Welding Shade Chart: The Complete Guide to Lens Shades

A first-year apprentice grabs a spare shade 10 helmet for a 450-amp structural stick job because it is the lens that was lying in the tray. He finishes the bead feeling proud, then spends that night with gritty, light-sensitive eyes that will not open without pain. The fix for that miserable night is not a better helmet or a tougher pair of eyes — it is knowing how to read a welding shade chart before you strike an arc.

What a Welding Shade Chart Is and Why It Exists

A welding shade chart is a lookup table. You take three things you already know before you strike an arc — the welding or cutting process you are running, the electrode or tip size, and the arc current set on the machine — and the chart hands back one number: the darkest protective filter lens shade you are allowed to wear for that combination. That single number is the whole point of the chart. It removes the guesswork, the “this one was lying in the tray” decision, and the guess-your-way-through-a-450-amp-bead habit that ends with a painful night of gritty, light-sensitive eyes.

It is worth being precise about what a shade number actually is, because a surprising number of welders treat it like a fashion choice. A shade number describes how much light a filter lens blocks. The higher the shade number, the darker the filter, and the less radiant energy reaches the eye. OSHA states this relationship explicitly in its guidance on eye protection during welding. Filters on the market run from very light values around 1.5 to 2, used for soldering and light brazing, up to shade 14 for heavy arc welding and gouging work.

Who Publishes the Chart

Three sources matter, and they are not interchangeable:

• OSHA — the legally enforceable floor for US employers. OSHA’s shade tables live in 29 CFR 1910.252 for general industry and in 29 CFR 1926.102 Table E-1 for construction. There is also a separate OSHA eye protection fact sheet that applies to shipyard employment, which matters because shipyard rules treat stacked filter shades differently than general industry does.
• ANSI Z49.1, Safety in Welding and Cutting and Allied Processes — the consensus standard published by the American Welding Society and adopted by most employers with a real safety program. Its Table 1 is the shade chart most welders actually carry in their heads, and it is drawn from AWS F2.2, the Lens Shade Selector.
• ANSI Z87.1 — the standard that governs whether a lens is even permitted on your face. Every welding filter lens must be marked with its shade number and must meet Z87.1 transmittance requirements for ultraviolet, visible, and infrared light. An unmarked lens is, for compliance purposes, not a lens at all.

The AWS version of Z49.1 is available as a free PDF download from the American Welding Society, which is worth doing if you would rather read the real table than a summary of it. OSHA’s own eye protection fact sheet restates the same core logic in one page.

Why the Chart Has to Exist

Because a welding arc is not just bright — it is a broadband radiation source. That small pool of molten metal throws out ultraviolet radiation, infrared radiation, and intensely bright visible light, and it does it continuously for as long as the arc is lit. Your cornea absorbs UV and burns the way skin burns, only faster. Your retina absorbs the visible and near-infrared end, where the damage does not hurt at the moment it happens. We look at what each of those bands actually does to the eye in the next section, but the short version is enough to explain the chart: unprotected eyes can be injured within seconds of arc exposure, and the injury does not always announce itself until hours later.

That is the reason a shade chart exists rather than common sense. Common sense tells you an arc is bright. It does not tell you that a 200-amp MIG bead and a 450-amp stick bead need different filters, or that a gouging arc is harsher than the welding arc it came from. The chart does.

What This Guide Covers

From here, this article works through the whole subject in order. First the science: what UV, IR, and visible glare actually do to eyes, including the bystanders standing next to you. Then the mechanics of reading the scale itself, including ANSI Z87.1 markings and optical ratings. After that comes the core reference material — a shade chart by process and amperage band covering stick welding, MIG and flux cored, TIG, air carbon arc cutting, plasma, oxy-fuel welding, oxygen cutting, brazing, and soldering. We will then settle the OSHA-versus-ANSI question, translate the chart into auto-darkening helmet settings, walk through the mistakes that send people to the eye clinic, and finish with a step-by-step shade selection workflow you can run in about fifteen seconds at the machine.

The Science Behind the Chart: What Welding Radiation Does to Eyes

A welding arc is one of the brightest light sources you will ever encounter outside a lightning strike, and it is not emitting visible light alone. The arc throws out a broad spectrum of radiation: ultraviolet (UV), infrared (IR), and intense visible light spanning from deep blue to blinding white. Your shade chart exists because all three of those bands attack the eye, and they do it at different speeds and in different layers of tissue. Understanding which hazard does what is the difference between treating a shade number as a annoying rule and treating it as the piece of equipment it really is.

Ultraviolet: the injury that happens in one second

Ultraviolet is the arc’s fastest weapon. Unprotected UV from a welding arc can damage the corneal epithelium in as little as one second of exposure, which is why a single careless glance without a hood is enough to cause real injury. The result is photokeratitis, commonly called arc eye, welder’s flash, or snow blindness. It is effectively a sunburn on the clear front surface of the eye.

The cruel part is the delay. According to the College of Optometrists clinical guideline, photokeratitis symptoms typically appear 6 to 12 hours after exposure and usually resolve within 24 to 48 hours. So the apprentice who finishes a shift feeling fine can still wake up that night with classic signs: pain, redness, photophobia, watering, and blurred vision. The arc already delivered its full dose; the nervous system just took its time reporting it. Clinical overviews such as EyeWiki’s photokeratitis entry describe the same pattern and confirm that repeated low-level episodes are common among welders who skip or skimp on filtration.

Infrared: the slow, deep burn

Infrared behaves differently. Because of its longer wavelength, IR penetrates deeper into ocular tissue than UV does, passing the cornea and reaching the lens and retina. Long-term exposure is associated with elevated cataract risk, and the damage is cumulative rather than instant. You will not feel IR building up, which is exactly why welders who run a shade that is “good enough” for a short bead on mild steel sometimes develop symptoms years later and never connect the two. Processes that push a lot of thermal energy, like air carbon arc gouging covered in our Air Arc Welding and Carbon Arc Gouging guide, are especially demanding on filtration because of the combined radiant heat and light output.

Visible light and blue light: glare, fatigue, and retinal strain

The visible portion of the arc is what your eyes react to instinctively. High-intensity visible blue light contributes to retinal strain and is the main driver of glare and visual fatigue during long welds. This is also why shade comfort matters, not just legality: a lens that is technically compliant but leaves you squinting through a white-hot puddle will push you toward bad habits, like lifting the hood to peek or welding with your face too close to the arc. A properly chosen shade lets you watch fluidity and arc length instead of fighting the light, which is a point our Aluminum MIG Welding: The Complete Practical Guide returns to repeatedly, since aluminum reflects enough arc light to sting unprotected skin nearby.

Bystanders and helpers are exposed too

None of this is limited to the person holding the stinger. Fitters, tackers, supervisors, and shop visitors all sit inside the same UV field, and UV reflects off concrete, mill scale, and shiny base metal. OSHA addresses this directly in its eye protection fact sheet on welding, emphasizing protective screens and appropriate filter lenses for anyone exposed to the arc, not just the welder. A helper standing two feet away with clear safety glasses is receiving UV that their lenses were never rated to stop.

The numbers behind the risk

The stakes are not abstract. A 2020 study indexed in PubMed Central reported a 47.9% overall prevalence of eye injuries among welders, rising to 73.7% among electric and arc welders. On the wider occupational side, NIOSH reports that roughly 2,000 U.S. workers sustain job-related eye injuries every day, with welding among the leading contributors. The shielded metal arc trades we discuss in our Advantages of Stick Welding article illustrate the trade-off well: stick gives you penetration and versatility in exchange for the most aggressive arc light of any common process, which is precisely why the chart assigns it the darkest shades.

That is the real function of the welding shade chart. It translates three invisible hazards, UV, IR, and blue-heavy visible light, into a single number you can verify before you strike an arc. Everything that follows in this guide is about reading that number correctly.

How to Read a Welding Shade Number Scale

A shade number is not a brightness dial. It tells you how much light a filter lens passes to your eyes, and each step up blocks noticeably more than the one below. The scale is deliberately non-linear: shade 9 to 10 cuts far more transmitted light than shade 2 to 3. You cannot eyeball a lens and guess its rating, so the printed number on the glass is the only number that counts. In practice the scale runs from nearly clear shade 1.5–2 for torch and soldering work, through shades 4–6 for oxy-fuel processes, into shades 8–13 for arc welding and cutting, and tops out near shade 14 for heavy air carbon arc and gouging work.

Minimum Shade vs. Suggested Shade: Two Numbers for the Same Job

The single most confusing thing about a welding shade chart is that many versions show two columns for one amperage range. The difference is not a contradiction, it is two organizations answering two different questions.

OSHA’s “minimum protective shade” is the legal floor, the darkest-numbered filter the agency considers the least you may legally wear at that current. Employers in general industry and construction must meet it under 29 CFR 1926.102. It is written for compliance, not comfort.

ANSI/AWS “suggested shade” comes from the consensus standard ANSI/AWS Z49.1, Safety in Welding, Cutting and Allied Processes, which most employers voluntarily adopt and which OSHA frequently references as recognized industry practice. It sits one or two shades darker at the same amperage, absorbing glare and reducing eye fatigue over a full shift.

SMAW (Stick) Amperage	OSHA Minimum Shade	ANSI/AWS Suggested Shade
60–160 A	8	10
Above 160–250 A	10	12

At 150 amps, shade 8 is legal, but shade 10 is what the consensus standard tells you to actually wear. The gap between the columns is comfort headroom, so the practical strategy is to start from the ANSI/AWS suggested shade rather than the OSHA minimum. There is one recognized exception: filters may be lighter than the listed shade when the arc is physically hidden from your view by the workpiece or the joint geometry, a footnote carried in Z49.1 for out-of-position and restricted-visibility work.

What Actually Drives the Number: Process and Amperage

Amperage is the master variable. As arc current climbs, the arc’s intensity rises with it, so the shade must climb alongside, which is why charts are indexed by amps first and everything else second. Electrode diameter works as a shortcut in casual conversation, but only as a rough proxy: a 1/8-inch rod can run anywhere from 90 to 150 amps depending on polarity and position, so picking a shade by rod size alone is how people end up under-protected. Read the machine dial or the WPS range, then look up the current. If you run stick, our Advantages of Stick Welding: Why SMAW Still Wins guide covers how much current varies across positions and plate thicknesses.

Process matters second because arc voltage, shielding atmosphere, metal transfer mode, and arc length all change how much visible, ultraviolet, and infrared radiation leave the arc, even at identical amperage. The same 180 amps in a short-circuit MIG transfer does not produce the same glare as 180 amps of stick welding on a long arc. Electrode chemistry matters too; see our Alloy Steel Welding Electrodes: Selection, Use & Safety notes on how classifications change running characteristics before you buy rods.

Reading ANSI Z87.1 Markings and Optical Ratings

A shade number only means something if the lens is legitimate. Filter lenses must carry permanent manufacturer identification and the shade number marked on them, and they must meet the ultraviolet, luminous (visible), and infrared transmittance limits in ANSI Z87.1 as referenced by OSHA. A scratched, unmarked, or faded lens of unknown origin fails all three tests at once, so treat a blank lens as scrap regardless of how dark it looks.

Beyond the shade number, Z87.1 rates filters on optical quality: how much the lens diffuses and distorts light, plus its UV and IR attenuation performance. These show up as a short code on compliant filters, such as 1/1/1/1, where lower digits mean tighter control and a sharper view of the puddle. Welders chasing precise arc control in Aerospace TIG Welding: Standards, Techniques, and Training style work care about this more than shade alone: a distorted filter makes you subconsciously lean and tilt, wrecking your body position before your eyes ever tire.

With the scale readable, the next question is what each process demands, from SMAW and MIG through plasma and oxy-fuel, which is exactly what the chart in the following section lays out.

Welding Shade Chart by Process: SMAW, MIG, TIG, Stick, Plasma and Oxy-Fuel

This is the part of the shade chart welders actually use at the machine. Every process produces a different arc spectrum and a different intensity, so the filter you can get away with on a 40-amp tungsten arc will not protect you on a 450-amp stick bead. Read across the row for your process, find your amperage band, and you have your minimum legal shade plus the comfort shade most welders settle on.

Arc Welding Processes: Shades by Amperage

Process	Arc current / band	OSHA minimum	ANSI/AWS suggested
SMAW (stick)	Under 60 A	7	—
	60–160 A	8	10
	160–250 A	10	12
	250–550 A	11	14
GMAW / FCAW (MIG, flux core)	Under 60 A	7	—
	60–160 A	10	11
	160–250 A	10	12
	250–550 A	10	14
GTAW (TIG)	Under 50 A	8	10
	50–150 A	8	12
	150–500 A	10	14
Plasma arc welding and cutting	General arc work	8–11 (follow current band)	12–14
Air carbon arc cutting (gouging)	Typical gouging currents	14	14
Carbon arc welding	Listed in OSHA Table E-1	14	14

Shielded metal arc welding is where most apprentices get burned. The chart steps from shade 7 below 60 amps to shade 11 at the heavy end, and the jump from 10 to 11 between the 160–250 and 250–550 bands is the most ignored line in the table. If your eyes ache after a day of fillet welds on plate, you usually ran a comfortable shade 10 where the chart wanted 11 or 12. Our advantages of stick welding guide covers why SMAW still dominates structural work despite the eye-protection demands it places on the operator.

Gas metal arc and flux cored welding hold a flat OSHA minimum of 10 from 60 amps to 550, while the suggested shades climb 11, 12, then 14. That flat floor is worth understanding: the argon or argon-CO₂ shield suppresses some of the shorter-wavelength ultraviolet a flux coating would scatter, but the concentrated wire arc is bright enough that 10 is treated as the floor for any real production current. Anyone running aluminum MIG welding should note that aluminum is often welded at the higher end of the current band, which pushes you toward the darker suggested shades rather than the minimum.

Gas tungsten arc welding starts at shade 8, one shade darker than stick under 50 amps, because the tungsten arc is an extremely intense point source even at low current. Below 150 amps the OSHA minimum stays at 8, but the suggested column jumps to 10 and then 12, reflecting the fact that TIG welders work closer to the arc and hold position for longer, uninterrupted passes. Precision work in aerospace TIG welding adds another wrinkle: tighter fit-up and longer observation time make comfort shades matter more, not less.

Plasma, Carbon Arc, and the Gas Processes

Plasma arc welding and cutting use a constricted, high-velocity jet that produces a hotter, brighter column than an open arc, so plasma sits at the darker end of its current band. For cutting work, treat the amperage of the plasma unit the same way you would a stick machine and never go below shade 8 at light settings.

Air carbon arc cutting is the exception that proves the rule. OSHA lists carbon arc welding at shade 14, and gouging with a carbon electrode belongs in that same category. The arc is unshielded, smoky, and extremely rich in ultraviolet, and the operator works with the arc open to the atmosphere rather than tucked under a joint. This is one of the few jobs where the darkest filter in the box is the correct one, as our air arc welding and carbon arc gouging guide explains in more detail.

Gas process	Condition	OSHA minimum	ANSI/AWS suggested
Oxy-fuel gas welding	Up to 1/8 in material	4	5
Oxygen cutting	Over 1/2 in	5	6
Torch brazing	General	4	4–5
Soldering	Listed in OSHA Table E-1	2	2
Gas-shielded arc, nonferrous	1/16–5/32 in electrode	11	—
Gas-shielded arc, ferrous	1/16–5/32 in electrode	12	—

Oxy-fuel work looks trivially safe by comparison, and shade 4 or 5 is genuinely enough for flame welding under 1/8 inch and for light cutting. But oxygen cutting over 1/2 inch still calls for a minimum of 5 with 6 recommended, because a heavy preheated cut throws off molten slag and a much larger luminous flame. Soldering sits at shade 2, the lightest entry in the chart, which is why a soldering iron never needs a welding helmet at all, only basic eye coverage against splashes.

Why Gas-Shielded Processes Run a Shade Darker

Two things push MIG, flux core, and TIG toward darker filters. First, arc concentration: a consumable-wire or tungsten arc focuses its energy into a much smaller area than a flux-covered stick electrode, so more of that intensity reaches your eye through the same lens opening. Second, shielding gas does not scatter ultraviolet the way a flux coating does, so the radiation that does leave the arc arrives in a tighter, more direct beam instead of a diffuse glow. The practical result is a brighter-looking arc at the same nominal amperage, and the chart compensates by setting the floor at 10 rather than 8.

Flux core deserves a separate mention because the aluminum flux core welding process combines both characteristics: a gas-like arc profile with a flux that produces its own visible glare and spatter. For anything beyond light gouging, follow the GMAW/FCAW row and move up the suggested column as current rises. The full consensus table is published in ANSI/AWS Z49.1, Safety in Welding, Cutting, and Allied Processes, and OSHA’s eye protection during welding fact sheet restates the minimums for employers.

The takeaway is simple: match the row to the process, match the column to the current you actually dialed in, and when you are between bands, choose the darker shade. A complete welding lens shade chart from AWS is worth printing and taping inside your toolbox lid, because the number you need is rarely the number you remember. Next we will look at what happens when OSHA’s floor and ANSI’s recommendation disagree, and which one actually controls your workplace.

OSHA Minimums vs. ANSI/AWS Recommendations: Which Rule Applies

Every fabrication shop carries two kinds of authority on the wall: the OSHA regulation, written in the mandatory language of federal law, and the consensus standard, written by industry committees as best practice. Welders confuse the two constantly, and the confusion surfaces at the worst moments — during an inspection, after an injury, or when a supervisor insists the posted chart “is just a suggestion.”

The short version: OSHA sets the legally enforceable floor. ANSI and AWS set the professional standard of care, and in practice they pull you well above that floor.

The Legal Floor: What OSHA Actually Enforces

In general industry, welding, cutting, and brazing fall under 29 CFR 1910.252, which carries the fire-protection requirements for hot work along with filter lens guidance. In construction, eye and face protection requirements live in 29 CFR 1926.102, and arc welding and cutting operations are addressed directly in 29 CFR 1926.351. Both settings include a filter lens shade table, and both are backed by 29 CFR 1910.133, which requires eye and face protection wherever a reasonable probability of injury exists without it.

Those tables are what people mean by “the OSHA shade chart.” They list processes and amperage ranges alongside a minimum recommended filter shade. An OSHA fact sheet on eye protection during welding summarizes it plainly: the table is a starting point, and protection must be selected for the specific task in front of you.

What Table E-1 Says — and What It Quietly Permits

OSHA’s Table E-1, reproduced in both the general industry and construction standards, lists minimum filter shade numbers by process and current. The critical sentence is the one most welders skim past: shades darker than those listed may be used to suit the individual’s needs. The table is a floor, not a ceiling. A welder running 250 amps of stick who finds the listed shade uncomfortable breaks no rule by stepping up one or two shades, and no inspector will cite them for it.

That clause settles most fab-shop arguments. Darker is always defensible; lighter than the table is a violation. It also explains why processes listed with wide ranges — such as air carbon arc cutting, where current and arc length swing widely — need judgment applied, not just a number copied off the card.

The Shipyard Exception: Stacked Filters Count

Shipyards operate under a different subpart, and 29 CFR 1915.153(a)(4) adds a wrinkle that surprises people. In shipyard employment, the combined shade numbers of the eyewear filters worn under the helmet and the helmet’s own filter lens are expected to equal the required shade value. This matters because wearing shade-tinted safety glasses beneath a welding helmet is common on hull work. Under the shipyard rule, those tinted glasses count toward your total, so a shade 10 helmet over shade 5 glasses is not a simple shade 10 job — it is a stacked system, and the combined value is what gets evaluated. If you work marine structural or aluminum boat welding alongside helmet tints, verify the total rather than trusting the number stamped on the cartridge.

The Consensus Standard: ANSI Z49.1 and AWS F2.2

While OSHA defines the legal minimum, the industry reference is ANSI/AWS Z49.1, Safety in Welding, Cutting, and Allied Processes, published by the American Welding Society and incorporated into AWS F2.2. AWS publishes Z49.1 as a free download, so there is no excuse for working from a photocopy torn out of a 1990s textbook.

Z49.1 goes further than OSHA’s tables in several practical ways. It requires that work arrangements prevent direct viewing of the arc without filter protection and that nearby viewers be shielded from sparks, slag, and radiation. It references ANSI/ISEA Z87.1 for lens and spectacle performance — impact, optical quality, and marking — the standard behind the “Z87” stamp on your safety glasses and cover lenses. Z49.1 also gives both a minimum shade and a suggested shade range for each process, offering a target rather than a bare legal floor.

Many employers, including those in aerospace welding and other specification-driven work, adopt Z49.1 as written and cite it in their safety programs. When that happens, the consensus standard becomes binding on you as a condition of employment even though OSHA did not write it.

Which Rule Wins: A Quick Comparison

Question	OSHA (1910.252, 1926.102)	ANSI Z49.1 / AWS F2.2
Is it legally enforceable?	Yes, with citations and fines	Becomes binding when adopted in your safety program
What does it specify?	Minimum filter shade per process and amperage	Minimum and suggested shades, viewing arrangements, lens performance
Can you go darker?	Yes, expressly permitted by Table E-1	Yes, encouraged for comfort and safety
Does it cover bystanders?	Implied through fire and hot-work rules	Explicitly requires shielding nearby viewers
Cost to access	Free online	Z49.1 available free from AWS

The hierarchy is obvious once you read the table. OSHA tells you the least you are allowed to do; ANSI/AWS tells you how the work is actually supposed to run. Treat the OSHA number as a target and you will pass an inspection while still gambling with your eyesight. Treat Z49.1 as the working standard and you cover both the legal requirement and the professional one — with no argument about which rule applies.

Auto-Darkening Helmets and the Shade Chart: ADF Settings Explained

If you learned to weld on battered pipe hoods, an auto-darkening helmet can feel like cheating. But an ADF does not replace the shade chart. It puts the chart inside your helmet, as a dial. Get the dial right and the helmet protects you exactly as a passive lens would. Get it wrong and you have bought an expensive window that darkens to the wrong number.

How an Auto-Darkening Filter Actually Works

An auto-darkening filter is a sandwich. Two polarized glass lenses frame a layer of liquid crystal, backed by a light sensor, a control circuit, and a pair of backup capacitors. In the light state the crystals align so light passes through at roughly shade 3 or 4. When the sensor detects the spike of arc radiation, the circuit twists the crystals down to your preset dark shade, in a fraction of a millisecond.

That is faster than the human blink reflex. Advertised response times for modern helmets run from about 1/25,000 of a second (0.04 ms) up to 0.1 ms, according to typical manufacturer specifications — the lens is dark before your eyelid has started to move.

Reading the Shade Range on an ADF

Most variable-shade helmets advertise a dark-state range of roughly DIN shade 5 through 13, with budget models often starting at shade 9 or 10. Split ranges like 4/9–13 simply mean a light grind state at shade 4 and a variable welding range of 9 to 13. A ceiling of 13 covers nearly every arc process an everyday welder sees, including high-amperage stick and flux core.

The habit is unchanged from a passive hood: look up the minimum shade on the chart for your process and amperage, then set the ADF to that number or slightly darker. If the chart says shade 10 for a 150-amp stick bead, setting the dial to 13 is not “safer” — it just means you cannot see your puddle and will likely lift the hood mid-weld.

The Controls That Tie Back to the Chart

Each ADF control affects how faithfully the helmet follows the shade chart:

• Shade selector. Your link to the chart. Set it per job, process, and amperage, not once per week.
• Grind mode. Holds the lens light at shade 3–4 for grinding, fitting, and marking without flipping the hood. Some helmets switch automatically when a spark stream hits the sensors, others by hand; switch back before you strike an arc.
• Sensitivity. How much light triggers darkening. Raise it in bright shop or outdoor light, and again for low-amperage TIG, where a thin tungsten at 40 amps may never trip a factory-set sensor.
• Delay. How long the lens stays dark after the arc dies. Long for downhill stick and multi-pass work where the puddle stays incandescent; short for fine TIG when you want to inspect the bead right away.
• Response time. Fixed by the electronics, usually 1/25,000 to 1/10,000 of a second — nothing to adjust, but worth comparing when buying.

Sensors matter too: cheap lids use two, better ones three or four, which limits “sensor shadowing” when a hand, fixture, or corner joint blocks one mid-bead.

Optical Clarity Ratings: The Four-Digit Code

Auto-darkening filters carry a four-digit optical rating covering light diffusion, luminous transmittance non-uniformity, angular dependence, and variable shade transmittance. Anything at 1/1/1/2 or better marks a genuinely clear lens. The first digit is the one welders notice: it governs image scatter, which is what makes a cheap lens feel milky over an eight-hour shift. The shell should also carry an ANSI Z87 impact and optical marking.

Power: Hybrid Solar and Battery

Most field helmets run on hybrid power: solar cells that trickle-charge a replaceable lithium cell, usually a CR2450, while the panel runs the electronics during the arc. That stretches battery life to years rather than months. If the lens fails to darken, check the battery before you curse the electronics.

Setting the ADF So It Satisfies the Chart

The workflow is identical to a passive hood, only faster. Thin-aluminum TIG often charts to shade 8 at 20–60 amps, so set the ADF to 8 or 9 and raise sensitivity until the arc trips the sensors reliably. Raise the amperage and the helmet follows, because the filter darkens to whatever number you set. That flexibility is why an Aerospace TIG Welding shop, where one welder might run 25 amps one hour and 180 the next, gravitates toward ADF helmets.

The same logic scales up. Heavy flux core or stick work pushes you toward the top of the range, and an Alloy Wheel Welding job can run from finesse TIG to crack-out grinding in the same afternoon. Even Air Arc Welding and Carbon Arc Gouging — one of the brightest, most violent arc processes — is manageable on a quality variable-shade helmet, provided you set the top of the range and cover your neck and arms.

The bottom line: treat the ADF dial as your shade chart lookup, and reset it every time the process or amperage changes. The helmet will do the rest.

Common Welding Shade Chart Mistakes and How to Fix Them

Even experienced welders fall into habits that quietly put their eyesight at risk. The numbers on a welding shade chart are not suggestions; they are a guide built to protect against ultraviolet, infrared, and visible light. Here are the most common shop-floor mistakes, how to spot them, and how to correct them.

1. Using One Fixed Shade for Every Job

Many welders get comfortable with a single shade and run the same lens for every task. Different processes and amperages emit drastically different levels of radiation, so what works for one job can be far too light for another.

• The Problem: A shade perfect for low amperage TIG work offers nowhere near enough protection for high amperage structural jobs.
• The Fix: Treat each job individually. Before you strike an arc, identify the process and amperage, then reference the correct shade. If you jump between processes often, a properly set auto-darkening helmet helps enormously.

2. Going Lighter Than the Minimum for Convenience

Dropping a shade to see the puddle better in tight positions is tempting, but never worth the risk. As the OSHA Eye Protection During Welding Fact Sheet notes, the minimum shade listed is what is required to protect the eyes from immediate and long-term damage.

• The Problem: A lens that is too light causes squinting, eye fatigue, and the risk of photokeratitis, commonly called arc eye.
• The Fix: Start at the minimum or suggested comfort shade and adjust only within safe ranges. If visibility is poor, the culprit is more likely your cover lenses, sensors, or technique, not the shade number.

3. Stacking an Unmarked or Damaged Filter

Some welders add a second filter under the helmet to get a darker shade. This is risky, especially when either filter is unmarked or damaged.

• The Problem: Stacking filters without accounting for combined shades can leave you below effective protection. Filters that are not OSHA compliant or marked to meet ANSI Z49.1 cannot be assumed to block UV and IR, no matter how dark they look.
• The Fix: Never stack random filters. Use only properly marked, compliant filters and select a single approved lens from the chart. If you need more darkness, move to the next approved shade for your process.

4. Wearing Shade-Graded Safety Glasses Under a Passive Helmet Without Adjusting the Total

Welders who wear prescription or task glasses under a passive helmet need to be aware of their tint. Shade-graded glasses are rated for specific operations, but paired with a passive lens, the total effective shade changes.

• The Problem: Failing to factor in the glasses underneath can produce an over-darkened view or, in rarer cases, improper filtration depending on the combination.
• The Fix: Check your employer’s safety policy and applicable standards such as OSHA 1926.102. When in doubt, verify visibility and protection with a qualified safety professional. For precision processes like Aluminum MIG Welding, clear vision paired with correct protection is paramount.

5. Ignoring Bystander Protection

Arc radiation does not stop at the helmet. Helpers, fire watches, and nearby workers are all susceptible to eye damage, which is why NIOSH’s Eye Safety guidelines stress protection for every exposed individual.

• The Problem: Observers assume distance equals safety, not realizing reflected and direct light can still cause arc eye.
• The Fix: Use welding curtains, portable screens, and approved filter lenses for bystanders. OSHA applies the same shade requirements to observers as to the welder.

6. Using Scratched Cover Lenses

Cover lenses are the first line of defense for your filter, but over time they pit, haze, and fill with spatter. This is one of the most overlooked mistakes in the shop.

• The Problem: Scratched, dirty cover lenses scatter light and cut visibility, prompting welders to subconsciously drop their shade just to see the pool, defeating the protection entirely.
• The Fix: Inspect cover lenses before every shift and replace them at the first sign of damage. Inexpensive replacement packs let you keep your correct shade and still see your work clearly, which matters on detail work like Alloy Wheel Welding.

7. Picking a Shade by Electrode Size Alone Instead of Amperage

The most prevalent mistake is basing shade on electrode diameter while ignoring arc current. Electrode size is a reference point, but it is not what drives radiant output.

• The Problem: Two welders can run the same electrode at very different amperages. A stick electrode at the low end versus the high end of its range produces a large difference in UV and IR output, a point worth keeping in mind when reading resources like the Advantages of Stick Welding guide.
• The Fix: Use the machine’s amperage setting as your reference, not electrode size. Cross check the set amperage against the chart’s amperage bands to select the correct minimum shade, and when unsure, err toward the suggested shade for that band until you can safely verify visibility.

Eliminating these mistakes means meeting OSHA and ANSI safety requirements while protecting your vision for a lifetime of welding. Taking an extra moment to verify your shade always outweighs the pain of an avoidable eye injury.

Passive vs. Auto-Darkening vs. Powered Helmets: A Practical Comparison

The shade chart doesn’t care which helmet you wear, but your neck, your budget, and your weld quality do. Once you know how to look up a shade number, the next question is which gear actually delivers it day after day. Welders choose between three systems: fixed-shade passive helmets, auto-darkening helmets, and powered air-purifying respirator (PAPR) systems. Each satisfies the chart differently, with trade-offs worth understanding before you spend money.

Passive Helmets: Simple, Cheap, and Manual

A passive helmet is the classic “pipeliner” style shell with a single fixed filter plate that darkens permanently. No electronics, no battery, nothing to fail at 2 a.m. on a jobsite. The catch is that the shade is baked into the lens you install. If the chart calls for shade 11 on today’s 130-amp MIG work and shade 13 on tomorrow’s 300-amp stick beads, you physically swap filter plates between jobs.

That means a working welder owns a small library of plates, commonly shade 10, 11, and 12 at minimum, plus darker shades like 13 or 14 for heavy structural stick and air carbon arc cutting. Plate changes are quick, if the right plates are on hand. Passive helmets also demand the “nod” technique: you strike an arc only after dropping your head, then flip the hood up between passes. It works, but it costs neck fatigue over an eight-hour shift and invites the shortcut of lifting your hood to peek at the arc.

Auto-Darkening Helmets: The Chart, Handled Automatically

An auto-darkening filter (ADF) starts in a light state, typically shade 3 or 4, and switches to your preselected dark shade within a fraction of a millisecond of arc detection. Set the selector to the shade the chart gives you for that process and amperage, and the helmet keeps you compliant without nodding or flipping. The arc stays in view continuously, which makes stack-starting, TIG puddle control, and out-of-position work noticeably easier, with less neck strain. OSHA’s eye protection guidance for welding accepts properly shaded auto-darkening filters as compliant PPE, provided the shade meets the requirement.

The trade-offs are cost, complexity, and range. A quality ADF costs several times what a passive shell does, and it adds batteries, sensors, and an LCD cartridge to maintain. Budget helmets are the real trap: a cheap ADF with a narrow range, say shade 9 to 13, or slow sensors may never cover the shade 13 to 14 work that heavy stick welding and air carbon arc gouging demand, while its sensors can be tricked by sunlight or a blocked arc. For light-amperage work like aerospace TIG welding, an ADF with a low shade floor near 4 or 5 matters, because many passive plates are too dark to see a 40-amp arc at all.

PAPR Systems: Air and Protection, at a Price

A welding PAPR pairs a hood with a battery-powered blower that pushes filtered air across the welder’s face. These systems solve two problems at once: they deliver the filter shade the chart requires and they protect lungs from welding fume, which ANSI/AWS Z49.1 treats as a first-class hazard alongside radiation. Welders in confined spaces, on stainless or coated metals, or with a medically prescribed respirator requirement are the natural candidates.

The costs are real. PAPR rigs are the most expensive option, the blower adds weight on the belt or helmet, and you now have batteries, hoses, and HEPA or particulate cartridges to inspect and replace on a schedule. A dead battery means no airflow, so maintenance discipline matters as much as the shade setting.

Factor	Passive	Auto-Darkening	PAPR System
Shade flexibility	One shade per plate; swap plates	Adjustable across its rated range	ADF headgear, adjustable
Approximate cost	Lowest	Moderate to high	Highest
Weight	Light	Moderate	Moderate to heavy with blower
Maintenance	Nearly none	Batteries, cover lenses, sensors	Batteries, filters, cartridges
Respiratory protection	No	No	Yes
Best suited to	Budget work, single-process shops	Multi-process, high-volume welding	Fume-heavy and confined work

Which One Best Serves a Multi-Process Welder?

For a welder who moves from thin sheet to heavy plate in the same shift, an auto-darkening helmet with a wide range, at least 9 to 13 with a low grind mode, is the practical winner. Verify that it carries the ANSI Z87.1 marking required for eye protection, confirm its upper limit covers your darkest process, and treat the shade selector as a compliance control, not a comfort preference. Keep a passive helmet with a shade 13 plate as backup for gouging and heavy stick work, and move to a PAPR when fume exposure, not shade, becomes the limiting hazard. Whatever you wear, the chart’s number is the number.

How to Choose and Set Your Filter: A Step-by-Step Shade Selection Workflow

Reading a welding shade chart once is easy. Running the same seven-step routine every time you set up a machine is what actually keeps your eyes healthy. The chart only protects you if you consult it deliberately, in the same order of operations, whether you are running 30-amp micro TIG on thin stainless or 500-amp stick on heavy plate. Here is the workflow, in order, at the start of every job.

Step 1: Identify the Process Before You Touch the Machine

The chart is organized by process, not by job title, so the first question is always “what arc am I about to strike?” Shielded metal arc welding, gas metal arc welding, flux cored arc welding, gas tungsten arc welding, plasma arc cutting, air carbon arc gouging, and oxy-fuel all occupy different rows because they emit different intensities of ultraviolet, infrared, and visible light at the same current. A given amperage on stick welding demands a noticeably darker filter than the same amperage on TIG, because the flux coating burns and throws extra light. Carbon arc gouging sits on its own row again, and it is one of the brightest processes in the shop. Identify the process first, and the chart narrows to a single row.

Step 2: Read the Actual Amperage Off the Power Source

Walk to the machine and read the dial or digital display. Do not estimate from electrode diameter, and do not trust the paperwork from the last job. Rod size suggests a range, but position, travel speed, material thickness, and the specifics of alloy steel welding electrodes all push the real setting up or down within it. The chart keys off amperage because amperage is what drives arc energy. The welder who guesses low here is the one who ends up with gritty, light-sensitive eyes.

Step 3: Look Up the Minimum, Then Add Comfort Headroom

Find your process row, then the column that brackets your amperage. That cell gives you the minimum filter shade. OSHA’s eye protection fact sheet treats that number as the legal floor, while ANSI Z49.1 and AWS F2.2 provide suggested shades that add comfort headroom. If weld zone visibility allows, move up one shade toward the suggested value. In bright shop conditions, out-of-position work, or long continuous beads, that extra shade is where the comfort comes from. For minimum versus suggested values, revisit the process shade tables earlier in this guide.

Step 4: Verify the Markings on the Filter Itself

Hold the lens up and read it. A compliant filter carries the shade number, the manufacturer’s identification, and the ANSI Z87.1 marking stamped or printed on it. No marking means no proof, and an unmarked dark lens from a loose parts tray is exactly how apprentices get burned. Check for cracks, deep scratches, and delamination at the same time. A scratched cover lens is a cheap two-minute replacement; a compromised filter is not a gamble worth taking.

Step 5: Test the ADF, Then Check the Batteries

If you run an auto-darkening helmet, test the sensors before every shift. Hold the helmet at arm’s length, cover one sensor with a finger, and trigger it with a spare filter held against the back. The lens should darken instantly and clearly. Weak or intermittent darkening means low batteries, dirty sensors, or a failing cartridge. Carry spares: a battery that dies mid-shift leaves you with an unusable helmet or the very bad habit of lifting the hood and looking at the arc unprotected.

Step 6: Protect the People Who Are Not Welding

Shade selection does not stop at your own hood. Helpers, fitters, and anyone walking past are exposed to the same arc flash, and they are not wearing a filter. Set up welding screens or curtains before you strike an arc, and source them from a proper supplier such as Airgas welding supplies rather than improvising with cardboard. Transparent welding screens are addressed separately under AWS F2.3, which is why they carry their own shade and transparency ratings instead of sharing the filter chart. TIG shops working to tight visual standards will find the same bystander discipline covered in our aerospace TIG welding guide.

Step 7: Re-Check After Any Change

Every time you swap a filter, change processes, or move to a different machine, walk the workflow again. Shade selection is not a one-time setup task; it is a habit. And when something feels wrong through the lens, remember the rule of thumb: if you cannot see the weld zone clearly, go lighter one shade at a time, but never below the listed minimum. That minimum exists because the arc’s invisible radiation keeps doing damage whether or not you can see it, which is precisely why NIOSH includes eye protection in its PPE guidance for welding work.

Practical Tips, Maintenance and Final Takeaways

Knowing the chart is only half the job. The other half is keeping your helmet, lenses and habits in a condition where the right shade actually reaches your eyes. Welding helmets live in truck boxes, on top of machines and in the corners of hot shops, and they pick up damage fast. A few inexpensive routines protect your investment and your vision.

Small Maintenance Habits That Protect Your Vision

• Store lenses in a case, not loose. A filter lens rolling around a toolbox collects grit, and grit turns into scratches that scatter light. Keep spare cover lenses and filter plates in a padded pouch or original sleeve.
• Treat cover lenses as consumables. The clear outer cover plate is designed to take the abuse so the expensive filter does not. Replace it when it is hazy or deeply scratched, not when it falls off. A scratched lens forces you to squint, and squinting is the first step toward dropping to a shade that is too light for the job.
• Keep the helmet shell away from heat. Plastic shells warp and degrade near hot work, and a warped shell can unseat your lens. Store the helmet off the floor and away from preheat flames, curing ovens and stacked plate.
• Inspect gaskets and headgear. A loose lens rattle means UV can leak around the filter. Replace worn gaskets and tighten the lens frame before the arc, not after.

Train Apprentices on the Chart, Not on Tradition

New welders learn shade selection from whoever is standing next to them, which means bad habits transfer as efficiently as good ones. That apprentice from the opening story did not choose shade 10 on a whim; he copied the tray. Employers are responsible under OSHA’s eye and face protection standard for providing protection where injury from radiation, flying particles or chemical splash is reasonably probable, and that obligation includes making sure workers know how to use what they are given.

The most effective training is a two-minute drill at the machine. Before an apprentice strikes an arc, have them state the process, read the amperage setting, name the minimum shade from the card and explain which cover lens is fitted. Repeat it until the process-plus-amperage lookup becomes reflexive. If your shop runs gouging or carbon arc work, make sure the training covers those higher-shade jobs too; the air arc welding and carbon arc gouging process demands noticeably darker filters than ordinary stick welding at the same current.

Shade Is One Piece of the PPE Puzzle

A correct lens does nothing for the rest of your body. Welding PPE is a system:

• Gloves and flame-resistant clothing sized for the process and free of oil or grease contamination.
• Hearing protection for grinding, gouging and high-amperage stick work.
• Respiratory protection where ventilation is inadequate, from simple respirators to powered air systems used in specialized laser work.
• Bystander protection. Welding screens and curtains keep UV away from helpers and passersby; the AWS publishes AWS Z49.1, which addresses protection broadly, and a companion standard, AWS F2.3, specifically for transparent welding screens and curtains.

OSHA’s general construction eye and face protection requirements appear in 29 CFR 1926.102, and welding-specific ventilation and hot-work provisions sit in 29 CFR 1910.252. NIOSH’s eye safety guidance reinforces the same logic: match the hazard, then verify the equipment actually works.

The One Habit Worth Building

Strip away every table and standard in this guide and the logic collapses into a single sentence: process plus amperage gives you the shade, every time, on every job. Minimum shade protects you legally and physically; the suggested shade keeps you comfortable enough to see what you are doing. Verify the Z87.1 marking, keep the cover lens clear, re-check after any lens change, and never let convenience, tradition or a scratched plate talk you into a lighter filter than the chart allows.

Do that consistently and the moment you will never experience is the one this guide opened with: finishing a bead proud, then spending the night with gritty, light-sensitive eyes. The chart takes ten seconds to read. The alternative takes a lot longer to recover from.

Frequently Asked Questions

What shade number should I use for welding?

It depends on the process and amperage. Common stick welding at 60–160 A calls for at least shade 8 (ANSI/AWS suggests 10), while high-amperage stick or MIG work at 250–550 A requires a minimum of shade 10 and suggests shade 14. Look up your specific process in the chart before every job.

Is a shade 10 welding lens enough for everything?

No. Shade 10 covers a lot of mid-range stick, MIG, and TIG work, but OSHA lists it as inadequate for heavy electrodes and high-amperage work, and gas-shielded arc welding on ferrous metal calls for shade 12 under 1910.252. Higher-amperage work needs shade 11 to 14.

Can I use a darker shade than the chart recommends?

Yes, and OSHA explicitly allows it. Its table states that shades darker than those listed may be used to suit the individual’s needs, as long as you can still see the weld zone well enough to weld accurately.

What shade is best for TIG welding?

For GTAW under 50 A the minimum is shade 8 with shade 10 suggested, 50–150 A uses shade 8 minimum with shade 12 suggested, and 150–500 A uses shade 10 minimum with shade 14 suggested. Low-amperage TIG often needs a lighter shade so you can see the puddle.

What shade for oxy-fuel cutting and brazing?

OSHA minimums run from shade 3 for cutting under 1 inch up to shade 5 for cutting over 6 inches, with ANSI/AWS recommending 4, 5, and 6 respectively. Torch brazing typically uses shade 3 or 4, and soldering uses shade 2.

What shade do auto-darkening helmets usually cover?

Most auto-darkening filters offer a variable range from about shade 5 through 13 (some split into 4/9–13), which covers nearly every arc welding process when set correctly. Always set the shade dial to at least the minimum in the chart for your process and amperage.

Do bystanders and helpers need welding filters too?

Yes. OSHA states the shade requirement applies to observers such as fire watch and assistants as well as the welder, and ANSI Z49.1 requires protection for anyone viewing the arc. Welding screens and curtains provide this protection for people working nearby.

Does wearing safety glasses under my helmet change the shade I need?

It can. In shipyard employment, OSHA notes that when filter eyewear is worn under a welding helmet, the combined shade numbers should equal the required value, which may let you use a lighter helmet filter. For general work, keep the helmet filter at or above the chart minimum.