This work investigates the fatigue performance of 10 mm AISI C1018 low carbon steel plates welded with ER70S-6 using a gas metal arc welding-based spin-arc welding process. Welded joint microstructure is characterized by bainite, acicular ferrite, and allotriomorphic ferrite along with pearlite in the ferritic matrix. The tensile strength of the weld metal was comparable with base metal and meets the mechanical property requirements in accordance with the ASTM A311/A311M-04 (2020) standard. The fatigue strengths of base metal and weld metal are 121 and 126 MPa, respectively, after sustaining 10⁶ cycles. During cyclic loading, fracture surfaces were distinctly noticed as the crack initiation, crack propagation, and final rupture regions. The decrease in alternating stress increased the fatigue cycles to final rupture, and the nature of fatigue fracture was ductile with dimples and voids.

这项工作使用基于气体保护焊的自旋弧焊工艺研究了 10 毫米 AISI C1018 低碳钢板的疲劳性能，该钢板采用 ER70S-6 焊接。焊接接头显微组织的特征是贝氏体、针状铁素体和同素异形铁素体以及铁素体基体中的珠光体。焊缝金属的抗拉强度与母材相当，符合ASTM A311/A311M-04（2020）标准的力学性能要求。母材和焊缝金属的疲劳强度分别为 121 和 126 MPa，经过 10 ⁶循环。在循环加载过程中，断裂表面作为裂纹萌生、裂纹扩展和最终破裂区域被明显地注意到。交变应力的减少增加了疲劳循环到最终断裂，疲劳断裂的性质是具有凹坑和空隙的延展性。