{"id":10539,"date":"2021-12-31T06:15:23","date_gmt":"2021-12-31T06:15:23","guid":{"rendered":"https:\/\/zecovalve.com\/brief-introduction-to-post-weld-heat-treatment-pwht-zeco-api-602-forged-valve-manufacturer.html"},"modified":"2022-08-23T06:09:44","modified_gmt":"2022-08-23T06:09:44","slug":"brief-introduction-to-post-weld-heat-treatment-pwht-zeco-api-602-forged-valve-manufacturer","status":"publish","type":"post","link":"https:\/\/zecovalve.com\/es\/brief-introduction-to-post-weld-heat-treatment-pwht-zeco-api-602-forged-valve-manufacturer.html","title":{"rendered":"Tratamiento t\u00e9rmico posterior a la soldadura \u2013 PWHT"},"content":{"rendered":"<p><span style=\"font-size: 16px;\"><strong><mark style=\"background-color:var(--base)\" class=\"has-inline-color has-contrast-2-color\"><a href=\"https:\/\/zecovalve.com\/es\/producto\/sw-gate-valve\/\" target=\"_blank\" rel=\"noreferrer noopener\">V\u00e1lvulas de compuerta API 602<\/a><\/mark>Casquete atornillado, v\u00e1stago ascendente, soldadura por encastre con espigas de 100 mm de longitud soldadas en ambos extremos, PWHT<\/strong>.<\/span><\/p>\n\n\n\n<p><span style=\"font-size: 16px;\">\u00bfHas o\u00eddo hablar de PWHT? \u00bfQu\u00e9 es PWHT? <\/span><\/p>\n\n\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-overview-of-post-weld-heat-treatment-pwht\">Visi\u00f3n general del tratamiento t\u00e9rmico posterior a la soldadura (PWHT)<\/h2>\n\n\n\n<p>La soldadura es una parte esencial del funcionamiento y el mantenimiento de los activos en las industrias petroleras (upstream, midstream, downstream) y de procesamiento qu\u00edmico. Aunque tiene muchas aplicaciones \u00fatiles, el proceso de soldadura puede debilitar inadvertidamente el equipo al impartir tensiones residuales en un material, lo que conduce a la reducci\u00f3n de las propiedades del material.<\/p>\n\n\n\n<p>Para garantizar que la resistencia del material de una pieza se mantiene despu\u00e9s de la soldadura, se realiza regularmente un proceso conocido como tratamiento t\u00e9rmico posterior a la soldadura (PWHT). El PWHT puede utilizarse para reducir las tensiones residuales, como m\u00e9todo de control de la dureza o incluso para aumentar la resistencia del material.<\/p>\n\n\n\n<p>Si la PWHT se realiza de forma incorrecta, o se descuida por completo, las tensiones residuales pueden combinarse con las tensiones de carga para superar las limitaciones de dise\u00f1o de un material. Esto puede provocar fallos de soldadura, un mayor potencial de agrietamiento y una mayor susceptibilidad a la fractura fr\u00e1gil.<\/p>\n\n\n\n<p class=\"has-text-align-center\"><span style=\"font-size: 16px;\"><img decoding=\"async\" title=\"Breve introducci\u00f3n al tratamiento t\u00e9rmico posterior a la soldadura (PWHT)\" style=\"width: 50%;\" src=\"https:\/\/zecovalve.com\/wp-content\/uploads\/2021\/12\/20211231061522-61ce9ffa8f9c9.jpg\" alt=\"Breve introducci\u00f3n al tratamiento t\u00e9rmico posterior a la soldadura (PWHT)\"><\/span><br>&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-pwht-encompasses-many-different-types-of-potential-treatments\">La PWHT abarca muchos tipos diferentes de tratamientos potenciales: <\/h2>\n\n\n\n<p>Dos de los tipos m\u00e1s comunes son el postcalentamiento y el alivio del estr\u00e9s:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-post-heating\">Post Calefacci\u00f3n:<\/h3>\n\n\n\n<p>El agrietamiento inducido por hidr\u00f3geno (HIC) suele producirse cuando altos niveles de hidr\u00f3geno ambiental penetran en un material durante la soldadura. Calentando el material despu\u00e9s de la soldadura, es posible difundir el hidr\u00f3geno de la zona soldada, evitando as\u00ed el HIC. Este proceso se conoce como postcalentamiento y debe iniciarse inmediatamente despu\u00e9s de finalizar la soldadura. En lugar de dejar que se enfr\u00ede, el material debe calentarse a una temperatura determinada en funci\u00f3n del tipo y el grosor del material. Debe mantenerse a esta temperatura durante varias horas en funci\u00f3n del grosor del material.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-stress-relieving\">Alivia el estr\u00e9s:<\/h3>\n\n\n\n<p>Una vez finalizado, el proceso de soldadura puede dejar un gran n\u00famero de tensiones residuales en un material, lo que puede aumentar el potencial de corrosi\u00f3n bajo tensi\u00f3n y de agrietamiento inducido por hidr\u00f3geno. La PWHT puede utilizarse para liberar estas tensiones residuales y reducir este potencial. Este proceso consiste en calentar el material a una temperatura espec\u00edfica y enfriarlo gradualmente.<\/p>\n\n\n\n<p>La conveniencia o no de someter un material a PWHT depende de varios factores, como su sistema de aleaci\u00f3n o si ha sido sometido a tratamiento t\u00e9rmico anteriormente. Algunos materiales pueden resultar da\u00f1ados por el PWHT, mientras que otros casi siempre lo requieren.<\/p>\n\n\n\n<p>En general, cuanto mayor es el contenido de carbono de un material, m\u00e1s probable es que necesite PWHT despu\u00e9s de realizar las actividades de soldadura. Del mismo modo, cuanto mayor sea el contenido de aleaci\u00f3n y el espesor de la secci\u00f3n transversal, mayor ser\u00e1 la probabilidad de que el material necesite PWHT.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-when-pwht-is-required-for-carbon-steel\">\u00bfCu\u00e1ndo se requiere PWHT para el acero al carbono?<\/h2>\n\n\n\n<p>El tratamiento t\u00e9rmico posterior a la soldadura o PWHT del acero al carbono debe realizarse despu\u00e9s de cada soldadura para garantizar que se mantiene la resistencia del material de la pieza. Los criterios exactos para el PWHT del acero al carbono se mencionan en el c\u00f3digo ASME BPVC. El PWHT garantiza la reducci\u00f3n de las tensiones residuales, el control de la dureza del material y la mejora de la resistencia mec\u00e1nica.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-advantages-of-post-weld-heat-treatment-purpose-of-pwht\">Ventajas del tratamiento t\u00e9rmico posterior a la soldadura | Finalidad del PWHT<\/h2>\n\n\n\n<p>Si la PWHT se descuida o se realiza incorrectamente, las tensiones residuales pueden combinarse con las tensiones de carga de servicio. El valor puede exceder las limitaciones de dise\u00f1o de un material, provocando fallos de soldadura, un mayor potencial de agrietamiento y una mayor susceptibilidad a la fractura fr\u00e1gil. A continuaci\u00f3n se enumeran otras ventajas de la PWHT:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Estructura metal\u00fargica mejorada<\/li><li>Mejora de la ductilidad del material<\/li><li>Menor riesgo de fractura fr\u00e1gil al aumentar la ductilidad<\/li><li>Tensi\u00f3n t\u00e9rmica relajada debida a la redistribuci\u00f3n de las tensiones residuales.<\/li><li>Metal templado<\/li><li>Eliminaci\u00f3n del hidr\u00f3geno difusible, lo que ayuda a prevenir el agrietamiento inducido por hidr\u00f3geno (HIC).<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-pwht-method-and-equipment\">M\u00e9todo y equipo PWHT<\/h2>\n\n\n\n<p>El tratamiento t\u00e9rmico local posterior a la soldadura de las uniones soldadas de los tubos se realizar\u00e1 por el m\u00e9todo de resistencia el\u00e9ctrica una vez finalizadas todas las operaciones de soldadura o reparaci\u00f3n.<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>\u00a0El calentador de resistencia est\u00e1 el\u00e9ctrica y t\u00e9rmicamente autoaislado y se construye a medida para cada tuber\u00eda individual.<\/li><li>Las tensiones aplicadas a trav\u00e9s de las bobinas son de 220 o 380 voltios CA, en funci\u00f3n de los requisitos de potencia.<\/li><li>\u00a0El panel de control de potencia del tratamiento t\u00e9rmico posterior a la soldadura se compone de:<\/li><li>Un indicador y registrador de controlador de temperatura de tipo digital.<\/li><li>Dispositivo potenci\u00f3metro que controla el porcentaje de potencia de entrada a las bobinas.<\/li><li>Un interruptor de encendido y apagado de las luces indicadoras, de entrada, y terminales de salida para la alimentaci\u00f3n y la conexi\u00f3n del termopar.<\/li><li>Contactores de potencia el\u00e9ctrica de la clasificaci\u00f3n adecuada.<\/li><li>Cada panel alimentar\u00e1 una \u00fanica estaci\u00f3n de calefacci\u00f3n y, por lo tanto, para cada operaci\u00f3n de calefacci\u00f3n se necesitar\u00e1 un panel. Las velocidades de calefacci\u00f3n y refrigeraci\u00f3n se ajustan mediante la selecci\u00f3n manual del porcentaje de potencia de entrada por medio de potenci\u00f3metros.<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-requirements-for-post-weld-heat-treatment-or-pwht\">Requisitos para el tratamiento t\u00e9rmico posterior a la soldadura o PWHT<\/h2>\n\n\n\n<p>Antes de solicitar los requisitos detallados de PWHT y la exenci\u00f3n de estos apartados, se realizar\u00e1n calificaciones satisfactorias del procedimiento de soldadura de la especificaci\u00f3n de los procedimientos de soldadura que se utilizar\u00e1n de acuerdo con todas las variables esenciales de la SECCI\u00d3N IX de ASME, incluidas las condiciones del tratamiento t\u00e9rmico posterior a la soldadura y otras restricciones que se enumeran a continuaci\u00f3n.<\/p>\n\n\n\n<p>Al realizar el tratamiento t\u00e9rmico local postsoldadura, la t\u00e9cnica de aplicaci\u00f3n del calor debe garantizar la obtenci\u00f3n de una temperatura uniforme en todos los puntos de la porci\u00f3n que se est\u00e1 tratando t\u00e9rmicamente. Se velar\u00e1 por que la anchura de la banda calentada a ambos lados del borde de la soldadura no sea inferior a cuatro (4) veces el espesor del tubo o 2\u2033, de ambos el mayor.<\/p>\n\n\n\n<p>Durante todo el ciclo de tratamiento t\u00e9rmico posterior a la soldadura, la parte situada fuera de la banda calentada se envolver\u00e1 convenientemente con aislamiento para evitar cualquier gradiente de temperatura perjudicial en la superficie expuesta del tubo. Para ello, la temperatura en la superficie expuesta del tubo no debe superar los 400\u00b0c.<\/p>\n\n\n\n<p>Las v\u00e1lvulas, instrumentos y otros elementos especiales con extremos de soldadura deber\u00e1n protegerse, debido al riesgo de da\u00f1os durante el tratamiento t\u00e9rmico posterior a la soldadura.<\/p>\n\n\n\n<p>No se realizar\u00e1 ninguna soldadura despu\u00e9s de la PWHT.<\/p>\n\n\n\n<p>Se utilizar\u00e1n registradores autom\u00e1ticos de temperatura debidamente calibrados. La tabla de calibraci\u00f3n de cada registrador se presentar\u00e1 al propietario antes de iniciar las operaciones de tratamiento t\u00e9rmico y se obtendr\u00e1 su aprobaci\u00f3n. El equipo de registro se calibrar\u00e1 al menos una vez cada 12 meses. Asimismo, el equipo de instrumentos (potenci\u00f3metro) que se utilice para la calibraci\u00f3n de los registradores deber\u00e1 estar respaldado por un certificado relacionado.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-preparation-and-attachment-of-thermocouple-for-pwht\">Preparaci\u00f3n y fijaci\u00f3n del termopar para PWHT<\/h2>\n\n\n\n<p>Una vez realizada la inspecci\u00f3n visual y eliminados los defectos superficiales y las soldaduras por puntos temporales (si las hubiera), se fijar\u00e1 un n\u00famero adecuado de termopares (en funci\u00f3n del di\u00e1metro de los tubos) a la tuber\u00eda directamente y a intervalos iguales a lo largo de la periferia de la junta del tubo. El n\u00famero m\u00ednimo de termopares fijados por junta ser\u00e1 de 1 para di\u00e1metros de hasta 3\u2033, 2 para di\u00e1metros de hasta 6\u2033 y 3 para di\u00e1metros de hasta 10\u2033y 4 para di\u00e1metros de hasta 12\u2033 y superiores. Sin embargo, el n\u00famero m\u00ednimo requerido de termopares que deben fijarse puede aumentarse si se considera necesario.<\/p>\n\n\n\n<p>Los termopares se colocar\u00e1n en la junta y en contacto firme con la tuber\u00eda lo m\u00e1s cerca posible de la zona de soldadura. Los termopares deber\u00e1n soldarse por puntos directamente a la junta o banda calefactora de forma conjunta siempre que tengan una cola del mismo material y se utilice un alambre o electrodo de relleno homologado de di\u00e1metro no superior a 2,5 mm para la soldadura por puntos.<\/p>\n\n\n\n<p>Para evitar lecturas incorrectas de la temperatura debidas a la radiaci\u00f3n directa sobre los termopares, \u00e9stos se proteger\u00e1n con un revestimiento de fibra cer\u00e1mica o cualquier otro material aislante adecuado.<\/p>\n\n\n\n<p>Las resistencias calefactoras se colocar\u00e1n sobre los termopares acoplados a lo largo de toda la banda calefactora y se aislar\u00e1n como se muestra en la Fig. 1.<\/p>\n\n\n\n<p>Los materiales aislantes ser\u00e1n lana mineral\/lana de vidrio que puedan superar la temperatura empleada. El espesor m\u00ednimo del aislamiento ser\u00e1 de 50 mm. Para mantener el material aislante en posici\u00f3n, se envolver\u00e1 y atar\u00e1 una malla met\u00e1lica o se atar\u00e1 por otros medios adecuados.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-pwht-temperature-time-record\">Temperatura PWHT, registro de tiempo &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<\/h2>\n\n\n\n<p>La temperatura y el tiempo del tratamiento t\u00e9rmico posterior a la soldadura y sus velocidades de calentamiento y enfriamiento se registrar\u00e1n autom\u00e1ticamente y presentar\u00e1n la temperatura real de la zona soldada. Cada termopar se conectar\u00e1 al instrumento de control y registro para cada uni\u00f3n tratada.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-heating-holding-and-cooling-in-pwht\">Calentamiento, mantenimiento y enfriamiento en PWHT<\/h2>\n\n\n\n<p>Se registrar\u00e1 la temperatura de calentamiento por encima de 300\u00b0c y la velocidad de calentamiento y enfriamiento no ser\u00e1 superior a la especificada en la EPS y las normas correspondientes, pero en ning\u00fan caso superior a 200\u00b0c\/h, y la diferencia entre las temperaturas medidas por varios termopares estar\u00e1 dentro del intervalo especificado.<\/p>\n\n\n\n<p>La temperatura de la media de tratamiento t\u00e9rmico y el tiempo de mantenimiento ser\u00e1n los especificados en las especificaciones del procedimiento de soldadura correspondiente. Para facilitar la consulta, en la siguiente tabla se indican los valores correspondientes a los distintos tipos de acero.<\/p>\n\n\n\n<p>El enfriamiento hasta 300\u00b0C ser\u00e1 controlado. Por debajo de esa temperatura, el enfriamiento hasta la temperatura ambiente tendr\u00e1 lugar sin control bajo el revestimiento aislante.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-few-important-notes-related-to-pwht\">Algunas notas importantes relacionadas con la PWHT<\/h2>\n\n\n\n<p>La operaci\u00f3n de PWHT deber\u00e1 ser realizada \u00fanicamente por personal capacitado con experiencia similar y aprobado por el propietario.<\/p>\n\n\n\n<p>Durante el PWHT, las juntas se proteger\u00e1n de la lluvia y el viento mediante una cubierta adecuada y un parabrisas.<\/p>\n\n\n\n<p>Se realizar\u00e1n ensayos de dureza despu\u00e9s del PWHT para determinar si el tratamiento t\u00e9rmico se ha realizado eficazmente. Normalmente, para el acero al carbono, la dureza Brinnel m\u00e1xima es de 200 HB.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-safety-precautions-during-pwht\">Precauciones de seguridad durante la PWHT<\/h2>\n\n\n\n<p>Se tomar\u00e1n las siguientes precauciones de seguridad durante la PWHT:<\/p>\n\n\n\n<p>Los equipos y paneles deber\u00e1n estar debidamente conectados a tierra.<\/p>\n\n\n\n<p>Los t\u00e9cnicos electricistas trabajar\u00e1n con ropa de seguridad adecuada, como guantes de goma, zapatos, etc.<\/p>\n\n\n\n<p>S\u00f3lo trabajar\u00e1 un electricista certificado.<\/p>\n\n\n\n<p>Las uniones bajo PWHT estar\u00e1n bien acordonadas con cinta roja\/luz roja e indicaci\u00f3n de peligro para evitar que personas desconocidas entren en contacto con conexiones el\u00e9ctricas de alta tensi\u00f3n.<\/p>\n\n\n\n<p>Se realizar\u00e1 una plataforma adecuada para las juntas in situ para evitar la ca\u00edda de una persona.<\/p>\n\n\n\n<p><span style=\"font-size: 16px;\">Bas\u00e1ndose en lo anterior, PWHT es la <\/span>proceso cr\u00edtico necesario para el material soldado, al que se debe prestar suficiente atenci\u00f3n <span style=\"font-size: 16px;\">durante la producci\u00f3n.\u00a0<\/span><\/p>\n\n\n\n<!-- Andy:h-related-tags -->\n<h2 id=\"h-related-tags\">Etiquetas relacionadas :<\/h2>\n<!-- \/Andy:h-related-tags -->\n\n\n\n<div class=\"re_main\">\n<a href=\"https:\/\/zecovalve.com\/es\/\">V\u00e1lvula ZECO<\/a>\n\n<\/div>\n\n\n\n<div class=\"re_main\">\n<a href=\"https:\/\/zecovalve.com\/es\/introduction-of-epdm-nbr-butterfly-valve-seat-industrial-valve-information-news-zeco-valve.html\/\">V\u00e1lvula de mariposa de NBR<\/a>\n\n<\/div>\n\n\n\n<div class=\"re_main\">\n<a href=\"https:\/\/zecovalve.com\/es\/difference-between-gate-valves-and-ball-valves.html\/\">V\u00e1lvula de compuerta frente a v\u00e1lvula de bola<\/a>\n\n<\/div>\n\n\n\n<div class=\"re_main\">\n<a href=\"https:\/\/zecovalve.com\/es\/advantages-and-disadvantages-of-globe-valves.html\/\">\u00bfQu\u00e9 es una v\u00e1lvula de globo?<\/a>\n\n<\/div>\n\n\n\n<div class=\"re_main\">\n<a href=\"https:\/\/zecovalve.com\/es\/gate-valve-problems.html\/\">Reparaci\u00f3n de v\u00e1lvulas de compuerta<\/a>\n\n<\/div>\n\n\n\n<div class=\"re_main\">\n<a href=\"https:\/\/zecovalve.com\/es\/what-is-an-axial-flow-silent-check-valve.html\/\">Qu\u00e9 es una v\u00e1lvula antirretorno axial<\/a>\n\n<\/div>\n\n\n\n\n<div class=\"re_main\">\n<a href=\"https:\/\/zecovalve.com\/es\/producto\/manual-gate-valve\/\">v\u00e1lvula de compuerta de accionamiento manual Fabricantes<\/a>\n\n<\/div>\n\n\n\n<div class=\"re_main\">\n<a href=\"https:\/\/zecovalve.com\/es\/the-function-of-globe-valve-in-pipeline-system.html\/\">\u00bfQu\u00e9 son las v\u00e1lvulas de globo?<\/a>\n\n<\/div>\n\n\n\n<p>Diez art\u00edculos antes y despu\u00e9s<\/p>\n\n\n\n<p><a href=\"https:\/\/zecovalve.com\/es\/the-main-difference-between-forged-steel-and-cast-steel-ball-valves-zeco-api-602-forged-valve-manufacturer.html\/\">La principal diferencia entre las v\u00e1lvulas de bola de acero forjado y de acero fundido - 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Zeco | API 602 fabricante de v\u00e1lvulas forjadas<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/zecovalve.com\/es\/zeco-established-its-integration-center-in-lishui-this-october-zeco-api-602-forged-valve-manufacturer.html\/\">Zeco estableci\u00f3 su Centro de Integraci\u00f3n en Lishui este mes de octubre - Zeco | Fabricante de v\u00e1lvulas forjadas API 602<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>V\u00e1lvulas de compuerta API 602, cap\u00f3 atornillado, v\u00e1stago ascendente, enchufe soldado con niples de extremo liso de 100 mm de largo soldados en ambos extremos, PWHT. Entonces \u2026 <a title=\"Tratamiento t\u00e9rmico posterior a la soldadura - PWHT\" class=\"read-more\" href=\"https:\/\/zecovalve.com\/es\/brief-introduction-to-post-weld-heat-treatment-pwht-zeco-api-602-forged-valve-manufacturer.html\" aria-label=\"M\u00e1s en Tratamiento T\u00e9rmico Post-Soldadura - PWHT\">Leer m\u00e1s<\/a><\/p>","protected":false},"author":2,"featured_media":10538,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_generate-full-width-content":"","kt_blocks_editor_width":"","footnotes":""},"categories":[1],"tags":[1951,2834,1946,1952,1949,1317,1943,1953,1955,1954,1950],"class_list":["post-10539","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized","tag-api-602","tag-fish-plate-welding","tag-flash-weld","tag-post-weld-heat-treat","tag-post-weld-heat-treatment","tag-pwht","tag-surfacing-weld","tag-weld-heat","tag-what-is-post-weld-heat-treatment","tag-what-is-pwht","tag-what-is-the-purpose-of-post-weld-heat-treatment","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-50"],"featured_image_src_large":["https:\/\/zecovalve.com\/wp-content\/uploads\/2021\/12\/20211231061522-61ce9ffa8f9c9.jpg",259,194,false],"author_info":{"display_name":"Jerry","author_link":"https:\/\/zecovalve.com\/es\/author\/jerry"},"comment_info":0,"category_info":[{"term_id":1,"name":"Uncategorized","slug":"uncategorized","term_group":0,"term_taxonomy_id":1,"taxonomy":"category","description":"","parent":0,"count":452,"filter":"raw","cat_ID":1,"category_count":452,"category_description":"","cat_name":"Uncategorized","category_nicename":"uncategorized","category_parent":0}],"tag_info":[{"term_id":1951,"name":"api 602","slug":"api-602","term_group":0,"term_taxonomy_id":1951,"taxonomy":"post_tag","description":"","parent":0,"count":4,"filter":"raw"},{"term_id":2834,"name":"Fish Plate Welding","slug":"fish-plate-welding","term_group":0,"term_taxonomy_id":2834,"taxonomy":"post_tag","description":"<!-- wp:kadence\/tableofcontents {\"uniqueID\":\"_5f133f-32\"} \/-->\r\n\r\n<!-- wp:generateblocks\/button-container {\"uniqueId\":\"6d8495a3\",\"isDynamic\":true,\"blockVersion\":2} -->\r\n<!-- wp:generateblocks\/button {\"uniqueId\":\"3d442e11\",\"hasUrl\":true,\"target\":true,\"backgroundColor\":\"#0366d6\",\"textColor\":\"#ffffff\",\"backgroundColorHover\":\"#222222\",\"textColorHover\":\"#ffffff\",\"paddingTop\":\"15\",\"paddingRight\":\"20\",\"paddingBottom\":\"15\",\"paddingLeft\":\"20\"} -->\r\n<a class=\"gb-button gb-button-3d442e11 gb-button-text\" href=\"mailto:commercial@zecovalve.com\" target=\"_blank\" rel=\"noopener noreferrer\"><strong>GET FISH PLATE WELDING INFORMATION<\/strong><\/a>\r\n<!-- \/wp:generateblocks\/button -->\r\n<!-- \/wp:generateblocks\/button-container -->\r\n\r\n<!-- wp:heading -->\r\n<h2 id=\"h-what-is-fish-plate-welding\">What is Fish Plate Welding?<\/h2>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nA fishplate weld is a weld joint used to join two metal plates together. The fishplate weld is a type of fillet weld and is commonly used to join two structural members or rails to give strength to an existing weld underneath. The fishplate weld is created by welding two metal plates together at their edges.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:heading -->\r\n<h2>Applications of Fish Plate Welding<\/h2>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nFish plates are used widely in trucks to join the truck frame to give additional strength (by reinforcing the frame structure) to the truck frame. But instead of bolting, the fishplate is welded in a truck frame. Fishplate is also used to repairing of cracks in the truck frame.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:heading -->\r\n<h2>What is the Function of Fish Plate?<\/h2>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nFunctions of Fish Plates are :\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:list -->\r\n<ul>\r\n \t<li>a) To join the rail ends to maintain the line and level of the top table and gauge face of the rail ends and to resist the impact and prevent the deflection of the rail joint with the help of closely spaced sleeper support.<\/li>\r\n \t<li>b) To transfer the load of the wheels from one rail to the other.<\/li>\r\n<\/ul>\r\n<!-- \/wp:list -->","parent":0,"count":3,"filter":"raw"},{"term_id":1946,"name":"Flash Weld","slug":"flash-weld","term_group":0,"term_taxonomy_id":1946,"taxonomy":"post_tag","description":"<!-- wp:kadence\/tableofcontents {\"uniqueID\":\"_44f632-3f\"} \/-->\r\n\r\n<!-- wp:heading -->\r\n<h2>What is Flash Welding?<\/h2>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nFlash welding, also called flash butt welding, is a resistance welding process, in which the ends of the workpieces are pressed together and a heavy electric current is passed through the joint during the welding process.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nIn flash welding, the electrical current is applied to the workpieces before they are brought together so that when they meet arcing (or flashing) takes place.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:generateblocks\/button-container {\"uniqueId\":\"6d8495a3\",\"isDynamic\":true,\"blockVersion\":2} -->\r\n<!-- wp:generateblocks\/button {\"uniqueId\":\"3d442e11\",\"hasUrl\":true,\"target\":true,\"backgroundColor\":\"#0366d6\",\"textColor\":\"#ffffff\",\"backgroundColorHover\":\"#222222\",\"textColorHover\":\"#ffffff\",\"paddingTop\":\"15\",\"paddingRight\":\"20\",\"paddingBottom\":\"15\",\"paddingLeft\":\"20\"} -->\r\n<a class=\"gb-button gb-button-3d442e11 gb-button-text\" href=\"mailto:commercial@zecovalve.com\" target=\"_blank\" rel=\"noopener noreferrer\"><strong>GET FLASH WELD INFORMATION<\/strong><\/a>\r\n<!-- \/wp:generateblocks\/button -->\r\n<!-- \/wp:generateblocks\/button-container -->\r\n\r\n<!-- wp:heading -->\r\n<h2>Parts of Flash Welding<\/h2>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nThe main parts of the flash welding process are described below \u2212\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:list -->\r\n<ul>\r\n \t<li>Power Supply \u2013 An AC power supply is used to provide power for flash welding or flash butt welding.<\/li>\r\n \t<li>Welding Transformer \u2013 A welding transformer is used for changing the current and voltage for the welding process.<\/li>\r\n \t<li>Clamps \u2013 In the flash welding process, two clamps are used viz. stationary clamp and movable clamp. The stationary clamp remains in a fixed position while the movable clamp moves about its axis. The metal workpieces are held by these clamps.<\/li>\r\n<\/ul>\r\n<!-- \/wp:list -->\r\n\r\n<!-- wp:heading -->\r\n<h2>Flash Welding Process<\/h2>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nTo perform flash welding, technicians will begin by clamping the ends of two pieces in electrode\/clamps and hold the ends close to each other. The power is initiated and an arc is formed across the gap. Then the parts are brought together with force.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nThe arc continues to heat the two ends as they are pushed together to form a fused joint. During this process flash and expelled material is generated, which is why it is called \u201cflash welding.\u201d This continues for a brief period until a sound joint has been formed then the current is stopped.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nAfterward, the welders will hold the two pieces together until the weld cools and solidifies. Excess flash must be removed and the weld inspected for any defects.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:heading -->\r\n<h2>Advantages Of Flash Welding<\/h2>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nBelow are some of the biggest advantages to flash welding:\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:list {\"ordered\":true} -->\r\n<ol>\r\n \t<li>It\u2019s An Efficient Way to Join Various Metal Components Together\r\nFlash welding gives welders the ability to put complex steel, aluminum, nickel, and titanium metals of various shapes and sizes together. Due to the unique complexities of these metals and shapes, other welding methods are not useful.<\/li>\r\n \t<li>Generates High-Quality Products\r\nFlash welding is a resistance welding technique that generates high-quality welds. The force of the weld allows contaminants to be squeezed out during the process. This means that welders can have an easier time connecting metal parts without worrying about solidification cracking and porosity, which are common defects in other welding techniques.<\/li>\r\n \t<li>It Can Be Useful in a Variety of Applications\r\nFlash welding is a versatile process applicable in a wide range of manufacturing operations. In addition to the automotive and aerospace industries, it's commonly used in the construction, metal fabrication, and shipbuilding industries.<\/li>\r\n<\/ol>\r\n<!-- \/wp:list -->","parent":0,"count":3,"filter":"raw"},{"term_id":1952,"name":"post weld heat treat","slug":"post-weld-heat-treat","term_group":0,"term_taxonomy_id":1952,"taxonomy":"post_tag","description":"","parent":0,"count":1,"filter":"raw"},{"term_id":1949,"name":"post weld heat treatment","slug":"post-weld-heat-treatment","term_group":0,"term_taxonomy_id":1949,"taxonomy":"post_tag","description":"","parent":0,"count":1,"filter":"raw"},{"term_id":1317,"name":"pwht","slug":"pwht","term_group":0,"term_taxonomy_id":1317,"taxonomy":"post_tag","description":"","parent":0,"count":1,"filter":"raw"},{"term_id":1943,"name":"Surfacing Weld","slug":"surfacing-weld","term_group":0,"term_taxonomy_id":1943,"taxonomy":"post_tag","description":"<!-- wp:kadence\/tableofcontents {\"uniqueID\":\"_de8f7d-a5\"} \/-->\r\n\r\n<!-- wp:heading -->\r\n<h2 id=\"h-what-is-surfacing-weld\">What is Surfacing Weld?<\/h2>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nSurfacing welds are welds that you use on surfaces for the purpose of replacement.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nSurfacing welding performed on a part of a construction equipment\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nUsually, you\u2019ll perform it on surfaces that have been worn out by time, environment, or specific situations.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:generateblocks\/button-container {\"uniqueId\":\"6d8495a3\",\"isDynamic\":true,\"blockVersion\":2} -->\r\n<!-- wp:generateblocks\/button {\"uniqueId\":\"3d442e11\",\"hasUrl\":true,\"target\":true,\"backgroundColor\":\"#0366d6\",\"textColor\":\"#ffffff\",\"backgroundColorHover\":\"#222222\",\"textColorHover\":\"#ffffff\",\"paddingTop\":\"15\",\"paddingRight\":\"20\",\"paddingBottom\":\"15\",\"paddingLeft\":\"20\"} -->\r\n<a class=\"gb-button gb-button-3d442e11 gb-button-text\" href=\"https:\/\/zecovalve.com\/contact\" target=\"_blank\" rel=\"noopener noreferrer\"><strong>GET SURFACING WELD INFORMATION<\/strong><\/a>\r\n<!-- \/wp:generateblocks\/button -->\r\n<!-- \/wp:generateblocks\/button-container -->\r\n\r\n<!-- wp:heading -->\r\n<h2>Here is information on Hard Surfacing Welding<\/h2>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nIn the list below we will list a few types of surfacing welding types\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nHard Surfacing (or surface welding) has somehow become a trade secret. It\u2019s an incredibly useful process buried in a mountain of complicated details, surrounded by a circus of welding elite all chanting \u201cyou\u2019re doing it wrong.\u201d We\u2019ll no more, friends. We\u2019re giving you a place to start with our basic guide to the hard surfacing.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nWhat is hard surfacing? Simply put, it\u2019s literally just welding a reinforced layer to a piece of metal. Generally, surface welding is done on metal surfaces that tend to wear down quicker. We\u2019re talking lawn mower blades, front-end loader buckets, snowmobile skags, or Julia Robert\u2019s toothbrush.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nHardfacing is a metalworking process where harder or tougher material is applied to a base metal. It is welded to the base material, and generally takes the form of specialized electrodes for arc welding or filler rod for oxyacetylene and gas tungsten arc welding (TIG) welding. Powder metal alloys are used in (PTA) also called powder plasma welding and thermal spray processes like high-velocity oxygen fuel coating (HVOF), plasma spray, spray, fuse, etc.SAW, FCAW, and MIG \/ MAG use continuously fed wire varying in diameter depending on the process and the current Strip cladding process uses strips from 50 mm wide to 125 mm with a thickness of 0.5mm. Open arc welding uses continuously fed tubular electrodes which may or may not contain flux.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:heading -->\r\n<h2>Applications of Surfacing Weld<\/h2>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nIn various industrial fields surfacing weld is widely used. The industrial fields are listed below,\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:list -->\r\n<ul>\r\n \t<li>Farming industrial fields<\/li>\r\n \t<li>Coal industrial fields and Mining industrial fields<\/li>\r\n \t<li>Chemical sector industrial fields<\/li>\r\n \t<li>Manufacturing industrial fields<\/li>\r\n \t<li>Petrochemical industrial fields<\/li>\r\n \t<li>Shipbuilding industrial fields<\/li>\r\n \t<li>Structural industrial fields and construction industrial fields<\/li>\r\n \t<li>Shipyard industrial fields<\/li>\r\n<\/ul>\r\n<!-- \/wp:list -->\r\n\r\n<!-- wp:block {\"ref\":15781} \/-->\r\n\r\n<!-- wp:block {\"ref\":15788} \/-->\r\n\r\n<!-- wp:block {\"ref\":26543} \/-->\r\n\r\n<!-- wp:block {\"ref\":20713} \/-->\r\n\r\n<!-- wp:block {\"ref\":20648} \/-->\r\n\r\n<!-- wp:block {\"ref\":26567} \/-->\r\n\r\n<!-- wp:block {\"ref\":26606} \/-->\r\n\r\n<!-- wp:block {\"ref\":26616} \/-->","parent":0,"count":3,"filter":"raw"},{"term_id":1953,"name":"weld heat","slug":"weld-heat","term_group":0,"term_taxonomy_id":1953,"taxonomy":"post_tag","description":"","parent":0,"count":1,"filter":"raw"},{"term_id":1955,"name":"what is post weld heat treatment","slug":"what-is-post-weld-heat-treatment","term_group":0,"term_taxonomy_id":1955,"taxonomy":"post_tag","description":"","parent":0,"count":1,"filter":"raw"},{"term_id":1954,"name":"what is pwht","slug":"what-is-pwht","term_group":0,"term_taxonomy_id":1954,"taxonomy":"post_tag","description":"","parent":0,"count":1,"filter":"raw"},{"term_id":1950,"name":"what is the purpose of post weld heat treatment","slug":"what-is-the-purpose-of-post-weld-heat-treatment","term_group":0,"term_taxonomy_id":1950,"taxonomy":"post_tag","description":"","parent":0,"count":1,"filter":"raw"}],"taxonomy_info":{"category":[{"value":1,"label":"Uncategorized"}],"post_tag":[{"value":1951,"label":"api 602"},{"value":2834,"label":"Fish Plate Welding"},{"value":1946,"label":"Flash Weld"},{"value":1952,"label":"post weld heat treat"},{"value":1949,"label":"post weld heat treatment"},{"value":1317,"label":"pwht"},{"value":1943,"label":"Surfacing Weld"},{"value":1953,"label":"weld heat"},{"value":1955,"label":"what is post weld heat treatment"},{"value":1954,"label":"what is pwht"},{"value":1950,"label":"what is the purpose of post weld heat treatment"}]},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v15.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>All You Need to Know About Post Weld Heat Treatment | PWHT - ZECO<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/zecovalve.com\/es\/brief-introduction-to-post-weld-heat-treatment-pwht-zeco-api-602-forged-valve-manufacturer.html\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"All You Need to Know About Post Weld Heat Treatment | PWHT - ZECO\" \/>\n<meta property=\"og:description\" content=\"API 602 Gate Valves, Bolted Bonnet, Rising Stem, Socket Weld with 100mm Long Plain End Nipples Welded at Both Ends, PWHT. 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