Lincoln Flextec 350X Construction Multi Process Welder / LN-25X One Pak - K4278-3

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The Flextec 350X Construction / LN-25X One-Pak system takes full advantage CrossLinc Technology. With the addition of Lincoln's most durable and ergonomic Magnum Pro Curve HDE weld gun, this is the perfect system for wire welding in the field. The One-Pak makes ordering easy using a single part number.


  • Rugged and simple to use. Trayed and potted PC boards. IP23 rated for harsh environments.
  • CrossLinc allows for remote voltage control from the wire feeder at hundreds of feet away with no additional control cables
  • TVT compensates for voltage loss in the system resulting in actual voltage that matches preset voltage
  • Additional weld and work power leads required

What's Included

  • 8.5 ft (2.6m) input power cord
  • Drive Roll Kit .040 - .045 in (1.0 - 1.2 mm) Cored Wire | KP1697-045C
  • Magnum® PRO Curve™ HDE™ 250 Welding Guns | K4531-2-10-45
  • Flextec® 350X Construction (Tweco® ) | K4271-2
  • LN-25X® w/CrossLinc® and TVT (No Flowmeter, Tweco®) | K4267-2



Machines Processes Stick (SMAW)
Gouging (CAC-A)
Flux-Cored (FCAW)
Flux-Cored Self-Shielded (FCAW-S)
Flux-Cored Gas-Shielded (FCAW-G)
Max Rating 425A, 45V
Output Range by Mode 5A to 425A
10V to 45V
Rated Gouging Carbon Diameter 1/4 in (6.5 mm)
Data Technologies USB
Machines Communication Technology analog
Wire Feeder Supply Voltage 40VDC
Amphenol Pins (type of connector) 5
Work Lead Connector Type Tweco

Wire and TIG Feeders

Number of driven rolls 2 rolls
Feeder type Portable
Configuration Single
Max spool diameter 300mm
Communication Technology CrossLinc
UI type Meters
Max Wire Diameter (Solid) 1/16 in (1.6 mm)
Max Wire Diameter (Cored) 3/32 in (2.4 mm)
Max WFS 800IPM
Feedhead Configuration Single
Wire Configuration Single
Power Source to Feeder Communication Connector Type none
Accesories Communication Connector Type none
Gun Bushing Tweco #2-#4
MIG-WireFeeders Yes
Wire Feeders Processes MIG
Flux Cored

Basic Specification

Input Voltage 380-575/3/50/60
Input Current 18/17/17, 26/23/18
Input Power 380/460/575/3/50/60
Output Range 5-425A
Rated Output 350A/34V/60%,300A/32V/100%


Typical Application Construction
Cross Country Pipeline
Construction & Field Erection
General Fabrication
Heavy Equipment
Heavy Fabrication
Maintenance & Repair
Pipeline & Offshore
Power Generation
Structural Fabrication
Structural Welding


Warranty 3 Years


The VRTEX® Mobile simulates the GMAW (short arc, spray, pulse and STT® metal transfers) and FCAW (Self-shielded and Gas-shielded) processes in the standard system.  SMAW (E6010, E6013, and E7018) is an optional hardware and software kit.

SMAW (Optional on VRTEX® Mobile)

  • E6010 (Fleetweld®® 5P+)
  • E7018 (Excalibur® 7018)
  • E6013 (Fleetweld® 37)


  • Short Arc (.035” SuperArc® L-56)
  • Axial Spray (.045” SuperArc® L-56)
  • Pulse (.045” SuperArc® L-56)
  • STT® Surface Tension Transfer® (.045” SuperArc® L-56)


  • Gas-shielded .045 “ (UltraCore® 71A85)
  • Self-Shielded 5/64” (Innershield® NR-232)

The VRTEX® Mobile comes with 3 welding coupons (Flat Plate, Tee Joint, Groove Joint) that can be used in limited positions.

  • Plate: Flat, Horizontal, Vertical and Overhead
  • Pipe: 2G, 5G and 6G
  • The VRTEX® Mobile supports limited positions:
  • Plate: Flat, Horizontal and Vertical
  • Push and drag GMAW techniques
  • Stringer beads
  • Weave techniques – straight, triangle and box weave

Recently released! The VRTEX® has now expanded language support for Portuguese (Brazilian) and Russian.

Input current: 4A @ 115, 2A @ 230

  • The VRTEX® system requires a space of 8’ L x 8’ D x 8’ H (2.4 m x 2.4 m x 2.4 m).
  • When operating multiple units in one location, alternate between standard and alternate frequency systems (unique part numbers are identified).
  • The VRTEX® system is not designed for operation in harsh environments. Recommendations are listed in the instruction manual.
  • Avoid magnetic fields, conductive and high frequency objects and processes.
  • An uninterruptible power supply (UPS) may be required for protection of the system from power irregularities and/or disruptions
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