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Table  3-1.Recommended  Filter  Lenses  for  Various  Welding  Operations

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Table  3-1.—Recommended  Filter  Lenses  for  Various  Welding  Operations window, for a flip-up filter lens 2 inches by 4 1/4 inches second is to eliminate the harmful infrared and ultravio- in size. The helmet shown in view D has a 4 1/2-inch by 5  1/4-inch  window.  The  larger  window  affords  the welder a wider view and is especially useful when the welder  is  working  in  a  confined  place  where  head  and body  movement  is  restricted.  When  welding  in  locations where other welders are working, the welder should wear  flash  goggles  beneath  his  helmet  to  provide  pro- tection from the flashes caused by the other welders’ arcs. The flash goggles will also serve as eye protection when chipping the slag from a previous weld deposit. Helmets  and  welding  goggles  used  for  eye  protec- tion are made from a nonflammable insulating material. They are fitted with a removable protective colored filter and a clear cover lens. NOTE: The purpose of the clear cover lens is to protect the filter lens against pitting caused by sparks and hot metal spatter. The clear lens must be placed on the outside of the filter lens. The clear lens should be replaced when it impairs vision. Filter lenses are furnished in a variety of shades, which are designated by number. The lower the number, the lighter the shade; the higher the number, the darker the shade. Table 3-1 shows you the recommended filter lens shade for various welding operations. The filter lens shade number selected depends on the type of work and somewhat  on  the  preference  of  the  user.  Remember,  a filter lens serves two purposes. The first is to diminish the intensity of the visible light to a point where there is no glare and the welding area can be clearly seen. The let  radiations  coming  from  the  arc  or  flame;  conse- quently, the filter lens shade number you select must not vary  more  than  two  shades  from  the  numbers  recom- mended  in  table  3-1. Rule of thumb: When selecting the proper shade of filter lens for electric-arc welding helmets, place the lens in the helmet and look through the lens as if you were welding. Look at an exposed bare light bulb and see if you can distinguish its outline. If you can, then use the next darker shade lens. Repeat the test again. When you no longer see the outline of the bulb, then the lens is of the proper shade. Remember that this test should be performed in the same lighting conditions as the welding operation is to be performed. Welding in a shop may require a shade lighter lens than if the same job were being performed in bright daylight. For field operations, this test may be performed by looking at a bright reflec- tive  object. WARNING Never  look  at  the  welding  arc  without proper eye protection. Looking at the arc with the naked eye could lead to permanent eye damage. If you receive flash burns, they should be  treated  by  medical  personnel. A variety of special welder’s clothing is used to protect  parts  of  the  body.  The  clothing  selected  varies 3-33



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