The welding of dissimilar armor-grade steels is always challenging due to their carbon equivalent (CE) differences. In this investigation, dissimilar armor-grade steels (rolled homogenous armor (RHA) steels and ultra-high hard armor (UHA) steel) are welded using three electrodes, namely low hydrogen ferritic (LHF), austenitic stainless steel (ASS), and duplex stainless steel (DSS) by shielded metal arc welding (SMAW) process. All the three joints were tested against the 7.62 × 54 mm armor-piercing (AP) projectile. The projectile was wholly stopped at the Weld Metal (WM). Three modes of failures were observed in WM (1) wear debris (WD), (2) wear debris + continuous cracks (WDCC), and (3) fine wear debris + microcracks (FWDMC). The joint fabricated using ASS electrode with the level of failure of WDCC performs better than other joints with the lowest area density of 70 kg/m² due to the high energy absorption capability of the austenite phase and higher strain hardening properties. At the interface, the martensitic band (MB) increases the hardness and has a vital role in determining ballistic resistance. The impact toughness and ductility of the weld metal play a significant role in deciding the ballistic performance more than hardness and strength properties.

由于碳当量 (CE) 的差异，不同装甲级钢的焊接始终具有挑战性。在这项研究中，不同的装甲级钢（轧制均质装甲 (RHA) 钢和超高硬装甲 (UHA) 钢）使用三种电极焊接，即低氢铁素体 (LHF)、奥氏体不锈钢 (ASS) 和双相不锈钢 (DSS) 采用保护金属电弧焊 (SMAW) 工艺。所有三个接头都针对 7.62 × 54 毫米穿甲 (AP) 弹丸进行了测试。弹丸完全停在焊接金属（WM）处。在 WM 中观察到三种失效模式 (1) 磨屑 (WD)、(2) 磨屑 + 连续裂纹 (WDCC) 和 (3) 细磨屑 + 微裂纹 (FWDMC)。²由于奥氏体相的高能量吸收能力和更高的应变硬化性能。在界面处，马氏体带 (MB) 增加了硬度，并在确定弹道阻力方面起着至关重要的作用。焊缝金属的冲击韧性和延展性在决定弹道性能方面比硬度和强度性能更重要。