1. Characteristics of vacuum diffusion welding
(1) The joint strength is high. It is especially suitable for the welding of materials that are prone to cracks by fusion welding. Since the properties of the base metal are not changed, the chemical composition and microstructure of the joint are the same or close to those of the base metal, and the joint strength is high.
(2) There are many types of weldable materials. Diffusion welding can weld a variety of similar metals and alloys, and can also weld many dissimilar materials. If vacuum diffusion welding with a transition alloy layer is used, it is also possible to weld dissimilar or homogeneous materials with great differences in physical and chemical properties and easy to form brittle compounds at high temperatures.
(3) It can be used in the manufacture of components that require large-area bonding, laminated components, hollow components, porous components or components with complex internal passages, closed internal joints, and other components with poor accessibility by welding methods.
(4) Diffusion welding is integral heating, with small component deformation and high dimensional accuracy
2. Main applications of vacuum diffusion welding
Diffusion welding is mainly used for welding, welding and brazing of small, precise and complex weldments that are difficult to meet quality requirements. In recent years, diffusion welding has solved the welding problems of various special materials in technical fields such as atomic energy and aerospace missiles. For example, in the connection of important parts such as wings, hatches, fuselage bulkheads, engine rotor blades, guide vanes, turbine disks, nozzle fairings, fan blades, etc. of advanced aircraft; thrust chambers and tail nozzles of rocket engines; aerospace Aircraft laminate injectors, aerospace aircraft honeycomb panels and other key components. Diffusion welding is also widely used in the machinery manufacturing industry, such as inlaying carbide (or carbide) blades onto heavy tools.
3. Main configurations of vacuum diffusion welding equipment
· Working area size: 600mm (length) × 600mm (width) × 500mm (height)
· Maximum temperature: 1100℃
· Temperature uniformity: ±3℃
· Temperature control accuracy ≤±1℃
· Working vacuum ≤4×10-3Pa
· Master cylinder pressure 500KN, pressure head stroke 400mm
