Abstract: The electrode is made of pure Ni and coating with lots of graphite, which filler metal has well wetting quality and liquid inter-dissolution with WC-Co cemented carbide. The analyses of TEM, EDAX show that the bond is made up of solid solution of W, Co and spherical graphite in the matrix of Ni. There are some new brittle phases of Co3W3C, WC1-x formed during welding metallurgy. Most of them are annexed by spherical graphite and only a few of those scattered at the sub-boundary of the matrix. Eventually, the WC-Co cemented carbide has favorable fusion welding of are welding on study condition.

Key words: Arc welding, Bond, Cemented carbide