{"id":4485,"date":"2026-09-07T13:44:27","date_gmt":"2026-09-07T13:44:27","guid":{"rendered":"https:\/\/ultrasuonindt.it\/ndt-technologies-and-standards\/flaw-detection\/"},"modified":"2026-09-12T15:11:27","modified_gmt":"2026-09-12T15:11:27","slug":"flaw-detection","status":"publish","type":"page","link":"https:\/\/ultrasuonindt.it\/en\/ndt-technologies-and-standards\/flaw-detection\/","title":{"rendered":"Flaw detection"},"content":{"rendered":"\n<div class=\"wp-block-columns are-vertically-aligned-top is-layout-flex wp-container-core-columns-is-layout-7387b849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-vertically-aligned-top is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:36%\">\n<figure class=\"wp-block-image size-large has-custom-border\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"1200\" height=\"1200\" src=\"https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-strumento_FX70-Flaw-Detector-Powerful_per_misure_di_difetti_e_cricche-web-1200x1200-1.webp?resize=1200%2C1200&#038;ssl=1\" alt=\"Dakota NDT FX70 ultrasonic flaw detector\" class=\"wp-image-1034\" style=\"border-color:#000000;border-width:1px;border-radius:15px\" srcset=\"https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-strumento_FX70-Flaw-Detector-Powerful_per_misure_di_difetti_e_cricche-web-1200x1200-1.webp?w=1200&amp;ssl=1 1200w, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-strumento_FX70-Flaw-Detector-Powerful_per_misure_di_difetti_e_cricche-web-1200x1200-1.webp?resize=300%2C300&amp;ssl=1 300w, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-strumento_FX70-Flaw-Detector-Powerful_per_misure_di_difetti_e_cricche-web-1200x1200-1.webp?resize=1024%2C1024&amp;ssl=1 1024w, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-strumento_FX70-Flaw-Detector-Powerful_per_misure_di_difetti_e_cricche-web-1200x1200-1.webp?resize=150%2C150&amp;ssl=1 150w, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-strumento_FX70-Flaw-Detector-Powerful_per_misure_di_difetti_e_cricche-web-1200x1200-1.webp?resize=768%2C768&amp;ssl=1 768w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:4%\"><\/div>\n\n\n\n<div class=\"wp-block-column is-vertically-aligned-top is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:60%\">\n<div class=\"wp-block-group has-background is-layout-flow wp-block-group-is-layout-flow\" style=\"border-top-right-radius:6px;border-bottom-right-radius:6px;border-left-color:#225f78;border-left-width:6px;background-color:#ebf1f4;padding-top:24px;padding-right:28px;padding-bottom:24px;padding-left:28px\">\n<p class=\"has-text-color wp-block-paragraph\" style=\"color:#225f78;font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.408), 18px);font-style:italic;font-weight:400;line-height:1.6\">In thickness measurement only one echo counts, the back-wall echo. In flaw detection all the others count: those returning from something that should not be inside the material. <\/p>\n<\/div>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<ul class=\"wp-block-list\" style=\"list-style:none;padding-left:0px;line-height:1.6\">\n<li style=\"list-style:none\"><strong style=\"color:#225f78\">\u2713<\/strong> A-Scan to interpret the echo, B-Scan to see its profile<\/li>\n\n\n\n<li style=\"list-style:none\"><strong style=\"color:#225f78\">\u2713<\/strong> DAC and DGS curves to evaluate the amplitude against a reference<\/li>\n\n\n\n<li style=\"list-style:none\"><strong style=\"color:#225f78\">\u2713<\/strong> TCG to compensate for attenuation with depth<\/li>\n\n\n\n<li style=\"list-style:none\"><strong style=\"color:#225f78\">\u2713<\/strong> Shear wave angle probes to reach the weld bead<\/li>\n<\/ul>\n<\/div>\n<\/div>\n\n<p class=\"wp-block-paragraph\">An internal flaw \u2014 a crack, a lack of fusion, an inclusion \u2014 constitutes an acoustic discontinuity: the pulse that meets it is partly reflected and returns to the transducer before the back-wall echo. The instrument&#8217;s task is to make that reflection visible; the operator&#8217;s task is to establish what it means. <\/p>\n\n<p class=\"wp-block-paragraph\">This second part is the reason why flaw detection is not an automatic measurement. The amplitude of an echo depends on the size of the discontinuity, but also on its orientation, on the depth at which it lies and on the attenuation of the material passed through. Evaluating it requires a reference and a qualification.  <\/p>\n\n<div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n<div class=\"wp-block-cover is-light popmake-4066 popmake-739\" style=\"border-width:1px;min-height:250px;aspect-ratio:unset;\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"1200\" height=\"250\" class=\"wp-block-cover__image-background wp-image-727 size-full\" alt=\"\" src=\"https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/banner_technical_support_choose_products.png?resize=1200%2C250&#038;ssl=1\" data-object-fit=\"cover\" srcset=\"https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/banner_technical_support_choose_products.png?w=1200&amp;ssl=1 1200w, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/banner_technical_support_choose_products.png?resize=300%2C63&amp;ssl=1 300w, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/banner_technical_support_choose_products.png?resize=1024%2C213&amp;ssl=1 1024w, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/banner_technical_support_choose_products.png?resize=768%2C160&amp;ssl=1 768w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><span aria-hidden=\"true\" class=\"wp-block-cover__background has-background-dim-30 has-background-dim\" style=\"background-color:#d3d6dc\"><\/span><div class=\"wp-block-cover__inner-container is-layout-constrained wp-container-core-cover-is-layout-15701bb7 wp-block-cover-is-layout-constrained\">\n<p class=\"has-text-align-right has-ti-fg-color is-style-default has-luminous-vivid-amber-color has-text-color has-link-color wp-elements-1 wp-block-paragraph\" style=\"font-size:clamp(21.536px, 1.346rem + ((1vw - 3.2px) * 1.374), 35px);\"><strong>Need help choosing the right product?<\/strong><\/p>\n\n\n\n<div class=\"wp-block-buttons is-content-justification-right is-layout-flex wp-container-core-buttons-is-layout-b507c051 wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button popmake-4066 popmake-739\"><a class=\"wp-block-button__link has-ti-accent-color has-cyan-bluish-gray-background-color has-text-color has-background has-link-color wp-element-button\">Contact us<\/a><\/div>\n<\/div>\n<\/div><\/div>\n\n<div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n<p class=\"wp-block-paragraph\">Reference curves serve precisely this purpose: built on blocks with artificial reflectors of known size, they make it possible to compare the real echo with the one expected at the same depth. Without such a reference, the amplitude on the screen is a meaningless number. <\/p>\n\n<h2 class=\"wp-block-heading\">The in-depth topics of this section<\/h2>\n\n<figure class=\"wp-block-table is-style-stripes\"><table class=\"has-fixed-layout\"><thead><tr><th style=\"background-color:#225f78;color:#ffffff;padding:10px\">Topic<\/th><th style=\"background-color:#225f78;color:#ffffff;padding:10px\">What it answers<\/th><\/tr><\/thead><tbody><tr><td><a href=\"https:\/\/ultrasuonindt.it\/tecnologie-e-normative-ndt\/rilevamento-difetti\/visualizzazione-a-scan\/\">A-Scan display<\/a><\/td><td>What the waveform shows and how to read it<\/td><\/tr><tr><td><a href=\"https:\/\/ultrasuonindt.it\/tecnologie-e-normative-ndt\/rilevamento-difetti\/visualizzazione-b-scan\/\">B-Scan display<\/a><\/td><td>x<\/td><\/tr><tr><td><a href=\"https:\/\/ultrasuonindt.it\/tecnologie-e-normative-ndt\/rilevamento-difetti\/curve-dac-e-dgs\/\">DAC and DGS curves<\/a><\/td><td>How the amplitude of an indication is evaluated<\/td><\/tr><tr><td><a href=\"https:\/\/ultrasuonindt.it\/tecnologie-e-normative-ndt\/rilevamento-difetti\/tcg-e-compensazione-in-profondita\/\">TCG and depth compensation<\/a><\/td><td>Making echoes from different depths comparable<\/td><\/tr><tr><td><a href=\"https:\/\/ultrasuonindt.it\/tecnologie-e-normative-ndt\/rilevamento-difetti\/toolkit-aws-e-indication-rating\/\">AWS toolkit and indication rating<\/a><\/td><td>The calculation required by the American code for welds<\/td><\/tr><tr><td><a href=\"https:\/\/ultrasuonindt.it\/tecnologie-e-normative-ndt\/rilevamento-difetti\/sonde-angolari-e-shear-wave\/\">Angle probes and shear waves<\/a><\/td><td>Perch\u00e9 un cordone si ispeziona con il fascio inclinato<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<h2 class=\"wp-block-heading\">Instrument, probe and reference<\/h2>\n\n<div class=\"wp-block-columns are-vertically-aligned-top is-layout-flex wp-container-core-columns-is-layout-7387b849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-vertically-aligned-top is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:36%\">\n<figure class=\"wp-block-image size-large has-custom-border\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"387\" height=\"387\" src=\"https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-display_con_immagine_rappresentazione_modo_funzionamento_flaw-web-387x387-1.webp?resize=387%2C387&#038;ssl=1\" alt=\"Display in flaw mode of a Dakota NDT instrument\" class=\"wp-image-964\" style=\"border-color:#000000;border-width:1px;border-radius:15px\" srcset=\"https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-display_con_immagine_rappresentazione_modo_funzionamento_flaw-web-387x387-1.webp?w=387&amp;ssl=1 387w, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-display_con_immagine_rappresentazione_modo_funzionamento_flaw-web-387x387-1.webp?resize=300%2C300&amp;ssl=1 300w, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-display_con_immagine_rappresentazione_modo_funzionamento_flaw-web-387x387-1.webp?resize=150%2C150&amp;ssl=1 150w\" sizes=\"auto, (max-width: 387px) 100vw, 387px\" \/><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:4%\"><\/div>\n\n\n\n<div class=\"wp-block-column is-vertically-aligned-top is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:60%\">\n<p class=\"wp-block-paragraph\">A weld inspection requires three coordinated elements: the instrument, which must have the evaluation toolkit required by the applicable code; the angle probe with its wedge, chosen according to the thickness and geometry of the joint; the reference block on which to build the curve.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The Dakota NDT flaw detectors of the FX family include the sizing toolkit with DAC, DGS, TCG and AWS, and also work in thickness measurement mode. The full range is in the <a href=\"https:\/\/ultrasuonindt.it\/en\/products\/flaw-detectors\/\">Flaw detectors<\/a> section. <\/p>\n<\/div>\n<\/div>\n\n<h2 class=\"wp-block-heading\">Frequently asked questions<\/h2>\n\n<div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1757264001\"><strong class=\"schema-faq-question\">Can a thickness gauge detect flaws?<\/strong><p class=\"schema-faq-answer\">They are two different functions. Some high-end thickness gauges have diagnostic features, but the inspection of a weld bead requires a flaw detector with angle probes and reference curves. <\/p><\/div><div class=\"schema-faq-section\" id=\"faq-question-1757264002\"><strong class=\"schema-faq-question\">Why is a reference curve needed?<\/strong><p class=\"schema-faq-answer\">Because the amplitude of an echo also depends on the depth at which the discontinuity lies and on the attenuation of the material. The curve, built on reflectors of known size, provides the term of comparison. <\/p><\/div><div class=\"schema-faq-section\" id=\"faq-question-1757264003\"><strong class=\"schema-faq-question\">Is a qualification required to carry out the inspection?<\/strong><p class=\"schema-faq-answer\">Yes. The interpretation of indications requires an operator qualified according to the standards applicable to the sector and to the type of component inspected. <\/p><\/div><\/div>\n\n<p class=\"wp-block-paragraph\">Go back to <a href=\"https:\/\/ultrasuonindt.it\/en\/ndt-technologies-and-standards\/\">NDT Technologies and Standards<\/a> or write to us from the <a href=\"https:\/\/ultrasuonindt.it\/en\/contact\/\">Contact<\/a> page.<\/p>\n\n<div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\">\n<div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h5 class=\"wp-block-heading\">Further information and contacts <\/h5>\n\n\n\n<p class=\"has-small-font-size wp-block-paragraph\"><a href=\"http:\/\/www.roder.it\">Systems division and sensor integration partner : www.roder.it<\/a><br\/><a href=\"https:\/\/ultrasuonindt.it\/chi-siamo\/\">More information about RODER SRL : about us<\/a><br\/>Contact for general information : <a href=\"mailto:info@roder.it\">info@roder.it<\/a><br\/>Contact for information about these products : <a href=\"mailto:info@roder.it\">info@roder.it<\/a><\/p>\n\n\n\n<p class=\"has-small-font-size wp-block-paragraph\"><br\/>The information contained on this web page is provided for information purposes only. Although it has been compiled with the utmost care, it does not constitute a contractual offer or a binding commitment to supply. It may contain transcription, translation or typographical errors. For precise and up-to-date information, please contact our company directly.    <\/p>\n\n\n\n<p class=\"has-small-font-size wp-block-paragraph\">Some images on this website have been intentionally generated using Artificial Intelligence (AI). This is because, for many applications and projects, it is not possible to disclose photographs of the installation or of the actual system due to confidentiality agreements, confidentiality clauses and non-disclosure agreements (NDAs). <\/p>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>In thickness measurement only one echo counts, the back-wall echo. In flaw detection all the others count: those returning from something that should not be inside the material. An internal flaw \u2014 a crack, a lack of fusion, an inclusion \u2014 constitutes an acoustic discontinuity: the pulse that meets it is partly reflected and returns [&hellip;]<\/p>\n","protected":false},"author":157040980,"featured_media":2758,"parent":4444,"menu_order":2,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_yoast_wpseo_focuskw":"ultrasonic flaw detection","_yoast_wpseo_title":"Ultrasonic flaw detection | Dakota NDT","_yoast_wpseo_metadesc":"How ultrasonic flaw detection works: A-Scan and B-Scan display, DAC and DGS curves, TCG, AWS toolkit and shear wave angle probes.","_wpcom_ai_launchpad_about_page":false,"_wpcom_ai_launchpad_gallery_page":false,"_wpcom_ai_launchpad_contact_page":false,"_wpcom_ai_launchpad_events_page":false,"_wpcom_ai_launchpad_video_page":false,"_wpcom_ai_launchpad_portfolio_piece":false,"footnotes":""},"class_list":["post-4485","page","type-page","status-publish","has-post-thumbnail","hentry"],"yoast_head":"<!-- This site is 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