Friction welding method with interlayer material added

Abstract

The invention relates to a friction welding method with an interlayer material added. The method is used for realizing the welding of brittle metal or dissimilar metal materials, and comprises the following steps of: pretreating two to-be-welded workpieces; adding an original interlayer to at least one welding end of the two to-be-welded workpieces; installing the to-be-welded workpiece provided with the original interlayer in the two to-be-welded workpieces on a vibrating or rotating clamp, and installing the other to-be-welded workpiece in the two to-be-welded workpieces on an upsetting clamp; wiping the surfaces of the two to-be-welded workpieces with an organic solvent or a cleaning agent to remove impurities on the surfaces of the to-be-welded workpieces; and according to the materials of the two to-be-welded workpieces, adopting the corresponding friction welding parameters for welding. According to the friction welding method, the to-be-welded workpieces can be preheated in the friction welding process, so that the to-be-welded workpieces are more prone to plastic deformation, and therefore reliable connection of fragile and dissimilar metal materials is achieved.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a friction welding method, which is suitable for effective connection of brittle or dissimilar materials (such as TiAl, steel, superalloy, etc.). Background technique [0002] Because TiAl and powdered superalloys still retain excellent comprehensive mechanical properties in high-temperature environments, they have gradually become excellent candidate high-temperature structural materials in the fields of modern aviation, aerospace, weapons and civil industries, but the weldability of such materials is poor. Difference. [0003] At present, the welding method of TiAl material is mainly brazing technology. TiAl brazing technology mainly realizes the connection by adding Ti-based or Ni-based solder with high wettability, but the method of brazing is used to effectively control the microstructure and interface of the brazed joint. The structure is difficult, the connection strengt...

AI Technical Summary

Problems solved by technology

[0002] Because TiAl and powdered superalloys still retain excellent comprehensive mechanical properties in high-temperature environments, they have gradually become excellent candidate high-temperature structural materials in the fields of modern aviation, aerospace, weapons and civil industries, but the weldability of such materials is poor. Difference

[0003] At present, the welding method of TiAl material is mainly brazing technology. TiAl brazing technology mainly realizes the connection by adding Ti-based or Ni-based solder with high wettability, but the method of brazing is used to effectively control the microstructure and interface of the brazed joint. The structure is difficult, the connection strength is low, and the stability is poor

The main problem of directly adopting linear and inertial friction welding technology for welding is that the strength of TiAl material is still high at high temperature, and its plasticity is poor. During the friction process, the friction type on the interface is mainly dry friction, and plastic deformation is not easy to occur. Insufficient heat input, the interface temperature is difficult to quickly reach the temperature required to form the joint, so it is difficult to obtain a reliable welded joint

[0004] A kind of composite welding method of dissimilar materials has been proposed in the related art. In this method, a heater device is added to the inertial friction welding equipment, and an intermediate transition layer with better mutual solubility is added between the two workpieces to be welded. First, the intermediate transition layer and the rotating The workpieces to be welded are non-vacuum, atmospheric pressure diffusion welding, followed by rotary friction welding to obtain welded joints with good welding quality. However, the welding section of this method is limited, and only cylindrical symmetrical structures can be welded, and the first step of diffusion welding requires Heating the whole workpiece to be welded to a higher temperature and holding it for a long time will inevitably have a great impact on the microstructure of the base metal of the workpiece to be welded, thereby affecting the performance of the joint. At the same time, there are two or more joints formed after welding. Welding interface, joint strength will be adversely affected

Images