{"product_id":"diy-battery-spot-welding-pen-copper-core-3mm-threaded-tip","title":"DIY Battery Spot Welding Pen | Copper Core 3mm Threaded Tip","description":"\n\u003ch2\u003eDIY Battery Spot Welding Pen with 3mm Copper Core\u003c\/h2\u003e\n\u003cp\u003eTake your battery pack builds and DIY electronics projects to the next level with this \u003cstrong\u003ehandheld battery spot welding pen\u003c\/strong\u003e. Engineered for makers, hobbyists, and electronics enthusiasts, this spot welding accessory features a genuine \u003cstrong\u003ered copper (not brass) core\u003c\/strong\u003e for superior conductivity and minimal heat buildup — even under high current loads. With a threaded tip for secure needle fixing and hydraulically tightened joints throughout, this pen is built to deliver consistent, reliable welds every time.\u003c\/p\u003e\n\n\u003cp\u003eMade in Mainland China.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePure Red Copper Construction:\u003c\/strong\u003e Conductivity is 3–5× higher than brass, resulting in far less heat generation during high-current welding passes.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThreaded Tip Fixing:\u003c\/strong\u003e The spot welding needle is securely locked in place via a threaded tightening mechanism — no slippage mid-weld.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHydraulically Tightened Joints:\u003c\/strong\u003e All connections are hydraulically compressed for maximum contact surface area, ensuring safe and stable current flow.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompatible with 100mm Welding Needles:\u003c\/strong\u003e Use a standard 100mm refill, or cut it into two sections for flexible tip length options.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLarge Cable Compatibility:\u003c\/strong\u003e Copper tube inner diameter of 8mm accepts cables up to 4 AWG (~7.5mm) — suitable for high-amperage spot welding machines.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHandheld \u0026amp; Ergonomic:\u003c\/strong\u003e Comfortable grip designed for precise, controlled spot welding on battery strips, nickel strips, and more.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCore Diameter:\u003c\/strong\u003e Approx. 2.3–2.4mm (manually processed; ~8mm length tolerance)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCopper Tube Inner Diameter:\u003c\/strong\u003e 8mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaximum Cable Gauge:\u003c\/strong\u003e 4 AWG (~7.5mm)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWelding Needle Length:\u003c\/strong\u003e Compatible with 100mm needles (can be cut into 2 sections)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Red Copper (high-conductivity)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHigh-Concern Chemicals:\u003c\/strong\u003e None\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePackage Includes:\u003c\/strong\u003e 1× Spot Welding Pen Set\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eInstallation Tips\u003c\/h3\u003e\n\u003cp\u003eWhen connecting a 4 AWG (~7.5mm) cable, smooth out the wire strands first, then slowly twist them and feed into the copper tube (leave 10–15mm of exposed wire for best contact). It is \u003cstrong\u003estrongly recommended to use hydraulic pliers\u003c\/strong\u003e to tighten the cable connection — hydraulic compression far outperforms screw-type fixing when dealing with high currents and ensures a full, firm contact between cable and pen body.\u003c\/p\u003e\n\n\u003ch3\u003eExplore More from Our Workshop Collection\u003c\/h3\u003e\n\u003cp\u003eLooking for more tools and accessories for your electronics projects? Check out our \u003ca href=\"\/products\/1-percent-better-every-day-motivational-canvas-wall-art-print\"\u003e\"1% Better Every Day\" Motivational Canvas Wall Art Print\u003c\/a\u003e to keep your workshop inspired, or browse our \u003ca href=\"\/products\/be-silly-be-honest-be-kind-quote-canvas-wall-art-print\"\u003e\"Be Silly Be Honest Be Kind\" Quote Canvas Wall Art Print\u003c\/a\u003e for a fun shop-wall addition.\u003c\/p\u003e\n\n\u003cp\u003eFor general electrical safety guidelines when working with high-current tools and equipment, refer to \u003ca href=\"https:\/\/www.osha.gov\/electrical\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eOSHA's Electrical Safety Resources\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch3\u003eImportant Notes\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eDue to manual processing, please allow a measurement tolerance of 1–3mm.\u003c\/li\u003e\n  \u003cli\u003eProduct color may vary slightly from images due to monitor display differences.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What type of welding needle is compatible with this DIY spot welding pen?\u003c\/h4\u003e\n\u003cp\u003eA: This spot welding pen is compatible with standard 100mm welding needles. You can use a full 100mm needle or cut it into two sections for versatility. The needle core diameter is approximately 2.3–2.4mm with a manually processed tolerance of about 8mm in length.\u003c\/p\u003e\n\u003ch4\u003eQ: Why is red copper used instead of brass for the spot welding pen core?\u003c\/h4\u003e\n\u003cp\u003eA: Red copper offers 3–5× greater electrical conductivity compared to brass. This means significantly less resistance and heat generation when high current passes through the pen, resulting in cleaner welds and a longer-lasting tool — especially important during intensive battery pack assembly sessions.\u003c\/p\u003e\n\u003ch4\u003eQ: What is the maximum cable size I can connect to this spot welding pen?\u003c\/h4\u003e\n\u003cp\u003eA: The copper tube has an inner diameter of 8mm and can accept cables up to 4 AWG (approximately 7.5mm in diameter). For best results when inserting a 7.5mm cable, smooth out and twist the strands before feeding them into the copper tube, leaving 10–15mm of wire exposed inside.\u003c\/p\u003e\n\u003ch4\u003eQ: Do I need special tools to install the cable into the spot welding pen?\u003c\/h4\u003e\n\u003cp\u003eA: Yes — it is strongly recommended to use \u003cstrong\u003ehydraulic pliers\u003c\/strong\u003e to tighten the cable connection. Hydraulic tightening creates a full-contact, secure joint that screw-type fixing cannot match, especially when large currents are involved. This ensures welding safety and optimal performance.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What type of welding needle is compatible with this DIY spot welding pen?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This spot welding pen is compatible with standard 100mm welding needles. You can use a full 100mm needle or cut it into two sections for versatility. The needle core diameter is approximately 2.3–2.4mm with a manually processed tolerance of about 8mm in length.\"}}, {\"@type\": \"Question\", \"name\": \"Why is red copper used instead of brass for the spot welding pen core?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Red copper offers 3–5× greater electrical conductivity compared to brass. 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