{"title":"Spot Welders \u0026 Accessories","description":"\u003ch2\u003eSpot Welders \u0026amp; Accessories – Core Equipment for Lithium Battery Pack Welding, Precision, Safe \u0026amp; Efficient One-Stop Welding Solutions\u003c\/h2\u003e\n\u003cp\u003eWelcome to our \u003cstrong\u003eSpot Welders \u0026amp; Accessories\u003c\/strong\u003e collection. In the assembly of lithium battery packs (e.g., 18650, 21700, 26650 packs), a spot welder (also known as a resistance spot welder or capacitive discharge welder) is the \u003cstrong\u003eessential equipment for reliably connecting nickel\/copper strips to battery terminals\u003c\/strong\u003e. Unlike traditional soldering, a spot welder releases an ultra-high current pulse within \u003cstrong\u003emilliseconds\u003c\/strong\u003e, instantly fusing the nickel strip to the battery casing—thereby \u003cstrong\u003eavoiding the thermal damage that prolonged high heat can cause to the cell's internal separator and safety vent\u003c\/strong\u003e. A high-performance, precisely adjustable spot welder is a must-have tool for DIY enthusiasts, battery pack assembly factories, and repair shops to achieve \u003cstrong\u003elow internal resistance, high mechanical strength, and excellent consistency\u003c\/strong\u003e in their battery pack welds.\u003c\/p\u003e\n\u003cp\u003eThis collection features a complete range of products from \u003cstrong\u003eportable lithium battery spot welders\u003c\/strong\u003e and \u003cstrong\u003ecapacitive discharge spot welders\u003c\/strong\u003e to \u003cstrong\u003eindustrial AC transformer spot welders\u003c\/strong\u003e, along with full accessories such as \u003cstrong\u003ewelding pens, electrodes, nickel strips, and foot pedals\u003c\/strong\u003e—covering welding needs for all mainstream lithium battery packs including \u003cstrong\u003e18650, 21700, 26650, 32650, and LiPo\u003c\/strong\u003e. Whether you are a DIY hobbyist building a power bank or e-scooter battery pack, or a factory mass-producing energy storage or traction battery packs, you will find the optimal welding solution here.\u003c\/p\u003e\n\u003ch3\u003eSpot Welders Category Guide\u003c\/h3\u003e\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\" class=\"sw-table\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth style=\"border:1px solid #ccc;\"\u003eCategory\u003c\/th\u003e\n\u003cth style=\"border:1px solid #ccc;\"\u003ePositioning\u003c\/th\u003e\n\u003cth style=\"border:1px solid #ccc;\"\u003eOperating Principle\u003c\/th\u003e\n\u003cth style=\"border:1px solid #ccc;\"\u003eTypical Welding Thickness\u003c\/th\u003e\n\u003cth style=\"border:1px solid #ccc;\"\u003eBest For\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003cbr\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ccc;\"\u003e\u003cstrong\u003ePortable Lithium Spot Welders\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;\"\u003eEntry-level DIY, ultra-portable\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;\"\u003eBuilt-in\/external battery, MOSFET controlled\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #663;\"\u003e0.1–0.15mm (pure Ni)\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;\"\u003ePersonal DIY, power banks, 18650 pack repair\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ccc;\"\u003e\u003cstrong\u003eCapacitive Discharge Spot Welders\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;\"\u003ePrecision welding, high value\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #663;\"\u003eSupercap\/electrolytic bank, pulse discharge\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;\"\u003e0.15–0.3mm (pure Ni\/Ni-plated steel)\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;\"\u003ePower tool packs, batch DIY, small workshops\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ccc;\"\u003e\u003cstrong\u003eIndustrial AC Spot Welders\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;\"\u003eProfessional production, high power\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #663;\"\u003eLine\/MF transformer, SCR\/IGBT controlled\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;\"\u003e0.3–0.5mm+ (pure Ni\/copper)\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;\"\u003eTraction battery packs, energy storage, assembly lines\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #663;\"\u003e\u003cstrong\u003eSpot Welder Accessories\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;\"\u003eConsumables \u0026amp; tools\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ccc;\"\u003eElectrodes, pens, foot switches, nickel strips\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #663;\"\u003e—\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #663;\"\u003eDaily maintenance, consumable replacement, function expansion\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cbr\u003e\n\u003c\/table\u003e\n\u003ch3\u003eCategory Details\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003e1. Portable Lithium Spot Welders\u003c\/strong\u003e\u003cbr\u003e\u003cbr\u003eThe most popular type among DIY enthusiasts today. These units typically feature built-in lithium batteries (e.g., 5000mAh or larger) or are powered by external 12V lead-acid\/LiPo batteries, using \u003cstrong\u003eMOSFET arrays\u003c\/strong\u003e as electronic switches for precise millisecond control. Their key advantages are \u003cstrong\u003ecompact size, cordless operation, and portability\u003c\/strong\u003e, with some models even doubling as power banks. Most support \u003cstrong\u003edual-pulse (pre-heat + main weld)\u003c\/strong\u003e modes, effectively reducing weld splatter and producing rounder, stronger weld nuggets.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRepresentative Models:\u003c\/strong\u003e FNIRSI SWM-10, FNIRSI SWM-20, Seesii Series\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Battery Packs:\u003c\/strong\u003e 18650, 21700, 26650 small-scale packs (e.g., 2–20 cells)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWelding Capability:\u003c\/strong\u003e 0.1–0.15mm pure nickel strip (select models up to 0.2mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBest For:\u003c\/strong\u003e DIY power banks, flashlight battery packs, RC model batteries, e-scooter pack repair\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e2. Capacitive Discharge Spot Welders\u003c\/strong\u003e\u003cbr\u003e\u003cbr\u003eCapacitive discharge welders store energy in \u003cstrong\u003esupercapacitors or large electrolytic capacitor banks\u003c\/strong\u003e and release it in a \u003cstrong\u003ethousands-of-amps pulse\u003c\/strong\u003e via MOSFETs or SCRs during welding. Compared to transformer types, they impose no stress on the power grid, feature high power factor, and deliver excellent weld consistency—ideal for small workshops and advanced DIY users. Welding energy is typically finely adjusted in \u003cstrong\u003eJoules\u003c\/strong\u003e. Advanced models (e.g., kWeld) employ \u003cstrong\u003eJoule metering algorithms\u003c\/strong\u003e that automatically compensate for declining battery voltage, ensuring constant energy per weld.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRepresentative Models:\u003c\/strong\u003e kWeld, BIFRC BSW-108A, K-weld SWM-10, U.S. Solid USS-BSW06\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Battery Packs:\u003c\/strong\u003e 18650, 21700, 26650 small-to-medium packs (e.g., 20–100 cells)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWelding Capability:\u003c\/strong\u003e 0.15–0.3mm pure nickel strip, select models handle 0.3mm copper\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBest For:\u003c\/strong\u003e Power tool battery pack assembly, e-bike\/scooter battery packs, DIY power stations\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e3. Industrial AC Spot Welders\u003c\/strong\u003e\u003cbr\u003e\u003cbr\u003eIndustrial spot welders use \u003cstrong\u003eline-frequency or medium-frequency transformers\u003c\/strong\u003e to step down voltage and generate massive welding currents, with SCRs or IGBTs providing precise pulse control. These welders are \u003cstrong\u003epowerful, handle thick materials, and operate continuously\u003c\/strong\u003e for extended periods—ideal for batch production. Welding heads are typically \u003cstrong\u003efoot-pedal or pneumatic actuated\u003c\/strong\u003e, with replaceable copper electrodes. High-end models offer multi-parameter adjustment (current\/voltage\/time\/pressure) and dual-pulse waveform editing—standard equipment for battery pack factories and repair centers.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRepresentative Models:\u003c\/strong\u003e SUNKKO 737G+, SUNKKO 709A, YaeCCC Series\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Battery Packs:\u003c\/strong\u003e All cylindrical cell formats, supports large-scale continuous production\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWelding Capability:\u003c\/strong\u003e 0.3–0.5mm+ pure nickel strip, 0.1–0.15mm copper strip\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBest For:\u003c\/strong\u003e Mass production of traction battery packs, energy storage system assembly, battery repair stations\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e4. Spot Welder Accessories\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWelding Pens\/Electrodes:\u003c\/strong\u003e The final output point for welding current. Typically made from \u003cstrong\u003ealumina copper or chromium-zirconium copper\u003c\/strong\u003e, offering high-temperature resistance and anti-sticking properties. Electrode diameter is usually 3mm, with tips that can be dressed. Split-type pens allow easy electrode replacement; integrated pens are compact. Premium pens feature built-in \u003cstrong\u003eauto-trigger switches\u003c\/strong\u003e for one-handed operation without a foot pedal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFoot Pedal Switch:\u003c\/strong\u003e Frees up both hands, enabling the standard \"both hands on pens, foot triggers weld\" workflow, dramatically improving efficiency and positioning accuracy.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNickel Strips \/ Nickel-Plated Steel:\u003c\/strong\u003e See our dedicated \u003cstrong\u003eBattery Connecting Tabs \/ Nickel Strips\u003c\/strong\u003e collection.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsulating Washers \/ Welding Jigs:\u003c\/strong\u003e Placed between the battery and nickel strip when welding positive terminals to prevent accidental electrode contact with the battery casing (negative), which would cause a short circuit. Jigs ensure precise positioning when welding multiple cells.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCore Technical Parameters \u0026amp; Selection Guide\u003c\/h3\u003e\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\" class=\"sw-table\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth style=\"border:1px solid #ccc;\"\u003eWelding Material\u003c\/th\u003e\n\u003cth style=\"border:1px solid #ccc;\"\u003eThickness\u003c\/th\u003e\n\u003cth style=\"border:1px solid #ccc;\"\u003eRecommended Pulse Energy\/Current\u003c\/th\u003e\n\u003cth style=\"border:1px solid #ccc;\"\u003eRecommended Welder Type\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003cbr\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ccc;\"\u003e\u003cstrong\u003ePure Nickel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #663;\"\u003e0.1mm\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #663;\"\u003e3–6J \/ 800–1200A\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #663;\"\u003ePortable Lithium Spot Welder\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ccc;\"\u003e\u003cstrong\u003ePure Nickel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #663;\"\u003e0.15mm\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #663;\"\u003e6–10J \/ 1200–1500A\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #663;\"\u003eCapacitive Discharge \/ High-Performance Portable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #663;\"\u003e\u003cstrong\u003ePure Nickel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #663;\"\u003e0.2mm\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #663;\"\u003e10–15J \/ 1500–2000A\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #663;\"\u003eCapacitive Discharge \/ Industrial AC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #663;\"\u003e\u003cstrong\u003ePure Nickel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #663;\"\u003e0.3mm\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #663;\"\u003e15–25J \/ 2000–3000A\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #663;\"\u003eIndustrial AC Spot Welder\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #663;\"\u003e\u003cstrong\u003eCopper\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #663;\"\u003e0.1mm\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #663;\"\u003e8–12J \/ 1500–2000A\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #663;\"\u003eHigh-Performance Capacitive \/ Industrial AC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cbr\u003e\n\u003c\/table\u003e\n\u003cblockquote\u003e\n\u003cp\u003e\u003cstrong\u003eRule of Thumb:\u003c\/strong\u003e Portable lithium spot welders are typically suitable for 0.1–0.15mm pure nickel strips. Capacitive discharge welders can reliably weld 0.15–0.25mm pure nickel strips. Industrial AC spot welders easily handle nickel strips 0.3mm and thicker, as well as copper strips.\u003c\/p\u003e\n\u003c\/blockquote\u003e\n\u003ch3\u003eSpot Welders Buying Guide\u003c\/h3\u003e\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\" class=\"sw-table\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth style=\"border:1px solid #ccc;\"\u003eUsage Scenario\u003c\/th\u003e\n\u003cth style=\"border:1px solid #ccc;\"\u003eRecommended Type\u003c\/th\u003e\n\u003cth style=\"border:1px solid #ccc;\"\u003eKey Selection Considerations\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003cbr\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #663;\"\u003ePersonal DIY, occasional 18650 power bank assembly\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #663;\"\u003ePortable Lithium Spot Welder\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #663;\"\u003eBuilt-in battery ≥5000mAh, dual-pulse support, welding thickness ≥0.15mm pure Ni\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #663;\"\u003eSmall workshop, batch assembly of power tool\/scooter packs\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #663;\"\u003eCapacitive Discharge Spot Welder\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #663;\"\u003eAdjustable energy (Joule mode), high weld consistency, supports 0.2–0.25mm pure Ni\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #663;\"\u003eFactory\/repair station, continuous production of traction battery packs\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #663;\"\u003eIndustrial AC Spot Welder\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #663;\"\u003eTransformer power ≥3kW, multi-parameter adjustment, foot pedal included\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #663;\"\u003eElectrode wear\/damage, need replacement\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #663;\"\u003eSpot Welder Accessories\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #663;\"\u003eMaterial: alumina copper\/chromium-zirconium copper, diameter 3mm, compatible with pen interface\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cbr\u003e\n\u003c\/table\u003e\n\u003ch3\u003e⚠️ Spot Welders Safety Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlways Wear Safety Glasses:\u003c\/strong\u003e Welding can produce flying sparks and metal particles. Always wear safety glasses compliant with ANSI Z87.1 or EN166 standards.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAvoid Shorting the Electrodes:\u003c\/strong\u003e Never let the two electrodes touch each other directly during welding. The instantaneous high current will burn the electrode tips, damage internal MOSFETs, and may cause a fire.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsulate When Welding Positive Terminals:\u003c\/strong\u003e The battery casing surrounding the positive terminal is the negative terminal. When welding nickel strips to the positive terminal, always place a \u003cstrong\u003ehigh-temperature insulating washer (fish paper)\u003c\/strong\u003e between the nickel strip and the battery casing to prevent accidental short circuits.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKeep Electrodes Sharp:\u003c\/strong\u003e Electrodes become dull over time due to oxidation and sticking, increasing contact resistance and causing poor welds. Dress the electrode tips with fine sandpaper or a dressing block every 50–100 welds to keep them flat and sharp.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelect Appropriate Welding Parameters:\u003c\/strong\u003e Excessive welding energy will burn through the nickel strip or damage the cell; insufficient energy results in weak welds and high internal resistance. Always test on scrap material first and inspect the weld nugget for a uniform silver-gray dimple, then perform a pull test.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKeep Away from Flammable\/Explosive Materials:\u003c\/strong\u003e Spot welders release enormous energy. Keep alcohol, acetone, paper, cloth, and other flammables far from the work area.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Off After Use:\u003c\/strong\u003e Store portable welders fully charged and recharge every 3–6 months to prevent battery over-discharge damage. For AC welders, turn off the power switch and unplug after use.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhy Choose Our Spot Welders \u0026amp; Accessories?\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eGenuine Quality Assurance:\u003c\/strong\u003e Products sourced from FNIRSI, kWeld, SUNKKO, BIFRC, Seesii, and other leading domestic and international brands—reliable quality with accurate specifications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComplete Scenario Coverage:\u003c\/strong\u003e From entry-level portable to industrial-grade AC welders, from main units to electrodes\/pens—one-stop solution for all lithium battery pack welding needs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision Welding, High Consistency:\u003c\/strong\u003e Curated selection of welders supporting advanced features like dual-pulse and Joule metering to ensure strong, low-resistance, and consistent weld nuggets.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexible Purchasing:\u003c\/strong\u003e Single-unit retail, bulk wholesale, and OEM customization available to meet both individual DIY and enterprise mass production needs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExpert Technical Support:\u003c\/strong\u003e Guidance on model selection, welding parameter references, and after-sales support to help you efficiently complete battery pack assembly.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e👇👇👇 Browse the product list below to find the perfect \u003cstrong\u003eSpot Welders \u0026amp; Accessories\u003c\/strong\u003e for your needs. For volume quotes or technical inquiries, please contact our customer service team.\u003c\/p\u003e","products":[],"url":"https:\/\/oneandes.com\/collections\/spot-welders-accessories.oembed","provider":"OneAndes","version":"1.0","type":"link"}