Go to your local hardware or welding supply house and grab you a pair of cutting glasses. They will look black from the outside but the wearer will see through them a rich green color. There is your #5. They also make cutting goggles but the glasses look much cooler and you wont look like a steampunk weirdo. Wear a clear grinding shield/mask when you weld and you are good to go. Another alternative is to buy an auto datk hood that has a grinding setting on the lens setting and that is normally a #4 or #5, both are good for OAC welding. The choice is yours. Good luck in your class.
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