中间Cu层对TA1/X65复合板熔焊接头性能的影响

Effect of Intermediate Cu-layer on Mechanical Properties of Welded Joints of TA1/X65 Composite Plate

使用Cu-Ag-Mo-Nb药芯焊丝对TA1/X65和TA1/Cu/X65两种爆炸复合板进行熔焊对接,使用SEM、EDS等手段表征接头的微观形貌、元素分布及成分组成,研究了两种试板接头的力学性能。结果表明,两种试板的焊缝各层衔接良好,钛、钢与过渡层的界面处均有明显的灰色过渡带,接头没有气孔、夹杂或裂纹等缺陷。SEM、EDS分析结果表明,在两层试板的三角区产生了Ti Fe相。三层试板中的Cu层防止了Ti、Fe的互扩散,使焊缝两侧至过渡层Ti元素和Fe元素的扩散明显降低,钛焊缝中Fe的含量和钢焊缝中Ti的含量也显著降低。对接头性能的测试结果表明,三层试板的三项力学性能指标均优于两层试板。

Two explosively formed composite plates TA1/X65 and TA1/Cu/X65 were welded with flux cored wire of Cu-Ag-Mo-Nb. Then the effect of the intermediate Cu-layer on the microstructure, element distribution, and mechanical property of the butt welding joints are investigated by means of SEM, EDS and mechanical tester. The results show that the two types plates could be well connected by butt welding, and there exist obvious gray transition zones at the interfaces of titanium, steel and the formed transition layer, but no pores, inclusions, cracks and other defects in the weld joints were observed. According to the analysis of SEM, EDS and XRD, the Ti Fe-phase in the triangle area of the plate TA1/X65 is inevitable. The Cu-layer within of the plate TA1/Cu/X65 can effectively prevent the mutual diffusion of Ti and Fe,thus the diffusion of Ti and Fe onto the transition zone decreased significantly, as a result, the Fe-content in the weld titanium and the Ti-content in the weld steel has also been significantly reduced. Therefore,the weld composite plate TA1/Cu/X65 exhibits better mechanical properties rather than the plate TA1/X65 without Cu-layer in terms of tensile strength, bending modulus and impact strength.