I use acetylene oxygen to weld a common lathe blade. Why does the blade keep cracking
Ultra-fine grain cemented carbide is to improve the hardness and bending strength and at the same time the development of the alloy material, compared with common hard alloy materials, has a higher strength, hardness, being the same in the intensity of phase has the characteristics of higher hardness at the same time. Ordinary carbide WC particles is about 1 ~ 6 microns, the ultra-fine grain cemented carbide WC particles is only 0.6 mu m, because the WC particles are very small, so the thickness of adhesive around the function of Co components is thinner, at the same time, because of the broken starting small size, high bending strength.
Welded structure of cutting tool should have enough rigidity, enough rigidity is the appearance of the maximum allowable size, and USES high strength steel grade and to ensure that the heat treatment. Carbide blade should be fixed firm, for example, cemented carbide welding blade should have enough degree of fixation, it is to rely on groove and welding quality to ensure that, generally speaking, according to the shape of blade and the cutting tool geometry parameter choice blade groove shape. It is necessary to inspect the blade before the carbide blade is welded to the blade, and the blade must be inspected first. 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 guarantee the welding. In order to ensure the welding strength, choose the suitable solder. During the welding process, good moisture and liquidity should be guaranteed, and the bubbles shall be eliminated, and the welding and alloy welding surfaces shall be fully in contact with the welding phenomenon. Welding flux choice: borax industry, can be used in the drying furnace shall be carried out before use dehydration processing, then crushed, sieve to remove mechanical impurities in again. Use mesh compensation pads. For example: in the welding of titanium high low cobalt fine alloy and welding of long and thin blade, in order to reduce welding stress, and sheet thickness of 0.2 ~ 0.2 mm can be used or mesh aperture 2 ~ 3 mm spacer mesh compensation on welding.
When the welding tool is sharpening, do you have the head of a higher temperature to be dipped directly into the water to cool? Hard alloys crack when the heat is cold. There is not much question about what equipment to use for the tool. After welding, natural cooling and grinding.
