The Lincoln Flex Lase Handheld Laser Ready-Pak (K5772-1) is Lincoln Electric's complete 2 kW handheld laser welding system — a turnkey package that includes the Flex Lase 20 power source, Flex Feed 25L wire feeder, industrial cart, laser-rated safety equipment, and all accessories needed to start welding on day one. Laser welding has historically required large capital equipment, specialized integration, and extensive operator training. The Flex Lase Ready-Pak changes that: new operators are producing production-quality welds in 30–60 minutes of training, at travel speeds up to 4× faster than traditional handheld TIG.
- 2 kW of laser output power. 200–2,000 W output range covers everything from thin-gauge sheet (18 gauge / 1 mm) to medium plate (8 gauge / 4 mm) on stainless steel, carbon steel, and aluminum. Lincoln-developed preset parameters for stainless steel, carbon steel, aluminum, galvanized steel, and copper eliminate trial-and-error setup on production materials.
- Up to 4× faster travel speed than handheld TIG. Laser welding's focused energy delivery reduces heat input to the base material — less heat spread means less distortion, less fixturing requirement, and faster solidification. The Flex Lase delivers measurably higher throughput on sheet metal assemblies, tube and pipe fabrication, and enclosure welding compared to conventional TIG or MIG.
- Autogenous or wire-fed welding. The toggle switch on the Flex Lase gun switches between autogenous (fusion, no filler) and wire-fed welding. Wire-fed mode using the Flex Feed 25L feeder handles gaps, dissimilar material combinations, and joints requiring filler for structural integrity. Wire sizes 0.035" to 1/16" solid wire.
- HyperFill twin-wire capability. The Flex Feed 25L supports Lincoln's HyperFill dual-wire process for higher deposition rates on aluminum and steel — enabling even faster travel speeds on thicker material sections where a single wire can't keep pace with the laser's fusion speed.
- 7" full-color LCD touchscreen, glove-friendly. Anti-glare, large-text interface allows parameter entry and process selection while wearing welding gloves. Up to 32 memory settings store and recall preferred parameters for different material/process combinations.
- Flex Feed 25L — 5-year warranty wire feeder. Based on Lincoln's proven Power Feed 25M platform. Two-gear MAXTRAC wire drive system, internal lighting, and revolutionary split wire guide provide reliable, consistent wire feeding. Lincoln's market-leading 5-year warranty on the feeder reflects the platform's established reliability.
- Visible red guide laser. The guide laser on the Flex Lase gun projects a visible red spot on the workpiece where the laser beam will be focused — allowing precise placement of the weld path before triggering laser output.
- Ships complete — everything included except shielding gas and filler wire. Laser welding gun, power source, wire feeder, industrial cart, 10 spare protective lenses, contact tips, drive rolls, gas filter assembly, gas adapter, laser-rated helmet, and two pairs of laser-rated safety glasses. Same-day or next-day weld capability from delivery.
| SKU / Model | K5772-1 / Flex Lase Handheld Laser Ready-Pak |
| Process | Semiautomatic Laser Welding (autogenous and wire-fed) |
| Laser Type | Class 4 primary laser; Class 2 guide laser (visible red) |
| Input Power | AC 230 V / 1-Phase / 50/60 Hz |
| Input Current | 26 A |
| Laser Output Range | 200–2,000 W (0.2–2.0 kW) |
| Rated Output | 2,000 W |
| Material Thickness Range | 18 gauge (1 mm) to 8 gauge (4 mm) |
| Materials | Stainless steel, carbon steel, aluminum; galvanized and copper (with application engineering support) |
| Wire Size Range | 0.035"–1/16" solid wire (via Flex Feed 25L) |
| Wire Feeder | Flex Feed 25L (based on Power Feed 25M platform) |
| Feeder Warranty | 5 Years |
| Memory Settings | Up to 32 user-defined presets |
| Display | 7" full-color LCD touchscreen, anti-glare, glove-friendly |
| Cart | Industrial laser welding cart with gun holster, cable management, and storage (1-year warranty) |
| System Weight | 246 lbs (111.5 kg) — full Ready-Pak configuration |
| Shipping Dimensions | 53.7" H × 23" W × 45.5" D |
| Power Source Warranty | 2 Years (Flex Lase 20 power source) |
| Activation | Required — register equipment and sign Laser Safety Acknowledgement to receive activation code |
| Condition | New — Lincoln Electric K-prefix (factory-new) |
- Flex Lase 20 Power Source — 2 kW laser power source
- Flex Lase Handheld Laser Welding Gun
- Flex Feed 25L Wire Feeder
- Industrial Laser Welding Cart with gun holster and cable management
- K5750-1 Laser Safety Glasses — 2 pairs
- VIKING FLZ Laser Safe Passive Welding Helmet (K5747-1)
- KP5795-1 Conduit Assembly
- KP2744-045T Contact Tips — 0.045" single wire, 10-pack
- KP1696-1 Drive Roll Kit — 0.035"–0.045" / 0.9–1.2 mm
- Gas Filter Assembly
- Gas Adapter
- KP5819-1 Protective Windows for Flex Lase 20 — 10-pack
- KP5820-1 Focal Lens for Flex Lase 20
- Drive Roll Kit Combination 0.035"/0.045" Solid Wire (KP1696-1)
- Interconnecting cables
- Operator's manual and Laser Safety documentation
Maintain and expand the Flex Lase system's capabilities with Lincoln Electric consumables and optional accessories:
- TIG Filler Wire — While the Flex Lase uses MIG-format solid wire (not cut-length TIG rod), WeldingMart carries stainless steel, carbon steel, and aluminum solid wire compatible with the Flex Feed 25L feeder in 0.035" and 0.045" diameters. ER308L, ER316L for stainless; ER70S-6 for carbon steel; ER4043/ER5356 for aluminum.
- Argon / Argon-Mix Regulators — The Flex Lase requires shielding gas (argon or argon/helium blend depending on material). CGA-580 single-stage flowmeters for shop use; dual-stage regulators for extended production runs where consistent flow pressure is required.
- Protective Optics & Consumables — Spare KP5819-1 protective windows for the laser gun (consumable item, replaced as soiled or damaged), focal lens assemblies, and additional laser-rated safety glasses for facility operators and visitors within the laser-controlled area.
- Upgrade Wire Feeding Accessories — Lincoln Electric's K5913-1 HyperFill 0.035" Wire Feeding Accessory One-Pak and K5914-1 HyperFill 1/16" Aluminum Wire Feeding Accessory One-Pak add twin-wire HyperFill capability to the Flex Feed 25L for higher deposition rate applications.
The Flex Lase system is not a traditional TIG welder — it is a precision handheld laser welding system that serves applications where TIG's heat input and travel speed are limiting production:
- General fabrication — enclosures, cabinets, and brackets. Stainless steel and carbon steel enclosures (electrical panels, food service equipment, HVAC housings) are one of the Flex Lase system's highest-volume applications. Laser welding at 4× TIG travel speed with minimal distortion eliminates most post-weld grinding and straightening. Typical sheet gauge: 18–11 gauge stainless or galvanized. Up to 32 stored presets allow operators to switch between materials and gauges with a single button press.
- Aerospace and defense components. Low heat input and a narrow heat-affected zone (HAZ) make laser welding suitable for aerospace sheet metal assemblies where TIG's HAZ would soften precipitation-hardened alloys or require post-weld heat treatment. Stainless steel brackets, titanium sheet assemblies, and thin-wall tube fabrication are common aerospace applications for handheld laser.
- Automotive and transportation — body panels and structural assemblies. Laser welding's low distortion on thin-gauge steel and aluminum sheet panels eliminates the warping and oil-canning common with MIG and TIG on 18-gauge and thinner automotive body stock. The Flex Lase handles galvanized steel with application engineering support — contact Lincoln Electric's application team for optimized galvanized parameters before production use.
- Stainless steel sanitary and pharmaceutical tubing. The Flex Lase's focused energy and low spatter output are compatible with sanitary welding requirements on 316L stainless tube and fitting fabrication. Laser welds on thin-wall tube produce smooth, low-oxide weld faces that meet sanitary surface finish standards with minimal post-weld polishing, reducing fabrication time vs. TIG on high-volume tube welding lines.
- Jewelry, art metalwork, and precision assembly. At 200 W minimum output, the Flex Lase can reach the low-energy operating point required for fine metalwork and precision assembly on thin-wall components. Artists and custom fabricators have found handheld laser welding transformative for assemblies where TIG torch access is impossible or heat distortion destroys delicate workpieces. The guide laser and variable output make careful, controlled low-heat fusion welding achievable without the operator experience required for micro-TIG.
Lincoln Electric markets the Flex Lase as a next-generation alternative to handheld TIG for precision sheet metal and stainless steel applications. Many customers considering a high-end TIG machine for production shop environments find the Flex Lase's 4× travel speed improvement and minimal operator training curve to be a better fit. We carry it in this collection for customers evaluating the Lincoln Electric professional welding line for precision fabrication work. The Flex Lase cannot be used for applications requiring traditional TIG filler rod, AC TIG on aluminum, or pipe TIG welding — see the Square Wave 205 or Aspect 230 for those applications.
Every Flex Lase 20 power source ships locked. To activate the laser output, the purchaser must register the equipment at Lincoln Electric's website and sign a Laser Safety Acknowledgement confirming that a qualified Laser Safety Officer (LSO) has reviewed and approved the laser-controlled area where the system will be used. Lincoln Electric then issues an activation code. This is a one-time process required only for first-time startup. It ensures operators are aware of the Class 4 laser safety requirements before the system enters service.
Yes, with the right parameters. The Flex Lase 20 includes Lincoln-developed presets for aluminum, stainless steel, and carbon steel. Aluminum welding with the Flex Lase requires the Flex Feed 25L set up with aluminum wire (ER4043 or ER5356, 0.035"–1/16") and argon or argon/helium shielding gas. Lincoln recommends using the K5914-1 HyperFill 1/16" Aluminum Wire Feeding Accessory One-Pak for best results on aluminum at higher deposition rates. Contact Lincoln Electric application engineering for aluminum weld procedure development if running production applications outside the included preset parameters.
The Flex Lase 20 requires AC 230 V, single-phase, 50/60 Hz input. It cannot be run on 120 V. A dedicated 30-amp or larger 230 V circuit is required (input current: 26 A at rated output). The system does not include a 120 V adapter — it is a production shop machine requiring a standard 230 V industrial or workshop outlet (NEMA 6-50 or similar).
Lincoln Electric's documentation states that new operators are executing production-quality welds in 30–60 minutes of training. The consistent focal point, visible guide laser, and preset parameter library eliminate most of the variable-control learning curve present in TIG or MIG welding. Operators don't need to learn arc length control, filler dip technique, or TIG torch manipulation — the system delivers consistent welds as long as the gun tip tracks the joint and the correct preset is selected. Ongoing quality consistency is substantially easier to achieve than with traditional arc welding processes.