The Flextec 350X PowerConnect is capable of supporting multiple welding processes like the other 350X models. It is capable of Stick, TIG, pulsed and CV MIG as well as arc gouging. The PowerConnect model also supports multiple input voltages from 200V up to 600V, single or 3-phase. This gives the power source the ultimate in versatility allowing easy transport from one jobsite to another without ever needing to worry about what input voltage might be available. In addition, PowerConnect can see the incoming voltage and adjust itself as needed. There is no additional need for manually reconnecting for the available input voltage. As with the other Flextecs, CrossLinc Technology is included as a standard feature and can be used with all Lincoln CrossLinc accessories.
Compare to Flextec 350X - K4273-1 - Full 5 Year Factory Warranty
The Flextec 350X PowerConnect represents the pinnacle of welding power source flexibility and convenience for professional contractors and fabricators who work across multiple job sites with varying power configurations. This advanced multi-process welder eliminates the common challenge of power compatibility by automatically detecting and adapting to any available input voltage between 200-600V, whether single-phase or three-phase, at 50 or 60Hz frequencies. This revolutionary PowerConnect technology means welders can focus on their craft rather than worrying about electrical compatibility, making job site transitions seamless and eliminating costly downtime. The unit's sophisticated voltage sensing capability automatically configures internal settings to match the detected power supply, providing consistent welding performance regardless of the electrical environment.
Beyond its exceptional power versatility, the Flextec 350X PowerConnect delivers outstanding welding performance across all major processes including Stick (SMAW), TIG (GTAW), MIG (GMAW), flux-cored (FCAW), pulsed MIG, and carbon arc gouging (CAC-A). The integrated CrossLinc technology provides seamless communication with Lincoln's advanced wire feeders and accessories, enabling precise control and monitoring of welding parameters. Built-in pulse programs optimize performance for carbon steel, stainless steel, metal core, and aluminum applications when paired with Power Feed ArcLink wire feeders. The unit supports multiple feeder types including 14-pin analog feeders, 5-pin ArcLink digital feeders, and CrossLinc feeders, providing maximum flexibility for existing equipment integration. With its compact 84-pound design and proven reliability platform based on field-tested Flextec technology, the 350X PowerConnect offers the perfect combination of portability, versatility, and performance for demanding welding applications in construction, fabrication, pipeline work, and heavy equipment maintenance.
- PowerConnect allows for Automatic connecting to any incoming voltage 200-575VAC, single or three-phase, 50 or 60Hz
- Built-in pulse programs for carbon steel, stainless steel, metal core and aluminum. Requires the use of a Power Feed® ArcLink® wire feeder
- Ultimate process flexibility. Supports MIG, TIG, Stick, FluxCored and Carbon Gouging
- Ultimate feeder flexibility. Supports CrossLinc wire feeders, 14-pin analog wire feeders, 5-pin ArcLink digital wire feeders
- Proven Reliability. Based on the same proven platform as the previous Flextec machines and lab and field tested to perform in extreme environments
- Supports 14-pin and 5-pin (ArcLink) wire feeders as well as CrossLinc and Across-the-Arc
| Dimensions (H x W x D) | 17 in x 13 in x 24 in (432 mm x 330 mm x 609 mm) |
| Net Weight | 84 lbs (38.1 kg) |
| Machines Processes | Stick (SMAW) Gouging (CAC-A) Flux-Cored (FCAW) TIG (GTAW) MIG (GMAW) Pulsed MIG (GMAW-P) |
| Input Voltage | 200-600/1/3/50/60 |
| Input Current | 3 Phase: 350A/34V/60%, 208-220/220-230/380-415/460/575, 45/40/23/19/15 1 Phase: 350A/34V/60%, 380-415/460/575, 39/32/26 1 Phase: 300A/32V/60%, 200-208/220-230, 62/56 |
| Input Hertz | 50/60 |
| Input Phase | 1/3 |
| Input Power | 3 Phase, 200-208/220-230/380-415/460/575 - 50/60 Hz 1 Phase, 380-415/460/575 - 50/60 Hz 1 Phase, 200-208/220-230 - 50/60 Hz |
| Output Range | 3 Phase 200-600V, 5-425A, Max OCV: 80V DC 1 Phase 380-575V, 5-425A, Max OCV: 80V DC 1 Phase 200-230V, 5-350A Max OCV 67V DC |
| Output Range by Mode | 5-425 |
| Machines Communication Technology | analog digital CrossLinc ArcLink |
| Wire Feeder Supply Voltage | 40VDC |
| Amphenol Pins (type of connector) | 5 14 12 |
| Work Lead Connector Type | Tweco |
| Typical Application | Cross Country Pipeline Construction & Field Erection General Fabrication Heavy Equipment Heavy Fabrication Structural Fabrication |
| Warranty | 5 Years |
The Factory Low Hour Demo Flextec 350X Power Connect U4273-1 supports MIG (GMAW) and flux-core (FCAW) welding as primary processes. Multi-process models in this family may also support Stick (SMAW) and DC TIG (GTAW). Check the spec sheet for full process compatibility for your specific unit.
Most Lincoln Electric MIG welders in this class accept .023", .030", and .035" solid wire, and .030"–.045" flux-core wire. Some heavy-duty models accept up to .052" wire. Always refer to the owner's manual for the wire size and drive roll requirements specific to your model.
Duty cycle and output amperage vary by model. Lincoln Electric MIG welders in this range typically offer 100–350+ amps of output. Duty cycle at maximum output is listed in the spec sheet — higher-tier industrial models run at 60–100% duty cycle at rated amperage for continuous production welding.
Input power requirements depend on the specific model. Smaller MIG welders (140–215A class) typically run on single-phase 120V or 240V. Larger industrial machines (260A and above) may require single-phase 240V or three-phase 208/230/460V. Check the spec sheet for the exact input power requirements for your unit.
Yes — this is a factory demo or low-hour unit sourced directly from Lincoln Electric. Units may show light cosmetic wear but are mechanically sound and have been tested before sale. Contact WeldingMart for information on any remaining manufacturer warranty for your specific unit number.
For solid wire MIG welding, a 75% Argon / 25% CO2 (C25) mix is the most common choice for steel. 100% CO2 is also used for cost-sensitive applications. Flux-core wire can be run with or without shielding gas depending on the wire type. TIG welding (if supported) requires 100% Argon. Always confirm gas requirements in the owner's manual.