Lincoln Flextec 350X Construction Multi Process Welder (Tweco) - K4271-2

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The Flextec 350X Construction model with Tweco style output connectors is the perfect portable power source for field welding applications. Being a multi-process power source, the Flextec is capable of 350A for Stick, TIG and carbon arc gouging. CrossLinc Technology enables remote control over the welding output using the standard weld cables and a CrossLinc accessory. This reduces clutter on the jobsite as well as setup and maintenance time since there is no additional control cable needed. When paired with an LN-25X, the system is the perfect portable field wire welding solution.


  • CrossLinc technology - Full functionality without control cables
  • Recommended for use with an LN-25X CrossLinc portable feeder
  • Simple - Streamlined operator panel minimizes setup time
  • Reliable - Components designed to run cool for long life in high temperature environments
  • Tweco style welding output connections
  • Supports CrossLinc and Across-the-Arc wire feeders

What's Included

  • 8.5 ft (2.6m) input power cord
    • Flextec® 350X Empty 4-Pack Rack | K3400-2


Product Weights & Dimensions

Dimensions (H x W x D) 17 in x 13.5 in x 27 in (432 mm x 343 mm x 586 mm)
Net Weight 74 lbs (33.5 kg)


Machines Processes Stick (SMAW)
Flux-Cored (FCAW)
Flux-Cored Self-Shielded (FCAW-S)
Flux-Cored Gas-Shielded (FCAW-G)
Max Rating 425A
Output Range by Mode 5-425A
Rated Gouging Carbon Diameter 1/4 in (6.5 mm)
Data Technologies USB
Machines Communication Technology CrossLinc
Amphenol Pins (type of connector) 12
Work Lead Connector Type Tweco

Basic Specification

Input Voltage 380-575/3/50/60
Input Current 21/23/23, 25/28/22
Input Power 380/460/575/3/50/60
Output Range 5-425A
Rated Output 350A/34V/60%,300A/32V/100%


Typical Application Cross Country Pipeline
Construction & Field Erection
General Fabrication
Heavy Equipment
Heavy Fabrication
Structural Fabrication


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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