A method for quantitatively evaluating the solid-state welding performance of metallic materials

Abstract

The invention relates to a method for quantitatively evaluating the solid state welding performance of a metal material. The method comprises the following steps: preparing a hot pressing welding sample and a hot pressing reference sample; performing a hot pressing welding experiment and a hot pressing experiment under different experimental conditions; calculating a welding degree of a welding interface; obtaining the mechanical properties of the sample after hot pressing welding and the sample after the hot pressing via tests, and calculating a ratio of the mechanical properties; establishing a quantitative relationship among the experimental conditions, the welding degree of the welding interface and the ratio of the mechanical properties by curve fitting, linear regression and spatialsurface construction, and establishing a weldability map of the metal material in the solid state welding. By adoption of the method provided by the invention, the influence of an interface bonding degree on the mechanical properties of the welding interface can be singly quantified, the quantitative relationship among the fundamental physical quantity in the solid state welding, the bonding degree of the welding interface and the interface performance can be established, the weldability map is established, the solid state welding performance of the metal material is accurately evaluated, andreference and guidance can be provided for solid state welding processes in a variety of practical applications.

Description

technical field [0001] The invention belongs to the technical field of solid-state welding of metal materials, and in particular relates to a quantitative relationship between the basic physical variables of solid-state welding and the bonding degree and interface performance of the welding interface to construct a weldable map of metal materials, and then evaluate the solid-state welding process of metal materials. Solderability method. Background technique [0002] In recent years, solid-state welding technologies such as friction stir welding, linear friction welding, diffusion welding, ultrasonic welding, explosive welding, cold welding, thermocompression bonding, stack rolling, split die extrusion, and ultrasonic stack manufacturing have been successfully applied. Connection of various macroscale (millimeter to meter) engineering structures, wafer-level packaging of MEMS components and bonding of nanoscale components. In solid metal welding technology, the selection of...

AI Technical Summary

Problems solved by technology

However, so far, there are still some key problems that need to be solved in the existing methods

First, people have not yet found a method that can effectively evaluate the solid-state welding performance of metallic materials

Secondly, it is still difficult to quantitatively evaluate the bonding degree of the welding interface, especially when the welding defects of the welding interface are at the submicron level, it is difficult to accurately detect and quantify the degree of unwelded interface by using traditional methods such as ultrasonic flaw detection

Thirdly, at present, people still use the method of directly comparing the mechanical properties of the welds obtained under different welding conditions to distinguish the welding quality of the welds. However, due to factors such as deformation temperature, strain rate, strain and time, the hardness, strength and The mechanical properties such as elongation have a significant impact. Therefore, this method cannot truly reflect the influence of the degree of interfacial bonding on the mechanical properties of the weld.

[0004] In summary, due to the limitations of the above conditions, it is still not possible to accurately establish the quantitative relationship between the basic physical quantities in solid-state welding, the bonding degree of the welding interface, and the mechanical properties of the interface, and no method for quantitatively evaluating the solid-state welding performance of metal materials has been proposed.

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