Abstract: The cold metal transfer with pulse(CMT-P) technology has broadened the range of heat input in arc manufacturing and enabled more precise control over heat transfer during the remanufacturing and repairing processes -of duplex stainless steel components. However, the complex physical processes are still unclear such as heat transfer, arc behavior, and and molten pool dynamics during the arc manufacturing of duplex stainless steel CMT-P. To address the problem, based on electromagnetism, hydrodynamics, and thermodynamics theories, a transient three-dimensional CMT-P multi-physics field model, including arc and molten pool, has been developed, to study the arc plasma heat transfer behavior of duplex stainless steel. The results indicate that during the pulse phase, the temperature of arc plasma is only positively correlated with the input current. In the CMT phase, the temperature in the arc column region is not only positively correlated with the input current, but also affected by the conductive path. During the wire feeding stage, the temperature in the arc column region shows a significant trend of initially increases and then decreases with the shrinking of the conductive path. Meanwhile, as the conductive path decreases, the current density increases and the high-speed zone disappears. The current density increases and the high-speed zone disappears. The phenomenon effectively enhances the stability of the wire feeding stage. The temperature field of the molten pool exhibits a characteristic double ellipsoid shape, with a noticeable time lag between changes in the molten pool shape and the input current.

Key words: duplex stainless steel, remanufacturing and repair, plasma, arc heat transfer, numerical simulation