STR Series Refrigeration Laser Welders
Continuous welding at a 100% duty cycle, rated from -30°C (-22°F) to +60°C (140°F)
2000W: USD $28,000 · 3000W: USD $34,000
Prices include shipping, installation and training. For other power levels, contact us for a quote. Prices are in U.S. dollars. For Canada, the price is calculated in Canadian dollars at the exchange rate when the order is placed. Shipping to Canada is from Toronto, Ontario, and within the USA from Buffalo, New York, or Mount Sterling, Kentucky.
A new generation of dual-loop refrigerant cooling, made for extreme environments
Two series with five models in all. Laser output stays stable between -30°C (-22°F) and +60°C (140°F). Power compensation adaptive correction holds power fluctuation below 1% for as long as the machine is in service.
- Direct cooling by refrigerant in two loops, so the welder runs continuously with no scheduled cooling breaks
- Stable between -30°C (-22°F) and +60°C (140°F), with tests run at -19.9°C (-3.8°F) and 71°C (160°F)
- Rated IPX3 against water and IP5X against dust
- Adaptive power compensation that keeps fluctuation below 1%
- K Series welding torch and all-in-one intelligent control
- Built-in expert library of more than 20 welding process packages
- Very flexible integrated armored cable, 5 m or 10 m long
- Five power levels: 900W, 1200W, 1500W, 2000W and 3000W
What the STR Series is
The STR Series is a new line of handheld fiber laser welders for 2026. It has five models in two families, from 900W to 3000W. Every model is cooled directly by refrigerant in two loops, and every model is rated for a 100% duty cycle.
- STR-LITE S (S30 at 900W, S40 at 1200W): the lighter, smaller welders, built for precise and portable work. Both run on single-phase 220V power.
- STR-MASTER X (X50 at 1500W, X60 at 2000W, X80 at 3000W): the heavy industrial welders, with deeper penetration, for high-volume production. The X80 needs three-phase 380V power.
What makes the cooling different
Refrigerant flows through two separate loops and cools the laser directly. It is the same technology that refrigeration equipment uses. The result is a welder that can keep working at full rated power without stopping to cool down.
Steady output in heat and cold
An air-cooled welder loses much of its power once the ambient temperature rises above 15°C (59°F). The STR keeps its laser output flat everywhere in its operating range, between -30°C and +60°C (-22°F and 140°F).
For welders of 1,500 W to 3,000 W that run for long periods, refrigerant cooling holds the temperature steadier than air cooling does. That protects the laser source and the welding head, and it is what makes the 100% duty cycle possible.
Automatic power compensation
Laser output drops slowly as a laser ages. The STR watches its output power (Po). When Po falls below a preset threshold (Ps), the system raises the output to make up the difference. Fluctuation in laser power is held under 1%, so weld quality stays the same over the service life of the machine. Ascent calls this power compensation adaptive correction.
Protected against water spray and dust
The STR is rated IPX3, so it resists water spray from any direction. It is also rated IP5X, which means it is protected against dust on a working shop floor.
Models and power options
| Model | Laser power | Input voltage | Rated input power | Armored cable (standard) | Dimensions (L x W x H) | Weight |
|---|---|---|---|---|---|---|
| STR-LITE S30 | 900W | Single-phase 220V | 3000W | 5 m | 748 x 412 x 624 mm (29.4" x 16.2" x 24.6") | 54 kg |
| STR-LITE S40 | 1200W | Single-phase 220V | 4000W | 5 m | 748 x 412 x 624 mm (29.4" x 16.2" x 24.6") | 54 kg |
| STR-MASTER X50 | 1500W | Single-phase 220V | 5000W | 5 m | 912 x 420 x 722 mm (35.9" x 16.5" x 28.4") | 75 kg |
| STR-MASTER X60 | 2000W | Single-phase 220V | 6800W | 5 m | 912 x 420 x 722 mm (35.9" x 16.5" x 28.4") | 75 kg |
| STR-MASTER X80 | 3000W | Three-phase 380V | 10500W | 10 m | 987 x 470 x 774 mm (38.9" x 18.5" x 30.5") | 100 kg |
Specifications shared by every model
- Cooling system: dual-loop refrigerant direct cooling
- Input frequency: 50/60 Hz
- Welding speed: 20 to 300 cm/min
- Welding modes: continuous or spot
- Built-in process packages: more than 20
- Operating humidity: 0 to 90%
- Wire diameter on the STR-LITE models: 0.8, 1.0, 1.2 or 1.6 mm (0.031", 0.039", 0.047" or 0.063")
- Wire diameter on the STR-MASTER models: 0.8, 1.0, 1.2, 1.6 or 2.0 mm (0.031", 0.039", 0.047", 0.063" or 0.079")
- Armored cable: other lengths can be ordered
Welding capability by material
| Material | S30 (900W) | S40 (1200W) | X50 (1500W) | X60 (2000W) | X80 (3000W) |
|---|---|---|---|---|---|
| Aluminum | 2 mm (0.079") | 3 mm (0.118") | 4 mm (0.157") | 5 mm (0.197") | 6 mm (0.236") |
| Stainless steel | 3 mm (0.118") | 4 mm (0.157") | 5 mm (0.197") | 6 mm (0.236") | 8 mm (0.315") |
| Carbon steel | 3 mm (0.118") | 4 mm (0.157") | 5 mm (0.197") | 6 mm (0.236") | 10 mm (0.394") |
| Galvanized sheet | 2 mm (0.079") | 3 mm (0.118") | 4 mm (0.157") | 5 mm (0.197") | 7 mm (0.276") |
| Brass | 3 mm (0.118") | 3 mm (0.118") | 4 mm (0.157") | 5 mm (0.197") | 6 mm (0.236") |
| Copper | 0.5 mm (0.020") | 1 mm (0.039") | 2.5 mm (0.098") | 3 mm (0.118") | 4 mm (0.157") |
Operating temperature and duty cycle
- Operating temperature: from -30°C (-22°F) up to +60°C (140°F)
- Storage temperature: from -40°C (-40°F) up to +70°C (158°F)
- The published environmental tests were run in -19.9°C (-3.8°F) cold and in 71°C (160°F) heat.
The 100% duty cycle means the STR can weld continuously. There is no timed on/off cycle and no scheduled stop to cool down. This holds at each model's rated power, anywhere in the operating range, with the built-in dual-loop refrigerant cooling doing the work. The 100% figure is a manufacturer specification. No independent third-party test protocol for the duty cycle has been published. Before you buy, confirm the model, the power setting, your ambient conditions and any validation your application requires.
What's included
Every STR model has:
- The K Series welding torch, which is light, precise and comfortable to hold
- All-in-one intelligent control
- A built-in library of more than 20 welding process packages
- A flexible armored cable integrated into the machine: 5 m as standard on the S30, S40, X50 and X60, and 10 m on the X80
The STR-LITE models also have an intelligent safety guard with built-in protections for daily use. Their controls are simple and quick to set up once operators have had qualified operator and laser-safety training.
Laser safety glasses or a laser helmet come with the machine, and we recommend wearing them. Wear welding gloves as well, or buy the special gloves and apron rated above 5000°F. Put laser partitions around the welder. They are available from Ascent Lasers Pro, or you can build your own. See laser safety.
The purchase price also covers:
- Installation at your facility and training for your team
- 2-year comprehensive parts-and-labor warranty
- Software updates at no extra cost
- Lifetime remote diagnostics and help, with AnyDesk remote desktop software pre-installed for fast support and retraining
For the 2000W and 3000W models, shipping is included too. Service technicians work out of Buffalo, Toronto and Kentucky.
Typical applications
- Fabrication and production welding of aluminum, stainless steel, carbon steel, galvanized sheet, brass and copper, within the thicknesses in the capability table.
- Precise, portable welding jobs: the STR-LITE S30 and S40.
- Heavy industrial welding and high-volume production: the STR-MASTER X50, X60 and X80. Their process settings adapt to the material and the joint type.
- Automated and multi-process work on the STR-MASTER X platform: robot welding integration (MASTER X-A), laser cleaning (MASTER X-C) and laser cutting. One laser source platform serves all three. The 1+N Smart Ecosystem allows the automation to be scaled up.
- Shops with extreme temperatures, water spray or dust, within the -30°C to +60°C operating rating and the IPX3 and IP5X ratings.
For the current A-PRO handheld models (1500W, 2000W and 3000W), see refrigeration laser welders. For a quote on an STR model, contact us.