{"id":6598,"date":"2015-09-28T09:00:26","date_gmt":"2015-09-28T07:00:26","guid":{"rendered":"http:\/\/blog.wika.com\/it\/?p=6598"},"modified":"2023-08-24T15:11:19","modified_gmt":"2023-08-24T13:11:19","slug":"il-test-pmi-positive-material-identification","status":"publish","type":"post","link":"https:\/\/blog.wika.com\/it\/knowhow\/il-test-pmi-positive-material-identification\/","title":{"rendered":"Il test PMI (Positive Material Identification)"},"content":{"rendered":"<p><strong>Il test PMI (Positive Material Identification) serve come prova della presenza dei materiali costitutivi della lega e come conferma dell&#8217;analisi della colata del materiale indicata nel certificato 3.1.<\/strong><\/p>\n<p>Per quanto riguarda i pozzetti termometri, esistono due diverse procedure di prova:<\/p>\n\n      <div class=\"wp-caption alignright\" style=\"max-width:396px;\"><a href=\"https:\/\/blog.wika.com\/de\/files\/2015\/07\/332_PMI_FRA_Result.jpg\"><img decoding=\"async\" src=\"https:\/\/blog.wika.com\/de\/files\/2015\/07\/332_PMI_FRA_Result-388x291.jpg\" alt=\"PMI test: X-ray fluorescence analysis of the thermowell stem\" \/><\/a><p class=\"wp-caption-text\">Analisi di fluorescenza ai raggi X dello stelo di un pozzetto<\/p><\/div>\n    \n<h2>1. Analisi di fluorescenza ai raggi X (XRF)<\/h2>\n<p>Questo metodo utilizza i raggi X per stimolare gli atomi del materiale del pozzetto a produrre una radiazione naturale, senza danneggiare la superficie del metallo. La lunghezza d&#8217;onda e l&#8217;intensit\u00e0 della radiazione emessa \u00e8 una misura degli elementi costitutivi della lega e della loro concentrazione.<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n\n      <div class=\"wp-caption alignright\" style=\"max-width:396px;\"><a href=\"https:\/\/blog.wika.com\/de\/files\/2015\/07\/332_PMI_OES_Test2.jpg\"><img decoding=\"async\" src=\"https:\/\/blog.wika.com\/de\/files\/2015\/07\/332_PMI_OES_Test2-388x291.jpg\" alt=\"PMI test: Spectrographic analysis on a WIKA model TW10 flange thermowell\" \/><\/a><p class=\"wp-caption-text\">Analisi spettrografica di un pozzetto flangiato WIKA modello TW10<\/p><\/div>\n    \n<h2>2. Analisi spettrografica (OES)<\/h2>\n<p>Con l&#8217;analisi spettrografica (Optical Emission Spectroscopy) viene generato un arco tra la superficie del pozzetto ed un elettrodo di tungsteno dello strumento di prova. Lo spettro di questo arco permette l\u2019identificazione degli elementi della lega, sia dal punto di vista qualitativo che quantitativo.<\/p>\n<p>L\u2019analisi OES lascia sul materiale un segno caratteristico di bruciatura del diametro di circa 5 mm.<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n\n      <div class=\"wp-caption alignleft\" style=\"max-width:396px;\"><a href=\"https:\/\/blog.wika.com\/de\/files\/2015\/07\/332_pmi_oes_burn-388x229.jpg\"><img decoding=\"async\" src=\"https:\/\/blog.wika.com\/de\/files\/2015\/07\/332_pmi_oes_burn-388x229-388x229.jpg\" alt=\"Burn mark from the arc on a workpiece\" \/><\/a><p class=\"wp-caption-text\">Caratteristico segno di bruciatura dovuto all&#8217;arco<\/p><\/div>\n    \n","protected":false},"excerpt":{"rendered":"<p>Il test PMI (Positive Material Identification) serve come prova della presenza dei materiali costitutivi della lega e come conferma dell&#8217;analisi della colata del materiale indicata nel certificato 3.1. Per quanto riguarda i pozzetti termometri, esistono due diverse procedure di prova: 1. Analisi di fluorescenza ai raggi X (XRF) Questo metodo utilizza i raggi X per [&hellip;]<\/p>\n","protected":false},"author":32,"featured_media":6599,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[174],"tags":[216,255,243],"class_list":["post-6598","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-knowhow","tag-corrosione","tag-euromisure","tag-materiali"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Il test PMI (Positive Material Identification)<\/title>\n<meta name=\"description\" content=\"Il test PMI serve come prova della presenza dei componenti della lega e come conferma della fusione del materiale.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link 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