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Abstract：
This paper proposes a novel welding process for ultrahigh-strength steel. The effects of welding parameters on the welding process and weld formation were studied to obtain the optimal parameter window. It was found that the metal transfer modes of solid wires were primarily determined by electrical parameters, while flux-cored wires consistently exhibited multiple droplets per pulse. The one droplet per pulse possessed better welding stability and weld formation, whereas the short-circuiting transfer or one droplet multiple pulses easily caused abnormal arc ignition that decreased welding stability, which could easily lead to a \"sawtooth-shaped\" weld formation or weld offset towards one side with more spatters. Thus, the electrical parameters corresponding to one droplet per pulse were identified as the optimal parameter window. Furthermore, the weld zone (WZ) was predominantly composed of AF, and the heat-affected zone (HAZ) primarily consisted of TM and LM. Consequently, the welded joint still exhibited excellent mechanical properties, particularly toughness, despite higher welding heat input. The average tensile strength reached 928 MPa, and the impact absorbed energy at -40 °C for the WZ and HAZ were 54 J and 126 J, respectively. In addition, the application of triple-wire welding for ultrahigh-strength steel (UHSS) demonstrated a significant enhancement in post-weld deposition rate, with increases of 106% and 38% compared to single-wire and twin-wire welding techniques, respectively. This process not only utilized flux-cored wire to enhance the mechanical properties of joints but also achieved high deposition rate welding.
摘要：
本文提出了一种超高强度钢的新型焊接工艺。研究了焊接参数对焊接工艺和焊缝成形的影响，以获得最佳参数窗口。发现实心线的金属传递模式主要由电气参数决定，而药芯焊丝每个脉冲始终表现出多个液滴。每个脉冲的一个熔滴具有更好的焊接稳定性和焊缝成形。而短路转移或一个液滴多脉冲容易引起异常引弧，降低焊接稳定性，这很容易导致“锯齿形”焊缝形成或焊缝向一侧偏移，具有更多的飞溅。因此，对应于每个脉冲一个液滴的电参数被确定为最佳参数窗口。此外，焊接区（WZ）主要由AF组成，热影响区(HAZ)主要由TM和LM组成。因此,焊接接头仍表现出优异的力学性能，特别是韧性，尽管焊接热输入较高。平均抗拉强度达到928MPa,WZ和HAZ在-40°C时的冲击吸收能量分别为54J和126J，分别。此外,超高强度钢（UHSS）的三线焊接的应用表明，焊后沉积速率显着提高，与单丝和双丝焊接技术相比，分别增加了106%和38%，分别。该工艺不仅利用药芯焊丝提高了接头的力学性能，而且实现了高熔敷率焊接。
