Welding Heat Input Calculator<\/title>\n<meta name=\"description\" content=\"Estimate welding heat input per unit length (kJ\/mm, kJ\/cm, J\/mm) from arc voltage, welding current, travel speed and process thermal efficiency.\">\n<style>\n :root {\n --bg: #ffffff;\n --field-bg: #f3f5f8;\n --surface: #ffffff;\n --ink: #1c1d1f;\n --muted: #5a5d63;\n --line: #d6dbe3;\n --accent: #1d4ed8;\n --accent-ink: #ffffff;\n --accent-soft: #eef3ff;\n --error: #b42318;\n --error-soft: #fdecea;\n --focus: #1e40af;\n --radius: 10px;\n }\n @media (prefers-color-scheme: dark) {\n :root:not([data-theme=\"light\"]) {\n --bg: #141518;\n --field-bg: #23262b;\n --surface: #1d1f23;\n --ink: #ecebe8;\n --muted: #a4a7ad;\n --line: #34373d;\n --accent: #60a5fa;\n --accent-ink: #0b1a33;\n --accent-soft: #15233d;\n --error: #f97066;\n --error-soft: #2d1716;\n --focus: #bfd4ff;\n }\n }\n * { box-sizing: border-box; }\n body {\n margin: 0;\n background: var(--bg);\n color: var(--ink);\n font: 16px\/1.55 system-ui, -apple-system, \"Segoe UI\", Roboto, \"Helvetica Neue\", Arial, sans-serif;\n }\n .wrap { max-width: 640px; margin: 0 auto; padding: 32px 16px 48px; }\n header h1 { margin: 0 0 6px; font-size: clamp(1.6rem, 4vw, 2.2rem); letter-spacing: -0.01em; }\n header p { margin: 0; color: var(--muted); max-width: 62ch; }\n .tag {\n display: inline-block; margin-bottom: 10px; padding: 2px 10px;\n border: 1px solid var(--accent); border-radius: 999px;\n color: var(--accent); font-size: .78rem; font-weight: 600; letter-spacing: .06em; text-transform: uppercase;\n }\n .grid { display: grid; grid-template-columns: 1fr; gap: 20px; }\n .card {\n background: var(--surface); border: 1px solid var(--line);\n border-radius: var(--radius); padding: 22px;\n }\n fieldset { border: 0; margin: 0; padding: 0; min-width: 0; }\n .grid > * { min-width: 0; }\n legend { font-weight: 700; font-size: 1.05rem; margin-bottom: 14px; padding: 0; }\n .field { margin-bottom: 16px; }\n .field label { display: block; font-weight: 600; margin-bottom: 6px; }\n .control { display: flex; align-items: stretch; }\n .control input, .control select {\n font: inherit; color: var(--ink); background: var(--surface);\n border: 1px solid var(--line); padding: 10px 12px; min-height: 44px;\n }\n .control input { flex: 1; min-width: 0; border-radius: 8px 0 0 8px; }\n .control .unit {\n display: flex; align-items: center; padding: 0 14px; min-width: 64px; justify-content: center;\n border: 1px solid var(--line); border-left: 0; border-radius: 0 8px 8px 0;\n background: var(--field-bg); color: var(--muted); font-weight: 600;\n }\n .control select { border-left: 0; border-radius: 0 8px 8px 0; background: var(--field-bg); font-weight: 600; cursor: pointer; }\n input:focus-visible, select:focus-visible, button:focus-visible {\n outline: 3px solid var(--focus); outline-offset: 2px;\n }\n .field[data-invalid=\"true\"] input { border-color: var(--error); background: var(--error-soft); }\n .hint { display: block; margin-top: 6px; color: var(--muted); font-size: .88rem; }\n .err { display: none; margin-top: 6px; color: var(--error); font-size: .88rem; font-weight: 600; }\n .field[data-invalid=\"true\"] .err { display: block; }\n .actions { display: flex; justify-content: center; margin-top: 8px; }\n .btn-primary { min-width: 160px; }\n button {\n font: inherit; font-weight: 700; min-height: 44px; padding: 10px 20px;\n border-radius: 8px; cursor: pointer; border: 1px solid transparent;\n }\n .btn-primary { background: var(--accent); color: var(--accent-ink); }\n .btn-primary:hover { filter: brightness(1.07); }\n .btn-ghost { background: transparent; color: var(--ink); border-color: var(--line); }\n .btn-ghost:hover { background: var(--bg); }\n\n .results h2 { margin: 0 0 4px; font-size: 1.05rem; }\n .results .sub { margin: 0 0 16px; min-height: 0; color: var(--muted); font-size: .9rem; }\n .results ul { list-style: none; margin: 0; padding: 0; }\n .results li {\n display: flex; justify-content: space-between; align-items: baseline; gap: 12px;\n padding: 12px 0; border-top: 1px solid var(--line);\n }\n .results li:first-child { border-top: 0; }\n .results .label { color: var(--muted); font-size: .92rem; }\n .results .value { font-variant-numeric: tabular-nums; font-weight: 700; font-size: 1.15rem; text-align: right; white-space: nowrap; }\n .results .value small { font-weight: 600; color: var(--muted); font-size: .8rem; margin-left: 4px; }\n .results li.primary {\n background: var(--accent-soft); border-radius: 8px; padding: 14px; border-top: 0; margin-bottom: 6px;\n }\n .results li.primary .value { font-size: 1.6rem; color: var(--accent); }\n .results li.primary + li { border-top: 0; }\n .estimate-note {\n margin: 14px 0 0; font-size: .85rem; color: var(--muted);\n border-left: 3px solid var(--accent); padding-left: 10px;\n }\n .form-error {\n display: none; margin: 0 0 14px; padding: 10px 12px; border-radius: 8px;\n background: var(--error-soft); color: var(--error); font-weight: 600; font-size: .92rem;\n }\n .form-error.show { display: block; }\n\n section.info { margin-top: 20px; }\n section.info h2 { font-size: 1.15rem; margin: 0 0 10px; }\n section.info p, section.info li { color: var(--ink); }\n .formula {\n display: block; overflow-x: auto; margin: 10px 0; padding: 12px 14px;\n background: var(--bg); border: 1px solid var(--line); border-radius: 8px;\n font: .92rem\/1.5 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; white-space: normal; overflow-wrap: anywhere;\n }\n table { width: 100%; border-collapse: collapse; font-size: .92rem; margin-top: 8px; }\n th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--line); }\n th { color: var(--muted); font-weight: 600; }\n .disclaimer { background: var(--accent-soft); border-color: transparent; }\n .disclaimer strong { color: var(--accent); }\n<\/style>\n<\/head>\n<body>\n<div class=\"wrap\">\n <div class=\"grid\">\n <form id=\"calc\" class=\"card\" novalidate>\n <fieldset>\n <legend>Welding parameters<\/legend>\n <p id=\"form-error\" class=\"form-error\" role=\"alert\"><\/p>\n\n <div class=\"field\" id=\"f-voltage\">\n <label for=\"voltage\">Arc voltage<\/label>\n <div class=\"control\">\n <input id=\"voltage\" name=\"voltage\" type=\"number\" inputmode=\"decimal\" min=\"0\" step=\"any\" required placeholder=\"e.g. 24\" aria-describedby=\"voltage-err\">\n <span class=\"unit\" aria-hidden=\"true\">V<\/span>\n <\/div>\n <span class=\"err\" id=\"voltage-err\"><\/span>\n <\/div>\n\n <div class=\"field\" id=\"f-current\">\n <label for=\"current\">Welding current<\/label>\n <div class=\"control\">\n <input id=\"current\" name=\"current\" type=\"number\" inputmode=\"decimal\" min=\"0\" step=\"any\" required placeholder=\"e.g. 200\" aria-describedby=\"current-err\">\n <span class=\"unit\" aria-hidden=\"true\">A<\/span>\n <\/div>\n <span class=\"err\" id=\"current-err\"><\/span>\n <\/div>\n\n <div class=\"field\" id=\"f-travel-speed\">\n <label for=\"travel-speed\">Travel speed<\/label>\n <div class=\"control\">\n <input id=\"travel-speed\" name=\"travel-speed\" type=\"number\" inputmode=\"decimal\" min=\"0\" step=\"any\" required placeholder=\"e.g. 300\" aria-describedby=\"travel-speed-err\">\n <select id=\"speed-unit\" name=\"speed-unit\" aria-label=\"Travel speed unit\">\n <option value=\"mm_min\">mm\/min<\/option>\n <option value=\"cm_min\">cm\/min<\/option>\n <option value=\"m_min\">m\/min<\/option>\n <option value=\"in_min\">in\/min<\/option>\n <\/select>\n <\/div>\n <span class=\"err\" id=\"travel-speed-err\"><\/span>\n <\/div>\n\n <div class=\"field\" id=\"f-efficiency\">\n <label for=\"efficiency\">Process thermal efficiency<\/label>\n <div class=\"control\">\n <input id=\"efficiency\" name=\"efficiency\" type=\"number\" inputmode=\"decimal\" min=\"1\" max=\"100\" step=\"any\" value=\"80\" required aria-describedby=\"efficiency-hint efficiency-err\">\n <span class=\"unit\" aria-hidden=\"true\">%<\/span>\n <\/div>\n <small class=\"hint\" id=\"efficiency-hint\">Enter an efficiency value appropriate for the welding process. Do not assume a universal value. Allowed range: 1\u2013100%.<\/small>\n <span class=\"err\" id=\"efficiency-err\"><\/span>\n <\/div>\n <\/fieldset>\n\n <div class=\"actions\">\n <button type=\"submit\" class=\"btn-primary\">Calculate<\/button>\n <\/div>\n <\/form>\n\n <div class=\"card results\" id=\"results\" aria-live=\"polite\" role=\"status\" hidden>\n <h2>Results<\/h2>\n <p class=\"sub\" id=\"result-sub\"><\/p>\n <ul>\n <li class=\"primary\"><span class=\"label\">Estimated heat input<\/span><span class=\"value\" id=\"r-kjmm\">\u2014<small>kJ\/mm<\/small><\/span><\/li>\n <li><span class=\"label\">Estimated heat input<\/span><span class=\"value\" id=\"r-kjcm\">\u2014<small>kJ\/cm<\/small><\/span><\/li>\n <li><span class=\"label\">Estimated heat input<\/span><span class=\"value\" id=\"r-jmm\">\u2014<small>J\/mm<\/small><\/span><\/li>\n <li><span class=\"label\">Travel speed (converted)<\/span><span class=\"value\" id=\"r-speed\">\u2014<small>mm\/s<\/small><\/span><\/li>\n <\/ul>\n <p class=\"estimate-note\">Results are estimates of arc heat input only. They do not replace a qualified welding procedure.<\/p>\n <\/div>\n <\/div>\n\n<\/div>\n\n<script>\n(function () {\n \"use strict\";\n var form = document.getElementById(\"calc\");\n var formError = document.getElementById(\"form-error\");\n var sub = document.getElementById(\"result-sub\");\n var results = document.getElementById(\"results\");\n\n \/\/ Factor to convert the selected unit to mm\/s\n var TO_MM_S = {\n mm_min: 1 \/ 60,\n cm_min: 10 \/ 60,\n m_min: 1000 \/ 60,\n in_min: 25.4 \/ 60\n };\n var UNIT_LABEL = { mm_min: \"mm\/min\", cm_min: \"cm\/min\", m_min: \"m\/min\", in_min: \"in\/min\" };\n\n var fields = {\n voltage: { name: \"Arc voltage\", min: 0, exclusiveMin: true },\n current: { name: \"Welding current\", min: 0, exclusiveMin: true },\n \"travel-speed\": { name: \"Travel speed\", min: 0, exclusiveMin: true },\n efficiency: { name: \"Process thermal efficiency\", min: 1, max: 100 }\n };\n\n function setError(id, msg) {\n var wrap = document.getElementById(\"f-\" + id);\n var input = document.getElementById(id);\n var err = document.getElementById(id + \"-err\");\n if (msg) {\n wrap.setAttribute(\"data-invalid\", \"true\");\n input.setAttribute(\"aria-invalid\", \"true\");\n err.textContent = msg;\n } else {\n wrap.removeAttribute(\"data-invalid\");\n input.removeAttribute(\"aria-invalid\");\n err.textContent = \"\";\n }\n }\n\n function readField(id) {\n var cfg = fields[id];\n var raw = document.getElementById(id).value.trim();\n if (raw === \"\") return { error: cfg.name + \" is required.\" };\n var v = Number(raw);\n if (!isFinite(v)) return { error: cfg.name + \" must be a valid number.\" };\n if (cfg.exclusiveMin && v <= cfg.min) return { error: cfg.name + \" must be greater than 0.\" };\n if (cfg.max !== undefined && (v < cfg.min || v > cfg.max)) {\n return { error: cfg.name + \" must be between \" + cfg.min + \"% and \" + cfg.max + \"%.\" };\n }\n return { value: v };\n }\n\n function fmt(n) {\n \/\/ Three decimal places; switch to more significant figures for very small numbers\n if (n !== 0 && Math.abs(n) < 0.001) return n.toPrecision(3);\n return n.toLocaleString(\"en-US\", { minimumFractionDigits: 3, maximumFractionDigits: 3 });\n }\n\n function setValue(id, text, unit) {\n document.getElementById(id).innerHTML = text + \"<small>\" + unit + \"<\/small>\";\n }\n\n function clearResults() {\n setValue(\"r-kjmm\", \"\u2014\", \"kJ\/mm\");\n setValue(\"r-kjcm\", \"\u2014\", \"kJ\/cm\");\n setValue(\"r-jmm\", \"\u2014\", \"J\/mm\");\n setValue(\"r-speed\", \"\u2014\", \"mm\/s\");\n }\n\n form.addEventListener(\"submit\", function (e) {\n e.preventDefault();\n var values = {}, firstBad = null, count = 0;\n Object.keys(fields).forEach(function (id) {\n var r = readField(id);\n setError(id, r.error || \"\");\n if (r.error) { count++; if (!firstBad) firstBad = id; }\n else values[id] = r.value;\n });\n\n if (firstBad) {\n formError.textContent = count === 1 ? \"Please correct the highlighted field.\" : \"Please correct the \" + count + \" highlighted fields.\";\n formError.classList.add(\"show\");\n results.hidden = true;\n document.getElementById(firstBad).focus();\n return;\n }\n formError.classList.remove(\"show\");\n formError.textContent = \"\";\n\n var unit = document.getElementById(\"speed-unit\").value;\n var speedMmS = values[\"travel-speed\"] * TO_MM_S[unit];\n var speedMmMin = speedMmS * 60;\n\n if (!(speedMmS > 0) || !isFinite(speedMmS)) {\n setError(\"travel-speed\", \"Travel speed must be greater than 0.\");\n clearResults();\n return;\n }\n\n var eff = values.efficiency \/ 100;\n var V = values.voltage, I = values.current;\n var kJmm = (V * I * eff) \/ (speedMmS * 1000);\n var kJcm = kJmm * 10;\n var Jmm = (V * I * eff * 60) \/ speedMmMin;\n\n setValue(\"r-kjmm\", fmt(kJmm), \"kJ\/mm\");\n setValue(\"r-kjcm\", fmt(kJcm), \"kJ\/cm\");\n setValue(\"r-jmm\", fmt(Jmm), \"J\/mm\");\n setValue(\"r-speed\", fmt(speedMmS), \"mm\/s\");\n sub.textContent = \"Estimate for \" + V + \" V, \" + I + \" A, \" + values[\"travel-speed\"] + \" \" +\n UNIT_LABEL[unit] + \", \" + values.efficiency + \"% efficiency.\";\n results.hidden = false;\n });\n\n \/\/ Clear a field's error as the user corrects it\n Object.keys(fields).forEach(function (id) {\n document.getElementById(id).addEventListener(\"input\", function () {\n if (document.getElementById(\"f-\" + id).hasAttribute(\"data-invalid\")) {\n var r = readField(id);\n if (!r.error) setError(id, \"\");\n }\n });\n });\n})();\n<\/script>\n<\/body>\n<\/html>\n","protected":false},"excerpt":{"rendered":"<p>The Welding Heat Input Calculator estimates heat input per unit length using arc voltage, welding current, travel speed, and process efficiency. 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{"id":25097,"date":"2026-11-10T06:29:16","date_gmt":"2026-11-10T06:29:16","guid":{"rendered":"https:\/\/www.mechstream.com\/?p=25097"},"modified":"2026-11-10T06:29:19","modified_gmt":"2026-11-10T06:29:19","slug":"welding-heat-input-calculator","status":"publish","type":"post","link":"https:\/\/www.mechstream.com\/ar\/welding-heat-input-calculator\/","title":{"rendered":"Welding Heat Input Calculator"},"content":{"rendered":"\n

The Welding Heat Input Calculator estimates heat input per unit length using arc voltage, welding current, travel speed, and process efficiency. Convert results into kJ\/mm, kJ\/cm, or J\/mm to support welding process planning and parameter comparison. Use this calculator as a reference estimate; actual heat input depends on the welding process and procedure.<\/p>\n\n\n\n\n\n\n\n\nWelding Heat Input Calculator<\/title>\n<meta name=\"description\" content=\"Estimate welding heat input per unit length (kJ\/mm, kJ\/cm, J\/mm) from arc voltage, welding current, travel speed and process thermal efficiency.\">\n<style>\n :root {\n --bg: #ffffff;\n --field-bg: #f3f5f8;\n --surface: #ffffff;\n --ink: #1c1d1f;\n --muted: #5a5d63;\n --line: #d6dbe3;\n --accent: #1d4ed8;\n --accent-ink: #ffffff;\n --accent-soft: #eef3ff;\n --error: #b42318;\n --error-soft: #fdecea;\n --focus: #1e40af;\n --radius: 10px;\n }\n @media (prefers-color-scheme: dark) {\n :root:not([data-theme=\"light\"]) {\n --bg: #141518;\n --field-bg: #23262b;\n --surface: #1d1f23;\n --ink: #ecebe8;\n --muted: #a4a7ad;\n --line: #34373d;\n --accent: #60a5fa;\n --accent-ink: #0b1a33;\n --accent-soft: #15233d;\n --error: #f97066;\n --error-soft: #2d1716;\n --focus: #bfd4ff;\n }\n }\n * { box-sizing: border-box; }\n body {\n margin: 0;\n background: var(--bg);\n color: var(--ink);\n font: 16px\/1.55 system-ui, -apple-system, \"Segoe UI\", Roboto, \"Helvetica Neue\", Arial, sans-serif;\n }\n .wrap { max-width: 640px; margin: 0 auto; padding: 32px 16px 48px; }\n header h1 { margin: 0 0 6px; font-size: clamp(1.6rem, 4vw, 2.2rem); letter-spacing: -0.01em; }\n header p { margin: 0; color: var(--muted); max-width: 62ch; }\n .tag {\n display: inline-block; margin-bottom: 10px; padding: 2px 10px;\n border: 1px solid var(--accent); border-radius: 999px;\n color: var(--accent); font-size: .78rem; font-weight: 600; letter-spacing: .06em; text-transform: uppercase;\n }\n .grid { display: grid; grid-template-columns: 1fr; gap: 20px; }\n .card {\n background: var(--surface); border: 1px solid var(--line);\n border-radius: var(--radius); padding: 22px;\n }\n fieldset { border: 0; margin: 0; padding: 0; min-width: 0; }\n .grid > * { min-width: 0; }\n legend { font-weight: 700; font-size: 1.05rem; margin-bottom: 14px; padding: 0; }\n .field { margin-bottom: 16px; }\n .field label { display: block; font-weight: 600; margin-bottom: 6px; }\n .control { display: flex; align-items: stretch; }\n .control input, .control select {\n font: inherit; color: var(--ink); background: var(--surface);\n border: 1px solid var(--line); padding: 10px 12px; min-height: 44px;\n }\n .control input { flex: 1; min-width: 0; border-radius: 8px 0 0 8px; }\n .control .unit {\n display: flex; align-items: center; padding: 0 14px; min-width: 64px; justify-content: center;\n border: 1px solid var(--line); border-left: 0; border-radius: 0 8px 8px 0;\n background: var(--field-bg); color: var(--muted); font-weight: 600;\n }\n .control select { border-left: 0; border-radius: 0 8px 8px 0; background: var(--field-bg); font-weight: 600; cursor: pointer; }\n input:focus-visible, select:focus-visible, button:focus-visible {\n outline: 3px solid var(--focus); outline-offset: 2px;\n }\n .field[data-invalid=\"true\"] input { border-color: var(--error); background: var(--error-soft); }\n .hint { display: block; margin-top: 6px; color: var(--muted); font-size: .88rem; }\n .err { display: none; margin-top: 6px; color: var(--error); font-size: .88rem; font-weight: 600; }\n .field[data-invalid=\"true\"] .err { display: block; }\n .actions { display: flex; justify-content: center; margin-top: 8px; }\n .btn-primary { min-width: 160px; }\n button {\n font: inherit; font-weight: 700; min-height: 44px; padding: 10px 20px;\n border-radius: 8px; cursor: pointer; border: 1px solid transparent;\n }\n .btn-primary { background: var(--accent); color: var(--accent-ink); }\n .btn-primary:hover { filter: brightness(1.07); }\n .btn-ghost { background: transparent; color: var(--ink); border-color: var(--line); }\n .btn-ghost:hover { background: var(--bg); }\n\n .results h2 { margin: 0 0 4px; font-size: 1.05rem; }\n .results .sub { margin: 0 0 16px; min-height: 0; color: var(--muted); font-size: .9rem; }\n .results ul { list-style: none; margin: 0; padding: 0; }\n .results li {\n display: flex; justify-content: space-between; align-items: baseline; gap: 12px;\n padding: 12px 0; border-top: 1px solid var(--line);\n }\n .results li:first-child { border-top: 0; }\n .results .label { color: var(--muted); font-size: .92rem; }\n .results .value { font-variant-numeric: tabular-nums; font-weight: 700; font-size: 1.15rem; text-align: right; white-space: nowrap; }\n .results .value small { font-weight: 600; color: var(--muted); font-size: .8rem; margin-left: 4px; }\n .results li.primary {\n background: var(--accent-soft); border-radius: 8px; padding: 14px; border-top: 0; margin-bottom: 6px;\n }\n .results li.primary .value { font-size: 1.6rem; color: var(--accent); }\n .results li.primary + li { border-top: 0; }\n .estimate-note {\n margin: 14px 0 0; font-size: .85rem; color: var(--muted);\n border-left: 3px solid var(--accent); padding-left: 10px;\n }\n .form-error {\n display: none; margin: 0 0 14px; padding: 10px 12px; border-radius: 8px;\n background: var(--error-soft); color: var(--error); font-weight: 600; font-size: .92rem;\n }\n .form-error.show { display: block; }\n\n section.info { margin-top: 20px; }\n section.info h2 { font-size: 1.15rem; margin: 0 0 10px; }\n section.info p, section.info li { color: var(--ink); }\n .formula {\n display: block; overflow-x: auto; margin: 10px 0; padding: 12px 14px;\n background: var(--bg); border: 1px solid var(--line); border-radius: 8px;\n font: .92rem\/1.5 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; white-space: normal; overflow-wrap: anywhere;\n }\n table { width: 100%; border-collapse: collapse; font-size: .92rem; margin-top: 8px; }\n th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--line); }\n th { color: var(--muted); font-weight: 600; }\n .disclaimer { background: var(--accent-soft); border-color: transparent; }\n .disclaimer strong { color: var(--accent); }\n<\/style>\n<\/head>\n<body>\n<div class=\"wrap\">\n <div class=\"grid\">\n <form id=\"calc\" class=\"card\" novalidate>\n <fieldset>\n <legend>Welding parameters<\/legend>\n <p id=\"form-error\" class=\"form-error\" role=\"alert\"><\/p>\n\n <div class=\"field\" id=\"f-voltage\">\n <label for=\"voltage\">Arc voltage<\/label>\n <div class=\"control\">\n <input id=\"voltage\" name=\"voltage\" type=\"number\" inputmode=\"decimal\" min=\"0\" step=\"any\" required placeholder=\"e.g. 24\" aria-describedby=\"voltage-err\">\n <span class=\"unit\" aria-hidden=\"true\">V<\/span>\n <\/div>\n <span class=\"err\" id=\"voltage-err\"><\/span>\n <\/div>\n\n <div class=\"field\" id=\"f-current\">\n <label for=\"current\">Welding current<\/label>\n <div class=\"control\">\n <input id=\"current\" name=\"current\" type=\"number\" inputmode=\"decimal\" min=\"0\" step=\"any\" required placeholder=\"e.g. 200\" aria-describedby=\"current-err\">\n <span class=\"unit\" aria-hidden=\"true\">A<\/span>\n <\/div>\n <span class=\"err\" id=\"current-err\"><\/span>\n <\/div>\n\n <div class=\"field\" id=\"f-travel-speed\">\n <label for=\"travel-speed\">Travel speed<\/label>\n <div class=\"control\">\n <input id=\"travel-speed\" name=\"travel-speed\" type=\"number\" inputmode=\"decimal\" min=\"0\" step=\"any\" required placeholder=\"e.g. 300\" aria-describedby=\"travel-speed-err\">\n <select id=\"speed-unit\" name=\"speed-unit\" aria-label=\"Travel speed unit\">\n <option value=\"mm_min\">mm\/min<\/option>\n <option value=\"cm_min\">cm\/min<\/option>\n <option value=\"m_min\">m\/min<\/option>\n <option value=\"in_min\">in\/min<\/option>\n <\/select>\n <\/div>\n <span class=\"err\" id=\"travel-speed-err\"><\/span>\n <\/div>\n\n <div class=\"field\" id=\"f-efficiency\">\n <label for=\"efficiency\">Process thermal efficiency<\/label>\n <div class=\"control\">\n <input id=\"efficiency\" name=\"efficiency\" type=\"number\" inputmode=\"decimal\" min=\"1\" max=\"100\" step=\"any\" value=\"80\" required aria-describedby=\"efficiency-hint efficiency-err\">\n <span class=\"unit\" aria-hidden=\"true\">%<\/span>\n <\/div>\n <small class=\"hint\" id=\"efficiency-hint\">Enter an efficiency value appropriate for the welding process. Do not assume a universal value. Allowed range: 1\u2013100%.<\/small>\n <span class=\"err\" id=\"efficiency-err\"><\/span>\n <\/div>\n <\/fieldset>\n\n <div class=\"actions\">\n <button type=\"submit\" class=\"btn-primary\">Calculate<\/button>\n <\/div>\n <\/form>\n\n <div class=\"card results\" id=\"results\" aria-live=\"polite\" role=\"status\" hidden>\n <h2>Results<\/h2>\n <p class=\"sub\" id=\"result-sub\"><\/p>\n <ul>\n <li class=\"primary\"><span class=\"label\">Estimated heat input<\/span><span class=\"value\" id=\"r-kjmm\">\u2014<small>kJ\/mm<\/small><\/span><\/li>\n <li><span class=\"label\">Estimated heat input<\/span><span class=\"value\" id=\"r-kjcm\">\u2014<small>kJ\/cm<\/small><\/span><\/li>\n <li><span class=\"label\">Estimated heat input<\/span><span class=\"value\" id=\"r-jmm\">\u2014<small>J\/mm<\/small><\/span><\/li>\n <li><span class=\"label\">Travel speed (converted)<\/span><span class=\"value\" id=\"r-speed\">\u2014<small>mm\/s<\/small><\/span><\/li>\n <\/ul>\n <p class=\"estimate-note\">Results are estimates of arc heat input only. They do not replace a qualified welding procedure.<\/p>\n <\/div>\n <\/div>\n\n<\/div>\n\n<script>\n(function () {\n \"use strict\";\n var form = document.getElementById(\"calc\");\n var formError = document.getElementById(\"form-error\");\n var sub = document.getElementById(\"result-sub\");\n var results = document.getElementById(\"results\");\n\n \/\/ Factor to convert the selected unit to mm\/s\n var TO_MM_S = {\n mm_min: 1 \/ 60,\n cm_min: 10 \/ 60,\n m_min: 1000 \/ 60,\n in_min: 25.4 \/ 60\n };\n var UNIT_LABEL = { mm_min: \"mm\/min\", cm_min: \"cm\/min\", m_min: \"m\/min\", in_min: \"in\/min\" };\n\n var fields = {\n voltage: { name: \"Arc voltage\", min: 0, exclusiveMin: true },\n current: { name: \"Welding current\", min: 0, exclusiveMin: true },\n \"travel-speed\": { name: \"Travel speed\", min: 0, exclusiveMin: true },\n efficiency: { name: \"Process thermal efficiency\", min: 1, max: 100 }\n };\n\n function setError(id, msg) {\n var wrap = document.getElementById(\"f-\" + id);\n var input = document.getElementById(id);\n var err = document.getElementById(id + \"-err\");\n if (msg) {\n wrap.setAttribute(\"data-invalid\", \"true\");\n input.setAttribute(\"aria-invalid\", \"true\");\n err.textContent = msg;\n } else {\n wrap.removeAttribute(\"data-invalid\");\n input.removeAttribute(\"aria-invalid\");\n err.textContent = \"\";\n }\n }\n\n function readField(id) {\n var cfg = fields[id];\n var raw = document.getElementById(id).value.trim();\n if (raw === \"\") return { error: cfg.name + \" is required.\" };\n var v = Number(raw);\n if (!isFinite(v)) return { error: cfg.name + \" must be a valid number.\" };\n if (cfg.exclusiveMin && v <= cfg.min) return { error: cfg.name + \" must be greater than 0.\" };\n if (cfg.max !== undefined && (v < cfg.min || v > cfg.max)) {\n return { error: cfg.name + \" must be between \" + cfg.min + \"% and \" + cfg.max + \"%.\" };\n }\n return { value: v };\n }\n\n function fmt(n) {\n \/\/ Three decimal places; switch to more significant figures for very small numbers\n if (n !== 0 && Math.abs(n) < 0.001) return n.toPrecision(3);\n return n.toLocaleString(\"en-US\", { minimumFractionDigits: 3, maximumFractionDigits: 3 });\n }\n\n function setValue(id, text, unit) {\n document.getElementById(id).innerHTML = text + \"<small>\" + unit + \"<\/small>\";\n }\n\n function clearResults() {\n setValue(\"r-kjmm\", \"\u2014\", \"kJ\/mm\");\n setValue(\"r-kjcm\", \"\u2014\", \"kJ\/cm\");\n setValue(\"r-jmm\", \"\u2014\", \"J\/mm\");\n setValue(\"r-speed\", \"\u2014\", \"mm\/s\");\n }\n\n form.addEventListener(\"submit\", function (e) {\n e.preventDefault();\n var values = {}, firstBad = null, count = 0;\n Object.keys(fields).forEach(function (id) {\n var r = readField(id);\n setError(id, r.error || \"\");\n if (r.error) { count++; if (!firstBad) firstBad = id; }\n else values[id] = r.value;\n });\n\n if (firstBad) {\n formError.textContent = count === 1 ? \"Please correct the highlighted field.\" : \"Please correct the \" + count + \" highlighted fields.\";\n formError.classList.add(\"show\");\n results.hidden = true;\n document.getElementById(firstBad).focus();\n return;\n }\n formError.classList.remove(\"show\");\n formError.textContent = \"\";\n\n var unit = document.getElementById(\"speed-unit\").value;\n var speedMmS = values[\"travel-speed\"] * TO_MM_S[unit];\n var speedMmMin = speedMmS * 60;\n\n if (!(speedMmS > 0) || !isFinite(speedMmS)) {\n setError(\"travel-speed\", \"Travel speed must be greater than 0.\");\n clearResults();\n return;\n }\n\n var eff = values.efficiency \/ 100;\n var V = values.voltage, I = values.current;\n var kJmm = (V * I * eff) \/ (speedMmS * 1000);\n var kJcm = kJmm * 10;\n var Jmm = (V * I * eff * 60) \/ speedMmMin;\n\n setValue(\"r-kjmm\", fmt(kJmm), \"kJ\/mm\");\n setValue(\"r-kjcm\", fmt(kJcm), \"kJ\/cm\");\n setValue(\"r-jmm\", fmt(Jmm), \"J\/mm\");\n setValue(\"r-speed\", fmt(speedMmS), \"mm\/s\");\n sub.textContent = \"Estimate for \" + V + \" V, \" + I + \" A, \" + values[\"travel-speed\"] + \" \" +\n UNIT_LABEL[unit] + \", \" + values.efficiency + \"% efficiency.\";\n results.hidden = false;\n });\n\n \/\/ Clear a field's error as the user corrects it\n Object.keys(fields).forEach(function (id) {\n document.getElementById(id).addEventListener(\"input\", function () {\n if (document.getElementById(\"f-\" + id).hasAttribute(\"data-invalid\")) {\n var r = readField(id);\n if (!r.error) setError(id, \"\");\n }\n });\n });\n})();\n<\/script>\n<\/body>\n<\/html>\n","protected":false},"excerpt":{"rendered":"<p>The Welding Heat Input Calculator estimates heat input per unit length using arc voltage, welding current, travel speed, and process efficiency. Convert results into kJ\/mm,…<\/p>","protected":false},"author":2,"featured_media":25098,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"pmpro_default_level":"","_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_hide_featured_image":false,"_jetpack_featured_image_duplicate_dismissed":0,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[8808],"tags":[8851,8853,8793,8852],"class_list":["post-25097","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-manufacturing-and-processes","tag-heat-input","tag-weld-planning","tag-welding-calculator","tag-welding-parameters","pmpro-has-access"],"acf":[],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"https:\/\/www.mechstream.com\/wp-content\/uploads\/2026\/11\/Welding-Heat-Input-Calculator.png","_links":{"self":[{"href":"https:\/\/www.mechstream.com\/ar\/wp-json\/wp\/v2\/posts\/25097","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.mechstream.com\/ar\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.mechstream.com\/ar\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.mechstream.com\/ar\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.mechstream.com\/ar\/wp-json\/wp\/v2\/comments?post=25097"}],"version-history":[{"count":1,"href":"https:\/\/www.mechstream.com\/ar\/wp-json\/wp\/v2\/posts\/25097\/revisions"}],"predecessor-version":[{"id":25099,"href":"https:\/\/www.mechstream.com\/ar\/wp-json\/wp\/v2\/posts\/25097\/revisions\/25099"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.mechstream.com\/ar\/wp-json\/wp\/v2\/media\/25098"}],"wp:attachment":[{"href":"https:\/\/www.mechstream.com\/ar\/wp-json\/wp\/v2\/media?parent=25097"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.mechstream.com\/ar\/wp-json\/wp\/v2\/categories?post=25097"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.mechstream.com\/ar\/wp-json\/wp\/v2\/tags?post=25097"}],"curies":[{"name":"\u0648\u0648\u0631\u062f\u0628\u0631\u064a\u0633","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}