{"id":100309,"date":"2026-02-15T20:26:30","date_gmt":"2026-02-15T20:26:30","guid":{"rendered":"https:\/\/vibromera.eu\/?post_type=calculator&#038;p=100309"},"modified":"2026-02-15T20:26:30","modified_gmt":"2026-02-15T20:26:30","slug":"weld-quality-iso5817","status":"publish","type":"calculator","link":"https:\/\/vibromera.eu\/bn\/calculators\/weld-quality-iso5817\/","title":{"rendered":"Weld Quality Levels ISO 5817 Checker | Free Online Tool"},"content":{"rendered":"\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"WebApplication\",\"name\":\"Weld Quality ISO 5817 Checker\",\"description\":\"Check weld imperfections against ISO 5817 quality levels B, C, D.\",\"url\":\"https:\/\/vibromera.eu\/calculators\/weld-quality-iso5817\/\",\"applicationCategory\":\"Engineering Calculator\",\"operatingSystem\":\"Any\",\"offers\":{\"@type\":\"Offer\",\"price\":\"0\",\"priceCurrency\":\"EUR\"},\"creator\":{\"@type\":\"Organization\",\"name\":\"Vibromera\",\"url\":\"https:\/\/vibromera.eu\/\"},\"datePublished\":\"2025-01-01\",\"dateModified\":\"2026-02-15\",\"inLanguage\":\"en\",\"isAccessibleForFree\":true}<\/script>\n\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[\n{\"@type\":\"Question\",\"name\":\"What are ISO 5817 quality levels?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"ISO 5817 defines three quality levels for fusion-welded joints: Level D (lowest\/moderate), Level C (intermediate\/standard), and Level B (highest\/stringent). Each level specifies maximum permissible dimensions for various weld imperfections.\"}},\n{\"@type\":\"Question\",\"name\":\"When should I specify quality level B?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Level B is required for highly stressed welds, fatigue-loaded structures, pressure vessels, and safety-critical components. It demands the smallest imperfections and highest quality. Level C is the default for general structural work.\"}},\n{\"@type\":\"Question\",\"name\":\"What imperfections does ISO 5817 cover?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"ISO 5817 covers: undercut, excess weld metal (reinforcement), linear misalignment, angular misalignment, incomplete penetration, porosity, slag inclusions, cracks (not permitted at any level), lack of fusion, and various surface imperfections.\"}},\n{\"@type\":\"Question\",\"name\":\"How is undercut limit determined?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Undercut limits depend on the quality level: Level B allows \u22640.5mm (max), Level C allows \u22640.5mm (short) or \u22641mm, Level D allows \u22641.0mm. The actual limit also depends on plate thickness.\"}},\n{\"@type\":\"Question\",\"name\":\"Are cracks ever acceptable per ISO 5817?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. Cracks are not permitted at any quality level (B, C, or D) per ISO 5817. Any crack detected in the weld, HAZ, or base metal requires repair regardless of size.\"}}\n]}<\/script>\n\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"BreadcrumbList\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/vibromera.eu\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Calculators\",\"item\":\"https:\/\/vibromera.eu\/calculators\/\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"Weld Quality ISO 5817\",\"item\":\"https:\/\/vibromera.eu\/calculators\/weld-quality-iso5817\/\"}]}<\/script>\n\n<link rel=\"preconnect\" href=\"https:\/\/fonts.googleapis.com\">\n\n<link rel=\"preconnect\" href=\"https:\/\/fonts.gstatic.com\" crossorigin>\n\n<link 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class=\"vc-calculator\" id=\"vc-iso5817\">\n<header class=\"vc-header\">\n    <p class=\"vc-header-eyebrow\">Free Engineering Tool<\/p>\n    <h1 class=\"vc-header-title\">Weld Quality Levels \u2014 ISO 5817<\/h1>\n    <p class=\"vc-header-subtitle\">Check if a measured weld imperfection meets ISO 5817 quality level B, C, or D. Select imperfection type and enter the measured value.<\/p>\n    <div class=\"vc-badges\"><span class=\"vc-badge\">ISO 5817<\/span><span class=\"vc-badge\">Levels B \/ C \/ D<\/span><span class=\"vc-badge\">Fusion Welding<\/span><\/div>\n<\/header>\n<div class=\"vc-card\">\n    <form class=\"vc-form\" id=\"vc-form\" autocomplete=\"off\">\n        <div class=\"vc-form-grid\">\n            <div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-imperf\">Imperfection Type<\/label>\n                <select class=\"vc-select\" id=\"vc-imperf\">\n                    <option value=\"undercut\" data-b=\"0.5\" data-c=\"0.5\" data-d=\"1.0\" selected>Undercut (mm)<\/option>\n                    <option value=\"reinforcement\" data-b=\"1.0\" data-c=\"1.5\" data-d=\"2.0\">Excess reinforcement \u2014 butt (mm)<\/option>\n                    <option value=\"linear_mis\" data-b=\"0.5\" data-c=\"1.0\" data-d=\"1.5\">Linear misalignment (mm)<\/option>\n                    <option value=\"porosity\" data-b=\"1.5\" data-c=\"2.5\" data-d=\"4.0\">Single pore diameter (mm)<\/option>\n                    <option value=\"incomplete_pen\" data-b=\"0\" data-c=\"0\" data-d=\"1.0\">Incomplete penetration (mm)<\/option>\n                    <option value=\"crater\" data-b=\"0\" data-c=\"0\" data-d=\"1.0\">Crater pipe depth (mm)<\/option>\n                <\/select>\n            <\/div>\n            <div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-meas\">Measured Value <span class=\"vc-label-hint\">(mm)<\/span><\/label><input class=\"vc-input\" type=\"number\" id=\"vc-meas\" step=\"0.1\" min=\"0\" value=\"0.3\"><\/div>\n        <\/div>\n        <div class=\"vc-presets\">\n            <div class=\"vc-presets-label\">Quick checks<\/div>\n            <button type=\"button\" class=\"vc-preset-btn\" data-i=\"undercut\" data-v=\"0.3\">Undercut 0.3mm<\/button>\n            <button type=\"button\" class=\"vc-preset-btn\" data-i=\"undercut\" data-v=\"0.8\">Undercut 0.8mm<\/button>\n            <button type=\"button\" class=\"vc-preset-btn\" data-i=\"reinforcement\" data-v=\"1.2\">Reinforcement 1.2mm<\/button>\n        <\/div>\n    <\/form>\n    <div class=\"vc-results\" id=\"vc-results\">\n        <div class=\"vc-results-head\"><h2 class=\"vc-results-title\">Acceptance Check<\/h2><button type=\"button\" class=\"vc-copy-btn\" id=\"vc-copy-btn\"><svg width=\"14\" height=\"14\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><rect x=\"9\" y=\"9\" width=\"13\" height=\"13\" rx=\"2\"\/><path d=\"M5 15H4a2 2 0 01-2-2V4a2 2 0 012-2h9a2 2 0 012 2v1\"\/><\/svg> Copy<\/button><\/div>\n        <div class=\"vc-result-grid\">\n            <div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Level D (Moderate)<\/div><div class=\"vc-rcard-value\" id=\"vc-r-d\">\u2014<\/div><\/div>\n            <div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Level C (Standard)<\/div><div class=\"vc-rcard-value\" id=\"vc-r-c\">\u2014<\/div><\/div>\n            <div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Level B (Stringent)<\/div><div class=\"vc-rcard-value\" id=\"vc-r-b\">\u2014<\/div><\/div>\n        <\/div>\n    <\/div>\n<\/div>\n<div class=\"vc-section vc-open\"><button type=\"button\" class=\"vc-section-toggle\" aria-expanded=\"true\"><span class=\"vc-section-toggle-text\"><span class=\"vc-section-icon\">\ud83d\udcd8<\/span><span class=\"vc-section-title\">Reference Table<\/span><\/span><svg class=\"vc-section-chevron\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><path d=\"M6 9l6 6 6-6\"\/><\/svg><\/button>\n    <div class=\"vc-section-body\"><div class=\"vc-section-inner vc-theory\">\n        <h3>ISO 5817 Acceptance Limits (Simplified)<\/h3>\n        <table class=\"vc-table\"><thead><tr><th>Imperfection<\/th><th>Level D<\/th><th>Level C<\/th><th>Level B<\/th><\/tr><\/thead><tbody>\n            <tr><td>Undercut<\/td><td>\u22641.0 mm<\/td><td>\u22640.5 mm<\/td><td>\u22640.5 mm<\/td><\/tr>\n            <tr><td>Excess reinforcement (butt)<\/td><td>\u22642.0 mm<\/td><td>\u22641.5 mm<\/td><td>\u22641.0 mm<\/td><\/tr>\n            <tr><td>Linear misalignment<\/td><td>\u22641.5 mm<\/td><td>\u22641.0 mm<\/td><td>\u22640.5 mm<\/td><\/tr>\n            <tr><td>Single pore<\/td><td>\u22644.0 mm<\/td><td>\u22642.5 mm<\/td><td>\u22641.5 mm<\/td><\/tr>\n            <tr><td>Incomplete penetration<\/td><td>\u22641.0 mm<\/td><td>Not permitted<\/td><td>Not permitted<\/td><\/tr>\n            <tr><td>Cracks<\/td><td colspan=\"3\" style=\"text-align:center;color:var(--vc-red)\">Not permitted at any level<\/td><\/tr>\n        <\/tbody><\/table>\n        <p>These are simplified values for plate thickness 3\u201330 mm. Actual limits per ISO 5817 depend on plate thickness and may include percentage-based criteria.<\/p>\n    <\/div><\/div>\n<\/div>\n<div class=\"vc-section\"><button type=\"button\" class=\"vc-section-toggle\" aria-expanded=\"false\"><span class=\"vc-section-toggle-text\"><span class=\"vc-section-icon\">\ud83d\udd17<\/span><span class=\"vc-section-title\">Related<\/span><\/span><svg class=\"vc-section-chevron\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><path d=\"M6 9l6 6 6-6\"\/><\/svg><\/button>\n    <div class=\"vc-section-body\"><div class=\"vc-section-inner\"><div class=\"vc-related\"><a class=\"vc-related-link\" href=\"\/calculators\/weld-strength-calculator\/\">Weld Strength<\/a><a class=\"vc-related-link\" href=\"\/calculators\/welding-process-iso4063\/\">Welding Process ISO 4063<\/a><\/div><\/div><\/div>\n<\/div>\n<div class=\"vc-section\"><button type=\"button\" class=\"vc-section-toggle\" aria-expanded=\"false\"><span class=\"vc-section-toggle-text\"><span class=\"vc-section-icon\">\u2753<\/span><span class=\"vc-section-title\">FAQ<\/span><\/span><svg class=\"vc-section-chevron\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><path d=\"M6 9l6 6 6-6\"\/><\/svg><\/button>\n    <div class=\"vc-section-body\"><div class=\"vc-section-inner\"><div class=\"vc-faq-list\" id=\"vc-faq-list\"><\/div><\/div><\/div>\n<\/div>\n<div class=\"vc-promo\"><div class=\"vc-promo-text\"><strong>Vibromera<\/strong> \u2014 Engineering tools.<\/div><a class=\"vc-promo-link\" href=\"https:\/\/vibromera.eu\/\" target=\"_blank\" rel=\"noopener\">Learn More<\/a><\/div>\n<footer class=\"vc-footer\"><p>\u00a9 2024\u20132026 <a href=\"https:\/\/vibromera.eu\/\">Vibromera<\/a><\/p><div class=\"vc-footer-links\"><a href=\"\/calculators\/engineering-calculators\/\">All Calculators<\/a><a href=\"https:\/\/vibromera.eu\/contacts\/\">Contact<\/a><\/div><\/footer>\n<\/div>\n<script>\n(function(){\n    'use strict';\n    function $(id){return document.getElementById(id)}\n    function calculate(){\n        var o=$('vc-imperf').selectedOptions[0];\n        var limB=parseFloat(o.getAttribute('data-b')),limC=parseFloat(o.getAttribute('data-c')),limD=parseFloat(o.getAttribute('data-d'));\n        var v=parseFloat($('vc-meas').value);\n        if(isNaN(v)||v<0){$('vc-results').classList.remove('vc-visible');return}\n        function check(lim){if(lim===0)return v===0?'\u2705 OK':'\u274c Not permitted';return v<=lim?'\u2705 \u2264'+lim+'mm':'\u274c >'+lim+'mm';}\n        $('vc-r-d').innerHTML=check(limD);\n        $('vc-r-c').innerHTML=check(limC);\n        $('vc-r-b').innerHTML=check(limB);\n        \/\/ Color coding\n        ['vc-r-d','vc-r-c','vc-r-b'].forEach(function(id){var el=$(id);el.style.color=el.textContent.includes('\u2705')?'var(--vc-green)':'var(--vc-red)';});\n        $('vc-results').classList.add('vc-visible');\n    }\n    document.querySelectorAll('.vc-preset-btn').forEach(function(b){b.addEventListener('click',function(e){e.preventDefault();$('vc-imperf').value=this.getAttribute('data-i');$('vc-meas').value=this.getAttribute('data-v');calculate()})});\n    $('vc-form').addEventListener('input',calculate);$('vc-form').addEventListener('change',calculate);\n    $('vc-copy-btn').addEventListener('click',function(){var text='ISO 5817 Check\\nType: '+$('vc-imperf').selectedOptions[0].textContent+'\\nMeasured: '+$('vc-meas').value+'mm\\nLevel D: '+$('vc-r-d').textContent+'\\nLevel C: '+$('vc-r-c').textContent+'\\nLevel B: '+$('vc-r-b').textContent+'\\nvibromera.eu';if(navigator.clipboard){navigator.clipboard.writeText(text).then(function(){var b=$('vc-copy-btn');b.classList.add('vc-copied');b.innerHTML='Copied!';setTimeout(function(){b.classList.remove('vc-copied');b.innerHTML='<svg width=\"14\" height=\"14\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><rect x=\"9\" y=\"9\" width=\"13\" height=\"13\" rx=\"2\"\/><path d=\"M5 15H4a2 2 0 01-2-2V4a2 2 0 012-2h9a2 2 0 012 2v1\"\/><\/svg> Copy'},2000)})}});\n    document.querySelectorAll('.vc-section-toggle').forEach(function(btn){btn.addEventListener('click',function(){var s=this.closest('.vc-section');s.classList.toggle('vc-open');this.setAttribute('aria-expanded',s.classList.contains('vc-open'))})});\n    var faqData=[{q:'What are ISO 5817 quality levels?',a:'<p>Three levels: D (lowest\/moderate), C (standard), B (highest\/stringent). Each defines max permissible imperfection dimensions.<\/p>'},{q:'When to specify level B?',a:'<p>For highly stressed, fatigue-loaded, pressure vessel, and safety-critical welds. Level C is default for general structural work.<\/p>'},{q:'What imperfections does ISO 5817 cover?',a:'<p>Undercut, reinforcement, misalignment, porosity, slag, incomplete penetration, cracks, lack of fusion, and surface imperfections.<\/p>'},{q:'How is undercut limit determined?',a:'<p>Level B: \u22640.5mm, Level C: \u22640.5mm (short), Level D: \u22641.0mm. Also depends on plate thickness.<\/p>'},{q:'Are cracks ever acceptable?',a:'<p>No. Cracks are not permitted at any quality level per ISO 5817.<\/p>'}];\n    var fl=$('vc-faq-list');faqData.forEach(function(f){fl.innerHTML+='<div class=\"vc-faq-item\"><button type=\"button\" class=\"vc-faq-q\"><span>'+f.q+'<\/span><svg class=\"vc-faq-chevron\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><path d=\"M6 9l6 6 6-6\"\/><\/svg><\/button><div class=\"vc-faq-a\"><div class=\"vc-faq-a-inner\">'+f.a+'<\/div><\/div><\/div>'});\n    fl.addEventListener('click',function(e){var b=e.target.closest('.vc-faq-q');if(b)b.closest('.vc-faq-item').classList.toggle('vc-open')});\n    calculate();\n})();\n<\/script>\n","protected":false},"excerpt":{"rendered":"<p>Free online ISO 5817 weld quality level checker. Enter imperfection type and measured value to determine if the weld meets quality level B, C, or D requirements.<\/p>","protected":false},"featured_media":0,"template":"","meta":{"ai_generated_summary":"","footnotes":""},"categories":[],"tags":[],"class_list":["post-100309","calculator","type-calculator","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/calculator\/100309","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/calculator"}],"about":[{"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/types\/calculator"}],"version-history":[{"count":1,"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/calculator\/100309\/revisions"}],"predecessor-version":[{"id":100517,"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/calculator\/100309\/revisions\/100517"}],"wp:attachment":[{"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/media?parent=100309"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/categories?post=100309"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/tags?post=100309"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}