Krajewski Arkadiusz, Klekot Grzegorz, Cybulak Marcin, Kołodziejczak Paweł
Faculty of Production Engineering, Warsaw University of Technology, 02-524 Warsaw, Poland.
Faculty of Automotive and Construction Machinery Engineering, Warsaw University of Technology, 02-524 Warsaw, Poland.
Materials (Basel). 2020 Sep 20;13(18):4179. doi: 10.3390/ma13184179.
The research described in this article presents a new contactless method of introducing mechanical vibrations into the base material during CO laser welding of low-carbon steel. The experimental procedure boiled down to subjecting a P235GH steel pipe with a 60 mm diameter, 3.2 mm wall thickness and 500 mm length to acoustic signals with a resonant frequency during the welding process. Acoustic vibrations with a frequency of 1385, 110 and 50 Hz were introduced into the pipe along the axis and transversely from the outer surface. The obtained welds were then subjected to structural tests and Vickers hardness measurements. The results of comparative tests show the impact of such introduced vibrations on the granular structure of the welds, as well as on their microhardness in specific areas, such as the face, penetration depth and the heat-affected zone. The effectiveness of the proposed method of introducing vibrations in the scope of grain size and shape as well as changes in the hardness distribution in the obtained welds is demonstrated.
本文所述研究提出了一种在低碳钢的CO激光焊接过程中将机械振动引入母材的新型非接触式方法。实验过程归结为在焊接过程中，使一根直径60毫米、壁厚3.2毫米、长度500毫米的P235GH钢管受到具有共振频率的声学信号作用。频率为1385、110和50赫兹的声学振动沿轴线并从外表面横向引入到钢管中。然后对所获得的焊缝进行结构测试和维氏硬度测量。对比测试结果显示了这种引入的振动对焊缝颗粒结构的影响，以及对焊缝特定区域（如焊缝表面、熔深和热影响区）的显微硬度的影响。证明了所提出的引入振动方法在焊缝晶粒尺寸和形状范围以及所获焊缝硬度分布变化方面的有效性。
