Carbide saw blade and welding method thereof

A method of welding a carbide saw blade, comprising:

• heating a carbide tool bit, a welding wire, a welding flux and a saw blade base, wherein the carbide tool bit and the saw blade base are placed in a predetermined location;
• when a temperature of the carbide tool bit, the welding wire, the welding flux and a tooth seat part of the saw blade base reaches 760° C.-840° C., spreading the melted welding wire to a gap between the carbide tool bit and the tooth seat part of the saw blade base by using a wetting action of the welding flux;
• cooling to obtain a preliminary welding body having the carbide tool bit welded on the saw blade base, when a temperature of the preliminary welding body is lower than 350° C., the preliminary welding body will be processed to a first tempering;
• and
• within 1-3 hours after the first tempering, initiating a second tempering process to temper the preliminary welding body to obtain the carbide saw blade;
• wherein the second tempering is performed in a sealed container,
• wherein the sealed container has a uniform temperature in all spatial location in the sealed container, and
• wherein the first tempering is processed by heating the preliminary welding body at a first tempering temperature between 400° C. to 500° C. for 0.5˜2 second.