The problem of car knife brazing
Carbide blades should be fixed firmly Cemented carbide welding blade should have enough degree of fixation, it is to rely on groove and welding quality to guarantee, therefore, according to the blade shape and the cutting tool geometry parameter choice blade groove shape. Before the blade welding to the tool holder need to blade, tool rod to make the necessary inspection, first check the blade bearing surface can't be serious bending. Hard alloy welding surface must not have serious carburizing layer, at the same time should also will carbide blade surface and cutter bar set of dirt to clean, to ensure the welding.
The structure of welded cutting tool should be sufficiently rigid Sufficient rigidity is guaranteed by the size of the maximum allowable dimensions and the use of high strength steel and heat treatment.
Find a 45 # new handle, and the tool head, copper wire, magnesium powder, and gas welder are ready. Place the head of the knife on the handle of the handle, point the gas welding gun and then use the copper wire to apply a bit of magnesium powder to the handle of the knife and the handle of the handle, and spray evenly. And then natural cooling for about half an hour.
Requirement for welding welding flux It is suggested that the industrial borax should be treated by dehydration in the drying oven before using, and then it will be crushed, and the machine will be removed and removed. Welding titanium low cobalt fine alloy and high alloy welding the long, thin blade, in order to reduce welding stress, and suggest the thickness of 0.2-0.2 mm wafer or mesh aperture 2 -- 3 mm spacer mesh compensation on welding. Due to large carbide insert brittleness, the crack formation sensitivity is strong, so the cutting tool in the process of grinding should avoid overheating or quenching, as well as choosing appropriate particle size of grinding wheel and reasonable grinding process, to avoid grinding cracks, affect the service life of the cutting tool. When the tool is installed, the length of the tool holder should be as small as possible, otherwise it can cause the tool to vibrate and damage the alloy plate Cutting tool used to achieve normal grinding blunt, heavy grinding, must be conducted after resharpening of knives, must use oil stone to grinding blade and blade edge, which will improve the service life of cutter and the safety and reliability
Requirement of welding welding material In order to guarantee the welding strength, should choose the right solder. In the process of welding, shall ensure that the good wettability and liquidity, and to eliminate air bubbles, make a good contact with welding and alloy welding surface, shape welding phenomenon.
