- Heavy-duty output at reconditioned pricing. The Precision TIG 375 is Lincoln's highest-amperage single-phase TIG machine — capable of welding material up to 3/4 in thick on aluminum and 1/2 in on steel. Factory demo pricing puts this flagship capability within reach for production shops that can't justify new-machine capital expenditure.
- 3-year Lincoln factory warranty, no asterisks. The U2624-1 carries the same warranty as a new K-series Precision TIG 375. Lincoln's factory certification means your warranty claims go through the same authorized service network, same response times, same parts availability.
- Complete Ready-PAK — torch, pedal, regulator, and cart included. This listing ships as a fully configured welding station. Receive, uncrate, connect gas and power, weld. No secondary accessory orders required.
| SKU / Model | U2624-1 (Factory Demo Ready-PAK) |
| Output Range | 2–420 A (TIG AC/DC); 2–340 A (Stick, 1-ph configuration) |
| Polarity | AC/DC |
| Input Voltage | 208 / 230 / 460 V, 1-Phase, 60 Hz |
| Input Current | 40% DC: 104/94/47 A (208/230/460 V); 60% DC: 86/78/39 A |
| Duty Cycle | Highest in class — 60% @ 340 A (1-ph, 230 V) |
| Open Circuit Voltage | 75 V max |
| Net Weight | 683 lbs / 309.8 kg (with cart) |
| Dimensions (H×W×D) | 49.7 in × 28 in × 41 in (1262 × 711 × 1041 mm) |
| Warranty | 3 Years — full factory warranty |
| Condition | Factory Demo / Reconditioned — Lincoln Electric certified |
- Precision TIG 375 Power Source
- TIG Torch & Cable Assembly (matched to 375 A output)
- Foot Amptrol with 25 ft cable
- Gas Regulator / Flowmeter
- Gas Hose
- Work Cable & Clamp
- Electrode Holder & Cable
- Accessory Kit (collets, collet bodies, back caps, cups)
- Mobile Undercarriage Cart
At 375 A maximum output, the Precision TIG 375 demands water-cooled or heavy-duty air-cooled torch configurations for extended production runs. WeldingMart stocks:
- Heavy-Duty TIG Torches — PTA-26 and water-cooled 20-series torches rated for 350+ A continuous duty
- TIG Filler Rod — ER4043 & ER5356 aluminum; ER308L, ER316L, ER309L stainless; ER70S-2 & ER80S-D2 carbon/alloy steel
- Dual-Stage Argon Regulators — for consistent high-flow delivery at 420 A aluminum production
- TIG Consumables — 1/8 in and 5/32 in ceriated & lanthanated tungsten electrodes for high-amperage AC aluminum
The Precision TIG 375's 2–420 A range covers the widest material thickness spectrum in the single-phase TIG category:
- Heavy aluminum fabrication. Welding 1/2 in to 3/4 in aluminum plate in a single pass — boat hulls, aerospace structural members, architectural extrusions, and tooling fixtures requiring deep fusion without multi-pass buildup.
- Aerospace & defense production. Micro-Start II Technology enables precision arc starts on thin titanium while the 375 A ceiling handles thick 6061-T6 and 2024-T3 structural components. AC Auto-Balance® optimizes the cleaning-to-penetration ratio automatically for alloys with varying oxide thickness.
- Shipbuilding & marine fabrication. AC/DC capability handles aluminum hull panels, stainless handrails, and chrome-moly pipe fittings from a single power source — essential for yards that can't stock multiple machine types.
- Food & beverage / pharmaceutical equipment. DC TIG at 2–340 A welds thin-wall sanitary tubing (304L, 316L stainless) with radiographic-quality fusion and full-penetration root passes on schedule 40 pipe.
- Maintenance & heavy repair. Highest duty cycle in class means the TIG 375 can sustain production-pace welding without thermal cutouts — critical for fabrication shops running multiple shifts.
Factory demo units are machines built to full production specification, used by Lincoln Electric for authorized demonstrations, and then refurbished at Lincoln's certified facility. Each unit is tested, repaired to factory tolerances, assigned a U-prefix serial number, and released with full factory warranty documentation. They are not "used" in the traditional sense — they have no job-site weld hours.
Yes. The U2624-1 Ready-PAK includes all the components Lincoln ships with the new K2624-1 Ready-PAK — torch, foot amptrol, gas regulator, work lead, electrode holder, accessory kit, and cart. You are not buying a stripped-down demo body.
Duty cycle is the percentage of a 10-minute window the machine can weld continuously before needing to cool. The TIG 375 has the highest duty cycle in its class — 60% at 340 A on 230 V. For production shops running passes on heavy aluminum plate, this means fewer stops, more arc-on time, and higher throughput compared to competing 350 A machines rated at 40% duty.
Mechanically and electrically identical. Factory demo units may show light cosmetic marks from trade show handling. The differences that matter — output range, duty cycle, arc performance, warranty coverage, and feature set — are exactly the same as the new machine.
Yes. The Precision TIG 375 accepts 208 V, 230 V, or 460 V single-phase input, making it compatible with standard shop 240 V service as well as industrial 460 V drops. No transformer required for most commercial installations.
Looking for the brand-new version? See brand-new Precision TIG 375 or browse all Lincoln TIG Welders and our full used TIG welders collection.
The Lincoln Precision TIG 375 Ready-PAK - U2624-1 is a comprehensive TIG welding package engineered to deliver exceptional performance and immediate productivity for professional welding operations. This factory demo unit provides the same robust capabilities and reliability as a new machine, with full factory warranty coverage. The Ready-PAK configuration includes all essential accessories perfectly matched to the Precision TIG 375 power source, creating a complete welding solution that's ready for deployment immediately upon delivery. Featuring the highest duty cycle in its class, this versatile system excels in applications requiring extended welding sessions on thicker materials, while maintaining the precision necessary for delicate work through its impressive 2-420 amp output range.
The Precision TIG 375 Ready-PAK incorporates Lincoln's patented Micro-Start™ II Technology, a sophisticated arc management system that significantly enhances starting characteristics and maintains exceptional arc stability throughout the welding process. This advanced technology enables operators to produce more precise welds and achieve superior crater fills, elevating overall weld quality and appearance. The innovative AC Auto Balance® feature automatically determines the optimal mix of cleaning action and penetration when welding aluminum materials, simplifying the welding process while ensuring excellent results. For applications requiring specific performance characteristics, the system allows operators to manually adjust the AC Balance® to increase or decrease cleaning action or penetration on aluminum based on specific project requirements.
The integrated TIG pulser functionality provides enhanced heat input control, effectively reducing distortion and burn-through on thin materials while allowing for more consistent bead appearance and controlled filler metal deposition. The comprehensive Ready-PAK configuration includes a premium TIG torch with cable assembly, gas regulator, foot pedal, work lead, and all necessary hoses and connections—eliminating the need to source compatible components separately. Thoughtful design elements include side-mounted torch holder and connections that facilitate cable management and provide convenient torch storage when not in use, enhancing workplace organization and protecting valuable components. This complete welding solution represents an exceptional value for professional operations requiring immediate TIG welding capabilities with superior performance characteristics.
- Complete Ready-PAK configuration including matched TIG torch and all essential accessories.
- Industry-leading duty cycle ratings providing superior performance for extended welding sessions.
- Integrated TIG pulser technology minimizing distortion and controlling heat input on thin materials.
- Patented Micro-Start™ II Technology enhancing starting characteristics and arc stability.
- Innovative AC Auto Balance® automatically optimizing cleaning and penetration for aluminum welding.
- Manual AC Balance® adjustment capability for precise control of aluminum welding characteristics.
- Exceptionally wide output range (2-420 amps) handling the broadest material thickness spectrum in its class.
- Practical side-mounted torch holder and connections enhancing cable management and component protection.
- Factory demo unit with full 3-year factory warranty coverage ensuring reliable performance.
| Dimensions (H x W x D) | 49.7 in x 28 in x 41 in (1262 mm x 711 mm x 1041 mm) |
| Net Weight | 683 lbs (309.809 kg) |
| Input Voltage | 208/230/460 |
| Input Current | 40% Duty Cycle: 104/94/47A, 60% Duty Cycle: 86/78/39 |
| Input Hertz | 60 |
| Input Phase | 1 |
| Input Power | 208/230/460/1/60 |
| Mode Icon | CC |
| Output Range | 2-340A Max OCV: 75V |
| Polarity | AC/DC |
| Typical Application | Construction Automotive Brewery Distillery General Fabrication Maintenance & Repair Marine Applications Marine Fabrication & Repair Pharmaceutical Equipment Repair Welding Shipbuilding |
| Warranty | 3 Years |