Welding Helmets Guide: Auto-Darkening Shades, Sensors and Lenses

Most welders now choose an auto-darkening welding helmet. It stays at a light shade so you can see the joint, then darkens automatically when the arc strikes. To compare welding helmets, look at the shade range, the sensitivity and delay controls, the number of arc sensors, the viewing area and the power supply, and check that cover lenses and spare parts are easy to get. This guide explains each spec and compares the welding helmets and parts we have in stock.

Auto-darkening vs fixed-shade welding helmets

A fixed-shade (passive) helmet has a dark filter of one shade. You position the torch, nod or flip the helmet down, then strike the arc. They are simple and need no batteries. The Weldsafe Copper Pitch Black, for example, has a fixed Shade 10 lens and a flip-front design: lift the filter to inspect or chip the weld through a clear lens without taking the helmet off. Its listing describes Shade 10 as a general-purpose shade for ARC and MIG welding at moderate amperage, and says the helmet suits people whose process and material thickness stay the same.

An auto-darkening helmet uses an electronic filter (often called an ADF or cartridge) that switches from a light state to a dark shade in a fraction of a millisecond when its sensors detect the arc. You keep the helmet down the whole time, which makes it easier to hold your position on tacks and short welds. If you weld different processes or thicknesses, a variable-shade auto-darkening helmet is the more flexible choice.

What to look for in an auto-darkening helmet

Shade range: variable vs fixed

Shades are given as DIN numbers: the higher the number, the darker the filter. Thicker material and higher current produce a brighter arc and need a darker shade. Most variable helmets offer DIN 9-13 for welding. Many add a lighter range for cutting: the Weldsafe Titanium lists shades 5-8 for plasma cutting and 9-13 for welding. A helmet with a single dark shade, like the ProEquip DIN 11 filter, suits people who always weld at similar settings. Always set the shade using the chart in your helmet's manual.

Light state

This is how dark the lens is before the arc strikes. A lower number is clearer: the Standard auto-darkening helmet lists a DIN 4 light state and the True Colour lists DIN 3. A clearer light state makes it easier to see the joint when you set up.

Sensitivity and delay

Sensitivity sets how much light it takes to trigger the lens. Turn it up for low-amp TIG, where the arc is dim, and down if other welders' arcs or bright lights nearby keep setting it off. Delay sets how long the lens stays dark after the arc stops. A short delay helps on fast tacking. A longer delay gives the glowing weld pool time to cool on high-amperage work. The Standard helmet lists stepless sensitivity and a delay of 0.15 to 0.80 seconds.

Number of arc sensors

Sensors are the small windows on the front of the cartridge that detect the arc. If your hand, the workpiece or a corner blocks a sensor, a helmet with more sensors is more likely to still see the arc. That helps with out-of-position welding, pipe work and low-amp TIG. Two sensors are common on entry helmets. Four or five are typical on helmets for professional, all-day use.

Viewing area

A bigger window gives you more peripheral vision and less head movement. Our range runs from 96 x 39 mm on the Weldsafe Gold Neon Arc to 100 x 93 mm on the True Colour helmet, which also has side windows.

Switching speed and optical class

Switching speed is how fast the filter goes from light to dark. The listings here quote figures from 0.04 ms (True Colour) to 0.5 ms (ProEquip DIN 11 filter). Optical class is usually given as four numbers, such as 1/1/1/1. Weldsafe's listings explain these as optical class, light diffusion, homogeneity (how even the shade is across the lens) and angle dependence, where 1 is the best rating in each.

Battery and solar power

Most of the auto-darkening helmets we list combine a solar cell with a replaceable lithium button battery. The True Colour helmet, for example, lists a solar panel plus two CR2032 batteries. Carry spare batteries, and store the helmet out of direct sun when you are not using it.

Modes: weld, cut, grind

Grind mode holds the lens in its light state so you can grind with the helmet on. Weldsafe's Gold and Titanium helmets also list a tack mode and a dark-lock mode.

Powered air (PAPR) welding helmets

A powered air-purifying respirator (PAPR) helmet pairs the welding helmet with a belt-mounted blower and filter. The blower sends filtered air across your face. Consider one for long shifts or heavy fume. The GYSmatic 5/13 AIR XXL True Color comes with the GYSmatic 5/13 XXL hood, a motor/filter unit on a waist belt, a lithium-ion battery and charger, a shoulder harness, an air flowmeter and a carry bag. Its listing gives three airflow settings (170, 200 and 230 l/min), a TH2 P R SL filter, and up to 8 hours' battery life. Replacement TH2 particle filters, pre-filters, batteries and chargers are listed separately.

Replacement lenses and cover lenses

Every auto-darkening cartridge sits between a clear outer cover lens and an inner cover lens. The covers take the spatter and scratches. Replace them as soon as they pit or haze, because you will see worse and the cartridge is more exposed. Buy covers made for your exact helmet model. The Weldsafe 7-pack for the Tungsten contains 5 front covers (137 x 118 mm) and 2 rear covers (108 x 104 mm).

If you need reading glasses, a magnifying lens (cheater lens) clips in behind the filter. The Weldsafe Magnifying Lens comes in 1.0 to 3.0 strengths, measures 108 x 50 x 4 mm, and its listing says it is compatible with all Weldsafe helmets and many other brands.

Welding helmets compared

"AS/NZS certified" is how the Weldsafe listings put it. They do not name the standard number.

How to choose by job

• Occasional MIG or stick at the same settings: a fixed Shade 10 flip-front like the Weldsafe Copper, or an entry auto-darkening helmet.
• Home workshop, mixed jobs and plasma cutting: a variable-shade helmet with a cutting range, such as the Weldsafe Gold Neon Arc or the Standard helmet.
• Trade and all-day welding, TIG, out-of-position work: four or five sensors and a large window, such as the Weldsafe Titanium, the True Colour or the GYSmatic XXL.
• Long shifts in fume or confined spaces: a PAPR system like the GYSmatic AIR XXL.
• Upgrading an old fixed-shade helmet: a drop-in solar cartridge such as the ProEquip DIN 11 (108 x 51 mm), which its listing says fits most standard flip-front helmets.

Care and use tips

• Test the lens before each job: some helmets have a self-check or test button.
• Keep the sensors and solar cell clean, and change cover lenses as soon as they are pitted.
• Wear safety glasses under the helmet for chipping and grinding.

FAQ

What shade welding helmet do I need?

It depends on the process and amperage. Variable 9-13 covers most MIG, stick and TIG welding, and 5-8 is used for plasma cutting. Check the shade chart in your helmet's manual and go darker if the arc feels uncomfortably bright.

Are more arc sensors better?

More sensors make it less likely the lens fails to darken when one is blocked. That matters most for out-of-position welding and low-amp TIG.

How often should I change cover lenses?

Whenever spatter or scratches spoil your view. They are consumables, so keep spares for your exact model.

See all helmets, cartridges and spares in Welding Helmets, or browse the wider Welding range.