Aluminum electrodes inside theAluminium Alloy Welding Wire is not the battery , but the PTC thermistor heating element surface of the aluminum electrode , the aluminum paste by screen printing on the PTC ohmElements on the surface and then through 620 degrees Celsius infiltration into the furnace burning ALUMINUMPole. Because so ohm aluminum paste used in PTC, critical low cost, but poor oxidation resistance , affect life expectancy. There are 3 methods to prevent oxidation of 1 .Outside the metal inert metal plating 2 negative electrode metal and powerConnection 3. Bordered active metal on metal