In this study, comparison has been made between stationary arc gas metal arc welded (STA-GMW) joints and rotating arc gas metal arc welded (RTA-GMW) joints made of 18 mm thick armour steels. Both the joints were tested to evaluate tensile properties, impact toughness and microhardness variations. From the results, it is identified that RTA-GMW joint consists of minimum HAZ width (45%) than STA-GMW joint due to lower heat density attributed during the welding. The RTA-GMW joint exceeds the STA-GMW joint in terms of transverse tensile strength (784 MPa) and impact toughness (82 J). This is attributed to the presence of a greater volume percentage of fine delta ferrite (29.17%) in the RTA-GMW joint weld metal. Furthermore, the delta ferrite morphology in the STA-GMW joint is globular, whereas it is vermicular in the RTA-GMW joint. This may be one of the reasons behind the RTA-GMW joint’s increased performance.

在这项研究中，对由 18 毫米厚的装甲钢制成的固定式电弧气体保护金属电弧焊 (STA-GMW) 接头和旋转电弧气体保护金属电弧焊 (RTA-GMW) 接头进行了比较。对两个接头都进行了测试，以评估拉伸性能、冲击韧性和显微硬度变化。从结果中可以看出，RTA-GMW 接头比 STA-GMW 接头的热影响区最小宽度 (45%) 是因为焊接过程中的热密度较低。RTA-GMW 接头在横向拉伸强度 (784 MPa) 和冲击韧性 (82 J) 方面超过了 STA-GMW 接头。这归因于 RTA-GMW 接头焊接金属中存在较大体积百分比的细三角铁素体 (29.17%)。此外，STA-GMW 接头中的 delta 铁素体形态是球状的，而 RTA-GMW 接头中是蠕虫状的。