The Plasma Process Itself

Plasma cutting uses a high-temperature, high-velocity jet of ionized gas, called plasma, to melt through electrically conductive metal and blow the molten material away. An electric arc forms between an electrode in the torch and the workpiece, which ionizes the gas flowing through the nozzle. This is the same basic process whether a person is holding the torch or a machine is.

What changes with automation isn’t the physics of the cut. It’s the consistency of everything that affects the cut: torch angle, travel speed, standoff distance from the plate, and how precisely the path follows the intended shape.

The Cobot’s Role

The cobot arm holds the plasma torch and moves it along a programmed path. Cobots are designed to work near people, but safeguarding always depends on the complete application, and your integrator must assess the installation and specify the protective measures. Cobots can also be repositioned relatively easily, which matters for shops that don’t have a fixed layout dedicated to cutting.

Precision here comes from the robot arm itself. Universal Robots publishes pose repeatability specs of ±0.08 mm for the UR8 Long and ±0.05 mm for the UR12e, the two models most commonly used for cobot plasma cutting, meaning the arm returns to the same point within a fraction of a millimeter, cut after cut.

The cobot doesn’t decide anything about the cut on its own. It follows the path and parameters set by the software layer, which is where most of the actual “how easy is this to use” question gets decided.

The Software Layer

This is where systems differ the most, and it’s the part that determines whether cobot plasma cutting is practical for a shop without dedicated robotics staff. A few core pieces, using SmoothCut as an example of how this typically works:

• Cut parameter lookup. Instead of an operator manually looking up or guessing cut height, kerf compensation, and speed, the software pulls these directly from certified cut charts for the plasma system in use, based on material and thickness. This removes a common source of manual entry error.
• Path definition. For simple, repeated shapes like circles and rectangles, the operator enters dimensions directly rather than programming a path by hand. For pipes, tubes, curved or formed sheet metal, or other custom shapes, the operator can physically guide the torch mount around the part to teach the path, with the software recording it.
• Real-time compensation. Plate isn’t always perfectly flat. Software that continuously monitors arc voltage can adjust the torch’s standoff height on the fly to keep the cut consistent even across an uneven surface.
• Bevel handling. For cuts that need a weld-ready bevel rather than a square edge, the software can produce that automatically based on material, thickness, and the angle needed, using the correct consumable cartridge for the job.

Why Cobot Plasma Cutting Matters for Cut Quality

Two cuts on the same plasma system, with the same consumables, can look meaningfully different depending on torch angle, speed, and standoff distance. A manual operator manages all three by feel, which takes real skill and still varies day to day. Automating the path and the parameter lookup is what makes the cut repeatable, not just precise on a single attempt.

Where This Fits in a Shop

A cobot set up for plasma cutting can either be dedicated to cutting, or shared with welding on the same station if the underlying software supports both processes. In Smooth Robotics’ case, SmoothTool handles welding and SmoothCut handles plasma cutting, both programmed through the same flange and pendant, which is what lets a single cobot switch between the two without an operator learning a second system.

One Honest Caveat: The Shop Floor Environment

Plasma cutting produces dust, sparks, and vibration, and it’s worth mounting the cobot securely on a stable surface and following the same fume extraction and shielding practices used for manual plasma cutting. None of this is unique to automation, the same hazards exist whether a person or a cobot is holding the torch, but it’s a real setup consideration rather than something that disappears just because the process is automated.

For the broader picture of what cobot plasma cutting is and why shops adopt it, see our cobot plasma cutting guide. If you’re weighing the cost of automating cutting against what your shop currently spends on manual work, see our cost and ROI breakdown.

FAQ

What Is Cobot Plasma Cutting?

Cobot plasma cutting is plasma cutting performed by a collaborative robot, or cobot, instead of a person holding a torch or a fixed CNC table. A plasma torch is mounted to the cobot’s arm, and software controls the path, speed, and cutting parameters, producing a repeatable, precise cut without a human guiding the torch by hand. Unlike traditional industrial robots, cobots are designed to work safely alongside people. They often need less dedicated footprint than older robotic systems, and safeguarding depends on the complete application: your integrator must assess the installation and specify the protective measures. The smaller footprint is a big part of why they’ve become practical for small and mid-sized fabrication shops rather than just large manufacturers.

How It Differs From Manual and CNC Cutting

Manual plasma cutting relies entirely on the operator’s hand and eye. It’s flexible and requires no setup, but accuracy and edge quality vary from cut to cut and from person to person, and it takes an experienced operator to do it well consistently.

CNC plasma cutting automates the cut using a fixed table and a preprogrammed path, usually from a CAD file. It’s very precise for flat, repetitive work, but the part has to come to the machine, and the table itself takes up a fixed footprint in the shop.

Cobot plasma cutting sits between the two. It automates the cut like a CNC system does, but the cobot can be moved to the part, or the part fixtured around the cobot, which makes it a better fit for pipes, tubes, curved or formed sheet metal, and other non-flat geometry a CNC table physically can’t cut, or for shops that don’t have the volume or space to justify a dedicated CNC table. For a closer look at how a cobot actually produces a cut, see our guide on how cobot plasma cutting works.

Why Shops Are Adopting It

The most common reason isn’t really about the cutting itself. It’s about where the people doing the cutting come from. In most fabrication shops, the people skilled enough to do good manual cutting and weld prep are the same people who should be welding. Every hour spent hand-cutting bevels or cleaning up rough edges is an hour not spent on the welding work that actually needs that skill.

Automating the cutting step doesn’t just speed up the cut. It frees up the people who were doing it, and it removes the variation that comes from cutting quality depending on who’s holding the torch that day. It also means those skilled people spend their time on the welding work that actually needs their judgment, rather than on cutting and prep that a cobot can handle just as consistently, shift after shift.

What a Cobot Plasma Cutting Setup Can Do

A cobot plasma cutting system, like Smooth Robotics’ SmoothCut, typically handles:

• General cutting – straight cuts and profiles, repeated with the same quality on every part.
• Bevel cutting – weld-ready bevels produced by selecting material, thickness, and angle, rather than grinding a bevel by hand.
• Repetitive shapes – circles, rectangles, slots, and holes cut by entering dimensions, useful for parts that need the same cutout again and again.
• Custom geometry – shapes taught directly on the workpiece for one-off parts, pipes, tubes, or curved and formed sheet metal that doesn’t fit a standard shape, with a 3D view that lets you inspect the lead-in and lead-out on the cut path before you cut.
• Consistent cut quality on uneven material – automatic torch height compensation keeps the cut clean even when the plate isn’t perfectly flat.
• Cut Chart Integration – pulls cut height, kerf compensation, and speed directly from certified cut charts, using Hypertherm’s single-piece SmartSYNC cartridges, which identify themselves automatically so the correct settings are always in use. No manual lookup, no entry errors.

Full breakdown of these features in our product overview.

What Hardware Does Cobot Plasma Cutting Run On?

A cobot plasma cutting setup is really two pieces of hardware working together: the collaborative robot arm, and the plasma cutting system it’s paired with. Knowing both before you start evaluating vendors saves a step later.

SmoothCut runs on Universal Robots cobots, paired with Hypertherm’s Powermax SYNC plasma systems (45, 65, 85, and 105 amperage models), using SmartSYNC cartridges that identify themselves automatically to the system. The UR8 Long and UR12e are the most common choices, and the right fit for most projects. Smaller UR models can make sense too, depending on the job, especially if you’re bringing the cobot to the workpiece rather than the other way around: a smaller, lighter cobot is easier to carry and reposition than the larger models. If your shop already owns a UR cobot, or already runs Hypertherm Powermax equipment, that’s a real head start on fit.

Are There Ongoing Consumable Costs to Plan For?

Yes, and it’s worth planning for honestly rather than glossing over. Like any plasma cutting system, cartridges wear and need replacing over the life of the machine. SmoothCut uses Hypertherm’s singlepiece SmartSYNC cartridges, which the system reads automatically, so at least the risk of running the wrong cartridge for the job, and wasting one in the process, is designed out.

Standalone, or Added to an Existing Welding Cobot

Cobot plasma cutting doesn’t have to be a separate investment from cobot welding. Some shops adopt it standalone, purely to automate cutting. Others already run a cobot for welding and add cutting to the same machine, using the same programming interface for both. Smooth Robotics’ Helsinki Shipyard installation is a real example of this: the shipyard cuts and welds on the same UR12e station, switching torches without moving the part between machines.

Where Cobot Plasma Cutting Isn’t the Right Fit

To be upfront: cobot plasma cutting isn’t the better choice for every shop. If you’re running high-volume, purely flat-sheet cutting from CAD files, a dedicated CNC plasma table is still generally faster and more efficient at that specific job, that’s genuinely what CNC tables are built for. Cobot plasma cutting earns its place in shops with more varied part geometry, lower or mixed cutting volume, or a need to combine cutting with welding on the same station, not as a universal replacement for every cutting method.

See our cobot vs. CNC comparison for a fuller breakdown of where each one wins.

Is Cobot Plasma Cutting Worth It?

That depends mostly on how much manual cutting and weld prep time your shop is currently absorbing, and what that time is worth relative to the cost of automating it. We cover this in detail, including what a real ROI calculation looks like, in our guide to cobot plasma cutting cost and ROI. If you’re comparing cobot cutting specifically against a CNC table, see our cobot vs. CNC plasma cutting comparison.

FAQ

The Challenge

Welding calls for precision at every step. Seam position shifts part to part, arc parameters need to respond in real time, and getting robot, weld process, and control software working together takes time. On the earlier UR platform, connecting SmoothTool to cameras, seam trackers, and welding power sources meant working within bandwidth and compute limits that predated advanced welding use cases. Integrators and end users still got reliable results, however Gen 7 makes getting there simpler and faster.

The Solution

Gen 7’s extra compute is what changes things for SmoothTool. The CB7 Core controller gives SmoothTool more processing headroom to run heavier arc-control logic without competing for cycle time, and PolyScope X’s open APIs let us build and update SmoothTool’s edge-AI features natively on the platform rather than working around it. The result is a weld control experience that feels built into the robot and not just layered on top of it.

Moreover, SmoothTool is designed with full functionality using the SP7 Smart Panel, which guarantees shorter deployment times and faster implementation into the production flow.

What This Means on the Floor

• More headroom to run heavier welding routines without impacting cycle time

• A programming and teaching experience through the SP7 Smart Panel and TP7 Core pendant that matches the precision and flexibility required for welding applications

• Runs on a platform independently certified to ISO 10218-1:2025 for robot safety and IEC 62443-4-1 ML3 for secure software development, giving SmoothTool a rigorously vetted foundation to build on

That shift in what’s possible is something we feel directly on the Smooth Robotics team:

“Gen 7 of Universal Robots elevates the field of cobot welding to a whole new level. With SmoothTool for PolyScope X we are able to enhance the welder’s experience with fully native software that is built around what the welder actually expects from a welding automated tool.”

– Lucy Lehocka, Customer Success & Marketing Manager, Smooth Robotics

Universal Robots Gen 7

Universal Robots (UR), the original collaborative industrial robot manufacturer and part of Teradyne Robotics, introduced Gen 7, its seventh-generation robotics platform anchored by the PolyScope X robot operating system. Built for the next generation of automation, Gen 7 expands connectivity between robots, software, sensors, vision systems and end effectors, helping manufacturers deploy more capable applications with less integration effort.

Redesigned from tool flange to controller, the new Gen 7 robot platform is AI-ready by design, giving manufacturers unrivaled compute, connectivity and open architecture to deploy AI models directly on production robots without a performance trade-off.

Key innovations in Gen 7

• New g-Series robot arms: UR10g-1750, UR17g-1300, and UR18g-950, joining the e-Series and UR Series lineup.
• AI-ready tool flange: Delivers data, high-power and safety directly to the tool flange, making it easier to connect cameras, sensors, grippers and other peripherals while reducing cabling complexity.
• New SP7 Smart Panel, for teaching and programming directly at the tool flange.
• CB7 Core controller: 40% more compute in a 30% smaller footprint, enabling multi-network communication with PLCs, HMIs, MES platforms, IPCs, and vision systems while reducing the need for external switches.
• PolyScope X software platform: Brings modern programming tools with open APIs for building and deploying edge-AI applications using IPCs and external AI processing, along with ISO 10218-1:2025 safety functionality and cybersecurity compliance.
• Redesigned TP7 Core teach pendant for improved ergonomics and faster programming.
• Built-in safety and cybersecurity: All g-Series robots are TÜV certified to ISO 10218-1 and UL1740, while Teradyne Robotics is certified to IEC 62443-4-1 ML3 for secure software development practices

Ecosystem

Gen 7 is backed by the UR+ ecosystem, a curated, rigorously tested portfolio of automation products, each validated by UR before reaching market.

“What our partners are doing is exactly the kind of proof point that demonstrates the formative power of UR´s open platform and quality ecosystem. They are taking advantage of the advanced connectivity features on our Gen 7’s platform and build on it to provide easy-to-integrate products that run on the floor today.”

– Susanne Nördinger, Head of Ecosystem Success EMEA

Less Setup, More Welding

For shops evaluating a move to Gen 7, SmoothTool for PolyScope X means the weld control they already trust comes with them, running on hardware built to support it rather than constrain it. Less integration overhead translates directly into faster commissioning and less downtime spent troubleshooting connections instead of welding.

See SmoothTool for PolyScope X in person at IMTS 2026 in Chicago, September 14-19 or Contact Us to Learn More about SmoothTool X capabilities.

ABOUT SMOOTH ROBOTICS

Smooth Robotics ApS is a Denmark-based automation software company building weld and cut control solutions for Universal Robots cobots. Its flagship products, SmoothTool and SmoothCut, bring seam tracking, arc control, and process intelligence to collaborative welding and plasma cutting applications, helping manufacturers get more capable automation onto the floor with less integration effort. Smooth Robotics is a member of the UR+ ecosystem. For more information, please visit smooth-robotics.com.

ABOUT UNIVERSAL ROBOTS

Universal Robots is a global leader in collaborative industrial robots (cobots). With over 100,000 cobots sold worldwide, the company’s user-friendly platform is supported by intuitive PolyScope software, award-winning training, comprehensive services, and the world’s best cobot ecosystem, delivering innovation and choice to customers across a wide range of industries. With the most advanced robots in their class and a growing catalogue of ready-to-deploy AI applications, UR’s latest technology is built for the physical AI revolution. 
  
Universal Robots is part of Teradyne Robotics, a division of Teradyne (NASDAQ:TER), a leading supplier of automated test equipment and advanced robotics systems. For more information, please visit www.universal-robots.com. For media enquiries, contact PR@universal-robots.com. 

In welding operations, even small errors can quickly become expensive. Rework, scrap metal, and wasted consumables all add up. This is where collaborative robots (cobots) can make a tangible difference.

Solutions such as SmoothTool, the cobot welding software developed by Smooth Robotics, further support this process by making it easier for operators to program precise and repeatable weld paths. The software simplifies complex welding programming and helps teams maintain consistent weld quality, reducing the risk of errors that lead to scrap and rework.

Reducing waste where it matters most

One of the biggest challenges in welding is maintaining consistent quality over long production runs. Human welders bring valuable expertise, but fatigue, repetitive work, and complex weld paths can lead to variation and errors. 

Collaborative robots help address this challenge by delivering high precision and repeatability. Once programmed, a cobot can execute the same weld path consistently, reducing the likelihood of defects that lead to scrap metal or costly rework.

For manufacturers, this translates into a direct operational benefit:

• Less wasted material 
• Fewer rejected parts 
• Lower costs related to rework and consumables 

According to insights shared by Universal Robots, reducing material waste through precision and repeatability is one of the key ways cobots support more efficient manufacturing processes.

Improving Welding Operations 

Robotic welding has long been associated with improved production efficiency. With cobots, this capability becomes more accessible, particularly for small and medium-sized manufacturers.

By automating repetitive welding tasks, cobots help stabilize production output and maintain consistent quality across batches. A A recent academic research in MDPI Sustainability Academic on robotic welding stations also shows that optimized robot programming and motion paths can significantly improve process efficiency while reducing unnecessary rework and material waste.

Instead of replacing welders, cobots typically take over the most repetitive and physically demanding tasks, allowing skilled operators to focus on programming, quality control, and supervision.

Tools like SmoothTool enable welders to quickly generate advanced welding paths through an intuitive interface, without requiring deep robot programming expertise. This approach allows manufacturers to automate repetitive welds faster while maintaining high precision and productivity.

A practical approach to Sustainability 

In many cases, sustainability in manufacturing does not come from a single breakthrough technology. Instead, it comes from incremental improvements that reduce waste and improve efficiency across the production process.

In welding operations, collaborative robots contribute to this progress by helping manufacturers: 

• Reduce scrap metal and material waste 
• Minimize costly rework 
• Improve process consistency
• Support safer and more sustainable working conditions for welders 

By focusing on waste reduction and operational efficiency, cobots demonstrate how sustainability can move from an abstract concept to a practical advantage on the shop floor.

Chicago, IL – September 8, 2025 — At this year’s FABTECH trade show in Chicago, Universal Robots (UR) has officially launched the UR8 Long, a new collaborative robot (cobot) designed with welding applications in mind. With a 1750 mm reach and 8 kg payload, the UR8 Long offers a unique combination of extended reach, compact footprint, and precision motion control, making it ideal for tasks such as welding, pick-and-place, and quality inspection 

The UR8 Long is part of UR’s latest generation of cobots, which aim to deliver unparalleled performance and adaptability across industries. Its advanced joint architecture and accurate torque control enable high-speed acceleration and precise linear motion—key features for modern welding operations.

One of the most enthusiastic voices about the new cobot comes from Smooth Robotics, a Danish company specializing in welding automation software. Their flagship product, SmoothTool, is a user-friendly cobot welding package that simplifies the programming of advanced welds. It includes features like Touch Sense, Weaving patterns, Multipass, and the newly introduced Seam Tracking, which allows welders to auto-adjust paths through the arc for longer, more consistent welds 

Erik Mønster, CEO of Smooth Robotics, shared his excitement:

“We’re very excited about the new UR8 Long and happy that Universal Robots has listened to feedback from the market and delivered a welding-specific cobot.

The UR10e and UR20 are still great robots for welding, but the UR20’s 20 kg payload is total overkill for most welding tasks. With the UR8 Long, we get the same reach as the UR20 but at a lower cost due to the reduced payload.

We believe many of our customers will opt for this new cobot—it perfectly complements the features of SmoothTool.”

Mønster also highlighted improvements in freedrive functionality, which allows welders to guide the robot manually using SmoothTool’s programming flange. “The freedrive on the UR8 Long feels smoother than on the UR20, and the extended reach enables longer welds, which pairs beautifully with our Seam Tracking feature,” he added.

Smooth Robotics has actually also played a minor role in the development and launch of the UR8 Long, assisting Universal Robots with welding-specific testing and collaborating with their marketing team to ensure the cobot meets the needs of real-world welding professionals.

With over 100,000 UR cobots already deployed globally, the UR8 Long marks a significant step forward in collaborative automation—especially for industries facing a shortage of skilled welders. By combining UR’s hardware innovation with Smooth Robotics’ software expertise, manufacturers now have a powerful, cost-effective solution to scale their welding operations with precision and ease.

Get the data sheet for the new UR8 Long here