Welding photography

Too strong ultraviolet rays can harm people's eyes and skin. There are strong ultraviolet rays in the welding arc light, and welders must wear work clothes and protective covers when working. The most obvious function of infrared ray is heat, so it can be used to heat objects, dry paints and grains, and carry out medical treatment. Infrared rays can easily penetrate clouds and smoke, so infrared photographic plates can be used for long-distance photography and high-altitude photography.

So the answer is: ultraviolet, infrared.