Ceramic Sintering · Laser Electrode Welding · High-Voltage Ionization: A Full-Process Look at Copper, Platinum & Iridium Spark Plugs

This film analyzes the technical essence of the Spark Plug from three dimensions: Material Types ① Copper Spark Plug: Nickel‑copper alloy center electrode, fast heat transfer for conventional engines. ② Platinum Spark Plug: Platinum disc electrode, corrosion‑resistant, 60,000–80,000 km service life. ③ Iridium Spark Plug: Iridium alloy fine‑wire electrode, melting point >2400°C, fast ignition, 100,000+ km life. Production Process ① High‑pressure dry forming and high‑temperature sintering of alumina ceramic insulator for dielectric strength. ② Multi‑station cold heading of metal shell and thread rolling. ③ Laser welding (platinum/iridium disc) or resistance welding (copper) of the center electrode. ④ Assembly of resistor, sealant, shell crimping; inspection of tightness and resistance. ⑤ Precision gap adjustment and 100% spark testing. Operating Principle The Ignition coil generates 20,000–40,000 volts, delivered to the spark plug‘s center electrode. The high voltage breaks down the air gap between center and ground electrodes, creating an ionized spark that instantly ignites the compressed mixture to drive the piston. With a full range of electrode materials, automated production processes, and proven ionization ignition design, we deliver reliable Engine Parts and Auto Parts to the global market.