Reviewed 3 November 2026 using supplier listings and used-equipment offers. Western manufacturers quote PTA systems on request, so every price below is labelled by type.
A PTA (plasma transferred arc) welding machine melts metal powder into a plasma arc to lay down a dense, wear-resistant overlay, the process used to hardface engine valves, valve seats and wear parts for oil and gas, mining and power generation. Prices run from a few thousand dollars for an old used system to more than $100,000 for an automated engine-valve cell. What decides the price is not the amperage but the job: a hand-held repair torch, a bench system with a positioner, or a dedicated production cell.
What kind of PTA system the price buys
| Type | Examples | Price seen | Price type |
|---|---|---|---|
| Hand-held or manual torch system | Kennametal Stellite MicroStar; Castolin Eutectic GAP 3511 DC (manual or semi-automated) | Quotation required | Not publicly disclosed |
| General hardfacing machine, CNC | Chinese supplier, 10 kg powder hopper | $5,000 to $50,000 | Supplier asking range |
| Versatile production system | Kennametal Starweld 400, built 2019 | €60,900, ex-works as is | Used-equipment offer, USA |
| Automated engine-valve cell | Chinese automatic PTA for engine valves | $65,000 FOB | Supplier asking price |
| Valve and engine-valve systems | Chinese PTA powder welding equipment, 380V | $55,000 to $150,000; some models $100,000 to $110,000 FOB | Supplier asking ranges |
| Older used system | Hobart PTA, mid-1990s, torch, oscillator, two powder feeders | $2,500 or best offer | Used listing, USA |
The gap between a $5,000 listing and a $110,000 one is mostly automation and fixturing. A production cell includes the positioner or rotary table, oscillation, powder feeders, water cooling and a controller that repeats the same overlay on every part. A manual system leaves those to the operator. Kennametal Stellite, which describes itself as a leader in PTA hardfacing, sells separate lines for these jobs: MicroStar for hand-held work, Starweld 400 as a general-purpose system and ValveStar for automated engine-valve hardfacing.
Where PTA sits on cost
WIKA, which uses Stellite overlays on industrial thermowells, rates the main overlay processes by cost and typical thickness: laser cladding as the most expensive, able to exceed 3.2 mm; PTA in the middle, with 1.6 mm as its standard layer; and plasma spraying as the cheapest, below 1.6 mm. That is one manufacturer’s comparison, but it matches why buyers choose PTA: a fully fused, thick overlay at less than laser cost.
Thick deposits bring their own questions. In an Eng-Tips thread, a materials engineer planning a 20 mm Stellite 6 overlay on mild steel by PTA named cracking as the main concern. Overlay thickness, preheat and procedure qualification affect what a machine must do, so describe the part, alloy and target thickness in any quotation request.
Running costs to budget
The machine is the smaller part of a PTA operation over time. Budget for powder (cobalt, nickel and tungsten carbide alloys are sold by the kilogram and priced on quotation), argon for plasma, shielding and powder transport, tungsten electrodes and nozzles, a chiller or water-cooling loop, and fume extraction. Supplier specifications give a sense of scale: one Chinese listing claims a powder feed of up to 50 g per minute and more than 90 percent powder efficiency; treat those as the seller’s figures until you see a test weld.
Power matters for imports. One of the Chinese valve systems above is listed for a 380V supply; confirm the voltage and phase against your plant before ordering, along with the HS code and import duty for your country.
Prices by country
| Country | Price found | Basis |
|---|---|---|
| China | $5,000 to $150,000 | Supplier asking prices, mostly FOB |
| United States | $2,500 (1990s used); €60,900 (2019 used Starweld 400) | Used listings; new systems quoted on request |
| India | ₹5,00,000 | Single manufacturer listing |
| UK, UAE, Pakistan, Bangladesh, Nigeria, Philippines | Not publicly disclosed | Quotation required |
The Indian figure is one listing that also describes the machine for metal cutting, which PTA welding is not; confirm the specification directly with the maker.
What to send suppliers
- The part: material, size, weight and a drawing of the area to be overlaid.
- The alloy (for example a cobalt or nickel grade, or tungsten carbide blend) and target overlay thickness and hardness.
- Parts per shift, and whether you need manual, semi-automatic or fully automatic operation.
- What is included: power source, torch, powder feeders, positioner, oscillator, chiller, controller, extraction.
- Electrical supply, gas requirements and floor space.
- A test weld on your material, with the parameters and hardness results.
- Installation, training, warranty, spare torch parts and their lead time, and price basis (ex-works, FOB, delivered).
For other ways of treating metal surfaces, see our laser cleaning machine prices, and for how options move the price of shop equipment, our 5-axis CNC price guide.
Questions buyers ask
Is PTA the same as plasma cutting or plasma spraying? No. PTA welds a fused overlay using powder; plasma cutting removes metal, and plasma spraying deposits a coating without fully fusing it to the base.
Can a used system make sense? For a repair shop, possibly; a 1990s system has been listed for $2,500. Check that torch parts, powder feeders and controls are still supported before buying.
Why do Western makers not list prices? PTA systems are configured to the part and the alloy, so Kennametal Stellite, Castolin Eutectic and others quote each system. Ask at least two for a quotation built on the same part drawing.
How we priced this
Chinese prices are supplier asking prices on Alibaba and Made-in-China; used prices are individual listings; Western systems had no public price. Prices are recorded by hand with the date in the chart below and kept separate by type.
| Tracked listing | Configuration | Latest price | Previous price |
|---|---|---|---|
| Chinese PTA powder welding system for valves (low end of $55,000-$150,000) | Asking price, recorded by hand Nov 3, 2026 | $55,000 | No earlier snapshot |
| Chinese automatic PTA machine for engine valves | Asking price, recorded by hand Nov 3, 2026 | $65,000 | No earlier snapshot |
| Chinese PTA machine for engine valves, higher spec | Asking price, recorded by hand Nov 3, 2026 | $100,000 | No earlier snapshot |
| Chinese PTA hardfacing machine (low end of $5,000-$50,000) not in average | Asking price, recorded by hand Nov 3, 2026 | $5,000 | No earlier snapshot |
| Used mid-1990s Hobart PTA system with two powder feeders, US not in average | Asking price, recorded by hand Nov 3, 2026 | $2,500 | No earlier snapshot |
Sources: Kennametal Stellite PTA equipment and WIKA data sheet IN 00.44 on Stellite overlay processes. Supplier listings on Alibaba, Made-in-China and ExportersIndia, used-equipment offers on eBay and Plasticker, Castolin Eutectic product pages and an Eng-Tips discussion were also reviewed.
