Abstract: By replacing the granular casted carbonization tungsten with spherical sintered carbonization tungsten, filling quantitative of self-fluxing nature holly, the thin metal wall welding rod was made. Meanwhile its component, the character and the wear-resisting was analyzed. Finally, the disc bit is tested that was enhanced by the welding rod. The conclusion is that the welding rod mobility and wear-resisting are better than those before, and the disc bit's well drilling effect is outstanding after the reinforcement.

Key words: disc bit, WC hard alloy, tube filler metal, teeth enhancemen