Świerczyńska Aleksandra, Landowski Michał
Faculty of Mechanical Engineering, Gdańsk University of Technology, 80-233 Gdańsk, Poland.
Materials (Basel). 2020 Sep 3;13(17):3888. doi: 10.3390/ma13173888.
Extreme atmospheric conditions in the marine and offshore industry are harmful to engineering materials, especially to welded joints, and may cause degradation of their properties. This article presents the results of research on the plasticity of bead-on-plate welds made using two types of seamless, copper plated flux-cored wires. Before welding, spools with wire were stored for 1 month in two distinct locations with different geographical and industrial conditions in Poland, and then subjected to visual examination. Bead-on-plate welds were subjected to a static tensile test and on this basis plasticity indexes showing the effect of storage on plasticity were determined. The fractures after tensile tests and the surfaces of the wires were examined on an electron scanning microscope. Additionally, diffusible hydrogen content in deposited metal measurements for each condition were carried out. The highest degradation level was found for wire stored in an agricultural building in north-eastern Poland-there was an almost fourfold decrease in the plasticity index value and the highest diffusible hydrogen content. For the same wire and the same location, the largest difference was also observed in fracture morphology after the tensile test-ductile fracture was obtained for wire at delivery condition while an almost full cleavage fracture was found after relatively short (1 month) storage of wire.
海洋和近海工业中的极端大气条件对工程材料有害，尤其是对焊接接头，可能会导致其性能退化。本文介绍了使用两种无缝镀铜药芯焊丝进行平板堆焊的塑性研究结果。焊接前，焊丝盘在波兰两个具有不同地理和工业条件的不同地点存放1个月，然后进行外观检查。对平板堆焊进行静态拉伸试验，并在此基础上确定显示储存对塑性影响的塑性指标。在电子扫描显微镜下检查拉伸试验后的断口和焊丝表面。此外，还对每种条件下熔敷金属中的扩散氢含量进行了测量。发现存放在波兰东北部一座农业建筑中的焊丝降解程度最高——塑性指标值几乎下降了四倍，且扩散氢含量最高。对于同一焊丝和同一地点，拉伸试验后的断口形态也观察到最大差异——交货状态下的焊丝获得韧性断口，而在相对较短（1个月）的储存后，发现几乎完全是解理断口。
