Lincoln Electric Flextec 350X Construction Multiprocess Welder, LN-25X One-Pak
The Lincoln Electric Flextec 350X Construction / LN-25X One-Pak is a field wire welding system under a single part number: the Flextec 350X Construction power source, a portable LN-25X wire feeder and a Magnum PRO Curve HDE gun. CrossLinc technology lets the operator set voltage at the feeder with no control cable, even when it sits hundreds of feet away from the power source.
TVT (True Voltage Technology) makes up for voltage loss in long cable runs, so the voltage at the arc stays at the preset value. The system has trayed and potted PC boards and an IP23 environmental rating, which together guard against dust, moisture and vibration, and the power source carries Desert Duty certification up to 131°F (55°C). The LN-25X has a durable build with protected meters for reading and adjusting settings in field conditions.
Lincoln's Magnum PRO Curve HDE gun is designed for durability and ergonomics, which helps reduce operator fatigue during extended welds. The One-Pak suits wire welding in construction and field erection settings, and the 350X Construction power source also supports stick, TIG and carbon arc gouging when a job calls for them.
Highlights
One-Pak with the Flextec 350X Construction power source, LN-25X feeder and Magnum PRO Curve HDE gun
CrossLinc voltage control from the feeder at hundreds of feet, with no control cable
TVT holds actual voltage at the preset value by compensating for voltage loss
IP23 environmental rating, with trayed and potted PC boards
Portable LN-25X feeder with protected meters for field conditions
Desert Duty certification up to 131°F (55°C)
Specifications
Brand | Lincoln Electric |
Manufacturer part number | K4278-3 |
Power source | Flextec 350X Construction |
Wire feeder | LN-25X portable feeder |
Gun | Magnum PRO Curve HDE |
Remote control | CrossLinc, voltage control from the feeder, no control cable |
Voltage compensation | True Voltage Technology (TVT) |
Circuit boards | Trayed and potted PC boards |
Enclosure rating | IP23 |
Desert Duty | Up to 131°F (55°C) |
What's in the box
Flextec 350X Construction power source
LN-25X portable wire feeder
Magnum PRO Curve HDE welding gun
Good to know
Check the input power (voltage, phase and amperage) against your supply before you order.

