Pereira Miguel A R, Amaro Ana M, Reis Paulo N B, Loureiro Altino
Department of Mechanical Engineering, CEMMPRE, University of Coimbra, 3030-788 Coimbra, Portugal.
Polymers (Basel). 2021 Jun 23;13(13):2056. doi: 10.3390/polym13132056.
The objective of current work is to analyse the influence of different welding techniques and welding parameters on the morphology and mechanical strength of friction stir welds (FSW) in polymers, based on data collected in the literature. In the current work, only articles that provide data on the joint efficiency, or sufficient information to estimate it are considered. The process using conventional tool is presented and compared with new procedures developed for FSW of polymers, such as those using tools with heated stationary shoulder, preheating of the polymer or double-side passage of the tool. The influence of tool rotational speed (w), welding speed (v), tilt angle and geometry of the pin are discussed. This work focuses on the polymers most studied in the literature, polyethylene (PE) and polypropylene (PP). The use of external heating and tools with stationary shoulder proved to be of great importance in improving the surface finish, reducing defects, and increasing the mechanical strength of the welds. The increase in the ratio increased the joint efficiency, especially when using conventional tools on PE. A trend was obtained for conventional FSW, but it was difficult to establish mathematical relationships, because of the variability of welding conditions.
当前工作的目标是基于文献中收集的数据，分析不同焊接技术和焊接参数对聚合物搅拌摩擦焊（FSW）的焊缝形态和机械强度的影响。在当前工作中，仅考虑提供接头效率数据或有足够信息来估算接头效率的文章。介绍了使用传统工具的工艺，并将其与为聚合物搅拌摩擦焊开发的新方法进行比较，例如使用带有加热固定肩部的工具、聚合物预热或工具双面通过等方法。讨论了工具转速（w）、焊接速度（v）、倾斜角度和搅拌针几何形状的影响。这项工作聚焦于文献中研究最多的聚合物——聚乙烯（PE）和聚丙烯（PP）。事实证明，外部加热和使用固定肩部的工具对于改善表面光洁度、减少缺陷以及提高焊缝的机械强度非常重要。该比例的增加提高了接头效率，尤其是在对PE使用传统工具时。对于传统搅拌摩擦焊获得了一种趋势，但由于焊接条件的变化，难以建立数学关系。
