TIG Torch Heads WP-17 vs WP-18 vs WP-26: Which One to Buy

WP-17, WP-18, WP-26 — three of the most common air-cooled and water-cooled TIG torch heads on the market, and the source of endless confusion in welding forums. Pick the wrong one and you'll either melt your torch (under-rated) or pay for cooling capacity you don't need (over-rated).

This guide breaks down what each WP-series head is built for, how they actually differ, and which one belongs on your bench.

Quick Comparison Table

Model	Cooling	Max Amperage	Duty Cycle	Best For
WP-17	Air	150 A	35% @ 150A	Hobby + light fab (1/8" steel and under)
WP-26	Air	200 A	60% @ 200A	Pro shop, daily-driver air-cooled
WP-18	Water	350 A	100% @ 350A	Production work, heavy steel/aluminum, automation

WP-17 — The Hobbyist's Workhorse

The WP-17 is the entry-level air-cooled TIG head and the most common torch shipped with budget welders. It's rated for 150 amps at a 35% duty cycle (3.5 minutes of welding per 10-minute cycle), which makes it perfect for:

• Welding 1/8" mild steel or thinner
• Aluminum up to 1/8" with proper AC/HF setup
• Stainless tube and sheet metal work
• Repair welding and hobby fabrication

The WP-17 has a slim neck, which makes it nimble in tight spaces — a real advantage for tube and frame work. The trade-off: that thin neck heats up quickly. If you're running long beads above 100A, expect the handle to warm up and the duty cycle to bite.

Buy WP-17 if: you're doing project welding, hobby fab, or repair work and you'd rather have light maneuverability than raw amp capacity.

👉 Shop our TIG Torch Head WP-17 (Head Only or Full Assembly with Collet Kit)

WP-26 — The Daily-Driver Air-Cooled

The WP-26 is what most professional shops actually use as their everyday air-cooled torch. It's rated for 200 amps at 60% duty cycle — meaning you can lay down long beads at 150A all day without needing to stop and let the head cool down.

The body is larger and has more thermal mass than the WP-17, which is what gives it the higher duty cycle. The neck is also slightly thicker, so it loses some maneuverability for the gain in capacity.

Where WP-26 shines:

• Daily fab shop work on 1/4" steel and below
• Aluminum up to 1/4" thickness
• Stainless on tank/pressure vessel work
• Anywhere you need to weld for long stretches without worrying about overheating

The WP-26 also comes in a flex-head version, which lets you bend the neck up to ~45° to reach awkward angles. If you do a lot of pipe or in-situ repair work, the flex head is a game-changer.

Buy WP-26 if: you weld 4+ hours a day, you don't have water cooling, and you want one torch that handles 90% of jobs.

👉 Shop our TIG Torch Head WP-26 (Standard, Flex, Head Only, or Assembly)

WP-18 — The Water-Cooled Beast

The WP-18 is a different animal entirely. It runs water-cooled at 350 amps with a 100% duty cycle, meaning you can weld continuously without ever stopping. That's production-shop and automation territory.

The catch: you need a water cooler. A standalone water cooler unit costs $400-800, plus coolant lines and a flow switch. Most pro shops already have one because they have multiple machines; for a one-machine hobbyist, the math usually doesn't work.

WP-18 use cases:

• Production welding (same part, all day, every day)
• Heavy aluminum (3/8"+ with high amperage AC)
• Stainless on thicker pipe and structural components
• Automated TIG cells and orbital welding

The body is also smaller in profile than the WP-26 (because it doesn't need air-cooling mass), so it can actually be more nimble than its big-brother amperage rating suggests — once you get used to dragging a coolant hose.

Like the WP-26, WP-18 comes in flex-head versions for awkward access angles.

Buy WP-18 if: you have water cooling already, you're doing serious production work, or you're welding aluminum thicker than 1/4" regularly.

👉 Shop our TIG Torch Head WP-18 (Standard, Flex, Head Only, or Assembly)

What About Consumables?

Here's the good news: WP-17, WP-18, and WP-26 share most of the same consumables. The standard collet bodies, collets, ceramic cups (alumina nozzles), and back caps are interchangeable across all three series — there are minor variations in "long" versions and gas lens setups, but the core parts cross over.

That means once you buy into the WP-series ecosystem, your tungsten, collets, and cups all work across whichever head you pick. No need to keep three separate parts bins.

Stock up on:

• 👉 Copper Collets (10-Pack) — Standard and Heavy-Duty in 1.6mm to 3.2mm
• 👉 Ceramic Nozzles (10-Pack) — sizes #4 to #8, Long and Standard versions

Decision Framework: Which One Should You Buy?

Cut the spec-sheet noise — here's the simple decision:

If you're...	Buy this
A hobbyist welding under 1/8" material	WP-17
A pro fab shop without water cooling	WP-26 (Standard or Flex)
A production shop with water cooling	WP-18 (Standard or Flex)
Doing pipe/odd-angle work	Always go Flex version
Replacing a worn-out head and have spare consumables	"Head Only" — saves money
Building a complete torch from scratch	"Assembly with Collet Kit" — ready to weld

Bottom Line

WP-17 for hobby. WP-26 for daily pro work. WP-18 when you've got water cooling and need production capacity. The consumables cross over, so getting your first torch wrong isn't catastrophic — you can swap heads later without throwing out your collet drawer.

Still not sure which one fits your machine? Email support@janexusprime.com with your welder's model + amperage and we'll point you to the right head.