Cap Carbide Grade Blade Bit and steel (arbor) thermal expansion coefficient of a large difference, and the thermal conductivity of the alloy is also worse than the blade material, if the welding process is improper, will cause the Weld or stress is too large, in the course of the blade will appear Shedding or cracking phenomenon, a serious occurrence of welding or welding after the blade directly crack, affecting the life of the tool. Therefore, the welding process is critical to the life of the blade. Cap Carbide Grade Blade Bit welding the most commonly used mainly high-frequency welding and oxygen welding two processes. High frequency welding because the temperature is easy to control, heating uniformity, high efficiency, welding quality stability has gradually become the blade of the main welding methods.
1. Cap Carbide Grade Blade Bit inspection
Before welding, please check whether the Cap Carbide Grade Blade Bit is carburized, cracked, curved or uneven uneven. Brazing surface must be flat, if it is spherical or rectangular carbide brazing surface should also meet a certain geometric shape, to ensure that the alloy and the matrix between the good contact in order to ensure the quality of brazing. Seepage serious (darker color, shiny shiny) of the blade, there will be solder or welding on the phenomenon.
Cap Carbide Grade Blade Bit surfaces should be kept clean, no oxide and oil. Generally the surface of the blade sandblasting, no sandblasting equipment, the case can be hand holding carbide, in the rotating green silicon carbide grinding wheel on the brazing surface of the oxide layer and black letters. If you do not remove the hardened alloy brazing surface of the oxide layer, solder is not easy to wet carbide. Experiments show that if the brazing surface if the oxide layer or black grades letters, should be sandblasted, otherwise the solder is not easy to wet carbide, brazing seam will still appear obvious black letters, so that the brazing area decreased Desoldering phenomenon. After blasting carbide can be used gasoline, alcohol cleaning, to remove the oil.
Arbor material generally use carbon content of 0.4 ~ 0.7% of the carbon structural steel, handle height and blade thickness ratio should not be less than 3: 1.
3. Blade slot
The shape of the groove and the blade welding surface as much as possible, the blade and the sipe of the contact surface to be flat, the depth of the blade slot is less than the blade thickness of 0.3 ~ 1mm. The shape of the sip and the welding rod is inconsistent or a large difference between the formation of closed or semi-enclosed groove, easy to cause excessive welding and welding layer is too large, due to thermal expansion after the shrinkage is inconsistent, but also easy to blade welding Caused by stress is too large, the formation of crack. To meet the required use of the weld strength requirements, as far as possible to reduce the area of the brazing surface. The saddle should also be sandblasted and cleaned to remove oil. Cleaning large, you can use alkaline solution to boil 10 ~ 15min.
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