{"id":7317,"date":"2026-10-09T04:30:00","date_gmt":"2026-10-09T04:30:00","guid":{"rendered":"https:\/\/www.cruxweld.com\/blog\/?p=7317"},"modified":"2026-10-07T11:47:10","modified_gmt":"2026-10-07T11:47:10","slug":"2-in-1-spot-and-seam-welder-duoflex-20k-guide","status":"publish","type":"post","link":"https:\/\/www.cruxweld.com\/blog\/2-in-1-spot-and-seam-welder-duoflex-20k-guide\/","title":{"rendered":"2-in-1 Spot and Seam Welder: How the DuoFlex 20K Works"},"content":{"rendered":"<style>.cwd .d1{margin:0 0 28px;border-radius:18px;overflow:hidden;background:linear-gradient(135deg,#0b2545 0%,#13315c 55%,#1e3a8a 100%);color:#fff;display:flex;flex-wrap:wrap;align-items:stretch}.cwd .d2{flex:1 1 320px;padding:30px 28px}.cwd .d3{display:inline-block;background:rgba(245,158,11,.18);border:1px solid rgba(245,158,11,.5);color:#fde68a;border-radius:999px;padding:5px 12px;font-size:12px;letter-spacing:.12em;text-transform:uppercase;font-weight:700}.cwd .d4{font-size:clamp(24px,5vw,32px);line-height:1.15;font-weight:800;margin:16px 0 12px;color:#fff}.cwd .d5{color:#f59e0b}.cwd .d6{font-size:16px;line-height:1.6;color:#dbeafe;margin:0 0 20px}.cwd .d7{display:flex;flex-wrap:wrap;gap:10px}.cwd .d8{flex:1 1 90px;background:rgba(255,255,255,.10);border:1px solid rgba(255,255,255,.22);border-radius:12px;padding:10px 12px;text-align:center}.cwd .d9{font-size:21px;font-weight:800;color:#fff}.cwd .d10{font-size:12px;color:#bfdbfe}.cwd .d11{flex:1 1 280px;background:#ffffff;display:flex;align-items:center;justify-content:center;padding:14px}.cwd .d12{width:100%;max-width:420px;height:auto;display:block;margin:0 auto;border-radius:0}.cwd .d13{font-size:16.5px;line-height:1.75;color:#1e293b;margin:0 0 16px}.cwd .d14{margin:44px 0 16px;display:flex;flex-direction:column}.cwd .d15{order:1;font-size:12px;letter-spacing:.14em;text-transform:uppercase;font-weight:700;color:#b45309;margin:0 0 6px}.cwd .d16{order:2;margin:0;font-size:26px;line-height:1.25;color:#0f172a}.cwd .d17{margin:6px 0 16px;padding:12px;border:1px solid #e2e8f0;border-radius:16px;background:#fff}.cwd .d18{display:block;max-width:720px;margin:0 auto}.cwd .d19{display:flex;flex-wrap:wrap;gap:16px}.cwd .d20{flex:1 1 280px;border:1px solid #e2e8f0;border-radius:16px;overflow:hidden;background:#fff}.cwd .d21{aspect-ratio:4\/3;overflow:hidden;background:#fff}.cwd .d22{width:100%;height:100%;object-fit:cover;display:block;margin:0}.cwd .d23{padding:16px 18px}.cwd .d24{font-weight:800;font-size:18px;color:#0f172a;margin-bottom:8px}.cwd .d25{font-size:14.5px;color:#334155;line-height:1.6;margin:4px 0}.cwd .d26{vertical-align:-3px}.cwd .d27{display:flex;flex-wrap:wrap;gap:14px}.cwd .d28{flex:1 1 200px;background:#fffbeb;border:1px solid #fde68a;border-radius:14px;padding:18px}.cwd .d29{font-size:28px;font-weight:800;color:#b45309;margin-bottom:6px}.cwd .d30{font-weight:800;font-size:17px;color:#0f172a;margin-bottom:6px}.cwd .d31{font-size:14.5px;line-height:1.6;color:#475569}.cwd .d32{color:#1565c0;font-weight:700}.cwd .d33{flex:1 1 220px;border:1px solid #e2e8f0;border-radius:16px;overflow:hidden;background:#fff;box-shadow:0 8px 20px rgba(15,23,42,.06)}.cwd .d34{aspect-ratio:1\/1;overflow:hidden;background:#fff}.cwd .d35{padding:14px 16px}.cwd .d36{display:inline-block;background:#1565c0;color:#fff;border-radius:999px;padding:3px 10px;font-size:11.5px;font-weight:700;letter-spacing:.06em;text-transform:uppercase}.cwd .d37{font-weight:800;font-size:17px;color:#0f172a;margin:8px 0 6px}.cwd .d38{display:inline-block;background:#b45309;color:#fff;border-radius:999px;padding:3px 10px;font-size:11.5px;font-weight:700;letter-spacing:.06em;text-transform:uppercase}.cwd .d39{display:flex;flex-wrap:wrap;gap:20px;align-items:center}.cwd .d40{flex:1 1 280px}.cwd .d41{margin:22px auto;max-width:100%;text-align:center}.cwd .d42{width:100%;height:auto;border-radius:14px;border:1px solid #e2e8f0;box-shadow:0 10px 30px rgba(11,37,69,.10);display:block;margin:0 auto}.cwd .d43{font-size:13.5px;color:#475569;margin-top:10px}.cwd .d44{display:flex;gap:12px;align-items:flex-start;padding:10px 0;border-bottom:1px dashed #e2e8f0}.cwd .d45{flex:0 0 10px;height:10px;border-radius:50%;background:#f59e0b;margin-top:7px}.cwd .d46{font-weight:800;color:#0f172a;font-size:15.5px}.cwd .d47{color:#475569;font-size:14px;line-height:1.55}.cwd .d48{flex:1 1 260px;border-radius:14px;padding:18px;background:#1565c0;color:#fff;box-shadow:0 8px 20px rgba(15,23,42,.10)}.cwd .d49{font-size:20px;font-weight:800;margin-bottom:6px}.cwd .d50{font-size:15px;line-height:1.6;opacity:.95}.cwd .d51{flex:1 1 260px;border-radius:14px;padding:18px;background:#b45309;color:#fff;box-shadow:0 8px 20px rgba(15,23,42,.10)}.cwd .d52{overflow-x:auto;margin:10px 0 6px;border:1px solid #e2e8f0;border-radius:14px}.cwd .d53{width:100%;min-width:520px;border-collapse:collapse;background:#fff}.cwd .d54{text-align:left;padding:14px 10px;background:#f4f8fc;border-bottom:2px solid #e2e8f0}.cwd .d55{text-align:left;padding:14px 10px;background:#f4f8fc;font-size:14px;color:#0f172a;border-bottom:2px solid #e2e8f0}.cwd .d56{text-align:left;padding:14px 10px;background:#0b2545;font-size:14px;color:#fff;border-bottom:2px solid #0b2545}.cwd .d57{padding:12px 10px;border-bottom:1px solid #e2e8f0;font-size:14.5px;font-weight:700;color:#0f172a}.cwd .d58{padding:12px 10px;border-bottom:1px solid #e2e8f0;font-size:14.5px;color:#1e293b}.cwd .d59{padding:12px 10px;border-bottom:1px solid #e2e8f0;font-size:14.5px;color:#0f172a;background:#fffbeb;font-weight:600}.cwd .d60{flex:1 1 220px;border:1px solid #e2e8f0;border-top:5px solid #1565c0;border-radius:14px;padding:18px;background:#fff}.cwd .d61{font-weight:800;font-size:17px;color:#0f172a}.cwd .d62{font-size:13px;color:#b45309;font-weight:700;margin:4px 0 8px}.cwd .d63{flex:1 1 220px;border:1px solid #e2e8f0;border-top:5px solid #f59e0b;border-radius:14px;padding:18px;background:#fff}.cwd .d64{display:flex;flex-wrap:wrap;gap:12px}.cwd .d65{flex:1 1 200px;background:#f4f8fc;border:1px solid #e2e8f0;border-radius:12px;padding:14px 16px}.cwd .d66{font-weight:800;color:#0b2545;font-size:15.5px}.cwd .d67{color:#475569;font-size:14px;margin-top:3px}.cwd .d68{display:flex;flex-wrap:wrap;gap:16px;justify-content:center}.cwd .d69{flex:1 1 300px;max-width:440px}.cwd .d70{position:relative;padding-top:56.25%;border-radius:14px;overflow:hidden;box-shadow:0 10px 30px rgba(11,37,69,.15)}.cwd .d71{position:absolute;top:0;left:0;width:100%;height:100%;border:0}.cwd .d72{font-size:13.5px;color:#475569;text-align:center;margin-top:8px}.cwd .d73{flex:1 1 230px;border:1px solid #e2e8f0;border-radius:12px;padding:12px 14px;background:#fff}.cwd .d74{font-size:12px;text-transform:uppercase;letter-spacing:.08em;color:#475569;font-weight:700}.cwd .d75{font-size:15px;color:#0f172a;font-weight:700;margin-top:4px}.cwd .d76{font-size:16.5px;line-height:1.75;color:#1e293b;margin:0 0 16px;margin-top:14px}.cwd .d77{flex:1 1 240px}.cwd .d78{margin:22px auto;max-width:360px;text-align:center}.cwd .d79{flex:1 1 300px}.cwd .d80{font-size:15px;color:#1e293b;margin:6px 0}.cwd .d81{margin:40px 0 10px;border-radius:18px;overflow:hidden;background:linear-gradient(135deg,#0b2545,#1e3a8a);color:#fff;display:flex;flex-wrap:wrap;align-items:center}.cwd .d82{flex:1 1 300px;padding:28px}.cwd .d83{font-size:26px;font-weight:800;line-height:1.2;color:#fff}.cwd .d84{font-size:15.5px;line-height:1.6;color:#dbeafe;margin:10px 0 18px}.cwd .d85{display:flex;flex-wrap:wrap;gap:10px;align-items:center}.cwd .d86{display:inline-block;background:#ff6a00;color:#fff;padding:13px 24px;border-radius:10px;font-weight:800;text-decoration:none}.cwd .d87{display:inline-block;color:#fff;padding:12px 18px;border-radius:10px;font-weight:700;text-decoration:none;border:1px solid rgba(255,255,255,.45)}.cwd .d88{font-size:12.5px;color:#bfdbfe;margin-top:14px}.cwd .d89{flex:1 1 260px;background:#fff;padding:14px;display:flex;justify-content:center}.cwd .d90{width:100%;max-width:360px;height:auto;display:block;margin:0 auto;border-radius:0}.cwd .d91{border:1px solid #e2e8f0;border-radius:12px;margin:0 0 10px;background:#fff}.cwd .d92{cursor:pointer;padding:14px 16px;font-weight:800;color:#0f172a;font-size:16px}.cwd .d93{padding:0 16px 14px;color:#334155;font-size:15px;line-height:1.7}.cwd img{max-width:100%}.cwd details summary{list-style:revert}<\/style>\n<div class=\"cwd\">\n<div class=\"d1\">\n<div class=\"d2\">\n<div class=\"d3\">Resistance welding &middot; Sheet metal<\/div>\n<div class=\"d4\">Spot welds <span class=\"d5\">and<\/span> seam welds.<br \/>One machine.<\/div>\n<div class=\"d6\">How a 2-in-1 spot and seam welder saves floor space, training time and setup headaches &mdash; and how the DuoFlex&nbsp;20K does it.<\/div>\n<div class=\"d7\">\n<div class=\"d8\">\n<div class=\"d9\">20 kVA<\/div>\n<div class=\"d10\">rated capacity<\/div>\n<\/div>\n<div class=\"d8\">\n<div class=\"d9\">1.8+1.8<\/div>\n<div class=\"d10\">mm max sheet<\/div>\n<\/div>\n<div class=\"d8\">\n<div class=\"d9\">1&ndash;2000 A<\/div>\n<div class=\"d10\">weld current<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"d11\"><img decoding=\"async\" class=\"d12\" src=\"https:\/\/www.cruxweld.com\/wp-content\/uploads\/2026\/02\/2-in-1-Spot-and-Seam-Welder-%E2%80%93-DuoFlex-20K-20-kVA-with-Digital-Microcomputer-Controller-1.jpg\" alt=\"DuoFlex 20K 2-in-1 spot and seam welder with digital microcomputer controller\" loading=\"lazy\"><\/div>\n<\/div>\n<p class=\"d13\">Most sheet metal shops need two kinds of joints every day: quick <strong>spot welds<\/strong> on lap joints, and neat <strong>continuous seams<\/strong> where the finish matters. Many workshops buy a separate machine for each &mdash; and pay for it in floor space, training time and settings that drift from one operator to the next.<\/p>\n<p class=\"d13\">A <strong>2-in-1 spot and seam welder<\/strong> puts both processes on one power source. Here is how the two processes differ, when each one makes sense, and how the CRUXWELD DuoFlex&nbsp;20K combines them with a programmable controller.<\/p>\n<div class=\"d14\">\n<h2 class=\"d16\">Spot welding vs seam welding<\/h2>\n<div class=\"d15\">The basics<\/div>\n<\/div>\n<div class=\"d17\"><svg class=\"d18\" viewBox=\"0 0 720 230\" width=\"100%\" role=\"img\" aria-label=\"Spot weld points versus continuous seam weld\"><rect x=\"0\" y=\"0\" width=\"720\" height=\"230\" rx=\"16\" fill=\"#f8fafc\"\/><text x=\"24\" y=\"36\" font-size=\"15\" font-weight=\"700\" fill=\"#0f172a\">Spot welding: separate weld points<\/text><rect x=\"24\" y=\"50\" width=\"672\" height=\"46\" rx=\"6\" fill=\"#cbd5e1\"\/><rect x=\"24\" y=\"62\" width=\"672\" height=\"22\" fill=\"#94a3b8\"\/><circle cx=\"70\" cy=\"73\" r=\"13\" fill=\"#f59e0b\" stroke=\"#b45309\" stroke-width=\"2\"\/><circle cx=\"166\" cy=\"73\" r=\"13\" fill=\"#f59e0b\" stroke=\"#b45309\" stroke-width=\"2\"\/><circle cx=\"262\" cy=\"73\" r=\"13\" fill=\"#f59e0b\" stroke=\"#b45309\" stroke-width=\"2\"\/><circle cx=\"358\" cy=\"73\" r=\"13\" fill=\"#f59e0b\" stroke=\"#b45309\" stroke-width=\"2\"\/><circle cx=\"454\" cy=\"73\" r=\"13\" fill=\"#f59e0b\" stroke=\"#b45309\" stroke-width=\"2\"\/><circle cx=\"550\" cy=\"73\" r=\"13\" fill=\"#f59e0b\" stroke=\"#b45309\" stroke-width=\"2\"\/><circle cx=\"646\" cy=\"73\" r=\"13\" fill=\"#f59e0b\" stroke=\"#b45309\" stroke-width=\"2\"\/><text x=\"24\" y=\"136\" font-size=\"15\" font-weight=\"700\" fill=\"#0f172a\">Seam welding: a roller makes a continuous line<\/text><rect x=\"24\" y=\"150\" width=\"672\" height=\"46\" rx=\"6\" fill=\"#cbd5e1\"\/><rect x=\"24\" y=\"162\" width=\"672\" height=\"22\" fill=\"#94a3b8\"\/><rect x=\"46\" y=\"164\" width=\"628\" height=\"18\" rx=\"9\" fill=\"#f59e0b\" stroke=\"#b45309\" stroke-width=\"2\"\/><circle cx=\"674\" cy=\"173\" r=\"20\" fill=\"none\" stroke=\"#0b2545\" stroke-width=\"4\"\/><circle cx=\"674\" cy=\"173\" r=\"4\" fill=\"#0b2545\"\/><text x=\"24\" y=\"218\" font-size=\"12.5\" fill=\"#475569\">Roller electrode travels along the joint<\/text><\/svg><\/div>\n<div class=\"d19\">\n<div class=\"d20\">\n<div class=\"d21\"><img decoding=\"async\" class=\"d22\" src=\"https:\/\/www.cruxweld.com\/wp-content\/uploads\/2026\/02\/Spot-weld-sample-on-sheet-metal-made-with-DuoFlex-20K.jpg\" alt=\"Spot weld made on sheet metal with the DuoFlex 20K handheld spot gun\" loading=\"lazy\"><\/div>\n<div class=\"d23\">\n<div class=\"d24\">Spot welding<\/div>\n<div class=\"d25\"><svg class=\"d26\" width=\"18\" height=\"18\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"#16a34a\" stroke-width=\"3\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M5 12l5 5L19 7\"\/><\/svg> Fast tack joints and repeated weld points<\/div>\n<div class=\"d25\"><svg class=\"d26\" width=\"18\" height=\"18\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"#16a34a\" stroke-width=\"3\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M5 12l5 5L19 7\"\/><\/svg> Lap joints on panels, cabinets, brackets<\/div>\n<div class=\"d25\"><svg class=\"d26\" width=\"18\" height=\"18\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"#16a34a\" stroke-width=\"3\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M5 12l5 5L19 7\"\/><\/svg> Gun goes straight to the joint &mdash; no re-clamping heavy parts<\/div>\n<\/div>\n<\/div>\n<div class=\"d20\">\n<div class=\"d21\"><img decoding=\"async\" class=\"d22\" src=\"https:\/\/www.cruxweld.com\/wp-content\/uploads\/2026\/02\/Roller-seam-welding-wheel-electrode-close-up-for-seam-welding-1.jpg\" alt=\"Roller seam welding a sheet metal joint with the DuoFlex 20K\" loading=\"lazy\"><\/div>\n<div class=\"d23\">\n<div class=\"d24\">Seam welding<\/div>\n<div class=\"d25\"><svg class=\"d26\" width=\"18\" height=\"18\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"#16a34a\" stroke-width=\"3\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M5 12l5 5L19 7\"\/><\/svg> A continuous joint instead of isolated points<\/div>\n<div class=\"d25\"><svg class=\"d26\" width=\"18\" height=\"18\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"#16a34a\" stroke-width=\"3\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M5 12l5 5L19 7\"\/><\/svg> Cleaner visual finish along the edge<\/div>\n<div class=\"d25\"><svg class=\"d26\" width=\"18\" height=\"18\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"#16a34a\" stroke-width=\"3\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M5 12l5 5L19 7\"\/><\/svg> Straight or curved paths with uniform seams batch after batch<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"d14\">\n<h2 class=\"d16\">Why two separate machines cost you more<\/h2>\n<div class=\"d15\">The problem<\/div>\n<\/div>\n<div class=\"d27\">\n<div class=\"d28\">\n<div class=\"d29\">01<\/div>\n<div class=\"d30\">Floor space<\/div>\n<div class=\"d31\">Two machines, two footprints and two sets of cables in a busy shop.<\/div>\n<\/div>\n<div class=\"d28\">\n<div class=\"d29\">02<\/div>\n<div class=\"d30\">Training time<\/div>\n<div class=\"d31\">Operators must learn two different machines and control panels.<\/div>\n<\/div>\n<div class=\"d28\">\n<div class=\"d29\">03<\/div>\n<div class=\"d30\">Setup variation<\/div>\n<div class=\"d31\">Settings drift between machines and operators, so quality changes across shifts.<\/div>\n<\/div>\n<\/div>\n<div class=\"d14\">\n<h2 class=\"d16\">The DuoFlex 20K system: two guns, one power source<\/h2>\n<div class=\"d15\">Meet the DuoFlex 20K<\/div>\n<\/div>\n<p class=\"d13\">The <a class=\"d32\" href=\"https:\/\/www.cruxweld.com\/2-in-1-spot-and-seam-welder-duoflex-20k\/\">CRUXWELD DuoFlex 20K 2-in-1 spot and seam welder<\/a> runs a handheld spot gun and a handheld roller seam option from one 20&nbsp;kVA thyristor-based DC power source. A third gun is available as an upgrade.<\/p>\n<div class=\"d27\">\n<div class=\"d33\">\n<div class=\"d34\"><img decoding=\"async\" class=\"d22\" src=\"https:\/\/www.cruxweld.com\/wp-content\/uploads\/2026\/02\/Handheld-single-sided-spot-welding-gun-for-sheet-metal.jpg\" alt=\"Handheld single-sided spot welding gun for sheet metal\" loading=\"lazy\"><\/div>\n<div class=\"d35\">\n<div class=\"d36\">Standard<\/div>\n<div class=\"d37\">Single-sided spot gun<\/div>\n<div class=\"d31\">Fast weld points on panels, cabinets, enclosures, kitchenware and light frames. Position the gun right on the joint.<\/div>\n<\/div>\n<\/div>\n<div class=\"d33\">\n<div class=\"d34\"><img decoding=\"async\" class=\"d22\" src=\"https:\/\/www.cruxweld.com\/wp-content\/uploads\/2026\/02\/Roller-seam-welding-wheel-electrode-close-up-for-seam-welding-1.jpg\" alt=\"Handheld roller seam welding option on the DuoFlex 20K\" loading=\"lazy\"><\/div>\n<div class=\"d35\">\n<div class=\"d36\">Standard<\/div>\n<div class=\"d37\">Roller seam option<\/div>\n<div class=\"d31\">Continuous seams on straight or curved edges, with consistent seam formation across production runs.<\/div>\n<\/div>\n<\/div>\n<div class=\"d33\">\n<div class=\"d34\"><img decoding=\"async\" class=\"d22\" src=\"https:\/\/www.cruxweld.com\/wp-content\/uploads\/2026\/02\/Optional-double-sided-handheld-spot-welding-gun-upper-lower-electrodes.jpg\" alt=\"Optional double-sided handheld spot welding gun with upper and lower electrodes\" loading=\"lazy\"><\/div>\n<div class=\"d35\">\n<div class=\"d38\">Optional upgrade<\/div>\n<div class=\"d37\">Double-sided spot gun<\/div>\n<div class=\"d31\">Upper and lower copper electrodes clamp the joint from both sides for stronger, more consistent nuggets.<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"d14\">\n<h2 class=\"d16\">Digital microcomputer controller: set it once, repeat it every shift<\/h2>\n<div class=\"d15\">Control<\/div>\n<\/div>\n<div class=\"d39\">\n<div class=\"d40\">\n<figure class=\"d41\"><img decoding=\"async\" class=\"d42\" src=\"https:\/\/www.cruxweld.com\/wp-content\/uploads\/2026\/02\/Digital-microcomputer-controller-for-spot-and-seam-welder-settings.jpg\" alt=\"Digital microcomputer controller for DuoFlex 20K spot and seam welder settings\" loading=\"lazy\"><figcaption class=\"d43\">The digital controller with LCD display and program memory.<\/figcaption><\/figure>\n<\/div>\n<div class=\"d40\">\n<p class=\"d13\">Most inconsistent resistance welds come from variation in timing and operator settings. The DuoFlex 20K controller lets you set the key parameters precisely and <strong>store multiple welding programs<\/strong>, so a repeat job starts with the same settings every time.<\/p>\n<div class=\"d44\">\n<div class=\"d45\"><\/div>\n<div>\n<div class=\"d46\">Weld time<\/div>\n<div class=\"d47\">How long current flows through the joint (1&ndash;999 ms)<\/div>\n<\/div>\n<\/div>\n<div class=\"d44\">\n<div class=\"d45\"><\/div>\n<div>\n<div class=\"d46\">Squeeze time<\/div>\n<div class=\"d47\">Clamping time before welding begins<\/div>\n<\/div>\n<\/div>\n<div class=\"d44\">\n<div class=\"d45\"><\/div>\n<div>\n<div class=\"d46\">Pre \/ post time<\/div>\n<div class=\"d47\">Stabilises the cycle, adjustable 0&ndash;999 ms<\/div>\n<\/div>\n<\/div>\n<div class=\"d44\">\n<div class=\"d45\"><\/div>\n<div>\n<div class=\"d46\">Weld current<\/div>\n<div class=\"d47\">Set to suit sheet thickness and joint design (1&ndash;2000 A)<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"d14\">\n<h2 class=\"d16\">Continuous or pulsed: two welding modes<\/h2>\n<div class=\"d15\">Modes<\/div>\n<\/div>\n<div class=\"d27\">\n<div class=\"d48\">\n<div class=\"d49\">Continuous mode<\/div>\n<div class=\"d50\">The standard choice for regular spot welding cycles and seam welding where stable output is needed.<\/div>\n<\/div>\n<div class=\"d51\">\n<div class=\"d49\">Pulsed mode<\/div>\n<div class=\"d50\">Controls heat input on thinner sheets and sensitive joints, helping reduce marking and heat distortion.<\/div>\n<\/div>\n<\/div>\n<div class=\"d14\">\n<h2 class=\"d16\">Separate machines vs DuoFlex 20K<\/h2>\n<div class=\"d15\">Side-by-side<\/div>\n<\/div>\n<div class=\"d52\">\n<table class=\"d53\">\n<thead>\n<tr>\n<th class=\"d54\"><\/th>\n<th class=\"d55\">Separate spot welder + seam welder<\/th>\n<th class=\"d56\">DuoFlex 20K (2-in-1)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td class=\"d57\">Machines to buy and maintain<\/td>\n<td class=\"d58\"><svg class=\"d26\" width=\"18\" height=\"18\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"#dc2626\" stroke-width=\"3\" stroke-linecap=\"round\"><path d=\"M6 6l12 12M18 6L6 18\"\/><\/svg> Two<\/td>\n<td class=\"d59\"><svg class=\"d26\" width=\"18\" height=\"18\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"#16a34a\" stroke-width=\"3\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M5 12l5 5L19 7\"\/><\/svg> One<\/td>\n<\/tr>\n<tr>\n<td class=\"d57\">Floor space<\/td>\n<td class=\"d58\"><svg class=\"d26\" width=\"18\" height=\"18\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"#dc2626\" stroke-width=\"3\" stroke-linecap=\"round\"><path d=\"M6 6l12 12M18 6L6 18\"\/><\/svg> Two footprints<\/td>\n<td class=\"d59\"><svg class=\"d26\" width=\"18\" height=\"18\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"#16a34a\" stroke-width=\"3\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M5 12l5 5L19 7\"\/><\/svg> One compact unit<\/td>\n<\/tr>\n<tr>\n<td class=\"d57\">Operator training<\/td>\n<td class=\"d58\"><svg class=\"d26\" width=\"18\" height=\"18\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"#dc2626\" stroke-width=\"3\" stroke-linecap=\"round\"><path d=\"M6 6l12 12M18 6L6 18\"\/><\/svg> Two machines to learn<\/td>\n<td class=\"d59\"><svg class=\"d26\" width=\"18\" height=\"18\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"#16a34a\" stroke-width=\"3\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M5 12l5 5L19 7\"\/><\/svg> One controller for both<\/td>\n<\/tr>\n<tr>\n<td class=\"d57\">Repeat jobs<\/td>\n<td class=\"d58\"><svg class=\"d26\" width=\"18\" height=\"18\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"#dc2626\" stroke-width=\"3\" stroke-linecap=\"round\"><path d=\"M6 6l12 12M18 6L6 18\"\/><\/svg> Re-set each machine<\/td>\n<td class=\"d59\"><svg class=\"d26\" width=\"18\" height=\"18\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"#16a34a\" stroke-width=\"3\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M5 12l5 5L19 7\"\/><\/svg> Stored welding programs<\/td>\n<\/tr>\n<tr>\n<td class=\"d57\">Spot + seam on the same part<\/td>\n<td class=\"d58\"><svg class=\"d26\" width=\"18\" height=\"18\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"#dc2626\" stroke-width=\"3\" stroke-linecap=\"round\"><path d=\"M6 6l12 12M18 6L6 18\"\/><\/svg> Move the part between machines<\/td>\n<td class=\"d59\"><svg class=\"d26\" width=\"18\" height=\"18\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"#16a34a\" stroke-width=\"3\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M5 12l5 5L19 7\"\/><\/svg> Switch the gun<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<div class=\"d14\">\n<h2 class=\"d16\">Which gun configuration should you choose?<\/h2>\n<div class=\"d15\">Buying guide<\/div>\n<\/div>\n<div class=\"d27\">\n<div class=\"d60\">\n<div class=\"d61\">Standard 2-in-1<\/div>\n<div class=\"d62\">Single-sided spot gun + roller seam option<\/div>\n<div class=\"d31\">Mixed jobs: quick tack points plus neat continuous seams on panels, enclosures and ducts.<\/div>\n<\/div>\n<div class=\"d63\">\n<div class=\"d61\">Add the double-sided gun<\/div>\n<div class=\"d62\">Upper + lower copper electrodes<\/div>\n<div class=\"d31\">The joint is reachable from both sides and you need stronger, more consistent spot nuggets in production or fixtures.<\/div>\n<\/div>\n<div class=\"d60\">\n<div class=\"d61\">Not sure?<\/div>\n<div class=\"d62\">Share your job details<\/div>\n<div class=\"d31\">Send material, sheet thickness, joint design and production volume, and we will recommend the right combination.<\/div>\n<\/div>\n<\/div>\n<div class=\"d14\">\n<h2 class=\"d16\">Who uses a 2-in-1 spot and seam welder?<\/h2>\n<div class=\"d15\">Applications<\/div>\n<\/div>\n<div class=\"d64\">\n<div class=\"d65\">\n<div class=\"d66\">Sheet metal fabrication<\/div>\n<div class=\"d67\">Panels, sub-assemblies, brackets<\/div>\n<\/div>\n<div class=\"d65\">\n<div class=\"d66\">Electrical panels &amp; enclosures<\/div>\n<div class=\"d67\">Cabinet bodies and doors<\/div>\n<\/div>\n<div class=\"d65\">\n<div class=\"d66\">HVAC &amp; ducting<\/div>\n<div class=\"d67\">Duct components and seams<\/div>\n<\/div>\n<div class=\"d65\">\n<div class=\"d66\">Stainless fabrication<\/div>\n<div class=\"d67\">Stainless assemblies and kitchenware<\/div>\n<\/div>\n<div class=\"d65\">\n<div class=\"d66\">Cabinets &amp; furniture frames<\/div>\n<div class=\"d67\">Wardrobes, frames, channels<\/div>\n<\/div>\n<div class=\"d65\">\n<div class=\"d66\">Maintenance &amp; repair<\/div>\n<div class=\"d67\">Portable handling on site<\/div>\n<\/div>\n<\/div>\n<div class=\"d14\">\n<h2 class=\"d16\">See the DuoFlex 20K in action<\/h2>\n<div class=\"d15\">Videos<\/div>\n<\/div>\n<div class=\"d68\">\n<div class=\"d69\">\n<div class=\"d70\"><iframe class=\"d71\" src=\"https:\/\/www.youtube.com\/embed\/-wDbZN1ePys\" title=\"Roller seam and handheld spot welder combo\" loading=\"lazy\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen><\/iframe><\/div>\n<div class=\"d72\">Roller seam and handheld spot welder combo<\/div>\n<\/div>\n<div class=\"d69\">\n<div class=\"d70\"><iframe class=\"d71\" src=\"https:\/\/www.youtube.com\/embed\/GgUAN9xHgZ4\" title=\"Handheld spot cum seam welder in use\" loading=\"lazy\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen><\/iframe><\/div>\n<div class=\"d72\">Handheld spot cum seam welder in use<\/div>\n<\/div>\n<\/div>\n<div class=\"d14\">\n<h2 class=\"d16\">DuoFlex 20K key specifications<\/h2>\n<div class=\"d15\">Specs at a glance<\/div>\n<\/div>\n<div class=\"d7\">\n<div class=\"d73\">\n<div class=\"d74\">Rated capacity<\/div>\n<div class=\"d75\">20 kVA<\/div>\n<\/div>\n<div class=\"d73\">\n<div class=\"d74\">Input supply<\/div>\n<div class=\"d75\">AC 415 V &plusmn;15%, 50\/60 Hz<\/div>\n<\/div>\n<div class=\"d73\">\n<div class=\"d74\">Max welding capacity<\/div>\n<div class=\"d75\">1.8 + 1.8 mm<\/div>\n<\/div>\n<div class=\"d73\">\n<div class=\"d74\">Welding current range<\/div>\n<div class=\"d75\">1&ndash;2000 A<\/div>\n<\/div>\n<div class=\"d73\">\n<div class=\"d74\">Welding time range<\/div>\n<div class=\"d75\">1&ndash;999 ms<\/div>\n<\/div>\n<div class=\"d73\">\n<div class=\"d74\">Pre \/ post welding time<\/div>\n<div class=\"d75\">0&ndash;999 ms<\/div>\n<\/div>\n<div class=\"d73\">\n<div class=\"d74\">No-load voltage (max)<\/div>\n<div class=\"d75\">11 V<\/div>\n<\/div>\n<div class=\"d73\">\n<div class=\"d74\">Secondary unload voltage<\/div>\n<div class=\"d75\">7.6&ndash;12.8 V<\/div>\n<\/div>\n<div class=\"d73\">\n<div class=\"d74\">Rated primary current<\/div>\n<div class=\"d75\">70 A<\/div>\n<\/div>\n<div class=\"d73\">\n<div class=\"d74\">Controller<\/div>\n<div class=\"d75\">Digital microcomputer, LCD, program memory<\/div>\n<\/div>\n<div class=\"d73\">\n<div class=\"d74\">Welding modes<\/div>\n<div class=\"d75\">Continuous, pulsed<\/div>\n<\/div>\n<div class=\"d73\">\n<div class=\"d74\">Cooling \/ insulation<\/div>\n<div class=\"d75\">Air-cooled transformer, Class H<\/div>\n<\/div>\n<div class=\"d73\">\n<div class=\"d74\">Cable length<\/div>\n<div class=\"d75\">3 m earth \/ 3 m output<\/div>\n<\/div>\n<div class=\"d73\">\n<div class=\"d74\">Operating temperature<\/div>\n<div class=\"d75\">&minus;10 &deg;C to 50 &deg;C<\/div>\n<\/div>\n<div class=\"d73\">\n<div class=\"d74\">Dimensions (L&times;W&times;H)<\/div>\n<div class=\"d75\">520 &times; 800 &times; 680 mm<\/div>\n<\/div>\n<\/div>\n<p class=\"d76\">Full specifications are on the <a class=\"d32\" href=\"https:\/\/www.cruxweld.com\/2-in-1-spot-and-seam-welder-duoflex-20k\/\">DuoFlex 20K product page<\/a>. Looking for other capacities? See the <a class=\"d32\" href=\"https:\/\/www.cruxweld.com\/category\/resistance-welding-equipments\/spot-welder\/\">Cruxweld spot welder range<\/a>.<\/p>\n<div class=\"d14\">\n<h2 class=\"d16\">Packed for safe dispatch worldwide<\/h2>\n<div class=\"d15\">Shipping<\/div>\n<\/div>\n<div class=\"d39\">\n<div class=\"d77\">\n<figure class=\"d78\"><img decoding=\"async\" class=\"d42\" src=\"https:\/\/www.cruxweld.com\/wp-content\/uploads\/2026\/02\/ChatGPT-Image-Feb-12-2026-01_01_35-AM.png\" alt=\"DuoFlex 20K in an export-grade wooden crate\" loading=\"lazy\"><figcaption class=\"d43\">Export-grade wooden crate for sea and air freight.<\/figcaption><\/figure>\n<\/div>\n<div class=\"d79\">\n<p class=\"d13\">For export orders and long-distance shipments, the DuoFlex 20K can be dispatched in a strong, export-grade wooden crate that protects it from impact, vibration and handling shocks in transit.<\/p>\n<div class=\"d80\"><svg class=\"d26\" width=\"18\" height=\"18\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"#16a34a\" stroke-width=\"3\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M5 12l5 5L19 7\"\/><\/svg> Suitable for domestic and international shipments<\/div>\n<div class=\"d80\"><svg class=\"d26\" width=\"18\" height=\"18\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"#16a34a\" stroke-width=\"3\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M5 12l5 5L19 7\"\/><\/svg> Reduces the risk of transit damage<\/div>\n<div class=\"d80\"><svg class=\"d26\" width=\"18\" height=\"18\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"#16a34a\" stroke-width=\"3\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M5 12l5 5L19 7\"\/><\/svg> Recommended for sea and air freight<\/div>\n<\/div>\n<\/div>\n<div class=\"cw-product-section d81\">\n<div class=\"d82\">\n<div class=\"d83\">Get the DuoFlex 20K for your shop<\/div>\n<div class=\"d84\">Spot and seam welding from one 20&nbsp;kVA machine, with stored programs for repeatable results. Ask about the optional double-sided gun and export packing.<\/div>\n<div class=\"d85\"><a class=\"d86\" href=\"https:\/\/www.cruxweld.com\/contact-us\/\">Get a Quote<\/a><a class=\"d87\" href=\"https:\/\/www.cruxweld.com\/2-in-1-spot-and-seam-welder-duoflex-20k\/\">View machine &rarr;<\/a><\/div>\n<div class=\"d88\">GeM Registered OEM Manufacturer &middot; 45+ years of welding expertise &middot; Supported Worldwide<\/div>\n<\/div>\n<div class=\"d89\"><img decoding=\"async\" class=\"d90\" src=\"https:\/\/www.cruxweld.com\/wp-content\/uploads\/2026\/02\/2-in-1-Spot-and-Seam-Welder-%E2%80%93-DuoFlex-20K-20-kVA-with-Digital-Microcomputer-Controller-1.jpg\" alt=\"DuoFlex 20K spot and seam welder\" loading=\"lazy\"><\/div>\n<\/div>\n<div class=\"d14\">\n<h2 class=\"d16\">Frequently asked questions<\/h2>\n<div class=\"d15\">FAQ<\/div>\n<\/div>\n<div>\n<details class=\"d91\">\n<summary class=\"d92\">Is the DuoFlex 20K a spot welder or a seam welder?<\/summary>\n<div class=\"d93\">Both. It combines a handheld spot welding gun and a handheld roller seam welding option in one setup, powered by one 20 kVA source.<\/div>\n<\/details>\n<details class=\"d91\">\n<summary class=\"d92\">What is the maximum sheet thickness?<\/summary>\n<div class=\"d93\">The maximum welding capacity is 1.8 + 1.8 mm for lap joints, as per specification.<\/div>\n<\/details>\n<details class=\"d91\">\n<summary class=\"d92\">What power supply does it need?<\/summary>\n<div class=\"d93\">AC 415 V &plusmn;15%, 50\/60 Hz.<\/div>\n<\/details>\n<details class=\"d91\">\n<summary class=\"d92\">Can I save settings for repeat production?<\/summary>\n<div class=\"d93\">Yes. The digital microcomputer controller stores multiple welding programs, so repeat jobs start with the same settings.<\/div>\n<\/details>\n<details class=\"d91\">\n<summary class=\"d92\">Does it support pulsed welding?<\/summary>\n<div class=\"d93\">Yes. It offers continuous and pulsed modes. Pulsed mode helps control heat on thin sheet.<\/div>\n<\/details>\n<details class=\"d91\">\n<summary class=\"d92\">When do I need the optional double-sided spot gun?<\/summary>\n<div class=\"d93\">When the joint can be reached from both sides and you want tong-type clamping with upper and lower electrodes for stronger, more consistent spot nuggets.<\/div>\n<\/details>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Spot welding vs seam welding, why two separate machines cost more, and how the DuoFlex 20K combines a handheld spot gun and roller seam option on one 20 kVA power source.<\/p>\n","protected":false},"author":4,"featured_media":7316,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[],"class_list":["post-7317","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-welders","entry"],"_links":{"self":[{"href":"https:\/\/www.cruxweld.com\/blog\/wp-json\/wp\/v2\/posts\/7317","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.cruxweld.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.cruxweld.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.cruxweld.com\/blog\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/www.cruxweld.com\/blog\/wp-json\/wp\/v2\/comments?post=7317"}],"version-history":[{"count":1,"href":"https:\/\/www.cruxweld.com\/blog\/wp-json\/wp\/v2\/posts\/7317\/revisions"}],"predecessor-version":[{"id":7322,"href":"https:\/\/www.cruxweld.com\/blog\/wp-json\/wp\/v2\/posts\/7317\/revisions\/7322"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.cruxweld.com\/blog\/wp-json\/wp\/v2\/media\/7316"}],"wp:attachment":[{"href":"https:\/\/www.cruxweld.com\/blog\/wp-json\/wp\/v2\/media?parent=7317"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.cruxweld.com\/blog\/wp-json\/wp\/v2\/categories?post=7317"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.cruxweld.com\/blog\/wp-json\/wp\/v2\/tags?post=7317"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}