Final answer:
It is false that safety goggles are unnecessary when wearing a welding helmet, as goggles provide additional eye protection from particles or metal fragments that may pass around a helmet's coverage.
Step-by-step explanation:
The statement that wearing goggles or safety glasses is unnecessary if a welder is wearing a helmet is false. A welding helmet provides a barrier to protect the face and eyes from the intense light and heat produced by welding, but additional protective eyewear such as goggles offer further defense against debris and other hazards. The safety goggles serve to shield the eyes from small particles or metal fragments that may bypass the helmet's coverage. In welding and other activities involving high-energy electromagnetic radiation like UV rays, proper eye protection is essential to prevent injuries such as welder's flash, also known as photo keratitis, which can lead to cataracts and other serious eye conditions. Therefore, wearing both a helmet and safety goggles provides comprehensive protection to welding professionals.