Wire and arc additive manufacturing (WAAM) is a technology that enables the in-situ manufacturing of large-scale components efficiently for the construction industry. However, uncertainties persist regarding the characteristics of WAAM materials, such as anisotropic mechanical properties and their correlation with metallographic structure and fracture morphology, printing paths, and heat treatment. More experimental data is also required to establish design methods for the application of WAAM stainless steel in construction. To bridge these knowledge gaps, a comprehensive series of tensile tests was therefore conducted on WAAM stainless steel. Four deposition plates were fabricated using WAAM technique with different printing paths, and tensile coupons were extracted in three directions from each plate. Tensile tests were conducted to evaluate the mechanical properties of the material. Optical microscopy (OM) and scanning electron microscopy (SEM) were then employed to examine the metallographic structure of the material and the fracture morphology of the coupons. The results showed that the WAAM material had good yield and ultimate strengths but slightly lower ductility than conventional stainless steel. Anisotropy was observed in some but not all printing paths, and Young's modulus, ultimate strain and fracture strain exhibited the highest values in the 45° specimens. The grain size of the plate was influenced by its printing path. Mechanical properties were associated with the metallographic structure and fracture morphology. Compared to the heat-treated counterpart, the non-heat-treated material exhibited higher yield and ultimate strengths but lower ductility.

线材和电弧增材制造 (WAAM) 是一种能够为建筑行业高效地原位制造大型部件的技术。然而，关于 WAAM 材料的特性仍然存在不确定性，例如各向异性的机械性能及其与金相结构和断裂形态、印刷路径和热处理的相关性。还需要更多的实验数据来建立 WAAM 不锈钢在建筑中应用的设计方法。为了弥合这些知识差距，因此对 WAAM 不锈钢进行了一系列全面的拉伸测试。使用具有不同印刷路径的 WAAM 技术制造了四个沉积板，并从每个板的三个方向提取拉伸试样。进行拉伸试验以评估材料的机械性能。然后采用光学显微镜 (OM) 和扫描电子显微镜 (SEM) 检查材料的金相结构和试样的断裂形态。结果表明，WAAM 材料具有良好的屈服强度和极限强度，但延展性略低于传统不锈钢。在一些但不是所有打印路径中观察到各向异性，杨氏模量、极限应变和断裂应变在 45° 样本中表现出最高值。印版的粒度受其印刷路径的影响。力学性能与金相组织和断口形貌有关。与热处理对应物相比，