The method of coupling displacement ventilation and mobile local exhaust ventilation can improve the control effect of welding fume generated at non-fixed points in a large-space workshop, but the influence of ventilation parameters on the control effect still needs to be clarified. The effects of air supply velocity and angle during displacement ventilation on the fume capture efficiency of the local exhaust hood were explored when parameters such as distance between local exhaust hood opening and welding point, air velocity at hood opening, and relative position between welding point and air supply outlet during displacement ventilation changed, and the coupled ventilation efficiency was analyzed. The results show that when the air supply angle is 0° (horizontal), a higher air supply velocity during displacement ventilation has a greater impact on the local exhaust ventilation. A higher air supply velocity at the local exhaust hood opening and a closer distance from the hood opening to the welding point mean that its fume capture efficiency is less affected by displacement ventilation. A closer distance from the welding point to the air supply outlet during displacement ventilation indicates a greater impact of displacement ventilation on local exhaust ventilation. Increasing the air supply angle can weaken the impact. The efficiency of coupled ventilation is higher than that of single displacement ventilation, which can be stabilized to 80% within 15 min. Research results can provide a basis for the design and management of the coupled ventilation system.
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