Lincoln Flextec 350 XP (Tweco) Multi-Process Welder - K4272-2

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The Flextec 350XP model is everything the 350X Construction model is and more. The 350XP model is not only portable and powerful, it is also even more flexible. With standard amphenol connections supporting most Lincoln Electric wire feeders, the Flextec 350XP is capable of supporting most arc welding processes. This new model 350XP now also suports Pulsed MIG welding processes when combined with a supporting Lincoln digital ArcLink wire feeder such as a Power Feed 84.


  • Pulsed MIG modes unlocked when paired with a compatible Arclink capable feeder.
  • Includes CrossLinc Technology
  • Simple - Streamlined operator panel minimizes setup time
  • Flexible - Compatible with across-the-arc, CrossLinc, 14-pin analog and 5-pin digital wire feeders
  • Reliable - Components designed to run cool for long life in high temperature environments
  • Supports 14-pin and 5-pin (ArcLink) wire feeders as well as CrossLinc and Across-the-Arc

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 in x 24 in (432 mm x 330 mm x 609 mm)
Net Weight 82 lbs (37 kg)


Machines Processes Stick (SMAW)
Flux-Cored (FCAW)
Pulsed MIG (GMAW-P)
Flux-Cored Self-Shielded (FCAW-S)
Flux-Cored Gas-Shielded (FCAW-G)
Max Rating 425a
Output Range by Mode 5-425
Rated Gouging Carbon Diameter 1/4 in (6.5 mm)
Data Technologies USB
Machines Communication Technology CrossLinc
Wire Feeder Supply Voltage 40VDC
Amphenol Pins (type of connector) 5
Work Lead Connector Type Tweco

Basic Specification

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


Typical Application Construction
Cross Country Pipeline
Construction & Field Erection
General Fabrication
Heavy Fabrication
Maintenance & Repair
Marine Fabrication & Repair
Oil & Gas
Pipeline & Offshore
Power Generation
Repair Welding
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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