材料期刊网

通过使用外部工具的管子与管板摩擦焊(FWTPET)来焊接钛管和不锈钢管板。铜被用作连接不同材料的夹层，同时用来减小在接头界面形成的金属间化合物的影响。控制FWTPET过程的工艺参数包括切入速率、旋转速度、切入深度、轴向载荷和溢料槽形状。其中，管的溢料槽形状对接头完整性具有很大的影响。在焊接到不锈钢管板的钛管上制作了各种溢料槽形状，如垂直槽、洞、曲折洞和花瓣型。宏观和微观研究表明接头没有缺陷。X射线衍射(XRD)、扫描电镜(SEM)和能谱(EDS)分析表明了铜层和金属间化合物的存在。研究横向和纵向焊接界面的显微硬度。使用一种新的测试程序称为“切入剪切试验”来检测焊接接头的性能。具有花瓣型溢料槽形状的试样具有最高的剪切断裂载荷(31.58 kN)。使用SEM进一步表征剪切面。

Titanium tube and stainless steel tube plate were welded by an innovative friction welding of tube to tube plate using an external tool (FWTPET). Copper was used as an interlayer for joining the dissimilar materials and also to minimize the effect of intermetallics formed at the joint interface. The process parameters that govern FWTPET process are plunge rate, rotational speed, plunge depth, axial load and flash trap profile. Among them, the flash trap profile of the tube has a significant influence on the joint integrity. Various flash trap profiles like vertical slots, holes, zig-zag holes, and petals were made on the titanium tube welded to the stainless steel tube plate. Macroscopic and microscopic studies reveal defect-free joints. The presence of copper interlayer and intermetallics was evident from X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) studies. The microhardness survey was presented across and along the interface. A novel test procedure called“plunge shear test”was developed to evaluate the joint properties of the welded joints. The highest shear fracture load of 31.58 kN was observed on the sample having petals as flash trap profile. The sheared surfaces were further characterized using SEM for fractography.