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由于钛合金具有高的化学活性,很难采用传统焊接技术进行连接。在钛合金和不锈钢熔焊过程中,钛容易与空气中的氮和氧反应形成脆性中间化合物,降低焊接接头的力学性能。因此,宜采用扩散连接钛合金。以银为中间层,研究扩散连接Ti-6Al-4V和AISI304不锈钢的工艺参数。通过搭接剪切实验和显微组织分析对接头质量进行评价。通过实验结果得到扩散连接的工艺窗口,为获得无缺陷接头工艺参数提供参考。在750-800°C时可以成功进行扩散连接。在5 MPa和90 min条件下焊接接头可获得最大搭接剪切强度。
Due to the high chemical activity of titanium alloys, it is difficult to connect using conventional welding techniques. In the welding process of titanium alloy and stainless steel, titanium easily react with nitrogen and oxygen in the air to form brittle intermediate compounds, reducing the mechanical properties of welded joints. Therefore, diffusion bonding should be used titanium alloy. With silver as the middle layer, the process parameters of diffusion bonding Ti-6Al-4V and AISI 304 stainless steel were studied. The quality of the joint was evaluated by lap shear test and microstructure analysis. Through the experimental results, the process window of diffusion connection was obtained, which provided a reference for obtaining the process parameters of defect-free joint. A diffusion connection can be successfully made at 750-800 ° C. The maximum lap shear strength is obtained by welding the joint at 5 MPa and 90 min.