Yes, during welding our eyes need protection as when we weld anything , the metal and both which is needed on welding are so hot and they emits a lot of energy and Light ... So if we protect our eyes we could c that where and how much weld is required of and it also protects our eye from small metal pieces which could harm our w eye ball rather it can Blind us by piercing through our eyes.

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In arc welding, eyes are needed to be protected against tiny metal particles or chips and harmful radiations such as UV and IR radiations.