Abstract
The demands for the connection between thin dissimilar and similar materials in the fields of microelectronics and medical devices has promoted the development of laser impact welding. It is a new solid-state metallurgical bonding technology developed in recent years. This paper reviews the research progress of the laser impact welding in many aspects, including welding principle, welding process, weld interface microstructure and performance. The theoretical welding principle is the atomic force between materials. However, the metallurgical combination of two materials in the solid state by atomic force but almost no diffusion has not been confirmed by microstructure observation. The main theories used to explain the wave formation in impact welding were compared to conclude that caved mechanism and the Helmholz instability mechanism were accepted by researchers. The rebound of the flyer is still a critical problem for its application. With proper control of the welding parameters, the weld failure occurs on the base materials, indicating that the weld strength is higher than that of the base materials. Laser impact welding has been successfully applied in joining many dissimilar materials. There are issues still remained unresolved, such as surface damage of the flyer. The problems faced by laser impact welding were summaried, and its future applications were proposed. This review will provide a reference for the studies in laser impact welding, aiming process optimization and industrial application.
Highlights
In the hush service environment, such as the nuclear power plant’s primary water reactor, the performance of single metal materials is difficult to meet the requirement
The huge differences of dissimilar materials, especially in the microstructure, physical and chemical properties, which leads to the production of intermetallic compounds and the large residual stresses during the fusion welding process
This review summarizes the progress of the laser impact welding and the results achieved at this stage from the mechanism of impact welding, the process ofprocess impact and the results achieved at this stage from the mechanism of impact welding, the process of impact welding, the structure, and performance of the impact welded joint
Summary
In the hush service environment, such as the nuclear power plant’s primary water reactor, the performance of single metal materials is difficult to meet the requirement. The impact welding temperature is relatively low, and the thermal cycle time is extremely short. In theory, it can be widely used for welding between any metals. States proposed a non-contact welding and Lippold [14] from The Ohio State University in the United States proposed a non-contact welding method energy source—Laser source—Laser impact impact welding This process process could could realize realize solid solid metallurgical bonding between dissimilar metal foils with a thickness of millimeters/micrometers, metallurgical bonding between dissimilar metal foils with a thickness of millimeters/micrometers, with with precise positioning and flexible as as well as adjustable welding area size. Direction of the laser impact welding process and provides its maturity reference
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