<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>1405-7743</journal-id>
<journal-title><![CDATA[Ingeniería, investigación y tecnología]]></journal-title>
<abbrev-journal-title><![CDATA[Ing. invest. y tecnol.]]></abbrev-journal-title>
<issn>1405-7743</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Facultad de Ingeniería]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-77432025000200004</article-id>
<article-id pub-id-type="doi">10.22201/fi.25940732e.2025.26.2.012</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Effect of multipass welding on the microstructure of superduplex stainless steel]]></article-title>
<article-title xml:lang="es"><![CDATA[Efecto de la soldadura multipasos sobre la microestructura de un acero inoxidable superdúplex]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Villalobos-Vera]]></surname>
<given-names><![CDATA[Doris Ivette]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mendoza-Bravo]]></surname>
<given-names><![CDATA[Ivan]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Valerio-Canales]]></surname>
<given-names><![CDATA[Gabriela]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Tecnológico Nacional de México Instituto Tecnológico de Veracruz Welding and Foundry Laboratory]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>México</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Tecnológico Nacional de México Instituto Tecnológico de Veracruz Welding and Foundry Laboratory]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>México</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Tecnológico Nacional de México Instituto Tecnológico de Veracruz Department of Metal-Mechanics]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2025</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2025</year>
</pub-date>
<volume>26</volume>
<numero>2</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-77432025000200004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-77432025000200004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-77432025000200004&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: This work studies the influence of thermal cycles on the microstructure of a 2507 superduplex stainless steel (2507 SDSS) after being multipass-welded using the GMAW process with ER 2209 filler metal and two shielding gasses (Ar and Ar-6 %N). To calculate the thermal cycles experienced during welding, the heat flow equation for a thin plate was used. All samples were analyzed by optical microscopy and scanning electron microscopy to identify phases. The results showed particles of sigma phase in both the heat affected zone (HAZ) and welding metal (WM) in the ferrite/austenite grain boundary and intragranular, resulting in the loss of the microstructural balance of the superduplex stainless steel.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: Este trabajo estudia la influencia de los ciclos térmicos sobre la microestructura del acero inoxidable superdúplex del tipo 2507 des- pués de haber sido soldado mediante el proceso GMAW con el metal de aporte ER 2209 y dos tipos de gas de protección (Ar y Ar-6 %N). Para calcular los ciclos térmicos experimentados durante la soldadura multipasos, se utilizó la ecuación de flujo de calor para una placa delgada. Las muestras fueron analizadas mediante microscopía óptica y microscopía electrónica de barrido para identificar las fases. Los resultados mostraron partículas de fase sigma en la zona afectada térmicamente y en el metal de soldadura en los lími0tes de grano ferrita/austenita y de forma intragranular, resultando en la pérdida del balance microestructural del acero inoxidable superdúplex.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Duplex stainless steel]]></kwd>
<kwd lng="en"><![CDATA[microstructure]]></kwd>
<kwd lng="en"><![CDATA[thermal cycles]]></kwd>
<kwd lng="en"><![CDATA[GMAW]]></kwd>
<kwd lng="en"><![CDATA[sigma phase]]></kwd>
<kwd lng="es"><![CDATA[Acero inoxidable superdúplex]]></kwd>
<kwd lng="es"><![CDATA[microestructura]]></kwd>
<kwd lng="es"><![CDATA[ciclos térmicos]]></kwd>
<kwd lng="es"><![CDATA[GMAW]]></kwd>
<kwd lng="es"><![CDATA[fase sigma]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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