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Numerical simulation of laser impact spot welding

机译：激光冲击点焊的数值模拟

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摘要

Laser impact spot welding (LISW) is a relatively novel high-speed impact welding technology. It has obvious advantages in welding dissimilar metal foil plates which have a large difference in melting point. However, the bonding mechanism of laser impact spot welding and dynamic mechanical behavior during LISW are difficult to be revealed through experiments or theories. In this research, a systematic numerical simulation study of laser impact spot welding was conducted by using smooth particle hydrodynamics method. The results showed that the jet mainly originated from a thin layer of flyer plate (about 1 mu m thick). It proved that the jet formation is an important condition for the solid-state welding. With the increase in impact velocity of the flyer plate, the bonding interface of Al/Cu and Ti/Cu became flat, tiny smooth wave and swirl-like wave, respectively. The local melting may occur when the impact velocity was large enough. In addition, the flyer plate would periodically penetrate the base plate under the combined action of impact pressure and shear stress, which would lead to the formation of bonding interface waves. Furthermore, the springback of the flyer plate and the spallation of the base plate were also simulated.
机译：激光冲击点焊（LISW）是一种相对新颖的高速冲击焊技术。它在焊接熔点相差很大的异种金属箔板上具有明显的优势。但是，通过实验或理论难以揭示激光冲击点焊的结合机理和LISW期间的动态力学行为。在这项研究中，采用光滑粒子流体动力学方法对激光冲击点焊进行了系统的数值模拟。结果表明，射流主要来自薄薄的翼片板（约1微米厚）。事实证明，射流的形成是固态焊接的重要条件。随着飞板冲击速度的增加，Al / Cu和Ti / Cu的结合界面分别变为平坦的，微小的光滑波和旋涡状波。当冲击速度足够大时，可能会发生局部熔化。另外，在冲击压力和剪切应力的共同作用下，翼板将周期性地穿透基板，这将导致形成粘结界面波。此外，还模拟了传单板的回弹和基板的散裂。

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