Welding is a serious task and should not be taken lightly, especially regarding safety standards. Making sure your protective wear holds up to the necessary standards is a key component in addition to employing proper safety procedures.
Important safety equipment for welders includes respirators to protect against fumes and oxides and fire/flame resistant clothing and aprons to protect against heat and burns. Ear muffs protect against noise and stray sparks, and boots and gloves protect against electric shock, heat and burns. But likely the most essential piece of safety equipment for a welder is that which protects the eyes and face.
Welding equipment for eye and face safety includes helmets, shields and goggles that help protect welders from radiation, hot slag and sparks, intense light, irritation and chemical burns. Within the personal protective wear available in head/eye protection for welders, choosing the appropriate lens shade is a key consideration.
Lens Shade for Welders
Wearing the correct lens shade when welding is essential because doing so protects eyes against photokeratitis, a painful condition somewhat like a sunburn to the cornea, caused by electromagnetic energy given off by an arc or flame. This radiant energy, also known as light radiation, can severely and permanently injure a worker’s eyes.
Eye protection for welders must have filtered lenses with a shade number that provides the necessary protection for the job being performed. The shade number tells how much light radiation is allowed to pass through the lens and into the eyes. The higher the number, the darker the filter, and the less light radiation allowed through.
Shades come numbered as high as 14, and the shade necessary depends on the specific task being performed. For example, shielded metal arc welding requires at least a Shade 7 and up to a Shade 14 depending on the electrode size and arc current. For gas welding and oxygen cutting operations, a Shade 3 up to a Shade 8 is required depending on plate thickness. Lower shades are used for tasks like torch brazing and torch soldering.
Examples of Welding goggles designed for gas welding and oxygen cutting applications include:
- Pyramex V2 Goggles with Shade 5 Welding Lenses
- Jackson WS-80 Cutting Goggles with Shade 5 Welding Lenses
- United Brand Welding Goggle with 50mm Cup Shade 5 Welding Lenses
Examples of Welding safety glasses primarily used for torch soldering, brazing and cutting include:
- Bolle Override Safety Glasses with Black Temples and IR Shade 5 Anti-Scratch Lens
- Crews Triwear Safety Glasses with Onyx Frame and Shade 3 Lens
- Elvex Go-Specs Safety Glasses with IR2 Anti-Fog Lens
Some workers prefer to combine eyewear to reach the necessary shade. When doing so, the shade numbers for both pieces of eyewear are added together to obtain the level of shade protection being worn. For example, if safety glasses such as theJackson Hellraiser Safety Glasses with Shade 3 lenses are worn under the Jackson Full Face Shield with Shield 5 Welding Lens, the level of protection is a Shade 8.
An additional consideration when choosing a lens shade involves the need for versatility. When moving from one location or task to another, many workers need the ease of flipping from one lens type to another in order to ensure compliance with safety standards. In these situations, welding safety glasses such as the Pyramex Onix Plus Bifocal Safety Glasses with Clear Anti-Fog Lens or the Shade 5 Welding Flip Lenses or the Uvex Horizon Safety Glasses with Shade 3 Flip Up Lenses might be the best option.
If unsure of the shade level needed for a particular task, use this rule of thumb provided by OSHA on its Eye Protection against Radiant Energy during Welding and Cutting in Shipyard Employment Fact Sheet.
“Start with a shade that is too dark to see the weld zone. Then, go to a lighter shade which gives a sufficient view of the weld zone without going below the minimum.”
This fact sheet also provides a detailed list of the shade recommendations by welding type, so it’s a useful resource to keep on hand when determining the appropriate shade level when welding.