Erie Tool & Supply - Special Materials and Resistance Welding Supplies MATERIALS MiTech No Chat Material Copper Tungsten Southern Copper Class II & III Copper Bar Stock CMW Inc.... Elkonite RESISTANCE WELDING Tipaloy Spot Welding Tips & Holders Tuffaloy Welding Tips & Holders Erie Tool is a leading source for sintered copper materials, elkonite of all grades... is used for various specialty welding applications and High Density Tungsten materials are used for grinding quills, boring bars, weights, counterbalances and radiation shielding...