Infrared light is the most dangerous type of radiation.

• A. True
• B. False
• C. It depends on the exposure
• D. Only when welding at high current

Answer: (B)

Radiation risk from welding depends on the type of radiation, how much you’re exposed to, and how long you’re exposed. Infrared light mainly causes heat injuries to skin and eyes, while ultraviolet light from the welding arc causes rapid photochemical damage, including skin burns and arc-eye (photokeratitis). The danger is not fixed to infrared alone; UV and the bright visible light from the arc can be more immediately harmful, especially with inadequate protection. Because exposure level varies with distance, duration, and the use of shielding and proper PPE, infrared can't be considered the most dangerous type in all situations. Use a welding helmet with UV/IR protection and appropriate protective clothing to minimize all radiation risks.