (author): Högskolan Väst,Avdelningen för svetsteknologi (SV),PTW, Welding group

Karlsson, Leif, 1956- (author): Högskolan Väst,Avdelningen för svetsteknologi (SV),PTW

Svensson, Lars-Erik, 1951- (author): Högskolan Väst,Avdelningen för svetsteknologi (SV),Welding group, PTW

Hurtig, Kjell, 1960- (author): Högskolan Väst,Avdelningen för svetsteknologi (SV),PTW

Frodigh, M. (author): Sandvik Materials Technology, Sandviken, Svezia, Sweden

(creator_code:org_t)

Istituto Italiano della Saldatura, 2016
2016
English.
In: Rivista Italiana della Saldatura. - : Istituto Italiano della Saldatura. - 0035-6794. ; 68:5, s. 635-650

Related links:: http://www.iis.it/si...; show more...; https://urn.kb.se/re...; show less...

Abstract Subject headings

The influence of shielding gases on welding performance and on properties of duplex and superduplex stainless steel welds was studied. Using argon as the reference gas, helium, nitrogen and carbon dioxide were added and five mixtures evaluated. Bead-on-plate welds and circumferential pipe welds were produced using mechanised GMA welding in the downhand position. Welding performance, corrosion resistance, mechanical properties, microstructural features and weld imperfections were assessed and related to the shielding gas. Shielding gases containing 30% helium showed excellent results; whilst pure argon showed unstable arc and poor weld pool fluidity and Ar + 2% CO2resulted in underfill and porosity. Mixtures containing helium resulted in higher ductility welds and higher impact toughness values than welds produced with Ar + 2% CO2. Sound and balanced duplex microstructures free from intermetallics were found with suitable ferrite contents for all the shielding gases studied. All the duplex pipe welds passed the corrosion test regardless of the shielding gas used, and the best results in the corrosion test for superduplex pipe welds were found when using Ar + 30%He + 0.5% CO2+ 1.8% N2as shielding gas.

TEKNIK OCH TEKNOLOGIER -- Materialteknik -- Bearbetnings-, yt- och fogningsteknik (hsv//swe)
ENGINEERING AND TECHNOLOGY -- Materials Engineering -- Manufacturing, Surface and Joining Technology (hsv//eng)

Argon; Atmospheric corrosion; Carbon; Carbon dioxide; Corrosion; Corrosion resistance; Electric arc welding; Gas metal arc welding; Gases; Helium; Intermetallics; Laser beam welding; Mechanical properties; Microstructural evolution; Mixtures; Nitrogen; Shielding; Welding; Welds
Corrosion tests; Duplex microstructures; Duplex stainless steel; Ferrite content; GMA welding; Microstructural features; Shielding gas; Superduplex stainless steels
Stainless steel
Production Technology
Produktionsteknik
Manufacturing and materials engineering
Produktions- och materialteknik

By the author/editor: Valiente Bermejo ...; Karlsson, Leif, ...; Svensson, Lars-E ...; Hurtig, Kjell, 1 ...; Rasmuson, H.; Frodigh, M.; show more...; Bengtsson, P.; show less...

About the subject

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Materials Engine ...; and Manufacturing Su ...

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