以ZTi55A钛合金大型骨架为研究对象，通过分段铸造与焊接相结合的方法，系统探讨了熔模精密铸造工 艺及后处理工艺。 实验过程中，采用3段式分体铸造和焊接工艺，成功制备出整体铸件，并有效控制了裂纹等缺陷的产 生。 通过合理设计蜡模制备、型壳制备、熔炼浇注及后续酸洗和补焊工艺，可以显著提高铸件的成型质量。 结果表明，成 功实现了整体铸件的完整充型；确定了适用于ZTi55A钛合金的工艺参数，并在酸洗过程中有效去除α脆性粘污层。 此 外，提出的补焊工艺能够修复焊点裂纹，确保了铸件的力学性能与尺寸精度。

Taking a ZTi55A titanium alloy large-scale skeleton as the research object, through the method of segmental casting and welding, investment mould precision casting and posttreatment technology were systematically discussed. Three-stage split casting and welding processes are used to successfully prepare whole casts, and defects such as cracks are effectively controlled. The moulding quality of castings can be significantly improved by the reasonable design of wax mould preparation, shell preparation, melting pouring and subsequent pickling and repair welding processes. The results show that complete filling of the whole casting is successfully achieved, and the process parameters suitable for ZTi55A titanium alloy are determined. The α-brittle fouling layer is effectively removed during pickling. In addition, the proposed repair welding process can repair the solder joint crack and ensure the mechanical properties and dimensional accuracy of the casting.