The Lincoln Invertec V155-S Factory Demo Stick Welder (U2605-1) is a professional-grade inverter-based DC Stick and Touch Start TIG machine weighing under 15 pounds — purpose-built for welders who need industrial arc quality in a pack-and-go format. This low-hour factory demo unit has been inspected and certified by Lincoln Electric, carrying the full 3-year warranty at a substantially reduced price versus the new K2605-1.
- Inverter DC arc at demo pricing. The V155-S delivers smooth, stable DC output for E6010, E6011, E7018, and specialty rods — the electrode range serious maintenance and pipeline welders depend on. At factory demo price, you get Lincoln inverter technology without the new-machine premium.
- 15-pound portability with professional output. At under 15 lbs and with auto-switching 120V/230V input, the V155-S goes where transformer-based machines can't — confined spaces, remote job sites, pipe racks, or a truck toolbox. The 155A output covers the vast majority of field maintenance and repair electrode applications.
- Bonus Touch Start TIG without extra equipment. Connect a compatible TIG torch and the V155-S provides DC TIG welding on carbon steel, stainless, and alloys — expanding the machine's capability beyond SMAW without buying a second unit.
| Output Processes | Stick (SMAW), Touch Start TIG (GTAW) |
| Output Polarity | DC |
| Amperage Range | 5 – 155 A |
| Open Circuit Voltage (OCV) | DC inverter — high OCV for E6010 arc starts |
| Electrode Size Range (SMAW) | 3/32 in. – 5/32 in. (E6010, E6011, E6013, E7018) |
| Input Voltage / Phase / Hz | 115 V or 230 V / 1-Phase / 50–60 Hz (auto-switching) |
| Input Current | 22.8 A (115V) / 28.8 A (230V) |
| Stick Arc Modes | SOFT and CRISP (operator-selectable) |
| Arc Force | Auto-Adaptive Arc Force (minimizes electrode sticking) |
| Hot Start | Automatic (boosts output current at arc initiation) |
| Cooling | Fan-As-Needed (F.A.N.) |
| Dimensions (H × W × D) | 11.3 in × 6.2 in × 15.4 in (288 × 158 × 392 mm) |
| Net Weight | 14.70 lbs (6.67 kg) |
| Certifications | CE, CSA, CCC |
| Warranty | 3 Years (Lincoln Electric factory warranty) |
- Lincoln Invertec V155-S Stick Welder (factory demo unit, U2605-1)
- Input power cable
- Lincoln Electric operator’s manual
- Factory inspection and certification documentation
Note: Electrode holder, work leads, and TIG torch not included. See accessory links below.
Get the most from your V155-S with these WeldingMart-stocked accessories:
- Stick Welding Electrodes & Rods — The V155-S’s DC output runs E6010 (deep-penetration cellulosic), E6011, E6013, E7018 (low-hydrogen), and stainless rods. Keep an assortment of E6010 and E7018 on hand for the range of maintenance and repair work the V155-S is designed for.
- Welding Leads — Lightweight leads are ideal with the V155-S’s portable form factor. At 155A maximum output, 1/0 cable leads in 25 ft. sets are typical for field work, with 2/0 preferred for longer runs.
- Electrode Holders — A 200A or 300A insulated electrode holder pairs well with the V155-S for maintenance and repair electrode work at 5/32 in. rod maximum.
- DC TIG torch — To use the Touch Start TIG function, connect a compatible air-cooled DC TIG torch (e.g., Lincoln K1751 or equivalent). This unlocks TIG welding capability without any additional power source investment.
- Extension cord (up to 200 ft.) — The V155-S’s auto-input switching and inverter design supports operation on extension cords up to 200 ft. without significant arc degradation — a key field advantage for remote job sites.
The Invertec V155-S was built for professionals and serious hobbyists who need inverter DC stick performance in the field:
- Pipeline and Process Piping. The V155-S’s DC output and E6010 compatibility make it a genuine pipeline machine. Root passes on carbon steel pipe with E6010 and fill/cap with E7018 — the standard two-rod pipeline procedure — are fully within the V155-S’s capability for pipe sizes up to 6 in. diameter.
- Maintenance and Repair Welding. Plant maintenance applications: welding bracket repairs, machinery frame cracks, conveyor idler frames, pump housings, and structural steel repairs where portability matters. The V155-S fits in a 5-gallon bucket if needed.
- Farm and Heavy Equipment Repair. Broken implement frames, cracked bucket teeth, cultivator shanks, and trailer repair — the V155-S handles all standard farm steel repair with E6011 or E7018 for clean structural quality.
- Pharmaceutical and Power Generation. Thin-wall stainless and alloy pipe repair in pharmaceutical or power generation facilities — where the Touch Start TIG function earns its keep on critical material welds requiring precision.
- Vocational and Technical Training. The V155-S’s SOFT/CRISP arc modes and low-weight design make it an ideal training machine for teaching students to develop arc-control skills with both cellulosic and low-hydrogen electrode types.
- Remote Job Sites. The 120V/230V auto-switching input allows operation from a 120V outlet, portable generator, or 230V shop circuit interchangeably — without rewiring the machine. Extension cord compatibility to 200 ft. enables work in confined plant spaces or remote locations.
Yes — this is one of the V155-S’s most important capabilities. E6010 cellulosic electrodes require a DC machine with sufficient OCV to maintain the arc. The V155-S’s inverter DC output is specifically suited for E6010. Use the CRISP arc mode for best E6010 performance. This capability makes the V155-S a viable pipeline root-pass machine.
CRISP mode provides a tight, penetrating arc with higher arc force — optimal for E6010, E6011, and cellulosic electrodes that require arc dig to establish a good root pass or to burn through surface contamination. SOFT mode delivers a smoother, lower-force arc suited for E7018 low-hydrogen electrodes where minimizing spatter and electrode sticking is the priority.
Yes. Lincoln Electric factory demo units are inspected and certified to the same quality standards as new production machines. The U2605-1 carries Lincoln’s full 3-year warranty starting from your purchase date — not from the original factory test date.
Yes — via the Touch Start TIG function. Connect a compatible DC TIG torch to the output terminals and switch to TIG mode. The V155-S provides DC TIG welding on carbon steel, stainless steel, chromoly, and other common alloys. Note: no high-frequency start or pulse mode (those are available on the Sprinter 180Si).
Up to 200 feet, per Lincoln Electric specifications. The V155-S’s inverter design and auto-input voltage switching compensate for voltage drop on longer extension runs better than a transformer-based machine of equivalent amperage. Use properly sized extension cord gauge for your run length.
The K2605-1 is the new-production Lincoln Invertec V155-S. The U2605-1 is a low-hour factory demo version of the same machine — same specifications, same warranty, lower price. Lincoln uses the “U” prefix to designate factory demo/reconditioned units that have been tested and inspected before resale.
Looking for the brand-new version? See the Lincoln Invertec V155-S K2605-1, browse all Lincoln Stick Welders, or view the full demo stick welders collection to compare all available factory demo options.