In the conditions of modern industrial production, the organs of vision are subjected to enormous stress. The problem of protection from intense light radiation that occurs during arc welding, plasma cutting and working with molten metal is especially acute. Anti-glare glasses PPE (personal protective equipment) are not just an accessory, but a critical piece of equipment to prevent retinal and corneal burns.
Ignoring the rules of wearing protective optics can lead to occupational diseases such as electroophthalmia, and even irreversible loss of vision. In this article, we will take a closer look at how to choose the right shade level, what standards apply in the industry, and what to look for when purchasing.
There are many types of light filters, each of which is designed for specific technological processes. The wrong choice may create the illusion of security, but will not provide real protection. Therefore, understanding the physical properties of radiation and the characteristics of lenses is necessary for every specialist.
Nature of hazard and types of radiation
The main threat in welding does not come only from visible light, which causes discomfort and squinting. Much more dangerous are the invisible radiation spectra: ultraviolet (UV) and infrared (IR). Ultraviolet radiation can cause corneal burns known as “bunnies” that appear several hours after exposure.
Infrared radiation penetrates deeper, heating the internal structures of the eye, which can lead to clouding of the lens and the development of cataracts in the long term. That's why high-quality light filters must block 100% of the UV and IR spectrum regardless of the degree of dimming.
High-intensity visible light causes glare, reducing image contrast and slowing worker response. This increases the risk of work-related injuries. Modern PPE is designed with all of these factors in mind, striking a balance between protection and visibility.
⚠️ Warning: Even briefly looking at a welding arc without protection can cause a burn to the cornea. Don't rely on reaction time - put on PPE before starting work.
Different types of welding generate radiation of different powers. For example, tungsten arc welding produces harsher radiation than manual arc welding with coated electrodes. Consequently, the requirements for filter density will differ.
Classification of degrees of darkness
The key parameter when choosing glasses is the degree of darkening of the filter. It determines what proportion of the light flux will pass through the lens to the worker’s eye. In international practice and according to GOST standards, a scale from 1 to 16 is adopted, where 1 is light toning, and 16 is complete opacity for visible light.
Different types of work have their own ranges. Using a filter that is too light will cause retina will get burned, and if it is too dark, it will be impossible to see the weld pool, which will worsen the quality of the seam and force the operator to move his face closer to the arc, increasing the risk of injury.
There are also automatic filters (ASFs) that change their transparency in a split second when an arc occurs. When turned off, they are transparent (degree 3-4), and when ignited, the arcs instantly darken to a specified level (9-13).
Below is a table of correspondence between types of work and recommended degrees of shading:
| Type of work | Current (A) | Recommended degree | Filter type |
|---|---|---|---|
| Gas welding (light) | up to 30 | 4 - 5 | Permanent |
| Arc welding (MMA) | 30 - 150 | 9 - 10 | Permanent/ASF |
| Arc welding (MMA) | 150 - 250 | 10 - 11 | Permanent/ASF |
| Argon welding (TIG) | up to 50 | 8 - 9 | Permanent/ASF |
| Plasma cutting | up to 300 | 9 - 12 | ASF |
People over 50 often require filters that are 1 unit lighter as the natural lens of the eye darkens with age and allows less light to pass through.
How does Automatic Light Filter (ASF) work?
ASF is based on a liquid crystal layer sandwiched between polarizing films. When light hits, sensors detect an arc flash and apply voltage to the crystals, changing their orientation and blocking the light in 0.0001 seconds.
Materials and design of safety glasses
The quality of protection depends not only on the filter itself, but also on the housing material and additional coatings. The main material for lenses today is polycarbonate. This material is highly impact resistant and lightweight, making it safety glasses comfortable to wear throughout your shift.
Glass is used less frequently, mainly in stationary shields, since it is heavier and can break if hit. However, modern composite glasses with the addition of rare earth elements provide excellent color rendering, allowing you to better see the color of the weld pool.
Particular attention should be paid to coatings. Anti-fog prevents lenses from fogging during temperature changes, which often happens when leaving a cold room in a workshop or during intensive work. Anti-scratch (anti-scratch) extends the service life of the product.
- 🛡️ Impact resistance: Polycarbonate lenses can withstand the impact of small metal particles at high speed.
- 🌫️ Antifog coating: Critical for work in conditions of high humidity or sudden temperature changes.
- ☀️ UV 400: Guaranteed UV protection up to 400 nm, which is a safety standard.
The design of the frame also plays a role. Glasses should fit snugly to your face, but not press on. The presence of side protection prevents sparks and glare from the periphery. Adjustable temples allow you to adjust the product to your individual head anatomy.
If you wear regular glasses, choose PPE models with extended eyepiece reach or use special attachment filters to avoid damaging your main optics.
Safety Standards and Certifications
When purchasing protective equipment for a business or personal use, it is necessary to require certificates of conformity. In Russia and the EAEU countries, the main document is the Technical Regulations of the Customs Union TR CU 019/2011 “On the safety of personal protective equipment”.
The European standard EN 166 is one of the most stringent in the world and is often used as a quality standard. Markings on glasses and filters must be clear and indelible. The absence of markings or its illegibility is a sign of counterfeit products.
Codes are usually stamped on the body of the glasses and the replacement filter. For example, the letter "F" indicates increased mechanical strength (impact with a low-energy ball), "B" - medium (6 mm ball), "A" - high (6 mm ball at a speed of 190 m/s). For welding work, the minimum requirement is often class "F" or "B".
⚠️ Attention: Check the production date of the filters. Polymer materials degrade over time when exposed to sunlight, even if the glasses have been in storage.
The certificate of conformity must contain information about the applicant, manufacturer, HS code and validity period of the document. You can check the authenticity of the certificate in the RosAccreditation register by number.
Rules for the use and care of personal protective equipment
The durability of safety glasses directly depends on the conditions of their storage and care. Dirt, dust and metal splashes on the surface of the filter reduce its light transmission and distort color perception, forcing the operator to strain his eyesight.
Lenses should only be wiped with special microfiber cloths or a soft cloth previously moistened with water or a special spray for cleaning optics. Using dry, rough cloth, paper or clothing will cause micro-scratches that scatter light and create glare.
Glasses should be stored in a protective case or soft bag, away from direct sunlight and heat sources. High temperatures can deform the plastic housing or disrupt the operation of the liquid crystal layer in automatic filters.
☑️ Daily check of welder's glasses
If the filter has deep scratches, chips, or has changed color (has become cloudy), it must be replaced immediately. The use of damaged PPE is prohibited, as it does not guarantee the declared level of protection.
Timely replacement of damaged filters is cheaper than treatment of occupational eye diseases or sick leave.
Common mistakes when choosing protection
One of the common mistakes is buying universal glasses “for everything.” There is no single solution that is ideal for both gas cutting and low current argon welding. Versatility often means compromising on protection or visibility.
Another mistake is saving on the brand in favor of cheap analogues without labeling. Cheap Chinese filters often do not have the stated degree of darkness or transmit dangerous ultraviolet radiation due to a violation of production technology.
Also, workers often ignore the need to replace the protective glass (plates) that are installed outside the main filter. These plates take the brunt of splashes and sparks. If they are not changed, they quickly become covered with soot, impairing visibility.
- ❌ Ignoring side protection: Glasses without sidewalls do not protect against reflected radiation.
- ❌ Using cracked filters: A crack can become a conductor for ultraviolet radiation.
- ❌ Incorrect adjustment: Pressing the glasses too loosely against the face allows radiation to penetrate from above or below.
It is important to select glasses individually. What is comfortable for one welder may be uncomfortable for another due to the shape of their face or head. Trying on before purchasing is required.
Impact on labor productivity
Quality anti-glare glasses are an investment in productivity. Good color rendering allows the operator to clearly see the boundaries of the weld pool and the fusion zone, which directly affects the quality of the seam.
Comfortable wearing reduces fatigue. If glasses feel pressure, chafe, or fog up, the worker will be more likely to take breaks, adjust them, or get distracted. This reduces overall operational efficiency and increases the risk of defects.
The psychological factor is also important. Confidence in your safety allows you to focus on the technological process, and not on the anticipation of eye pain. Modern models with improved ergonomics help maintain high concentration.
⚠️ Attention: Long-term work in glasses with low light transmittance (too dark) at low currents causes excessive tension in the eye muscles, which leads to headaches and decreased vision.
When choosing PPE, you should consider it as a tool on which the result of work depends. Professional optics are more expensive, but pay for themselves due to the lack of downtime and high quality of work performed.
Why do glasses sometimes show a green or blue tint?
Color rendering depends on the glass composition or filter coating. The green tint (classic welding glass) reduces brightness well, but distorts colors. Filters coated with gold or copper (True Color) provide more natural color reproduction, allowing for greater control over the process.
Results and recommendations for choosing
To sum it up, choosing the right anti-glare glasses is a complex task. It is necessary to take into account the type of work performed, the current strength, frequency of use and the individual characteristics of the operator.
You should not chase the highest degree of darkness “with a margin”. It's counterproductive. It is better to have a replaceable set of filters of different densities or use modern automatic systems that adapt to working conditions.
Always ask for certificates of conformity and check labeling. Take care of your eyesight, because it cannot be restored or replaced, unlike any tool or equipment.
The optimal choice is a balance between maximum protection (UV/IK) and sufficient visibility for a particular process.
Frequently asked questions (FAQ)
How often should safety glasses or filters be changed?
Replacement filters are changed as they become dirty or damaged (scratches, chips). If you work intensively, exterior safety glass may require replacement daily or weekly. The filter itself (the main one) lasts longer, but requires replacement if it loses transparency, changes color, or expires the expiration date specified by the manufacturer (usually 3-5 years).
Can I use regular sunglasses instead of welding glasses?
Absolutely not. Sunglasses do not have the required degree of darkness (usually up to 80-90% versus 99.9% for welding glasses) and, more importantly, do not guarantee protection from harsh ultraviolet and infrared radiation of the welding arc. Using them will cause eye burns.
What does the "CE" marking on glasses mean?
The CE mark (Conformité Européenne) means that the product complies with the essential safety, health and environmental requirements of the European Union. For welding filters this is proof of compliance with EN 166 and EN 169/175.
Are auto-darkening glasses safe for laser welding?
Not all. Conventional ASFs (automatic filters) are designed for arc welding. Laser welding requires special filters that block a specific laser wavelength. Using standard glasses for laser work can be dangerous, as the sensors may not work at the same laser wavelength.
How to clean metal splashes from glasses?
Let the glasses cool down. Carefully remove any large splashes with a wooden spatula or your fingernail, being careful not to scratch the surface. Then wipe with a soft damp cloth. Do not use solvents, acetone or benzine as they may damage the plastic housing and lens coatings.