Abstract: Based on high-speed camera and image processing technology, the influence of pulse frequency (0-60 kHz) on the behavior of welding arc and molten pool flow of Inconel-52M nickel alloy welding wire was analyzed, as well as their underlying mechanisms. The results indicated that the combination of high-frequency pulse current on conventional low-frequency pulse current could significantly shrink the arc shape, and the arc root size would gradually decrease with the increase of high-frequency pulse frequency. Compared to traditional low-frequency pulse welding, the overall area of the high-frequency pulsed arc decreased, while its core area and proportion increased, leading to improved arc energy concentration and temperature. Under the influence of high-frequency pulse current, both the axial pressure and radial electromagnetic force of the welding arc increased, with maximum increases of 18.0% and 8.1%, respectively. The rise in axial pressure promoted the fluidity of the weld pool, enabling more complete liquid metal flow during the welding process and resulting in a weld morphology characterized by large width and low wetting angle.