电磁焊接过程板件碰撞仿真分析
Simulation research of plates collision in process of electromagnetic welding
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摘要: 利用所设计板件焊接试验台对两1 mm厚一系铝板进行了电磁焊接试验，利用扫描电子显微镜（SEM）对样件波状焊接界面的微观形貌进行观察.为解释其形成原因，对电磁焊接过程中两被焊板件的撞击过程进行3D数值模拟，获得该过程中飞板所受垂向应力变化规律及撞击速度变化曲线，仿真结果与试验所观察现象相符.通过分析焊接接头界面和撞击点应力与撞击速度关系，表明撞击应力并非由撞击速度单独决定，还与撞击位置有关，撞击速度、撞击应力及材料的流动性共同导致了波状焊接界面的形成，对其进行合理控制是改善焊接效果的关键.Abstract: This article describes a welding test of two aluminum plates both about 1mm thick, a test that performed on a designed plate-welding test platform. The observation of the microstructure of the wavelike welding interface which is scanned by SEM is shown in this article as well. In order to make some explanations, a 3D numerical modeling of the collision between two welding plates during the EMW process is performed. Then the regularity of the changable vertical stress and the curve of colliding velocity are obtained and the simulation corresponds with the experimental observation. As a result, not only the colliding velocity but also the colliding position affect the colliding stress, the colliding velocity, stress and the fluidity of materials lead to the wavelike welding interface, so controlling them is the key to improve welding effect.
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Keywords:
- plate /
- electromagnetic welding /
- collision simulation /
- press /
- velocity
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