Frequently Asked Questions
Questions - Auto-darkening welding filters:
- Are Speedglas™ Auto-Darkening Welding Filters as safe as traditional filters?
- What happens if the battery fails?
- Do you see any of the arc flash?
- Who determines the safety standards for welding filters?
- Are the Speedglas™ Welding Filters fragile?
- Why do Speedglas™ Filters and Shields cost more than traditional filters and shields?
- Are the Speedglas™ Welding Filters compatible with non-Speedglas shields?
Questions - Welding Fumes:
- Which respirator do I need when welding stainless steel?
- Do I really need respiratory protection when welding ordinary steel?
- What sort of respirator is needed when welding surface-treated material?
- What respiratory protection do I need in restricted spaces?
- Does shielding gases and alloyed electrodes affect my working environment?
- When does ozone form?
- What are nitrogen gases?
Answers - Auto-darkening welding filters:
Yes. Speedglas filters always provide UV/IR protection for your eyes, whether they are turned on or off, dark or transparent. They're potentially safer than traditional filters and since the Speedglas shield can always be in the down position, protecting your face and eyes. Plus, your hands are not preoccupied with constant visor adjustment.
To repeat: you're always protected from damaging UV/IR radiation. And no matter what, your eyes are always shaded from flash. When you pick up an OFF Speedglas filter, it's intermediately-shaded. When you turn on the filter, it "lightens" and becomes transparent. When an arc is struck, the filter darkens. (The dark shade level depends upon which Speedglas model is used.)
No. The filter changes too quickly for the eye to see a flash. The transition from no arc to arc occurs without a perceptible flash.
There are authorising bodies for different parts of the world.
No more than traditional filters. All Speedglas filters have inner and outer replaceable protection plates. The filter is recessed back into the helmet for further protection. You can treat the heat- and chemical-resistant nylon helmet very much like any other welding helmet.
3M uses state-of-the-art electronics and super lightweight materials to provide the optimum productive, comfortable, and safe helmet/filter combination available. The filter itself is a seven-layer laminate, hand-assembled under clean room conditions, with numerous quality assurance checks. The result is a flawless filter that always lets you see your work.
No. The high performance and optical clarity of Speedglas filters requires a special design that is not compatible with non-Speedglas helmets. You should never attempt to mix any Speedglas products with non-Speedglas components; doing so may void your product warranty and could result in serious bodily injury.
Answers - Welding fumes:
When welding stainless steel with MIG or MMAW, the welding fumes often contains particles of chromium and nickel, of which chromium is the more toxic. A powered air respirator with particle filter offers you excellent protection in this application. TIG welding does not usually emit much welding fume but creates large quantities of ozone gas: read more under point 6. Plasma cutting and plasma welding give rise to high temperatures, which can emit damaging oxides of nitrogen: read more under point 7.
Although welding fumes from normal steel is not one of the more hazardous types, it is far from good for your health. Among other things, it contains particles of iron oxide, which can cause siderosis (chronic inflammation of the lungs). When welding with MIG/MAG and stick, there are heavy fume emissions, meaning that both a respirator and good ventilation in the workplace are necessary. When welding ordinary steel, a powered air respirator with particle filter is recommended.
When welding surface-treated material, a number of hazardous pollutants can be released. When welding galvanised steel, zinc oxide particles are released. These can cause zinc ague, also known as fume fever. If you weld painted material you should be especially careful, as many paints can give off very hazardous air pollutants. When welding galvanised steel or material painted with lead primer, it is recommended that you use a powered air respirator with particle filter. In combination with an odour filter it will also minimise unpleasant odours. If the material is painted with two component paint or insulated with polyurethane, you should always contact a Safety Engineer. There is a large risk that you will be exposed to isocyanates, which are very hazardous to inhale and difficult to detect. In these cases it is recommended that a compressed air respirator is used.
If you are welding in restricted or semi-ventilated areas – where there is a potential for build up of higher levels of contaminant and/or a reduction in oxygen levels – a compressed air respirator is suggested, regardless of welding method. With a compressed air respirator, providing breathable quality air, you can be confident of getting sufficient oxygen, as well as high levels of protection against gas and particulate contaminants. Powered or compressed air respirators are never to be used in atmospheres immediately dangerous to life or health (IDLH). Always ask a Safety Engineer if you are unsure!
When welding with MIG and TIG, the noble gases argon and helium are used as shielding gases. Neither argon nor helium is considered hazardous, but they can displace oxygen in unventilated areas. In such cases, a compressed air respirator is required. When welding with MAG, carbon dioxide, or a mixture of carbon dioxide and a noble gas, is used as a shielding gas. Since parts of the shielding gas can be converted into carbon monoxide when the gas reaches the air, large quantities of carbon monoxide can form around the welding arc. Carbon monoxide cannot be filtered away. If the ventilation is bad, the oxygen level must be checked and a compressed air respirator used. Alloyed electrodes are common when welding with MAG. The alloys often contain manganese or silicates. This means that large quantities of manganese oxide and silicates are diffused into the surrounding air when you are welding. A powered air respirator with particle filter usually offers sufficient protection against alloy particles.
When welding aluminium not only are particles of aluminium oxide produced but ozone gas is formed by the action of the UV radiation from the arc breaking down molecular oxygen. Ozone is also produced when welding stainless steel with TIG. Eventually ozone will be converted back to oxygen, a process that is speeded up when the ozone comes into contact with solid surfaces. Ozone cannot be filtered from the atmosphere but relies on being converted back to oxygen. At low ozone concentrations the use of a powered air respirator with particulate filter reduces the amount of ozone reaching the welder. This is achieved by the fact that the particle filter (because of its large surface area) and the connecting tube to the welding shield help to catalyse the conversion of ozone back to normal oxygen. At higher concentrations the inclusion of a gas filter would add an additional large surface of carbon granules on which a further reduction of ozone takes place.
Nitrogen dioxide and nitric oxide are examples of nitrogen gases that are formed when you weld with high amperage and high temperatures. Nitrous gases are formed by a reaction in the air between nitrogen and oxygen and are hazardous to inhale in high concentrations, e.g. when welding in confined, poorly ventilated areas. It is recommended that a compressed air respirator is used in such cases.