Hobart Inventor P40 Auto-Darkening Welding Helmet — Shade 9-13, 4 Sensors (771015)
$108.86
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EDITORIAL REVIEW: 4.6/5 WC Safety Review — the Hobart Inventor P40 Auto-Darkening Welding Helmet Editorial assessment by Steven Eaton, WC Safety editor, based on published Hobart specifications. We did not laborat...
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EDITORIAL REVIEW: 4.6/5 WC Safety Review — the Hobart Inventor P40 Auto-Darkening Welding Helmet
Editorial assessment by Steven Eaton, WC Safety editor, based on published Hobart specifications. We did not laboratory-test this product.
SHOP WELDING HELMETS →SHOP WELDING RESPIRATORS →
Hobart Inventor P40 Auto-Darkening Welding Helmet Overview
The Hobart Inventor P40 Auto-Darkening Welding Helmet (771015) is an auto-darkening welding helmet with a PureColor lens, a large 9.3 square-inch viewing area, four independent arc sensors, and a switching speed of 1/25,000 second. Its variable shade covers weld shade 9 to 13 with a grind mode at shade 3.
As the Hobart Inventor P40 (Hobart 771015), it is a shade 9-13 auto-darkening helmet. This auto-darkening welding helmet with grind mode is a PureColor welding helmet rated for low-amperage TIG down to 10 amps.
It uses analog controls for shade, sensitivity, delay, and grind, ergonomic ratchet headgear, and carries a two-year lens warranty. A welding helmet protects the eyes and face but is not a respirator — see the note below. Compare it with the ESAB Savage A40 and the Lincoln Viking 1840, see the field in best auto-darkening welding helmets, and browse the range in welding helmets.
Who This Helmet Is For
| Use case | Fit | Buyer guidance |
|---|---|---|
| MIG, stick, and flux-core | Strong | Weld shade 9-13 covers most work. |
| Low-amp TIG | Good | Rated to about 10 amps. |
| Grinding between welds | Strong | Dedicated shade 3 grind mode. |
| Welding fume exposure | Add a respirator | Helmet gives no respiratory protection. |
| Very low sub-10-amp TIG | Check rating | Confirm your lowest amperage triggers. |
A welding helmet protects the eyes, face, and head from arc light, sparks, and spatter — it does not protect your lungs. It is not a respirator and gives no respiratory protection, so welding fume, which can contain metals such as manganese or hexavalent chromium, needs a separate respirator or a powered-air (PAPR) welding system matched to the fume. Welding in a confined space is more serious still: the process can consume oxygen and release gases, creating an oxygen-deficient or IDLH atmosphere that requires supplied air or an SCBA, not just a filter. Always set the correct weld shade for your amperage, keep the lens clean and uncracked, and switch out of grind mode before you strike an arc. Learn more in best respirators to use with welding helmets and the welding helmets complete guide.
Pros & Cons
Pros
- Weld shade 9-13 plus shade 3 grind mode
- Four arc sensors; fast 1/25,000 s switch
- Large 9.3 sq-in PureColor view
- Low-amp TIG to about 10 amps
- Analog controls; two-year lens warranty
Cons
- No respiratory protection; add a respirator
- Weld range starts at shade 9, not 5-8
- Not for sub-10-amp micro-TIG
- Analog, not memory-preset digital controls
How It Compares
The Inventor P40 is a mid-range auto-darkening helmet. Weigh it against nearby options:
| Option | Shade | Sensors | Best for |
|---|---|---|---|
| Hobart Inventor P40 (this page) | 9-13 weld / 3 grind | 4 | General MIG, stick, low-amp TIG |
| ESAB Savage A40 | Verify on listing | Verify | Value auto-darkening helmet |
| Lincoln Viking 1840 | Wider range | 4 | Premium color-lens option |
Choose the Inventor P40 for a solid shade 9-13 helmet, the ESAB Savage A40 for value, or the Lincoln Viking 1840 for a premium lens. See best helmets for TIG, best helmets for MIG, and best helmets for beginners.
Specifications
| Brand / Model | Hobart Inventor P40 (771015) |
| Shade | Variable weld shade 9-13; grind mode shade 3 |
| Sensors / switch | 4 independent arc sensors; ~1/25,000 s switching |
| Viewing area | ~9.3 sq in (3.94 x 2.36 in); PureColor lens |
| Amperage / controls | Low-amp TIG to ~10 A; analog shade/sensitivity/delay/grind |
| Headgear / warranty | Ergonomic ratchet headgear; 2-year lens warranty |
Related Guides
best auto-darkening welding helmets, welding helmets complete guide, best helmets for TIG, best helmets for MIG, best respirators for welding, best helmets for beginners.
Related Resources
welding helmets welding respirators welding gloves welding safety glasses 3M 8212 welding respirator
Frequently Asked Questions
What shade range does the Hobart Inventor P40 have?
It has a variable weld shade of 9 to 13 and a grind mode at shade 3, with a light state around shade 3. Set the shade to the level appropriate for your process and amperage so the arc is comfortably visible without straining your eyes.
How many arc sensors does it have?
It uses four independent arc sensors for dependable arc detection, which helps the lens react reliably even when a sensor is partly blocked, such as out-of-position or tacking work. The lens switches in about 1/25,000 of a second.
Can I use it for TIG welding?
Yes. It is rated for low-amperage TIG down to about 10 amps, so it darkens on the low-current arcs common in TIG. Confirm your lowest working amperage is within that range for reliable triggering.
Does it have a grind mode?
Yes. A dedicated grind mode holds the lens at a light shade 3 so you can grind without the lens darkening. Switch back to weld mode before striking an arc, since grind mode does not darken for welding.
How big is the viewing area?
The viewing area is about 9.3 square inches, roughly 3.94 by 2.36 inches, which is a large wide-screen view for the class. A bigger window helps you see the joint and the surrounding work.
What is PureColor lens technology?
PureColor is Hobart's lens technology for a brighter, more natural color view in both the light and dark states, which reduces the green tint of older lenses. It can make the puddle and surroundings easier to read.
Is it a welding helmet or a respirator?
It is a welding helmet. It protects the eyes, face, and head from arc light, sparks, and spatter, but it provides no respiratory protection. Welding fume requires a separate respirator or a powered air (PAPR) welding system.
What controls does it have?
It has analog controls for shade, sensitivity, and delay, plus the grind switch. Sensitivity sets how easily the lens triggers, and delay sets how long it stays dark after the arc stops, which helps on hot metal and tacking.
Does it need batteries or is it solar?
Auto-darkening helmets in this class typically pair a solar cell with replaceable or internal batteries so the lens is powered while you work. Confirm the exact power system and battery type in the manual for this model.
Is the lens ANSI compliant?
US auto-darkening welding lenses are built to the ANSI Z87.1 welding-filter standard for shade and impact. Confirm the ANSI marking on the lens and that the shade suits your process, and replace the lens if it is cracked or pitted.
What is included and is there a warranty?
It comes with the ergonomic ratchet headgear and the analog-control auto-darkening lens, and Hobart lists a two-year lens warranty. Confirm the current inclusions and warranty terms on the listing before purchase.
Do I need other PPE with it?
Yes. Pair it with welding gloves, flame-resistant clothing, hearing protection where needed, and a respirator matched to your fume. The helmet is one part of a full welding-PPE setup, not the whole thing.
Written by Steven Eaton, WC Safety Editorial. Specifications sourced from Hobart published data. Compare the range in welding helmets.
WC Safety is an independent PPE review site; no paid placement. A welding helmet protects the eyes and face, not the lungs; match a respirator to your welding fume and never rely on the helmet for respiratory protection.
⭐ Rated 4.9★ on Amazon across 10 verified ratings (Amazon.com, Jun 2026)
Brand / Vendor
Hobart
Model / SKU
771015
Product Type
Welding Helmet
Price
$108.86 (Amazon)
Rating
4.67 / 5 — 3 reviews
Availability
Check current availability on Amazon
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Customer Reviews
★★★★★4.9 / 5· 11 ratings on Amazon
★★★★★
Nice quality hood, good adjustment features
I love the paint scheme and the vibe that goes with it. Very clear screen, other auto hoods I've had were a little hazy. I like the timer and shade adjustability as well. Very nice hood and I'd definitely recommend.
Verified Purchaser · June 17, 2 · ✓ Amazon Verified Purchase
★★★★★
Great hood for the price
Auto darkens great. Very comfortable. Very user friendly.
Verified Purchaser · April 17, · ✓ Amazon Verified Purchase
★★★★☆
change your shades fs!
i love it for my shop welding.
Verified Purchaser · September · ✓ Amazon Verified Purchase
Showing 3 of 11 Amazon reviews.
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