Compact electric welding pen designed for jewelry engraving machines. Built to protect equipment, heat quickly, and dissipate heat efficiently for reliable, precise spot welding on small metal parts. Key benefits Safety protection: Builtin overload protection chip monitors resistance and automatically shuts down when resistance is too , helping extend the service life of both the pen and the connected engraving machine. Fast, efficient heating: Ceramic induction heating with 5V 8W power delivers rapid warmup so welding tasks are completed quickly and accurately. Rechargeable and convenient: USB interface for easy charging from common USB power sources, eliminating the need for disposable batteries and allowing flexible use in the workshop. Effective heat dissipation: Steel tube construction plus four ventilation holes at the soldering tip promote rapid cooling and improve energy conversion and sustained performance. Key specifications and materials Power: 5V 8W Heating technology: Internal ceramic induction Protection: Builtin overload protection chip with automatic shutdown on resistance Construction: Steel tube design for structural strength and heat conduction Cooling features: Four ventilation holes at the soldering tip for enhanced heat dissipation Charging: USB rechargeable via standard USB interface Why this product solves common problems Prevents damage to delicate engraving equipment by cutting power automatically if conditions indicate overload. Reduces waiting time with fast heating, allowing work to proceed without long warmup delays. Maintains consistent performance under repeated use because of efficient cooling and a robust steel body. Simplifies power and charging needs by using a universal USB connection. Practical applications Jewelry and fabrication: Spot weld broken chains, reattach small metal components, and reinforce links or settings on rings and bracelets. Onsite maintenance for engraving machines: Provide a compact, safe welding source for quick repairs or adjustments without removing the machine from service. Small metalwork and hobby projects: Precision spot welding for metal models, fittings, and fine craft pieces that require controlled, short welds. Usage tips Charge fully via USB before first use and monitor charging with your usual USB power source. Allow brief cooling periods during repetitive welding to benefit from the steel tube cooling and ventilation features. If the unit shuts down due to overload, inspect the contact area for excessive resistance before attempting further welding. This welding pen offers a practical combination of protection, efficient heating, convenient USB charging, and thoughtful cooling design for professional and hobby jewelry work.