{"id":9391,"date":"2026-04-17T12:45:30","date_gmt":"2026-04-17T12:45:30","guid":{"rendered":"https:\/\/ultrasuonindt.it\/aws-d1-1-and-ultrasonic-weld-inspection-requirements-and-instruments\/"},"modified":"2026-10-03T16:57:36","modified_gmt":"2026-10-03T16:57:36","slug":"aws-d1-1-and-ultrasonic-weld-inspection-requirements-and-instruments","status":"publish","type":"post","link":"https:\/\/ultrasuonindt.it\/en\/aws-d1-1-and-ultrasonic-weld-inspection-requirements-and-instruments\/","title":{"rendered":"AWS D1.1 and ultrasonic weld inspection: requirements and instruments"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><strong>AWS D1.1 &#8220;Structural Welding Code \u2013 Steel&#8221;<\/strong> is the American reference standard for welding carbon and low-alloy steel structures. Published by the American Welding Society, it is adopted worldwide in civil engineering, offshore construction, bridges, tanks and heavy industrial steelwork. The part covering ultrasonic weld inspection sets specific instrumentation requirements, which the <strong>Dakota NDT FX70-DL, FX71-DL and FX81-DL flaw detectors<\/strong> are declared to meet.  <\/p>\n\n<figure class=\"wp-block-image aligncenter size-large is-resized\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"1500\" height=\"900\" src=\"https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-strumento_FX71-DL_Flaw-Detector_misura_spessore_e_difetti_su_lamiera.jpg?resize=1500%2C900&#038;ssl=1\" alt=\"AWS D1.1 ultrasonic weld inspection\" class=\"wp-image-201\" style=\"width:600px\" srcset=\"https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-strumento_FX71-DL_Flaw-Detector_misura_spessore_e_difetti_su_lamiera.jpg?w=1500&amp;ssl=1 1500w, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-strumento_FX71-DL_Flaw-Detector_misura_spessore_e_difetti_su_lamiera.jpg?resize=300%2C180&amp;ssl=1 300w, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-strumento_FX71-DL_Flaw-Detector_misura_spessore_e_difetti_su_lamiera.jpg?resize=1024%2C614&amp;ssl=1 1024w, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-strumento_FX71-DL_Flaw-Detector_misura_spessore_e_difetti_su_lamiera.jpg?resize=768%2C461&amp;ssl=1 768w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/figure>\n\n<h2 class=\"wp-block-heading\">Structure of AWS D1.1 and the place of UT inspection<\/h2>\n\n<p class=\"wp-block-paragraph\">AWS D1.1 is organised into clauses covering the entire life cycle of a structural weld: procedure qualification (WPS), welder qualification, fabrication, inspection, in-service verification. <strong>Clause 6 &#8220;Inspection&#8221;<\/strong> defines the permitted non-destructive testing methods: <\/p>\n\n<ul class=\"wp-block-list\">\n<li>VT (Visual Testing) \u2014 mandatory visual inspection<\/li>\n<li>PT (Penetrant Testing) \u2014 liquid penetrant testing<\/li>\n<li>MT (Magnetic Testing) \u2014 magnetic particle testing<\/li>\n<li>UT (Ultrasonic Testing) \u2014 ultrasonic testing<\/li>\n<li>RT (Radiographic Testing) \u2014 radiographic testing<\/li>\n<\/ul>\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\">UT is particularly important for butt welds on thicknesses greater than 8 mm and for welds in joints that do not lend themselves to radiography (T-joints, cruciform joints, corner joints). AWS D1.1 devotes <strong>Clause 6 Part F<\/strong> to UT, with specific procedures. <\/p>\n\n<h2 class=\"wp-block-heading\">UT instrumentation requirements in AWS D1.1<\/h2>\n\n<figure class=\"wp-block-image aligncenter size-large is-resized\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"387\" height=\"252\" src=\"https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-emissione_ultrasuoni_da_testina_di_lettura_schema_funzionamento.jpg?resize=387%2C252&#038;ssl=1\" alt=\"Diagram of ultrasonic weld inspection with angle probes\" class=\"wp-image-258\" style=\"width:500px\" srcset=\"https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-emissione_ultrasuoni_da_testina_di_lettura_schema_funzionamento.jpg?w=387&amp;ssl=1 387w, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-emissione_ultrasuoni_da_testina_di_lettura_schema_funzionamento.jpg?resize=300%2C195&amp;ssl=1 300w\" sizes=\"auto, (max-width: 387px) 100vw, 387px\" \/><\/figure>\n\n<p class=\"wp-block-paragraph\">The technical requirements that UT inspection to AWS D1.1 places on the instrument and the probes are:<\/p>\n\n<ul class=\"wp-block-list\">\n<li><strong>Frequency range<\/strong> typically 2 \u2013 5 MHz (although AWS D1.1 allows an extended range in specific cases)<\/li>\n<li><strong>Angle probes<\/strong>: 45\u00b0, 60\u00b0, 70\u00b0 (shear wave transducers)<\/li>\n<li>Ability to perform <strong>calibration on the IIW block<\/strong> or other reference blocks defined by AWS<\/li>\n<li><strong>Gain system<\/strong> with steps of 1 dB or less<\/li>\n<li>Verifiable <strong>vertical and horizontal linearity<\/strong><\/li>\n<li>Adequate <strong>signal-to-noise ratio<\/strong><\/li>\n<li>Clear, readable <strong>A-Scan display<\/strong><\/li>\n<li>Ability to set a <strong>reference level<\/strong> and evaluate echoes in relative dB<\/li>\n<\/ul>\n\n<h2 class=\"wp-block-heading\">The AWS toolkit built into the Dakota FX<\/h2>\n\n<figure class=\"wp-block-image aligncenter size-large is-resized\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"1720\" height=\"1200\" src=\"https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-FX71-DL_rilevatore_di_difetti_ad_ultrasuoni.jpeg?resize=1720%2C1200&#038;ssl=1\" alt=\"Dakota FX71-DL flaw detector with AWS toolkit\" class=\"wp-image-265\" style=\"width:500px\" srcset=\"https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-FX71-DL_rilevatore_di_difetti_ad_ultrasuoni.jpeg?w=1720&amp;ssl=1 1720w, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-FX71-DL_rilevatore_di_difetti_ad_ultrasuoni.jpeg?resize=300%2C209&amp;ssl=1 300w, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-FX71-DL_rilevatore_di_difetti_ad_ultrasuoni.jpeg?resize=1024%2C714&amp;ssl=1 1024w, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-FX71-DL_rilevatore_di_difetti_ad_ultrasuoni.jpeg?resize=768%2C536&amp;ssl=1 768w, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-FX71-DL_rilevatore_di_difetti_ad_ultrasuoni.jpeg?resize=1536%2C1072&amp;ssl=1 1536w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/figure>\n\n<p class=\"wp-block-paragraph\">The Dakota <strong>FX70-DL, FX71-DL and FX81-DL<\/strong> flaw detectors natively include \u2014 according to the official data sheet \u2014 an <strong>AWS toolkit for automatic flaw sizing<\/strong> using the AWS D1.1 method. This means the operator does not have to carry out the indication rating calculations (indication level d) by hand: <\/p>\n\n<ul class=\"wp-block-list\">\n<li>The <strong>reference level b<\/strong> is set on the echo from a reference reflector<\/li>\n<li>The echo of the actual indication is measured (<strong>indication level a<\/strong>)<\/li>\n<li>The instrument automatically calculates the attenuation factor (<strong>c<\/strong>) based on the sound path<\/li>\n<li>The <strong>indication rating d = a \u2212 b \u2212 c<\/strong> is calculated automatically<\/li>\n<li>The value d can be compared directly with the acceptance criteria of Table 6.2 of AWS D1.1<\/li>\n<\/ul>\n\n<h2 class=\"wp-block-heading\">Other built-in toolkits<\/h2>\n\n<p class=\"wp-block-paragraph\">The Dakota FX include other toolkits that are also useful for standards other than AWS D1.1:<\/p>\n\n<ul class=\"wp-block-list\">\n<li><strong>DAC (Distance Amplitude Correction)<\/strong>: amplitude correction curve as a function of distance, useful for inspections to EN ISO 17640 and ASME V<\/li>\n<li><strong>TCG (Time Corrected Gain)<\/strong>: automatic software compensation for attenuation<\/li>\n<li><strong>DGS (Distance Gain Size) \/ AVG<\/strong>: European flaw sizing method based on theoretical curves<\/li>\n<li><strong>Z-Cross, Flank, Peak detection<\/strong>: three selectable methods for the measurement point on the echo<\/li>\n<\/ul>\n\n<h2 class=\"wp-block-heading\">Qualification of UT personnel to AWS D1.1<\/h2>\n\n<p class=\"wp-block-paragraph\">AWS D1.1 requires the UT operator to be qualified under a recognised scheme, typically:<\/p>\n\n<ul class=\"wp-block-list\">\n<li><strong>AWS CWI (Certified Welding Inspector)<\/strong> with UT endorsement<\/li>\n<li><strong>ASNT Level II UT<\/strong> (SNT-TC-1A or CP-189)<\/li>\n<li><strong>EN ISO 9712 Level 2 UT<\/strong>, commonly accepted in Europe and recognised in many international specifications<\/li>\n<\/ul>\n\n<h2 class=\"wp-block-heading\">Documentation and reporting<\/h2>\n\n<p class=\"wp-block-paragraph\">AWS D1.1 requires a formal <strong>UT report<\/strong> to be produced for every inspection, including the instrument parameters, the reference calibration, the position of the indications, the flaw sizes and their classification against the acceptance criteria. The Dakota FX, with a data logger of up to 4 GB and <strong>DakMaster\u2122<\/strong> integration, make it possible to store the A-Scan of each indication, simplifying the preparation of professional reports compliant with AWS requirements. <\/p>\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n<p class=\"wp-block-paragraph\">For advice on configuring a Dakota flaw detector for AWS D1.1 inspections and for hands-on training services, <a href=\"https:\/\/ultrasuonindt.it\/en\/contact\/\">contact our technical department<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>AWS D1.1 is the American reference standard for welding steel structures. Clause 6 defines the requirements for ultrasonic testing (UT) of structural welds. The Dakota FX70-DL, FX71-DL and FX81-DL flaw detectors include the AWS toolkit for automatic flaw sizing.  <\/p>\n","protected":false},"author":157040980,"featured_media":9392,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_wpcom_ai_launchpad_first_post":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"{title}\n\n{excerpt}\n\n{url}","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"_wpas_customize_per_network":false,"jetpack_post_was_ever_published":false},"categories":[179],"tags":[185,170,171,169,77,76],"class_list":["post-9391","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-standards-and-regulations","tag-aws-d1-1-weld-inspection","tag-dac-curves-for-defect-sizing","tag-dgs-avg-technique-for-defect-sizing","tag-tcg-time-corrected-gain-in-ultrasonics","tag-thickness-measurement-on-carbon-steel","tag-ultrasonic-corrosion-measurement"],"yoast_head":"<!-- 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