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Infuence of Shielding Gas Flow Rate on Properties of Steel S960QL Welded Joint

Identifikátory výsledku

  • Kód výsledku v IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21220%2F20%3A00344503" target="_blank" >RIV/68407700:21220/20:00344503 - isvavai.cz</a>

  • Výsledek na webu

  • DOI - Digital Object Identifier

Alternativní jazyky

  • Jazyk výsledku

    angličtina

  • Název v původním jazyce

    Infuence of Shielding Gas Flow Rate on Properties of Steel S960QL Welded Joint

  • Popis výsledku v původním jazyce

    The experiment aimed on influence of shielding gas flow rate on properties of single V groove butt weld of high strength ultra-fine grained steel S960QL (XABO 960) and filler material G 89 6 M21 Mn4Ni2CrMo (X90) isdescribed in this article. The steel S960QL is sensitive to presence of hydrogen in material structure, in exceed of maximal recommended content (<5ml/100g) the cold cracking may take place. During the experiment specimen 1 with reduced flow rate 5 l.min-1 and specimen 2 with recommended flow rate 14 l.min-1 was welded. The active shielding gas Corgon with the 82 % Ar and 18 % CO2 ratio was used. Flow rate of shielding gas has a noticeable influence on properties of welded joint. Because of specimen 1 reduced flow rate the full penetration was not achieved, chemical composition evaluation of weld metal shows fewer deoxidizing elements (Si, Mn, Ti) and increased hydrogen contents (~18 ml/100g) as a result of chemical reaction between weld metal and air during welding. The increased hydrogen content, type of base metal and lack of penetration were the reasons of fracture of the specimen 1. Cold cracking was confirmed by hydrogen content measurement and by fracture surface evaluation by optical and electron microscopy. The porosity, fish eyes and cleavage facets typical for brittle fracture was found by microscopy. The high-quality weld with low content of hydrogen can be obtained with the recommended shielding gas flow rate, the flow rate adjustment is one of method how to avoid cold cracking of welds.

  • Název v anglickém jazyce

    Infuence of Shielding Gas Flow Rate on Properties of Steel S960QL Welded Joint

  • Popis výsledku anglicky

    The experiment aimed on influence of shielding gas flow rate on properties of single V groove butt weld of high strength ultra-fine grained steel S960QL (XABO 960) and filler material G 89 6 M21 Mn4Ni2CrMo (X90) isdescribed in this article. The steel S960QL is sensitive to presence of hydrogen in material structure, in exceed of maximal recommended content (<5ml/100g) the cold cracking may take place. During the experiment specimen 1 with reduced flow rate 5 l.min-1 and specimen 2 with recommended flow rate 14 l.min-1 was welded. The active shielding gas Corgon with the 82 % Ar and 18 % CO2 ratio was used. Flow rate of shielding gas has a noticeable influence on properties of welded joint. Because of specimen 1 reduced flow rate the full penetration was not achieved, chemical composition evaluation of weld metal shows fewer deoxidizing elements (Si, Mn, Ti) and increased hydrogen contents (~18 ml/100g) as a result of chemical reaction between weld metal and air during welding. The increased hydrogen content, type of base metal and lack of penetration were the reasons of fracture of the specimen 1. Cold cracking was confirmed by hydrogen content measurement and by fracture surface evaluation by optical and electron microscopy. The porosity, fish eyes and cleavage facets typical for brittle fracture was found by microscopy. The high-quality weld with low content of hydrogen can be obtained with the recommended shielding gas flow rate, the flow rate adjustment is one of method how to avoid cold cracking of welds.

Klasifikace

  • Druh

    D - Stať ve sborníku

  • CEP obor

  • OECD FORD obor

    20301 - Mechanical engineering

Návaznosti výsledku

  • Projekt

  • Návaznosti

    S - Specificky vyzkum na vysokych skolach

Ostatní

  • Rok uplatnění

    2020

  • Kód důvěrnosti údajů

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Údaje specifické pro druh výsledku

  • Název statě ve sborníku

    METAL 2020 - Conference Proceedings

  • ISBN

    978-80-87294-97-0

  • ISSN

  • e-ISSN

    2694-9296

  • Počet stran výsledku

    6

  • Strana od-do

    393-398

  • Název nakladatele

    TANGER

  • Místo vydání

    Ostrava

  • Místo konání akce

    Brno

  • Datum konání akce

    20. 5. 2020

  • Typ akce podle státní příslušnosti

    WRD - Celosvětová akce

  • Kód UT WoS článku