GMAW molten drop molten pool image recognition method and equipment based on long-wave filtering

The invention discloses a GMAW molten drop molten pool image recognition method and equipment based on long-wave filtering, the equipment comprises a camera, a strong light source and a filtering device, the filtering device is composed of an anti-splashing sheet, a neutral filter and a long-wave filter which are sequentially and coaxially fixed in front of a camera lens through frame threads, the strong light source is a xenon lamp or a laser light source, and the long-wave filter is a long-wave filter. The camera is a near-infrared high-speed camera with the shooting frame number of 2000. Based on the radiation characteristics of molten metal in a molten drop molten pool of GMAW welding and the spectral distribution of arc light, a long-wave light filtering and light supplementing combined mode is adopted, a light filtering device filters arc light and adjusts the exposure amount of a camera, meanwhile, a strong light source carries out light supplementing on the process that the camera collects a molten dr