M42 Tooth and Substrate jointing by laser after separately special spring steel heat treatment. Tooth rigidity and Substrate intension exert their use to the extreme. Using-198 cold treatment, M42 cobalt alloy exert its endurance to the maximum. Apply in incision of mild steel nonmetal, tool steel angle steel, heat pressing steel, stainless steel, inner surpass hot alloy. Tooth rigidity: 69-70 Substrate rigidity: 46-50.