Wire arc additive manufacturing (WAAM) stands out in manufacturing metallic structures due to its great potential for application in industry for automated production of parts with large dimensions and considerable geometric complexity. Due to the wide presence of ribs and wall crossovers in several mechanical components, this work studied the thermal behavior of the low alloy steel wire AWS ER80S-G in a 10-mm-wide and 90-degree intersection, discovering its influence on the microstructure and hardness of the material compared to a flat wall. Thermal analysis showed that the cooling rate at the intersection is lower than that of a flat wall. However, the evaluation of the cooling curves in a CCT diagram of the steel, later confirmed by a metallographic analysis, indicated that the difference between these two regions was insignificant, as the microstructure was quite similar between them (76% ferrite, 20% pearlite, and 4% retained austenite). On the other hand, there was a significant difference among the layers in the same region, ranging from the morphology of acicular grains at the base and top to equiaxed grains in the intermediate region (ASTM grain size 9). This difference in microstructure was significant for the hardness of the material according to the deposited layer; however, there were few differences between the intersection and the flat wall. Therefore, there are no significant differences between these regions concerning the microstructure or cooling rate, with the variances observed in the hardness being more significant only among the layers deposited.

电弧增材制造 (WAAM) 在金属结构制造领域脱颖而出，因为它在工业自动化生产大尺寸和相当复杂的几何形状零件方面具有巨大的应用潜力。由于多个机械部件中广泛存在肋和壁交叉，这项工作研究了低合金钢丝 AWS ER80S-G 在 10 毫米宽和 90 度交叉处的热行为，发现其对微观结构的影响和材料的硬度与平壁相比。热分析表明，相交处的冷却速率低于平坦壁的冷却速率。然而，对钢的 CCT 图中冷却曲线的评估（后来通过金相分析证实）表明，这两个区域之间的差异并不显着，因为它们之间的微观结构非常相似（76% 铁素体、20% 珠光体） ，和 4% 残余奥氏体）。另一方面，同一区域的各层之间存在显着差异，从底部和顶部的针状晶粒形态到中间区域的等轴晶粒（ASTM晶粒尺寸9）。根据沉积层的不同，这种微观结构的差异对于材料的硬度来说是显着的。然而，交叉口和平墙之间几乎没有什么区别。因此，这些区域之间在微观结构或冷却速率方面没有显着差异，观察到的硬度差异仅在沉积层之间更为显着。