Repairing method for through hole of tungsten alloy plate
From the perspective of its material properties, the main market applications of high gravity tungsten alloy are from civil and military applications, focusing on weapons, aerospace, nuclear industry and nuclear medicine, 3C mobile equipment. Based on different needs, tungsten alloy materials and products play different uses in different fields. The market application of the ordnance industry mainly focuses on the structural parts with large size, high dynamic mechanical properties and simple shape. Therefore, the high density, high strength and excellent plastic toughness of tungsten alloy play an important role in the process of high-speed damage.
Currently, based on the specific applications of high-performance tungsten alloy materials for military warheads, high-shielding tungsten alloy parts for radiation protection in nuclear and medical industries, tungsten alloy counterweights for aerospace and high-performance tungsten alloy parts for 3C industry, the overall demand for tungsten alloy materials in the world is about 5000-6000 tons. Military industry and civilian accounted for about 50% respectively, showing a trend of increasing year by year. As for tungsten alloy plate products, according to customer's requirements, we need to process through holes for installation. However, due to the inevitable defects in processing, the size and depth of through-hole products have errors, resulting in defective products. Therefore, in order to reduce product consumption and improve product utilization rate, it is urgent to develop a tungsten alloy through hole filling scheme to reduce loss under the premise of ensuring that the product meets the requirements of use.
Fill the tungsten alloy rivet in the through hole of the tungsten alloy sheet to make it fit tightly. Because the expansion coefficient of the tungsten alloy is very small, it can only be matched by applying a certain pressure, but not by heating expansion. Due to the different composition formula, the powder has a low melting point. After liquid phase sintering, the metal flow will gradually fill the gap around the rivet. Because the rivet and through hole match more closely, through the action of capillary suction and gravity, the gap between the rivet and the hole of tungsten alloy is filled up, and the size error is repaired. The quenched tungsten alloy plate through hole is machined, and the size of the through hole meets the requirements of tungsten alloy plate.
