Welding tool is in welding connection, the dehydrated borax, copper, manganese, glass powder solder of the blade and the cutter body part, by high temperature melting, make alloy, bonding the knife arbor high speed steel, cubic boron nitride, diamond, ceramics etc. material blade and slots together, in order to satisfy the requirement of machining operations. welding tool is currently used the most widely should be as hard alloy welding tool, because of the hard alloy with high hardness, reached most of the use of material processing requirements, and relative cost of other materials is very low. So it has been widely used .